11-18
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 11 Configuring Networking Protocols
Configuring OSPF
Change LSA Group Pacing
The OSPF LSA group pacing feature allows the router to group OSPF LSAs and pace the refreshing,
check-summing, and aging functions for more efficient router use. This featu re is enabled by default with
a four-minute default pacing interval, and you do not usually need to modify this parameter. The
optimum group pacing interval is inversely proportional to the number of LSAs the router is refreshi ng,
check-summing, and aging. For example, if you have approximately 10,000 LSAs in the database,
decreasing the pacing interval would benefit you. If you have a very small databa se (40 to 100 LSAs),
increasing the pacing interval to 10 to 20 minutes might benefit you slightly.
Beginning in privileged EXEC mode, follow this procedure to configure OSPF LSA pacing:
To return to the default value, use the no timers lsa-group-pacing router configuration command.
Step 9 Router(config)# passive-interface
type
number
(Optional) Suppresses the sending of hello packets
through the specified interface.
Step 10 Router(config)# timers spf
spf-delay
spf-holdtime
(Optional) Configures route calculation timers.
• spf-delay—Enter an integer from 0 to 65535. The
default is 5 seconds; 0 means no delay.
• spf-holdtime—Enter an integer from 0 to 65535.
The default is 10 seconds; 0 means no delay.
Step 11 Router(config)# ospf log-adj-changes (Optional) Sends syslog message when a neighbor state
changes.
Step 12 Router(config)# end Returns to privileged EXEC mode.
Step 13 Router# show ip ospf [
process-id
[
area-id
]] database
Displays lists of information related to the OSPF
database for a specific router. For some of the keyword
options, see to the “Monitoring OSPF” section on
page 11-19.
Step 14 Router# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.
Command Purpose
Command Purpose
Step 1 Router# configure terminal Enters global configuration mode.
Step 2 Router(config)# router ospf
process-id
Enables OSPF routing, and enters router configuration mode.
Step 3 Router(config)# timers
lsa-group-pacing
seconds
Changes the group pacing of LSAs.
Step 4 Router(config)# end Returns to privileged EXEC mode.
Step 5 Router# show running-config Verifies your entries.
Step 6 Router# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.