From: Reisner, Tim (TR126568@exchange.DAYTONOH.NCR.com)
Date: Fri Sep 27 2002 - 16:18:27 GMT-3
This recently was a thread on the list, regarding Null0 routes.
For OSPF area x range and summary use:
Under "router ospf x"
no discard-route internal for "area x range" Null0s
and
no discard-route external for "summary-address" Null0s
Also see the following link:
http://www.cisco.com/warp/public/104/3.html
See the archives for all messages concerning this.
Tim
-----Original Message-----
From: Donny MATEO [mailto:donny.mateo@sg.ca-indosuez.com]
Sent: Monday, September 23, 2002 9:27 PM
To: ccielab@groupstudy.com
Subject: RE: summary to null 0 allowed?
Hi Brian,
in that case what is the use of summarization in dynamic routing protocol ?
Are we suppose to create
a tunnel/secondary address for every subnet which is not the same as your
classfull routing protocol
?
Or having said it, they don't care as long as we get rid of the null0 route
using the following
1. No discard-route internal for OSPF internal route only
2. Use distribute-list for any other else
Distribute-list 1 in Null0
access1 permit any
Or strictly no summarization unless told and deal with discontiguous subnets
with the following
1. If you wanna take risk of creating another subnet and another interface,
use tunnel.
2. Use secondary addressing
3. create a dummy routing process in case of OSPF
Donny
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