Hi,
In my humble opinion, how about this one?
Let me suppose your provider's AS number is 1:
ip as-path access-list 4 permit ^1 [0-9]+$
ip as-path access-list 4 permit ^1$
You can also check threads "Help about BGP regular expression".
and "Internet Routing Architecture" pp. 370~378
On 6 Dec 2000 02:07:52 -0500, [EMAIL PROTECTED] (John Neiberger) wrote:
>I'm in a multihoming situation where, so far, one provider is telling me
>they can only send the full routing table without some special arrangements.
>This sounds like a load of bullhockey, but that's what they're saying. So,
>here's the question...
>
>I only want to receive from both ISPs their routes and their customer
>routes. Then, I'll have a default route to the better ISP with a backup
>default to the second ISP.
>
>Is there a way to filter out the routes I don't want using regular
>expressions? I couldn't figure out how to accept an ISP's routes plus their
>customer routes while not accepting everything else. One ISP tags those
>routes allowing me to filter by community attribute, but the other is
>playing dumb. (The dumb one is Sprint, and it seems they are being a pain
>just because they can.)
>
>It's late, my brain is toast, and I'm tired of thinking about it. Regular
>expressions give me a headeache, anyway. Any ideas on how to do this?
>
>Many thanks as always,
>John
>
>
>
>
>
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