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Cisco Broadband Cable Command Reference Guide
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Chapter 2 Cisco CMTS Configuration Commands
cable qos profile
Usage Guidelines The cable qos profile command configures the quality of service (QoS) settings for a particular class of
service on a DOCSIS 1.0 or DOCSIS 1.0+ network. This command cannot be used on DOCSIS 1.1 and
DOCSIS 2.0 networks, which use the
cable service class command instead.
In Cisco IOS Release 12.2(15)BC21, the ip-precedence and max-downstream options were removed.
If you are supporting DOCSIS 1.0+ CMs that require these parameters for voice over IP (VoIP) traffic
and other real-time traffic, use the following Cisco Vendor-Specific Fields (VSIF) in the CM’s DOCSIS
configuration file:
Examples The following example shows how to configure QoS profile 4 with a guaranteed upstream rate of 8 kbps,
a maximum transmission burst of 1800 bytes, a maximum downstream rate of 128 kbps, a priority of 4,
cable baseline privacy set, and a tos-overwrite mask and value byte (in hex) of 0x2:
router(config)# cable qos profile 4 guaranteed-upstream 8
router(config)# cable qos profile 4 max-burst 1800
router(config)# cable qos profile 4 max-downstream 128
router(config)# cable qos profile 4 privacy
router(config)# cable qos profile 4 priority 4
router(config)# cable qos profile 4 tos-overwrite 0xE0 0xE0
12.0(5)T The ip-precedence option was added, and the range for the
max-downstream option was increased.
12.0(7)XR2 The output was reorganized and name , grant-size , and grant-interval
parameters were added.
12.1(4)CX This command was deprecated for DOCSIS 1.1 use, because DOCSIS 1.1
replaces the QoS profile model with a service flow model. See the
cable
service class command for details.
12.2(11)CY,
12.2(11)BC2 The maximum length of the name string was increased from 32 characters
to 80 characters.
12.2(15)BC21 The ip-precedence and max-downstream options were removed, because
their functions can be better accomplished through the DOCSIS
configuration file.
Release Modification
Table 2-6 Cisco VSIF Fields for IP Precedence and Max Downstream Rate
TLV Length Value Description
10 1 0 to 2 Number of phone lines allowed for the CM.
11 9 1 to 2 IP precedence and maximum downstream rate
values, as defined by the following sub-TLVs.
11.1 1 0 to 7 IP precedence value, where 5 is the highest
priority (and values 6 and 7 are reserved).
11.2 4 rate in bps Maximum downstream rate in bits per second
(bps), such as 64000 or 256000.