I would do it without using the backup interface feature. Use floating statics:
ip route (corportate address) serial0
ip route (corportate address) serial1
ip route (ip address of corporate dialer interface) 255.255.255.255 dialer1
ip route (corportate address) (ip address of corporate dialer interface) 200
As long as either serial line is up, no traffic will be sent to the dialer interace.
If you are using a routing protocol, skip the first two static routes and make sure that the static to the corporate network via the dialer interface has a higher administrative distance than that of your routing protocol.
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When moving from OSPFv2 to OSPFv3, there are many changes in the format of the LSAs Type, but the most known changes are: IP prefix informations are no longer carried in Type-1 LSA and Type-2 LSA, new LSAs Type 8 and 9 are added to carry these prefixes.
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Question 1: What are the OSPF Loop Prevention Mechanisms
In single area, the routers have the Link State Database, having the same LSDB helps the routers to build a loop-free topology.
Now in a multiarea topology, the ABRs are respon...