In OSPF every LSA need to be refreshed every 30 minutes by default, this behavior can be unnecessary on stable network topologies. For that we can use ip ospf flood-reduction command on a per-interface basis, this command will reduce the LSA refresh flood from 30 minutes to around 50 minutes and by that will save unnecessary flood traffic.
Config example:
interface serial 0
ip address 192.42.110.201 255.255.255.0
ip ospf flood-reduction
ip ospf authentication-key abcdefgh
ip ospf cost 10
!
interface serial 1
ip address 131.119.251.201 255.255.255.0
ip ospf flood-reduction
ip ospf authentication-key ijklmnop
ip ospf cost 20
ip ospf retransmit-interval 10
ip ospf transmit-delay 2
ip ospf priority 4
The half hour period is a bit much
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