Cisco Systems 3560 사용자 설명서
36-31
Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 36 Configuring IP Unicast Routing
Configuring OSPF
Changing 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 feature is enabled by default with
a 4-minute default pacing interval, and you will not usually need to modify this parameter. The optimum
group pacing interval is inversely proportional to the number of LSAs the router is refreshing,
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 database (40 to 100 LSAs),
increasing the pacing interval to 10 to 20 minutes might benefit you slightly.
check-summing, and aging functions for more efficient router use. This feature is enabled by default with
a 4-minute default pacing interval, and you will not usually need to modify this parameter. The optimum
group pacing interval is inversely proportional to the number of LSAs the router is refreshing,
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 database (40 to 100 LSAs),
increasing the pacing interval to 10 to 20 minutes might benefit you slightly.
Beginning in privileged EXEC mode, follow these steps to configure OSPF LSA pacing:
To return to the default value, use the no timers lsa-group-pacing router configuration command.
Step 7
ip auto-cost reference-bandwidth ref-bw
(Optional) Specify an address range for which a single route will be
advertised. Use this command only with area border routers.
advertised. Use this command only with area border routers.
Step 8
distance ospf {[inter-area dist1] [inter-area
dist2] [external dist3]}
dist2] [external dist3]}
(Optional) Change the OSPF distance values. The default distance
for each type of route is 110. The range is 1 to 255.
for each type of route is 110. The range is 1 to 255.
Step 9
passive-interface type number
(Optional) Suppress the sending of hello packets through the
specified interface.
specified interface.
Step 10
timers throttle spf spf-delay spf-holdtime
spf-wait
spf-wait
(Optional) Configure route calculation timers.
•
spf-delay—Delay between receiving a change to SPF
calculation. The range is from 1 to 600000. miliseconds.
calculation. The range is from 1 to 600000. miliseconds.
•
spf-holdtime—Delay between first and second SPF calculation.
The range is form 1 to 600000 in milliseconds.
The range is form 1 to 600000 in milliseconds.
•
spf-wait—Maximum wait time in milliseconds for SPF
calculations. The range is from 1 to 600000 in milliseconds.
calculations. The range is from 1 to 600000 in milliseconds.
Step 11
ospf log-adj-changes
(Optional) Send syslog message when a neighbor state changes.
Step 12
end
Return to privileged EXEC mode.
Step 13
show ip ospf [process-id [area-id]] database Display lists of information related to the OSPF database for a
specific router. For some of the keyword options, see the
.
Step 14
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Command
Purpose
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
router ospf process-id
Enable OSPF routing, and enter router configuration mode.
Step 3
timers lsa-group-pacing seconds
Change the group pacing of LSAs.
Step 4
end
Return to privileged EXEC mode.
Step 5
show running-config
Verify your entries.
Step 6
copy running-config startup-config
(Optional) Save your entries in the configuration file.