Cisco Broadband Cable Command Reference Guide

cable spectrum-group shared
cable spectrum-group shared
Syntax Description
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Cisco Broadband Cable Command Reference Guide
Chapter 2 Cisco Cable Modem Termination System Commands
To specify that the upstream ports in a spectrum group share the same upstream frequency, use the cable
spectrum-group shared command in global configuration mode. To delete this specification, use the no
form of this command.
cable spectrum-group groupnum shared
no cable spectrum-group groupnum shared
Defaults Upstream port frequency is the same for all ports in the spectrum group.
Command Modes Global configuration
Command History
groupnum Spectrum group number. Valid values are from 1 to 32.
Release Modification
12.1 T This command was introduced.
Usage Guidelines Because this command forces upstream ports to use the same spectrum, do not use this command for
overlapping carriers.
Caution Depending on the frequencies being used, and how cable modems are distributed across those
frequencies and among spectrum groups, switching from a group from shared to non-shared, or from
non-shared to shared, could cause CMs in the spectrum group to go offline and begin reranging
procedures. You should therefore use this command only during regularly schedule maintenance times,
so that a minimum number of online customers are affected.
Note This command does not enable any sort of load balancing on the shared upstreams.
Examples The following example shows how to specify that all the upstream ports for spectrum group 4 share the
same upstream frequency, and that these upstream frequencies are not assigned to other upstream
interfaces:
Router(config)# cable spectrum-group 4 shared
Router(config)#
OL-1581-05