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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-05
Chapter1 Overview of Cisco uBR7200 Series Software
Supported Software Features for the Cisco uBR7200 Series
• Building DOCSIS 1.0 Configuration Files Using Cisco DOCSIS Configurator, Document ID: 16480
http://www.cisco.com/en/US/customer/tech/tk86/tk168/technologies_tech_note09186a0080094d00.shtml
Enhanced Rate Bandwidth Allocation (ERBA) Support for DOCSIS 1.0 Cable Modems
Cisco IOS release 12.3(13a)BC introduces Enhanced Rate Bandwidth Allocation (ERBA) support for
DOCSIS 1.0 cable modems and the Cisco uBR7200 series router. ERBA allows DOCSIS1.0 modems to
burst their temporary transmission rate up to the full line rate for short durations of time. This capability
provides higher bandwidth for instantaneous bandwidth requests, such as those in Internet downloads,
without having to make changes to existing service levels in the QoS Profile.
This feature enables MSOs to set the DOCSIS 1.0 cable modems burst transmissions, with mapping to
overriding DOCSIS1.1QoS profile parameters on the Cisco CMTS. DOCSIS 1.0 cable modems require
DOCSIS 1.0 parameters when registering to a matching QoS profile. This feature enables maximum
downstream line rates, and the ERBA setting applies to all cable modems that register to the
corresponding QoS profile.
Note QoS definitions must previously exist on the Cisco CMTS headend to support this feature.
ERBA for DOCSIS 1.0 cable modems is supported with these new or enhanced commands or keywords
in Cisco IOS release 12.3(13a)BC:
• cable qos pro max-ds-burst burst-size
• show cable qos profile n [verbose]
To define ERBA on the downstream for DOCSIS 1.0 cable modems, use the cable qos promax-ds-burst
command in global configuration mode. To remove this ERBA setting from the QoS profile, use the no
form of this command.
cable qos pro max-ds-burst burst-size
no cable qos pro max-ds-burst
Syntax Description
To display ERBA settings as applied to DOCSIS 1.0 cable modems and QoS profiles on the Cisco
CMTS, use the show cable qos profile command in Privileged EXEC mode.
The following example of the cable qos profile command in global configuration mode illustrates
changes to the cable qos profile command. Fields relating to the ERBA feature are shown in bold for
illustration:
Router(config)# cable qos pro 10 ?
grant-interval Grant interval
grant-size Grant size
guaranteed-upstream Guaranteed Upstream
max-burst Max Upstream Tx Burst
max-ds-burst Max Downstream Tx burst (cisco specific)
max-downstream Max Downstream
max-upstream Max Upstream
name QoS Profile name string (cisco specific)
priority Priority
privacy Cable Baseline Privacy Enable
tos-overwrite Overwrite TOS byte by setting mask bits to value
burst-size The QoS profile’s downstream burst size in bytes.