H3C S7500E Series Command Manual page 428

Command Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches
Parameters
maximum-interval: Specifies the maximum interval (in seconds) for SPF calculations,
ranging from 1 to 120.
minimum-interval: Specifies the minimum interval (in milliseconds) for SPF calculations,
ranging from 10 to 60000.
incremental-interval: Specifies the incremental interval (in milliseconds) for SPF
calculations, ranging from 10 to 60000.
Description
Use the timer spf command to set the time intervals for ISIS routing calculation.
Use the undo timer spf command to restore the default.
The default IS-IS SPF calculation interval is 10 seconds.
When the network changes are infrequent, the SPF calculation interval decreases to
the minimum interval. When the network changes become frequent, the calculation
interval is increased by inc-interval*(2
triggered SPF calculations) until the maximum interval is reached.
With this feature, you can prevent the router from over consumption due to frequent
network changes.
Examples
# Set the maximum SPF calculation interval to 10 seconds, minimum interval to 100
milliseconds and the incremental interval to 200 milliseconds.
<Sysname> system-view
[Sysname] isis
[Sysname-isis-1]timer spf 10 100 200
# Set the maximum SPF calculation interval to 15 seconds.
<Sysname> system-view
[Sysname] isis
[Sysname-isis-1]timer spf 15
4.1.59 virtual-system
Syntax
virtual-system virtual-system-id
undo virtual-system virtual-system-id
View
IS-IS view
Chapter 4 IS-IS Configuration Commands
n-2
), (n is the number of network changes that
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