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Configuration Guide - Reliability

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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If the Virtual Router Redundancy Protocol (VRRP) master fails, the VRRP backup with the highest priority quickly takes over traffic to minimize service interruption.

VRRP determines whether to perform preemption based on the timeout interval of the backup. The switchover takes longer than 1 second. BFD can be used to quickly detect the master status and further minimize traffic interruption. BFD monitors 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 group implements a rapid active/standby VRRP switchover by tracking the BFD session status. The switchover time is less than 50 milliseconds.


Figure 2-9 BFD for VRRP

In Figure 2-9, SwitchA and SwitchB establish a VRRP group. SwitchA functions as the master and SwitchB functions as the backup. User traffic is transmitted through SwitchA. SwitchA and SwitchB establish a BFD session and the VRRP group tracks the BFD session status. When the BFD session status changes, the priority is changed for the VRRP group, triggering a rapid active/standby switchover.

The rapid active/standby VRRP switchover process is as follows:
  1. When a BFD session detects a link fault between SwitchA and SwitchC, BFD reports a Down event to VRRP.
  2. The priority of SwitchB increases above the priority of SwitchA.
  3. SwitchB becomes the master switch immediately, and subsequent user traffic is forwarded through SwitchB.
Updated: 2019-03-21

Document ID: EDOC1000166606

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