Tuning OSPF

InformIT: CCIE Practical Studies, Volume I > Tuning OSPF.

Tuning OSPF

OSPF has several parameters for tuning timers, controlling broadcasts, and controlling routes and link-state propagation. The following list shows the syntax of the more common parameters adjustable for OSPF, explained in the text that follows.

Router(config-if)ip ospf hello-interval 
   interval_in_seconds
Router(config-if)ip ospf dead-interval 
   dead_interval_in_seconds
Router(config-if)ip ospf retransmit-interval

Use the ip ospf hello-interval interface command to change the hello timer for OSPF. The default value of this command is interface-dependent. By default, hello packets are sent every 10 seconds on broadcast and point-to-point networks, and 30 seconds on NBMA networks. All neighbors residing on a network and area should have equal hello timers. The dead-interval and wait timer automatically are changed when the hello interval is changed.

Use the ip ospf dead-interval command to change the dead interval received by this interface. The timer has a default vault of four times that of the hello timer, 40 seconds for broadcast and point-to-point networks, and 120 seconds for NBMA networks. Recall that the dead interval is the time that has to pass before a neighbor receives a hello before declaring it “dead.”

Use the ip ospf retransmit-interval command to change OSPF retransmission interval. All routers in the area should have the time set to the same value.

This entry was posted in Uncategorized. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s