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cable dsg
cable dsg
To enable the DOCSIS Set-Top Gateway (DSG) on a cable interface, and to configure its tunnel-mapping
parameters, use the cable dsg command in cable interface configuration mode. To remove the DSG
tunnel from the interface, use the no form of this command.
Syntax Description
tunnel-MAC-address
group-ip-address
CA-vendor-name
Defaults
No DSG tunnels are defined.
Command Modes
Interface and subinterface configuration (cable interface only)
Command History
Release
12.2(15)BC2
Usage Guidelines
This command enables DSG operations on the cable interface, creating a DSG tunnel that uses the
specified IGMP multicast address and well-known MAC address. If you specify a tunnel MAC address
of 0.0.0, the command converts it into an Ethernet multicast MAC address, using the following
algorithm, which is given in
Cisco Broadband Cable Command Reference Guide
2-66
cable dsg tunnel-MAC-address group-ip-address CA-vendor-name
no cable dsg tunnel-MAC-address group-ip-address CA-vendor-name
Modification
This command was introduced for the Cisco uBR7100 series and
Cisco uBR7246VXR routers.
RFC
An IP host group address is mapped to an Ethernet multicast address by placing the low-order 23-
bits of the IP address into the low-order 23 bits of the Ethernet multicast address 01-00-5E-xx-xx-
xx (hex). Because there are 28 significant bits in an IP host group address, more than one host group
address may map to the same Ethernet multicast address.
Well-known MAC address for the DSG tunnel. The tunnel-MAC-
address could also optionally be an Internet Group Management
Protocol (IGMP) multicast address, using the algorithm for converting
host group IP address to an Ethernet MAC address that is given in
1112. If the MAC address is 0000.0000.0000, the DSG tunnel uses the
algorithm given in
RFC 1112
tunnel.
You can specify only Global Scope (224.0.1.0 through
Note
238.255.255.255) and Administratively Scoped (239.0.0.0
through 239.255.255.255) addresses. You cannot use Local
Scope addresses (224.0.0.0 through 224.0.0.255).
Multicast group IP address for the DSG stream.
Name for the Conditional Access (CA) vendor that owns the DSG
tunnel. This parameter is a string up to 7 characters in length and
should match the vendor of the CA server. A maximum of four vendors
per router are supported.
1112:
Chapter 2
Cisco CMTS Configuration Commands
to derive the multicast address for the
RFC
OL-1581-08
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