Comnet CWGE24MS2 Installation And Operation Manual page 83

INSTALLATION AND OPERATION MANUAL
MVR
Introduction
MVR refers to Multicast VLAN Registration that enables a media server to transmit multicast
stream in a single multicast VLAN while clients receiving multicast VLAN stream can reside in
different VLANs. Clients in different VLANs intend to join or leave the multicast group simply by
sending the IGMP Join/leave message to a receiver port. The receiver port belonging to one of
the multicast groups can receive multicast stream from media server. Without support of MVR, the
Multicast stream from media server and subscriber must reside in the same VLAN.
» Source ports : The Stream source ports.
» Receiver ports : The Client ports.
» Tagged ports : Configure the tagged ports for source ports or receiver ports.
MVR Mode
» Dynamic Mode:
If we select the dynamic mode in MVR setting, IGMP report message transmitted from the
receiver port will be forwarded to a multicast router through its source port. Multicast router
knows which multicast groups exist on which interface dynamically.
» Compatible mode:
If we select the dynamic mode in MVR setting, IGMP report message transmitted from the
receiver port will not be transmitted to a multicast router.
Operation Mode
» Join Operation:
A subscriber sends an IGMP report message to the switch to join the appropriate multicast.
The next depends on whether the IGMP report matches the switch configured multicast MAC
address. If it matches, the switch CPU modifies the hardware address table to include this
receiver port and VLAN as a forwarding destination of MVLAN.
» Leave Operation:
Subscriber sends an IGMP leave message to the switch to leave the multicast. The switch
CPU sends an IGMP group-specific query through the receiver port VLAN. If there is another
subscriber in the VLAN, subscriber must respond within the max response time. If there is no
subscriber, the switch would eliminate this receiver port.
» Immediate Leave Operation:
Subscriber sends an IGMP leave message to the switch to leave the multicast. Subscribers do not
need to wait for the switch CPU to send an IGMP group-specific query through the receiver port
VLAN. The switch will immediately eliminate this receiver port.
TECH SUPPORT: 1.888.678.9427
CWGE24MS2
INS_CWGE24MS2_REV–
10/05/16 PAGE 83