Cisco 7246VXR - uBR Router Software Configuration Manual page 116

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Changes from Cisco DSG 1.0
DSG Issue 1.0 is oriented to the DOCSIS DSG-I01 specifications, while DSG Issue 1.1 is oriented
towards DOCSIS DSG-I02 specifications, to include the new Advanced Mode DSG (A-DSG).
The following DSG 1.1 features are supported in 12.3(13a)BC while continuing support for Basic Mode
DSG:
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Unlike earlier issues of DSG, Advanced-mode DSG (A-DSG) uses a DOCSIS MAC Management Message
called the Downstream Channel Descriptor (DCD) message, and this DCD message manages the DSG
Tunnel traffic. The DCD message is sent once per second on each downstream and is used by the DSG
Client to determine which tunnel and classifier to use.
The DCD has a DSG address table located in the DOCSIS MAC management message. The primary
difference between DSG 1.0 (and earlier issues) and A-DSG 1.1 is that advanced mode uses DCD
messages to manage the DSG tunnels.
The DCD message contains a group of DSG Rules and DSG Classifiers, including the following:
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Prerequisites for DSG 1.1
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Restrictions and Caveats for DSG 1.1
Cisco DSG 1.1 has the following restrictions:
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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
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DSG 1.1 enables the learning of dynamic tunnel definitions. DSG 1.0 only had static tunnel
definitions (programmed into the set-top box).
DSG 1.1 features new Cisco IOS command-line interface (CLI) configuration and show commands
for A-DSG configuration and network information.
DSG rules and rule priority
DSG classifiers
DSG channel list type/length value (TLV)
DSG client identifier (whether broadcast, CA System, application, or MAC-level)
DSG timer list
DSG upstream channel ID (UCID) list
Vendor-specific information field
Cisco IOS release 12.3(13a)BC or a later 12.3 BC release are required.
Cisco DSG 1.1 is supported on the Cisco uBR10012 router with PRE2 performance routing engine
modules.
Cisco DSG 1.1 is supported on the Cisco uBR10012 router with the following cable interface line
cards and broadband processing engines (BPEs):
– Cisco uBR10-LCP2-MC16C/MC16E/MC16S Cable Interface Line Card
Cisco uBR10-LCP2-MC28C Cable Interface Line Card
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Cisco uBR10-MC5X20S/U Broadband Processing Engine
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Cisco DSG 1.1 does not support the PRE1 module on the Cisco uBR10012 router.
Cisco DSG 1.1 does not support Service Flow Quality of Service (QoS), which is available at Layer 3.
Cisco DSG 1.1 does not support tunnel security, but strictly access control lists (ACLs).
Cisco DSG 1.1 does not support subinterfaces.
Cisco DSG 1.1 does not support HCCP N+1 interoperability.
Cisco DSG 1.1 does not support SNMP MIBS for A-DSG.
Chapter 1 Overview of Cisco uBR7200 Series Software
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