3Com Switch 8800 Configuration Guide Chapter 26 Common Multicast Configuration
26-3
26.3 Controlled Multicast Configuration 26.3.1 Controlled Multicast Overview
The controlled multicast feature controls user’s authority to join multicast groups. This
feature is based on ports: users must first pass the 802.1x authentication set for their
ports. Then they are allowed to join the multicast groups specifically configured for
them but are prohibited from joining the unauthorized multicast groups. This gives you
a way to control users' access to specific multicast groups.
After the distributed multicast is improved, some of the multicast modules operating
previously in centralized mode are migrated to interface boards now. That is, the
interface boards perform part of the multicast operations to reduce the burden of the
main control board and the operation results are synchronized to the main control
board. To control users' access to specific multicast groups in distributed mode, some
of the controlled multicast modules operating previously in centralized mode are
migrated to run in the distributed environment to make the controlled multicast operate
in distributed mode.
If no user interfaces is added, the CLI commands under controlled multicast in
distributed mode are consistent with that in centralized mode.
Prerequisites of multicast authentication:
1) DOT1X is enabled both globally and on ports. Otherwise, when you enable
controlled multicast, all IGMP report messages are legal. Then the system allows
users to join any group and cannot control the access to multicast groups.
2) The controlled multicast is based on port. The DOT1X mode on port must be port
authentication. Otherwise, the system discards all IGMP report messages without
any processing.
26.3.2 Configuring Controlled Multicast
Controlled multicast configuration tasks include:
z Enabling controlled multicast globally
z Configuring multicast address for specific user access
z Displaying the status of online controlled multicast members
z Displaying the debug information about controlled multicast
Perform the following configuration in local user view.
Table 26-5 Configure the controlled multicast
Operation Command
Configure the controlled multicast multicast ip-address
Remove the configuration undo multicast { ip-address | all }