Vrrp - Next Hop Tracking - Lenovo RackSwitch G8264 Application Manual

VRRP - Next Hop Tracking

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G8264 Application Guide for ENOS 8.4
VRRP can be configured to track next hops. A health check mechanism, using
ICMP ping or ARP requests, is used to track the next hop. If the health check
succeeds or fails, the priority of the virtual router, for which the next hop tracking
was configured, changes based on the configured tracking‐priority‐increment
value.
A VRRP group's priority is calculated as the sum of all priorities for all active next
hops. If an active next hop belongs to two virtual routers, then that next‐hop's
priority is added twice.
VRRP next hop tracking can be configured using the following commands:
 Enable VRRP tracking on next hop:
RS G8264(config)# virtual-router <x> track next-hops
 Configure next hop IP address:
RS G8264(config-vrrp)# virtual-router <x> next-hop <IP address>
[ICMP|ARP] [<interval>] [<retries>]
Default Values:
Health check protocol: ICMP
Interval: 2 seconds
Retries: 3
Note: A maximum of four unique next‐hop IP addresses can be configured.
 Configure priority for each next hop.
The value is added to the virtual router's priority when the next hop is active,
and subtracted, when the next hop goes down:
RS G8264(config-vrrp)# tracking-priority-increment next-hop <0‐254>