To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.
The hsrp track command ties the Hot Standby priority of the router to the availability of its interfaces. It is useful for tracking interfaces that are not configured for the Hot Standby Router Protocol (HSRP). Only IP interfaces are tracked. A tracked interface is up if IP on that interface is up. Otherwise, the tracked interface is down.
When a tracked interface goes down, the Hot Standby priority decreases by 10. If an interface is not tracked, its state changes do not affect the Hot Standby priority. For each group configured for Hot Standby, you can configure a separate list of interfaces to be tracked.
The optional priority-decrement argument specifies by how much to decrement the Hot Standby priority when a tracked interface goes down. When the tracked interface comes back up, the priority is incremented by the same amount.
When multiple tracked interfaces are down and priority-decrement values have been configured, these configured priority decrements are cumulative. If tracked interfaces are down, but none of them were configured with priority decrements, the default decrement is 10 and it is cumulative.
The hsrp preempt command must be used in conjunction with this command on all routers in the group whenever the best available router should be used to forward packets. If the hsrp preempt command is not used, then the active router stays active, regardless of the current priorities of the other HSRP routers.
In the following example, Ten Gigabit Ethernet interface 0/2/0/1 tracks interface 0/1/0/1 and 0/3/0/1. If one or both of these two interfaces go down, the Hot Standby priority of the router decreases by 10. Because the default Hot Standby priority is 100, the priority becomes 90 when one of the tracked interfaces goes down and the priority becomes 80 when both go down.
RP/0/RP0/CPU0:router(config)# router hsrp
RP/0/RP0/CPU0:router(config-hsrp)# interface TenGigE 0/2/0/1
RP/0/RP0/CPU0:router(config-hsrp-if)# hsrp track TenGigE 0/1/0/1
RP/0/RP0/CPU0:router(config-hsrp-if)# hsrp track TenGigE 0/3/0/1
RP/0/RP0/CPU0:router(config-hsrp-if)# hsrp preempt
RP/0/RP0/CPU0:router(config-hsrp-if)# hsrp ipv4 188.8.131.52