nanog mailing list archives
Re: Order of ASes in the BGP Path
From: Paul Jakma <paul () clubi ie>
Date: Mon, 29 Aug 2005 19:50:18 +0100 (IST)
On Mon, 29 Aug 2005, Abhishek Verma wrote:
Legend: {} denotes the sequence, while [] denotes the set Path {1 2} [3 4] {5} Would somebody mind if this was represented as {1 2 5} [3 4] ?
Yes, they are different paths. You are allowed to merge adjacent sequences, eg:
{1 2} {5} [3 4] the two sequences can be merged, to give: {1 2 5} [3 4]You can *not* merge AS_SET's, as the current BGP specs imply an AS_SET has a fixed path-length, hence you should NOT merge the sets in:
{1 2} [3 4] [5 6] into: {1 2} [3 4 5 6]as the former path has a length of 3, the latter a length of just 2 - merging sets could change their meaning. Note though that you're not at all likely to see such paths with BGP speakers implementing the RFC / draft-ietf-idr-bgp-26.txt draft.
regards, -- Paul Jakma paul () clubi ie paul () jakma org Key ID: 64A2FF6A Fortune: The best way to make a fire with two sticks is to make sure one of them is a match. -- Will Rogers
Current thread:
- Order of ASes in the BGP Path Abhishek Verma (Aug 29)
- Re: Order of ASes in the BGP Path Richard A Steenbergen (Aug 29)
- Re: Order of ASes in the BGP Path Abhishek Verma (Aug 29)
- Re: Order of ASes in the BGP Path Randy Bush (Aug 29)
- Re: Order of ASes in the BGP Path Abhishek Verma (Aug 29)
- Re: Order of ASes in the BGP Path Stephen J. Wilcox (Aug 30)
- Re: Order of ASes in the BGP Path Jake Khuon (Aug 30)
- Bellsouth.net Outage? Alan Spicer (Aug 30)
- Re: Bellsouth.net Outage? Jon Lewis (Aug 30)
- Re: Order of ASes in the BGP Path Abhishek Verma (Aug 29)
- Re: Order of ASes in the BGP Path Richard A Steenbergen (Aug 29)
- Re: Order of ASes in the BGP Path Randy Bush (Aug 29)
- Re: Order of ASes in the BGP Path Tom Sanders (Aug 29)
- Re: Order of ASes in the BGP Path Paul Jakma (Aug 29)
- Re: Order of ASes in the BGP Path Abhishek Verma (Aug 30)
- <Possible follow-ups>
- Re: Order of ASes in the BGP Path Robert Bonomi (Aug 29)
- Re: Order of ASes in the BGP Path Paul Jakma (Aug 29)
- Re: Order of ASes in the BGP Path Tom Sanders (Aug 29)