H3C Technologies H3C S10500 Series Switches - Manual (Page 71)

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Setting the shortest SPF calculation interval
SPF calculations occur when the LSDB changes. To limit the amount of CPU resources consumed by
frequent SPF calculations, you can change the shortest SPF calculation interval.
The shortest SPF calculation interval defines the minimum interval between two consecutive SPF
calculations. A smaller value means that FSPF responds faster to fabric changes by recalculating routes
in a VSAN, but it requires more CPU resources.
To set the shortest SPF calculation interval:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VSAN view. vsan vsan-id N/A
3. Set the shortest SPF
calculation interval.
fspf spf-hold-time value The default setting is 0 seconds.
Setting the minimum LSR arrival interval
The minimum LSR arrival interval specifies the interval between received LSR updates in a VSAN. Any LSR
updates that arrive before this interval expires are dropped. This helps avoid frequent SPF calculations
caused by LSDB updating.
To set the minimum LSR arrival interval:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VSAN view. vsan vsan-id N/A
3. Set the minimum LSR
arrival interval.
fspf min-ls-arrival value The default setting is 1 second.
Setting the minimum LSR refresh interval
The minimum LSR refresh interval specifies the interval at which LSRs are refreshed. To reduce SPF
calculations and LSR flooding in a fabric caused by frequent LSR refreshing, the switch cannot refresh
local LSRs within this interval.
To set the minimum LSR refresh interval:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VSAN view. vsan vsan-id N/A
3. Set the minimum LSR
refresh interval.
fspf min-ls-interval value The default setting is 5 seconds.