A multilink group having only one serial line as amember is configured on RouterA and similar on RouterB. Both routers hace PRI lines as backup having loopback address. OSPF is running on these multilink interfaces and it forms neighbor relationship with each other. So far it seems ok. As a backup to this multilink interface ( serial interface ) can one of the channel from PRI be configured to dial other router and also form a neighbor relationship.
Fro example :
RouterA and RouterB are neighbors on multilink interface. and using their loopbackl address. If serial link fails can RouterA diales to RouterB on PRI line and forms the neighbor relationship. Loopback address is already published in ospf process.
Thanks in advance
Any link on Cisco.com