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Advanced-Mode DOCSIS Set-Top Gateway 1.2 for the Cisco CMTS Routers
See the
Operations, on page 20
NAT for DSG Unicast-only Mapping
A-DSG 1.2 supports multicast IP addressing. However, it also supports unicast IP destination addresses. On
the Cisco cBR-8 router, DSG 1.2 support is provided with the configuration of Network Address Translation
(NAT) on the router, to include these settings:
• WAN interface(s) are configured with the ip nat outside command.
• Cable interface(s) are configured with the ip nat inside command.
• For each mapping, additional configuration includes the source static multicast IP address and the unicast
The unicast IP address is the unicast destination IP address of the DSG packets arriving at the Cisco CMTS
router. The multicast IP address is the new destination IP address that is configured to map to one or a set of
DSG tunnels.
PIM and SSM for Multicast
When using Source Specific Multicast (SSM) operation in conjunction with A-DSG 1.2, the following
system-wide configuration command must be specified:
• ip pim ssm
Refer to the
Subinterfaces
A-DSG 1.2 supports subinterfaces on the Cisco CMTS router.
Information About Advanced-Mode DSG Issue 1.2
A-DSG 1.2 offers these new or enhanced capabilities:
• A-DSG client and agent modes
• Advanced-mode MIBs supporting DSG 1.2, including the DOCS-DSG-IF-MIB
• Advanced-mode tunnels with increased security
• Cable interface bundling through virtual interface bundling
• Downstream Channel Descriptor
• IP multicast support
• Quality of Service (QoS)
Configuring the Default Multicast Quality of Service, on page 14
for additional Multicast information and global configurations supporting DSG.
IP address.
Configuring IP Multicast Operations, on page
Cisco cBR Series Converged Broadband Routers Application—Voice and Video Configuration Guide
NAT for DSG Unicast-only Mapping
and the
Configuring IP Multicast
20.
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