nanog mailing list archives
Re: [Nanog] Cogent Router dropping packets
From: David Coulson <david () davidcoulson net>
Date: Mon, 21 Apr 2008 12:02:49 -0400
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
Current thread:
- Re: [Nanog] Cogent Router dropping packets Mike Fedyk (Apr 18)
- Re: [Nanog] Cogent Router dropping packets Martin Hannigan (Apr 19)
- Re: [Nanog] Cogent Router dropping packets manolo (Apr 19)
- Re: [Nanog] Cogent Router dropping packets Paul Wall (Apr 20)
- Re: [Nanog] Cogent Router dropping packets Joe Greco (Apr 21)
- Re: [Nanog] Cogent Router dropping packets David Coulson (Apr 21)
- Re: [Nanog] Cogent Router dropping packets Joe Greco (Apr 21)
- Re: [Nanog] Cogent Router dropping packets manolo (Apr 21)
- Re: [Nanog] Cogent Router dropping packets John van Oppen (list account) (Apr 21)
- Re: [Nanog] Cogent Router dropping packets Paul Wall (Apr 21)
- Re: [Nanog] Cogent Router dropping packets manolo (Apr 22)
- Re: [Nanog] Cogent Router dropping packets David Coulson (Apr 22)
- Re: [Nanog] Cogent Router dropping packets Joe Greco (Apr 22)
- Re: [Nanog] Cogent Router dropping packets manolo (Apr 22)
- Re: [Nanog] Cogent Router dropping packets manolo (Apr 19)
- Re: [Nanog] Cogent Router dropping packets Martin Hannigan (Apr 19)
- <Possible follow-ups>
- Re: [Nanog] Cogent Router dropping packets John van Oppen (list account) (Apr 22)
- Re: [Nanog] Cogent Router dropping packets Pete Templin (Apr 22)