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Cisco 3945 Active/Standby with Nexus 2k


I wonder if someone has done this before and can help me with this solution.

I am deploying a 3945 connecting via gigabit to a Nexus 2k and want to connect both Gi0/0 and Gi0/1 to the Nexus 2k for active/standby.

Is this possible? Will I be able to assign the same IP to both interfaces or do I go IP Unumbered witj a loopback interface for interfacing with the CUCM 9?

See atached JPG please

Voice CCIE #37771
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Cisco 3945 Active/Standby with Nexus 2k

If you really want to connect both Gig interfaces to the Nexus 2K (assuming that both N2K interfaces are in the same vlan) then I do not believe that IP unnumbered will work. I would suggest that you look into using Integrated Routing and Bridging. You would configure bridging on the 3945, put both Gig interfaces into the same bridge group, and configure a BVI for the bridge group and the IP address goes on the BVI.



Re: Cisco 3945 Active/Standby with Nexus 2k

Is there more to your setup then is indicated in your diagram? You cannot just connect a FEX to a router you need the FEX to be connected back to a nexus mother switch.

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