| OSPF routers must have the same hello
intervals and the same dead intervals to exchange information. By default, the dead interval is four times the
value of the hello interval. This means that a router has four chances
to send a hello packet before being declared dead.
On broadcast OSPF networks, the default
hello interval is 10 seconds and the default dead interval is 40
seconds. On nonbroadcast networks, the default hello interval is 30
seconds and the default dead interval is 120 seconds. These default
values result in efficient OSPF operation and seldom need to be
modified.
A network administrator is allowed to
choose these timer values. A justification that OSPF network
performance will be improved is needed prior to changing the timers.
These timers must be configured to match those of any neighboring
router.
To configure the hello and dead
intervals on an interface, use the following commands:
Router(config-if)#ip ospf
hello-interval seconds
Router(config-if)#ip ospf dead-interval seconds
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Lab Activity
Lab Exercise: Configuring OSPF Timers
This lab is to setup OSPF timers.
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Lab Activity
e-Lab Activity: Configuring OSPF Timers
In this lab, the student will adjust OSPF timers to maximize
efficiency of the network.
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