[c-nsp] BGP - hiding AS

[David Prall]

On R3 create an aggregate for the networks so they are advertised with only
the local as to R4. You can create two /25's for one /24 if you can't do a
larger aggregate.

David

--
http://dcp.dcptech.com
  

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Gary Roberton
> Sent: Thursday, April 03, 2008 11:46 AM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] BGP - hiding AS
> 
> Hello All
> 
> Well, my Provider does not support remove-private-as or 
> as-override.  So how
> can we do this now? Any ideas?
> 
> Gary
> 
> 
> On Wed, Mar 26, 2008 at 6:35 PM, Gary Roberton 
> <gary.ciscomail at gmail.com>
> wrote:
> 
> > 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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