В данной статье рассматривается процесс настройки L2VPN с использованием BGP Autodiscovery и LDP для сигнализации, эта технология позволяет строить VPLS с FEC 129.
Основным отличием данного метода от Kompella-mode и Martini-mode является использование двух протоколов: BGP для обнаружения соседей и MPLS LDP для транспорта и сигнализации
В качестве IGP протокола выбран IS-IS:
router isis test
interface bundle-ether 0
address-family ipv4 unicast
exit
point-to-point
exit
interface bundle-ether 1
address-family ipv4 unicast
exit
point-to-point
exit
interface loopback 1
address-family ipv4 unicast
exit
passive
exit
ipv4-te-level level-2
is-level level-2
net 49.0000.0000.4321.00
te-router-id 2.2.2.2
exit |
Конфигурация BGP аналогична Kompella-mode, но в данном примере BGP используется только для автоматического обнаружения соседей в VPLS домене:
router bgp 1
address-family l2vpn vpls
exit
bgp router-id 2.2.2.2
neighbor 10.0.0.6
address-family l2vpn vpls <--- Обязательно добавляем соседу AFI L2VPN
exit
remote-as 1
send-community
send-community-ext
update-source 2.2.2.2
exit
neighbor 5.5.5.5
address-family l2vpn vpls
exit
remote-as 1
send-community
send-community-ext
update-source 2.2.2.2
exit
exit |
Настраиваем LDP и обязательно устанавливаем tLDP соседства:
mpls
forwarding
interface bundle-ether 0
interface bundle-ether 1
interface loopback 1
exit
ldp
discovery interface bundle-ether 0
exit
discovery interface bundle-ether 1
exit
neighbor 10.0.0.6
exit
neighbor 5.5.5.5
exit
penultimate-hop-popping disable
exit
router-id 2.2.2.2
exit |
Теперь можно приступить к конфигурированию самого L2VPN сервиса
l2vpn
bridge-domain test
autodiscovery
bgp
rd 2:2
route-target 10:10 <---Используется для изоляции PW друг от друга
export
import
exit
signaling-protocol ldp <--- Указываем LDP в качестве протокола для сигнализации.
vpls-id 100:100 <--- VPLS-ID должен быть единым для всех маршрутизаторов.
exit
exit
exit
interface tengigabitethernet 0/0/3
exit
exit
exit |
Аналогичные настройки проводим на других маршрутизаторах
Проверить статус PW можно с помощью команды "show l2vpn bridge-domain detail":
0/ME5100:R2# show l2vpn bridge-domain detail
Thu Oct 24 08:39:11 2024
MM -- mtu mismatch Up -- up GUp -- going up
CM -- control-word mismatch Dn -- down GDn -- going down
OL -- no outgoing label ST -- standby Lld -- lower layer down
BK -- backup connection Fl -- failed Drm -- dormant
SP -- static pseudowire SW -- switchover
Bridge domain: test, state: up, bridge type: vpls
MAC learning: enabled
Local switching: enabled
Flood replication point: egress
Flooding Multicast: enabled
Unknown unicast: enabled
MAC aging time: 300 s, MAC limit: 4000, Action: enabled, MTU: 1500
Oper-status: up
ACs: 1 (0 up)
PWs: 2 (2 up)
Routed interface: none
List of ACs:
AC: Tengigabitethernet0/0/3
AC binding status: going-up, Interface oper state: up
List of PWs:
List of VFIs:
List of Autodiscovery PWs:
PW: Neighbor 10.0.0.6, if-index 106, admin Up, oper Up
Status codes:
PW type: ethernet, signaling: generalized-fec-signaling, local group id: 0
Encapsulation: MPLS, control word: control-word-not-present
Vpn index: 1, type: ls
Redundancy state active, MTU: 1500
Created: 2024-10-22 09:05:55, last state change: 01d23h33m ago
Local Remote
Label 24 17
BGP Peer ID 2.2.2.2 10.0.0.6
LDP ID 2.2.2.2 10.0.0.6
AII 2.2.2.2 10.0.0.6
AGI 100:100 100:100
Forwarding true true
Customer-facing (ingress) recv fault false false
Customer-facing (egress) send fault false false
Local PSN-facing (ingress) recv fault false false
Local PSN-facing (egress) send fault false false
Switchover false false
Remote capabilities:
VC status can be signaled: false
VCCV ID can be signaled : false
Remote Control Channel (CC) supported: none
Remote Connectivity Verification (CV) supported: none
Remote node capability:
Manually set PW: false
Protocol has not yet finished cap. determination: false
Signaling the pseudowire: true
Sending the pseudowire: false
PW: Neighbor 5.5.5.5, if-index 107, admin Up, oper Up
Status codes:
PW type: ethernet, signaling: generalized-fec-signaling, local group id: 0
Encapsulation: MPLS, control word: control-word-not-present
Vpn index: 1, type: ls
Redundancy state active, MTU: 1500
Created: 2024-10-22 09:06:46, last state change: 01d23h32m ago
Local Remote
Label 25 17
BGP Peer ID 2.2.2.2 5.5.5.5
LDP ID 2.2.2.2 5.5.5.5
AII 2.2.2.2 5.5.5.5
AGI 100:100 100:100
Forwarding true true
Customer-facing (ingress) recv fault false false
Customer-facing (egress) send fault false false
Local PSN-facing (ingress) recv fault false false
Local PSN-facing (egress) send fault false false
Switchover false false
Remote capabilities:
VC status can be signaled: false
VCCV ID can be signaled : false
Remote Control Channel (CC) supported: none
Remote Connectivity Verification (CV) supported: none
Remote node capability:
Manually set PW: false
Protocol has not yet finished cap. determination: false
Signaling the pseudowire: true
Sending the pseudowire: false
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