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Cisco Broadband Cable Command Reference Guide
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Chapter 2 Cisco CMTS Configuration Commands
cable spectrum-group shared
cable spectrum-group shared
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
Syntax Description
Defaults
Upstream port frequency is the same for all ports in the spectrum group.
Command Modes
Global configuration
Command History
Usage Guidelines
Because this command forces upstream ports to use the same spectrum, you must ensure that you do not
configure spectrum groups that have overlapping frequencies. To use shared spectrum groups, each
group must be using a discrete set of frequencies.
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.
groupnum
Spectrum group number. Valid values are from 1 to 32, or from 1 to 40,
depending on the Cisco IOS software release.
Release
Modification
12.1 T
This command was introduced.
12.2(11)BC3
Support was added for this command on the Cisco uBR-LCP2-MC16S card
on the Cisco uBR10012 router.
12.2(15)BC2
The maximum number of spectrum groups was increased from 32 to 40
groups per router.
