I am having an issue between two routers running HSRP.
Both routers are running as being the Active Router. At first i thought that the LAN connection between the two had failed, but they can still both ping each other and when I run "sh cdp neighbors" each router shows up in the respective output, yet "sh standby" shows that both show the "active router" as local and the "standby router" as unknown.
I recently met 3Com switches in default configuration blocking multicasts and making VRRP not working so.
It could be the same case with HSRP.