As far as HSRP is concerned I do not think there is any limitation on the number of routers in same group. Not very sure for VRRP.
You can have as many routers in one group as you want, but only two will be sending out HSRP hellos to the HSRP multicast address (the active and standby routers). All other 'inactive' routers in the standby group will LISTEN to the hellos but will not be sending. As soon as the other 'inactive' routers hear only one hello (when either the active or standby goes down) the 'inactive' router with the highest priority becomes the new standby (because if the active router goes down the previous standby becomes active and the inactive router becomes the standby or if the previous standby goes down the inactive router becomes the standby). Either way, the inactive router in the standby group with the highest priority becomes the standby router.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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