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Friday, November 19, 2010

OSPF LSA Reduction

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

    

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