Renan, thank you for your diligence. Well, I do understand how the AS path is built but, sorry for the long sentences I made in the previous mail, I just wanted to know if sFlow had a say in whether to represent this AS path as a set (unordered) or as a sequence (ordered). In the latter case, it may possible for the sFlow administrator to force the representation of this AS path. Isn't it?
Gregory ----- Original Message ----- From: Renan M Alves <renanmal...@gmail.com> Date: Thursday, January 15, 2009 4:29 am Subject: Re: [sFlow] AS sets and sequences > Gragory, > > the order of ASs in a AS path is totaly determined by the routing > protocol,commonly BGP, and represent the best path between two > points (ASs). > Sflow can't do anything about this, it just show what BGP decide. > > > > > On Wed, Jan 14, 2009 at 3:29 PM, <greg...@is.naist.jp> wrote: > > > Hello, > > > > I may have missed something in the RFC, but I was not able to > determine why > > the destination AS path can sometimes be represented as a set > (unordered set > > of ASs) or sometimes as a sequence (ordered set of ASs). Is it > bound to the > > proximity of the destination? For example, in a case where the > packet is > > sampled far from its destination and there are still many ASs to > cross, not > > ordering the ASs in the destination AS path may save processing > time (?). > > Or is there a totally different reason to this distinction? > > Moreover, is it possible to force the AS path to be either one or > the other > > in some sampling device implementations, especially routers? I > can not > > recall anywhere to configure the way the AS path is exported on > the devices > > I use. So I was wondering if it was automatically determined by an > > algorithm. > > > > Well, my reasoning is way too long. Sorry. > > > > Thanks for the answer, > > > > Gregory.
