From: Kaiser Anwar (kaiseranwar@sbcglobal.net)
Date: Thu Sep 25 2003 - 19:13:13 GMT-3
This is another of my concern that if not told in the lab do we redistribute
lab routes to bb so it has a path back.
this way when you do pinging you could be sure that not only you see bb
routes that you also have a best path.
this way you can ping end to end.so what is it you just to what you are told
and make sure that it works.
Thanks In advance for reply
Kaiser Anwar
----- Original Message -----
From: "William Lijewski" <ccie8642@hotmail.com>
To: <kaiseranwar@sbcglobal.net>; <ccielab@groupstudy.com>
Sent: Thursday, September 25, 2003 5:02 PM
Subject: Re: routes to backbones
> If you want to block routes, you don't want to apply an access-list to an
> interface. The access-list on the interface will block traffic, not
routing
> updates. You would want to use the distribute-list outbound to the
backbone
> router. For RIP and EIGRP it would always be a distribute-list, and you
> should always be specific as to which interface you are blocking the
routing
> updates:
>
> distribute-list 1 out ethernet 0
>
> If you are blocking BGP routes there are a couple of ways you can do it:
> distribute-list, prefix-list, or filter-list depending on the
requirements.
> Again all of these should be a specific as possible with their
application -
> they should all go on neighbor statements.
>
> You router that is directly attached to the Backbone router will still be
> able to ping it since its ping by default will be sourced from its
outgoing
> (connected to the Backbone) interface. The Backbone router will know how
to
> get back to it. Unless there is a default route on the Backbone router no
> other router would be able to ping it since the Backbone router wouldn't
> have a return path (the directly connected router would not be able to
ping
> it either if you changed the source address of the ping).
>
> Bill Lijewski
> CCIE #8642
> Network Learning Inc
> 5 Day R&S CCIE Bootcamp Instructor
>
>
> >From: "Kaiser Anwar" <kaiseranwar@sbcglobal.net>
> >Reply-To: "Kaiser Anwar" <kaiseranwar@sbcglobal.net>
> >To: <ccielab@groupstudy.com>
> >Subject: routes to backbones
> >Date: Thu, 25 Sep 2003 16:48:41 -0500
> >
> >Hi,
> > just came up with this, if I am told that I am not supposed to send
> >any
> >routes to backbone.
> > what would be the best way to accomplish this.create an standard
> >access
> >list and apply to the bb interface or
> > match it with distribute list and apply it in the routing process for
> >rip
> >or for bgp on neighbor. just little confused.
> > in either of the case if an access list is applied. would I still be
> >able to
> >ping BB routes. or may there is a proper way to do it.
> >
> >
> >Thanks
> >Kaiser Anwar
> >
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