From: Peter van Oene (pvo@usermail.com)
Date: Sun Mar 23 2003 - 12:44:02 GMT-3
At 02:24 PM 3/23/2003 +0800, Fan Shan wrote:
>If local AS is in the AS-PATH, that means traffic in local AS transit
>other AS and come back, will it be automatically removed ?
>If not, I have to configure As-path filter to do that?
AS-PATH loop detection deals with routing updates (ie control), not actual
packet forwarding. Because of this, routers only look at at AS-PATHs on
incoming BGP update messages when they decide whether or not the update is
valid. Those paths that contain the local-as are by default ignored by
the receiving AS due to the likelihood that the path contains a logical loop.
Pete
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