Chapter 19: DOCSIS Set-top Gateway Configuration
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Configuring for Advanced DSG Mode
Configure IP Forwarding
It is recommended that you do not configure static IP forwarding for advanced DSG tunnels. The advanced DSG tunnel
traffic is forwarded at the time when the advanced DSG tunnel is configured.
Configuring DCD and QoS
When using advanced DSG, the CMTS must send a DCD on all downstreams where DSG tunnels are provisioned. A DCD
may also be sent on downstreams where no DSG tunnels are provisioned so that STBs can find the channels carrying the
DSG tunnels more quickly. QoS provides the ability to rate limit the DSG tunnel traffic as well as give the traffic a priority.
The configuration of DCD and QoS is described in the next section.
Advanced DSG Configuration
The primary components of advanced DSG configuration are:
DS Cable Interface
DSG Tunnel
DSG Classifier
These components are what is used to build the DCD that is sent on the DS cable interface and to establish forwarding of
the DSG tunnel traffic. The command to view the contents of the DCD for an interface is:
show interface cable-downstream <slot>/<port>[<.subif#>] cable dsg dcd
Sample output:
DCD Fragment Rate: 900ms
DCD Fragment 1 of 1; Cfg change count: 2
Rule Id: 1
Priority: 0
Client Ids
Broadcast: 1 (SCTE-65)
Tunnel Address: 0100.5e01.0101
Classifier Id: 1
DSG Classifier Id: 1
Priority: 0
Destination IP: 230.1.1.1