I work for a company and we want to implement HSRP. We are a small ISP and most of our customers come into a fastethernet port on subinterfaces. We have fastethernet 0/1.100 through 0/1.125. So 25 customers, each with their own network addressing come into this one port.
The problem is, some of these network are /30 so there is only room for two usable IP addresses....it doesnt seem like I can implement HSRP in this instance UNLESS I can make the Virtual HSRP (standby IP) address the current default gateway of the user and then put a completely different network address on the two physical ethernet interfaces.
Does that make sense? So if customer has the 10.0.0.0/30 network, then he is 10.0.0.1 and I am 10.0.0.2. Can I make the Standby IP of the router to be 10.0.0.2 and then change the physical address of the ethernet port on each router to be say on the 172.16.0.0/30 network?
If so, how would the routing work.
I have always gotten good feedback here, I hope it happens again.