Re: Regular Expression ^$

Hello Prakash,

In the above statement, the expression ^$ represents empty AS_PATH and hence
only locally originated routes will be advertised. Since there is implicit
deny, all other routes will be denied. It will be used in a scenario where
we would want to avoid particular AS becoming a transit AS for BGP routing
updates coming from another AS.

Thanks,

Karthik.

On Fri, Aug 13, 2010 at 2:57 AM, Prakash Kalsaria <
kalsaria.prakash_at_gmail.com> wrote:

> Regular expression
>
> ^ ----Start of string
>
> $ -- End of String
>
> what will be matched if i as-path access-list 111 permit ^$
>
> every AS OR Any AS
>
>
>
> Regards;
> Prakash
> http://prakashkalsaria.wordpress.com
>
>
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Received on Fri Aug 13 2010 - 23:20:48 ART