R3303-HP HSR6800 Routers Layer 3 - IP Routing Command Reference

207
Default command level
2: System level
Parameters
maximum-interval: Specifies the maximum SPF calculation interval, in the range of 1 to 120 seconds.
initial-interval: Specifies the wait interval before the first SPF calculation, in the range of 10 to 60000
milliseconds.
second-wait-interval: Specifies the wait interval before the second SPF calculation, in the range of 10 to
60000 milliseconds.
Usage guidelines
• If only the maximum interval is specified, IS-IS waits the maximum interval before performing the
SPF calculation.
• If both the maximum and initial intervals are specified:
{ IS-IS waits the initial interval before performing the first SPF calculation.
{ When SPF calculation triggers occur at intervals shorter than the maximum interval, the
topology is considered unstable and IS-IS waits the maximum interval before performing the
SPF calculation until the topology is stable.
• If maximum-interval, initial-interval, and second-wait-interval are specified:
{ IS-IS waits the initial interval before performing the first SPF calculation.
{ When SPF calculation triggers occur at intervals shorter than the maximum interval, the
topology is considered unstable, IS-IS waits the second-interval before performing the second
SPF calculation and penalty is applied on the wait interval for the next SPF calculation. For each
subsequent trigger, the wait interval before SPF calculation is two times the previous wait
interval until the maximum interval is reached.
{ After the network topology becomes stable—triggers occur at intervals greater than the
maximum interval, and the wait interval before SPF calculation is restored to the initial interval.
Examples
# Configure the maximum SPF calculation interval as 10 seconds, the wait interval before the first SPF
calculation as 100 milliseconds, and the wait interval before the second SPF calculation as 200
milliseconds.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] timer spf 10 100 200
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.