Vince Fuller wrote:
From our point of view, we aren't seeing any route which can be used for shortest-exit to your multi-homed customers. Why? Probably because we don't peer with the other ISP which serves those customers. The result is that we have to backhaul traffic to other interconnect points, something which is expensive for us and inconsistant with our normal peering policy.
I can see why you present inconsistant routes to us but I'm not sure that I understand why you'd prefer a customer prefix via a direct connection to them at one point in your network but via a connection to another provider at a different point in your network. That would seem internally inconsistant to me. Is this deliberate behavior to do shortest-exit within your network toward your customer?
--Vince
The scenario I can think where this would happen is using BGP route-reflectors internally to reduce the intermeshing requirements for IBGP peers. Since a route-reflector only propagates the best route, it is quite easy to get different as-paths in different parts of the network. Not an ideal situation, to be sure, but "correcting" this behaviour is more than a simple fix. +j -- Jeff Rizzo http://boogers.sf.ca.us/~riz