Figure 3-19 PW single-hop redundancy protection
Multi-hop PW redundancy imports S-PE between PE. S-PE connects PW on the two
ends. PE1 and PE2 sets up connection with S-PE respectively. In this way PW between
PE1 and PE2 is composed of multiple segments of PW. ZXR10 8900E series switch
supports 1:1 multi-segment PW redundancy backup. When PW1 fails, traffic can be
quickly switched to PW3 to realize fast switching between active and standby PW as
shown in Figure 3-20.
Figure 3-20 PW multi-hop redundancy protection
3.7.6.2 MPLS VPN Dual-homing Protection
1. CE Dual-homing to PE
In MPLS network, to provide network reliability and solve service interruption problem
caused by route re-convergence results from single PE failure, we import CE
dual-homing to PE solution. CE is accessed to two PE at the same time. One is active
and the other is standby. When CE perceives active PE or active link fails by LACP, STP,
ZESS, or port shutdown, it can automatically switch to standby PE and standby link.
When failure recovers, the original active PE can recover or automatically change to
standby PE based on certain strategy as shown in Figure 3-21.
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