After a recent switch deployment, I'm seeing some very strange layer 2 forwarding issues. I am uncertain if this is related to a configuration issue on my part. I would like some clarification about VPC, and I'm hoping you can help me.
It is my understanding that when you have a series of double-sided VPCs between, say, a pair of N7700 and multiple pairs of Nexus 9K or 5K switches, that all the VPC domain IDs must be different. However, a contractor told me that each VPC number - associated with the etherchannel uplink to the Nexus 7Ks - must also be unique. Attached is a diagram which illustrates my dilemma.
Question - Am I ok to reuse port-channel number Po3 with VPC number 3 for all leaf pairs, or must these be different?
