Re: BGP: striping private ASs

Hi Jack,

If I understood your question correctly it will be something of this sort:
2 Routers R1 & R2
R1 sends updates and R2 receives.
If R1 has updates containing private Ases then as you send them to R2 you
just need to remove those private As, so that R2 will only see public Ases.
The command neighbor R2 remove private-as does this perfectly.

What you are looking for is how to do this on R2's side (Receiving side).
One way I just thought of would be to use the aggregate address command
(don't aggregate) use the same subnet you recieve from R1 and modify the
attributes (using advertise-map) by removing the private AS from the
AS-Path.

I haven't tested this solution before btw.

From Cisco Documentation:
Using the* advertise-map *keyword selects specific routes that will be used
to build different components of the aggregate route, such as AS_SET or
community.

Best Regards,
On Tue, Dec 8, 2009 at 6:28 AM, Jack Router <pan.router_at_gmail.com> wrote:

> Can I strip private as numbers from incoming updates? I know that I can
> strip private ASs with command:
>
> R1(config-router)# neighbor R2 remove-private-as
>
> In this case R1 does the job by stripping private ASs from updates sent to
> R2. Can I strip private-as on R2 instead ?
>
> Thanks,
>
>
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-- 
KJ
Blogs and organic groups at http://www.ccie.net