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Задача: Настроить GRE over IPSec туннель между ESR и Huawei. Также необходимо настроить протокол динамической маршрутизации BGP между туннельными адресами для анонсирования локальных подсетей.

1. Конфигурации устройств
Пример конфигурации ESR:

ESR# show running-config 
hostname ESR

router bgp log-neighbor-changes
router bgp 65000
  router-id 198.51.100.1
  neighbor 198.51.100.2
    remote-as 65000
    address-family ipv4 unicast
      enable
    exit
    enable
  exit
  address-family ipv4 unicast
    network 192.0.2.0/26
  exit
  enable
exit


interface gigabitethernet 1/0/1
  ip firewall disable
  ip address 203.0.113.2/30
exit
interface gigabitethernet 1/0/2
  ip firewall disable
  ip address 192.0.2.1/26
exit
tunnel gre 1
  ttl 255
  mtu 1400
  ip firewall disable
  local address 203.0.113.2
  remote address 203.0.113.6
  ip address 198.51.100.1/30
  enable
exit

security ike proposal ike_proposal
  authentication algorithm sha1
  encryption algorithm aes128
  dh-group 2
exit

security ike policy ike_policy
  pre-shared-key ascii-text Password_123
  proposal ike_proposal
exit

security ike gateway ike_gateway
  ike-policy ike_policy
  local address 203.0.113.2
  local network 203.0.113.2/32 protocol gre 
  remote address 203.0.113.6
  remote network 203.0.113.6/32 protocol gre 
  mode policy-based
exit

security ipsec proposal ipsec_proposal
  authentication algorithm sha1
  encryption algorithm aes128
  protocol esp
exit

security ipsec policy ipsec_policy
  proposal ipsec_proposal
exit

security ipsec vpn ipsec_vpn
  mode ike
  type transport
  ike establish-tunnel route
  ike gateway ike_gateway
  ike ipsec-policy ipsec_policy
  enable
exit

ip route 203.0.113.4/30 203.0.113.1

Пример конфигурации Huawei:

[Huawei]display current-configuration 
...
#
ipsec proposal 1
 encapsulation-mode transport
 esp authentication-algorithm sha1        
 esp encryption-algorithm aes-128 
#
...
ike proposal 1
 encryption-algorithm aes-128 
 dh group2 
 authentication-algorithm sha1 
 sa duration 10800
 authentication-method pre-share
 integrity-algorithm hmac-sha1-96 
 prf hmac-sha1 
#
ike peer ike_peer
 pre-shared-key simple Password_123
 ike-proposal 1
 local-address 203.0.113.6
 remote-address authentication-address 203.0.113.2
 ikev1 phase1-phase2 sa dependent
#
ipsec profile ipsec_profile
 ike-peer ike_peer
 proposal 1
 sa duration traffic-based 0
 sa duration time-based 3600
#

...

#
interface GigabitEthernet0/0/0
 ip address 203.0.113.6 255.255.255.252
#
interface GigabitEthernet0/0/1
 ip address 192.0.2.129 255.255.255.192
#
interface Tunnel0/0/0
 mtu 1400
 tcp adjust-mss 1360
 ip address 198.51.100.2 255.255.255.252
 tunnel-protocol gre
 source 203.0.113.6
 destination 203.0.113.2
 ipsec profile ipsec_profile
#
bgp 65000
 router-id 198.51.100.2
 peer 198.51.100.1 as-number 65000
 #
 ipv4-family unicast
  undo synchronization
  network 192.0.2.128 255.255.255.192
  peer 198.51.100.1 enable     
#
...
#
ip route-static 203.0.113.2 255.255.255.255 203.0.113.5
...


2. Оперативный вывод команд статуса IPsec-туннеля, BGP-сессии, полученной от BGP-соседа маршрутной информации, а также проверка IP-связанности с удаленными локальными подсетями. 

Оперативный вывод команд с ESR:

ESR# show security ipsec vpn status ipsec_vpn 
Currently active IKE SA:
    Name:                      ipsec_vpn
    State:                     Established
    Version:                   v1-only
    Unique ID:                 2
    Local host:                203.0.113.2
    Remote host:               203.0.113.6
    Role:                      Initiator
    Initiator spi:             0xa7c8949a175d688c
    Responder spi:             0x083da58456a8aeee
    Encryption algorithm:      aes128
    Authentication algorithm:  sha1
    Diffie-Hellman group:      2
    Established:               1 minute and 22 seconds ago
    Rekey time:                1 minute and 22 seconds
    Reauthentication time:     2 hours, 49 minutes and 8 seconds
    Child IPsec SAs:
        Name:                      ipsec_vpn-2
        State:                     Installed
        Protocol:                  esp
        Mode:                      Transport
        Encryption algorithm:      aes128
        Authentication algorithm:  sha1
        Rekey time:                47 minutes and 11 seconds
        Life time:                 58 minutes and 38 seconds
        Established:               1 minute and 22 seconds ago
        Traffic statistics: 
            Input bytes:           994
            Output bytes:          1127
            Input packets:         13
            Output packets:        16
        -------------------------------------------------------------

