MPLS technology management
LDP configuration
LDP is a tag distribution protocol. To find the neighbors hello messages are sent to the multicast address 224.0.0.2. When exchanging hello messages, routers learn each other's transport addresses. A router with a bigger address initializes the TCP session. After checking the parameters, the LDP session is considered established.
ESR routers support the following LDP operation modes:
- Tag information exchange mode — Downstream Unsolicited;
- Mechanism for controlling the distribution of tags — Independent Label Distribution Control;
- Label retention mode — Liberal Label Retention;
On interfaces where LDP and MPLS switching are enabled, the firewall must be disabled.
The current version LDP only works with IPv4 addresses.
Configuration algorithm
Step | Description | Command | Keys |
|---|---|---|---|
1 | In the context of MPLS parameters configuration, specify the interfaces involved in the MPLS switching process | esr(config-mpls)# forwarding interface { <IF> | <TUN> } | <IF> – an interface's name, specified in the form described in Section Types and naming order of router interfaces; <TUN> – the name of the tunnel is specified as described in section Types and naming order of router tunnels; |
2 | Specify the router-id for LDP (not necessary if transport-address is specified). | esr(config-ldp)# router-id <ID> | <ID> – router identifier, defined as AAA.BBB.CCC.DDD where each part takes values of [0..255]. |
3 | In the context of the address family ipv4 settings, specify transport-address (not necessary if router-id is specified). | esr(config-ldp-af-ipv4)# transport-address <ADDR> | <ADDR> – defined as AAA.BBB.CCC.DDD where each part takes values of [0..255]. |
4 | In the context of the address family ipv4 settings, specify interfaces for enabling LDP process. | esr(config-ldp-af-ipv4)# interface { <IF> | <TUN> } | <IF> – an interface's name, specified in the form described in Section Types and naming order of router interfaces; <TUN> – the name of the tunnel is specified as described in section Types and naming order of router tunnels. |
5 | Enable LDP process. | esr(config-ldp)# enable | |
6 | Enable explicit-null functionality (optional). | esr(config-ldp)# egress-label-type explicit-null | |
7 | In the LDP neighbor configuration mode, set the password with the password command (optional). | esr(config-ldp-neig)# password {<TEXT> | ENCRYPTED-TEXT>} | <CLEAR-TEXT> – password, sets by string of [8..16] characters; <ENCRYPTED-TEXT> – encrypted password of [8..16] bytes ([16..32] characters) in hexadecimal format (0xYYYY...) or (YYYY...). |
The following functionality is also available as part of the LDP configuration:
| |||
If router-id value is changed, then the new value will be applied only after restarting this protocol. To restart mpls ldp, use the clear mpls ldp command.
Configuration example
Objective:
Configure LDP communication between peers.
Solution:
ESR pre-configuration:
First, IP addresses must be assigned to the interfaces, the firewall must be disabled and one of the internal routing protocols must be configured.
ESR pre-configuration:
hostname ESR
router ospf 1
area 0.0.0.0
enable
exit
enable
exit
interface gigabitethernet 1/0/1
ip firewall disable
ip address 10.10.10.1/30
ip ospf instance 1
ip ospf
exit
interface loopback 1
ip address 1.1.1.1/32
ip ospf instance 1
ip ospf
exitESR1 pre-configuration:
hostname ESR1
router ospf 1
area 0.0.0.0
enable
exit
enable
exit
interface gigabitethernet 1/0/1
ip firewall disable
ip address 10.10.10.2/30
ip ospf instance 1
ip ospf
exit
interface loopback 1
ip address 4.4.4.4/32
ip ospf instance 1
ip ospf
exitConfiguration on ESR:
ESR
ESR# config
ESR(config)# mpls
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/1
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 1.1.1.1
ESR(config-ldp)# enable
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1
ESR(config-ldp-af-ipv4-if)# end
ESR#
Configuration on ESR1:
ESR1
ESR1# configure
ESR1(config)# mpls
ESR1(config-mpls)# forwarding interface gigabitethernet 1/0/1
ESR1(config-mpls)# ldp
ESR1(config-ldp)# router-id 4.4.4.4
ESR1(config-ldp)# enable
ESR1(config-ldp)# address-family ipv4
ESR1(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1
ESR1(config-ldp-af-ipv4-if)# end
ESR1#Check:
Enter the following commands at one of the peers:
ESR# show mpls ldp discovery detailed
Local LDP ID: 1.1.1.1
Discovery sources:
Interfaces:
gigabitethernet 1/0/1:
Hello interval: 5 seconds
Transport IP address: 1.1.1.1
LDP ID: 4.4.4.4
Source IP address: 10.10.10.2
Transport IP address: 4.4.4.4
Hold time: 15 seconds
Proposed hold time: 90/15 (local/peer) secondsThe output will show the parameters of the neighboring peer obtained from the multicast hello messages.
The LDP session should be in the 'Operational' state.
ESR1# show mpls ldp neighbor
Peer LDP ID: 4.4.4.4; Local LDP ID 1.1.1.1
State: Operational
TCP connection: 4.4.4.4:40245 - 1.1.1.1:646
Messages sent/received: 10/11
Uptime: 00:00:58
LDP discovery sources:
gigabitethernet 1/0/1Configuring session parameters in LDP
By default, hello messages sent out are set to the following values:
Parameter | LDP |
|---|---|
Hello interval | 5 seconds |
Hold timer | 15 seconds |
Keepalive holdtime | 180 seconds |
Hold timer is a matching parameter — the smallest is chosen. This example shows that the ESR after matching the Hold timer is 10 seconds.
ESR# sh mpls ldp discovery detailed
Local LDP ID: 4.4.4.4
Discovery sources:
Interfaces:
gigabitethernet 1/0/4:
Hello interval: 5 seconds
Transport IP address: 4.4.4.4
LDP ID: 1.1.1.1
Source IP address: 10.10.10.1
Transport IP address: 1.1.1.1
Hold time: 10 seconds
Proposed hold time: 15/10 (local/peer) secondsIf after matching, the Hello interval is greater than the Hold timer, then the Hello interval will be equal to Hold timer/3.
ESR routers have the ability to flexibly configure Hello holdtime, Hello interval and Keepalive holdtime settings.
Example of configuring Hello holdtime for an LDP session:
ESR# show run mpls
mpls
ldp
router-id 4.4.4.4
discovery hello holdtime 40
address-family ipv4
interface gigabitethernet 1/0/4
discovery hello holdtime 60
exit
exit
enable
exitIf the Hello Holdtime and Hello Interval parameters are not specified, the default values are used. If parameters are specified, the priority of values for address-family will be higher than for globally configured values.
ESR# show mpls ldp discovery detailed
Local LDP ID: 4.4.4.4
Discovery sources:
Interfaces:
gigabitethernet 1/0/4:
Hello interval: 5 seconds
Transport IP address: 4.4.4.4
LDP ID: 1.1.1.1
Source IP address: 10.10.10.1
Transport IP address: 1.1.1.1
Hold time: 15 seconds
Proposed hold time: 60 /15 (local/peer) secondsThe parameters configured in address-family can be configured for each individual interface participating in the LDP process.
ESR# show running-config mpls
mpls
ldp
router-id 4.4.4.4
discovery hello holdtime 50
discovery hello interval 10
address-family ipv4
interface gigabitethernet 1/0/1
discovery hello holdtime 60
discovery hello interval 20
exit
interface gigabitethernet 1/0/4
discovery hello holdtime 30
discovery hello interval 10
exit
exit
enable
exitFor a TCP session, Keepalive holdtime is also a matching parameter similar to Hold timer. Keepalive interval is calculated automatically and equals Keepalive holdtime/3. Keepalive holdtime can be set globally as well as for each neighbor. The timer set for a particular neighbor is a higher priority.
ESR# show running-config mpls
mpls
ldp
router-id 4.4.4.4
keepalive 30 // set in the global LDP configuration
neighbor 1.1.1.1
keepalive 55// set to neighbor with the 1.1.1.1 address
exit
exitESR# sh mpls ldp neighbor 1.1.1.1
Peer LDP ID: 1.1.1.1; Local LDP ID 4.4.4.4
State: Operational
TCP connection: 1.1.1.1:646 - 4.4.4.4:56668
Messages sent/received: 401/401
Uptime: 02:00:24
Peer holdtime: 55
Keepalive interval: 18
LDP discovery sources:Algorithm for setting Hello holdtime and Hello interval in the global LDP configuration
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | In the LDP configuration mode, set Hello holdtime. | esr(config-ldp)# discovery hello holdtime <TIME> | <TIME> — Time in seconds in the range of [3..65535]. Default value: 15. |
3 | In the LDP configuration mode, set Hello interval. | esr(config-ldp)# discovery hello interval <TIME> | <TIME> — Time in seconds in the range of [3..65535]. Default value: 5. |
Algorithm for setting Hello holdtime and Hello interval for address family
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | In the LDP address family configuration mode, set Hello holdtime on the specified interface. | esr(config-ldp-af-ipv4-if)# discovery hello holdtime <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 15. |
3 | In the LDP address family configuration mode, set Hello interval on the specified interface. | esr(config-ldp-af-ipv4-if)# discovery hello interval <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 5. |
Algorithm for setting Keepalive holdtime parameter in the global LDP configuration
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | In the LDP configuration mode, set the Keepalive parameter. | esr(config-ldp)# keepalive <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 180. |
Algorithm for setting Keepalive holdtime parameter for the specific neighbor
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | In the neighbor configuration mode, set the Keepalive holdtime parameter. | esr(config-ldp-neig)# keepalive <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 180. |
Configuration example
Objective:
Override Hello holdtime (40 seconds) and Hello interval (10 seconds) parameters for the entire LDP process. For the neighbor with address 1.1.1.1 set the Keepalive holdtime to 150 seconds.
Solution:
ESR
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# discovery hello holdtime 40
ESR(config-ldp)# discovery hello interval 10
ESR(config-ldp)# neighbor 1.1.1.1
ESR(config-ldp-neig)# keepalive 150Check:
To view hello parameters:
ESR
ESR# sh mpls ldp discovery detailed
Local LDP ID: 4.4.4.4
Discovery sources:
Interfaces:
gigabitethernet 1/0/4:
Hello interval: 10 seconds
Transport IP address: 4.4.4.4
LDP ID: 1.1.1.1
Source IP address: 10.10.10.1
Transport IP address: 1.1.1.1
Hold time: 15 seconds
Proposed hold time: 40/15 (local/peer) seconds
To view parameter of the established TCP session:
ESR
ESR# sh mpls ldp neighbor 1.1.1.1
Peer LDP ID: 1.1.1.1; Local LDP ID 4.4.4.4
State: Operational
TCP connection: 1.1.1.1:646 - 4.4.4.4:45414
Messages sent/received: 15/15
Uptime: 00:06:31
Peer holdtime: 150
Keepalive interval: 50
LDP discovery sources:
Configuring session parameters in targeted-LDP
By default, the targeted LDP session is set to the following values:
Parameter | targeted-LDP |
|---|---|
Hello interval | 5 seconds |
Hold timer | 45 seconds |
Keepalive holdtime | 180 seconds |
Hold timer is a matching parameter — the smallest is chosen. This example shows that the ESR after matching set 30 seconds:
ESR1# sh mpls ldp discovery detailed
...
Targeted hellos:
1.1.1.1 -> 4.4.4.4:
Hello interval: 2 seconds
Transport IP address: 1.1.1.1
LDP ID: 4.4.4.4
Source IP address: 4.4.4.4
Transport IP address: 4.4.4.4
Hold time: 30 seconds
Proposed hold time: 30/45 (local/peer) secondsIf after matching, the Hello interval is greater than the Hold timer, then the Hello interval will be equal to Hold timer/3.
ESR routers have the possibility to flexibly configure Hello holdtime, Hello interval and Keepalive holdtime parameters: the parameters can be set for the entire LDP process, as well as for the corresponding neighbor.
Example output for the LDP process:
ESR# sh running-config mpls
mpls
ldp
router-id 1.1.1.1
keepalive 160
discovery targeted-hello holdtime 30
discovery targeted-hello interval 10
exit
exitExample output for a targeted-LDP session for a particular neighbor:
ESR# sh running-config mpls
mpls
ldp
router-id 1.1.1.1
neighbor 4.4.4.4
keepalive 160
targeted
discovery targeted-hello holdtime 30
discovery targeted-hello interval 45
exit
exit
exitIf parameters are set for both the LDP process and a specific neighbor, the priority will be the settings set for the neighbor.
ESR# sh running-config mpls
mpls
ldp
router-id 1.1.1.1
keepalive 160
discovery hello holdtime 90
discovery targeted-hello interval 30
neighbor 4.4.4.4
keepalive 140
targeted
discovery targeted-hello holdtime 45
discovery targeted-hello interval 15
exit
exit
exit
ESR# show mpls ldp discovery detailed
...
Targeted hellos:
1.1.1.1 -> 4.4.4.4:
Hello interval: 15 seconds
Transport IP address: 1.1.1.1
LDP ID: 4.4.4.4
Source IP address: 4.4.4.4
Transport IP address: 4.4.4.4
Hold time: 45 seconds
Proposed hold time: 45/45 (local/peer) seconds
ESR# show mpls ldp neighbor 4.4.4.4
Peer LDP ID: 4.4.4.4; Local LDP ID 1.1.1.1
State: Operational
TCP connection: 4.4.4.4:51861 - 1.1.1.1:646
Messages sent/received: 10/10
Uptime: 00:00:09
Peer holdtime: 140
Keepalive interval: 46
LDP discovery sources:
1.1.1.1 -> 4.4.4.4:Algorithm for setting Hello holdtime, Hello interval and Keepalive holdtime for the LDP process
1 | Configure the LDP (see section LDP configuration). | ||
2 | In the LDP configuration mode, set Hello holdtime. | esr(config-ldp)# discovery targeted-hello holdtime <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 45. |
3 | In the LDP configuration mode, set Hello interval. | esr(config-ldp)# discovery targeted- hello interval <TIME> | <TIME> — time in the range of [1..65535] seconds. Default value: 5. |
4 | In the LDP configuration mode, set Keepalive holdtime. | esr(config-ldp)# keepalive <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 180. |
Algorithm for setting Hello holdtime, Hello interval and Keepalive holdtime for the specific neighbor
1 | Configure the LDP (see section LDP configuration). | ||
2 | In the LDP neighbor configuration mode, set Hello holdtime. | esr(config-ldp-neig)# discovery targeted-hello holdtime <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 45. |
3 | In the LDP neighbor configuration mode, set Hello interval. | esr(config-ldp-neig)# discovery targeted- hello interval <TIME> | <TIME> — time in the range of [1..65535] seconds. Default value: 5. |
4 | In the LDP neighbor configuration mode, set Keepalive holdtime. | esr(config-ldp-neig)# keepalive <TIME> | <TIME> — time in the range of [3..65535] seconds. Default value: 180. |
Configuration example
Objective:
Override Hello holdtime (120 seconds) and Hello interval (30 seconds) parameters for the entire targeted-LDP process. For the neighbor with address 4.4.4.4 set the Keepalive holdtime to 150 seconds.
Solution:
ESR
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# discovery targeted-hello holdtime 40
ESR(config-ldp)# discovery targeted-hello interval 10
ESR(config-ldp)# neighbor 4.4.4.4
ESR(config-ldp-neig)# keepalive 150Check:
To view hello parameters of the targeted LDP session:
ESR
ESR1# sh mpls ldp discovery detailed
...
Targeted hellos:
1.1.1.1 -> 4.4.4.4:
Hello interval: 10 seconds
Transport IP address: 1.1.1.1
LDP ID: 4.4.4.4
Source IP address: 4.4.4.4
Transport IP address: 4.4.4.4
Hold time: 40 seconds
Proposed hold time: 40/45 (local/peer) seconds
To view parameter of the established TCP session:
ESR
ESR# sh mpls ldp neighbor 4.4.4.4
Peer LDP ID: 4.4.4.4; Local LDP ID 1.1.1.1
State: Operational
TCP connection: 4.4.4.4:34879 - 1.1.1.1:646
Messages sent/received: 11/11
Uptime: 00:01:05
Peer holdtime: 150
Keepalive interval: 50
LDP discovery sources:
1.1.1.1 -> 4.4.4.4:
Hello interval: 10 seconds
Holdtime: 40 seconds
...LDP tag filtering configuration
By default, routers allocate a separate label to each FEC. There are scenarios when it is necessary to allocate MPLS tags only for certain FECs.
Configuration algorithm
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | Create network type object-group. | esr(config)# object-group network <NAME> | <NAME> – name of a subnet list being configured, set by the string of up to 31 characters. |
3 | Describe the subnets for which labels will be assigned. | esr(config-object-group-network)# ip prefix <ADDR/LEN> | <ADDR/LEN> – IP address and subnet mask, defined as AAA.BBB.CCC.DDD/EE where each part AAA-DDD takes values of [0..255] and EE takes values of [1..32]. |
4 | In the context of the LDP configuration, apply the created object-group. | esr(config-ldp)# advertise-labels <NAME> | <NAME> – name of a subnet list being configured, set by the string of up to 31 characters. |
Tags will be allocated ONLY to the subnets described in the object-group, regardless of how they were learned (connected, local, IGP, etc.).
Prefixes must be described in the object-group.
The prefix must have an exact match with the route from the FIB.
This functionality is supported for IPv4.
Configuration example
Objective:
Assign MPLS tags only to FEC 10.10.0.2/32 and 10.10.0.1/32.
Solution:
On ESR_A and ESR_B create an object-group ADV_LABELS type network and add to it the prefixes 10.10.0.1/32 and 10.10.0.2/32 respectively.
ESR_A
esr(config)# object-group network ADV_LABELS
esr(config-object-group-network)# ip prefix 10.10.0.1/32
esr(config-object-group-network)# ip prefix 10.10.0.2/32ESR_B
esr(config)# object-group network ADV_LABELS
esr(config-object-group-network)# ip prefix 10.10.0.1/32
esr(config-object-group-network)# ip prefix 10.10.0.2/32
Apply the created object-group on both routers:
ESR_A и ESR_B
esr(config)# mpls
esr(config-ldp)# ldp
esr(config-ldp)# advertise-labels ADV_LABELSCheck:
On ESR_B make sure that the tag is assigned to the appropriate prefixes:
esr# sh mpls ldp bindings 10.10.0.1/32
10.10.0.1/32
local label: exp-null
remote label: 75 lsr: 172.16.0.1And not assigned to 192.168.2.0/24:
esr# sh mpls ldp bindings 192.168.2.0/24
esr#L2VPN Martini mode configuration
L2VPN allows organizing ethernet frames transmission through the MPLS domain. Allocation and distribution of tunnel labels, in this mode, is carried out by means of the LDP. In the implementation of L2VPN can be divided into two cases:
- P2P — 'point-to-point' tunnel;
- VPLS — 'point-to-multipoint' tunnel.
In both cases, a virtual channel (pseudo-wire) is created to transmit ethernet frames between routers. To negotiate pseudo-wire parameters, as well as to allocate and transfer tunnel labels between routers, an LDP session is established in the targeted mode.
L2VPN VPWS configuration algorithm
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | Create pw-class in the system and switch to the pw-class configuration mode. | esr(config-l2vpn)# pw-class <WORD> | <WORD> — pw-class name [1..31] characters long. |
3 | Add a description for pw-class (optional). | esr(config-l2vpn-pw-class)# description <LINE> | <LINE> – description. Set by the string [1..255] characters long. |
4 | Set the MTU value for the pseudo-wire included in the pw-class (optional). | esr(config-l2vpn-pw-class)# encapsulation | <MTU> — MTU value, takes values in the range of [552..10000] Default value: 1500. |
5 | Disable status-tlv messaging (optional). | esr(config-l2vpn-pw-class)# encapsulation | Default value: status-tlv enable |
6 | Create p2p-class in the system and switch to the p2p-class configuration mode. | esr(config-l2vpn)# p2p <NAME> | <NAME> — name of the p2p service, set by the string of up to 31 characters. |
7 | Specify Attached Circuit interface. | esr(config-l2vpn-p2p)# interface | <IF> – an interface's name, specified in the form described in Section Types and naming order of router interfaces; <TUN> – the name of the tunnel is specified as described in section Types and naming order of router tunnels. |
8 | Enable p2p tunnel. | esr(config-l2vpn-p2p)# enable | |
9 | Specify transport mode (optional). | esr(config-l2vpn-p2p)# transport-mode | <ethernet> — mode in which the 802.1Q tag is removed from the header when entering pseudo-wire; <vlan> — mode in which the 802.1Q tag can be saved when transmitted over pseudo-wire. Default value: ethernet. |
10 | Create a pseudo-wire and switch to its parameters configuration mode. | esr(config-l2vpn-p2p)# pw <PW_ID> <LSR_ID> | <PW_ID> — psewdowire identifier, specified in the range [1..4294967295]. <LSR_ID> — identifier of LSR to which pseudo-wire is built, specified as AAA.BBB.CCC.DDD, where each part takes values [0..255]. |
11 | Add a description for pseudo-wire (optional). | esr(config-l2vpn-pw)# description <LINE> | <LINE> – description. Set by the string [1..255] characters long. |
12 | Set pw-class for pseudo-wire. | esr(config-l2vpn-pw)# pw-class <WORD> | <WORD> — pw-class name [1..31] characters long. |
13 | Set the LSR address to which the pseudo-wire is set (optional if the neighbor address is the same as the LSR_ID). | esr(config-l2vpn-pw)# neighbor-address <ADDR> | <ADDR> – router IP address, defined as AAA.BBB.CCC.DDD where each part takes values of [0..255]. |
14 | Enable pseudo-wire. | esr(config-l2vpn-pw)# enable | |
If it is necessary to change the default settings for a targeted LDP session, see section Configuring session parameters in targeted-LDP. | |||
L2VPN VPWS configuration example
Objective:
Configure l2vpn so that ge1/0/2.100 interface of the CE1 router and ge1/0/2.100 interface of the CE2 router operate within the same broadcast domain.
