From: Rick Burts (burts@xxxxxxxxxxxxxx)
Date: Tue Oct 23 2001 - 10:18:47 GMT-3
Russell
In my experience the majority of the time that OSPF demand circuit does
not function correctly is because of LSAs (mostly as a result of
redistribution). If you are quite certain that it is a hello (message
type 1) rather than LSA (message type 4) the next thing I would look at
would be the code level of all of the routers in the OSPF area (not
just the two doing demand circuit). All the routers must support the
do not age function. If any router is running code that does not support
do not age then demand circuit will not work.
Testing backup interface can be a bit tricky. Most especially if you test
by shutting down the primary interface the IOS will not bring the ISDN out
of standby mode. generally it works to cause a failure by unplugging the
cable. If you have defined subinterfaces shutting down the physical
interface will usually bring up the backup. If you are using physical
interface shutting down the interface of the frame switch will usually
work as will removing the clock rate or the keepalive function.
Rick
Rick Burts, CCSI CCIE 4615 burts@mentortech.com
Mentor Technologies 240-568-6500 ext 6652
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On Tue, 23 Oct 2001, Fear, Russell H wrote:
> Can anyone in the group clarify something for me please. When I use ip ospf
> demand-circuit on a dialer interface, 7 out of 10 times it works fine with
> hellos being supressed, the rest of the time it brings up the line
> continually for hellos. I have debugged in these cases and it is not an lsa
> but a hello bringing it up. I realise I can stop this with an access list
> but is the command badly bugged or is there something I'm missing ?
>
> Also if anyone has done ccbootcamp lab 20, how do you get the ISDN to
> back-up a dlci ? I see in the solution that they have just placed the
> interface in back-up mode but this doesn't seem to work when I down the
> interface.
>
> Any help would be appreciated.
>
> TIA
>
> Russell
>
>
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>
>
>
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