From: John Edom (jedom123@gmail.com)
Date: Mon Dec 22 2008 - 04:47:14 ARST
Hi,
I think ^30_[0-9]*$ is correct. Please tell me if i am wrong.
Regards
On Sun, Dec 21, 2008 at 8:06 PM, Jason Madsen <madsen.jason@gmail.com>wrote:
> Hi John, your regular expression looks fine. It will match routes
> originated from AS 300 and its neighbor (AS 200). With the requirement you
> listed you could have also done ^300_(200)?$. I'm sure there are other
> ways to, but it's usually best to keep it simple. You can test your regular
> expressions by setting up your network and comparing your show output from "
> *show ip bgp regex xyz*" and "*show ip bgp*" where xyz represents your
> regex.
>
> Jason
>
> On Sun, Dec 21, 2008 at 8:42 AM, John Edom <jedom123@gmail.com> wrote:
>
>> Hi,
>>
>> if ebgp routers are connected like
>>
>> R1(as10)------------------R2
>> (as20)----------------------R3(as30)-----------------R4(as40)
>>
>> I want to configure as-path filtering on R4 so that it only accept
>> prefixes
>> that are originated from AS30 or from AS30's neighboring AS. I am
>> configuring
>>
>> ip as-p acc 10 per ^30_([0-9]+)?$
>>
>> is it right if not then please correct me
>>
>> Regards
>>
>>
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