From: Bob Chahal (bob.chahal@xxxxxxxxxxxx)
Date: Sat Jun 02 2001 - 11:49:54 GMT-3
I just want to get this clear.
If you configure an ospf isdn demand circuit as a backup to a serial
interface, the LSA do not age so that's not problem. But why configure ISDN
as a demand circuit? Why not just configure it as part of the OSPF domain
and when the interface goes down the circuit will just come and form an
adjacency with the other end and synchronise it's ospf database etc etc.
Some practice lab solutions configure the ISDN with ip ospf network
demand-circuit and then configure backup int bri0 under the serial
interface. All interfaces on the isdn routers are configured as part of the
ospf domain but I think this works fine without the demand-circuit config.
Interesting traffic permits all ip and the only other thing is that only one
end of the isdn circuit actually initiates the call.
I think I'll lab all this out again but I'd be interested to hear what
people might think.
Thanks
Bob
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