[c-nsp] BGP - hiding AS

Gary Roberton gary.ciscomail at gmail.com
Wed Mar 26 13:35:14 EDT 2008


I have the following topology

Router 1(AS65501) -> Router 2 (AS123) -> Router 3 (AS456) -> Router4
(AS65504)

Router 1 is my site (private AS)
R2 is network provider (public AS - I cant change config)
R3 is my other site (public AS)
R4 is end customer (private AS)

Router 1 advertises network 10.1.1.1 to R2, then R2 to R3, R3 to R4.

Problem is that I need to suppres / hide / remove the private AS of R1 by
the time it gets to R4.  This is because R4 can see the same private AS in
use elsewhere on its own network.

I would use the *neighbor x.x.x.x remove-private-as ***command but
understand that this doesn't work if you have public and private AS numbers
in the path.

What is best practice?

Thanks in advance

Gary
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