ZyXEL Communications MES-2110 manual Types of MVR Ports, MVR Modes, How MVR Works 128

Chapter 17 IGMP

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 MES-2110 and S.

Figure 57 MVR Network Example

17.4.1 Types of MVR Ports

In MVR, a source port is a port on the MES-2110 that can send and receive multicast traffic in a multicast VLAN while a receiver port can only receive multicast traffic. Once configured, the MES-2110 maintains a forwarding table that matches the multicast stream to the associated multicast group.

17.4.2 MVR Modes

You can set your MES-2110 to operate in either dynamic or compatible mode.

In dynamic mode, the MES-2110 sends IGMP leave and join reports 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 MES-2110 does not send any IGMP reports. In this case, you must manually configure the forwarding settings on the multicast devices in the multicast VLAN.

17.4.3 How MVR Works

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The following figure shows a multicast television example where a subscriber device (such as a computer) in VLAN 1 receives multicast traffic from the streaming media server, S, via the MES-2110. Multiple subscriber devices can connect through a port configured as the receiver on the MES-2110.

When the subscriber selects a television channel, computer A sends an IGMP report to the MES-2110 to join the appropriate multicast group. If the IGMP report matches one of the configured MVR multicast group addresses on the MES-2110,

MES-2110 User’s Guide