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Chapter 2
Cisco CMTS Configuration Commands
Release
12.0(5)T
12.0(7)XR2
12.1(4)CX
12.2(11)CY,
12.2(11)BC2
12.2(15)BC21
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
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:
Table 2-6
TLV
10
11
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
OL-1581-08
Modification
The ip-precedence option was added, and the range for the
max-downstream option was increased.
The output was reorganized and name, grant-size, and grant-interval
parameters were added.
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
service class
The maximum length of the name string was increased from 32 characters
to 80 characters.
The ip-precedence and max-downstream options were removed, because
their functions can be better accomplished through the DOCSIS
configuration file.
Cisco VSIF Fields for IP Precedence and Max Downstream Rate
Length
1
9
11.1
1
11.2
4
command for details.
cable service class
command instead.
Value
Description
0 to 2
Number of phone lines allowed for the CM.
1 to 2
IP precedence and maximum downstream rate
values, as defined by the following sub-TLVs.
0 to 7
IP precedence value, where 5 is the highest
priority (and values 6 and 7 are reserved).
rate in bps
Maximum downstream rate in bits per second
(bps), such as 64000 or 256000.
Cisco Broadband Cable Command Reference Guide
cable qos profile
cable
2-201
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