From: chrisa (chris_atkins@blueyonder.co.uk)
Date: Fri Dec 20 2002 - 10:29:13 GMT-3
Depends what you are trying to do.
Here is a example.
neighbor x.x.x.x route-map foo in
route-map foo permit 10
match as-path 1
ip as-path access-list 1 deny _3_
ip as-path access-list 1 permit .*
This would deny anything with a AS 3 in the AS path and permits all others.
Another
neighbor x.x.x.x route-map foo in
route-map foo permit 1
match as-path 1
ip as-path access-list 1 permit ^50$
ip as-path access-list 1 deny .*
This would only allow AS 50.
Suggest play with in a lab very powerful tool but needs practice good
examples on routing TCP II and appendix B has a good tutorial.
----- Original Message -----
From: "Sage Vadi" <sagevadi@yahoo.co.uk>
To: <ccielab@groupstudy.com>
Sent: Friday, December 20, 2002 12:21 PM
Subject: IP AS-PATH ACL & Regular Expressions
> Hi all!
>
> Currently I have -
>
> ip as-path access-list 1 permit _3_
> ~
> route-map foo permit 10
> match as-path 1
> ~
> neighbor x.x.x.x route-map foo in
>
> Which does what it is meant to do - ensure that the AS
> path has got a 3 in it's list.
>
> Q) How do I do the OPPOSITE - DENY any routes that
> have a 3 in the AS-PATH ???
>
> Can you show me how to set the route-map (deny or
> permit) and how to set the as-path acl (deny or
> permit). I've tried various permutations with little
> success.
>
>
>
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