If I have a router that has several LANs on it, and each of these LAN is attached to a second router, do I need to use different HSRP groups for each LAN?
With this set up, each virtual gateway will be on a Layer 2 segment. And within a router, no interface will have multiple gateways.
So, For example:
F0/0: ip address 192.168.1.2 255.255.255.0 standby ip 192.168.1.1 F2/0: ip address 192.168.2.2 255.255.255.0 standby ip 192.168.2.1
F0/0: ip address 192.168.1.3 255.255.255.0 standby ip 192.168.1.1 F2/0: ip address 192.168.2.3 255.255.255.0 standby ip 192.168.2.1
Will this work, or do I need
standby 1 ip 192.168.2.1 on the F2/0 interfaces? (When no group is specified, the default group is 0.) Since according to the RFC, the group number of the packet is in the HSRP multicast packets, my guess is that I don't need different groups, and that multiple groups are only needed when they are all on the same Layer 2 segment. However, I haven't been able to find this setup....