From: John Matus (jmatus@pacbell.net)
Date: Wed Oct 20 2004 - 01:36:55 GMT-3
brian,,,,,i created a filter-list with the as-path of
^5(_[0-9]+)?$........cleared bgp adj's and then checked the bgp table and
the second hop away disappeared and only prefixes from AS 5 remained.
Regards,
John D. Matus
MCSE, CCNP
Office: 818-782-2061
Cell: 818-430-8372
jmatus@pacbell.net
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: "John Matus" <jmatus@pacbell.net>; "Peter Ding" <pding@cisco.com>;
"James" <james@towardex.com>
Cc: "lab" <ccielab@groupstudy.com>
Sent: Tuesday, October 12, 2004 9:25 AM
Subject: RE: regex question for bgp
John,
How did you test it? See the below output from a route-server:
route-server-ap.cwidc>sh ip bgp reg ^4694(_[0-9]+)?$
BGP table version is 87748242, local router ID is 64.56.160.18
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i0.0.0.0 64.56.160.10 1000 0 4694 i
* i 64.56.160.11 1000 0 4694 i
* i4.0.0.0 64.56.160.11 1000 0 4694 3356 i
* i 64.56.160.10 1000 0 4694 3356 i
*>i 64.56.160.5 1000 0 4694 3356 i
* i 64.56.160.5 1000 0 4694 3356 i
* i8.0.0.0 64.56.160.10 1000 0 4694 3356 i
* i 64.56.160.11 1000 0 4694 3356 i
*>i 64.56.160.5 1000 0 4694 3356 i
* i 64.56.160.5 1000 0 4694 3356 i
* i15.208.32.0/20 64.56.160.5 1000 0 4694 151 i
*>i 64.56.160.5 1000 0 4694 151 i
* i 64.56.160.10 1000 0 4694 151 i
* i 64.56.160.11 1000 0 4694 151 i
* i15.211.160.0/20 64.56.160.5 1000 0 4694 151 i
* i 64.56.160.11 1000 0 4694 151 i
* i 64.56.160.10 1000 0 4694 151 i
*>i 64.56.160.5 1000 0 4694 151 i
--More--
That matches it's connected AS of 4694 plus one more AS in the path.
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> John Matus
> Sent: Monday, October 18, 2004 10:19 PM
> To: Peter Ding; 'James'
> Cc: 'lab'
> Subject: Re: regex question for bgp
>
> i had tried ^5(_[0-9]+)?$ but that did not work <stollen from
> internetworkexperts labs>
>
>
> Regards,
>
> John D. Matus
> MCSE, CCNP
> Office: 818-782-2061
> Cell: 818-430-8372
> jmatus@pacbell.net
> ----- Original Message -----
> From: "Peter Ding" <pding@cisco.com>
> To: "'James'" <james@towardex.com>; "'John Matus'"
<jmatus@pacbell.net>
> Cc: "'lab'" <ccielab@groupstudy.com>
> Sent: Monday, October 11, 2004 8:09 PM
> Subject: RE: regex question for bgp
>
>
> > How about this one?
> >
> > ^5(_[0-9]+)?$
> >
> > PD
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> > James
> > Sent: Monday, October 11, 2004 7:49 PM
> > To: John Matus
> > Cc: lab
> > Subject: Re: regex question for bgp
> >
> >
> > On Mon, Oct 11, 2004 at 07:34:15PM -0700, John Matus wrote:
> >> how would you solve the following requirement?
> >>
> >> R1 is in AS 1 and are connected to a bb router in AS 5. you want
to
> >> implement a filtering policy on R1 to only accept routes that come
> >> from either AS 5 or an AS connected directly to AS 5. so AS 5 can
be
> >> in the as path as well as one more AS. how would you create a
regex
> >> to satisfy this requirement? i'm pretty stumped <not a regex pro>
> >
> > ^5_[0-9]*$
> >
> > HTH,
> > -J
> >
> >
> > --
> > 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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