Solution:
Pre-requisite:
- Enable Jumbo frames support with the 'system jumbo-frames' command (the device must be rebooted for the changes to take effect);
- Сonfigure IP addresses on interfaces according to the network structure shown in the figure above;
- Organize the exchange of routes between PE1 and PE2 using IGP (OSPF, IS-IS, RIP).
On the PE1 router create a sub-interface from which traffic from CE1 will be received:
PE1# configure
PE1(config)# interface gigabitethernet 1/0/4.100
PE1(config-subif)# exitSet the MTU value on the interface towards PE2 to 9600 to avoid MTU overrun after encapsulating the MPLS header and disable the firewall:
PE1#(config)# interface gigabitethernet 1/0/1
PE1(config-if-gi)# mtu 9600
PE1(config-if-gi)# ip firewall disable
PE1(config-if-gi)# exitAllow packets with an MPLS header to be received on the interface towards the MPLS network (in this example, the interface towards PE2):
PE1(config)# mpls
PE1(config-mpls)# forwarding interface gigabitethernet 1/0/1Configure the LDP protocol and enable neighbor detection on the interface towards PE2:
PE1(config-mpls)# ldp
PE1(config-ldp)# router-id 1.1.1.1
PE1(config-ldp)# address-family ipv4
PE1(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1
PE1(config-ldp-af-ipv4-if)# exit
PE1(config-ldp-af-ipv4)# transport-address 1.1.1.1
PE1(config-ldp-af-ipv4)# exit
PE1(config-ldp)# enable
PE1(config-ldp)# exitCreate a pw-class on the basis of which the virtual channel (pw) will be created later. Since, in this example, the default parameters will be applied to pw, it will be sufficient to specify the class name:
PE1(config-mpls)# l2vpn
PE1(config-l2vpn)# pw-class for_p2p_VLAN100
PE1(config-l2vpn-pw-class)# exitCreate a new l2vpn of type p2p and add pw to router PE3, take the pw identifier as VID for convenience (in this case equal to 100):
PE1(config-l2vpn)# p2p to_PE2_VLAN100
PE1(config-l2vpn-p2p)# interface gigabitethernet 1/0/4.100
PE1(config-l2vpn-p2p)# pw 100 3.3.3.3
PE1(config-l2vpn-pw)# pw-class for_p2p_VLAN100
PE1(config-l2vpn-pw)# enable
PE1(config-l2vpn-pw)# exit
PE1(config-l2vpn-p2p)# enable
PE1(config-l2vpn-p2p)# endApply the configuration:
PE1# commit
PE1# confirmConfigure the PE2 router in the same way as PE1:
PE2# configure
PE2(config)# interface gigabitethernet 1/0/4.100
PE2(config-subif)# exit
PE2#(config)# interface gigabitethernet 1/0/1
PE2(config-if-gi)# mtu 9600
PE1(config-if-gi)# ip firewall disable
PE1(config-if-gi)# exit
PE2(config)# mpls
PE2(config-mpls)# forwarding interface gigabitethernet 1/0/1
PE2(config-mpls)# ldp
PE2(config-ldp)# router-id 2.2.2.2
PE2(config-ldp)# address-family ipv4
PE2(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1
PE2(config-ldp-af-ipv4-if)# exit
PE2(config-ldp-af-ipv4)# transport-address 2.2.2.2
PE2(config-ldp-af-ipv4)# exit
PE2(config-ldp)# enable
PE2(config-ldp)# exit
PE2(config-mpls)# l2vpn
PE2(config-l2vpn)# pw-class for_p2p_VLAN100
PE2(config-l2vpn-pw-class)# exit
PE2(config-l2vpn)# p2p to_PE1_VLAN100
PE2(config-l2vpn-p2p)# interface gigabitethernet 1/0/4.100
PE2(config-l2vpn-p2p)# pw 100 1.1.1.1
PE2(config-l2vpn-pw)# pw-class for_p2p_VLAN100
PE2(config-l2vpn-pw)# enable
PE2(config-l2vpn-pw)# exit
PE2(config-l2vpn-p2p)# enable
PE2(config-l2vpn-p2p)# end
PE2# commit
PE2# confirmMake sure that the LDP neighborhood is established and display the virtual channel status (pseudowire) between PE1 and PE2:
PE2# show mpls ldp neighbor
Peer LDP ID: 1.1.1.1; Local LDP ID 2.2.2.2
State: Operational
TCP connection: 1.1.1.1:646 - 2.2.2.2:34625
Messages sent/received: 12/12
Uptime: 00:03:50
LDP discovery sources:
2.2.2.2 -> 1.1.1.1PE2# show mpls l2vpn pseudowire
Neighbor PW ID Type Status
--------------------------------------- ---------- ---------- ------
1.1.1.1 100 Ethernet UpThe LDP neighborhood is established, pseudowire has moved to 'UP' status. The l2vpn p2p type configuration is now complete.
L2VPN VPLS configuration algorithm
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | Create a network bridge in the system without specifying an IP address (see section Bridge configuration). | ||
3 | Create pw-class in the system and switch to the pw-class configuration mode. | esr(config-l2vpn)# pw-class <WORD> | <WORD> — pw-class name [1..31] characters long. |
4 | Add a description for pw-class (optional). | esr(config-l2vpn-pw-class)# description <LINE> | <LINE> — description. Set by the string [1..255] characters long. |
5 | Set the MTU value for the pseudo-wire included in the pw-class (optional). | esr(config-l2vpn-pw-class)# encapsulation | <MTU> — MTU value, takes values in the range of [552..10000]. Default value: 1500. |
6 | Disable status-tlv messaging (optional). | esr(config-l2vpn-pw-class)# encapsulation | Default value: status-tlv enable. |
7 | Create VPLS domain in the system and switch to the VPLS domain configuration mode. | esr(config-l2vpn)# vpls <NAME> | <NAME> — name of the p2p service, set by the string of up to 31 characters. |
8 | Enable VPLS tunnel. | esr(config-l2vpn-vpls)# enable | |
9 | Add bridge domain. | esr (config-l2vpn-vpls)# bridge-group <ID> | <ID> — bridge domain identifier, specified in the range [1..250]. |
10 | Specify transport mode (optional). | esr(config-l2vpn-vpls)# transport-mode | <ethernet> — mode in which the 802.1Q tag is removed from the header when entering pseudo-wire; |
11 | Create a pseudo-wire and switch to its parameters configuration mode | esr(config-l2vpn-vpls)# pw <PW_ID> <LSR_ID> | <PW_ID> — psewdowire identifier, specified in the range [1..4294967295]. <LSR_ID> — identifier of LSR to which pseudo-wire is built, specified as AAA.BBB.CCC.DDD, where each part takes values [0..255]. |
12 | Add a description for pseudo-wire (optional). | esr(config-l2vpn-pw)# description <LINE> | <LINE> — description. Set by the string [1..255] characters long. |
13 | Set pw-class for pseudo-wire | esr(config-l2vpn-pw)# pw-class <WORD> | <WORD> — pw-class name [1..31] characters long. |
14 | Set the LSR address to which the pseudo-wire is set (Optional if the neighbor address is the same as the LSR_ID). | esr(config-l2vpn-pw)# neighbor-address <ADDR> | <ADDR> – router IP address, defined as AAA.BBB.CCC.DDD where each part takes values of [0..255]. |
15 | Enable pseudo-wire. | esr(config-l2vpn-pw)# enable | |
16 | If the topology of the VPLS domain to be created requires more than one pseudo-wire, repeat steps 10 to 14. | ||
17 | If it is necessary to change the default settings for a targeted LDP session, see section Configuring session parameters in targeted-LDP. | ||
L2VPN VPLS configuration example
Objective:
Configure l2vpn so that CE1, CE2, CE3 routers have L2 connectivity through the gi1/0/2.100 and gi1/0/4 (CE2) interfaces.
Solution:
Pre-requisite:
- Enable Jumbo frames support with the 'system jumbo-frames' command (the device must be rebooted for the changes to take effect);
- Сonfigure IP addresses on interfaces according to the network structure shown in the figure above;
- Organize the exchange of routes between PE1, PE2 and PE3 using IGP (OSPF, IS-IS).
On router PE1, create a bridge group and enable it:
PE1# configure
PE1(config)# bridge 10
PE1(config-bridge)# enable
PE1(config-bridge)# exitOn the Interface to the CE1 side, include it in the created bridge group:
PE1(config)# interface gigabitethernet 1/0/4.100
PE1(config-subif)# bridge-group 10
PE1(config-subif)# exitSet the MTU value on the interface towards PE2 to 9600 to avoid MTU overrun after encapsulating the MPLS header and disable the firewall:
PE1#(config)# interface gigabitethernet 1/0/1
PE1(config-if-gi)# mtu 9600
PE1(config-if-gi)# ip firewall disable
PE1(config-if-gi)# exitAllow packets with an MPLS header to be received on the interface towards the MPLS network (in this example, the interface towards PE2):
PE1(config)# mpls
PE1(config-mpls)# forwarding interface gigabitethernet 1/0/1Configure the LDP protocol and enable neighbor detection on the interface towards PE2:
PE1(config-mpls)# ldp
PE1(config-ldp)# router-id 1.1.1.1
PE1(config-ldp)# address-family ipv4
PE1(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1
PE1(config-ldp-af-ipv4-if)# exit
PE1(config-ldp-af-ipv4)# transport-address 1.1.1.1
PE1(config-ldp-af-ipv4)# exit
PE1(config-ldp)# enable
PE1(config-ldp)# exitCreate a pw-class on the basis of which the virtual channels (pw) will be created later. Since, in this example, the default parameters will be applied to pw, it will be sufficient to specify the class name:
PE1(config-mpls)# l2vpn
PE1(config-l2vpn)# pw-class for_vpls1
PE1(config-l2vpn-pw-class)# exitCreate a new l2vpn of vpls type and add pw to routers PE2 and PE3, take the pw identifier as VID for convenience (in this case equal to 100):
PE1(config-l2vpn)# vpls vpls1
PE1(config-l2vpn-vpls)# bridge-group 10
PE1(config-l2vpn-vpls)# pw 100 2.2.2.2
PE1(config-l2vpn-pw)# pw-class for_vpls1
PE1(config-l2vpn-pw)# enable
PE1(config-l2vpn-pw)# exit
PE1(config-l2vpn-vpls)# pw 100 3.3.3.3
PE1(config-l2vpn-pw)# pw-class for_vpls1
PE1(config-l2vpn-pw)# enable
PE1(config-l2vpn-pw)# exit
PE1(config-l2vpn-vpls)# enable
PE1(config-l2vpn-vpls)# endApply the created configuration:
PE1# commit
PE1# confirm Configure PE2 and PE3 routers in the same way as PE1:
PE2# configure
PE2(config)# bridge 10
PE2(config-bridge)# enable
PE2(config-bridge)# exit
PE2(config)# interface gigabitethernet 1/0/4.100
PE2(config-subif)# bridge-group 10
PE2(config-subif)# exit
PE2(config)# interface gigabitethernet 1/0/2
PE2(config-if-gi)# mtu 9600
PE2(config-if-gi)# ip firewall disable
PE2(config-if-gi)# exit
PE2(config)# mpls
PE2(config-mpls)# forwarding interface gigabitethernet 1/0/1
PE2(config-mpls)# forwarding interface gigabitethernet 1/0/2
PE2(config-mpls)# ldp
PE2(config-ldp)# enable
PE2(config-ldp)# router-id 2.2.2.2
PE2(config-ldp)# address-family ipv4
PE2(config-ldp-af-ipv4)# transport-address 2.2.2.2
PE2(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1
PE2(config-ldp-af-ipv4-if)# exit
PE2(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
PE2(config-ldp-af-ipv4-if)# exit
PE2(config-ldp-af-ipv4)# exit
PE2(config-ldp)# exit
PE2(config-mpls)# l2vpn
PE2(config-l2vpn)# pw-class for_vpls1
PE2(config-l2vpn-pw-class)# exit
PE2(config-l2vpn)# vpls vpls1
PE2(config-l2vpn-vpls)# enable
PE2(config-l2vpn-vpls)# bridge-group 10
PE2(config-l2vpn-vpls)# pw 100 1.1.1.1
PE2(config-l2vpn-pw)# pw-class for_vpls1
PE2(config-l2vpn-pw)# enable
PE2(config-l2vpn-pw)# exit
PE2(config-l2vpn-vpls)# pw 100 3.3.3.3
PE2(config-l2vpn-pw)# pw-class for_vpls1
PE2(config-l2vpn-pw)# enable
PE2(config-l2vpn-pw)# end
PE2# commit
PE2# confirm
PE3(config)# bridge 10
PE3(config-bridge)# enable
PE3(config-bridge)# exit
PE3(config)# interface gigabitethernet 1/0/4.100
PE3(config-subif)# bridge-group 10
PE3(config-subif)# exit
PE3(config)# interface gigabitethernet 1/0/1
PE3(config-if-gi)# mtu 9600
PE3(config-if-gi)# ip firewall disable
PE3(config-if-gi)# exit
PE3(config)# mpls
PE3(config-mpls)# forwarding interface gigabitethernet 1/0/1
PE3(config-mpls)# exit
PE3(config)# mpls
PE3(config-mpls)# ldpPE3(config-ldp)# enable
PE3(config-ldp)# router-id 3.3.3.3
PE3(config-ldp)# address-family ipv4
PE3(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1
PE3(config-ldp-af-ipv4-if)# exit
PE3(config-ldp-af-ipv4)# transport-address 3.3.3.3
PE3(config-ldp-af-ipv4)# exit
PE3(config-ldp)# exit
PE3(config-mpls)# l2vpn
PE3(config-l2vpn)# pw-class for_vpls
PE3(config-l2vpn-pw-class)# exit
PE3(config-l2vpn)# vpls vpls1
PE3(config-l2vpn-vpls)# enable
PE3(config-l2vpn-vpls)# bridge-group 10
PE3(config-l2vpn-vpls)# pw 100 2.2.2.2
PE3(config-l2vpn-pw)# pw-class for_vpls
PE3(config-l2vpn-pw)# enable
PE3(config-l2vpn-pw)# exit
PE3(config-l2vpn-vpls)# pw 100 1.1.1.1
PE3(config-l2vpn-pw)# pw-class for_vpls
PE3(config-l2vpn-pw)# enable
PE3(config-l2vpn-pw)# end
PE3# commit
PE3# confirmMake sure that the LDP neighborhood is established and display the virtual channel status (pseudowire) between PE1, PE2 and PE3:
PE3# show mpls ldp neighbor
Peer LDP ID: 1.1.1.1; Local LDP ID 3.3.3.3
State: Operational
TCP connection: 1.1.1.1:646 - 3.3.3.3:45979
Messages sent/received: 22/22
Uptime: 00:13:16
LDP discovery sources:
3.3.3.3 -> 1.1.1.1
Peer LDP ID: 2.2.2.2; Local LDP ID 3.3.3.3
State: Operational
TCP connection: 2.2.2.2:646 - 3.3.3.3:59627
Messages sent/received: 22/22
Uptime: 00:13:20
LDP discovery sources:
3.3.3.3 -> 2.2.2.2
gigabitethernet 1/0/1
PE3# show mpls l2vpn pseudowire
Neighbor PW ID Type Status
--------------------------------------- ---------- ---------- ------
1.1.1.1 100 Ethernet Up
2.2.2.2 100 Ethernet UpThe LDP neighborhood is established, pseudowire has moved to 'UP' status. The l2vpn configuration is now complete.
L2VPN Kompella mode configuration
Unlike Martini mode, where all operation is done by the LDP, in this mode the LDP does only operate with transport labels. Autodetection (not typical of LDP signaling), and the construction of a pseudowire connection is entrusted to BGP.
L2VPN VPLS configuration algorithm
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure the LDP (see section LDP configuration). | ||
2 | Create a network bridge in the system without specifying an IP address (see section Bridge configuration). | ||
3 | Create VPLS domain in the system and switch to the VPLS domain configuration mode. | esr(config-l2vpn)# vpls <NAME> | <NAME> — name of the p2p service, set by the string of up to 31 characters. |
4 | Enable VPLS tunnel. | esr(config-l2vpn-vpls)# enable | |
5 | Add bridge domain. | esr(config-l2vpn-vpls)# bridge-group <ID> | <ID> — bridge domain identifier, specified in the range [1..250]. |
6 | Switch to the autodiscovery bgp configuration context. | esr(config-l2vpn-vpls)# autodiscovery bgp | |
7 | Specify route distinguisher for the given VPLS instance. | esr(config-bgp)# rd <RD> | <RD> – Route distinguisher value, specified in one of the following forms:
|
8 | Specify route target import for the given VPLS instance. | esr(config-bgp)# route-target import <RT> | <RT> – Route-target value, specified in one of the following forms:
|
9 | Specify route target export for the given VPLS instance. | esr(config-bgp)# route-target export <RT> | <RT> – Route-target value, specified in one of the following forms:
|
10 | Specify ve id. | esr(config-bgp)# ve id <ID> | <ID> — VPLS instance identifier, specified in the range [1..16384]. |
11 | Specify vpn id. | esr (config-bgp)# vpn id <ID> | <ID> — VPN identifier, specified in the range [1..4294967295] |
12 | Specify ve range (optional). | esr (config-bgp)# ve range <RANGE> | <RANGE> — range of VPLS border device identifiers [8..100]. |
13 | Specify mtu (optional). | esr (config-bgp)# mtu <VALUE> | <VALUE> — MTU value [552..10000]. |
14 | Enable ignoring encapsulation type (optional). | esr(config-bgp)# ignore encapsulation-mismatch | |
15 | Enable ignoring MTU values (optional). | esr(config-bgp)# ignore mtu-mismatch | |
16 | In the context of address-family l2vpn vpls BGP configuration, enable extended attribute transfer. | esr(config-bgp-neighbor-af)# send-community extended |
L2VPN VPLS configuration example
Objective:
Configure L2VPN service: all CE devices must work within the same broadcast domain.
Solution:
First perform the following steps:
- Enable Jumbo frames support with the 'system jumbo-frames' command (the device must be rebooted for the changes to take effect);
- Сonfigure IP addresses on interfaces according to the network structure shown in the figure above;
- Organize the exchange of routes between PE1, PE2, PE3 and RR using IGP (OSPF, IS-IS).
