Have two routers (A and B) setup on the same LAN (10.208.16.x/24). A is the primary and B is secondary HSRP routers.
Since the two interfaces are both up, both routers advertise the route to 10.208.16.x/24. When I set the metrics the same, everything works as long as both routers and interfaces keep working. To keep asymmetric routes from occuring, I have changed the metric for the path to router A to make it preferred. Everything is stable. If router A fails or the Interface fails or goes DOWN (keyword), then B takes over and the only route the system sees if to B. However, if the interface on router A does not go DOWN, router A will continue to advertise the route (a preferred route) to 10.208.16.x/24. The cases I have found when the router A interface does not go down are when the VLAN is corrupted between routers A and B, and when a switch link failure splitting a VLAN into two segments. In both cases, I effectively get TWO primary HSRP routers and routes advertised by both for the same subnet.
1) How can I link the advertisement of an Interfaces IP subnet to the state of HSRP (Primary-advertise; Secondary-don't).
2) How can I make HSRP work (with some help) in a split LAN situation? (At least until I can get it fixed.)
3) Is there any configuration (on the HSRP side to a single LAN) that avoids this problem?