From: Fabio Rodrigues (fleandror2@gmail.com)
Date: Tue Sep 12 2006 - 16:24:30 ART
Hi All,
tks for the answers. In fact I know what means each character that can be used
in the regular expressions. I also already tested the both regular expressions
in Loooking Glass Routers (http://traceroute.org/) and in my lab (as the
attach). But the a regular expression is like a program, that has a logic. In
my opinion, the both "logics" are different, but reaches the same result. What
I need to know is if anyone share the same opinion that my or not (and say me
for what reason don't agree).
Tks again,
Fabio.
----- Original Message -----
From: Fabio Rodrigues
To: ccielab@groupstudy.com
Sent: Tuesday, September 12, 2006 2:09 PM
Subject: Re: Regular Expressions
All,
sorry for the insistence, but look the output below (use notepad ou courier
font):
R2#term len 0
R2#sh ip bgp
BGP table version is 171, local router ID is 150.1.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i0.0.0.0 129.1.17.7 0 200 0 100 i
* 129.1.124.4 0 0 100 i
* i28.119.16.0/24 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i28.119.17.0/24 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
*>i112.0.0.0 129.1.13.1 0 100 0 100 54 50 60 i
*>i113.0.0.0 129.1.13.1 0 100 0 100 54 50 60 i
* i114.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i115.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i116.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i117.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i118.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i119.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i129.1.3.0/25 129.1.13.1 2588160 100 0 i
*> 129.1.23.3 2588160 32768 i
* i129.1.3.128/25 129.1.13.1 2588160 100 0 i
*> 129.1.23.3 2588160 32768 i
* i129.1.17.0/24 129.1.13.1 0 100 0 i
*> 129.1.23.3 5401600 32768 i
* i129.1.45.0/29 129.1.13.1 0 100 0 100 i
*> 129.1.124.4 0 0 100 i
* i129.1.46.0/24 129.1.13.1 0 100 0 100 i
*> 129.1.124.4 0 0 100 i
* i129.1.58.0/24 129.1.13.1 2 100 0 100 i
*> 129.1.124.4 2 0 100 i
*> 205.90.31.0 192.10.1.254 0 0 254 ?
*> 220.20.3.0 192.10.1.254 0 0 254 ?
*> 222.22.2.0 192.10.1.254 0 0 254 ?
R2#
R2#
R2#
R2#
R2#sh ip bgp regexp ^100_[0-9]*$
BGP table version is 171, local router ID is 150.1.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i0.0.0.0 129.1.17.7 0 200 0 100 i
* 129.1.124.4 0 0 100 i
* i28.119.16.0/24 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i28.119.17.0/24 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i114.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i115.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i116.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i117.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i118.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i119.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i129.1.45.0/29 129.1.13.1 0 100 0 100 i
*> 129.1.124.4 0 0 100 i
* i129.1.46.0/24 129.1.13.1 0 100 0 100 i
*> 129.1.124.4 0 0 100 i
* i129.1.58.0/24 129.1.13.1 2 100 0 100 i
*> 129.1.124.4 2 0 100 i
R2#
R2#
R2#
R2#
R2#
R2#sh ip bgp regexp ^100(_[0-9]+)?$
BGP table version is 171, local router ID is 150.1.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i0.0.0.0 129.1.17.7 0 200 0 100 i
* 129.1.124.4 0 0 100 i
* i28.119.16.0/24 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i28.119.17.0/24 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i114.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i115.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i116.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i117.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i118.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i119.0.0.0 129.1.13.1 0 100 0 100 54 i
*> 129.1.124.4 0 100 54 i
* i129.1.45.0/29 129.1.13.1 0 100 0 100 i
*> 129.1.124.4 0 0 100 i
* i129.1.46.0/24 129.1.13.1 0 100 0 100 i
*> 129.1.124.4 0 0 100 i
* i129.1.58.0/24 129.1.13.1 2 100 0 100 i
*> 129.1.124.4 2 0 100 i
R2#
This is the reason for my question. The output is the same.
Tks,
Fabio.
----- Original Message -----
From: "Peter Cresswell" <p-cresswell@iname.com>
To: "'Heiko Liedtke'" <heiko.liedtke@gmx.net>
Cc: "'Fabio Rodrigues'" <fleandror2@gmail.com>; <ccielab@groupstudy.com>
Sent: Tuesday, September 12, 2006 1:29 PM
Subject: RE: Regular Expressions
> Yeah I think that's what I meant, just without a real world example.
>
> expression 1 would be:
> Matches routes that have been learnt from AS 100 but could have
originated
> anywhere except AS 100 (unless route included pre-pending).
>
> Expression 2 would be:
> Matches routes that have been learnt from AS 100 and have originated from
an
> AS directly connected to AS 100 (e.g. AS YOU-----AS100------AS200), but
> not routes that are more than 2 as hops away (e.g. not match AS
> YOU----AS100----AS200---AS3000).
>
> I think that is a better explanation than my first attempt :-)
>
> Peter
>
> -----Original Message-----
> From: Heiko Liedtke [mailto:heiko.liedtke@gmx.net]
> Sent: 12 September 2006 17:19
> To: Peter Cresswell
> Cc: 'Fabio Rodrigues'; ccielab@groupstudy.com
> Subject: Re: Regular Expressions
>
> Sorry,
>
> but I think that bouth of you are wrong...
>
> First Expression
>
> ^100(_[ 0-9]+)?$
>
> This matches all paths coming from AS100 and have or have not originated
in
> another AS. This means, that the paths could have originated in AS100
>
> e.g.
> 100 999
> 100 1
> 100 546
> 100
>
> Second Expression
>
> ^100_[0-9]*$
>
> This matches all paths coming from AS100 and have originated in another
AS.
> This means, that the paths could not have originated in AS100
>
> e.g.
> 100 999
> 100 1
> 100 5456
>
> Regards
>
> Heiko
>
>
>
>
>
> Peter Cresswell schrieb:
>
>>Fabio,
>>
>>The difference is the bottom one will match multiple as's in an as path
>>becoase the _ is also allowed to be repeated. The 2nd one will only
>>match "100 " then a list of digits between 0-9 without any spaces.
>>
>>
>>E.g.
>>
>>Expression 1 would match:
>>100 200 300 111
>>
>>Expression 2 would match:
>>
>>100 200300111
>>
>>Regards,
>>
>>Peter
>>
>>-----Original Message-----
>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>>Fabio Rodrigues
>>Sent: 12 September 2006 16:12
>>To: ccielab@groupstudy.com
>>Subject: Regular Expressions
>>
>>Hi All,
>>
>>does anyone knows to say the difference of the effect (if exists) of
>>these two regular expressions?
>>
>>^100(_[ 0-9]+)?$
>>^100_[0-9]*$
>>
>>
>>Tks,
>>
>>
>>Fabio.
>>
>>_______________________________________________________________________
>>Subscription information may be found at:
>>http://www.groupstudy.com/list/CCIELab.html
>>
>>_______________________________________________________________________
>>Subscription information may be found at:
>>http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Oct 01 2006 - 16:55:40 ART