Configure the RR router:
hostname RR
system jumbo-frames
router ospf 1
area 0.0.0.0
enable
exit
enable
exit
interface gigabitethernet 1/0/2
mtu 9500
ip firewall disable
ip address 10.30.0.2/30
ip ospf instance 1
ip ospf
exit
interface gigabitethernet 1/0/3
mtu 9500
ip firewall disable
ip address 10.31.0.2/30
ip ospf instance 1
ip ospf
exit
interface loopback 1
ip address 10.10.0.4/32
ip ospf instance 1
ip ospf
exit
mpls
ldp
router-id 10.10.0.4
address-family ipv4
interface gigabitethernet 1/0/2
exit
interface gigabitethernet 1/0/3
exit
exit
enable
exit
forwarding interface gigabitethernet 1/0/2
forwarding interface gigabitethernet 1/0/3
exit
Configure the BGP Route Reflector for the address family l2vpn:
RR(config)# router bgp 65500
RR(config-bgp)# router-id 10.10.0.4
RR(config-bgp)# neighbor 10.10.0.1
RR(config-bgp-neighbor)# remote-as 65500
RR(config-bgp-neighbor)# route-reflector-client
RR(config-bgp-neighbor)# update-source 10.10.0.4
RR(config-bgp-neighbor)# address-family l2vpn vpls
RR(config-bgp-neighbor-af)# send-community extended
RR(config-bgp-neighbor-af)# enable
RR(config-bgp-neighbor-af)# exit
RR(config-bgp-neighbor)# enable
RR(config-bgp-neighbor)# exit
RR(config-bgp)# neighbor 10.10.0.2
RR(config-bgp-neighbor)# remote-as 65500
RR(config-bgp-neighbor)# route-reflector-client
RR(config-bgp-neighbor)# update-source 10.10.0.4
RR(config-bgp-neighbor)# address-family l2vpn vpls
RR(config-bgp-neighbor-af)# send-community extended
RR(config-bgp-neighbor-af)# enable
RR(config-bgp-neighbor-af)# exit
RR(config-bgp-neighbor)# enable
RR(config-bgp-neighbor)# exit
RR(config-bgp)# neighbor 10.10.0.3
RR(config-bgp-neighbor)# remote-as 65500
RR(config-bgp-neighbor)# route-reflector-client
RR(config-bgp-neighbor)# update-source 10.10.0.4
RR(config-bgp-neighbor)# address-family l2vpn vpls
RR(config-bgp-neighbor-af)# send-community extended
RR(config-bgp-neighbor-af)# enable
RR(config-bgp-neighbor-af)# exit
RR(config-bgp-neighbor)# enable
RR(config-bgp-neighbor)# exit
RR(config-bgp)# enable
Configure BGP on the PE routers:
Pre-configuration
hostname PE1
system jumbo-frames
router ospf 1
area 0.0.0.0
enable
exit
enable
exit
interface gigabitethernet 1/0/1
mtu 9500Pre-configuration
ip firewall disable
ip address 10.20.0.1/30
ip ospf instance 1
ip ospfexit
interface gigabitethernet 1/0/2
mtu 9500
ip firewall disable
ip address 10.30.0.1/30
ip ospf instance 1
ip ospf
exitinterface gigabitethernet 1/0/3
mtu 9500
ip firewall disable
ip address 10.22.0.1/30
ip ospf instance 1
ip ospf
exit
interface loopback 1
ip address 10.10.0.1/32
ip ospf instance 1
ip ospf
exit
mpls
ldp
router-id 10.10.0.1
address-family ipv4
interface gigabitethernet 1/0/1
exit
interface gigabitethernet 1/0/2
exit
interface gigabitethernet 1/0/3
exit
exit
enable
exit
forwarding interface gigabitethernet 1/0/1
forwarding interface gigabitethernet 1/0/2
forwarding interface gigabitethernet 1/0/3
exit
BGP configuration:
PE1(config)# router bgp 65500
PE1(config-bgp)# neighbor 10.10.0.4
PE2(config-bgp)# router-id 10.10.0.1
PE1(config-bgp-neighbor)# remote-as 65500
PE1(config-bgp-neighbor)# update-source 10.10.0.1
PE1(config-bgp-neighbor)# address-family l2vpn vpls
PE1(config-bgp-neighbor-af)# send-community extended
PE1(config-bgp-neighbor-af)# enable
PE1(config-bgp-neighbor-af)# exit
PE1(config-bgp-neighbor)# enable
PE1(config-bgp-neighbor)# exit
PE1(config-bgp)# enable
PE1(config-bgp)# exit
Check that the BGP session with RR is successfully established:
PE1# show bgp neighbors
BGP neighbor is 10.10.0.4
BGP state: Established
Neighbor address: 10.10.0.4
Neighbor AS: 65500
Neighbor ID: 10.10.0.4
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: internal multihop AS4
Source address: 10.10.0.1
Weight: 0
Hold timer: 110/180
Keepalive timer: 21/60
Uptime: 7375 sConfiguration of BGP on PE2:
Pre-configuration
hostname PE2
system jumbo-frames
router ospf 1
area 0.0.0.0
enable
exit
enable
exitPre-configuration
interface gigabitethernet 1/0/1
mtu 9500
ip firewall disable
ip address 10.20.0.2/30
ip ospf instance 1
ip ospf
exit
interface gigabitethernet 1/0/2
mtu 9500
ip firewall disable
ip address 10.21.0.1/30
ip ospf instance 1
ip ospf
exit
interface gigabitethernet 1/0/3
mtu 9500
ip firewall disable
ip address 10.31.0.1/30
ip ospf instance 1
ip ospf
exit
interface loopback 1
ip address 10.10.0.2/32
ip ospf instance 1
ip ospf
exit
mpls
ldp
router-id 10.10.0.2
address-family ipv4
interface gigabitethernet 1/0/1
exit
interface gigabitethernet 1/0/2
exit
interface gigabitethernet 1/0/3
exit
exit
enable
exit
forwarding interface gigabitethernet 1/0/1
forwarding interface gigabitethernet 1/0/2
forwarding interface gigabitethernet 1/0/3
exitPE2(config)# router bgp 65500
PE2(config-bgp)# router-id 10.10.0.2
PE2(config-bgp)# neighbor 10.10.0.4
PE2(config-bgp-neighbor)# remote-as 65500
PE2(config-bgp-neighbor)# update-source 10.10.0.2
PE2(config-bgp-neighbor)# address-family l2vpn vpls
PE2(config-bgp-neighbor-af)# send-community extended
PE2(config-bgp-neighbor-af)# enable
PE2(config-bgp-neighbor-af)# exit
PE2(config-bgp-neighbor)# enable
PE2(config-bgp-neighbor)# exit
PE2(config-bgp)# enable
PE2(config-bgp)# exit
Check that the session with RR is successfully established:
PE2# show bgp neighbors
BGP neighbor is 10.10.0.4
BGP state: Established
Neighbor address: 10.10.0.4
Neighbor AS: 65500
Neighbor ID: 10.10.0.4
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: internal multihop AS4
Source address: 10.10.0.2
Weight: 0
Hold timer: 113/180
Keepalive timer: 56/60
Uptime: 47 sConfiguration of BGP on PE3:
Pre-configuration
hostname PE3
system jumbo-frames
router ospf 1
area 0.0.0.0
enable
exit
enable
exit
interface gigabitethernet 1/0/2
mtu 9500
ip firewall disable
ip address 10.21.0.2/30
ip ospf instance 1
ip ospf
exit
interface gigabitethernet 1/0/3
mtu 9500
ip firewall disable
ip address 10.22.0.2/30
ip ospf instance 1
ip ospf
exit
interface loopback 1
ip address 10.10.0.3/24
ip ospf instance 1
ip ospf
exit
mpls
ldp
router-id 10.10.0.3
address-family ipv4
interface gigabitethernet 1/0/2
exit
interface gigabitethernet 1/0/3
exit
exit
enable
exit
forwarding interface gigabitethernet 1/0/2
forwarding interface gigabitethernet 1/0/3
exitPE3(config)# router bgp 65500
PE3(config-bgp)# router-id 10.10.0.3
PE3(config-bgp)# neighbor 10.10.0.4
PE3(config-bgp-neighbor)# remote-as 65500
PE3(config-bgp-neighbor)# update-source 10.10.0.3
PE3(config-bgp-neighbor)# address-family l2vpn vpls
PE3(config-bgp-neighbor-af)# send-community extended
PE3(config-bgp-neighbor-af)# enable
PE3(config-bgp-neighbor-af)# exit
PE3(config-bgp-neighbor)# enable
PE3(config-bgp-neighbor)# exit
PE3(config-bgp)# enable
PE3(config-bgp)# exit
Check that the BGP session is successfully established:
PE3# show bgp neighbors
BGP neighbor is 10.10.0.4
BGP state: Established
Neighbor address: 10.10.0.4
Neighbor AS: 65500
Neighbor ID: 10.10.0.4
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: internal multihop AS4
Source address: 10.10.0.3
Weight: 0
Hold timer: 141/180
Keepalive timer: 27/60
Uptime: 77 sThe next step is to create a bridge domain on each PE router, and include an interface (Attachment circuit, AC) that looks towards CE:
PE1:
PE1(config)# bridge 1
PE1(config-bridge)# enable
PE1(config-bridge)# exit
PE1(config)# interface gigabitethernet 1/0/4
PE1(config-if-gi)# mode switchport
PE1(config-if-gi)# bridge-group 1Check that the interface is included into the bridge domain:
PE1# show interfaces bridge
Bridges Interfaces
---------- --------------------------------------------------------------
bridge 1 gi1/0/4
PE1# sh interfaces status bridge 1
Interface 'bridge 1' status information:
Description: --
Operational state: Up
Administrative state: Up
Supports broadcast: Yes
Supports multicast: Yes
MTU: 1500
MAC address: a8:f9:4b:ac:4d:15
Last change: 4 minutes and 22 seconds
Mode: Routerport
PE2:
PE2(config)# bridge 1
PE2(config-bridge)# enable
PE2(config-bridge)# exit
PE2(config)# interface gigabitethernet 1/0/4
PE2(config-if-gi)# mode switchport
PE2(config-if-gi)# bridge-group 1
PE2# show interfaces bridge 1
Bridges Interfaces
---------- --------------------------------------------------------------
bridge 1 gi1/0/4
PE2# sh interfaces status bridge 1
Interface 'bridge 1' status information:
Description: --
Operational state: Up
Administrative state: Up
Supports broadcast: Yes
Supports multicast: Yes
MTU: 1500
MAC address: a8:f9:4b:ad:f2:45
Last change: 10 seconds
Mode: routerport
PE3:
PE3(config)# bridge 1
PE3(config-bridge)# enable
PE3(config-bridge)# exit
PE3(config)# interface gigabitethernet 1/0/4
PE3(config-if-gi)# mode switchport
PE3(config-if-gi)# bridge-group 1
PE3# show interfaces bridge
Bridges Interfaces
---------- --------------------------------------------------------------
bridge 1 gi1/0/4
PE3# sh interfaces status bridge
Interface Admin Link MTU MAC address Last change Mode
state state
------------------ ----- ----- ------ ------------------ ------------------------- ----------
bridge 1 Up Up 1500 a8:f9:4b:ac:df:f0 1 minute and 21 seconds Routerport
PE3# sh interfaces status bridge 1
Interface 'bridge 1' status information:
Description: --
Operational state: Up
Administrative state: Up
Supports broadcast: Yes
Supports multicast: Yes
MTU: 1500
MAC address: a8:f9:4b:ac:df:f0
Last change: 1 minute and 24 seconds
Mode: Routerport
Next, perform the VPLS configuration:
PE1:
Switch to the L2VPN configuration context and include the previously created bridge domain.
PE1(config)# mpls
PE1(config-mpls)# l2vpn
PE1(config-l2vpn)# vpls l2vpn
PE1(config-l2vpn-vpls)# bridge-group 1
Specify RD, RT, VE-ID, VPN-ID according to the network scheme and activate the service:
In some cases entering such parameters as RD and RT can be skipped: if only VPN ID is specified, they will be formed as follows: <AS number> : <vpn-id>.
For example, we have an AS 65550 autonomous system number, vpn-id is 10, then the following parameters will be generated:
RD - 65550: 10.
RT import/export - 65550:10.
PE1(config-l2vpn-vpls)# autodiscovery bgp
PE1(config-bgp)# rd 65500:100
PE1(config-bgp)# route-target import 65500:100
PE1(config-bgp)# route-target export 65500:100
PE1(config-bgp)# ve id 1
PE1(config-bgp)# vpn id 1
PE1(config-bgp)# exit
PE1(config-l2vpn-vpls)# enable
After activating the service, check that route information appeared in the l2vpn table, and it is advertised on RR:
PE1# show ip bgp l2vpn vpls all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher VID VBO VBS Next hop Metric LocPrf Weight Path
----- --------------------- ----- ----- ----- ---------- ---------- ---------- ------ ------
*> 65500:100 1 1 10 -- -- -- --
PE1# show ip bgp l2vpn vpls all neighbor 10.10.0.4 advertise-routes
Origin codes: i - IGP, e - EGP, ? - incomplete
Route Distinguisher VID VBO VBS Next hop Metric LocPrf Path
--------------------- ----- ----- ----- --------------- ---------- ---------- ------
65500:100 1 1 10 10.10.0.1 -- 100 i
* Detailed output of the advertised route *
PE1# show ip bgp l2vpn vpls all neighbor 10.10.0.4 advertise-routes ve-id 1 block
-offset 1
BGP routing table entry for 65500:100 VE ID 1 VE Block Offset 1
VE Block Size: 10
Label Base: 86
Next hop: 10.10.0.1
AS path: --
Origin: IGP
Local preference: 100
Extended Community: RT:65500:100
Layer2-info: encaps (VPLS), control flags(0x00), MTU (1500)Proceed to the PE2 configuration:
PE2(config-mpls)# l2vpn
PE2(config-l2vpn)# vpls l2vpn
PE2(config-l2vpn-vpls)# bridge-group 1
PE2(config-l2vpn-vpls)# autodiscovery bgp
PE2(config-bgp)# rd 65500:100
PE2(config-bgp)# route-target export 65500:100
PE2(config-bgp)# route-target import 65500:100
PE2(config-bgp)# vpn id 2
PE2(config-bgp)# ve id 2
PE2(config-bgp)# exit
PE2(config-l2vpn-vpls)# enable Check that PE2 is advertising the route information on RR:
PE2# show ip bgp l2vpn vpls all neighbor 10.10.0.4 advertise-routes
Origin codes: i - IGP, e - EGP, ? - incomplete
Route Distinguisher VID VBO VBS Next hop Metric LocPrf Path
--------------------- ----- ----- ----- ------------- ---------- ---------- ------
65500:100 2 1 10 10.10.0.2 -- 100 i
In the l2vpn table you can see its routes as well as routes from PE1:
PE2# show ip bgp l2vpn vpls all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher VID VBO VBS Next hop Metric LocPrf Weight Path
----- --------------------- ----- ----- ----- ----------- ---------- ---------- ------ -----
*> 65500:100 2 1 10 -- -- -- --
*>i 65500:100 1 1 10 10.10.0.1 -- 100 0 i
The calculated service marks can be viewed as follows:
1)
PE2# show mpls l2vpn bindings
Neighbor: 10.10.0.1, PW ID: 2, VE ID: 1
Local label: 45
Encasulation Type: VPLS
Control flags: 0x00
MTU: 1500
Remote label: 87
Encasulation Type: VPLS
Control flags: 0x00
MTU: 15002)
PE2# show mpls forwarding-table
Local Outgoing Prefix Outgoing Next Hop
label label or tunnel ID Interface
-------- -------- ----------------- -------------- ----------
45 87 PW ID 2 -- 10.10.0.1Check the service state:
PE2# show mpls l2vpn vpls l2vpn
VPLS: l2vpn
bridge 1:
MTU: 1500
Status: Up
ACs:
gigabitethernet 1/0/4:
MTU: 1500
Status: Up
PWs:
PW ID 2, Neighbor 10.10.0.1:
MTU: 1500
Last change: 00:21:33
Status: Up
Proceed to the PE3 configuration:
PE3# config
PE3(config)# mpls
PE3(config-mpls)# l2vpn
PE3(config-l2vpn)# vpls l2vpn
PE3(config-l2vpn-vpls)# bridge-group 1
PE3(config-l2vpn-vpls)# autodiscovery bgp
PE3(config-bgp)# rd 65500:100
PE3(config-bgp)# route-target export 65500:100
PE3(config-bgp)# route-target import 65500:100
PE3(config-bgp)# ve id 3
PE3(config-bgp)# vpn id 3
PE3(config-bgp)# exit
PE3(config-l2vpn-vpls)# enableCheck the routing information in PE3:
PE3# show ip bgp l2vpn vpls all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher VID VBO VBS Next hop Metric LocPrf Weight Path
----- --------------------- ----- ----- ----- ----------- ---------- ---------- ------ -----
*> 65500:100 3 1 10 -- -- -- --
*>i 65500:100 2 1 10 10.10.0.2 -- 100 0 i
*>i 65500:100 1 1 10 10.10.0.1 -- 100 0 i
Check that PE3 is advertising the route information on RR:
PE3# show ip bgp l2vpn vpls all neighbor 10.10.0.4 advertise-routes
Origin codes: i - IGP, e - EGP, ? - incomplete
Route Distinguisher VID VBO VBS Next hop Metric LocPrf Path
--------------------- ----- ----- ----- ----------- ------- -------- -----
65500:100 3 1 10 10.10.0.3 -- 100 i
Check that the pseudowire is built before both PEs and is in the 'UP' status:
PE3# show mpls l2vpn vpls l2vpn
VPLS: l2vpn
bridge 1:
MTU: 1500
Status: Up
ACs:
gigabitethernet 1/0/4:
MTU: 1500
Status: Up
PWs:
PW ID 3, Neighbor 10.10.0.2:
MTU: 1500
Last change: 00:06:08
Status: Up
PW ID 3, Neighbor 10.10.0.1:
MTU: 1500
Last change: 00:06:08
Status: Up
Check the network availability of client equipment (CE):
CE3# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
!!!!!
--- 192.168.0.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4004ms
rtt min/avg/max/mdev = 0.173/0.208/0.290/0.045 ms
CE3# ping 192.168.0.2
PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data.
!!!!!
--- 192.168.0.2 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4004ms
rtt min/avg/max/mdev = 0.158/0.204/0.255/0.032 ms
PE3# sh mac address-table bridge 1
VID MAC Address Interface Type
----- ------------------ ------------------------------ -------
-- a8:f9:4b:aa:11:08 gigabitethernet 1/0/4 Dynamic
-- a8:f9:4b:aa:11:06 dypseudowire 3_10.10.0.1 Dynamic
-- a8:f9:4b:aa:11:07 dypseudowire 3_10.10.0.2 Dynamic
3 valid mac entries
L2VPN service configuration is now complete.
L3VPN configuration
L3VPN service allows to combine distributed client IP networks, and ensure the transfer of traffic between them within a single VRF.
The current implementation of MP-BGP only supports VPN-IPv4 routes (AF I= 1, SAFI = 128).
Configuration algorithm
Step | Description | Command | Keys |
|---|---|---|---|
1 | Configure addressing and one of IGP on all P and PE routers. | ||
2 | Configure LDP transport tag distribution. | ||
3 | Create VRF. | esr(config)# ip vrf <VRF> | <VRF> – VRF instance name, set by the string of up to 31 characters. |
4 | Specify route distinguisher for the given VRF. | esr(config-vrf)# rd <RD> | <RD> – Route distinguisher value, specified in one of the following forms:
|
5 | Specify route target import for the given VRF. | esr(config-vrf)# route-target import <RT> | <RT> – Route-target value, specified in one of the following forms:
|
6 | Specify route target export for the given VRF. | esr(config-vrf)# route-target export <RT> | <RT> – route-target value, specified in one of the following forms:
|
7 | Specify the allowed number of routes for this VRF. | esr(config-vrf)# ip protocols <PROTOCOLS> max-routes <VALUE> | <PROTOCOL> – protocol type, may take following values: rip (only in global mode), ospf, isis, bgp; <VALUE> – amount of routes in the routing table, takes values in the range of:
|
8 | In the context of address-family VPNv4 BGP configuration, enable extended attribute transfer. | esr(config-bgp-neighbor-af)# send-community extended |
Configuration example
Objective:
Configure L3VPN based on MPLS technology between ESR1 and ESR3. The final result of the configuration is the appearance of connectivity between nodes connected to the VRF on different routers in the network (i.e. the union of VRFs on different routers via MPLS transport). In this case, transfer of MPLS service tags for L3VPN service via MP-BGP and transfer of transport tags to reach nexthop addresses of received BGP routes must be provided.
