OSPF Timers

InfTransDelay.  

The seconds by which LSAs exiting the interface will have their age incremented. In Figure 9.4, this is

displayed as Transmit Delay and is shown to be the Cisco default, 1 second. InfTransDelay can be changed with the command

 ip ospf transmit-delay.

Router Priority

Ip ospf priority (value)

Range in between 0- 255

Cisco’s default priority is One (1).

We can check Priority

Sh ip ospf interface fastethernet 0/0

               

HelloInterval

The period, in seconds, between transmissions of Hello packets on the interface. This period is advertised in Hello packets that are transmitted from the interface. Cisco uses a default of 10 seconds, which can be changed with the command ip ospf hello-interval

RouterDeadInterval  

The period, in seconds, that the router will wait to hear a Hello from a neighbor on the network to which the interface is connected before declaring the neighbor down. The RouterDeadInterval is advertised in

Hello packets transmitted from the interface. Cisco uses a default of four times the HelloInterval; the

default can be changed with the command ip ospf dead-interval used.

Wait Timer.  

The length of time the router will wait for a DR and BDR to be advertised in a neighbor's Hello packet before beginning a DR and BDR selection. The period of the wait timer is the RouterDeadInterval.

RxmtInterval  

The period, in seconds, the router will wait between retransmissions of OSPF packets that have not been acknowledged. Cisco default of 5 seconds is being used. An interface's RxmtInterval can be changed with the command ip ospf retransmit-interval.