Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 4 Integrated IS-IS Configuration Commands
3Com Corporation
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4.1.41 spf-slice-size
Syntax
spf-slice-size seconds
undo spf-slice-size
View
IS-IS view
Parameter
seconds: Duration time in seconds for SPF calculation each time in the range from 0 to
120. When the calculation duration time reaches or exceeds the set value, the
calculation of this time ends. If seconds is set to 0, it indicates that SPF calculation is
not divided into slices and it will operate until the end. By default, the value is 0.
Description
Use the spf-slice-size command to configure whether to set slice and the duration time
each time when IS-IS performs SPF route calculation.
Use the undo spf-slice-size command to restore the default setting.
When there are a large number of routes in the routing table, this command can be
used to enable the SPF calculation in slices to prevent it from occupying the system
resources for a long time. Each time the router processes some route information, it will
free CPU to process other things, and process route information after 1 second.
The user is recommended to use the command when the number of routes reaches
150,000 or 200,000 and the value of seconds is recommended as 1. In other cases,
the default setting should be used, that is, SPF runs to the end with no slice.
If the spf-delay-interval command is also configured, when SPF calculation is run, the
SPF calculation will be paused if any setting item is met.
Related command: spf-delay-interval.
Example
# Set the SPF duration time to 1 second.
[3Com -isis] spf-slice-size 1
4.1.42 summary
Syntax
summary ip-address mask [ level-1 | level-1-2 | level-2 ]
undo summary ip-address mask [ level-1 | level-1-2 | level-2 ]