RE: Using ip route to null 0 to advertise local network to BGP

From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sun Jul 25 2004 - 01:56:48 GMT-3


Joseph,
        Here is a quote from the CCIE team's Networker's Presentation
concerning the use of static routes:

<quote>
Unless a question says so, you are not permitted to use**:
Static routes (of any kind)
Default routes

**Dynamic routes to null are permitted
</quote>

Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joseph D. Phillips
Sent: Saturday, July 24, 2004 8:13 PM
To: group study
Subject: Using ip route to null 0 to advertise local network to BGP peer

I notice in a couple places, Karl Solie and Leah Lynch, in CCIE
Practical Studies II, use a static route to null 0 in order to make sure
that a local network advertises properly to a BGP peer.

Is this allowed on the exam?

For example, on page 805, there is an explicit advertisement of the
191.19.42.0/24 net within BGP, and just to be on the "safe" side, they
added: ip route 191.19.42.0 255.255.255.0 null0 253

I understand the need for a high administrative distance on the static
route, but is this kind of route allowed in the lab exam?

Is it one of those real world things we're not allowed to do on lab day?

----- Original message -----
From: "Felice Russell" <felicear@sbcglobal.net>
To: "'Joseph D. Phillips'" <josephdphillips@fastmail.us>
Date: Sat, 24 Jul 2004 17:47:23 -0700
Subject: RE: OSPF auto ref

How is it going for you today Joesph?
Felice



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