Manual

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29.5 IPv6 DCSCM
29.5.1 Introduction to IPv6 DCSCM
The technology of IPv6 DCSCM (Destination Control and Source Control Multicast) includes
three aspects: the multicast source control, the multicast user control and the service-priority-
oriented policy multicast.
IPv6 DCSCM Controllable Multicast technology proceeds as the following way:
1. If source controlled multicast is configured on the edge switches, only the multicast data of
the specified group from the specified source can pass.
2. The RP switches which are the core of PIM-SM will directly send REGISTER_STOP as
response to the REGISTER messages not from the specified source and specified group, and
no entry is allowed to be created. (This task is implemented in the PIM-SM module).
The control of multicast users of IPv6 DCSCM technology is implemented on the basis of
controlling the MLD message sent from the users, so the control module is MLD snooping and
the MLD module, the control logic of which includes the following three methods: controlling
according to the VLAN+MAC sending the message, controlling according to the IP address
sending the message, and controlling according to the input port of the message. MLD
snooping can adopts all the three methods at the same time, while the MLD module, at the
third layer, can only control the IP address sending the message.
The service-priority-oriented policy multicast of IPv6 DCSCM technology adopts the following
method: for the confined multicast data, the user-specified priority will be set at the access
point, enabling the data can be sent at a higher priority through TRUNK, and guaranteeing that
the data can be sent through the whole net at the user-specified priority.
29.5.2 IPv6 DCSCM Configuration Task Sequence
The source control configuration
The destination control configuration
The multicast policy configuration
The source control configuration
The source control configuration has three steps, first is globally enabling the source control,
the following is the command of globally enabling the source control:
Command
Explanation
Global Configuration Mode
ipv6 multicast source-control(necessary)
no ipv6 multicast source-control
Globally enable the source control, the no
operation of this command will globally disable
the source control. What should be paid
attention to is that, once globally enable the
source control, all the multicast messages will