Zyxel OLT2412 [174/326] Types of mvr ports
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Zyxel OLT2412 [174/326] Types of mvr ports

Zyxel OLT2412 [174/326] Types of mvr ports
Chapter 24 Multicast
OLT2412 User’s Guide
174
24.6.1 Types of MVR Ports
In MVR, a source port is a port on the OLT that can send and receive multicast traffic in a multicast
VLAN while a receiver port can only receive multicast traffic. Once configured, the OLT maintains a
forwarding table that matches the multicast stream to the associated multicast group.
24.6.2 MVR Modes
You can set your OLT to operate in either dynamic or compatible mode.
In dynamic mode, the OLT 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 OLT does not send any IGMP reports. In this case, you must manually
configure the forwarding settings on the multicast devices in the multicast VLAN.
24.6.3 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 OLT.
Multiple subscriber devices can connect through a port configured as the receiver on the OLT.
When the subscriber selects a television channel, computer A sends an IGMP report to the OLT to
join the appropriate multicast group. If the IGMP report matches one of the configured MVR
multicast group addresses on the OLT, an entry is created in the forwarding table on the OLT. 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 OLT to leave the multicast group. The OLT sends a query to VLAN 1 on the receiver port (in
this case, an uplink port on the OLT). 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 OLT removes the receiver port from the forwarding table.
Figure 47 MVR Multicast Television Example
24.7 General MVR Configuration
Use the mvr <vid> command to create multicast VLANs and select the receiver port(s) and a
source port for each multicast VLAN. Use the show mvr command to display the settings.
Note: You can create up to five multicast VLANs and up to 256 multicast rules on the OLT.
SMulticast VLAN
VLAN 1
A

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