It is HSRP Version 1 and I assume that the primary path between the SVIs is the VPC Peer Link when it is up. ... View more

Let me make sure I've got what you are saying: "This is why it is possible to use VPC to non-NEXUS switches. Provided the two rules above is followed. i.e. the non-NEXUS switches or even a NEXUS switch can be used (NO VPC) if only local interfaces are used to make up the etherchannel . The other end of the logical port-channel, however may terminate on two N5K or two N7K switches. These devices will have to be setup with the VPC config listed above since the same logical port-channel has physical interface across more than one switch." 1). The result of making either the non-Nexus switch (or Nexus without VPC config) would be that spanning tree would block a trunk configured between these two devices, correct? 2). If so, does this slow convergence significantly in a RPVST+ design? 3). The Port Channel number on the two non-Nexus switches (or Nexus without VPC config) should be unique? I know they don't have to match end-to-end, but does it matter if they are the same on all devices? Nexus and non-Nexus? 4). What are the ramifications in terms of convergence, etc. when only the Nexus side knows that a VPC is present? Thanks! ... View more

Thanks, let me get back to you on the HSRP version and the path between the SVIs. ... View more

Excellant response. This relates to another post I just made. What are the guidlines when running VPCs between VDCs? Do both need a peer domain, peer link and peer-keepalive link or just the VDC that has STP root, etc? ... View more

Yes, thank you very much!!!!! ... View more

Thanks. I thought this was the case. Have you noticed that if you do "feature udld" only in the admin vdc (vdc id 1) that if you go into any other vdc and do a "show feature" it will say "udld disbabled"? I think this is misleading because it implies that no 10Gbps fiber port in the current (non-admin) vdc is NOT using UDLD. I can't find a command to "show" if a particular interface is using UDLD. Is there such a command? ... View more

The first Nexus data center I built was a Nexus 7010 and 5020 environment. I used mgmt0 for vpc peer keep alive because Cisco told me I HAD to use this interface for vpc peer keep alive. This was over a year ago and I could not get VPC to work until I took this advice. This data center was very stable. I am now troubleshooting a very unstable environment that has a number of issues. It is strictly a Nexus 7010 environment with two N7Ks that have 4 VDCs each. They are running OTV as well. They have no Nexus 5Ks. One VDC is for Admin, one is Core, one is aggregation (the only one with VPCs) and one is for OTV. I'm just trying to eliminate anything that could be causing instablity so I was going to recommend that they move vpc peer keepalive to mgmt0 rather than using a vrf. How about CMP? I usually put that on the same out-of-band management network infrastructure that I put mgmt0 on. ... View more

Is there any chance that a VPC Peer Link is requiredbetween core VDCs even without VPCs between core and aggregation (strictly layer 3) just to keep the Active/Active and Primary/Secondary (not STP, VDC "synchronization") processes funtioning properly? ... View more