From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Fri Jun 24 2005 - 15:40:33 GMT-3
I'm pretty sure it is possible to have a default route in the network
and not have the demand circuit keep the line up.
Take a look at http://www.cisco.com/warp/public/104/dcprob.pdf which
lists the main causes for this happening and solutions.
I'd start with show dialer to see the dial reason and track it down from
there.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dennis J. Hartmann
Sent: Friday, June 24, 2005 11:01 AM
To: 'GroupStudy'
Subject: RE: Ip ospf demand-circuit : Default Route keeps BRI up/up
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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