Cisco CMTS supports
static load balancing for MTC/MRC modems and dynamic load balancing for non-MTC
and/or non-MRC modems. Inter-line card support is also included. Support for
configuration of load balancing groups (LBGs) that entail multiple interfaces,
multiple load balancing policies, and the option to configure multiple
additional load balancing parameters are also included
The load balancing
policies can be configured on the Cisco CMTS, indexed by an ID, to limit the
movement of cable modems within a Load Balancing Group (LBG). The cable modem
will forward TLV43.1in its registration request (REG-REQ) message, which is
then parsed and stored in the Cisco CMTS. A policy defines whether and when
cable modems can be moved within their load balancing groups.
During dynamic load
balancing, the specified policy of the cable modem is checked to determine
whether the cable modem is allowed to move.
supports Dynamic Channel Change (DCC). DCC in DOCSIS 1.1, dynamically changes
cable modem upstream or downstream channels without forcing a cable modem to go
offline, and without re-registration after the change.
distributes downstream load balancing with upstream channel loads in the same
upstream load balancing group. This improves upon the prior load balancing
limitation, in which load balancing was implemented on the basis of the entire
downstream channel load.
Load balancing uses
rules and policies to decide on moving the cable modems within their LB groups.
These policies are created on the Cisco CMTS and chosen on a per-CM basis using
type-length-value (TL V) portion (43.1,Policy ID) of REG-REQ. These policies
prohibit a modem from being moved or restricted.
A policy contains a
set of rules. When the policy is defined by multiple rules, all rules apply in
combinations. A rule can be defined as " enabled " , " disabled " , or
"disabled during time period. " Each rule can be used by more than one policy.
DOCSIS 3.0 static
modem count-based load balancing uses the dynamic bonding change (DBC) to
modify the following parameters of DOCSIS 3.0 cable modem with multiple
transmit channel (MTC) mode or multiple receive channel(MRC) mode without
primary channel change:
- Transmit channel set (TCS)
- Receive channel set (RCS)
- Downstream IDs (DSID) or
- Security association for
encrypting downstream traffic
These parameters and
additional load balancing schemes are supported on the Cisco CMTS, and
described in this document. This document describes all implementations of load
balancing on the Cisco CMTS, dependent upon the Cisco IOS release installed and
the desired parameters.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.