There are five OSPF timers:
To ensure efficient adjacency between OSPF neighbors, the S- K- and 7100-Series device provides hello-interval and dead-interval commands. The hello interval is the period between transmissions of hello packet advertisements. The dead interval is the period that can elapse without receiving a router‘s hello packets before its neighbors will declare it down.
Use the ip ospf hello-interval command in interface configuration command mode to configure the period between transmissions of hello packet advertisements.
Use the ip ospf dead-interval in interface configuration command mode to configure the period between receiving hello packets before the associated neighbor is declared down.
In order to ensure that flooding is reliable, LSAs are retransmitted until they are acknowledged. The period between retransmissions is the retransmit-interval. If this interval is set too low for an interface, needless retransmissions will take place. If the value is set too high, the speed of the flooding, during the period of lost packets, may be affected.
Use the ip ospf retransmit-interval command in interface configuration command mode to configure the retransmit-interval.
The transmit-delay is an estimation of the number of seconds it takes to transmit a link state update packet over this interface. This value should take into account transmission and propagation delays.
Use the ip ospf transmit-delay command in interface configuration command mode to configure the transmit-delay.
The SPF-delay is the amount of time that transpires between the receipt of an OSPF update and the SPF calculation.
Use the timers spf command in OSPF router configuration command mode to specify the amount of time between receiving an OSPF update and an SPF calculation occurring.
The OSPF timers can also be configured for an area virtual-link. See Configuring Area Virtual-Links.
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