HP MSR2000/3000/4000 Router Series Layer 3 - IP Routing Command Reference

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Default
The maximum interval is 5 seconds, the minimum interval is 50 milliseconds, and the incremental interval
is 200 milliseconds.
Views
IS-IS view
Predefined user roles
network-admin
Parameters
maximum-interval: Specifies the maximum SPF calculation interval in the range of 1 to 120 seconds.
minimum-interval: Specifies the minimum SPF calculation interval in the range of 10 to 60000
milliseconds.
incremental-interval: Specifies the incremental SPF calculation interval in the range of 10 to 60000
milliseconds.
Usage guidelines
Based on the LSDB, an IS-IS router uses the SPF algorithm to calculate a shortest path tree with itself being
the root, and uses the shortest path tree to determine the next hop to a destination network. By adjusting
the SPF calculation interval, you can prevent bandwidth and router resources from being overused due
to frequent topology changes.
When network changes are not frequent, the minimum-interval is adopted. If network changes become
frequent, the SPF calculation interval is incremented by the incremental-interval each time a generation
happens until the maximum-interval is reached.
The minimum interval and the incremental interval cannot be greater than the maximum interval.
Examples
# Configure the maximum interval as 10 seconds, the minimum interval as 100 milliseconds, and the
incremental interval as 300 milliseconds.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] timer spf 10 100 300
virtual-system
Use virtual-system to configure a virtual system ID for the IS-IS process.
Use undo virtual-system to remove a virtual system ID.
Syntax
virtual-system virtual-system-id
undo virtual-system virtual-system-id
Default
No virtual system ID is configured.
Views
IS-IS view