Dell Force10 Z9000 FTOS Command Line Reference Guide for the Z9000 System FTOS - Page 905
Added support for SPF Throttling Enhancement., second_wait_inte, rval seconds, for IPv4
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Defaults Command Modes Command History Usage Information 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. Refer to Parameters. • ROUTER ISIS (for IPv4) • CONFIGURATION-ROUTER-ISIS-ADDRESS-FAMILY-IPV6 (for IPv6) Version 8.3.12.0 Version 7.8.1.0 Version 7.5.1.0 Introduced on the S4810. Added support for multi-topology ISIS. Added support for SPF Throttling Enhancement. 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 spfinterval 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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