Problem in BGP wrong AS number: %BGP-3-NOTIFICATION

From: Anderson Mota Alves (mota_anderson@hotmail.com)
Date: Fri Jul 14 2006 - 10:22:22 ART


Hi everyone, I'm having the following problem in my lab where I have R1
connected to R4 via ethernet and my configurations in bgp seems to be
fine except for the neighbor x.x.x.x remote-as that has been configured
with a dummy AS number with the only purpose of checking the use of the
commandneighbor x.x.x.x local-as XX no-prepend (where I can pretend to be
another AS on R1 if for any reason the R4 has this configured with a
wrong AS and I can't change that on R4) with the no-prepend to not
prepend the AS number in the routes which is turned on by default. The
question I've been asking myself is what happens if the R4 was a service
provider's router and the service provider had configured your neighbor
with your AS number with a wrong number, is there any way that I can get
through debugs or commands on R1 to know what was the wrong AS put on R4
by the service provider so I can configure the local-as feature of BGP on
R1?? Any comments are really appreciated, Thanks, Andy



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