timers (OSPFv2)

Configures Link State Advertisement (LSA) pacing and Shortest Path First (SPF) throttle timers.

Syntax

timers { lsa-group-pacing interval | throttle spf start hold max }

Command Default

See the parameters section for specific defaults.

Parameters

lsa-group-pacing interval

Specifies the interval at which OSPF LSAs are collected into a group and refreshed, check-summed, or aged by the OSPF process. Valid values range from 10 to 1800 seconds. The default is 240 seconds.

throttle spf

Specifies start, hold and maximum wait intervals for throttling SPF calculations for performance. The values you enter are in milliseconds.

start: Initial SPF calculation delay. Valid values range from 0 to 60000 milliseconds. The default is 0.
hold: Minimum hold time between two consecutive SPF calculations. Valid values range from 0 to 60000 milliseconds. The default is 0.
max: Maximum wait time between two consecutive SPF calculations. Valid values range from 0 to 60000 milliseconds. The default is 0.

Modes

OSPF router configuration mode

OSPF VRF router configuration mode

Usage Guidelines

The device paces LSA refreshes by delaying the refreshes for a specified time interval instead of performing a refresh each time an individual LSA refresh timer expires. The accumulated LSAs constitute a group, which the device refreshes and sends out together in one or more packets.

The LSA pacing interval is inversely proportional to the number of LSAs the device is refreshing and aging. For example, if you have a large database of 10,000 LSAs, decreasing the pacing interval enhances performance. If you have a small database of about 100 LSAs, increasing the pacing interval to 10 to 20 minutes may enhance performance.

The no timers lsa-group-pacing command restores the pacing interval to its default value.

The no timers throttle spf command sets the SPF timers back to their defaults.

Examples

The following example sets the LSA group pacing interval to 30 seconds.

device# configure terminal
device(config)# router ospf
device(config-router-ospf-vrf-default-vrf)# timers lsa-group-pacing 30

The following example sets the SPF delay to 10000 milliseconds, the hold time to 15000 milliseconds, and the maximum wait time to 30000 milliseconds.

device# configure terminal
device(config)# router ospf
device(config-router-ospf-vrf-default-vrf)# timers throttle spf 10000 15000 30000