Solution:
Configuring addressing and enabling IGP and P/PE on routers:
ESR1
ESR1(config)# router ospf log-adjacency-changes
ESR1(config)# router ospf 1
ESR1(config-ospf)# router-id 1.1.1.1
ESR1(config-ospf)# area 0.0.0.0
ESR1(config-ospf-area)# enable
ESR1(config-ospf-area)# exit
ESR1(config-ospf)# enable
ESR1(config-ospf)# exit
ESR1(config)#
ESR1(config)# interface loopback 1
ESR1(config-loopback)# ip address 1.1.1.1/32
ESR1(config-loopback)# ip ospf instance 1
ESR1(config-loopback)# ip ospf
ESR1(config-loopback)# exit
ESR1(config)#
ESR1(config)# interface gigabitethernet 1/0/1.10
ESR1(config-subif)# ip firewall disable
ESR1(config-subif)# ip address 10.10.10.1/30
ESR1(config-subif)# ip ospf instance 1
ESR1(config-subif)# ip ospf
ESR1(config-subif)# exit
ESR1(config)#
ESR1(config)# interface gigabitethernet 1/0/1.40
ESR1(config-subif)# ip firewall disable
ESR1(config-subif)# ip address 40.40.40.1/30
ESR1(config-subif)# ip ospf instance 1
ESR1(config-subif)# ip ospf
ESR1(config-subif)# exit
ESR1(config)#
ESR1(config)# system jumbo-frames
ESR1(config)# do commit
ESR1(config)# do confirmESR2
ESR2(config)# router ospf log-adjacency-changes
ESR2(config)# router ospf 1
ESR2(config-ospf)# router-id 2.2.2.2
ESR2(config-ospf)# area 0.0.0.0
ESR2(config-ospf-area)# enable
ESR2(config-ospf-area)# exit
ESR2(config-ospf)# enable
ESR2(config-ospf)# exit
ESR2(config)#
ESR2(config)# interface loopback 1
ESR2(config-loopback)# ip address 2.2.2.2/32
ESR2(config-loopback)# ip ospf instance 1
ESR2(config-loopback)# ip ospf
ESR2(config-loopback)# exit
ESR2(config)#
ESR2(config)# interface gigabitethernet 1/0/1.10
ESR2(config-subif)# ip firewall disable
ESR2(config-subif)# ip address 10.10.10.2/30
ESR2(config-subif)# ip ospf instance 1
ESR2(config-subif)# ip ospf
ESR2(config-subif)# exit
ESR2(config)#
ESR2(config)# interface gigabitethernet 1/0/1.20
ESR2(config-subif)# ip firewall disable
ESR2(config-subif)# ip address 20.20.20.2/30
ESR2(config-subif)# ip ospf instance 1
ESR2(config-subif)# ip ospf
ESR2(config-subif)# exit
ESR2(config)#
ESR2(config)# system jumbo-frames
ESR2(config)# do commit
ESR2(config)# do confirmESR3
ESR3(config)# router ospf log-adjacency-changes
ESR3(config)# router ospf 1
ESR3(config-ospf)# router-id 3.3.3.3
ESR3(config-ospf)# area 0.0.0.0
ESR3(config-ospf-area)# enable
ESR3(config-ospf-area)# exit
ESR3(config-ospf)# enable
ESR3(config-ospf)# exit
ESR3(config)#
ESR3(config)# interface loopback 1
ESR3(config-loopback)# ip address 3.3.3.3/32
ESR3(config-loopback)# ip ospf instance 1
ESR3(config-loopback)# ip ospf
ESR3(config-loopback)# exit
ESR3(config)#
ESR3(config)# interface gigabitethernet 1/0/1.20
ESR3(config-subif)# ip firewall disable
ESR3(config-subif)# ip address 20.20.20.1/30
ESR3(config-subif)# ip ospf instance 1
ESR3(config-subif)# ip ospf
ESR3(config-subif)# exit
ESR3(config)#
ESR3(config)# interface gigabitethernet 1/0/1.30
ESR3(config-subif)# ip firewall disable
ESR3(config-subif)# ip address 30.30.30.1/30
ESR3(config-subif)# ip ospf instance 1
ESR3(config-subif)# ip ospf
ESR3(config-subif)# exit
ESR3(config)#
ESR3(config)# system jumbo-frames
ESR3(config)# do commit
ESR3(config)# do confirmESR4
ESR4(config)# router ospf log-adjacency-changes
ESR4(config)# router ospf 1
ESR4(config-ospf)# router-id 4.4.4.4
ESR4(config-ospf)# area 0.0.0.0
ESR4(config-ospf-area)# enable
ESR4(config-ospf-area)# exit
ESR4(config-ospf)# enable
ESR4(config-ospf)# exit
ESR4(config)#
ESR4(config)# interface loopback 1
ESR4(config-loopback)# ip address 4.4.4.4/32
ESR4(config-loopback)# ip ospf instance 1
ESR4(config-loopback)# ip ospf
ESR4(config-loopback)# exit
ESR4(config)#
ESR4(config)# interface gigabitethernet 1/0/1.40
ESR4(config-subif)# ip firewall disable
ESR4(config-subif)# ip address 40.40.40.2/30
ESR4(config-subif)# ip ospf instance 1
ESR4(config-subif)# ip ospf
ESR4(config-subif)# exit
ESR4(config)#
ESR4(config)# interface gigabitethernet 1/0/1.30
ESR4(config-subif)# ip firewall disable
ESR4(config-subif)# ip address 30.30.30.2/30
ESR4(config-subif)# ip ospf instance 1
ESR4(config-subif)# ip ospf
ESR4(config-subif)# exit
ESR4(config)#
ESR4(config)# system jumbo-frames
ESR4(config)# do commit
ESR4(config)# do confirmIt is necessary to make sure that the OSPF protocol is running on each router:
ESR1# show ip ospf neighbors
Router ID Pri State DTime Interface Router IP
--------- --- ----- ----- ------------- ---------
2.2.2.2 128 Full/BDR 00:39 gi1/0/1.10 10.10.10.2
4.4.4.4 128 Full/BDR 00:32 gi1/0/1.40 40.40.40.2
ESR1# show ip ospf
O 40.40.40.0/30 [150/10] dev gi1/0/1.40 [ospf1 1970-01-08] (1.1.1.1)
O * 30.30.30.0/30 [150/20] via 40.40.40.2 on gi1/0/1.40 [ospf1 1970-01-08] (3.3.3.3)
O 1.1.1.1/32 [150/0] dev lo1 [ospf1 1970-01-08] (1.1.1.1)
O * 4.4.4.4/32 [150/10] via 40.40.40.2 on gi1/0/1.40 [ospf1 1970-01-08] (4.4.4.4)
O * 20.20.20.0/30 [150/20] via 10.10.10.2 on gi1/0/1.10 [ospf1 22:05:45] (3.3.3.3)
O 10.10.10.0/30 [150/10] dev gi1/0/1.10 [ospf1 22:05:33] (1.1.1.1)
O * 3.3.3.3/32 [150/20] multipath [ospf1 22:05:45] (3.3.3.3)
via 40.40.40.2 on gi1/0/1.40 weight 1
O * 2.2.2.2/32 [150/10] via 10.10.10.2 on gi1/0/1.10 [ospf1 22:05:45] (2.2.2.2)LDP configuration on the P/PE routers :
ESR1
ESR1# config
ESR1(config)# mpls
ESR1(config-mpls)# ldp
ESR1(config-ldp)# address-family ipv4
ESR1(config-ldp-af-ipv4)# transport-address 1.1.1.1
ESR1(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.10
ESR1(config-ldp-af-ipv4-if)# exit
ESR1(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.40
ESR1(config-ldp-af-ipv4-if)# exit
ESR1(config-ldp-af-ipv4)# exit
ESR1(config-ldp)# enable
ESR1(config-ldp)# exit
ESR1(config-mpls)# forwarding interface gigabitethernet 1/0/1.10
ESR1(config-mpls)# forwarding interface gigabitethernet 1/0/1.40
ESR1(config-mpls)# exit
ESR1(config)# do commit
ESR1(config)# do confirmESR2
ESR2# config
ESR2(config)# mpls
ESR2(config-mpls)# ldp
ESR2(config-ldp)# address-family ipv4
ESR2(config-ldp-af-ipv4)# transport-address 2.2.2.2
ESR2(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.10
ESR2(config-ldp-af-ipv4-if)# exit
ESR2(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.20
ESR2(config-ldp-af-ipv4-if)# exit
ESR2(config-ldp-af-ipv4)# exit
ESR2(config-ldp)# enable
ESR2(config-ldp)# exit
ESR2(config-mpls)# forwarding interface gigabitethernet 1/0/1.10
ESR2(config-mpls)# forwarding interface gigabitethernet 1/0/1.20
ESR2(config-mpls)# exit
ESR2(config)# do commit
ESR2(config)# do confirmESR3
ESR3# config
ESR3(config)# mpls
ESR3(config-mpls)# ldp
ESR3(config-ldp)# address-family ipv4
ESR3(config-ldp-af-ipv4)# transport-address 3.3.3.3
ESR3(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.20
ESR3(config-ldp-af-ipv4-if)# exit
ESR3(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.30
ESR3(config-ldp-af-ipv4-if)# exit
ESR3(config-ldp-af-ipv4)# exit
ESR3(config-ldp)# enable
ESR3(config-ldp)# exit
ESR3(config-mpls)# forwarding interface gigabitethernet 1/0/1.20
ESR3(config-mpls)# forwarding interface gigabitethernet 1/0/1.30
ESR3(config-mpls)# exit
ESR3(config)# do commit
ESR3(config)# do confirmESR4
ESR4# config
ESR4(config)# mpls
ESR4(config-mpls)# ldp
ESR4(config-ldp)# address-family ipv4
ESR4(config-ldp-af-ipv4)# transport-address 4.4.4.4
ESR4(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.30
ESR4(config-ldp-af-ipv4-if)# exit
ESR4(config-ldp-af-ipv4)# interface gigabitethernet 1/0/1.40
ESR4(config-ldp-af-ipv4-if)# exit
ESR4(config-ldp-af-ipv4)# exit
ESR4(config-ldp)# enable
ESR4(config-ldp)# exit
ESR4(config-mpls)# forwarding interface gigabitethernet 1/0/1.30
ESR4(config-mpls)# forwarding interface gigabitethernet 1/0/1.40
ESR4(config-mpls)# exit
ESR4(config)# do commit
ESR4(config)# do confirmOne of the following commands can be used to check the LDP convergence:
ESR1# show mpls ldp neighbor
Peer LDP ID: 2.2.2.2; Local LDP ID 1.1.1.1
State: Operational
TCP connection: 2.2.2.2:33933 - 1.1.1.1:646
Messages sent/received: 1059/1070
Uptime: 17:32:07
LDP discovery sources:
gigabitethernet 1/0/1.10
Peer LDP ID: 4.4.4.4; Local LDP ID 1.1.1.1
State: Operational
TCP connection: 4.4.4.4:40894 - 1.1.1.1:646
Messages sent/received: 1376/1386
Uptime: 22:38:38
LDP discovery sources:
gigabitethernet 1/0/1.40MP-BGP configuration
Create VRF on ESR1 and ESR3, respectively. Specify RD, rt-export/import in accordance with the scheme. Configure interface for interaction with CE (CE-SiteA и CE-SiteB). Additionally, create a route-map to allow BGP route announcements:
Without specifying RD and RT attributes the route information will not get into the VPNv4 table.
ESR1
ESR1(config)# ip vrf Customer1
ESR1(config-vrf)# ip protocols bgp max-routes 1000
ESR1(config-vrf)# rd 65500:100
ESR1(config-vrf)# route-target import 65500:100
ESR1(config-vrf)# route-target export 65500:100
ESR1(config-vrf)# exit
ESR1(config)# interface gigabitethernet 1/0/2
ESR1(config-if-gi)# ip vrf forwarding Customer1
ESR1(config-if-gi)# description "Customer1"
ESR1(config-if-gi)# ip firewall disable
ESR1(config-if-gi)# ip address 192.168.32.1/30
ESR1(config-if-gi)# exit
ESR1(config)# route-map OUTPUT
ESR1(config-route-map)# rule 1
ESR1(config-route-map-rule)# action permit
ESR1(config-route-map-rule)# exit
ESR1(config-route-map)# exit
ESR1(config)# do commit
ESR1(config)# do confirmESR3
ESR3(config)# ip vrf Customer1
ESR3(config-vrf)# ip protocols bgp max-routes 1000
ESR3(config-vrf)# rd 65500:100
ESR3(config-vrf)# route-target export 65500:100
ESR3(config-vrf)# route-target import 65500:100
ESR3(config-vrf)# exit
ESR3(config)# interface gigabitethernet 1/0/2
ESR3(config-if-gi)# ip vrf forwarding Customer1
ESR3(config-if-gi)# description "Customer1"
ESR3(config-if-gi)# ip firewall disable
ESR3(config-if-gi)# ip address 192.168.32.5/30
ESR3(config-if-gi)# exit
ESR3(config)# route-map OUTPUT
ESR3(config-route-map)# rule 1
ESR3(config-route-map-rule)# action permit
ESR3(config-route-map-rule)# exit
ESR3(config-route-map)# exit
ESR3(config)# do commit
ESR3(config)# do confirmConfigure iBGP between ESR1 and ESR3. Enable extended community sending on both devices.
ESR1
ESR1(config)# router bgp log-neighbor-changes
ESR1(config)# router bgp 65500
ESR1(config-bgp)# router-id 1.1.1.1
ESR1(config-bgp)# enable
ESR1(config-bgp)# neighbor 3.3.3.3
ESR1(config-bgp-neighbor)# remote-as 65500
ESR1(config-bgp-neighbor)# update-source 1.1.1.1
ESR1(config-bgp-neighbor)# enable
ESR1(config-bgp-neighbor)# address-family vpnv4 unicast
ESR1(config-bgp-neighbor-af)# send-community extended
ESR1(config-bgp-neighbor-af)# enable
ESR1(config-bgp-neighbor-af)# exit
ESR1(config-bgp-neighbor)# exit
ESR1(config-bgp)# exit
ESR1(config)# do commit
ESR1(config)# do confirmESR3
ESR3(config)# router bgp log-neighbor-changes
ESR3(config)# router bgp 65500
ESR3(config-bgp)# router-id 3.3.3.3
ESR3(config-bgp)# enable
ESR3(config-bgp)# neighbor 1.1.1.1
ESR3(config-bgp-neighbor)# remote-as 65500
ESR3(config-bgp-neighbor)# update-source 3.3.3.3
ESR3(config-bgp-neighbor)# enable
ESR3(config-bgp-neighbor)# address-family vpnv4 unicast
ESR3(config-bgp-neighbor-af)# send-community extended
ESR3(config-bgp-neighbor-af)# enable
ESR3(config-bgp-neighbor-af)# exit
ESR3(config-bgp-neighbor)# exit
ESR3(config-bgp)# exit
ESR3(config)# do commit
ESR3(config)# do confirmIt is necessary to make sure that BGP session is successfully established.
ESR1# show ip bgp neighbors
BGP neighbor is 3.3.3.3
BGP state: Established
Neighbor address: 3.3.3.3
Neighbor AS: 65500
Neighbor ID: 3.3.3.3
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: internal multihop AS4
Source address: 1.1.1.1
Weight: 0
Hold timer: 126/180
Keepalive timer: 40/60
Address family ipv4 unicast:
Default originate: No
Default information originate: No
Uptime: 88495 sPE-CE routing configuration
According to topology, Customer1 advertises a BGP(AS65505) subnet 10.100.0.0/24. Configure eBGP session between CE_SiteA and PE. Configure the corresponding interfaces, eBGP between ESR1 and CE_SiteA. It is also necessary to allow the announcement of routes towards the PE.
By default the route advertising is prohibited for EBGP, an allow rule must be configured. For IBGP route advertising is allowed.
Configuration on the CE-SiteA router:
CE _SiteA
CE-SiteA(config)# interface gigabitethernet 1/0/2
CE-SiteA(config-if-gi)# ip firewall disable
CE-SiteA(config-if-gi)# ip address 192.168.32.2/30
CE-SiteA(config-if-gi)# exit
CE-SiteA(config)# interface loopback 1
CE-SiteA(config-loopback)# ip address 10.100.0.1/24
CE-SiteA(config-loopback)# exit
CE-SiteA(config)# route-map OUTPUT
CE-SiteA(config-route-map)# rule 1
CE-SiteA(config-route-map-rule)# match ip address 10.100.0.0/24
CE-SiteA(config-route-map-rule)# action permit
CE-SiteA(config-route-map-rule)# exit
CE-SiteA(config-route-map)# exit
CE-SiteA(config)# router bgp log-neighbor-changes
CE-SiteA(config)# router bgp 65505
CE-SiteA(config-bgp)# router-id 192.168.32.1
CE-SiteA(config-bgp)# neighbor 192.168.32.1
CE-SiteA(config-bgp-neighbor)# remote-as 65500
CE-SiteA(config-bgp-neighbor)# allow-local-as 1
CE-SiteA(config-bgp-neighbor)# update-source 192.168.32.2
CE-SiteA(config-bgp-neighbor)# address-family ipv4 unicast
CE-SiteA(config-bgp-neighbor-af)# route-map OUTPUT out
CE-SiteA(config-bgp-neighbor-af)# enable
CE-SiteA(config-bgp-neighbor-af)# exit
CE-SiteA(config-bgp-neighbor)# enable
CE-SiteA(config-bgp-neighbor)# exit
CE-SiteA(config-bgp)# address-family ipv4 unicast
CE-SiteA(config-bgp-af)# network 10.100.0.0/24
CE-SiteA(config-bgp-af)# exit
CE-SiteA(config-bgp)# enable
CE-SiteA(config-bgp)# exit
CE-SiteA(config)# do commit
CE-SiteA(config)# do confirmConfigure eBGP on the ESR1 router.
Create eBGP session with CE_SiteA and allow routes transmission to the BGP peer:
ESR1
ESR1(config)# router bgp 65500
ESR1(config-bgp)# vrf Customer1
ESR1(config-bgp-vrf)# router-id 192.168.32.1
ESR1(config-bgp-vrf)# neighbor 192.168.32.2
ESR1(config-bgp-vrf-neighbor)# remote-as 65505
ESR1(config-bgp-vrf-neighbor)# update-source 192.168.32.1
ESR1(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR1(config-bgp-neighbor-af-vrf)# route-map OUTPUT out
ESR1(config-bgp-neighbor-af-vrf)# enable
ESR1(config-bgp-neighbor-af-vrf)# exit
ESR1(config-bgp-vrf-neighbor)# enable
ESR1(config-bgp-vrf-neighbor)# exit
ESR1(config-bgp-vrf)# address-family ipv4 unicast
ESR1(config-bgp-vrf-af)# redistribute connected
ESR1(config-bgp-vrf-af)# redistribute bgp 65500
ESR1(config-bgp-vrf-af)# exit
ESR1(config-bgp-vrf)# enable
ESR1(config-bgp-vrf)# exit
ESR1(config-bgp)# exit
ESR1(config)# do commit
ESR1(config)# do confirm When passing routes from VRF to the VPNv4 table of only connected and/or static networks, you do not need to specify the enable command. Enabling is required only if there are BGP peers in the VRF.
ESR1(config)# router bgp 65500
ESR1(config-bgp)# router-id 1.1.1.1
ESR1(config-bgp)# neighbor 3.3.3.3
ESR1(config-bgp-neighbor)# remote-as 65500
ESR1(config-bgp-neighbor)# update-source 1.1.1.1
ESR1(config-bgp-neighbor)# enable
ESR1(config-bgp-neighbor)# address-family vpnv4 unicast
ESR1(config-bgp-neighbor-af)# send-community extended
ESR1(config-bgp-neighbor-af)# enable
ESR1(config-bgp-neighbor-af)# exit
ESR1(config-bgp-neighbor)# exit
ESR1(config-bgp)# enable
EESR1(config-bgp)# vrf Customer1
ESR1(config-bgp-vrf)# address-family ipv4 unicast
ESR1(config-bgp-vrf-af)# redistribute connected
ESR1(config-bgp-vrf-af)# redistribute static
ESR1(config-bgp-vrf-af)# exit
ESR1(config-bgp-vrf)# exit
ESR1(config-bgp)# exit
ESR1(config)# do commit
ESR1(config)# do confirmThe following commands can be used to check the accepted and advertised routes:
ESR1# show bgp vpnv4 unicast vrf Customer1 neighbors 192.168.32.2 advertise-routes
Status codes: u - unicast, b - broadcast, m - multicast, a - anycast
* - valid, > - best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> u 10.100.1.0/24 192.168.32.1 100 65500 i
*> u 192.168.32.4/30 192.168.32.1 100 65500 iDisplay the advertised routes for a specific peer. The route information is displayed after the filtering is applied:
ESR1# show bgp vpnv4 unicast vrf Customer1 neighbors 192.168.32.2 routes
Status codes: u - unicast, b - broadcast, m - multicast, a - anycast
* - valid, > - best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> u 10.100.0.0/24 192.168.32.2 100 0 65505Output received routing information from a specific peer. Route information is displayed after filtering is applied.
CE_SiteB
Perform similar steps between ESR3 and CE_SiteB routers.
Configure the corresponding interfaces and create eBGP session between ESR3 and CE_SiteB:
CE_SiteB
CE-SiteB(config)# interface gigabitethernet 1/0/2
CE-SiteB(config-if-gi)# ip firewall disable
CE-SiteB(config-if-gi)# ip address 192.168.32.6/30
CE-SiteB(config-if-gi)# exit
CE-SiteB(config)#
CE-SiteB(config)# interface loopback 1
CE-SiteB(config-loopback)# ip address 10.100.1.1/24
CE-SiteB(config-loopback)# exit
CE-SiteB(config)#
CE-SiteB(config)# route-map OUTPUT
CE-SiteB(config-route-map)# rule 1
CE-SiteB(config-route-map-rule)# match ip address 10.100.1.0/24
CE-SiteB(config-route-map-rule)# action permit
CE-SiteB(config-route-map-rule)# exit
CE-SiteB(config-route-map)# exit
CE-SiteB(config)#
CE-SiteB(config)# router bgp 65505
CE-SiteB(config-bgp)# router-id 192.168.32.6
CE-SiteB(config-bgp)# neighbor 192.168.32.5
CE-SiteB(config-bgp-neighbor)# remote-as 65500
CE-SiteB(config-bgp-neighbor)# allow-local-as 1
CE-SiteB(config-bgp-neighbor)# update-source 192.168.32.6
CE-SiteB(config-bgp-neighbor)# address-family ipv4 unicast
CE-SiteB(config-bgp-neighbor-af)# route-map OUTPUT out
CE-SiteB(config-bgp-neighbor-af)# enable
CE-SiteB(config-bgp-neighbor-af)# exit
CE-SiteB(config-bgp-neighbor)# enable
CE-SiteB(config-bgp-neighbor)# exit
CE-SiteB(config-bgp)# address-family ipv4 unicast
CE-SiteB(config-bgp-af)# network 10.100.1.0/24
CE-SiteB(config-bgp-af)# exit
CE-SiteB(config-bgp)# enable
CE-SiteB(config-bgp)# exit
CE-SiteB(config)# do commit
CE-SiteB(config)# do confirm
Configure eBGP for ESR3 and allow transmission of routing information from VRF ro VPNv4 table:
ESR3
router bgp 65500
ESR3(config)# router bgp 65500
ESR3(config-bgp)# vrf Customer1
ESR3(config-bgp-vrf)# router-id 192.168.32.5
ESR3(config-bgp-vrf)# neighbor 192.168.32.6
ESR3(config-bgp-vrf-neighbor)# remote-as 65505
ESR3(config-bgp-vrf-neighbor)# update-source 192.168.32.5
ESR3(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR3(config-bgp-neighbor-af-vrf)# route-map OUTPUT out
ESR3(config-bgp-neighbor-af-vrf)# enable
ESR3(config-bgp-neighbor-af-vrf)# exit
ESR3(config-bgp-vrf-neighbor)# enable
ESR3(config-bgp-vrf-neighbor)# exit
ESR3(config-bgp-vrf)# address-family ipv4 unicast
ESR3(config-bgp-vrf-af)# redistribute connected
ESR3(config-bgp-vrf-af)# redistribute bgp 65500
ESR3(config-bgp-vrf-af)# exit
ESR3(config-bgp-vrf)# enable
ESR3(config-bgp-vrf)# exit
ESR3(config-bgp)# exit
ESR3(config)# do commit
ESR3(config)# do confirmThe following commands can be used to view the VPNv4 table:
ESR1# show ip bgp vpnv4 unicast all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher IP Prefix Next hop Metric Label LocPrf Weight Path
----- --------------------- ---------------- ------------ --------- ------- ---------- ------ -----
*> 65500:100 10.100.0.0/24 -- -- 23 -- -- ?
