Chapter 31: Load Balancing
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 893
Load Balancing Methods
The load on the channels of a load balancing group is based on either CM count or channel utilization. Either of these
methods may be provisioned per load balancing group policy. These methods are mutually exclusive for a load balancing
group.
CM COUNT — This method (defined as method modem in CLI output) uses the number of CMs on a channel as its load in a
load balancing group. When choosing a modem to move, a modem residing on the channel pair with the greatest number
of modems is moved to the channel pair with the least number of modems. Modem counts are updated every 10 seconds.
CHANNEL UTILIZATION — This method (defined as method utilization in CLI output) uses the recent channel utilization of
the channel as its load in a load balancing group. Channel utilization for upstreams will be computed by number of
minislots used by the map maker for unicast grants divided by the total number of minislots available over a fixed time
interval. Channel utilization for downstreams is computed as total bytes sent divided by the total available bandwidth over
the measurement interval. When choosing a modem to move, a modem residing on the channel pair with the greatest
utilization is moved to the channel pair with the least utilization. Channel utilization is updated every 60 seconds.
Load Balancing Types
There are five main types of load balancing that can be specified. Multiple load balancing types per load balance rule are
allowed by the CLI. Each type is individually configurable. The types are:
Static (default)
Non-bonded DCC (formerly Dynamic) (default)
Bonded-US-DBC
Bonded-DS-DBC
Bonded DCC
Static Load Balancing of CMs occurs during the initial ranging phase. The first opportunity for load balancing is when a CM
initially ranges. During this time, the CM may be requested to move to a different upstream channel via an upstream
channel override in the range response. This mechanism at this stage is compatible with all CM versions.
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