Huawei AR1200 Series - Example for Configuring Synchronization between LDP and Static Routes

area 0.0.0.0
network 3.3.3.9 0.0.0.0
network 10.3.1.0 0.0.0.3
network 10.4.1.0 0.0.0.3
#
return
l Configuration file of PE2
#
sysname PE2
#
mpls lsr-id 4.4.4.9
mpls
#
mpls ldp
#
interface GigabitEthernet1/0/0
ip address 10.2.1.2 255.255.255.252
mpls
mpls ldp
#
interface GigabitEthernet2/0/0
ip address 10.4.1.2 255.255.255.252
mpls
mpls ldp
#
interface LoopBack1
ip address 4.4.4.9 255.255.255.255
#
#
ospf 1
area 0.0.0.0
network 4.4.4.9 0.0.0.0
network 10.2.1.0 0.0.0.3
network 10.4.1.0 0.0.0.3
#
return
2.13.10 Example for Configuring Synchronization Between LDP
and Static Routes
By configuring synchronization between LDP and static routes, you can minimize MPLS traffic
loss during traffic switchover and switchback on an MPLS network with the primary link, backup
link, and LSPs depending on static routes.
Networking Requirements
On an MPLS network with primary and backup LSPs, LSRs establish LSPs based on static
routes. When the LDP session of the primary link becomes faulty (the fault is not caused by a
link failure) or the primary link recovers, LDP and static routes become unsynchronized, causing
MPLS traffic to be interrupted temporarily.
As shown in Figure 2-15, there are two static routes from LSRA to LSRD, which pass through
LSRB and LSRC respectively. LDP sessions are established based on the static routes. Link A
is the primary link, and Link B is the backup link. It is required that synchronization between
LDP and static routes be configured to ensure non-stop MPLS traffic forwarding when the LDP
session on Link A is disconnected or Link A recovers.
Huawei AR1200 Series Enterprise Routers
Configuration Guide - MPLS 2 MPLS LDP Configuration
Issue 01 (2011-12-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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