I have a very wierd confusion!
Does it really required to have two routers of same IOS version/model/running-config for running them for HSRP? Why I'm asking this is : I have two offices which connect through a metro ethernet (each ofice has one 1841 router). Can I run HSRP for atomatic-failover? This would be auto-failover for ISP link-failure, not hardware failure i.e. if one link goes down the internet should work from other router's link. Kindly drop in your thoughts!