Configure association between VRRP and the interface status for S series switches

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Association between VRRP and the interface status can be configured on S series switches (S1700 excluded). VRRP uplink interface tracing can be configured to ensure that the master priority is reduced when the tracked interface is faulty. A VRRP master/backup switchover is then triggered to switch links and minimize the impact of interface faults on service forwarding.

The configuration method is as follows:

Run the interface interface-type interface-number command to enter the interface view where the VRRP group resides on the master device.

2. Run the vrrp vrid virtual-router-id track interface interface-type interface-number [ increased value-increased | reduced value-reduced ] command to associate the VRRP group with the interface status for uplink interface tracing.

It should be noticed that when association between the VRRP group and the interface status is configured, master and backup devices in the VRRP group must work in preemption mode. It is recommended that you configure immediate preemption for the backup device and delayed preemption for the master device.

Other related questions:
Example of configuring association between VRRP and the interface status to monitor uplink interfaces on an AR router
An example of configuring association between VRRP and the interface status to monitor uplink interfaces on an AR router is as follows: Associate VRRP with the interface status to detect faults of uplink interfaces and switch over between the master and backup gateways. For details about the configuration, see the URL: Example for Configuring Association Between VRRP and the Interface Status.

Why can association between BFD session status and interface status on S series switches be used only on multicast BFD sessions
For S series switches, a multicast BFD session uses multicast packets and is not affected by the protocol status on an interface. When the BFD session goes Down and the protocol status on the interface changes to BFDSatusDown, multicast BFD packets can still be sent. After the link recovers, the multicast BFD session becomes Up after negotiation. As a result, the interface is unlocked and becomes Up. Unicast packets, however, cannot be sent or received after the protocol status on the interface goes Down, which causes deadlock.

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