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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-08
Chapter1 Overview of CiscouBR10012 Universal Broadband Router Software
Supported Software Features for the CiscouBR10012 Router
DOCSIS 1.0 per SID Bandwidth Request and Grant Counters
This feature promotes better control of higher-priority traffic, permitting per-SID bandwidth requests
and grants. Profiles can be customized for scheduling parameters required at subscriber sites for the
service offering.
The show interface cx/y/z sid counter command also supports a verbose option that displays:
•Number of bandwidth requests successfully received by the CiscouBR10012router from the
specified SID on the specified cable interface
•Number of grants issued by the CiscouBR10012router to the specified SID
DOCSIS 1.0 ToS Overwrite
Cisco IOS release 12.3(17a)BC2 introduces support for the DOCSIS 1.0 Type of Service (ToS)
Overwrite feature. Currently, ToS overwrite requires the creation of static cable QoS profiles, which are
then assigned to the ToS fields. This implementation works well if only a few different service types are
offered. However, scalability issues arise when large numbers of service types are presented; each
requiring a static QoS profile in order to perform ToS overwrite.
The Default DOCSIS 1.0 ToS Overwrite feature eliminates the need to create multiple QoS profiles in
order to perform type-of-service (ToS) overwrite by automatically bounding all DOCSIS 1.0 Cable
Modem (CM) created profiles to a default ToS overwrite.
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 uBR10012 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