--> By default OSPF sends hello messages for every 10 seconds and Link State Advertisements for every 30 minutes to maintain neighbor relationship & Link State Database.
--> OSPF Demand Circuit allows to suppress hello and link state advertisement messages.
--> When we configure Demand Circuit hello messages and link state advertisements messages are not sent on the link.
--> Demand Circuit Should be configured on point to point network and point to multipoint networks only.
--> Periodic LSA's can be sent only if the router does not understand demand circuit or any changes in the network topology.
--> To configure Demand Circuit
Router(config)# interface fastethernet0/0
Router(config-if)# ip ospf demand-circuit
Note: The main difference between OSPF Demand Circuit and Flood Reduction is Flood Reduction suppresses only periodic LSA whereas Demand Circuit Suppresses both Hello as well as Periodic LSAs.
--> OSPF Demand Circuit allows to suppress hello and link state advertisement messages.
--> When we configure Demand Circuit hello messages and link state advertisements messages are not sent on the link.
--> Demand Circuit Should be configured on point to point network and point to multipoint networks only.
--> Periodic LSA's can be sent only if the router does not understand demand circuit or any changes in the network topology.
--> To configure Demand Circuit
Router(config)# interface fastethernet0/0
Router(config-if)# ip ospf demand-circuit
Note: The main difference between OSPF Demand Circuit and Flood Reduction is Flood Reduction suppresses only periodic LSA whereas Demand Circuit Suppresses both Hello as well as Periodic LSAs.
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