This query is regarding the virtual IP address allocation in HSRP.
What if the virtual IP chosen to be of a different subnet from the interface IP?
According to RFC 2281, this is something achievable though I'm curious to know the consequences(if any).
RFC 2281 says "The IP address SHOULD belong to the primary subnet in use on the LAN, but MUST differ from the addresses allocated as interface addresses on all routers and hosts
on the LAN, including virtual IP addresses assigned to other HSRP groups."
One question remains with respect to the subnet being used by the virtual address.
Will this address take the subnet mask of the interface address, or will just be a /32.
The other question is: what are the cons of having these assignments from two different networks?