From: Navin MS (navin_ms07@yahoo.com)
Date: Tue Jun 06 2006 - 14:41:48 ART
Hi Gregg,
The scenario is that AS 300 has peered with two other ASes, 65001 and 65002. Note that all the
three are independent Autonomous systems. AS 300 is aggregating all the routes from AS 65001 and
65002 and is sending to a Backbone service provider.
Therefore, AS 300 should remove these private ASes from the routes before sending it out to the
service provider and the catch is not to use the "remote-private-as" option.
I could match these private ASes using a regexp "_[64512-65535]_" (which means if the AS path
contains any private AS numbers), but then how do I filter that ?
IOS lets us either "append an AS" or "remote-private-as" when sending routes to the neighbor. But
there is no way to selectively remove some ASes from the AS path !! If there is a way to do this,
then this problem is solved.
Thanks.
Naveen.
--- gregg malcolm <greggmalcolm@yahoo.com> wrote:
> How about a BGP confederation?
>
> Gregg
>
> Godswill Oletu <oletu@inbox.lv> wrote: Naveen,
>
> Try the 'neighbor 1.1.1.1 local-as xxx no-prepend' command and see if it
> will work for you.
>
> Thanks.
> Godswill Oletu
>
> ----- Original Message -----
> From: "Navin MS"
> To:
> Sent: Friday, June 02, 2006 10:17 PM
> Subject: Filtering Private AS using Regexp ?
>
>
> > Hello Group,
> >
> > While trying to filter Private-AS numbers, we know we can use the neighbor
> > statement with
> > "remove-private-as" option.
> >
> > Is there an alternate way to do this, without using the above option ?
> >
> > I'm thinking of using a regexp to match private AS numbers... but wasn't
> > successful. Any idea ?
> >
> > TIA,
> > Naveen.
> >
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