H3C S7500E Series

Command Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 3 OSPF Configuration Commands
3-59
Examples
# Enable the sending of SNMP traps for all OSPF processes.
<Sysname> system-view
[Sysname] snmp-agent trap enable ospf
3.1.58 spf-schedule-interval
Syntax
spf-schedule-interval maximum-interval [ minimum-interval [ incremental-interval ] ]
undo spf-schedule-interval
View
OSPF view
Parameters
maximum-interval: Maximum SPF calculation interval in seconds, in the range 1 to 60.
minimum-interval: Minimum SPF calculation interval in milliseconds, in the range 10 to
60000, which defaults to 0.
incremental-interval: Incremental value in milliseconds, in the range 10 to 60000, which
defaults to 5000.
Description
Use the spf-schedule-interval command to set the OSPF SPF calculation interval.
Use the undo spf-schedule-interval command to restore the default.
The interval defaults to 5 seconds.
Based on its LSDB, an OSPF router calculates the shortest path tree with itself being
the root, and uses it to determine the next hop to a destination. Through adjusting the
SPF calculation interval, you can protect bandwidth and router resources from being
over-consumed due to frequent network changes.
With this command configured, when network changes are not frequent, SPF
calculation applies at the minimum-interval. If network changes become frequent, the
SPF calculation interval is incremented by the incremental-interval each time a
calculation happens, up to the maximum-interval.
Examples
# Configure the SPF calculation maximum interval as 10 seconds, minimum interval as
500 milliseconds and incremental interval as 200 milliseconds.
<Sysname> system-view
[Sysname] ospf 100
[Sysname-ospf-100] spf-schedule-interval 10 500 200