From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sun Jul 25 2004 - 04:20:41 GMT-3
They are referring to EIGRP, OSPF, BGP, etc summary/aggregate routes
that automatically point to null.
Rack1R1#sho run | in (router ospf)|(summary)
router ospf 1
summary-address 172.16.0.0 255.255.0.0
Rack1R1#sho ip rout | in Null
O 172.16.0.0/16 is a summary, 00:00:44, Null0
Rack1R1#
Rack1R6#sho run | in (router bgp)|(aggregate)
router bgp 100
aggregate-address 96.0.0.0 224.0.0.0
Rack1R6#sho ip route | in Null
B 96.0.0.0/3 [200/0] via 0.0.0.0, 00:00:37, Null0
Rack1R6#
Rack1R3#sho run | in (interface Serial1/0.34)|(summary-address)
interface Serial1/0.34 point-to-point
ip summary-address eigrp 1 191.1.0.0 255.255.128.0 5
Rack1R3#sho ip route | in Null
D 191.1.0.0/17 is a summary, 00:01:49, Null0
Rack1R3#
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
Howard C. Berkowitz
Sent: Saturday, July 24, 2004 11:34 PM
To: group study
Subject: RE: Using ip route to null 0 to advertise local network to BGP
peer
At 12:56 AM -0400 7/25/04, Brian Dennis wrote:
>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,
Would you agree that "dynamic route to null" pretty much has to be a
static route to null redistributed into a dynamic routing protocol?
Offhand, I don't think any dynamic routing protocol has any inherent
knowledge of null, so the information really has to come from a
static route.
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