--> By Default OSPF LSA's are refreshed for every 30 minutes even though there is no change in the network.
--> Whenever the router receives new LSA, it will flood new LSA all over the interfaces except from it has received.
--> In Large networks this causes the problems like high cpu utilization, bandwidth utilization.
--> With OSPF Flood Reduction we can stop flooding of unnecessary lsa's by setting DoNotAge bit in OSPF LSA.
To Configure OSPF Flood Reduction
Router(config)# interface ethernet0/0
Router(Config-if)# ip ospf flood-reduction
--> Whenever the router receives new LSA, it will flood new LSA all over the interfaces except from it has received.
--> In Large networks this causes the problems like high cpu utilization, bandwidth utilization.
--> With OSPF Flood Reduction we can stop flooding of unnecessary lsa's by setting DoNotAge bit in OSPF LSA.
To Configure OSPF Flood Reduction
Router(config)# interface ethernet0/0
Router(Config-if)# ip ospf flood-reduction
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