Router Hot Failover - HSRP?

Answered Question

I have two routers and would like to set these up on our network in a cluster or failover configuration. Load balancing is not necessary. I've looked at HSRP but I'm not sure if this could be used in this situation.

Router 1 (3845)

     interface 1 : Local LAN

     interface 2 : Local WAN

     interface 3 : To our Local FW cluster

Set up Router 2 (2951) to automatically become active if the primary router fails.

This is a diagram of what we are trying to accomplish:


Is HSRP the right choice?


I have this problem too.
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Jon Marshall Thu, 01/07/2010 - 14:20


That makes a bit more sense

Yes HSRP would do what you wanted. You would need to set it up for both LAN1 and LAN2.

The alternative to HSRP is GLBP. The main advantage of GLBP is that you use both routers to forward traffic because both are active. The routers themselves work out which is active for which client.

With HSRP only one router is active and the other is simply in standby mode.


Jon Marshall Thu, 01/07/2010 - 13:57

Is HSRP the right choice?


Yes this is possible. You would need to have the internal LAN interfaces of the 2951 and 3845 in the same subnet and then use a virtual address, again from the same subnet. This virtual address is what is used as the default-gateway for the clients. You make the interface on the 3845 higher priority so it is the preferred router.

What is not clear is where the WAN is oin your diagram ?

Also you would need a switch between the 2 routers and the firewall as you don't want to be using separate interfaces on the ASA. You could use a switch that is being used for the internal LAN if it supports vlans.



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