From: Tim Fletcher (groupstudy@fletchmail.net)
Date: Mon Jun 14 2004 - 16:50:13 GMT-3
\n only works in command line substitution, not in AS path matching (unfortunately).
-Tim Fletcher
At 12:03 PM 6/14/2004, Geert Nijs wrote:
>The regular expression to match AS 100 and any directly connected AS,
>including AS-path-prepending is:
>
> ^100(_100)*(_([0-9]+)(_\3)*)?$
>
>
>Regards,
>Geert
>
>-----Oorspronkelijk bericht-----
>Van: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Namens
>Alexander Arsenyev (GU/ETL)
>Verzonden: maandag 14 juni 2004 16:13
>Aan: ccielab@groupstudy.com
>Onderwerp: RE: AS PATH
>
>
>Actually (10)+ in Cisco regexp means 10 or 1010, not 10_10_10_... Please
>remember that AS number is 2 bytes long so there is no such thing as
>AS 101010.
>To match neighbor AS number with prepends and its direct customers (no
>prepends) use ^(AS#_)+[0-9]*$ I've tried to develop AS path regexp which
>matches neighbor AS with prepends and its direct customers with prepends
>but no luck so far. The trick is that this regexp should match only 2
>different AS numbers in AS Path while ([0-9]+_)* matches ANY number of
>different AS numbers in AS path because regexp are "greedy" (I think).
>
>HTH,
>Cheers
>Alex
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Scott Morris
>Sent: 12 June 2004 14:36
>To: 'Richard Dumoulin'; ccielab@groupstudy.com
>Subject: RE: AS PATH
>
>
>If you want to take into account the pre-pending of an ACL, you would
>associate the "+" character, which is "one or more of the preceding
>value". Don't forget to create a character class though with ().
>
>If you put 10+ by itself, that only treats the "0" as "one or more", so
>10, 100, 1000, 10000 would match.
>
>If you do (10)+ that will treat "10" as the thing to repeat. So whether
>my as-path has 10 or 10 10 10 10 10 doesn't matter.
>
>HTH,
>
>
>Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
>CISSP, JNCIP, et al. IPExpert CCIE Program Manager IPExpert Sr.
>Technical Instructor swm@emanon.com/smorris@ipexpert.net
>http://www.ipexpert.net
>
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Richard Dumoulin
>Sent: Saturday, June 12, 2004 9:19 AM
>To: 'ccielab@groupstudy.com'
>Subject: AS PATH
>
>Some time ago, someone posted a link where an example of as-path
>access-list which embraced a neighbor AS plus its directed customers was
>shown.
>This acl did take into account prepending from those AS's.
>
>If anyone conserves this post would he send it again please ? I 've
>searched the archives but in vane,
>
>Thanks
>
>--Richard
>
>
>
>
>
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