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.
My understanding is your customers come in on one physical subinterface. The customer router and provider router establish IP connectivity over the link using /30 addresses. Or are these IP work stations? Regardless, why would you want to implement HSRP over this link? I believe HSRP would be appropriate on the customer router interface facing the LAN. And you still would require another router at the customer site to act as the Hot Standby Router.
If you are adding another provider router into the mix utilize a routing protocol or static routes for fault tolerance.
In the scenario youre describing I dont see a need for a Hot Standby Router. There might be something Im missing. If you have any further information please provide.
I currently have that config but there seems to be some sort of routing issue going from a customer side all the way through the router....I am going to look into it and maybe I can but static null routes to make it work.
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