On 23/04/2011, at 11:08 AM, Adrian Chung wrote: > The 6500s each have two ten gigE interfaces in a port-channel connected up > to vPCs on the 7K side. On top of this, each 6500 is forming an OSPF > adjacency with each 7K. The adjacencies form without a problem, and we're > not using peer-gateway.
running a L3 routing protocol over vPC member links between SVIs is not a supported configuration (as you state). what you have may _seem_ to work today. that doesn't mean they will continue to work in future. what may cause it to stop working? well, for starters, OSPF uses a few different types of control packets. some use link-local multicast, which if they arrive on the 'right' N7K will work. but if they arrive on the 'wrong' N7K they will fail. whether a device sends to the 'right' or 'wrong' N7K depends on which physical link it chooses to use in a LAG bundle. as the neighboring device has no idea its a point-to-multipoint bundle, its not really in a position to choose the 'right' or 'wrong' link. as to how vPC does loop avoidance, its sort of beside the point as to how it actually does it - just that it _does_ do it. i don't think its a secret per-se as to how we do it, but what you've observed with routing protocols is somewhat orthogonal to that. cheers, lincoln. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
