nanog mailing list archives
Re: Cogent/Level 3 depeering
From: Pete Templin <petelists () templin org>
Date: Wed, 05 Oct 2005 15:57:54 -0500
Justin M. Streiner wrote:
Remember that when backbones peer with each other, they typically (and as normally dictated by peering policies on both sides) only announce their own routes and the routes of their downstream customers and agree not to announce a default route to each other. They do not announce a full routing table to each other. Upshot: When provider X de-peers provider Y, single-homed customers of either provider will likely have problems reaching single-homed sites of the other.
That assumes that both are transit-free networks. We've already heard that Cogent buys some form of fill-in transit from Verio, perhaps for a subset of {AOL/ATDN, Sprint, others}. Assuming such, why aren't routes appearing in L3's routers with paths matching _2914_174_? L3 might be filtering them out (automatically or manually; perhaps filters haven't auto-generated yet), or Cogent might be requesting that they be filtered (Verio's community structure allows this quite easily). Conversely, why aren't routes appearing in Cogent's routers with paths matching _2914_3356_? If Cogent is buying transit from Verio, they should be receiving a full table.
Anyone have any inside connections to expose the truth(s) here? pt
Current thread:
- Re: Cogent/Level 3 depeering, (continued)
- Re: Cogent/Level 3 depeering Mike Tancsa (Oct 05)
- Re: Cogent/Level 3 depeering Richard A Steenbergen (Oct 05)
- Re: Cogent/Level 3 depeering John Curran (Oct 05)
- Re: Cogent/Level 3 depeering Simon Lockhart (Oct 05)
- Re: Cogent/Level 3 depeering Jeff Shultz (Oct 05)
- Re: Cogent/Level 3 depeering Micheal Patterson (Oct 05)
- Re: Cogent/Level 3 depeering Chris Stone (Oct 05)
- Re: Cogent/Level 3 depeering Alex Rubenstein (Oct 05)
- Re: Cogent/Level 3 depeering Jeff Shultz (Oct 05)
- Re: Cogent/Level 3 depeering Justin M. Streiner (Oct 05)
- Re: Cogent/Level 3 depeering Pete Templin (Oct 05)
- Re: Cogent/Level 3 depeering Chris Stone (Oct 05)
- Re: Cogent/Level 3 depeering Patrick W. Gilmore (Oct 05)
- Press Re: Cogent/Level 3 depeering William Allen Simpson (Oct 06)
- Re: Press Re: Cogent/Level 3 depeering JC Dill (Oct 06)
- Re: Cogent/Level 3 depeering Daniel Golding (Oct 05)
- Re: Cogent/Level 3 depeering jmalcolm (Oct 05)
- Re: Cogent/Level 3 depeering Patrick W. Gilmore (Oct 05)
- Re: Cogent/Level 3 depeering Randy Bush (Oct 05)
- Re: Cogent/Level 3 depeering Dave Stewart (Oct 05)
- Cogent/Level 3 drama, why it's the best news of the day! Peter Kranz (Oct 05)