3com 8807 Reference Guide

Use the undo silent-interface command to enable the interface to transmit IS-IS 
packet.

By default, all the interface are allowed to transmit/receive IS-IS packets.

The silent-interface command is only used to suppress the packets to be 
transmitted on the interface, but the routes of this interface will still be 
transmitted from other interfaces.

# Prohibit the IS-IS packets to be transmitted via Interface Vlan-interface 3.

[3Com-isis] silent-interface Vlan-interface 3 

spf-delay-interval number

IS-IS view

number: Specifies number of routes to process before releasing CPU. It is in unit of 
piece with the range from 1000 to 50000. By default, the value is 2500 pieces.

Use the spf-delay-interval command to configure the number of routes to 
process before releasing CPU in the SPF calculation.

Use the undo spf-delay-interval command to restore the default setting.

When there are a large number of routes in the routing table, this command can 
be used to set that CPU resources are released automatically after a certain 
number of routes are processed. The unprocessed routes will be processed in one 
second. In this way, SPF calculation will not occupy the system resources for a long 
time, which has impact on the responding speed of the console.

The value of the number argument can be adjusted according to the capacity of 
the routing table. If the spf-slice-size command is also configured, the SPF 
calculation will be paused when any setting item is met.

By default, CPU is released once when every 2500 pieces of routes are processed.

Related command: spf-slice-size.

# Set IS-IS to release CPU once after processing every 3000 pieces of routes.

[3Com-isis] spf-delay-interval 3000 

spf-slice-size seconds