From: Nick Griffin (ngriffin@sio.midco.net)
Date: Sat May 13 2006 - 20:55:01 ART
Have you tried _100$ to match routes originated in AS100
firstname jim wrote:
> Hi guys,
>
> A Lab prompted this question: suppose I have a confederation and 2 sub-as,
>
> {other as's} --- [ (as100) - (as101 R1)]AS1 ---- [as2(R2)]
>
> In short, subnet
> 1.0.0.0/24 from as100
> 1.0.1.0/24 from asl101
> some other subnets too,
>
> How do I make sure that R2 in as2 only get routes originated from AS1?
> The requirement is to only do filter on R1.
> I am looking for some as-path regular expression help, so far I have tried
> (on R1):
>
> ip as-path 11 permit ^$
> ip as-path 11 permit (100) ! this works, but I think it includes more
> un-wanted routes
>
> These are the different ways I tried, they don't work. A better idea
> anyone?
> ip as-path 11 permit ^100$
> ip as-path 11 permit ^(100)$
> ip as-path 11 permit _(100)$
>
> TIA
>
> --
> Jim Li
> 614-376-2865
>
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