ESR# show bgp neighbors 
BGP neighbor is 198.51.100.2
    BGP state:                       Established
    Type:                            Static neighbor
    Neighbor address:                198.51.100.2
    Neighbor AS:                     65000
    Neighbor ID:                     198.51.100.2
    Neighbor caps:                   refresh AS4
    Session:                         internal multihop AS4
    Source address:                  198.51.100.1
    Weight:                          0
    Hold timer:                      109/180
    Keepalive timer:                 15/60
    Address family ipv4 unicast:    
      Send-label:                    No
      Default originate:             No
      Default information originate: No
    Uptime:                          87 s

ESR# show ip route bgp 
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 192.0.2.128/26       198.51.100.2         0       100         0      i

ESR# ping 192.0.2.129
PING 192.0.2.129 (192.0.2.129) 56 bytes of data.
!!!!!
--- 192.0.2.129 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4005ms
rtt min/avg/max/mdev = 0.829/1.387/2.785/0.723 ms


Оперативный вывод команд с Huawei:

[Huawei]display ipsec sa                      

ipsec sa information:

===============================
Interface: Tunnel0/0/0
===============================

  -----------------------------
  IPSec profile name: "ipsec_profile"
  Mode              : PROF-ISAKMP
  -----------------------------
    Connection ID     : 65
    Encapsulation mode: Transport
    Holding time      : 0d 0h 2m 35s
    Tunnel local      : 203.0.113.6/500
    Tunnel remote     : 203.0.113.2/500
    Flow source       : 203.0.113.6/255.255.255.255 47/0-65535
    Flow destination  : 203.0.113.2/255.255.255.255 47/0-65535

    [Outbound ESP SAs] 
      SPI: 3315963714 (0xc5a59742)
      Proposal: ESP-ENCRYPT-AES-128 ESP-AUTH-SHA1
      SA remaining soft duration (kilobytes/sec): 0/685
      SA remaining hard duration (kilobytes/sec): 0/1045
      Outpacket count       : 20          
      Outpacket encap count : 20
      Outpacket drop count  : 0
      Max sent sequence-number: 20
      UDP encapsulation used for NAT traversal: N

    [Inbound ESP SAs] 
      SPI: 5425586 (0x52c9b2)
      Proposal: ESP-ENCRYPT-AES-128 ESP-AUTH-SHA1
      SA remaining soft duration (kilobytes/sec): 0/685
      SA remaining hard duration (kilobytes/sec): 0/1045
      Inpacket count        : 22
      Inpacket decap count  : 22
      Inpacket drop count   : 0
      Max received sequence-number: 23
      UDP encapsulation used for NAT traversal: N
      Anti-replay : Enable
      Anti-replay window size: 1024

[Huawei]display bgp peer 

 Status codes: * - Dynamic

 BGP local router ID : 198.51.100.2
 Local AS number : 65000
 Total number of peers : 1          Peers in established state : 1
 Total number of dynamic peers : 0

  Peer            V          AS  MsgRcvd  MsgSent  OutQ  Up/Down       State PrefRcv

  198.51.100.1    4       65000        7        7     0 00:03:10 Established       1

[Huawei]display bgp routing-table 

 BGP Local router ID is 198.51.100.2 
 Status codes: * - valid, > - best, d - damped,
               h - history,  i - internal, s - suppressed, S - Stale
               Origin : i - IGP, e - EGP, ? - incomplete


 Total Number of Routes: 2
      Network            NextHop        MED        LocPrf    PrefVal Path/Ogn

 *>i  192.0.2.0/26       198.51.100.1               100        0      i
 *>   192.0.2.128/26     0.0.0.0         0                     0      i

[Huawei]ping 192.0.2.1
  PING 192.0.2.1: 56  data bytes, press CTRL_C to break
    Reply from 192.0.2.1: bytes=56 Sequence=1 ttl=64 time=1 ms
    Reply from 192.0.2.1: bytes=56 Sequence=2 ttl=64 time=1 ms
    Reply from 192.0.2.1: bytes=56 Sequence=3 ttl=64 time=1 ms
    Reply from 192.0.2.1: bytes=56 Sequence=4 ttl=64 time=1 ms
    Reply from 192.0.2.1: bytes=56 Sequence=5 ttl=64 time=1 ms

  --- 192.0.2.1 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 1/1/1 ms



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