ZyXEL Communications Dimension ES-3148, User Manual

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Dimension ES-3148 User’s Guide
Chapter 23 Multicast 167
23.5.3 How MVR Works
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
switch. Multiple subscriber devices can connect through a port configured as the receiver on
the switch.
When the subscriber selects a television channel, computer A sends an IGMP report to the
switch to join the appropriate multicast group. If the IGMP report matches one of the
configured MVR multicast group addresses on the switch, an entry is created in the forwarding
table on the switch. This maps the subscriber VLAN to the list of forwarding destinations for
the specified multicast traffic.
When the subscriber changes the channel or turns off the computer, an IGMP leave message is
sent to the switch
to leave the multicast group. The switch sends a query to VLAN 1 on the
receiver port (in this case, a DSL port on the switch). If there is another subscriber device
connected to this port in the same subscriber VLAN, the receiving port will still be on the list
of forwarding destination for the multicast traffic. Otherwise, the switch removes the receiver
port from the forwarding table.
Figure 80 MVR Multicast Television Example
23.6 General MVR Configuration
Use the MVR screen to create multicast VLANs and select the receiver port(s) and a source
port for each multicast VLAN. Click Advanced Applications and Multicast in the navigation
panel. Click the Multicast Setting link and then the MVR link to display the screen as shown
next.
Note: You can create up to three multicast VLANs and up to 256 multicast rules on
the switch.
Your switch automatically creates a static VLAN (with the same VID) when you
create a multicast VLAN in this screen.