From: Geert Nijs (geert.nijs@simac.be)
Date: Mon Jul 12 2004 - 18:40:49 GMT-3
I think ^4_[0-9]*$
will not match routes originated in AS4
It will try to match the "_" character (i just tested in on
'route-server.ip.att.net' !! Nice Tip)
sh ip bgp reg-exp ^7018_[0-9]*$ will not match 7018 routes
Better is:
^7018(_[0-9]+)?$ : this optionally allows one extra AS
number after 7018
REgards,
Geert
and 'sh ip bgp reg <REGEX>'
-----Oorspronkelijk bericht-----
Van: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Namens James
Verzonden: maandag 12 juli 2004 4:43
Aan: Adel Abouchaev
CC: 'group study'
Onderwerp: Re: BGP Regular Expression - logic help
> I think it is ^(.+_)*4(_.+)?$
>
> because ^4_[0-9]*$ will not match 3 2 1 4, or 3 2 1 4 5. This will
> only
_4_[0-9]*$
>
> I think + is more appropriate here than *, since AS number must have
> at
> least one digit in it.
+ requires minimum object match
4_[0-9]+$ will match:
4 1 IGP
4 3 IGP
4 101 IGP
etc.
and will not match:
4 IGP
a good way to test out your regex is:
telnet route-views.oregon-ix.net or route-server.ip.att.net
and 'sh ip bgp reg <REGEX>'
-J
>
> Cheers,
>
> Adel Abouchaev
> CCIE# 12037
> www.netmasterclass.net
>
>
>
> Joe Deleonardo wrote:
>
> >D'OH! Light just went on.
> >
> >The * refers to what's inside the [ ]
> >
> >I was thinking it meant something more like ([0-9]*)*
> >
> >Cool! Thanks! That helped a lot!
> >
> >Cheers,
> >
> >Joe
> >
> >
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> >Of James
> >Sent: Sunday, July 11, 2004 5:45 PM
> >To: Joe Deleonardo
> >Cc: 'group study'
> >Subject: Re: BGP Regular Expression - logic help
> >
> >
> >
> >>It seems like ^4_[0-9]?$ would be what we should use to get "Only
> >>Networks Originated from AS 4, and ASs Directly Attached to AS 4"
> >>No?
> >>
> >>
> >
> >I believe ^4_[0-9]*$ should do your needs..
> >
> >
> >
> >>So what do you guys think? Am I over thinking this? Yes ^4_[0-9]*$
> >>will
> >>
> >>
> >get
> >
> >
> >>you what you want but it seems like, you'll also get more then AS 4
> >>and
> >>
> >>
> >it's
> >
> >
> >>directly attached networks.
> >>
> >>
> >
> >Hmm..? This seems to do it just fine. _[0-9]* means either match one
> >more asn after 4, or match nothing after 4. I know it's a bit
> >confusing :)
> >
> >output of.. sh ip bgp reg _701_[0-9]*$
> >*> 6.1.0.0/16 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.2.0.0/22 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.3.0.0/18 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.4.0.0/16 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.5.0.0/19 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.8.0.0/20 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.9.0.0/20 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.10.0.0/15 63.239.36.245 1923 100 0 209 701
668 i
> >*> 6.14.0.0/15 63.239.36.245 1923 100 0 209 701
668 i
> >*> 12.0.17.0/24 63.239.36.245 1923 100 0 209 701
26990
> >i
> >*> 12.1.235.0/24 63.239.36.245 1923 100 0 209 701
15184
> >i
> >*> 12.3.54.0/24 63.239.36.245 1923 100 0 209 701
25938
> >i
> >*> 12.3.80.0/22 63.239.36.245 1923 100 0 209 701
10998
> >i
> >*> 12.3.217.0/24 63.239.36.245 1923 100 0 209 701
16666
> >i
> >etc etc etc...
> >
> >
> >
> >
> >>You know if I had the choice of Cisco improving on any one thing -
> >>this would be it. There's got to be an easier way to catch this
> >>mouse.
> >>
> >>
> >
> >JUNOS as-path matching is a heck of a lot easier..
> >
> >-J
> >
> >
> >
> >>Thanks in advance!
> >>
> >>Joe
> >>
> >>[GroupStudy removed an attachment of type application/ms-tnef which
> >>had a
> >>
> >>
> >name of winmail.dat]
> >
> >
> >>____________________________________________________________________
> >>___
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>
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> _
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-- James Jun TowardEX Technologies, Inc. Technical Lead Network Design, Consulting, IT Outsourcing james@towardex.com Boston-based Colocation & Bandwidth Services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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