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GS-2024 User’s Guide
130 Chapter 18 Multicast
18.5 MVR Overview
Multicast VLAN Registration (MVR) is designed for applications (such as Media-on-Demand
(MoD)) that use multicast traffic across an Ethernet ring-based service provider network.
MVR allows one single multicast VLAN to be shared among different subscriber VLANs on
the network. While isolated in different subscriber VLANs, connected devices can subscriber
to and unsubscribe from the multicast stream in the multicast VLAN. This improves
bandwidth utilization with reduced multicast traffic in the subscriber VLANs and simplifies
multicast group management.
You must enable IGMP snooping to use MVR. However, MVR only responds to IGMP join
and leave control messages from multicast groups that are configured under MVR. Join and
leave reports from other multicast groups are managed by IGMP snooping.
The following figure shows a network example. The subscriber VLAN (1, 2 and 3)
information is hidden from the streaming media server, S. In addition, the multicast VLAN
information is only visible to the switch and S.
Figure 53 MVR Network Example
18.5.1 Types of MVR Ports
In MVR, a source port is a port on the switch that can send and receive multicast traffic in a
multicast VLAN while a receiver port can only receive multicast data. Once configured, the
switch maintains a forwarding table that matches the multicast stream to the associated
multicast group.
18.5.2 MVR Modes
You can set your switch to operate in either dynamic or compatible mode.
In dynamic mode, the switch sends IGMP leave and join reports through the source port(s) to
the other multicast devices (such as multicast routers or servers) in the multicast VLAN. This
allows the multicast devices to update the multicast forwarding table to forward or not forward
multicast traffic to the receiver ports.
In compatible mode, the switch does not send any IGMP reports through the source port(s). In
this case, you must manually configure the forwarding settings on the multicast devices in the
multicast VLAN.