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6

A passive interface in OSPF does not send hello packets, so it will never form a neighbor relationship nor exchange routes with another OSPF router. By setting the passive interface default command, you make all OSPF interfaces passive. The router will lose all its neighbors and with them, routing information. It is often good practice to use the passive ...


5

By setting an interface to passive, you will never form a neighbor on that interface. Unless you use the no passive interface command on at least one interface, you will have no neighbors and get no routes from any other router. Basically, you could just disable OSPF and get the same result. If you have many interfaces where there will be no neighbors, then ...


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