Prioritization, Redundancy, and Failover

Prioritization, Redundancy, and Failover
If the AVG fails, then an election takes place to determine which AVF will take over and be
responsible for allocating MAC addresses. This election uses the same principle as the initial
election, and the remaining routers select a new AVG based on the (configurable) priorities of
the remaining routers. The highest priority wins. To configure the priority on an interface in
GLBP mode, use the glbp group priority level interface command.
As with HSRP, the ability for a higher priority router to become the AVG—and even the
delay before the election is forced—can be configured. To do either of these things, use the interface
command glbp group preempt [delay minimum seconds].
Additionally, interfaces can be tracked (as in HSRP), with the result that failed interfaces
cause the priority of a router to be reduced by a configurable amount. This has the effect of
forcing a new election for the position of AVG. To track interfaces and change the priority
based on an interface failure, use the interface command glbp group weighting track
object-number [decrement-value].