Cisco Broadband Cable Command Reference Guide

Chapter 2 Cisco Cable Modem Termination System Commands
cable insertion-interval
Syntax Description
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Cisco Broadband Cable Command Reference Guide
cable insertion-interval
To configure the interval between consecutive initial ranging slots on an upstream, use the cable
insertion-interval interface configuration command. To configure the automatic setting and ignore any
minimum or maximum time settings, use the no form of this command.
cable insertion-interval [fixed-inrvl | automatic [min-intrvl | max-intrvl]]
no cable insertion-interval
Defaults Automatic (dynamically varying the frequency of initial ranging upstream slots between 50 milliseconds
and 2 seconds)
Command Modes Interface configuration (cable interface only)
Command History
fixed-intrvl (Optional) Fixed interval between initial ranging slots in milliseconds
(ms).
automatic (Optional) Causes the Cisco CMTS MAC scheduler for each upstream
CM to vary the initial ranging times available to new CMs joining the
network.
min-intrvl (Optional) Minimum value in msecs between the initial ranging slots
on the upstream. Valid range is 25 to 200 ms. Default is 50 ms.
max-intrvl (Optional) Maximum value in msecs between the initial ranging slots
on the upstream. Valid range is 500 to 2000 ms. Default is 500 ms.
Release Modification
11.NA This command was introduced.
12.1 T This command was modified.
Usage Guidelines Use this command to specify the minimum and maximum duration between initial ranging opportunities
that appear in MAP messages sent by the Cisco CMTS. MAP messages define the precise time intervals
during which CMs can send.
The default insertion interval setting (automatic) configures the Cisco CMTS to optimize the initial ranging
times available to new CMs that attempt to join the network. The optimization algorithm automatically varies
the initial ranging times between 50 milliseconds and 2 seconds based on the number of CMs attempting
to come online.
Use the cable insertion-interval automatic command to bring a large number of CMs online quickly
(for example, after a major power failure). After the CMs have come online, you can override the
automatic keyword by giving this command again and specifying an insertion interval.
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