From: Richard Foltz (ccie2b@xxxxxxxxxx)
Date: Thu Nov 29 2001 - 13:03:57 GMT-3
the only exception i know to that is to remove private AS #s from the path,
which is allowed.
Richard Foltz, CCIE#8339, CCNP-Voice, CCDP, MCSE+I, Network+, A+
----- Original Message -----
From: "Nigel Roy" <nigel@system-link.co.uk>
To: <ccielab@groupstudy.com>
Cc: "fwells12" <fwells12@hotmail.com>
Sent: Thursday, November 29, 2001 9:33 AM
Subject: Re: BGP regular expressions
> I haven't seen anyone else answer so I thought I would put you out of your
> misery.
>
> In short no you can't. You can identify any individual part of your AS
path
> with all sorts of wonderful regular expressions but the only thing IOS
> allows you to do to change an AS path is to add or "prepend" AS numbers to
> it. It would be potentially dangerous to remove AS numbers from the path
as
> the AS path is used in loop prevention.
>
> Nigel Roy CCIE #1405
>
> ----- Original Message -----
> From: "fwells12" <fwells12@hotmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, November 28, 2001 9:46 PM
> Subject: BGP regular expressions
>
>
> > I have been playing with regular expressions but I have not found one
that
> > will do this yet -if there is one...
> >
> > I want to take a particular AS OUT of an as path? Lets say you have
some
> > routes that traverse the ASs' 100 200 300 400 500 on their way to a BGP
> > speaker. I would like to be able to use one of the routers in that path
> to
> > take its own AS out of the path. For example, using the above AS path,
> can I
> > make Router200 take its own AS (200) out of path it advertises to
> downstream
> > BGP speakers.
> >
> > The result I want is that Router500 (furthest downstream bgp speaker)
> see's
> > networks on Router100 with the following AS path: 100 300 400 500. Can
> this
> > be done, even though AS 200 is actally part of the physical route?
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