nanog mailing list archives
Re: Open Source BGP Route Optimization?
From: "Sam Stickland" <sam_ml () spacething org>
Date: Fri, 28 May 2004 18:27:33 +0100
Per Gregers Bilse <bilse () networksignature com> wrote:
On May 28, 10:37am, "Sam Stickland" <sam_ml () spacething org> wrote:Are there any BGP extensions that would cause a BGP speaker to foward all of it's paths, not just it best? I believe quagga had made some recent attemptsIt has been discussed and been on wish lists, but:in this direction. IIRC the problem isn't to do with the route annoucements, it's the route withdrawals. I believe BGP only specifies the prefix being withdrawn and not the path, so if it's advertised multiple paths to a prefix it's impossible to know which has been withdrawn.That is 100% correct, yes. Selective withdrawal is not supported. Another issue is that there isn't much point, as far as regular BGP and routing considerations go. Whichever is the best path for a border router is the best path; telling other routers about paths it will not use serves no (or at best very little) point in this context.
Well something came up recently on a transit router. It takes multiple Tier-1 feeds, but management wanted to sell a just MFN to a customer. It's possible to policy route all of their traffic to the MFN interface and only advertise their prefixes to MFN, but not possible to only feed them the MFN routes without starting to use VRFs etc. Of course this is a great perversion of resources ;) Sam
Current thread:
- Re: Open Source BGP Route Optimization?, (continued)
- Re: Open Source BGP Route Optimization? Sam Stickland (May 29)
- Re: Open Source BGP Route Optimization? Olivier Bonaventure (May 29)
- Re: Open Source BGP Route Optimization? Alexei Roudnev (May 29)
- Re: Open Source BGP Route Optimization? Sam Stickland (May 29)
- Re: Open Source BGP Route Optimization? Per Gregers Bilse (May 28)
- Re: Open Source BGP Route Optimization? Arnold Nipper (May 28)
- Re: Open Source BGP Route Optimization? Per Gregers Bilse (May 28)
- Re: Open Source BGP Route Optimization? Bruce Pinsky (May 28)
- Re: Open Source BGP Route Optimization? Sam Stickland (May 29)
- Re: Open Source BGP Route Optimization? Paul Jakma (May 29)
- Re: Open Source BGP Route Optimization? Sam Stickland (May 29)
- RE: Open Source BGP Route Optimization? Michael Hallgren (May 29)
- Re: Open Source BGP Route Optimization? Stefan Mink (May 30)
- Re: Open Source BGP Route Optimization? Per Gregers Bilse (May 30)