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Chapter 13 DCSCM Configuraion
13.1 DCSCM Introduction
DCSCM（security control multicast）technology includes three respects: multicast
source controllabillity, multicast users controllabillity and the service-priority-oriented
multicast policy.
The DCSCM technology mainly uses the following methods to realize multicast
source controllabillity:
a) On the boundary switch, if configured the source-controlled multicast, only the
muticast data of the specified group sent by specified source can pass.
b) For the RP switch at the PIM-SM core state, REGISTER_STOP will be directly
sent for all the REGISTER information besides than the specified source and
group.Creating list entries is not allowed.（This task is implemented in PIM-SM
module）.
The implementation of DCSCM technology is based on the contro lboer the IGMP
report messages from users, so the controlling modules are IGMP snooping module and
IGMP module. The control logic of it includes the following three methods: control
according to the source VLAN+MAC address of the message, control according to the
source IP address of the message, and control according to the port through which the
message enters.IGMP snooping can use all the three methods while the IGMP, since it is
at layer 3, can only control according to the source IP address of the messgae.
The service-priority-oriented mutilcast policy of DCSCM technology adpots the
following methods：For the multicast data within a limited range, the user-specified priority
is set at the access point, making data be transmitted on TRUNK at a higher priority, and
thus ensuring the data to be transmitted through the whole network at the user-specified
priority.
13.2 DCSCM Configuration
13.2.1 DCSCM Configuration Task List
（1） Configuration of source control
（2） Configuration of destination control
（3） Configuration of multicast policy.
1. Configuration of source control
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