From: ying chang (ying_c@xxxxxxxxxxx)
Date: Thu Mar 28 2002 - 23:30:19 GMT-3
Hi,
Can someone explain why sh ip bgp regexp ^701 ?[0-9]*$ pick up 7018? It
looks like sh ip bgp regexp ^701 [0-9]*$ is the only correct way to do it
after all.
Thanks,
Chang
route-views.oregon-ix.net>sh ip b regexp ^701_?[0-9]*$
BGP table version is 876196, local router ID is 198.32.162.100
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
*> 3.0.0.0 157.130.185.17 0 701 80 i
*> 3.18.135.0/24 192.205.31.33 0 7018 ?
* 157.130.185.17 0 701 7018 ?
* 4.0.0.0 157.130.185.17 0 701 1 i
* 6.0.0.0/20 157.130.185.17 0 701 3549 i
*> 9.2.0.0/16 157.130.185.17 0 701 i
*> 9.184.112.0/20 157.130.185.17 0 701 3786 i
*> 9.186.144.0/20 157.130.185.17 0 701 3786 i
*> 12.0.0.0 192.205.31.33 0 7018 i
* 157.130.185.17 0 701 7018 i
* 12.0.252.0/23 157.130.185.17 0 701 16927 i
*> 12.3.80.0/22 157.130.185.17 0 701 10998 i
*> 12.3.194.0/24 157.130.185.17 0 701 6347 i
*> 12.3.217.0/24 157.130.185.17 0 701 16666 i
* 12.4.125.0/24 157.130.185.17 0 701 1239 i
*> 12.4.126.0/23 157.130.185.17 0 701 17024 i
* 12.5.201.0/24 157.130.185.17 0 701 23060 i
*> 12.5.202.0/24 157.130.185.17 0 701 22474 i
--More--
route-views.oregon-ix.net>sh ip b regexp ^701 ?[0-9]*$
BGP table version is 876420, local router ID is 198.32.162.100
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
*> 3.0.0.0 157.130.185.17 0 701 80 i
*> 3.18.135.0/24 192.205.31.33 0 7018 ?
* 157.130.185.17 0 701 7018 ?
* 4.0.0.0 157.130.185.17 0 701 1 i
* 6.0.0.0/20 157.130.185.17 0 701 3549 i
*> 9.2.0.0/16 157.130.185.17 0 701 i
*> 9.184.112.0/20 157.130.185.17 0 701 3786 i
*> 9.186.144.0/20 157.130.185.17 0 701 3786 i
*> 12.0.0.0 192.205.31.33 0 7018 i
* 157.130.185.17 0 701 7018 i
* 12.0.252.0/23 157.130.185.17 0 701 16927 i
*> 12.3.80.0/22 157.130.185.17 0 701 10998 i
*> 12.3.194.0/24 157.130.185.17 0 701 6347 i
*> 12.3.217.0/24 157.130.185.17 0 701 16666 i
* 12.4.125.0/24 157.130.185.17 0 701 1239 i
*> 12.4.126.0/23 157.130.185.17 0 701 17024 i
* 12.5.201.0/24 157.130.185.17 0 701 23060 i
*> 12.5.202.0/24 157.130.185.17 0 701 22474 i
--More--
>From: "Bob Sinclair" <bsin@erols.com>
>Reply-To: "Bob Sinclair" <bsin@erols.com>
>To: "Tim O'Brien" <tobrien@cinci.rr.com>
>CC: <ccielab@groupstudy.com>
>Subject: Re: AS-path access-list
>Date: Thu, 28 Mar 2002 20:07:32 -0500
>
>Tim,
>
>As you suggested, I did a telnet to:
>ner-routes.bbnplanet.net
>
>and entered:
>
>ner-routes>sh ip b regexp ^701_[0-9]*$
>
>Works like a charm, and has the advantage of not having to remember Ctl-V
>in order to enter the "?"
>
>Thanks!
>
>PS: One might also try: http://the.groovy.org/BGP/
>for links to mirrors, telnet access.
>
>----- Original Message -----
>From: "Tim O'Brien" <tobrien@cinci.rr.com>
>To: "Bob Sinclair" <bsin@erols.com>
>Cc: <ccielab@groupstudy.com>
>Sent: Thursday, March 28, 2002 7:48 PM
>Subject: RE: AS-path access-list
>
>
> > You can test it at ner-routes.bbnplanet.net
> >
> > Tim
> > 9015
> >
> >
> > -----Original Message-----
> > From: Bob Sinclair [mailto:bsin@erols.com]
> > Sent: Thursday, March 28, 2002 7:43 PM
> > To: Tim O'Brien
> > Cc: ccielab@groupstudy.com
> > Subject: Re: AS-path access-list
> >
> >
> > Tim,
> >
> > Based on my reading or Halabi, the two statements seem equivalent:
> >
> > ip as-path access-list 4 permit ^200_[0-9]*$
> >
> > and
> >
> > ip as-path access-list 4 permit ^200 ?[0-9]*$
> >
> > The underscore can mean most anything, including end of string. So it
>would
> > match ^200$ to identify routes from the immediate neighbor.
> >
> > The underscore can also be a space, then [0-9]*$ should match any
>number
> > (including zero) of consecutive numerals. Looks to me like both would
>work.
> > The first example may be easier to remember, but I would want to test it
> > before betting $1,250 on it! I know Halabi's works.
> >
> > -Bob
> >
> >
> > ----- Original Message -----
> > From: "Tim O'Brien" <tobrien@cinci.rr.com>
> > To: "Bob Sinclair" <bsin@erols.com>; "Hongtu Wang"
><hwang1073@rogers.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Thursday, March 28, 2002 7:29 PM
> > Subject: RE: AS-path access-list
> >
> >
> > > I found this one on the Cisco site. What do you think?
> > >
> > > ip as-path access-list 4 permit ^200_[0-9]*$
> > >
> > > http://www.cisco.com/warp/public/459/41.shtml#2
> > >
> > > Tim
> > > 9015
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > > Bob Sinclair
> > > Sent: Thursday, March 28, 2002 6:37 PM
> > > To: Hongtu Wang
> > > Cc: ccielab@groupstudy.com
> > > Subject: Re: AS-path access-list
> > >
> > >
> > > Hongtu,
> > >
> > > I believe you will find that the following expression will work with
>the
> > > fewest number of statements to define "routes from AS 200 and its
> > > neighbors":
> > >
> > > ip as-path access-list 4 permit ^200 ?[0-9]*$
> > >
> > > It is discussed in detail in Halabi's book "Internet Routing
> > Architectures",
> > > on page 376. The meaning of regular expression characters is
>explained on
> > > page 187.
> > >
> > > -Bob
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Hongtu Wang" <hwang1073@rogers.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Monday, March 25, 2002 10:29 PM
> > > Subject: AS-path access-list
> > >
> > >
> > > > Hi,
> > > >
> > > > My topology is:
> > > >
> > > > R1(AS100)----R2(AS200)----AS50---AS250
> > > >
> > > > If I only want to accept routes come from AS200 and all AS directly
> > > connect to AS200 (AS50 in my topology), how to write as-path
>access-list
> > on
> > > R1?
> > > >
> > > > Thanks
> > > >
> > > > Hongtu Wang
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:57:25 GMT-3