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Chapter 2
Cisco CMTS Configuration Commands
service-class
To create a DOCSIS configuration file that specifies the quality-of-service (QoS) service-class options
for the CM configuration file, use the service-class command in cable config-file configuration mode.
To disable the specification, use the no form of this command.
Syntax Description
class
guaranteed-upstream
us-bandwidth
max-burst burst-size
max-downstream
max-dsbandwidth
max-upstream max-
usbandwidth
priority priority-num
privacy
Defaults
Service-class is not set by default. A CM cannot register on a Cisco CMTS unless at least one parameter in
a service class is specified.
Command Modes
Cable config-file configuration
Command History
Release
12.1(2)EC1
12.2(4)BC1
Usage Guidelines
Default values can be used only if service-class class is specified. A single configuration file should not
contain multiple service-class ID numbers. Thus, all parameters should be set using a single service-class ID.
However, different configuration files can reuse the same service-class ID.
OL-1581-08
service-class class {guaranteed-upstream us-bandwidth max-burst burst-size max-downstream
max-dsbandwidth max-upstream max-usbandwidth priority priority-num privacy}
no service-class
Specifies service class number. Valid range is 1 to 16. Default value is 1.
Specifies the guaranteed upstream bandwidth in kbps. Valid range for us-
bandwidth is 0 to 100000 kbps. Default value is 0.
Specifies the maximum upstream burst size in bytes. Valid range for burst-
size is 0 to 65535. Default value is 0, unlimited burst length. Recommended
value range is 1600 to 1800 bytes. Using a value of 0 or greater than 1800 bytes
can cause latency issues for Voice-over-IP. A value of less than 1500 bytes
prevents upstream transmission of large Ethernet frames for any modem or
CMTS not implementing fragmentation (an optional feature in DOCSIS 1.0).
Specifies the downstream bandwidth in kbps. Valid range for max-
dsbandwidth is 0 to 100000 kbps. Default value is 0.
Specifies the upstream bandwidth in kbps. Valid range for max-usbandwidth
is 0 to 100000 kbps. Default value is 0.
Specifies the service class priority. Valid range for priority-num is 0 to 7,
where 7 is the highest-priority service-class setting.
Enables baseline privacy interface (BPI).
Modification
This command was introduced.
Support was added to the Release 12.2 BC train.
Cisco Broadband Cable Command Reference Guide
service-class
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