Re: How do you show advertised BGP community information?

From: Joe Chang (changjoe@earthlink.net)
Date: Wed Feb 26 2003 - 19:44:44 GMT-3


Right, I forgot to add that my suggestion would not work for the
"rib-outs".

----- Original Message -----
From: "Peter van Oene" <pvo@usermail.com>
To: "Joe Chang" <changjoe@earthlink.net>; <ccielab@groupstudy.com>
Sent: Wednesday, February 26, 2003 7:42 PM
Subject: Re: How do you show advertised BGP community information?

> At 06:23 PM 2/26/2003 -0400, Joe Chang wrote:
> >Here's a possible alternative that I haven't tried yet ( I've got to buy
> >that home lab soon ):
> >
> >show ip bgp community-list community-list-number
>
> Only shows the local-rib. I have struggled with this lack of visibility
> into post processed rib-outs in Cisco before. Juniper shows it nicely
> (shameless plug)
>
> AS-path prepends and AS-paths of locally generated routes are also not
> shown (can make it tough to see AS-Paths in aggregate routes that you make
> in your own AS)
>
> >will list the bgp table routes that would match the community list. To
"see"
> >the community information of your routes, you would need to create a
> >separate community filter list for every possible community in your
network.
> >
> >ip community-list 10 permit no-export
> >ip community-list 20 permit no-advertise
> >ip comminuty-list 30 permit 5150
> >etc...
> >
> >show ip bgp community-list 10
> >show ip bgp community-list 20
> >etc...
> >
> >
> > ----- Original Message -----
> >From: "Peter van Oene" <pvo@usermail.com>
> >To: <ccielab@groupstudy.com>
> >Sent: Wednesday, February 26, 2003 4:53 PM
> >Subject: Re: How do you show advertised BGP community information?
> >
> >
> > > At 12:14 PM 2/26/2003 -0600, Hughes, Gordon wrote:
> > > >Is there any way to see what community information you are sending
from
> > > >your local bgp router to an EBGP peer without actually using the
"show
> > > >ip bgp community" command on that remote peer?
> > >
> > > As far as I know, Cisco only shows the pre processed rib-out with the
> >below
> > > command. In other words, you can see which prefixes are going out,
but
> >not
> > > how they look.
> > >
> > >
> > >
> > > >The "show ip bgp neighbor x.x.x.x advertised-routes" doesn't do the
> > > >trick. I have even tried debugging with the command "debug ip bgp
> > > >x.x.x.x updates". The debug data shows everything but the community
> > > >information.
> > > >
> > > >
> > > >
> > > >Gordon
> > > >
> > > >
> > > >
> > > >This communication is confidential and may be legally privileged. If
you
> >are
> > > >not the intended recipient, (i) please do not read or disclose to
others,
> >(ii)
> > > >please notify the sender by reply mail, and (iii) please delete this
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> > > >unlawful. Thank you for your cooperation.



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