Rockwell Automation Publication 1783-UM007G-EN-P - February 2017 343
Configure Switch Features Chapter 7
Flood Pacing Type the time at which LSAs in the flooding queue are paced between updates.
Valid values: 5…100 ms
Default: 33 ms
The default settings for OSPF packet pacing timers are suitable for most OSPF deployments.
Do not change the packet pacing timers unless all other options to meet OSPF packet flooding requirements have been exhausted. Specifically, we
recommend that network operators use summarization, stub area usage, queue tuning, and buffer tuning before changing the default flood
timers. There are no guidelines for changing timer values; each OSPF deployment is unique and must be considered on a case-by-case basis.
LSA Group Pacing Type the number of seconds in the interval at which LSAs are grouped and refreshed, checksummed, or aged.
OSPF LSA group pacing allows the router to group OSPF LSAs and pace the refreshing, check-summing, and aging functions for more efficient
router use. 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 is beneficial. If you have a small database
(40…100 LSAs), increasing the pacing interval to 10…20 minutes can benefit you slightly.
Valid values: 10…1800 s
Default: 240 s
Retransmission Type the time in milliseconds at which LSAs in the retransmission queue are paced.
Valid values: 5…200 ms
Default: 66 ms.
Initial LSA Delay Type the delay in milliseconds to generate the first occurrence of the LSA.
Default: 0 ms
Min LSA Hold Time Type the minimum delay in milliseconds to originate the same LSA.
Default: 5000 ms
Max LSA Wait Time Type the maximum delay in milliseconds to originate the same LSA.
Default: 5000 ms
Initial SPF Delay Type the time in milliseconds between when OSPF receives a topology change and when the SPF calculation starts. Valid values: 0…60,0000 ms
Min SPF Hold Time Type the hold time in milliseconds between consecutive SPF calculations.
Valid values: 0…60,0000 ms
Max SPF Wait Time Type the maximum wait time between two consecutive SPF calculations.
Valid values: 0…60,0000 ms
Adjacency Changes
Log Neighbor Changes Enables the logging of syslog messages when a neighbor state changes.
Default: Disabled (no adjacency changes are logged)
Include Detail Enables the logging of syslog messages whenever any state change occurs, not just when a neighbor goes up or down.
Default: Disabled
Table 91 - Customize OSPF Parameters (continued)
Field Description
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