From: Bob Sinclair (bsin@xxxxxxxxx)
Date: Thu Mar 28 2002 - 22:07:32 GMT-3
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 or
der 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 - 10:57:24 GMT-3