*>i 65500:100 192.168.32.4/30 3.3.3.3 -- 84 100 0 i
*>i 65500:100 10.100.1.0/24 3.3.3.3 -- 84 100 0 iThis command outputs all received VPNv4 routes after filtering is applied.
MPLS traffic balancing
ESR routers have a multi-core architecture. One of the first links in processing incoming traffic is the load balancer daemon (lbd), which performs two main functions:
- Distributes the load evenly among all router CPUs.
- Detects abnormal situations with high load on some CPUs, and redistributes processing from these CPUs to less loaded ones.
By default, lbd uses only MPLS tags to calculate the hash and then distribute the load to the different CPUs. This behavior is not always an advantage, especially when there are 'large' homogeneous streams of MPLS traffic. Additional functionality can be included to add entropy to the hash:
cpu load-balance mpls passenger ip
Enables possibility to 'look beyond' the MPLS header to find the IP header, and add ip-src and ip-dst to the hash calculation.
For L2VPN: search for a pair of ip-src and ip-dst in the ip header located behind the mpls header.
For L2VPN: ESR tries to look into the ethernet frame (which is behind the mpls header) and get the ip-src and ip-dst in the ip header to add to the hash calculation.
cpu load-balance mpls passenger ip-over-ethernet-pseudowire-with-cw
cpu load-balance mpls passenger ip-over-ethernet-pseudowire-without-cw
Allows to explicitly specify whether Control Word functionality is used when building L2VPN. Allows to prevent an error occurring when a package with Control Word present can be mistakenly recognized as a package without Control Word.
When hashing MPLS labels, the following restrictions apply:
- Labels 0-15 (Special-Purpose Labels) are not added to the calculation – see RFC 7274;
- A label is not added to the calculation if it is immediately preceded by label 15 (Extension Label) – see RFC 7274;
- No more than three tags are added to the hash calculation.
To avoid LDP session crash under heavy load on the CPU of the router on models ESR-200, ESR-1000, ESR-1200, ESR-1500, ESR-1700, after enabling the functionality, all LDP protocol packets will be processed by the control CPUs (Management CPU), which do not participate in traffic processing. For ESR-200, ESR-1000, ESR-1200, ESR-1500 is CPU 0, ESR-1700 is CPU 0-1.
Configuration example
Objective:
Enable L2VPN traffic balancing without using Control Word functionality.
Solution:
ESR
ESR(config)# system cpu load-balance mpls passenger ip
ESR(config)# system cpu load-balance mpls passenger ipoe-pw-without-cw
Operation with the bridge domain within MPLS
To organize L2VPN service, configure a bridge domain on the device, create the required AC, PW (LDP-signaling) and link all the necessary elements with this bridge domain.
For point-to-point, a bridge domain is created automatically.
Traffic is switched between elements of the bridge domain based on the listed rules:
- A MAC address table is automatically created for each bridge domain, similar to Ethernet switches. Ethernet frames are switched based on analysis of the destination MAC address (DST MAC).
- Frames with a known DST MAC will be sent to the appropriate AC/PW.
- Frames with unknown DST MAC, broadcast- and multicast-frames (so called BUM traffic, 'Broadcast, Unknown unicast and Multicast') will be sent to all elements of the bridge domain, except for the element (AC or PW) from which you entered the bridge domain.
- Switching takes into account the DST MAC in the frames, but does not take into account the VLAN tags present on the frames — thus, switching within a bridge domain is not 'VLAN-aware'.
In the current implementation, the bridge domain does not allow traffic of data link layer protocols such as STP, LLDP, CDP, etc.
The bridge domain can operate in two transport modes: ethernet or vlan. Transport mode sets the rules for handling traffic to and from the bridge domain.
In LDP signaling, ethernet mode (Raw mode, type 5) is used by default. A transport mode can be set for each individual VPLS instance.
In BGP signaling, the bridge domain only operate in ethernet mode.
PE1# config
PE1(config)# mpls
PE1(config-mpls)# l2vpn
PE1(config-l2vpn)# vpls MARTINI_br
PE1(config-l2vpn-vpls)# transport-mode vlan
PE1# sh mpls l2vpn pseudowire
Neighbor PW ID Sig Type Status
--------------------------------------- ---------- --- ---------- ------
10.10.0.2 200 LDP Eth Tagged Up In LDP signaling, the transport mode is matched between PEs during pseudowire creation, so it must match on both PEs.
Rules of the traffic processing are given below:
1. Ethernet (Raw) mode:
- If AC is a subinterface, the vlan tag is removed before putting it in the bridge. Upon leaving the bridge, the vlan tag is restored.
- If AC is an interface, then tagged and untagged traffic flows in both directions without modification.
PE1 and PE2 are configured in ethernet mode (Figure 2). On the PE1 side, gigabitethernet 1/0/4.100 subinterface is included in the bridge domain, so the vlan tag (vlan id 100) from incoming traffic will be removed before being placed in Pseudowire 10 (respectively, restored when traffic to the AC side). On the other side the AC on PE2, is an interface, which means that traffic will pass through without modification in either direction.
2. Vlan (Tagged) mode:
- If AC is a subinterface, the vlan tag is saved before putting it in the bridge. The vlan tag can be saved or overwritten depending on the configuration when you exit the bridge.
- If AC is an interface, traffic modification does not occur in either direction.
Assignment of MTU when operating with MPLS
It is very important to correctly configure the MTU parameter on the interfaces through which a packet is transmitted. This is true for the installation of the pseudowire and for the transmission of service traffic. There are two important moments:
- Sizes of the Ethernet header (18 bytes), inner tag (4bytes), outer tag (4 bytes) are not taken into account on the AC interfaces;
- On the interfaces participating in the forwarding of MPLS traffic, it is necessary to increase the MTU by the number of labels (each label is equal to 4 bytes).
MTU value is involved in signaling when constructing a pseudowire in both LDP-signaling and BGP-signaling. Examples for both cases are given below.
For signaling (LDP, BGP) the default MTU value is 1500.
The MTU values involved in signaling do not affect the actual packet size passing through the pseudowire.
In LDP-signaling, the MTU is set as part of the pw-class setting:
LDP-signaling. Configuration of MTU for matching
PE2(config)# mpls
PE2(config-mpls)# l2vpn
PE2(config-l2vpn)# pw-class MTU_example
PE2(config-l2vpn-pw-class)# encapsulation mpls mtu 9000
PE2(config-l2vpn-pw-class)# exit
PE2(config-mpls)# l2vpn
PE2(config-l2vpn)# vpls MTU_Example_PW
PE2(config-l2vpn-vpls)# pw 200 10.10.0.1
PE2(config-l2vpn-pw)# pw-class
PE2(config-l2vpn-pw)# pw-class MTU_example
*View created pw-classes*
PE2# sh mpls l2vpn pw-class
PW-class Neighbor PW ID Status Status-tlv MTU
-------------------------------- ---------- ---------- ------ ---------- ------
MTU_example 10.10.0.1 200 Up Enable 9000
PE2# sh mpls l2vpn vpls MTU_Example_PW
VPLS: MTU_Example_PW
...
PWs:
PW ID 2, Neighbor 10.10.0.1:
MTU: 9000
Last change: 01:27:42
Status: Up
* For PW 2 signaling of this VPLS MTU 9000 is selected*
In the figure above, PE1 raises two pseudowires: pseudowire 10 to PE2, and pseudowire 20 to PE3 respectively. For signaling with PE2, the MTU will be set to 2000 (pw-class TO_PE2), for PE3 the MTU will be equal to 3000 (pw-class TO_PE3).
For BGP-signaling, the MTU is specified as part of the l2vpn service configuration:
BGP -signaling. Configuration of MTU for matching
PE1(config)# mpls
PE1(config-mpls)# l2vpn
PE1(config-l2vpn)# vpls l2vpn_MTU
PE1(config-l2vpn-vpls)# autodiscovery bgp
PE1(config-bgp)# mtu 1500
PE2# sh mpls l2vpn vpls l2vpn_MTU
VPLS: l2vpn_MTU
...
PWs:
PW ID 2, Neighbor 10.10.0.1:
MTU: 1500
Last change: 01:27:42
Status: Up
* The MTU 1500 will be selected for signaling all pseudowires of this VPLS *If the MTU value is different when matching, the status of the pseudowire will be 'DOWN', 'Reason : MTU mismatch'.
PE1(config-l2vpn)# vpls l2vpn_MTU
PE1(config-l2vpn-vpls)# autodiscovery bgp
PE1(config-bgp)# mtu 2000
PE2# sh mpls l2vpn vpls l2vpn_MTU
...
PWs:
PW ID 2, Neighbor 10.10.0.1:
MTU: 2000
Last change: 00:00:10
Status: Down
Reason: MTU mismatch
MTU checking for BGP-signaling can be disabled:
PE1(config)# mpls
PE1(config-mpls)# l2vpn
PE1(config-l2vpn)# vpls l2vpn _MTU
PE1(config-l2vpn-vpls)# autodiscovery bgp
PE1(config-bgp)# ignore mtu-mismatchNow, when matching, the MTU value will be ignored.
By default, the bridge domain has an MTU of 1500 bytes. It is worth noting that bridge domain automatically selects the lowest MTU value based on its own MTU and the MTU of the interfaces included in the bridge domain.
* E.g., we have a bridge domain 100, which includes interfaces gi1/0/1 with MTU value 2000, and gi1/0/2 with MTU value 3000 *
CE3(config)# bridge 100
CE3(config-bridge)# enable
CE3(config-bridge)# exit
CE3(config)# interface gigabitethernet 1/0/1
CE3(config-if-gi)# mtu 2000
CE3(config-if-gi)# bridge-group 100
CE3(config-if-gi)# exit
CE3(config)# interface gigabitethernet 1/0/2
CE3(config-if-gi)# mtu 3000
CE3(config-if-gi)# bridge-group 100
CE3(config-if-gi)# do com
* The MTU of the bridge domain will be 1500, since the bridge itself has a default MTU of 1500 (the default value), which has become the lowest:
MTU bridge 100 = 1500 <-- The lowest MTU value
MTU gi1/0/1 = 2000
MTU gi1/0/2 = 3000
*
CE3# sh interfaces bridge
Bridges Interfaces
---------- --------------------------------------------------------------
bridge 100 gi1/0/1-2
CE3# sh interfaces status bridge 100
Interface 'bridge 100' status information:
Description: --
Operational state: UP
Administrative state: Up
Supports broadcast: Yes
Supports multicast: Yes
MTU: 1500
MAC address: a8:f9:4b:aa:11:00
Last change: 1 minute and 46 seconds
Mode: Routerport
* Change the MTU on the bridge domain itself: *
CE3(config)# bridge 100
CE3(config-bridge)# mtu 6000
CE3(config-bridge)# do com
* The MTU of the bridge domain became 2000 bytes, because gi1/0/2 has the lowest MTU:
MTU bridge 100 = 6000
MTU gi1/0/1 = 2000 <-- The lowest MTU value
MTU gi1/0/2 = 3000
*
CE3# sh interfaces bridge
Bridges Interfaces
---------- --------------------------------------------------------------
bridge 100 gi1/0/1-2
CE3# sh interfaces status bridge 100
Interface 'bridge 100' status information:
Description: --
Operational state: Up
Administrative state: Up
Supports broadcast: Yes
Supports multicast: Yes
MTU: 2000
MAC address: a8:f9:4b:aa:11:00
Last change: 6 minutes and 42 seconds
Mode: Routerport
Consider the example of traffic passing through the L2VPN service:
PE1 has the following MTU values on the interfaces:
PE1# sh interfaces status
Interface Admin Link MTU MAC address Last change Mode
state state
---------- ----- ----- ------ ------------------ ------------------------- ----------
gi1/0/1 Up Up 9000 a8:f9:4b:ac:4d:16 5 hours, 25 minutes and 2 Routerport
seconds
gi1/0/2 Up Up 1500 a8:f9:4b:ac:4d:17 4 days, 4 hours, 49 Switchport
minutes and 40 seconds
gi1/0/3 Up Up 1800 a8:f9:4b:ac:4d:18 4 days, 1 hour, 49 Switchport
minutes and 38 seconds
bridge 2 Up Up 1500 a8:f9:4b:ac:4d:15 1 day, 1 hour, 27 minutes Routerport
and 28 seconds
CE1 sends packets of 1500 bytes, CE2 sends packets of 1800 bytes respectively. Since the MTU of the bridge domain is smaller than the MTU of the packet from CE2, the packet from CE2 will be discarded before hitting the bridge domain. Similar will be the case if the MTU interface facing the mpls-core (gi1/0/1) is less than the MTU coming from the CE packets (taking into account the mpls header).
Similar behavior when passing traffic in the L3VPN service:
If CE1 sends a packet with a higher MTU than on the interface facing the client (gi1/0/2) or towards the mpls-core (gi1/0/1), the packet will be discarded.
Inter-AS Option A
This section provides examples of configuration based on the construction of l3vpn and l2vpn services. The main feature of inter-AS Option A is the absence of mpls-tags in traffic when transferring between ABSR. To separate client service traffic between ASBRs, VRF is usually used for l3vpn or tagging (dot1q, q-in-q) for l2vpn services.
L2VPN
CE configuration:
СE1
ESR# config
ESR(config)# hostname CE1
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 192.168.1.1/24
ESR(config-if-gi)# do com
ESR(config-if-gi)# do conf
СЕ2
ESR# config
ESR(config)# hostname CE2
ESR(config)# interface gigabitethernet 1/0/1.200
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 192.168.2.1/24
ESR(config-if-gi)# do com
ESR(config-if-gi)# do confСЕ3
ESR# config
ESR(config)# hostname CE3
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 192.168.1.2/24
ESR(config-if-gi)# do com
ESR(config-if-gi)# do confСЕ4
ESR# config
ESR(config)# hostname CE4
ESR(config)# interface gigabitethernet 1/0/1.200
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 192.168.2.2/24
ESR(config-if-gi)# do com
ESR(config-if-gi)# do confConfigure PE1 and PE2. Assign service labels advertising to BGP (Kompella mode):
PE1
ESR(config)# hostname PE1
ESR(config)# system jumbo-frames
ESR(config)# router bgp log-neighbor-changes
ESR(config)# router bgp 65500
ESR(config-bgp)# neighbor 10.10.1.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.10.1.1
ESR(config-bgp-neighbor)# address-family l2vpn vpls
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# bridge 100
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)# bridge 200
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# description "to CE1"
ESR(config-subif)# bridge-group 100
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/1.200
ESR(config-subif)# description "to CE2"
ESR(config-subif)# bridge-group 200
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.100.0.1/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.10.1.1/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.10.1.1
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# l2vpn
ESR(config-l2vpn)# vpls CE1
ESR(config-l2vpn-vpls)# bridge-group 100
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 1
ESR(config-bgp)# ve id 2
ESR(config-bgp)# rd 65500:1
ESR(config-bgp)# route-target export 65500:1
ESR(config-bgp)# route-target import 65500:1
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# vpls CE2
ESR(config-l2vpn-vpls)# bridge-group 200
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 2
ESR(config-bgp)# ve id 2
ESR(config-bgp)# rd 65500:2
ESR(config-bgp)# route-target export 65500:2
ESR(config-bgp)# route-target import 65500:2
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do confPE2
ESR(config)# hostname ESR
ESR(config)# system jumbo-frames
ESR(config)#
ESR(config)# router bgp log-neighbor-changes
ESR(config)# router bgp 65500
ESR(config-bgp)# router-id 10.11.1.1
ESR(config-bgp)# neighbor 10.11.1.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.11.1.1
ESR(config-bgp-neighbor)# address-family l2vpn vpls
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# bridge 100
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)# bridge 200
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# description "to CE3"
ESR(config-subif)# bridge-group 100
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/1.200
ESR(config-subif)# description "to CE4"
ESR(config-subif)# bridge-group 200
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.101.0.1/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.11.1.1/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.11.1.1
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# l2vpn
ESR(config-l2vpn)# vpls CE1
ESR(config-l2vpn-vpls)# bridge-group 100
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 1
ESR(config-bgp)# ve id 2
ESR(config-bgp)# rd 65500:1
ESR(config-bgp)# route-target export 65500:1
ESR(config-bgp)# route-target import 65500:1
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# vpls CE2
ESR(config-l2vpn-vpls)# bridge-group 200
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 2
ESR(config-bgp)# ve id 2
ESR(config-bgp)# rd 65500:2
ESR(config-bgp)# route-target export 65500:2
ESR(config-bgp)# route-target import 65500:2
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do confConfigure ASBR1 and ASBR2. To separate traffic from CE1 and CE2 towards ASBR2, make the gi1/0/1 interface as trunk. Vlan 100 and 200 will be dedicated to traffic from CE1 and CE2:
ASBR1
ESR(config)# hostname ASBR1
ESR(config)#
ESR(config)# system jumbo-frames
ESR(config)#
ESR(config)# vlan 100,200
ESR(config-vlan)# exit
ESR(config)#
ESR(config)# router bgp 65500
ESR(config-bgp)# router-id 10.10.1.2
ESR(config-bgp)# neighbor 10.10.1.1
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.10.1.2
ESR(config-bgp-neighbor)# address-family l2vpn vpls
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# bridge 10
ESR(config-bridge)# vlan 100
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)# bridge 20
ESR(config-bridge)# vlan 200
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1
ESR(config-if-gi)# description "to ASBR2"
ESR(config-if-gi)# mode switchport
ESR(config-if-gi)# spanning-tree disable
ESR(config-if-gi)# switchport forbidden default-vlan
ESR(config-if-gi)# switchport mode trunk
ESR(config-if-gi)# switchport trunk allowed vlan add 100,200
ESR(config-if-gi)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# description "to PE1"
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.100.0.2/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.10.1.2/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.10.1.2
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# l2vpn
ESR(config-l2vpn)# vpls CE1
ESR(config-l2vpn-vpls)# bridge-group 10
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 1
ESR(config-bgp)# ve id 1
ESR(config-bgp)# rd 65500:1
ESR(config-bgp)# route-target export 65500:1
ESR(config-bgp)# route-target import 65500:1
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# vpls CE2
ESR(config-l2vpn-vpls)# bridge-group 20
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 2
ESR(config-bgp)# ve id 1
ESR(config-bgp)# rd 65500:2
ESR(config-bgp)# route-target export 65500:2
ESR(config-bgp)# route-target import 65500:2
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do conf
ASBR2
ESR(config)# hostname ASBR2
ESR(config)#
ESR(config)# system jumbo-frames
ESR(config)#
ESR(config)# vlan 100,200
ESR(config-vlan)# exit
ESR(config)#
ESR(config)# router bgp 65500
ESR(config-bgp)# router-id 10.10.1.2
ESR(config-bgp)# neighbor 10.10.1.1
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.10.1.2
ESR(config-bgp-neighbor)# address-family l2vpn vpls
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# bridge 10
ESR(config-bridge)# vlan 100
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)# bridge 20
ESR(config-bridge)# vlan 200
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1
ESR(config-if-gi)# description "to ASBR1"
ESR(config-if-gi)# mode switchport
ESR(config-if-gi)# spanning-tree disable
ESR(config-if-gi)# switchport forbidden default-vlan
ESR(config-if-gi)# switchport mode trunk
ESR(config-if-gi)# switchport trunk allowed vlan add 100,200
ESR(config-if-gi)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# description "to PE1"
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.100.0.2/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.10.1.2/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.10.1.2
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# l2vpn
ESR(config-l2vpn)# vpls CE1
ESR(config-l2vpn-vpls)# bridge-group 10
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 1
ESR(config-bgp)# ve id 1
ESR(config-bgp)# rd 65500:1
ESR(config-bgp)# route-target export 65500:1
ESR(config-bgp)# route-target import 65500:1
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# vpls CE2
ESR(config-l2vpn-vpls)# bridge-group 20
ESR(config-l2vpn-vpls)# autodiscovery bgp
ESR(config-bgp)# vpn id 2
ESR(config-bgp)# ve id 1
ESR(config-bgp)# rd 65500:2
ESR(config-bgp)# route-target export 65500:2
ESR(config-bgp)# route-target import 65500:2
ESR(config-bgp)# exit
ESR(config-l2vpn-vpls)# enable
ESR(config-l2vpn-vpls)# exit
ESR(config-l2vpn)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do conf
Check label assignment, service status, and network availability between CEs:
Labels information
ASBR2# sh bgp l2vpn vpls all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher VID VBO VBS Next hop Metric LocPrf Weight Path
----- --------------------- ----- ----- ----- --------------- ---------- ---------- ------ -----
*>i 65500:1 2 1 10 10.11.1.1 -- 100 0 i
*>i 65500:2 2 1 10 10.11.1.1 -- 100 0 i
*> 65500:1 1 1 10 -- -- -- --
*> 65500:2 1 1 10 -- -- -- --
ASBR2# sh mpls forwarding-table
Local Outgoing Prefix Outgoing Next Hop
label label or tunnel ID Interface
-------- -------- ------------------------------------------- ---------------- -----------
56 imp-null 10.11.1.1/32 gi1/0/2 10.101.0.1
47 37 PW ID 1 -- 10.11.1.1
37 47 PW ID 2 -- 10.11.1.1
Status of services
ASBR2# sh mpls l2vpn vpls
VPLS: CE1
bridge 10:
MTU: 1500
Status: Up
PWs:
PW ID 1, Neighbor 10.11.1.1:
MTU: 1500
Last change: 00:16:59
Status: Up
VPLS: CE2
bridge 20:
MTU: 1500
Status: Up
PWs:
PW ID 2, Neighbor 10.11.1.1:
MTU: 1500
Last change: 00:16:59
Status: Up
Checking network availability
CE1# ping 192.168.1.2 detailed
PING 192.168.1.2 (192.168.1.2) 56 bytes of data.
