Re: BGP REGEXP

It was exactly that :) this router server is cool though, I saw you mention
in an older post but being lazy I never gave it a go.

Thanks for your help!

On 25 June 2010 20:41, Tyson Scott <tscott_at_ipexpert.com> wrote:

> :). Sometimes it is like a light turns on. But yes your first point is
> correct.
>
>
>
> Regards,
>
>
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
>
> Managing Partner / Sr. Instructor - IPexpert, Inc.
>
> Mailto: tscott_at_ipexpert.com
>
>
>
>
>
> *From:* Muzammil Malick [mailto:malickmuz_at_gmail.com]
> *Sent:* Friday, June 25, 2010 3:32 PM
> *To:* Tyson Scott
> *Cc:* Cisco certification
> *Subject:* Re: BGP REGEXP
>
>
>
> Hi
>
> Yes I have read the posts you both mentioned already but its like you said
> I think I am overthinking it.
>
> I have tried testing this on the router servers and this is what I see
>
>
>
> sh ip bgp regexp ^[0-9]$
>
> I did not get a result from this and I expected this, because what i
> understand from this expression is that it will only match routes with 1
> single digit AS number.
>
> Am i right in thinking this?
>
>
>
> To prove this I used the following
>
> sh ip bgp regexp ^[0-9]+$
>
> This showed me all routes with a single AS number with any amount of
> digits.
>
>
>
> As long as I am right on my first point then I think I understand this now.
> I was having difficulty understand that the + operator could be used any
> number of times for any number (even though that's what it says on the tin)
>
>
>
> Thanks
>
>
>
>
>
> On 25 June 2010 19:50, Tyson Scott <tscott_at_ipexpert.com> wrote:
>
> 0-9 means any number between 0 and 9 occurring one or more times. Meaning
> any number in any combination.
>
> If you wanted specific numbers it would be something like
>
> [5|6][4|5]
>
> for example would only match
>
> 54, 55, 64, 65
>
>
> Regards,
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
> Managing Partner / Sr. Instructor - IPexpert, Inc.
> Mailto: tscott_at_ipexpert.com
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Muzammil Malick
> Sent: Friday, June 25, 2010 2:37 PM
> To: Cisco certification
> Subject: BGP REGEXP
>
> Hi Guys
>
> Can someone help me out here?
>
> I have always struggled with my understanding of regexp but I WANT to
> understand them desperately.
> I have to hang my head in shame because I have read a lot of posts out
> there
> but still keep getting confused.
>
> For example
>
> the "+" operator. As far as I can understand this means 1 or more
> instances.
> I have seen this used as follows:
>
> ^[0-9]+$ Directly connected AS.
>
> So I tested this using home made lab and sure enough it only shows routes
> from directly connected AS'
> When I look at this I interpret it as any number between 0-9, and this can
> be repeated one ore more times.
> e.g 1, 2, 3 or 22, 2222
> So how does this match 54, or 65?
>
> Thanks
>
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Received on Fri Jun 25 2010 - 20:44:32 ART