VSS in 4500X with vPC to Nexus 7K issue

[andrewchan01]

I want to know if I have pair of Cisco 4500X that form VSS and each of 4500X has 1 link to one of the N7K.

Is it similar with a Server(pair of 4500X with VSS) using vPC to the N7K?

What is the mac-address learning behaviour?         

[chrconlo]

Not sure of the exact nature of this question. Either side of the VSS/vPC will see the other side as a single device connceted to a port-channel. There is no control-plane awareness between VSS/vPC. As a result vPC MAC learning behavior does not change if connected to VSS.

Here is the 6500 VSS / vPC Interop Guide which should apply similarly:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11_589890.html