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CLI-based Configuration Guide - Reliability

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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BFD for VRRP

BFD for VRRP

If the Virtual Router Redundancy Protocol (VRRP) master fails, the VRRP backup with the highest priority takes over traffic within a short time to shorten service interruption.

WVRRP determines whether to perform preemption based on the timeout interval of the backup. The switching takes longer than 1 second. BFD can be used to quickly detect the master status and shorten traffic interruption. BFD detects real IP addresses of the master and backup devices during communication. If communication is irregular, the backup device considers the master device to be Down and takes over. A VRRP backup group implements a master/backup VRRP switchover quickly by tracking the BFD session status. The switchover time is within 50 milliseconds.

Application

Figure 6-13  BFD for VRRP

In Figure 6-13, RouterA and RouterB establish a VRRP group. RouterA functions as the master and RouterB functions as the backup. User traffic is transmitted through RouterA. RouterA and RouterB establish a BFD session and the VRRP group tracks the BFD session status. When the BFD session status changes, the priority of the VRRP group is changed, triggering a master/backup switchover.

The fast master/backup VRRP switchover process is as follows:
  1. When a BFD session detects a link fault between RouterA and SwitchC, BFD reports a Down event to VRRP.
  2. The priority of RouterB increases above the priority of RouterA.
  3. RouterB becomes the master router immediately and subsequent user traffic is forwarded through RouterB.
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Updated: 2019-05-17

Document ID: EDOC1000174116

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