Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

High availability question +GLBP


does anyone knows if it is possible to have 2 physical interfaces from the same router to act as if it was a single one for high availability. I want these two interfaces to connect to two different switches so I don't loose connectivity in case of a switch failure.

I would like to achieve high availability like this

RouterA (7206):

e0-> ISP A (as100)

e1-> SwitchA (vlan 100)

e2-> SwitchB (vlan 100)

RouterB (7206):

e0-> ISP B (as200)

e1-> SwitchC (vlan 100)

e2-> SwitchD (vlan 100)

The switches would be connected in the following way


Doing so, I could lose a switch without losing connectivity at all. If a switch goes down, spanning tree will put one of the port from blocking to forwarding and the traffic will continue to flow

I will be using GLBP between both routers for outgoing redundancy.

So is there a way that the two interfaces from the same routers act as one ?



Re: High availability question +GLBP

yes it is possible to create multilink by for sending traffic.These multiple routes to a destination are compared by their metrics, and the shortest path is installed in the routing table. If there is more than one path with the same least metric value, all least-metric routes are installed in the routing table. To determine the number of routes that be installed based on the value configured for the protocol, issue the maximum-paths command