Configuring Association Between VRRP and Routing to Monitor the Uplink Status
Context
VRRP cannot detect faults on the uplink of a VRRP group, which may cause service interruption. The VRRP group monitors the number of routes on the uplink forwarding path. When the route is withdrawn or becomes inactive, the master's priority is adjusted and an active/standby switchover is triggered. This reduces the impact of the link fault on service forwarding.
When the fault is rectified, the original master restores its priority and becomes the master again to forward traffic.
During route association, the link switchover depends on convergence of a routing protocol associated with the VRRP group.
When a VRRP group is associated with a static route, the device can detect only faults on the direct uplink.
The master and backup in the VRRP group must work in preemption mode. It is recommended that the preemption delay be 0 on the backup and non-zero on the master.
Procedure
- Run system-view
The system view is displayed.
- Run interface interface-type interface-number
The view of the interface on the master where a VRRP group is configured is displayed.
- (Optional) On an Ethernet interface, run undo portswitch
The interface is switched to Layer 3 mode.
By default, an Ethernet interface works in Layer 2 mode.
Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.
- Run vrrp vrid virtual-router-id track ip route ip-address { mask-address | mask-length } [ vpn-instance vpn-instance-name ] [ reduced value-reduced ]
Association between a route and a VRRP group is configured.
By default, the master's priority decreases by 10 if the associated route is withdrawn or becomes inactive.
When setting the value by which the priority decreases, ensure that the priority of the backup is higher than the priority of the master.