Cisco SR2016T-NA Reference Manual page 70

cable downstream rate-limit
cable downstream rate-limit
To enable DOCSIS rate limiting on downstream traffic, use the cable downstream rate-limit command
in cable interface configuration mode. To disable DOCSIS rate limiting on downstream traffic, use the
no form of this command.
Syntax Description token-bucket
shaping
granularity msec
max-delay msec
weighted-discard
exp-weight
Defaults In Cisco IOS Release 12.1 EC and earlier releases, the system defaults to monitoring the traffic to and
from each CM over each 1-second period, and if the CM exceeds its bandwidth quota for that second,
the CMTS drops packets for the rest of the second (no cable downstream rate-limit).
In Cisco IOS Release 12.2 BC and later releases, the token-bucket and shaping keywords are on by
default, and the max-delay option is set to 128 milliseconds (cable downstream rate-limit token-
bucket shaping max-delay 128).
In Cisco IOS Release 12.2 BC, do not use the cable downstream rate-limit token command without
Note
specifying the shaping option, because this results in packet drops.
Command Modes Interface configuration (cable interface only)
Command History Release
11.3(6) NA
Cisco Broadband Cable Command Reference Guide
2-58
cable downstream rate-limit [token-bucket [[shaping [granularity msec | max-delay msec]] |
weighted-discard] [exp-weight]
no cable downstream rate-limit
Modification
This command was introduced.
(Optional) Specifies the token-bucket filter algorithm, which enforces
an average long-term transmission rate while permitting occasional
bursts.
(Optional in Release 12.1 EC, Required in Release 12.2 BC) Enables
rate limiting on the downstream port using the token-bucket policing
algorithm with default traffic shaping parameters.
(Optional) Specifies traffic shaping granularity in milliseconds. Valid
values are 1, 2, 4, 8, or 16 milliseconds.
(Optional) Specifies the maximum traffic-shaping buffering delay in
milliseconds. Valid values are 128, 256, 512, or 1028 milliseconds. As
a general guideline, the lower the downstream rates, the higher the
delay should be to ensure full use of the bandwidth.
(Optional) Specifies the weighted discard algorithm.
(Optional) Specifies the weight for the exponential moving average of
loss rate. Valid values are from 1 to 4.
Chapter 2 Cisco CMTS Configuration Commands
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