[j-nsp] AS-path regexp clue needed

[KJ]

Take a look here:

http://www.juniper.net/techpubs/software/junos/junos74/swconfig74-policy/html/policy-extend-match-config3.html
<http://www.juniper.net/techpubs/software/junos/junos74/swconfig74-policy/html/policy-extend-match-config3.html>

On 29 July 2010 14:18, Daniel Verlouw <daniel at bit.nl> wrote:

> Hi,
>
> can someone give me some clue on how to translate the following Cisco
> regexp to Junos ?
>
> ip as-path access-list 1 permit ^([0-9]+)(_\1)*$
>
> (this uses pattern recall to match AS paths whose first AS number in the
> path is repeated zero or more times; basically to make sure certain
> customers prepend their own AS number only).
>
> IOS-to-Junos translator is unable to parse this and JTAC, well, let's
> just say they don't seem to get it -at all-.
>
> Of course, I could write a regexp per customer, but obviously this
> doesn't scale very well.
>
>  --Daniel.
>
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-- 
//kjwilki