I'm trying to learn about these two HA protocols, and I have a question. From playing around with GLBP, it seems as though it doesn't change the AVG unless the Active one goes down which will then force the Standby to become active. In the case of HSRP, if you are tracking an interface that goes down, the standby will automatically come up.
In my other tests, I noticed that the AVF DID change from the active to the standby. Am I correct in the fact that the AVG physically has to die to make a standby become the active in the case of GLBP?
*** Oh, and can I equate the AVF to a physical router in HSRP? For example, in HSRP tracking an interface that goes down will make the standby active if preempt is enabled. In an AVF, weights will change the forwarders status (like HSRP), and then bring the forwarder back online when the weight is within threshold?