Chapter 25 Multicast
MGS3520 Series User’s Guide
217
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, an uplink 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 125
MVR Multicast Television Example
25.6 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 Application
>
Multicast >
MVR
to display the screen as
shown next.
Note: You can create up to five multicast VLANs and up to 256 multicast rules on the
Switch.
Note: Your Switch automatically creates a static VLAN (with the same VID) when you
create a multicast VLAN in this screen.
S
Multicast VLAN
VLAN 1
A
