From: Dennis J. Hartmann (dhartma5@optonline.net)
Date: Fri Jun 24 2005 - 13:01:00 GMT-3
Here's some more information. Even if I remove the static route to
Null 0 from the two BGP border routers, the BRI stays up continuously
because a default route to 0.0.0.0 is being injected from another AS. If I
take all default routes out of the network, the network quiets down and the
BRI stays down.
It seems to me that if you have a default route, a BRI configured
with ip ospf demand-circuit doesn't matter and the BRI stays up
continuously. Any ideas?
Sincerely,
Dennis Hartmann
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dennis J. Hartmann
Sent: Friday, June 24, 2005 11:36 AM
To: 'GroupStudy'
Subject: Ip ospf demand-circuit : Default Route keeps BRI up/up
Let me frame the issue. I'm injecting a Null default route into BGP
with an ADMIN Distance of 250 so the unknown traffic will be thrown in the
bit bucket if the real default route injected by another AS goes down.
I'm using the ip ospf demand-circuit on my BRI which was working like a
charm until this Default routing in the BGP section of the lab. As soon as
I created a default route to Null 0 and started advertising the beast into
BGP, my debug ip routing show me a line which reads "RT: NET-RED 0.0.0.0/0
RT: NET-RED queued, Queue size 1 every 15 seconds or so. It's keeping my
ISDN link up.
Any ideas?
Sincerely,
Dennis J. Hartmann
White Pine Communications
CCSI#23402/CCIP/CCNP/CCDP/CCNA/CCDA
Cisco IP Voice Support & Design Specialist
Cisco Optical, VPN & IDS Specialist
MCSE
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