Redundant interface pairs like ASA on routers?

Unanswered Question
Jun 6th, 2008

I'm designing and configuring a new network and I would like to connect one router with two interfaces to the same spanning tree domain (a couple of switches). A third interface is going to another subnet.

I would like to have the two interfaces to be redundant and provide subsecond failover. So a BVI with spanning tree on the router is not really an option.

Is it possible to configure redundant interface pairs like ASA 8.0 on a router? Or is there another way to accomplish this?

I have this problem too.
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cowetacoit Fri, 06/06/2008 - 12:50

So two router interfaces connected to the same switch? or each router interface connected to a different switch?

2044418Puts Sat, 06/07/2008 - 07:06

The two interfaces are connected to different switches, but connected to the same layer 2 domain / vlan / spanningtree domain.

andrew.butterworth Sat, 06/07/2008 - 08:03

You could do it with bridging on the router:

bridge 1 protocol ieee

bridge irb


interface FastEthernet0/1

bridge-group 1


interface FastEthernet0/2

bridge-group 1


interface BVI 1

ip address




2044418Puts Sat, 06/07/2008 - 08:19

Yes this is an option, but I would like to have subsecond failover between the links.

Is it possible to configure uplink fast between these links?

andrew.butterworth Sat, 06/07/2008 - 08:38

You could tune STP to try and achieve these kinds of times, however I think you want to be looking at alternative designs.

Dual routers running HSRP/GLBP is where I would be looking.



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