64 bytes from 192.168.1.2: icmp_seq=1 ttl=0 time=1.08 ms
64 bytes from 192.168.1.2: icmp_seq=2 ttl=0 time=1.06 ms
64 bytes from 192.168.1.2: icmp_seq=3 ttl=0 time=1.01 ms
64 bytes from 192.168.1.2: icmp_seq=4 ttl=0 time=0.971 ms
64 bytes from 192.168.1.2: icmp_seq=5 ttl=0 time=0.972 ms
CE2# ping 192.168.2.2 detailed packets
PING 192.168.2.2 (192.168.2.2) 56 bytes of data.
64 bytes from 192.168.2.2: icmp_seq=1 ttl=0 time=1.17 ms
64 bytes from 192.168.2.2: icmp_seq=2 ttl=0 time=0.972 ms
64 bytes from 192.168.2.2: icmp_seq=3 ttl=0 time=0.960 ms
64 bytes from 192.168.2.2: icmp_seq=4 ttl=0 time=1.04 ms
64 bytes from 192.168.2.2: icmp_seq=5 ttl=0 time=0.976 ms
ASBR2# sh mac address-table bridge 10
VID MAC Address Interface Type
----- ------------------ ------------------------------ -------
-- e4:5a:d4:01:b9:73 vlan 100 Dynamic
-- e4:5a:d4:a1:34:61 dypseudowire 1_10.11.1.1 Dynamic
2 valid mac entries
ASBR2# sh mac address-table bridge 20
VID MAC Address Interface Type
----- ------------------ ------------------------------ -------
-- e4:5a:d4:01:c1:80 vlan 200 Dynamic
-- e4:5a:d4:a1:34:61 dypseudowire 2_10.11.1.1 Dynamic
2 valid mac entries
L3VPN
Configure CE:
СE1
ESR(config)# hostname CE1
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.1.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.110.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.1.1/30
ESR(config-subif)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.110.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do conf
СE2
ESR(config)# hostname CE2
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.2.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.112.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.2.1/30
ESR(config-subif)# exit
ESR(config)#
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.112.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do confСE3
ESR(config)# hostname CE3
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.3.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.113.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.3.1/30
ESR(config-subif)# exit
ESR(config)#
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.113.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do conf
СE4
ESR(config)# hostname CE4
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.4.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.114.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.4.1/30
ESR(config-subif)# exit
ESR(config)#
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.114.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do conf
Configure PE1 and PE2:
PE1
ESR(config)# hostname PE1
ESR(config)#
ESR(config)# ip vrf CE1
ESR(config-vrf)# ip protocols bgp max-routes 100
ESR(config-vrf)# rd 65500:1
ESR(config-vrf)# route-target export 65500:1
ESR(config-vrf)# route-target import 65500:1
ESR(config-vrf)# exit
ESR(config)# ip vrf CE2
ESR(config-vrf)# ip protocols bgp max-routes 100
ESR(config-vrf)# rd 65500:2
ESR(config-vrf)# route-target export 65500:2
ESR(config-vrf)# route-target import 65500:2
ESR(config-vrf)# exit
ESR(config)#
ESR(config)# system jumbo-frames
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp log-neighbor-changes
ESR(config)# router bgp 65500
ESR(config-bgp)# neighbor 10.10.1.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.10.1.1
ESR(config-bgp-neighbor)# address-family vpnv4 unicast
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# vrf CE1
ESR(config-bgp-vrf)# neighbor 192.168.1.1
ESR(config-bgp-vrf-neighbor)# remote-as 65501
ESR(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af-vrf)# route-map BGP out
ESR(config-bgp-neighbor-af-vrf)# enable
ESR(config-bgp-neighbor-af-vrf)# exit
ESR(config-bgp-vrf-neighbor)# enable
ESR(config-bgp-vrf-neighbor)# exit
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# enable
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# vrf CE2
ESR(config-bgp-vrf)# neighbor 192.168.2.1
ESR(config-bgp-vrf-neighbor)# remote-as 65501
ESR(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af-vrf)# route-map BGP out
ESR(config-bgp-neighbor-af-vrf)# enable
ESR(config-bgp-neighbor-af-vrf)# exit
ESR(config-bgp-vrf-neighbor)# enable
ESR(config-bgp-vrf-neighbor)# exit
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# enable
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip vrf forwarding CE1
ESR(config-subif)# description "to CE1"
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.1.2/30
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/1.200
ESR(config-subif)# ip vrf forwarding CE2
ESR(config-subif)# description "to CE2"
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.2.2/30
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.100.0.1/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.10.1.1/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.10.1.1
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do confPE2
ESR(config)# hostname PE2
ESR(config)#
ESR(config)# ip vrf CE1
ESR(config-vrf)# ip protocols bgp max-routes 100
ESR(config-vrf)# rd 65500:1
ESR(config-vrf)# route-target export 65500:1
ESR(config-vrf)# route-target import 65500:1
ESR(config-vrf)# exit
ESR(config)# ip vrf CE2
ESR(config-vrf)# ip protocols bgp max-routes 100
ESR(config-vrf)# rd 65500:2
ESR(config-vrf)# route-target export 65500:2
ESR(config-vrf)# route-target import 65500:2
ESR(config-vrf)# exit
ESR(config)#
ESR(config)# system jumbo-frames
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp log-neighbor-changes
ESR(config)# router bgp 65500
ESR(config-bgp)# router-id 10.11.1.1
ESR(config-bgp)# neighbor 10.11.1.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.11.1.1
ESR(config-bgp-neighbor)# address-family vpnv4 unicast
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# vrf CE1
ESR(config-bgp-vrf)# neighbor 192.168.3.1
ESR(config-bgp-vrf-neighbor)# remote-as 65501
ESR(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af-vrf)# route-map BGP out
ESR(config-bgp-neighbor-af-vrf)# enable
ESR(config-bgp-neighbor-af-vrf)# exit
ESR(config-bgp-vrf-neighbor)# enable
ESR(config-bgp-vrf-neighbor)# exit
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# enable
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# vrf CE2
ESR(config-bgp-vrf)# neighbor 192.168.4.1
ESR(config-bgp-vrf-neighbor)# remote-as 65501
ESR(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af-vrf)# route-map BGP out
ESR(config-bgp-neighbor-af-vrf)# enable
ESR(config-bgp-neighbor-af-vrf)# exit
ESR(config-bgp-vrf-neighbor)# enable
ESR(config-bgp-vrf-neighbor)# exit
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# enable
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip vrf forwarding CE1
ESR(config-subif)# description "to CE3"
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.3.2/30
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/1.200
ESR(config-subif)# ip vrf forwarding CE2
ESR(config-subif)# description "to CE4"
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.4.2/30
ESR(config-subif)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.101.0.1/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.11.1.1/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.11.1.1
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do confConfigure ASBR1 and ASBR2. To transfer routing information between them, use the OSPF protocol in the corresponding VRFs:
ASBR1
ESR(config)# hostname ASBR1
ESR(config)#
ESR(config)# ip vrf CE1
ESR(config-vrf)# ip protocols ospf max-routes 100
ESR(config-vrf)# rd 65500:1
ESR(config-vrf)# route-target export 65500:1
ESR(config-vrf)# route-target import 65500:1
ESR(config-vrf)# exit
ESR(config)# ip vrf CE2
ESR(config-vrf)# ip protocols ospf max-routes 100
ESR(config-vrf)# rd 65500:2
ESR(config-vrf)# route-target export 65500:2
ESR(config-vrf)# route-target import 65500:2
ESR(config-vrf)# exit
ESR(config)#
ESR(config)# system jumbo-frames
ESR(config)#
ESR(config)# vlan 100,200
ESR(config-vlan)# exit
ESR(config)#
ESR(config)# router bgp 65500
ESR(config-bgp)# router-id 10.10.1.2
ESR(config-bgp)# neighbor 10.10.1.1
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.10.1.2
ESR(config-bgp-neighbor)# address-family vpnv4 unicast
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# vrf CE1
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute ospf 1 intra-area inter-area external1 external2
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# vrf CE2
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute ospf 1 intra-area inter-area external1 external2
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf log-adjacency-changes
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)# router ospf 1 vrf CE1
ESR(config-ospf)# redistribute bgp 65500
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)# router ospf 1 vrf CE2
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# bridge 10
ESR(config-bridge)# ip vrf forwarding CE1
ESR(config-bridge)# vlan 100
ESR(config-bridge)# ip firewall disable
ESR(config-bridge)# ip address 172.16.32.1/30
ESR(config-bridge)# ip ospf instance 1
ESR(config-bridge)# ip ospf
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)# bridge 20
ESR(config-bridge)# ip vrf forwarding CE2
ESR(config-bridge)# vlan 200
ESR(config-bridge)# ip firewall disable
ESR(config-bridge)# ip address 172.16.32.5/30
ESR(config-bridge)# ip ospf instance 1
ESR(config-bridge)# ip ospf
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1
ESR(config-if-gi)# description "to ASBR2"
ESR(config-if-gi)# mode switchport
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# spanning-tree disable
ESR(config-if-gi)# switchport forbidden default-vlan
ESR(config-if-gi)# switchport mode trunk
ESR(config-if-gi)# switchport trunk allowed vlan add 100,200
ESR(config-if-gi)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# description "to PE1"
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.100.0.2/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.10.1.2/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.10.1.2
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do confASBR2
ESR(config)# hostname ASBR2
ESR(config)#
ESR(config)# ip vrf CE1
ESR(config-vrf)# ip protocols ospf max-routes 100
ESR(config-vrf)# rd 65500:1
ESR(config-vrf)# route-target export 65500:1
ESR(config-vrf)# route-target import 65500:1
ESR(config-vrf)# exit
ESR(config)# ip vrf CE2
ESR(config-vrf)# ip protocols ospf max-routes 100
ESR(config-vrf)# rd 65500:2
ESR(config-vrf)# route-target export 65500:2
ESR(config-vrf)# route-target import 65500:2
ESR(config-vrf)# exit
ESR(config)#
ESR(config)# system jumbo-frames
ESR(config)#
ESR(config)# vlan 100,200
ESR(config-vlan)# exit
ESR(config)#
ESR(config)# router bgp 65500
ESR(config-bgp)# router-id 10.11.1.2
ESR(config-bgp)# neighbor 10.11.1.1
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# update-source 10.11.1.2
ESR(config-bgp-neighbor)# address-family vpnv4 unicast
ESR(config-bgp-neighbor-af)# send-community extended
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# vrf CE1
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute ospf 1 intra-area inter-area external1 external2
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# vrf CE2
ESR(config-bgp-vrf)# address-family ipv4 unicast
ESR(config-bgp-vrf-af)# redistribute ospf 1 intra-area inter-area external1 external2
ESR(config-bgp-vrf-af)# exit
ESR(config-bgp-vrf)# exit
ESR(config-bgp)# exit
ESR(config)#
ESR(config)# router ospf log-adjacency-changes
ESR(config)# router ospf 1
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)# router ospf 1 vrf CE1
ESR(config-ospf)# redistribute bgp 65500
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)# router ospf 1 vrf CE2
ESR(config-ospf)# redistribute bgp 65500
ESR(config-ospf)# area 0.0.0.0
ESR(config-ospf-area)# enable
ESR(config-ospf-area)# exit
ESR(config-ospf)# enable
ESR(config-ospf)# exit
ESR(config)#
ESR(config)# bridge 10
ESR(config-bridge)# ip vrf forwarding CE1
ESR(config-bridge)# vlan 100
ESR(config-bridge)# ip firewall disable
ESR(config-bridge)# ip address 172.16.32.2/30
ESR(config-bridge)# ip ospf instance 1
ESR(config-bridge)# ip ospf
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)# bridge 20
ESR(config-bridge)# ip vrf forwarding CE2
ESR(config-bridge)# vlan 200
ESR(config-bridge)# ip firewall disable
ESR(config-bridge)# ip address 172.16.32.6/30
ESR(config-bridge)# ip ospf instance 1
ESR(config-bridge)# ip ospf
ESR(config-bridge)# enable
ESR(config-bridge)# exit
ESR(config)#
ESR(config)# interface gigabitethernet 1/0/1
ESR(config-if-gi)# description "to ASBR1"
ESR(config-if-gi)# mode switchport
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# spanning-tree disable
ESR(config-if-gi)# switchport forbidden default-vlan
ESR(config-if-gi)# switchport mode trunk
ESR(config-if-gi)# switchport trunk allowed vlan add 100,200
ESR(config-if-gi)# exit
ESR(config)# interface gigabitethernet 1/0/2
ESR(config-if-gi)# description "to PE2"
ESR(config-if-gi)# mtu 1522
ESR(config-if-gi)# ip firewall disable
ESR(config-if-gi)# ip address 10.101.0.2/30
ESR(config-if-gi)# ip ospf instance 1
ESR(config-if-gi)# ip ospf
ESR(config-if-gi)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.11.1.2/32
ESR(config-loopback)# ip ospf instance 1
ESR(config-loopback)# ip ospf
ESR(config-loopback)# exit
ESR(config)# mpls
ESR(config-mpls)# ldp
ESR(config-ldp)# router-id 10.11.1.2
ESR(config-ldp)# address-family ipv4
ESR(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ESR(config-ldp-af-ipv4-if)# exit
ESR(config-ldp-af-ipv4)# exit
ESR(config-ldp)# enable
ESR(config-ldp)# exit
ESR(config-mpls)# forwarding interface gigabitethernet 1/0/2
ESR(config-mpls)# exit
ESR(config)# do com
ESR(config)# do confConfiguration is completed. Check distribution of routing information and network availability of nodes:
PE1# sh bgp vpnv4 unicast all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher IP Prefix Next hop Metric Label LocPrf Weight Path
----- --------------------- ------------------ --------------- ---------- ------- ---------- ------ ----------------
*> 65500:1 10.110.0.1/32 -- -- 37 100 -- 65501 i
*> 65500:1 10.111.0.1/32 -- -- 35 100 -- 65501 i
*>i 65500:1 10.113.0.1/32 10.10.1.2 -- 43 100 0 ?
*>i 65500:1 10.114.0.1/32 10.10.1.2 -- 48 100 0 ?
CE1# ping 10.113.0.1 source ip 10.110.0.1 detailed
PING 10.113.0.1 (10.113.0.1) from 10.110.0.1 : 56 bytes of data.
64 bytes from 10.113.0.1: icmp_seq=1 ttl=0 time=1.31 ms
64 bytes from 10.113.0.1: icmp_seq=2 ttl=0 time=1.14 ms
64 bytes from 10.113.0.1: icmp_seq=3 ttl=0 time=1.08 ms
64 bytes from 10.113.0.1: icmp_seq=4 ttl=0 time=1.06 ms
64 bytes from 10.113.0.1: icmp_seq=5 ttl=0 time=1.16 ms
Inter-AS Option B
Unlike Option A, there is no need to use VRF between ASBRs: when passing traffic between ASBRs, an MPLS label will be assigned. This scheme has the best scalability.
In the current implementation, Option B is only supported for VPN-IPv4 routes (AFI = 1, SAFI = 128).
