Can I have more than two routers in the same HSRP group?

Question

I want to know if it is possible to do HSRP with 3 or more routers.

Answer 1

Yes, it is perfectly possible. From Cisco's HSRP documentation:

HSRP allows two or more HSRP-configured routers to use the MAC address and IP network address of a virtual router.

It works really the same as two, except instead of 1 in two holding the virtual ip, 1 in 3 will hold the virtual IP. By setting priorities, you can set preferences as to which will have it when all three are up, or if only two are up.