From: Joe Martin (jmartin@xxxxxxx)
Date: Thu May 04 2000 - 01:02:14 GMT-3
I've always seen OSPF demand circuit function, but its easy to think its
not. When doing redistribution, you must carefully prevent routes from OSPF
from being leaked back into OSPF. When this leakage occurs, LSAs are
generated causing the circuit to dial up. To test this, stop redistribution
from the OTHER routing protocols into OSPF and see what happens.
Hope it helps,
JOE
----- Original Message -----
From: "Kinton Connelly" <kinton@oldmedia.com>
To: "Fred" <fd200@bellatlantic.net>; <ccielab@groupstudy.com>
Sent: Wednesday, May 03, 2000 7:56 PM
Subject: Re: ccie bootcamp lab5b
> Fred, I've had a lot of problems getting ospf demand-circuit to work
> especially with CCIE Boot Camp's lab 8 with the way they have the ISDN
> interfaces in area 0. Even when I set up my configs to match theirs, the
> ISDN connection would never stay down.
>
> Here's what I saw with debugs: the ISDN connection (with demand-circuit)
> would come up because of ip traffic to 224.0.0.5 (ospf). The connection
> would time out at 120 seconds and the line would drop. But when the line
> dropped, OSPF would generate an LSA (don't know what kind) and that LSA
> would be flooded out the ISDN interface, bringing it up. This nasty circle
> would go on and on.
>
> What I did to get it to work was put the ISDN interfaces in their own area
> and make it a stub area. After that, demand-circuit worked as advertised.
>
> So maybe that's what they need to do - make sure the interfaces are in
> their own stub areas.
>
> Maybe someone on the list can better explain the exact mechanics of ospf
> demand-circuit - all I know is that without the stub area, the line goes
up
> and down forever - with the stub area, it works as advertised.
>
> Kinton
>
> At 5/3/00, you wrote:
> >Guys,
> >
> >For those who did the cciebootcamp lab5b, regarding the DDR in a
> >difference area other than the backbone. They claim they haven't figure
> >out what was the problem with it, so I am just wonder if any of you
> >figure that out already. Thanks
> >
> >Fred
> >
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