From: perez claude-vincent (claude_vincent@xxxxxxxxx)
Date: Thu Apr 05 2001 - 06:09:44 GMT-3
Thanks to you all,
--- "Connary, Julie Ann" <jconnary@cisco.com> wrote:
> an easier way to find the problem is to debug ospf
> flooding and/or lsa
> generation. Then you do not
> have to go through the pain of waiting for the link
> to be quiet for each
> interface as you bring it up.
>
> Julie Ann
>
> At 02:31 PM 3/27/2001 -0600, Alan Basinger wrote:
> >Your correct Z filter the bri subnet from
> redistribution into IGRP and your
> >LSA's should not continue to bring the link up.
> >
> >Alan
> >
> >-----Original Message-----
> >From: Mask Of Zorro [mailto:ciscokid00@hotmail.com]
> >Sent: Tuesday, March 27, 2001 2:32 PM
> >To: GeorgeZhang@alliant-energy.com;
> dbjohnson@adelphia.net;
> >jachandr@cisco.com; ywen@garcia.me.berkeley.edu;
> ccielab@groupstudy.com;
> >cisco@groupstudy.com; clarson@iloka.com;
> leah_lynch@lucent.com;
> >pjm@roadrunner.nf.net; abasinge@swbell.net;
> claude_vincent@yahoo.com;
> >netguy73@yahoo.com
> >Subject: Re: bri flapping with demand cirquit/igrp
> redistribution
> >
> >
> >Redistribution brings it up.
> >
> >What happens is, the link is brought up and OSPF
> forms an adjacency. Then,
> >since it is a demand circuit, periodic LSA's are
> squelched and OSPF routes
> >associated with those LSA's do not age out of the
> routing table. Then, the
> >layer 2 portion of the link drops, since there is
> no interesting traffic.
> >
> >Once the link drops, whatever protocol you are
> redistributing into OSPF sees
> >it's link drop, and changes its tables in
> accordance with the topology
> >change. This change gets redistributed into OSPF,
> and OSPF floods LSA's out
> >announcing the change. These LSA's bring up the
> link while OSPF converges.
> >Then, after a while, things are stable again, and
> the link drops - and guess
> >what? That's right! The whole thing starts
> again...
> >
> >There are ways to stop it.
> >
> >Z
> > >From: "George Zhang"
> <GeorgeZhang@alliant-energy.com>
> > >Reply-To: "George Zhang"
> <GeorgeZhang@alliant-energy.com>
> > >To: <dbjohnson@adelphia.net>,
> <jachandr@cisco.com>,
> > ><ywen@garcia.me.berkeley.edu>,
> <ccielab@groupstudy.com>,
> > ><cisco@groupstudy.com>, <clarson@iloka.com>,
> <leah_lynch@lucent.com>,
> > > <pjm@roadrunner.nf.net>, <abasinge@swbell.net>,
> > ><claude_vincent@yahoo.com>, <netguy73@yahoo.com>
> > >Subject: Re: bri flapping with demand
> cirquit/igrp redistribution
> > >Date: Tue, 27 Mar 2001 13:50:52 -0600
> > >
> > >I also had the same problem a few days ago. Here
> is how I fixed it:
> > >
> > >1. Isolate the problem by shutting down all
> other interfaces besides the
> > >interfaces
> > > between the two related routers;
> > >
> > >2. Disable all other routing protocols (non-OSPF
> ones);
> > >
> > >3. Turn off IGRP redistribution to OSPF;
> > >
> > >3. Now, verify the ISDN demand circuit. It
> should be quiet now.
> > >
> > >4. Now, start unshut the interfaces you have shut
> down one by one and
> > >verify
> > > that the ISDN demand circuit. It should
> might come up briefly but it
> > >should go
> > > down and keep quiet after some interfaces
> are unshut. If the ISDN
> > >line
> > > keep dialing, you should know which interface
> is causing the problem.
> > >
> > >5. If the ISDN line is still quiet after you
> unshut all interfaces, turn on
> > >your other router
> > > protocols such as IGRN, RIP, etc one by one.
> Again, verify the IDN
> > >line after
> > > each change as above.
> > >
> > >5. If the ISDN line is still quiet after you
> enable all other routing
> > >protocols, turn on your
> > > redistribution one by one. Again verify ISDN
> line along the way.
> > >
> > >If you follow these steps, you should be able to
> pin down what is causing
> > >your ISDN
> > >line to stay up.
> > >
> > >Hope it helps.
> > >
> > >George Zhang
> > >
> > >
> > > >>> "Donald B Johnson Jr"
> <dbjohnson@adelphia.net> 03/27/01 03:33PM >>>
> > >It may keep the connection open though even after
> there is no intresting
> > >traffic.
> > >Don
> > >----- Original Message -----
> > >From: Alan Basinger <abasinge@swbell.net>
> > >To: Chris Larson <clarson@iloka.com>; perez
> claude-vincent
> > ><claude_vincent@yahoo.com>; Ya Wen
> <ywen@garcia.me.berkeley.edu>; Patrick
> > >Murphy <pjm@roadrunner.nf.net>; Leah Lynch
> <leah_lynch@lucent.com>; 'Jay
> > >Chandradas' <jachandr@cisco.com>; 'Bob Boone'
> <netguy73@yahoo.com>;
> > ><cisco@groupstudy.com>; <ccielab@groupstudy.com>
> > >Sent: Saturday, March 24, 2001 8:37 AM
> > >Subject: RE: bri flapping with demand
> cirquit/igrp redistribution
> > >
> > >
> > > > CDP may work at layer 2 but if the line is
> brought up because of web
> > >traffic
> > > > CDP packets would then traverse the line
> consume a small amount of
> > > > bandwidth.
> > > > I have installed a few ISDN DDR VPN's without
> turning off CDP and never
> > >had
> > > > and issue but also didn't think about the
> bandwidth consumption at the
> > >time.
> > > >
> > > > Alan
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> > > > Chris Larson
> > > > Sent: Saturday, March 24, 2001 9:00 AM
> > > > To: perez claude-vincent; Ya Wen; Patrick
> Murphy; Leah Lynch; 'Jay
> > > > Chandradas'; 'Bob Boone';
> cisco@groupstudy.com; ccielab@groupstudy.com
> > > > Subject: RE: bri flapping with demand
> cirquit/igrp redistribution
> > > >
> > > >
> > > > It may not, I have just always disabled it on
> dialer links as a habit.
> > >It
> > > > makes sense that it shouldn't since the
> dialer-list defines layer 3
> > >traffic
> > > > only. You could always put an access-list on
> the dialer interface
> > >permitting
> > > > all traffic with the log statement to see
> exactly what is trying to get
> > > > accross the line. It will output to the
> console if you are consoled in.
> > >That
> > > > may help you to see what is bringing the line
> up.
> > > >
> > > > -----Original Message-----
> > > > From: perez claude-vincent
> [mailto:claude_vincent@yahoo.com]
> > > > Sent: Saturday, March 24, 2001 9:22 AM
> > > > To: Ya Wen; Patrick Murphy; Leah Lynch; 'Jay
> Chandradas'; 'Chris
> > > > Larson'; 'Bob Boone'; cisco@groupstudy.com;
> ccielab@groupstudy.com
>
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