From: IPSec (ipsec@xxxxxxxxxxxxx)
Date: Fri Feb 15 2002 - 04:57:38 GMT-3
yes, I agree. that as_path would include more than asked for, like Sean pointed
out.
Thank you Brian for clarifying for me.
-----Original Message-----
From: Brian Dennis <brian@5g.net>
To: IPSec <ipsec@myrealbox.com>
Date: Thu, 14 Feb 2002 23:51:20 -0800
Subject: Re: Re: Halabi's AS_PATH
The way it's written it'll include more than AS 1. I think that it would be
better written as ^1_[0-9]*$. This way you won't get everything that starts
with ^1 (i.e. 11, 100, etc)
Brian Dennis, CCIE #2210 (R&S)(ISP/Dial)
On Thursday 14 February 2002 11:18 pm, IPSec wrote:
> Brian, thanks for the url!
> I logged on and played a few regexp's on it.
> My understanding of ? is 0 or 1 occurance of the preceding character, which
> in my question is a space. and * is 0 or multiple occurances, which in my
> question is a single digit of 0 to 9. And ^ and $ are beginning and end of
> the as-Path. I guess what I don't understand is Halabi used it to refer any
> AS's from neighbor AS1 and AS1's neighbor. How does that ^1 ?[0-9]*$
> as_path translate to that?
>
> IPSec
>
> -----Original Message-----
> From: Brian Dennis <brian@5g.net>
> To: IPSec <ipsec@myrealbox.com>, ccielab@groupstudy.com
> Date: Thu, 14 Feb 2002 22:32:23 -0800
> Subject: Re: Halabi's AS_PATH
>
> IPSec, (if that is your real name ;-)
>
> Telnet to this route server:
>
> ner-routes.bbnplanet.net
>
> and play around with these three commands:
>
> sho ip bgp regexp ^701$
> sho ip bgp regexp ^701 ?[0-9]*$
> sho ip bgp regexp ^701_
>
> You should quickly be able to find the answer to your question.
>
>
> Brian Dennis, CCIE #2210 (R&S)(ISP/Dial)
>
> On Thursday 14 February 2002 09:54 pm, IPSec wrote:
> > There's multiple references to an as_path of
> > ^1 ?[0-9]*$ in Halabi's Chapter 12.
> > Could someone explain to me what that as_path means?
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