Dell 9.7(0.0) manual Enter the maximum number of seconds between SPF

Defaults

Command Modes

Command History

Usage Information

interval	Enter the maximum number of seconds between SPF
seconds	calculations. The range is from 0 to 120 seconds. The default
	is 10 seconds.
initial_wait_inte	(OPTIONAL) Enter the initial wait time, in seconds, before
rval seconds	running the first SPF calculations. The range is from 0 to 120
	seconds. The default is 5 seconds.
second_wait_i	(OPTIONAL) Enter the wait interval, in seconds, between the
nterval seconds	first and second SPF calculations. The range is from 0 to 120
	seconds. The default is 5 seconds.

Refer to Parameters.

•ROUTER ISIS (for IPv4)

•CONFIGURATION-ROUTER-ISIS-ADDRESS-FAMILY-IPV6 (for IPv6)

This guide is platform-specific. For command information about other platforms, refer to the relevant Dell Networking OS Command Line Reference Guide.

The following is a list of the Dell Networking OS version history for this command.

VersionDescription

9.7(0.0) Introduced on the S6000-ON.

9.0.2.0Introduced on the S6000.

8.3.19.0Introduced on the S4820T.

8.3.11.1Introduced on the Z9000.

8.3.12.0Introduced on the S4810.

7.8.1.0Added support for multi-topology ISIS.

7.5.1.0Added support for SPF Throttling Enhancement.

This command spf-intervalin CONFIG-ROUTER-ISIS-AF-IPV6 mode is used for IPv6 Multi-Topology route computation only. If using Single Topology mode, use the spf-intervalcommand in CONFIG-ROUTER-ISIS mode for both IPv4 and IPv6 route computations.

SPF throttling slows down the frequency at which route calculations are performed during network instability. Even though throttling route calculations slows down network convergence, not throttling can result in a network not functioning as expected. If network topology is unstable, throttling slows down the scheduling of route calculations until the topology regains its stability.

The first route calculation is controlled by the initial wait interval and the second calculation is controlled by the second wait interval. Each subsequent wait interval is twice as long as the previous one until the wait interval reaches the maximum wait time specified (interval seconds). After the network calms down and there

908 Intermediate System to Intermediate System (IS-IS)