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Cisco Broadband Cable Command Reference Guide
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Chapter 2 Cisco CMTS Configuration Commands
cable upstream rate-limit
cable upstream rate-limit
To set DOCSIS rate limiting for an upstream port on a cable interface line card, use the
cable upstream
rate-limit
command in cable interface configuration mode. To disable DOCSIS rate limiting for the
upstream port, use the
no
form of this command.
cable upstream
n
rate-limit
[
token-bucket
[
shaping
]]
no cable upstream
n
rate-limit
Syntax Description
Defaults
Token-bucket algorithm with traffic shaping
Command Modes
Interface configuration (cable interface only)
Command History
Usage Guidelines
Upstream rate limiting allows upstream bandwidth requests from rate-exceeding CMs to be buffered
without incurring TCP-related timeouts and retransmits. This enables the Cisco CMTS to enforce the
peak upstream rate for each CM without degrading overall TCP performance for the subscriber CPE
devices. Upstream grant shaping is per cable modem (SID).
When the
token-bucket
algorithm is configured, the Cisco CMTS automatically drops packets in
violation of allowable upstream bandwidth.
Use of the default value (the upstream port’s rate limit) enforces strict DOCSIS-compliant rate limiting.
Cisco highly recommends to using the default setting of
token-bucket
with the
shaping
option.
Examples
The following example shows how to configure the token bucket filter algorithm with traffic shaping on
upstream port 4:
router(config-if)#
cable upstream 4 rate-limit token-bucket
n
Specifies the upstream port number. Valid values start with 0 for the
first upstream port on the cable interface line card.
token-bucket shaping
(Optional) Enables rate limiting for the specified upstream cable
interface using the token-bucket policing algorithm. The
shaping
option enables token-bucket shaping.
Release
Modification
11.3(6)NA
This command was introduced.
11.3(9)NA
The
shaping
keyword was added.
Содержание Broadband Cable
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