From: Andy Hogard (andyhogard@gmail.com)
Date: Thu Dec 18 2008 - 16:15:15 ARST
Yep, the best would be to put it to test on a lab. Will do that in the
morning ya. Its night here, actually I came up with the solutions using your
ideas and how you explained in the one of the vods ya.
Will update you and the list in sometime, actually I am itching already. So
let me build a quick scenario ..and lets see how all three do.
Regards,
Andy.
On Thu, Dec 18, 2008 at 11:40 PM, Scott Morris <
smorris@internetworkexpert.com> wrote:
> Since you are specifically looking for things inside a confederation, the
> "(" and ")" are the parts we care about.
>
> My only concern about the first one you lise is that you are looking for 0
> or 1 (the ?) of ([0-9]*_) which would match none or one AS that must be
> inside ( ) for a confederation.
>
> The second one will definitely work with your example below as it's
> permitting any characters (numbers or spaces) as long as they are contained
> within the ( ) for a confederation.
>
> I don't have a confederation currently setup in my lab, so I can't
> specifically test out the first one, but when it came to the AS Path you
> listed below with multiple intra-confed ASNs listed, I would be curious as
> to whether it matched or not.
>
>
> Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
> CCSI/JNCI-M/JNCI-ER
> Senior CCIE Instructor
>
> smorris@internetworkexpert.com
>
>
>
> Knowledge is power.
> Power corrupts.
> Study hard and be Eeeeviiiil......
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Andy
> Hogard
> Sent: Thursday, December 18, 2008 2:07 AM
> To: Cisco certification
> Subject: Re: BGP regexp, doubt..?!
>
> Sorry one last final correction, ^\(([0-9]*_)?\)$ <==> ^(\(.+\))?$ . Yep
> are the two regexp the same ?! :)
>
> Might have looked like I was just losing my remaning hair over it.. lol.
>
>
> Greets!
>
> On Thu, Dec 18, 2008 at 12:18 PM, Andy Hogard <andyhogard@gmail.com>
> wrote:
>
> > Actually looks like I made a small typo, it should be is
> > ^(\([0-9]*_)?\)$ <==> ^(\(.+\))?$ ..!? :)
> >
> >
> > Regards,
> > Andy,
> >
> > PS: I will consider regexp done if I get this correct!! :D
> >
> > On Thu, Dec 18, 2008 at 12:13 PM, Andy Hogard <andyhogard@gmail.com
> >wrote:
> >
> >> Hi folks,
> >>
> >>
> >> I just wanted to know whether ^(\([0-9]*_\))?$ <==> ^(\(.+\))?$ ..?!
> >> Let me know what you think, my goal was to prevent a confederated AS
> >> from becoming a transit path, the reg exp that you see on your left
> >> is what I came up with and on the left that's a well know one from
> >> the IE blog. To me both seem to be the same,
> >>
> >> I will try and explain in brief here:
> >>
> >> (65535 64512 64513) thats how the as path would be like for the
> >> routes that originated within the AS. I need to match these and be
> >> able to export these out to the external AS ..whereas others which
> >> have (65535 64512 64513) 100 200 300 must be blocked.
> >>
> >> So [0-9] is my atom here, since I can have zero or multiple instances
> >> of these will use it with a *
> >>
> >> Hence arrive at [0-9]* , I need to match ( ) which is a special
> >> character so I will use "\", but before that a bracket operation for
> >> my atom. And obviously I will encose them within ^$, as thats what I
> need
> in my as path.
> >> My doubt here is that do I have to use [0-9]*_ as my atom or is just
> >> [0-9]* enough to match the blank spaces separating the two intra confed
> as nos. ya.
> >>
> >>
> >> Let your thoughts and comments flow
> >>
> >>
> >> Regards,
> >> Andy.
> >> --
> >> My Blog URL: http://ccieno.blogspot.com/
> >>
> >
> >
> >
> > --
> > My Blog URL: http://ccieno.blogspot.com/
> >
>
>
>
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