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cable dsg
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In Cisco IOS Release 12.2(15)BC2, N+1 HCCP high-availability redundancy does not preserve the DSG
Note
traffic and configuration after a switchover. If you configure a cable interface for both N+1 HCCP
redundancy and for DSG operations, DSG traffic does not continue after a switchover.
Examples
The following example shows how to configure a cable interface on a Cisco uBR7246VXR router to
enable the DSG feature on cable interface 3/0, using a well-known MAC address of 0001.0002.0003 and
a destination IP address of 225.2.3.4:
Router# configure terminal
Router(config)# interface cable 3/0
Router(config-if)# ip pim dense-mode
Router(config-if)# ip multicast rate-limit out group-list 123 1024
Router(config-if)# cable dsg 1.2.3 225.2.3.4 CCC
Router(config-if)# exit
Router(config)# exit
Router#
The above configuration also automatically configures the interface with the appropriate IGMP static-
Note
group command (ip igmp static-group 225.3.4.5). This command will appear in the interface
configuration and should not be removed manually.
The following example shows the error message that appears if you specify a broadcast IP address that
has already been added to the router's IGMP database. This entry typically would have been created
manually on the router or dynamically by a CPE device that is attached to a cable modem on the cable
network.
Router# configure terminal
Router(config)# interface cable 3/0
Router(config-if)# cable dsg 1.1.1 224.3.3.10 cisco
Multicast group 224.3.3.10 is already in use on the interface Cable3/0, please retry.
Router#
The following example shows how to delete a DSG tunnel on a cable interface:
Router# configure terminal
Router(config)# interface cable 4/0
Router(config-if)# no cable dsg 0020.0020.0020 230.8.8.8 abc
4d17h: DSG: interface Cable5/0 left the igmp static group 230.8.8.8.
Cisco Broadband Cable Command Reference Guide
2-68
You cannot create use the same IP multicast groups for both DSG traffic and for other IP multicast
traffic. If an IP multicast group is being used for DSG traffic, do not use the ip igmp static-group
command to manually configure that same IP multicast group for other, non-DSG traffic.
Different CA vendors cannot share IP multicast addresses. Each vendor must use a unique set of IP
multicast addresses, and after an IP multicast address is assigned to a DSG tunnel, that same address
cannot be used for any other purpose. However, all other multicast addresses and groups can still be
used on the interface for other multicast applications.
DSG-related IP unicast traffic is not supported. The CMTS receives the unicast traffic from the DSG
network controllers, but it does not forward that traffic to the set-top boxes.
DSG traffic should be less than 2.048 Mbps per vendor, so as to conform to the DSG specifications.
DSG does not support BPI-encrypted IP multicast streams.
Chapter 2
Cisco CMTS Configuration Commands
OL-1581-08
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