second_wait_inte
rval seconds
(OPTIONAL) Enter the wait interval, in seconds, between the first and
second SPF calculations. The range is 0 to 120 seconds. The default is
5 seconds.
Defaults Refer to Parameters.
Command Modes
• ROUTER ISIS (
for IPv4
)
• CONFIGURATION-ROUTER-ISIS-ADDRESS-FAMILY-IPV6 (
for IPv6
)
Command History
Version 8.3.12.0 Introduced on the S4810.
Version 7.8.1.0 Added support for multi-topology ISIS.
Version 7.5.1.0 Added support for SPF Throttling Enhancement.
Usage
Information
This command spf-interval in CONFIG-ROUTER-ISIS-AF-IPV6 mode is used for IPv6
Multi-Topology route computation only. If using Single Topology mode, use the spf-
interval command 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 are no triggers for two times the
maximum interval, fast behavior is restored (the initial wait time).
905
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