[83874] in North American Network Operators' Group
Re: Order of ASes in the BGP Path
daemon@ATHENA.MIT.EDU (Abhishek Verma)
Tue Aug 30 05:28:53 2005
Date: Tue, 30 Aug 2005 14:58:24 +0530
From: Abhishek Verma <abhishekv.verma@gmail.com>
To: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
Cc: nanog@nanog.org
In-Reply-To: <Pine.LNX.4.44.0508292116580.1697-100000@server2.tcw.telecomplete.net>
Errors-To: owner-nanog@merit.edu
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>=20
>=20
> > As no one has asked yet, allow me.. what are you trying to do?
Basically I was thinking on these lines.
If i have an AS path {1 2} [3 4] { 5 } then is it possible to pull the AS=
=20
in the last segment and merge it with the first segment? This would give me=
=20
{1 2 5} [3 4]. This way i dont need to carry two AS_SEQ segments in my path=
=20
and i can manage with just one.
However, there are some problems here:
[1] I can never generate such an AS Path, given the way BGP works=20
currently.
[2] Merging ASes from different segments can mangle the sequence in which=
=20
the ASes appear in the AS Path. I wanted to know if this was required and=
=20
used by admins, and hence my original mail.
Thanks everybody for all the help,
Abhishek
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<div>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>> As no one has asked yet=
, allow me.. what are you trying to do?</blockquote>
<div> </div>
<div>Basically I was thinking on these lines.</div>
<div> </div>
<div>If i have an AS path {1 2} [3 4] { 5 } then is it possible to pul=
l the AS in the last segment and merge it with the first segment? This woul=
d give me {1 2 5} [3 4]. This way i dont need to carry two AS_SEQ segments =
in my path and i can manage with just one.
</div>
<div> </div>
<div>However, there are some problems here:</div>
<div> </div>
<div>[1] I can never generate such an AS Path, given the way BGP works curr=
ently.</div>
<div> </div>
<div>[2] Merging ASes from different segments can mangle the sequence in wh=
ich the ASes appear in the AS Path. I wanted to know if this was required a=
nd used by admins, and hence my original mail.</div>
<div> </div>
<div>Thanks everybody for all the help,</div>
<div> </div>
<div>Abhishek</div></div>
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