L3VPN
Configure CE:
СE1
ESR(config)# hostname CE1
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.1.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.110.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.1.1/30
ESR(config-subif)# exit
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.110.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do confCE2
ESR(config)# hostname CE2
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.2.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.112.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.2.1/30
ESR(config-subif)# exit
ESR(config)#
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.112.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do confCE3
ESR(config)# hostname CE3
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.3.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.113.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.3.1/30
ESR(config-subif)# exit
ESR(config)#
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.113.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do confCE4
ESR(config)# hostname CE4
ESR(config)#
ESR(config)# route-map BGP
ESR(config-route-map)# rule 1
ESR(config-route-map-rule)# exit
ESR(config-route-map)# exit
ESR(config)# router bgp 65501
ESR(config-bgp)# neighbor 192.168.4.2
ESR(config-bgp-neighbor)# remote-as 65500
ESR(config-bgp-neighbor)# address-family ipv4 unicast
ESR(config-bgp-neighbor-af)# route-map BGP out
ESR(config-bgp-neighbor-af)# enable
ESR(config-bgp-neighbor-af)# exit
ESR(config-bgp-neighbor)# enable
ESR(config-bgp-neighbor)# exit
ESR(config-bgp)# address-family ipv4 unicast
ESR(config-bgp-af)# network 10.114.0.1/32
ESR(config-bgp-af)# exit
ESR(config-bgp)# enable
ESR(config-bgp)# exit
ESR(config)# interface gigabitethernet 1/0/1.100
ESR(config-subif)# ip firewall disable
ESR(config-subif)# ip address 192.168.4.1/30
ESR(config-subif)# exit
ESR(config)#
ESR(config)# interface loopback 1
ESR(config-loopback)# ip address 10.114.0.1/32
ESR(config-loopback)# exit
ESR(config)# do com
ESR(config)# do confConfigure PE1 and PE2:
PE1
PE1(config)# hostname PE1
PE1(config)#
PE1(config)# ip vrf CE1
PE1(config-vrf)# ip protocols bgp max-routes 100
PE1(config-vrf)# rd 65501:1
PE1(config-vrf)# route-target export 65501:1
PE1(config-vrf)# route-target import 65501:1
PE1(config-vrf)# exit
PE1(config)# ip vrf CE2
PE1(config-vrf)# ip protocols bgp max-routes 100
PE1(config-vrf)# rd 65501:2
PE1(config-vrf)# route-target export 65501:2
PE1(config-vrf)# route-target import 65501:2
PE1(config-vrf)# exit
PE1(config)#
PE1(config)# system jumbo-frames
PE1(config)#
PE1(config)# route-map BGP_OUT
PE1(config-route-map)# rule 1
PE1(config-route-map-rule)# exit
PE1(config-route-map)# exit
PE1(config)# router bgp 65501
PE1(config-bgp)# neighbor 10.10.1.2
PE1(config-bgp-neighbor)# remote-as 65501
PE1(config-bgp-neighbor)# update-source 10.10.1.1
PE1(config-bgp-neighbor)# address-family vpnv4 unicast
PE1(config-bgp-neighbor-af)# send-community extended
PE1(config-bgp-neighbor-af)# enable
PE1(config-bgp-neighbor-af)# exit
PE1(config-bgp-neighbor)# enable
PE1(config-bgp-neighbor)# exit
PE1(config-bgp)# enable
PE1(config-bgp)# vrf CE1
PE1(config-bgp-vrf)# neighbor 192.168.1.1
PE1(config-bgp-vrf-neighbor)# remote-as 65510
PE1(config-bgp-vrf-neighbor)# address-family ipv4 unicast
PE1(config-bgp-neighbor-af-vrf)# route-map BGP_OUT out
PE1(config-bgp-neighbor-af-vrf)# enable
PE1(config-bgp-neighbor-af-vrf)# exit
PE1(config-bgp-vrf-neighbor)# enable
PE1(config-bgp-vrf-neighbor)# exit
PE1(config-bgp-vrf)# address-family ipv4 unicast
PE1(config-bgp-vrf-af)# redistribute bgp 65501 route-map BGP_OUT
PE1(config-bgp-vrf-af)# exit
PE1(config-bgp-vrf)# enable
PE1(config-bgp-vrf)# exit
PE1(config-bgp)# vrf CE2
PE1(config-bgp-vrf)# neighbor 192.168.2.1
PE1(config-bgp-vrf-neighbor)# remote-as 65511
PE1(config-bgp-vrf-neighbor)# address-family ipv4 unicast
PE1(config-bgp-neighbor-af-vrf)# route-map BGP_OUT out
PE1(config-bgp-neighbor-af-vrf)# enable
PE1(config-bgp-neighbor-af-vrf)# exit
PE1(config-bgp-vrf-neighbor)# enable
PE1(config-bgp-vrf-neighbor)# exit
PE1(config-bgp-vrf)# address-family ipv4 unicast
PE1(config-bgp-vrf-af)# redistribute bgp 65501 route-map BGP_OUT
PE1(config-bgp-vrf-af)# exit
PE1(config-bgp-vrf)# enable
PE1(config-bgp-vrf)# exit
PE1(config-bgp)# exit
PE1(config)#
PE1(config)# router ospf 1
PE1(config-ospf)# area 0.0.0.0
PE1(config-ospf-area)# enable
PE1(config-ospf-area)# exit
PE1(config-ospf)# enable
PE1(config-ospf)# exit
PE1(config)#
PE1(config)# interface gigabitethernet 1/0/1.100
PE1(config-subif)# ip vrf forwarding CE1
PE1(config-subif)# description "to CE1"
PE1(config-subif)# ip firewall disable
PE1(config-subif)# ip address 192.168.1.2/30
PE1(config-subif)# exit
PE1(config)# interface gigabitethernet 1/0/1.200
PE1(config-subif)# ip vrf forwarding CE2
PE1(config-subif)# description "to CE2"
PE1(config-subif)# ip firewall disable
PE1(config-subif)# ip address 192.168.2.2/30
PE1(config-subif)# exit
PE1(config)# interface gigabitethernet 1/0/2
PE1(config-if-gi)# description "to ASBR1"
PE1(config-if-gi)# mtu 1522
PE1(config-if-gi)# ip firewall disable
PE1(config-if-gi)# ip address 10.100.0.1/30
PE1(config-if-gi)# ip ospf instance 1
PE1(config-if-gi)# ip ospf
PE1(config-if-gi)# exit
PE1(config)# interface loopback 1
PE1(config-loopback)# ip address 10.10.1.1/32
PE1(config-loopback)# ip ospf instance 1
PE1(config-loopback)# ip ospf
PE1(config-loopback)# exit
PE1(config)# mpls
PE1(config-mpls)# ldp
PE1(config-ldp)# router-id 10.10.1.1
PE1(config-ldp)# address-family ipv4
PE1(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
PE1(config-ldp-af-ipv4-if)# exit
PE1(config-ldp-af-ipv4)# exit
PE1(config-ldp)# enable
PE1(config-ldp)# exit
PE1(config-mpls)# forwarding interface gigabitethernet 1/0/2
PE1(config-mpls)# exit
PE1(config)# do com
PE1(config)# do confPE2
PE2(config)# hostname PE2
PE2(config)#
PE2(config)# ip vrf CE1
PE2(config-vrf)# ip protocols bgp max-routes 100
PE2(config-vrf)# rd 65501:1
PE2(config-vrf)# route-target export 65501:1
PE2(config-vrf)# route-target import 65501:1
PE2(config-vrf)# exit
PE2(config)# ip vrf CE2
PE2(config-vrf)# ip protocols bgp max-routes 100
PE2(config-vrf)# rd 65501:2
PE2(config-vrf)# route-target export 65501:2
PE2(config-vrf)# route-target import 65501:2
PE2(config-vrf)# exit
PE2(config)#
PE2(config)# system jumbo-frames
PE2(config)#
PE2(config)# route-map BGP_OUT
PE2(config-route-map)# rule 1
PE2(config-route-map-rule)# exit
PE2(config-route-map)# exit
PE2(config)# router bgp 65500
PE2(config-bgp)# neighbor 10.11.1.2
PE2(config-bgp-neighbor)# remote-as 65500
PE2(config-bgp-neighbor)# update-source 10.11.1.1
PE2(config-bgp-neighbor)# address-family vpnv4 unicast
PE2(config-bgp-neighbor-af)# send-community extended
PE2(config-bgp-neighbor-af)# enable
PE2(config-bgp-neighbor-af)# exit
PE2(config-bgp-neighbor)# enable
PE2(config-bgp-neighbor)# exit
PE2(config-bgp)# enable
PE2(config-bgp)# vrf CE1
PE2(config-bgp-vrf)# neighbor 192.168.3.1
PE2(config-bgp-vrf-neighbor)# remote-as 65512
PE2(config-bgp-vrf-neighbor)# address-family ipv4 unicast
PE2(config-bgp-neighbor-af-vrf)# route-map BGP_OUT out
PE2(config-bgp-neighbor-af-vrf)# enable
PE2(config-bgp-neighbor-af-vrf)# exit
PE2(config-bgp-vrf-neighbor)# enable
PE2(config-bgp-vrf-neighbor)# exit
PE2(config-bgp-vrf)# address-family ipv4 unicast
PE2(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP_OUT
PE2(config-bgp-vrf-af)# exit
PE2(config-bgp-vrf)# enable
PE2(config-bgp-vrf)# exit
PE2(config-bgp)# vrf CE2
PE2(config-bgp-vrf)# neighbor 192.168.4.1
PE2(config-bgp-vrf-neighbor)# remote-as 65513
PE2(config-bgp-vrf-neighbor)# address-family ipv4 unicast
PE2(config-bgp-neighbor-af-vrf)# route-map BGP_OUT out
PE2(config-bgp-neighbor-af-vrf)# enable
PE2(config-bgp-neighbor-af-vrf)# exit
PE2(config-bgp-vrf-neighbor)# enable
PE2(config-bgp-vrf-neighbor)# exit
PE2(config-bgp-vrf)# address-family ipv4 unicast
PE2(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP_OUT
PE2(config-bgp-vrf-af)# exit
PE2(config-bgp-vrf)# enable
PE2(config-bgp-vrf)# exit
PE2(config-bgp)# exit
PE2(config)#
PE2(config)# router ospf 1
PE2(config-ospf)# router-id 10.11.1.1
PE2(config-ospf)# area 0.0.0.0
PE2(config-ospf-area)# enable
PE2(config-ospf-area)# exit
PE2(config-ospf)# enable
PE2(config-ospf)# exit
PE2(config)#
PE2(config)# interface gigabitethernet 1/0/1.100
PE2(config-subif)# ip vrf forwarding CE1
PE2(config-subif)# description "to CE3"
PE2(config-subif)# ip firewall disable
PE2(config-subif)# ip address 192.168.3.2/30
PE2(config-subif)# exit
PE2(config)# interface gigabitethernet 1/0/1.200
PE2(config-subif)# ip vrf forwarding CE2
PE2(config-subif)# description "CE4"
PE2(config-subif)# ip firewall disable
PE2(config-subif)# ip address 192.168.4.2/30
PE2(config-subif)# exit
PE2(config)# interface gigabitethernet 1/0/2
PE2(config-if-gi)# description "to ASBR2"
PE2(config-if-gi)# mtu 1522
PE2(config-if-gi)# ip firewall disable
PE2(config-if-gi)# ip address 10.102.0.1/30
PE2(config-if-gi)# ip ospf instance 1
PE2(config-if-gi)# ip ospf
PE2(config-if-gi)# exit
PE2(config)# interface loopback 1
PE2(config-loopback)# ip address 10.11.1.1/32
PE2(config-loopback)# ip ospf instance 1
PE2(config-loopback)# ip ospf
PE2(config-loopback)# exit
PE2(config)# mpls
PE2(config-mpls)# ldp
PE2(config-ldp)# router-id 10.11.1.1
PE2(config-ldp)# address-family ipv4
PE2(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
PE2(config-ldp-af-ipv4-if)# exit
PE2(config-ldp-af-ipv4)# exit
PE2(config-ldp)# enable
PE2(config-ldp)# exit
PE2(config-mpls)# forwarding interface gigabitethernet 1/0/2
PE2(config-mpls)# exit
PE2(config)# do com
PE2(config)# do conf
Configure ASBR1 and ASBR2:
ASBR1
ASBR1(config)# hostname ASBR1
ASBR1(config)#
ASBR1(config)# system jumbo-frames
ASBR1(config)#
ASBR1(config)# route-map VPNv4
ASBR1(config-route-map)# rule 1
ASBR1(config-route-map-rule)# exit
ASBR1(config-route-map)# exit
ASBR1(config)# router bgp 65501
ASBR1(config-bgp)# router-id 10.10.1.2
ASBR1(config-bgp)# neighbor 10.10.1.1
ASBR1(config-bgp-neighbor)# remote-as 65501
ASBR1(config-bgp-neighbor)# update-source 10.10.1.2
ASBR1(config-bgp-neighbor)# address-family vpnv4 unicast
ASBR1(config-bgp-neighbor-af)# next-hop-self
ASBR1(config-bgp-neighbor-af)# send-community extended
ASBR1(config-bgp-neighbor-af)# enable
ASBR1(config-bgp-neighbor-af)# exit
ASBR1(config-bgp-neighbor)# enable
ASBR1(config-bgp-neighbor)# exit
ASBR1(config-bgp)# neighbor 10.101.0.1
ASBR1(config-bgp-neighbor)# remote-as 65500
ASBR1(config-bgp-neighbor)# address-family vpnv4 unicast
ASBR1(config-bgp-neighbor-af)# route-map VPNv4 out
ASBR1(config-bgp-neighbor-af)# send-community extended
ASBR1(config-bgp-neighbor-af)# enable
ASBR1(config-bgp-neighbor-af)# exit
ASBR1(config-bgp-neighbor)# enable
ASBR1(config-bgp-neighbor)# exit
ASBR1(config-bgp)# enable
ASBR1(config-bgp)# exit
ASBR1(config)#
ASBR1(config)# router ospf 1
ASBR1(config-ospf)# area 0.0.0.0
ASBR1(config-ospf-area)# enable
ASBR1(config-ospf-area)# exit
ASBR1(config-ospf)# enable
ASBR1(config-ospf)# exit
ASBR1(config)#
ASBR1(config)# interface gigabitethernet 1/0/1
ASBR1(config-if-gi)# description "to ASBR2"
ASBR1(config-if-gi)# ip firewall disable
ASBR1(config-if-gi)# ip address 10.101.0.2/30
ASBR1(config-if-gi)# exit
ASBR1(config)# interface gigabitethernet 1/0/2
ASBR1(config-if-gi)# description "to PE1"
ASBR1(config-if-gi)# mtu 1522
ASBR1(config-if-gi)# ip firewall disable
ASBR1(config-if-gi)# ip address 10.100.0.2/30
ASBR1(config-if-gi)# ip ospf instance 1
ASBR1(config-if-gi)# ip ospf
ASBR1(config-if-gi)# exit
ASBR1(config)# interface loopback 1
ASBR1(config-loopback)# ip address 10.10.1.2/32
ASBR1(config-loopback)# ip ospf instance 1
ASBR1(config-loopback)# ip ospf
ASBR1(config-loopback)# exit
ASBR1(config)# mpls
ASBR1(config-mpls)# ldp
ASBR1(config-ldp)# router-id 10.10.1.2
ASBR1(config-ldp)# address-family ipv4
ASBR1(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ASBR1(config-ldp-af-ipv4-if)# exit
ASBR1(config-ldp-af-ipv4)# exit
ASBR1(config-ldp)# enable
ASBR1(config-ldp)# exit
ASBR1(config-mpls)# forwarding interface gigabitethernet 1/0/1
ASBR1(config-mpls)# forwarding interface gigabitethernet 1/0/2
ASBR1(config-mpls)# exit
ASBR1(config)# do com
ASBR1(config)# do conf
ASBR2
ASBR2(config)# hostname ASBR2
ASBR2(config)#
ASBR2(config)# system jumbo-frames
ASBR2(config)#
ASBR2(config)# route-map VPNv4
ASBR2(config-route-map)# rule 1
ASBR2(config-route-map-rule)# exit
ASBR2(config-route-map)# exit
ASBR2(config)# router bgp 65500
ASBR2(config-bgp)# router-id 10.11.1.2
ASBR2(config-bgp)# neighbor 10.101.0.2
ASBR2(config-bgp-neighbor)# remote-as 65501
ASBR2(config-bgp-neighbor)# address-family vpnv4 unicast
ASBR2(config-bgp-neighbor-af)# route-map VPNv4 out
ASBR2(config-bgp-neighbor-af)# send-community extended
ASBR2(config-bgp-neighbor-af)# enable
ASBR2(config-bgp-neighbor-af)# exit
ASBR2(config-bgp-neighbor)# enable
ASBR2(config-bgp-neighbor)# exit
ASBR2(config-bgp)# neighbor 10.11.1.1
ASBR2(config-bgp-neighbor)# remote-as 65500
ASBR2(config-bgp-neighbor)# update-source 10.11.1.2
ASBR2(config-bgp-neighbor)# address-family vpnv4 unicast
ASBR2(config-bgp-neighbor-af)# next-hop-self
ASBR2(config-bgp-neighbor-af)# send-community extended
ASBR2(config-bgp-neighbor-af)# enable
ASBR2(config-bgp-neighbor-af)# exit
ASBR2(config-bgp-neighbor)# enable
ASBR2(config-bgp-neighbor)# exit
ASBR2(config-bgp)# enable
ASBR2(config-bgp)# exit
ASBR2(config)#
ASBR2(config)# router ospf 1
ASBR2(config-ospf)# router-id 10.11.1.2
ASBR2(config-ospf)# area 0.0.0.0
ASBR2(config-ospf-area)# enable
ASBR2(config-ospf-area)# exit
ASBR2(config-ospf)# enable
ASBR2(config-ospf)# exit
ASBR2(config)#
ASBR2(config)# interface gigabitethernet 1/0/1
ASBR2(config-if-gi)# description "to ASBR1"
ASBR2(config-if-gi)# ip firewall disable
ASBR2(config-if-gi)# ip address 10.101.0.1/30
ASBR2(config-if-gi)# exit
ASBR2(config)# interface gigabitethernet 1/0/2
ASBR2(config-if-gi)# description "to PE2"
ASBR2(config-if-gi)# mtu 1522
ASBR2(config-if-gi)# ip firewall disable
ASBR2(config-if-gi)# ip address 10.102.0.2/30
ASBR2(config-if-gi)# ip ospf instance 1
ASBR2(config-if-gi)# ip ospf
ASBR2(config-if-gi)# exit
ASBR2(config)# interface loopback 1
ASBR2(config-loopback)# ip address 10.11.1.2/32
ASBR2(config-loopback)# ip ospf instance 1
ASBR2(config-loopback)# ip ospf
ASBR2(config-loopback)# exit
ASBR2(config)# mpls
ASBR2(config-mpls)# ldp
ASBR2(config-ldp)# router-id 10.11.1.2
ASBR2(config-ldp)# address-family ipv4
ASBR2(config-ldp-af-ipv4)# interface gigabitethernet 1/0/2
ASBR2(config-ldp-af-ipv4-if)# exit
ASBR2(config-ldp-af-ipv4)# exit
ASBR2(config-ldp)# enable
ASBR2(config-ldp)# exit
ASBR2(config-mpls)# forwarding interface gigabitethernet 1/0/1
ASBR2(config-mpls)# forwarding interface gigabitethernet 1/0/2
ASBR2(config-mpls)# exit
ASBR2(config)# do com
ASBR2(config)# do conf
After completing the configuration, check the distribution of routing information and the network availability of the nodes:
PE1# sh bgp vpnv4 unicast all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher IP Prefix Next hop Metric Label LocPrf Weight Path
----- --------------------- ------------------ --------------- ---------- ------- ---------- ------ ----------------
*>i 65501:2 10.104.0.1/32 10.10.1.2 -- 23 100 0 65500 65513 i
*>i 65501:1 10.103.0.1/32 10.10.1.2 -- 19 100 0 65500 65512 i
*> 65501:2 10.101.0.1/32 -- -- 29 100 -- 65511 i
*> 65501:1 10.100.0.1/32 -- -- 28 100 -- 65510 i
ASBR1# sh bgp vpnv4 unicast all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher IP Prefix Next hop Metric Label LocPrf Weight Path
----- --------------------- ------------------ --------------- ---------- ------- ---------- ------ ----------------
*> 65501:2 10.104.0.1/32 10.101.0.1 -- 24 100 0 65500 65513 i
*> 65501:1 10.103.0.1/32 10.101.0.1 -- 20 100 0 65500 65512 i
*>i 65501:2 10.101.0.1/32 10.10.1.1 -- 29 100 0 65511 i
*>i 65501:1 10.100.0.1/32 10.10.1.1 -- 28 100 0 65510 i
ASBR2# sh bgp vpnv4 unicast all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher IP Prefix Next hop Metric Label LocPrf Weight Path
----- --------------------- ------------------ --------------- ---------- ------- ---------- ------ ----------------
*>i 65501:2 10.104.0.1/32 10.11.1.1 -- 19 100 0 65513 i
*>i 65501:1 10.103.0.1/32 10.11.1.1 -- 18 100 0 65512 i
*> 65501:2 10.101.0.1/32 10.101.0.2 -- 30 100 0 65501 65511 i
*> 65501:1 10.100.0.1/32 10.101.0.2 -- 31 100 0 65501 65510 i
PE2# sh bgp vpnv4 unicast all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher IP Prefix Next hop Metric Label LocPrf Weight Path
----- --------------------- ------------------ --------------- ---------- ------- ---------- ------ ----------------
*> 65501:2 10.104.0.1/32 -- -- 19 100 -- 65513 i
*> 65501:1 10.103.0.1/32 -- -- 18 100 -- 65512 i
*>i 65501:2 10.101.0.1/32 10.11.1.2 -- 29 100 0 65501 65511 i
*>i 65501:1 10.100.0.1/32 10.11.1.2 -- 30 100 0 65501 65510 i
CE4# ping 10.104.0.1 source ip 10.101.0.1 detailed
PING 10.104.0.1 (10.104.0.1) from 10.101.0.1 : 56 bytes of data.
64 bytes from 10.104.0.1: icmp_seq=1 ttl=0 time=2.25 ms
64 bytes from 10.104.0.1: icmp_seq=2 ttl=0 time=2.08 ms
64 bytes from 10.104.0.1: icmp_seq=3 ttl=0 time=2.15 ms
64 bytes from 10.104.0.1: icmp_seq=4 ttl=0 time=2.12 ms
64 bytes from 10.104.0.1: icmp_seq=5 ttl=0 time=2.09 ms
CE1# ping 10.103.0.1 source ip 10.100.0.1 detailed
PING 10.103.0.1 (10.103.0.1) from 10.100.0.1 : 56 bytes of data.
64 bytes from 10.103.0.1: icmp_seq=1 ttl=0 time=2.22 ms
64 bytes from 10.103.0.1: icmp_seq=2 ttl=0 time=2.11 ms
64 bytes from 10.103.0.1: icmp_seq=3 ttl=0 time=2.09 ms
64 bytes from 10.103.0.1: icmp_seq=4 ttl=0 time=2.09 ms
64 bytes from 10.103.0.1: icmp_seq=5 ttl=0 time=2.11 ms
MPLS over GRE
This section provides example of configuration of VPN services built through a GRE tunnel.
L2VPN
Example of configuration of EoMPLS over GRE as a l2vpn service is given below. It is also possible to build VPLS over GRE (BGP or LDP signaling).
When configuring MTU on a tunnel, consider the following:
- At least one mpls label will be present when passing through the tunnel. Accounting should include all labels in the stack, for example, explicit null or entropy label;
- vlan and q-in-q headers must be taken into account (if they present);
- If MTU of the outgoing interface is exceeded, the packet will be dropped (if GRE traffic match fragment is disabled);
- Control world is not supported;
- DF bit will be set to 1.
