nanog mailing list archives
Re: Open Source BGP Route Optimization?
From: Per Gregers Bilse <bilse () networksignature com>
Date: Fri, 28 May 2004 14:37:23 +0100
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 attempts
It 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 I believe BGP only specifies the prefix being withdrawn and not the path, so if it's advertised multiple paths to a prefix it's impossible to know which has been withdrawn.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. Funny coincidence, just earlier today I was talking to somebody about BGP and its general applicability, and while there can be no question that BGP has stood the test of time and achieved all its objectives, there are things one would do differently if one were to start over. But that's always the case. Best, -- Per
Current thread:
- Re: Open Source BGP Route Optimization?, (continued)
- Re: Open Source BGP Route Optimization? Jonathan M. Slivko (May 25)
- RE: Open Source BGP Route Optimization? Burton, Chris (May 25)
- Re: Open Source BGP Route Optimization? Per Gregers Bilse (May 27)
- Re: Open Source BGP Route Optimization? Bruce Pinsky (May 28)
- Re: Open Source BGP Route Optimization? Per Gregers Bilse (May 28)
- Re: Open Source BGP Route Optimization? Andrew - Supernews (May 28)
- 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? Bruce Pinsky (May 28)
- 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)