Joe Greco wrote:
For those unfamiliar, Cogent has a system where you set up an EBGP peering with the Cogent router you're connected to, for the purposes of announcing your routes into Cogent. However, these are typically smaller, aggregation class routers, and do not handle full tables - so you don't get your routes from that router. To get a full table FROM Cogent, you need to set up an EBGP multihop session with them, to their nearest full-table router. I believe they actually do all their BGP connections in that manner. Depends on the service you purchase. Fast Ethernet seems to be delivered as eBGP-multihop (the first hop is just a L3 switch), however DS-3 is handled as a single BGP session. I'm not sure if GigE or SONET services are handled as multihop or not.
Probably all depends what hardware they have at each POP.... _______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog