Routing over VPC

[ar]

I have Nexus 9500s and 9300s.

VPC enabled.

A router below is dual-homed to the 9300s

L2 Path is provided via VPC from N9300 to N9500.

Since N9500 is the L2/L3 boundary, I would like to establish IGP adjacency as below.

Is this  topology/deployment supported?

How will be the behavior of OSPF neighbors, failover in this case?

Please advise, thanks

[willwetherman]

Hi,

I suspect that this is not supported based on the following document.

http://www.cisco.com/c/en/us/support/docs/ip/ip-routing/118997-technote-nexus-00.html

If you look at 'Table 2: Routing Protocols Adjacencies Support over vPC VLANs' it states that adjacencies from vPC attached devices L3-B and L3-C to Nexus-A and Nexus-B is not supported. It doesn’t provide an example similar to yours but I'm guessing it’s still not supported as the communication will still be over a vPC VLAN.

I've not had to implement a topology like this before so someone else will need to advise if this is possible or not.

[Masoud Pourshabanian]

Hello,

By Enhanced VPC, your scenario was supported if you had nexus 5K and FEX; however, I believe, 9300s should be also VPC peers in this case.