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int s0/0.100
ip ospf database-filter all out
Will allow receiving Hello and LSA from peer
But wont sent out our LSA to them. Our Hellos are still sent out.
==> WE form adjacency with peer. WE get their LSA and install in our routing table
==>Peer forms adjacency with us. peer doesnt get our LSA and hence doesnt see our routes.
==> One way Traffic Flow.... Can be useful in Redundant links / FR Hub n Spoke Topology
The Biggest difference between passive-interface and database-filter is with passive-interface, even hellos are not sent out. So no adjacency and no one way communication.
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