Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 4 Integrated IS-IS Configuration Commands
3Com Corporation
4-37
4.1.45 timer spf
Syntax
timer spf seconds [ level-1 | level-2 ]
undo timer spf [ level-1 | level-2 ]
View
IS-IS view
Parameter
seconds: Specifies the SPF calculation interval, ranging from 1 to 120 and measured in
seconds. The default value is 5 seconds.
level-1: Sets Level-1 SPF calculation interval only.
level-2: Sets Level-2 SPF calculation interval only.
If the level is not specified, it defaults to SPF interval of Level-1.
Description
Use the timer spf command to configure the interval for the SPF calculation.
Use the undo timer spf command to restore the default setting.
In IS-IS protocol, when the LSDB of the corresponding level is changed, SPF
calculation is required. However, if the SPF calculation is performed too frequently, the
system efficiency will be lowered and a great number of resources on the network will
be occupied. SPF calculation interval can improve its calculation efficiency to some
degree. This setting can be made according to actual conditions.
Example
# Set the SPF calculation interval of the router to 3 seconds.
[3Com -isis] timer spf 3