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I have referred few new

I have referred few new documents from ciscowhich are saying now it is possible to set up peer adjacency between Layer 3 device and vPC peer without separate Layer 3 links. Is it really the case or still we are having few limitations? I hope we don't have a note which says it is mandatory to use Saperate Layer 3 link for Layer 3 adjacency between layer 3 devices with VPC peer.


Hi Guys,

Hi Guys,

for me is not clear if also peer link should use F2E or F3 or it is mandatory use F2E or F3 only for the vPC to whic my router is attached?


Not intend to hi-jack the

Not intend to hi-jack the post but is your topology similar to mine? I use EIGRP instead of OSPF though.

Re: Hi,I agree that it's

please clarify the Routing over vPC support on Pre and Post 7.X nx-os on Nexus 7000


vPC Over routing issue Pre 7.x setup (nexus 7000):


confused whether the issue was not be able to form ospf neighbourship between an Layer-3 device and vPC peers (both) or the issue was with routed traffic routed to vPC peer over the peer link will not be forwarde to another link?


Dynamic routing protocol uses multicast hello messages in most cases and multicast traffic recieved on vPC member port will always will be forwarded across the peer-link? then what was stopping it from peering across peer-link? why the TTL is becoming an issue for a Layer-2 switched traffic?


let's asume we can peer each other, then why the peer-gateway feature will not stop the traffic from crosing peer-link in pre 7.x NX-OS?


Post 7.x:


it is required to enable peer-gateway feature and routing metric should be same. so does the layer-3 vPC routing solves the TTL Issue or unpredictable Traffic forwarding behaviour in pre 7.x deployment?

ajc Frequent Contributor
Frequent Contributor

Re: Hi,The Cisco Nexus 7000

Hi Steve, are Brad examples from 2010 still valid? .Based on your note from 2015 to the following link:


has changed, the references to your note from 2015 are now different. After reading Brad Blog, the examples, I assume for Diagram # 3 the blue individual links to each FW are VPC PORT Members and that's why it does not work (loop avoidance takes place).


I am also not clear how the Peer Gateway works when Brad said it does not help on Diagram # 2. Any explanation you could kindly provide on this topic? How the traffic flows when the Peer Gateway is used? 




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