This is a problem which is perhaps solvable via BGP4 or even otherwise... I have a network of cisco routers (csc3), running cisco IGRP. I carry the end-site networks in the IGP. The border gateway to the ENSS runs igrp as well as BGP. a----------+-A----------C-+-----ENSS ----- NSFnet b---------/ | | | | | | c----------+-B----------D | d---------/ \------ x -------- y In the above picture, I denote my backbone routers as capital A B C D and I am using lowercase 'a b c d' for the end sites. All the backbone routers run IGRP and carry full end site routing information. The problem I am having is in routing for/to 'y' a, c, x, y all are belonging to the same company and 'x' desires that traffic from 'a' and 'c' to 'y' goes over the x-y private link. However, traffic from the non-company sites (b & d) should flow via the ENSS and then to 'y'. How do I tell the routers 'C' and 'D' to send traffic from 'a' and 'c' via the private link x-y and all other traffic via the ENSS ? If a packet arrives at D destined for 'y', then I don't see any way of *forwarding* it to 'x' or 'C' based on the *source* address. I was reading about 'encapsulation' in the 'bgp-application' draft, but has that been implemented yet ? Should I not carry the 'a' 'c' 'x' & 'y' routes in my igrp and just use IBGP ? If so, then do I need to create an IBGP peer mesh with all routers in my network ? Will that give me the capability to route traffic based on the *source* network address ? Lastly, note that I have drawn a simplistic view of the net... in actuality, there are a lot more backbone and end routers involved. Thanks, -vikas (609) 897-7307 vikas@jvnc.net ...rutgers!jvncnet!vikas -------------------------------------------------------------------------