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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
Bandwidth Management Features
This section describes the following bandwidth management feature available on the Cisco uBR7200
Series:
• Load Balancing Support, page 1-33
Load Balancing Support
Cisco IOS Release 12.3(9a)BC introduces support for Load Balancing on the Cisco uBR7246VXR
router. The Load Balancing feature allows system operators to distribute cable modems across radio
frequency (RF) downstreams and upstreams, to maximize bandwidth and usage of the cable plant.
The Load Balancing feature allows service providers to optimally use both downstream and upstream
bandwidth, enabling the deployment of new, high-speed services such as voice and video services. This
feature also can help reduce network congestion due to the uneven distribution of cable modems across
the cable network and due to different usage patterns of individual customers.
By default, the Cisco CMTS platforms use a form of load balancing that attempts to equally distribute
the cable modems to different upstreams when the cable modems register. You can refine this form of
load balancing by imposing a limit on the number of cable modems that can register on any particular
upstream, using the cable upstream admission-control command.
However, this default form of load balancing affects the cable modems only when they initially register
with the Cisco CMTS. It does not dynamically rebalance the cable modems at later times, such as when
they might change upstream channels in response to RF noise problems, or when bandwidth conditions
change rapidly because of real-time traffic such as Voice over IP (VoIP) and video services. It also does
not affect how the cable modems are distributed among downstream channels.
For additional information about configuring Load Balancing on the Cisco CMTS, refer to the following
document on Cisco.com:
• Configuring Load Balancing for the Cisco CMTS
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a00801b17f2.html
Cisco IOS Command-Line Enhancements
In addition to new or enhanced commands that tie to a specific feature, this section describes general
enhancements to Cisco IOS Software commands that support the Cisco uBR7200 series.
• exec prompt timestamp Command, page 1-33
• parser cache Command, page 1-34
• show Command Enhancements, page 1-35
• Cisco IOS Release 12.3(9a)BC Command-Line Interface (CLI) Enhancements, page 1-36
In some cases, additional feature descriptions that relate to these commands are available elsewhere in
this chapter.
exec prompt timestamp Command
Cisco IOS Release 12.1(12c)EC and 12.2(8)BC2 add a new command, exec prompt timestamp. This
command adds load information and a timestamp to all show commands. This can be useful for
troubleshooting and system analysis.