I have 2 routers (A and B) on a LAN, both connected with a third router (C) by an ISDN link. Between A and C a serial link is also present.
I configured OSPF demand circuit feature, giving different costs to the ISDN link A-C (100) and B-C (50).
I saw if the serial link goes down C try to bring up the ISDN link with B (it has a lower cost), but if for some reason it can't establish the connection, C isn't so smart to erase B from OSPF neighbors, stop calling B and proceed calling A.
Have I to give the "dialer wait-for-carrier-time" command?
Thanks to all.