Establishing The Configuration Task; Tracking The Status Of A Bfd Session - Huawei Quidway S3700 Series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability

7.5.1 Establishing the Configuration Task

Applicable Environment
VRRP can monitor the BFD session status. When the BFD session status changes, the VRRP
module is notified so that fast switchover is implemented.
A VRRP group can track the status of multiple normal BFD sessions or interfaces.
When a VRRP group tracks several normal BFD sessions, status changes of one BFD session
do not affect the status of the other BFD sessions.
When the status of a traced normal BFD session changes, the priority of the switch is changed
to trigger the switchover. When the status of the tracked BFD session recovers, the priority of
the switch is restored.
Pre-configuration Tasks
Before configuring VRRP to track the BFD session status, complete the following tasks:
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Data Preparation
To configure VRRP to track the BFD session status, you need the following data.
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7.5.2 Tracking the Status of a BFD Session

By tracking a BFD session, a VRRP backup group can perform the fast VRRP switchover when
being notified by the BFD session of the status change.
Context
Do as follows on the S3700 that requires the fast VRRP switchover.
Perform the following step as required based on whether VRRP for IPv4 or VRRP for IPv6 is
adopted.
Issue 01 (2011-10-26)
Configuring network layer attributes of interface to ensure network connectivity
Configuring a VRRP group
Creating BFD sessions
Data
VRRP group ID
ID or name of the tracked BFD session
NOTE
When configuring fast VRRP switchover, if VRRP monitors the peer BFD session, you must configure
peer BFD sessions on both the master router and the backup router. Otherwise, VRRP flapping occurs.
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