Chapter 31: Load Balancing
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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If a modem is found for either of these two cases, and they pass all “DBC movable checks” (see
(page 924)), a DBC-REQ is sent to one or both of these modems to move the modem(s) to a more lightly
loaded channel set within the load balance group.
If no modem was found to move in the previous step, then do the following:
If the type attribute of the associated load balance policy/rule(s) includes bonded-dcc, then a search is made for a
bonded modem that resides on both the DS and US channels of the highly-loaded channel pair.
If such a modem is found, and it passes all “DCC movable checks”, a DCC-REQ is sent to this modem to move its
primary DS and US to the DS and US of the lightest-loaded channel pair.
If periodic-steeringD2 is enabled, and both non-D2.0 channels and D2.0 channels exist in the load balance group, then
a search is made for a non-bonded modem that resides on a TDMA or TDMA/ATDMA US channel of the load balance
group.
If such a modem is found, and it passes all “DCC movable checks”, a DCC-REQ is sent to this modem to move it to
the DS and US of the lightest-loaded channel pair that contains an ATDMA US channel.
If periodic-steeringD3 is enabled, and both non-D2.0 channels and D2.0 channels exist in the load balance group, then
a search is made for a bonded modem whose primary US channel is a TDMA or TDMA/ATDMA US channel of the load
balance group.
If such a modem is found, and it passes all “DCC movable checks”, a DCC-REQ is sent to this modem to move its
primary DS and US to the DS and US of the lightest-loaded channel pair that contains an ATDMA US channel.
Load Balancing Bonded DS and US Modems via DBC
Periodic load balancing of DOCSIS 3.0 bonded CMs using Dynamic Bonding Change (DBC) is supported. This allows for
moving a bonded modem without having to reset it, as is the case with load balancing using DCC. The goal of the DBC load
balancing function is to achieve an even distribution of load on the available channels of a load balance group.
Dynamic load balancing with DBC involves choosing one modem at periodic intervals to move from one US or DS channel-
set to a lighter-loaded US or DS channel-set. If an existing channel-set does not exist that meets all requirements, a new
channel-set may be created if dynamic bonding groups are enabled on the MAC domain. To enable this type of load
balancing, add bonded-ds-dbc and/or bonded-us-dbc to the list of load balancing types of the policy/rule associated with
the load balance group. The bonded modems need to be associated with a load balancing group that is enabled.