Approximate packet structure is given in figure below:
Configure CE1 and CE2:
CE1
hostname CE1
interface gigabitethernet 1/0/2
ip firewall disable
ip address 10.100.0.1/24
exit
CE2
hostname CE2
interface gigabitethernet 1/0/2
ip firewall disable
ip address 10.100.0.2/24
exit
Configure ESR1 and ESR2:
ESR1
ESR1(config)# hostname ESR1
ESR1(config)#
ESR1(config)# system cpu load-balance mpls passenger ip
ESR1(config)# system cpu load-balance mpls passenger ipoe-pw-without-cw
ESR1(config)# security zone trusted
ESR1(config-zone)# exit
ESR1(config)# security zone untrusted
ESR1(config-zone)# exit
ESR1(config)#
ESR1(config)# router ospf 1
ESR1(config-ospf)# area 0.0.0.0
ESR1(config-ospf-area)# enable
ESR1(config-ospf-area)# exit
ESR1(config-ospf)# enable
ESR1(config-ospf)# exit
ESR1(config)#
ESR1(config)# interface gigabitethernet 1/0/1
ESR1(config-if-gi)# security-zone untrusted
ESR1(config-if-gi)# ip address 192.0.2.1/30
ESR1(config-if-gi)# exit
ESR1(config)# interface gigabitethernet 1/0/2
ESR1(config-if-gi)# description "From CE1"
ESR1(config-if-gi)# mode switchport
ESR1(config-if-gi)# exit
ESR1(config)# interface loopback 1
ESR1(config-loopback)# ip address 10.100.0.1/32
ESR1(config-loopback)# ip ospf instance 1
ESR1(config-loopback)# ip ospf
ESR1(config-loopback)# exit
ESR1(config)# tunnel gre 1
ESR1(config-gre)# key 60
ESR1(config-gre)# ttl 64
ESR1(config-gre)# mtu 1458
ESR1(config-gre)# ip firewall disable
ESR1(config-gre)# local address 192.0.2.1
ESR1(config-gre)# remote address 192.0.2.2
ESR1(config-gre)# ip address 10.0.0.1/30
ESR1(config-gre)# ip ospf instance 1
ESR1(config-gre)# ip ospf network point-to-point
ESR1(config-gre)# ip ospf
ESR1(config-gre)# enable
ESR1(config-gre)# exit
ESR1(config)#
ESR1(config)# mpls
ESR1(config-mpls)# ldp
ESR1(config-ldp)# router-id 10.100.0.1
ESR1(config-ldp)# address-family ipv4
ESR1(config-ldp-af-ipv4)# interface gre 1
ESR1(config-ldp-af-ipv4-if)# exit
ESR1(config-ldp-af-ipv4)# exit
ESR1(config-ldp)# enable
ESR1(config-ldp)# exit
ESR1(config-mpls)# l2vpn
ESR1(config-l2vpn)# pw-class VPWS
ESR1(config-l2vpn-pw-class)# exit
ESR1(config-l2vpn)# p2p EoMPLS
ESR1(config-l2vpn-p2p)# interface gigabitethernet 1/0/2
ESR1(config-l2vpn-p2p)# pw 100 10.100.0.2
ESR1(config-l2vpn-pw)# pw-class VPWS
ESR1(config-l2vpn-pw)# enable
ESR1(config-l2vpn-pw)# exit
ESR1(config-l2vpn-p2p)# enable
ESR1(config-l2vpn-p2p)# exit
ESR1(config-l2vpn)# exit
ESR1(config-mpls)# forwarding interface gre 1
ESR1(config-mpls)# exit
ESR1(config)# security zone-pair untrusted self
ESR1(config-zone-pair)# rule 1
ESR1(config-zone-pair-rule)# action permit
ESR1(config-zone-pair-rule)# match protocol gre
ESR1(config-zone-pair-rule)# enable
ESR1(config-zone-pair-rule)# exit
ESR1(config-zone-pair)# exit
ESR1(config)# do com
ESR1(config)# do confESR2
ESR2(config)# hostname ESR2
ESR2(config)#
ESR2(config)# system cpu load-balance mpls passenger ip
ESR2(config)# system cpu load-balance mpls passenger ipoe-pw-without-cw
ESR2(config)# security zone trusted
ESR2(config-zone)# exit
ESR2(config)# security zone untrusted
ESR2(config-zone)# exit
ESR2(config)#
ESR2(config)# router ospf 1
ESR2(config-ospf)# area 0.0.0.0
ESR2(config-ospf-area)# enable
ESR2(config-ospf-area)# exit
ESR2(config-ospf)# enable
ESR2(config-ospf)# exit
ESR2(config)#
ESR2(config)# interface gigabitethernet 1/0/1
ESR2(config-if-gi)# security-zone untrusted
ESR2(config-if-gi)# ip address 192.0.2.2/30
ESR2(config-if-gi)# exit
ESR2(config)# interface gigabitethernet 1/0/2
ESR2(config-if-gi)# description "From CE2"
ESR2(config-if-gi)# mode switchport
ESR2(config-if-gi)# exit
ESR2(config)# interface loopback 1
ESR2(config-loopback)# ip address 10.100.0.2/32
ESR2(config-loopback)# ip ospf instance 1
ESR2(config-loopback)# ip ospf
ESR2(config-loopback)# exit
ESR2(config)# tunnel gre 1
ESR2(config-gre)# key 60
ESR2(config-gre)# ttl 64
ESR2(config-gre)# mtu 1458
ESR2(config-gre)# ip firewall disable
ESR2(config-gre)# local address 192.0.2.2
ESR2(config-gre)# remote address 192.0.2.1
ESR2(config-gre)# ip address 10.0.0.2/30
ESR2(config-gre)# ip ospf instance 1
ESR2(config-gre)# ip ospf network point-to-point
ESR2(config-gre)# ip ospf
ESR2(config-gre)# enable
ESR2(config-gre)# exit
ESR2(config)#
ESR2(config)# mpls
ESR2(config-mpls)# ldp
ESR2(config-ldp)# router-id 10.100.0.2
ESR2(config-ldp)# address-family ipv4
ESR2(config-ldp-af-ipv4)# interface gre 1
ESR2(config-ldp-af-ipv4-if)# exit
ESR2(config-ldp-af-ipv4)# exit
ESR2(config-ldp)# enable
ESR2(config-ldp)# exit
ESR2(config-mpls)# l2vpn
ESR2(config-l2vpn)# pw-class VPWS
ESR2(config-l2vpn-pw-class)# exit
ESR2(config-l2vpn)# p2p EoMPLS
ESR2(config-l2vpn-p2p)# interface gigabitethernet 1/0/2
ESR2(config-l2vpn-p2p)# pw 100 10.100.0.1
ESR2(config-l2vpn-pw)# pw-class VPWS
ESR2(config-l2vpn-pw)# enable
ESR2(config-l2vpn-pw)# exit
ESR2(config-l2vpn-p2p)# enable
ESR2(config-l2vpn-p2p)# exit
ESR2(config-l2vpn)# exit
ESR2(config-mpls)# forwarding interface gre 1
ESR2(config-mpls)# exit
ESR2(config)# security zone-pair untrusted self
ESR2(config-zone-pair)# rule 1
ESR2(config-zone-pair-rule)# action deny
ESR2(config-zone-pair-rule)# match protocol gre
ESR2(config-zone-pair-rule)# enable
ESR2(config-zone-pair-rule)# exit
ESR2(config-zone-pair)# exit
ESR2(config)# do com
ESR2(config)# do confConfiguration is complete. Check the service state and nodes availability:
*Tunnel configuration*
ESR2# sh tunnels configuration gre 1
State: Enabled
Description: --
Mode: ip
Bridge group: --
VRF: --
Local address: 192.0.2.2
Remote address: 192.0.2.1
Calculates checksums for outgoing GRE packets: No
Requires that all input GRE packets were checksum: No
key: 60
TTL: 64
DSCP: Inherit
MTU: 1458
Path MTU discovery: Enabled
Don't fragment bit suppression: Disabled
Security zone: --
Multipoint mode: Disabled
Keepalive:
State: Disabled
Timeout: 10
Retries: 6
Destination address: --
*Service status and selected tags*
sh mpls l2vpn p2p
P2P: EoMPLS
gigabitethernet 1/0/2:
MTU: 1500
Status: Up
PW ID 100, Neighbor 10.100.0.1:
MTU: 1500
Status TLV: Enable
Last change: 00:14:27
Status: Up
ESR2# sh mpls forwarding-table
Local Outgoing Prefix Outgoing Next Hop
label label or tunnel ID Interface
-------- -------- ------------------------------------------- ----------- -----------
17 imp-null 10.100.0.1/32 gre 1 10.0.0.1
16 16 PW ID 100 -- 10.100.0.1
*Availability*CE1# ping 10.100.0.2 detailed
PING 10.100.0.2 (10.100.0.2) 56 bytes of data.
64 bytes from 10.100.0.2: icmp_seq=1 ttl=0 time=1.38 ms
64 bytes from 10.100.0.2: icmp_seq=2 ttl=0 time=1.22 ms
64 bytes from 10.100.0.2: icmp_seq=3 ttl=0 time=1.33 ms
64 bytes from 10.100.0.2: icmp_seq=4 ttl=0 time=1.26 ms
64 bytes from 10.100.0.2: icmp_seq=5 ttl=0 time=1.17 ms
L3VPN
When configuring MTU on a tunnel, consider the following:
- At least one mpls label will be present when passing through the tunnel. Accounting should include all labels in the stack, for example, explicit null or entropy label;
- If MTU of the outgoing interface is exceeded, the packet will be dropped (if GRE traffic match fragment is disabled);
- Control world is not supported;
- DF bit will be set to 1.
Approximate packet structure is given in figure below:
Configure CE1 and CE2:
CE1
CE1(config)# hostname CE1
CE1(config)#
CE1(config)# route-map BGP_OUT
CE1(config-route-map)# rule 1
CE1(config-route-map-rule)# exit
CE1(config-route-map)# exit
CE1(config)# router bgp 65501
CE1(config-bgp)# neighbor 10.10.0.2
CE1(config-bgp-neighbor)# remote-as 65500
CE1(config-bgp-neighbor)# address-family ipv4 unicast
CE1(config-bgp-neighbor-af)# route-map BGP_OUT out
CE1(config-bgp-neighbor-af)# enable
CE1(config-bgp-neighbor-af)# exit
CE1(config-bgp-neighbor)# enable
CE1(config-bgp-neighbor)# exit
CE1(config-bgp)# address-family ipv4 unicast
CE1(config-bgp-af)# network 10.100.0.0/24
CE1(config-bgp-af)# exit
CE1(config-bgp)# enable
CE1(config-bgp)# exit
CE1(config)#
CE1(config)#
CE1(config)# interface gigabitethernet 1/0/2
CE1(config-if-gi)# description "to ESR1"
CE1(config-if-gi)# ip firewall disable
CE1(config-if-gi)# ip address 10.10.0.1/30
CE1(config-if-gi)# exit
CE1(config)# interface loopback 1
CE1(config-loopback)# ip address 10.100.0.1/24
CE1(config-loopback)# exitCE2
CE2(config)# hostname CE2
CE2(config)#
CE2(config)# route-map BGP_OUT
CE2(config-route-map)# rule 1
CE2(config-route-map-rule)# exit
CE2(config-route-map)# exit
CE2(config)# router bgp 65502
CE2(config-bgp)# neighbor 10.10.0.5
CE2(config-bgp-neighbor)# remote-as 65500
CE2(config-bgp-neighbor)# address-family ipv4 unicast
CE2(config-bgp-neighbor-af)# route-map BGP_OUT out
CE2(config-bgp-neighbor-af)# enable
CE2(config-bgp-neighbor-af)# exit
CE2(config-bgp-neighbor)# enable
CE2(config-bgp-neighbor)# exit
CE2(config-bgp)# address-family ipv4 unicast
CE2(config-bgp-af)# network 10.101.0.0/24
CE2(config-bgp-af)# exit
CE2(config-bgp)# enable
CE2(config-bgp)# exit
CE2(config)#
CE2(config)#
CE2(config)# interface gigabitethernet 1/0/2
CE2(config-if-gi)# description "to ESR2"
CE2(config-if-gi)# ip firewall disable
CE2(config-if-gi)# ip address 10.10.0.6/30
CE2(config-if-gi)# exit
CE2(config)# interface loopback 1
CE2(config-loopback)# ip address 10.101.0.1/24
CE2(config-loopback)# exit
Configure ESR1 and ESR2:
ESR1
ESR1(config)# hostname ESR1
ESR1(config)#
ESR1(config)# ip vrf l3vpn_service
ESR1(config-vrf)# ip protocols bgp max-routes 100
ESR1(config-vrf)# rd 65500:1
ESR1(config-vrf)# route-target export 65500:1
ESR1(config-vrf)# route-target import 65500:1
ESR1(config-vrf)# exit
ESR1(config)#
ESR1(config)#
ESR1(config)# system cpu load-balance mpls passenger ip
ESR1(config)# security zone untrusted
ESR1(config-zone)# exit
ESR1(config)# security zone trusted
ESR1(config-zone)# exit
ESR1(config)#
ESR1(config)# route-map BGP_OUT
ESR1(config-route-map)# rule 1
ESR1(config-route-map-rule)# exit
ESR1(config-route-map)# exit
ESR1(config)# router bgp 65500
ESR1(config-bgp)# router-id 10.12.0.1
ESR1(config-bgp)# neighbor 10.12.0.2
ESR1(config-bgp-neighbor)# remote-as 65500
ESR1(config-bgp-neighbor)# update-source 10.12.0.1
ESR1(config-bgp-neighbor)# address-family vpnv4 unicast
ESR1(config-bgp-neighbor-af)# send-community extended
ESR1(config-bgp-neighbor-af)# enable
ESR1(config-bgp-neighbor-af)# exit
ESR1(config-bgp-neighbor)# enable
ESR1(config-bgp-neighbor)# exit
ESR1(config-bgp)# enable
ESR1(config-bgp)# vrf l3vpn_service
ESR1(config-bgp-vrf)# neighbor 10.10.0.1
ESR1(config-bgp-vrf-neighbor)# remote-as 65501
ESR1(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR1(config-bgp-neighbor-af-vrf)# route-map BGP_OUT out
ESR1(config-bgp-neighbor-af-vrf)# enable
ESR1(config-bgp-neighbor-af-vrf)# exit
ESR1(config-bgp-vrf-neighbor)# enable
ESR1(config-bgp-vrf-neighbor)# exit
ESR1(config-bgp-vrf)# address-family ipv4 unicast
ESR1(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP_OUT
ESR1(config-bgp-vrf-af)# exit
ESR1(config-bgp-vrf)# enable
ESR1(config-bgp-vrf)# exit
ESR1(config-bgp)# exit
ESR1(config)#
ESR1(config)# router ospf 1
ESR1(config-ospf)# router-id 10.12.0.1
ESR1(config-ospf)# area 0.0.0.0
ESR1(config-ospf-area)# enable
ESR1(config-ospf-area)# exit
ESR1(config-ospf)# enable
ESR1(config-ospf)# exit
ESR1(config)#
ESR1(config)# interface gigabitethernet 1/0/1
ESR1(config-if-gi)# security-zone untrusted
ESR1(config-if-gi)# ip address 192.0.2.1/30
ESR1(config-if-gi)# exit
ESR1(config)# interface gigabitethernet 1/0/2
ESR1(config-if-gi)# ip vrf forwarding l3vpn_service
ESR1(config-if-gi)# description "from CE1"
ESR1(config-if-gi)# ip firewall disable
ESR1(config-if-gi)# ip address 10.10.0.2/30
ESR1(config-if-gi)# exit
ESR1(config)# interface loopback 1
ESR1(config-loopback)# ip address 10.12.0.1/32
ESR1(config-loopback)# ip ospf instance 1
ESR1(config-loopback)# ip ospf
ESR1(config-loopback)# exit
ESR1(config)# tunnel gre 1
ESR1(config-gre)# key 60
ESR1(config-gre)# ttl 64
ESR1(config-gre)# mtu 1472
ESR1(config-gre)# ip firewall disable
ESR1(config-gre)# local address 192.0.2.1
ESR1(config-gre)# remote address 192.0.2.2
ESR1(config-gre)# ip address 10.11.0.1/30
ESR1(config-gre)# ip ospf instance 1
ESR1(config-gre)# ip ospf
ESR1(config-gre)# enable
ESR1(config-gre)# exit
ESR1(config)#
ESR1(config)# mpls
ESR1(config-mpls)# ldp
ESR1(config-ldp)# router-id 10.12.0.1
ESR1(config-ldp)# address-family ipv4
ESR1(config-ldp-af-ipv4)# interface gre 1
ESR1(config-ldp-af-ipv4-if)# exit
ESR1(config-ldp-af-ipv4)# exit
ESR1(config-ldp)# enable
ESR1(config-ldp)# exit
ESR1(config-mpls)# forwarding interface gre 1
ESR1(config-mpls)# exit
ESR1(config)# security zone-pair untrusted self
ESR1(config-zone-pair)# rule 1
ESR1(config-zone-pair-rule)# action permit
ESR1(config-zone-pair-rule)# match protocol gre
ESR1(config-zone-pair-rule)# enable
ESR1(config-zone-pair-rule)# exit
ESR1(config-zone-pair)# exitESR2(config)# hostname ESR2
ESR2(config)#
ESR2(config)# ip vrf l3vpn_service
ESR2(config-vrf)# ip protocols bgp max-routes 100
ESR2(config-vrf)# rd 65500:1
ESR2(config-vrf)# route-target export 65500:1
ESR2(config-vrf)# route-target import 65500:1
ESR2(config-vrf)# exit
ESR2(config)#
ESR2(config)#
ESR2(config)# system cpu load-balance mpls passenger ip
ESR2(config)# security zone untrusted
ESR2(config-zone)# exit
ESR2(config)# security zone trusted
ESR2(config-zone)# exit
ESR2(config)#
ESR2(config)# route-map BGP_OUT
ESR2(config-route-map)# rule 1
ESR2(config-route-map-rule)# exit
ESR2(config-route-map)# exit
ESR2(config)# router bgp 65500
ESR2(config-bgp)# router-id 10.12.0.2
ESR2(config-bgp)# neighbor 10.12.0.1
ESR2(config-bgp-neighbor)# remote-as 65500
ESR2(config-bgp-neighbor)# update-source 10.12.0.2
ESR2(config-bgp-neighbor)# address-family vpnv4 unicast
ESR2(config-bgp-neighbor-af)# send-community extended
ESR2(config-bgp-neighbor-af)# enable
ESR2(config-bgp-neighbor-af)# exit
ESR2(config-bgp-neighbor)# enable
ESR2(config-bgp-neighbor)# exit
ESR2(config-bgp)# enable
ESR2(config-bgp)# vrf l3vpn_service
ESR2(config-bgp-vrf)# neighbor 10.10.0.6
ESR2(config-bgp-vrf-neighbor)# remote-as 65502
ESR2(config-bgp-vrf-neighbor)# address-family ipv4 unicast
ESR2(config-bgp-neighbor-af-vrf)# route-map BGP_OUT out
ESR2(config-bgp-neighbor-af-vrf)# enable
ESR2(config-bgp-neighbor-af-vrf)# exit
ESR2(config-bgp-vrf-neighbor)# enable
ESR2(config-bgp-vrf-neighbor)# exit
ESR2(config-bgp-vrf)# address-family ipv4 unicast
ESR2(config-bgp-vrf-af)# redistribute bgp 65500 route-map BGP_OUT
ESR2(config-bgp-vrf-af)# exit
ESR2(config-bgp-vrf)# enable
ESR2(config-bgp-vrf)# exit
ESR2(config-bgp)# exit
ESR2(config)#
ESR2(config)# router ospf 1
ESR2(config-ospf)# router-id 10.12.0.2
ESR2(config-ospf)# area 0.0.0.0
ESR2(config-ospf-area)# enable
ESR2(config-ospf-area)# exit
ESR2(config-ospf)# enable
ESR2(config-ospf)# exit
ESR2(config)#
ESR2(config)# interface gigabitethernet 1/0/1
ESR2(config-if-gi)# security-zone untrusted
ESR2(config-if-gi)# ip address 192.0.2.2/30
ESR2(config-if-gi)# exit
ESR2(config)# interface gigabitethernet 1/0/2
ESR2(config-if-gi)# ip vrf forwarding l3vpn_service
ESR2(config-if-gi)# description "from CE2"
ESR2(config-if-gi)# ip firewall disable
ESR2(config-if-gi)# ip address 10.10.0.5/30
ESR2(config-if-gi)# exit
ESR2(config)# interface loopback 1
ESR2(config-loopback)# ip address 10.12.0.2/32
ESR2(config-loopback)# ip ospf instance 1
ESR2(config-loopback)# ip ospf
ESR2(config-loopback)# exit
ESR2(config)# tunnel gre 1
ESR2(config-gre)# key 60
ESR2(config-gre)# ttl 64
ESR2(config-gre)# mtu 1472
ESR2(config-gre)# ip firewall disable
ESR2(config-gre)# local address 192.0.2.2
ESR2(config-gre)# remote address 192.0.2.1
ESR2(config-gre)# ip address 10.11.0.2/30
ESR2(config-gre)# ip ospf instance 1
ESR2(config-gre)# ip ospf
ESR2(config-gre)# enable
ESR2(config-gre)# exit
ESR2(config)#
ESR2(config)# mpls
ESR2(config-mpls)# ldp
ESR2(config-ldp)# router-id 10.12.0.2
ESR2(config-ldp)# address-family ipv4
ESR2(config-ldp-af-ipv4)# interface gre 1
ESR2(config-ldp-af-ipv4-if)# exit
ESR2(config-ldp-af-ipv4)# exit
ESR2(config-ldp)# enable
ESR2(config-ldp)# exit
ESR2(config-mpls)# forwarding interface gre 1
ESR2(config-mpls)# exit
ESR2(config)# security zone-pair untrusted self
ESR2(config-zone-pair)# rule 1
ESR2(config-zone-pair-rule)# action permit
ESR2(config-zone-pair-rule)# match protocol gre
ESR2(config-zone-pair-rule)# enable
ESR2(config-zone-pair-rule)# exit
ESR2(config-zone-pair)# exit
After completing the configuration, check the distribution of routing information and the network availability of the nodes:
*GRE tunnel configuration*
ESR2# sh tunnels configuration
Tunnel State Description
---------------- -------- ------------------------------
gre 1 Enabled --
ESR2# sh tunnels configuration gre 1
State: Enabled
Description: --
Mode: ip
Bridge group: --
VRF: --
Local address: 192.0.2.2
Remote address: 192.0.2.1
Calculates checksums for outgoing GRE packets: No
Requires that all input GRE packets were checksum: No
key: 60
TTL: 64
DSCP: Inherit
MTU: 1472
Path MTU discovery: Enabled
Don't fragment bit suppression: Disabled
Security zone: --
Multipoint mode: Disabled
Keepalive:
State: Disabled
Timeout: 10
Retries: 6
Destination address: --
*vpnv4 routes presence*
SR2# sh bgp vpnv4 unicast all
Status codes: * - valid, > - best, i - internal, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Codes Route Distinguisher IP Prefix Next hop Metric Label LocPrf Weight Path
----- --------------------- ------------------ --------------- ---------- ------- ---------- ------ ----------------
*> 65500:1 10.101.0.0/24 -- -- 34 100 -- 65502 i
*>i 65500:1 10.100.0.0/24 10.12.0.1 -- 16 100 0 65501 i
*LDP state*
ESR2# sh mpls ldp neighbor
Peer LDP ID: 10.12.0.1; Local LDP ID 10.12.0.2
State: Operational
TCP connection: 10.12.0.1:646 - 10.12.0.2:46444
Messages sent/received: 60/60
Uptime: 00:53:59
LDP discovery sources:
gre 1
ESR2# sh mpls forwarding-table
Local Outgoing Prefix Outgoing Next Hop
label label or tunnel ID Interface
-------- -------- ------------------------------------------- ---------------- ---------------------------------------
35 imp-null 10.12.0.1/32 gre 1 10.11.0.1
*Availability of nodes in the network*
CE2# ping 10.100.0.1 source ip 10.101.0.1 detailed
PING 10.100.0.1 (10.100.0.1) from 10.101.0.1 : 56 bytes of data.
64 bytes from 10.100.0.1: icmp_seq=1 ttl=0 time=1.32 ms
64 bytes from 10.100.0.1: icmp_seq=2 ttl=0 time=1.12 ms
64 bytes from 10.100.0.1: icmp_seq=3 ttl=0 time=1.14 ms
64 bytes from 10.100.0.1: icmp_seq=4 ttl=0 time=1.09 ms
64 bytes from 10.100.0.1: icmp_seq=5 ttl=0 time=1.15 ms