From: Maclain John (maclain_on_ccie@yahoo.com)
Date: Fri Mar 28 2008 - 06:08:59 ART
Hi Matthew,
I labed it up and checked.
Cisco router does not remove any Private As number even if there is a single public AS in AS path. you can also not remove private as from a router if you are running private as number on that router.Otherwise next hop router would not know that this prefix falls in which AS since there is no as-path information attached to the prefix(mandatory attribute)
Private as number is removed when there is no public as number present in AS PATH list and list could have one or more element.
Thanks,
Mac
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Matthew Tang
Sent: Friday, March 28, 2008 12:47 PM
To: ccielab@groupstudy.com
Subject: Question about AS-Path
Gents,
I have one question about as-path, I want to remove some private AS from the as-path like this:
65001 123 456 65002 65003 (remove first one and keep 65002 and 65003)
I know juniper can remove the private from left to right and stops when it hits a public AS, not sure what the cisco solution is? Thanks
Matthew
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