From: nayyar hakeem-habeeb (nyrhh@hotmail.co.uk)
Date: Thu Mar 12 2009 - 22:15:57 ARST
Larry,
Not quite clear on that :-( - in this scenario, the route to Null0 was entered
manually, no manual summarization is taking place and auto-summary is off.
That is, adding a 0.0.0.0/0 to null0 + using "network 0.0.0.0" originates
0.0.0.0/0 into AS 200.
..... not clear on how this comes about.
Thanks.
Date: Thu, 12 Mar 2009 20:00:34 -0400
Subject: Re: EIGRP Default Route /w ip route 0.0.0.0/0 null0 + network
0.0.0.0????
From: lhadrava@ipexpert.com
To: nyrhh@hotmail.co.uk
CC: ccielab@groupstudy.com
Eigrp automatically creates a route to a null0 (the bit bucket) whenever a
summary address is configured
to prevent routing loops.
Here is a link that explains this behavior:
http://www.cisco.com/en/US/tech/tk364/technologies_tech_note09186a00801c9a6e.
shtml
Larry Hadrava
CCIE #12203 CCNP CCNA
Sr. Support Engineer IPexpert, Inc.
URL: http://www.IPexpert.com
On Thu, Mar 12, 2009 at 7:40 PM, nayyar hakeem-habeeb <nyrhh@hotmail.co.uk>
wrote:
Hi Experts,
why would EIGRP inject a 0.0.0.0/0 route with this configuration? I have
always been under the impression that the "network" statement (under EIGRP)
only enables interfaces for participation.
Is there any explanation for this?
EIGRP Default Route /w ip route 0.0.0.0/0 null0 + network 0.0.0.0
=============================
hostname AS200-1
!
interface FastEthernet0/2
description To Router AS200-5
ip address 10.1.3.1 255.255.255.0
!
router eigrp 200
network 0.0.0.0
no auto-summary
!
ip http server
no ip http secure-server
ip route 0.0.0.0 0.0.0.0 Null0
=============================
AS200-5#r | i _0\.0\.0\.0
Gateway of last resort is 10.1.3.1 to network 0.0.0.0
D* 0.0.0.0/0 [90/28160] via 10.1.3.1, 00:13:26, FastEthernet0/2
=============================
Many Thanks.
Blogs and organic groups at http://www.ccie.net
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