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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
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. DCC supports four
different initializations, instead of one, as in earlier DOCSIS support.
DCC and DCC for load balancing is supported on the Cisco uBR7246VXR router and the
CiscouBR10012 router with distributed cable interface line cards, including the CiscoMC28U and the
CiscoMC5X20S/U/H.
•Load Balancing techniques allow for moving cable modems with DCC by using configurable
initialization techniques.
•DCC allows line card channel changes across separate downstream channels in the same cable
interface line card, with the DCC initialization techniques ranging from 0 to 4.
•DCC transfers cable modem state information from the originating downstream channel to the target
downstream channel, and maintains synchronization of the cable modem information between the
cable interface line card and the Network Processing Engine (NPE) or Route Processor (RP).
•When the target channel is in ATDMA mode, only DOCSIS 2.0-capable modems can be
successfully load balanced. (Only DOCSIS 2.0-capable modems can operate on an ATDMA-only
upstream channel.) Cisco recommends identical channel configurations in a load balancing group.
Dynamic Channel Change for Load Balancing entails the following new or enhanced commands in
CiscoIOS Release 12.3(17a)BC, and later releases:
Global Configuration Commands
•cable load-balance group group-num dcc-init-technique <0-4>
•cable load-balance group group-num policy { pcmm | ugs }
•cable load-balance group group-num threshold {load | pcmm | stability | ugs} <1-100>
•cable load-balance group group-num threshold load <1-100> {minimum}
•cable load-balance group group-num threshold load <1-100> {enforce}
Testing Command
•test cable dcc mac-addr {slot/port | slot/subslot/port} target-us-channel-id ranging-technique
For configuration, command reference, testing, and examples for DCC on the Cisco CMTS, refer to the
following documents on Cisco.com:
•Load Balancing and Dynamic Channel Change (DCC) on the Cisco CMTS
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a00801b17f
2.html
•Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a00801b17f
2.html
Dynamic Modulation ProfilesFor each modulation profile configuration, the CiscouBR10012router supports the following:
•Burst profile interval usage code
•Burst profile number
•Burst type
•Differential encoding enable and disable
•FEC correctable bytes value
•Forward error correction (FEC) code word length