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Multiple Interfaces to a Link
Each of the multiple interfaces are assigned different Interface IDs, used to detect MIL.
If an interface has multiple instance IDs, it will be grouped with other interfaces based on matching instance Ids.
Disable sending and receiving of OSPF packets on all but one of the interfaces to the link, except to receive self originated hellos
Interface which continues to send and receive OSPF packets called the Active Interface
Interfaces which do not send and receive OSPF packets called Standby Interfaces
PPT Version