ZyXEL Communications 2108 Series Manual

Multicast VLAN Registration
(MVR)
Ethernet Switch
Support Notes
Version 3.70
August 2006

MVR Support Note
2
Overview of MVR
MVR refers to Multicast VLAN Registration that enables a media server to
transmit multicast stream in a single multicast VLAN while clients receiving
multicast VLAN stream can reside in different VLANs. Clients in different
VLANs intend to join or leave the multicast group simply by sending the IGMP
Join/leave message to a receiver port. The receiver port belonging to one of
the multicast groups can receive multicast stream from media server. In the
Figure 1, without support of MVR, the Multicast stream from media server and
subscriber must reside in the same VLAN. For each VLAN, A media server is
required to transmit multicast stream once and totally, media server transmits 6
times. In the Figure 2, on the contrary, with MVR, a media server is required to
transmit multicast traffic once to all the clients in different VLANs.
Figure 1
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MVR Support Note
3
Figure 2
MVR Mode
Dynamic Mode
If we select the dynamic mode in MVR setting, IGMP report message
transmitted from the receiver port will be forwarded to a multicast router
through its source port. Multicast router knows which multicast groups exist on
which interface dynamically.
Compatible mode
If we select the dynamic mode in MVR setting, IGMP report message
transmitted from the receiver port will not be transmitted to a multicast router.
Multicast router must be statically configured.
Operation Mode
Join Operation
A subscriber sends an IGMP report message to the switch to join the
appropriate multicast. The next depends on whether the IGMP report
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MVR Support Note
4
matches the switch configured multicast MAC address. If it matches,
the switch CPU modifies the hardware address table to include this
receiver port and VLAN as a forwarding destination of MVLAN.
Leave Operation
Subscriber sends an IGMP leave message to the switch to leave the
multicast. The switch CPU sends an IGMP group-specific query
through the receiver port VLAN. If there is another subscriber in the
VLAN, subscriber must respond within the max response time. If
there is no subscriber, the switch would eliminate this receiver port.
Immediate Leave Operation
Subscriber sends an IGMP leave message to the switch to leave the
multicast. Subscribers do not need to wait for the switch CPU to send
an IGMP group-specific query through the receiver port VLAN. The
switch will immediately eliminate this receiver port.
All contents copyright (c) 2006 ZyXEL Communications Corporation.

MVR Support Note
5
Scenario of MVR
In the following section, we will provide an example to illustrate how to
configure MVR. In this scenario, the media stream from the media servers will
be transmitted from port 24 of GS-4024 (an IGMP Router) to ES-3124 (L2
edge Switch) and GS-4012F (working as L2 edge Switch). On switches
ES-3124 and GS4012F, we enabled the MVR function to allocate the multicast
traffic from GS-4024 to separate VLAN hosts located on ES-3124 and
GS-4012F. Moreover, we created a dummy ip interface for the multicast VLAN
(VLAN100) on GS-4024. VLAN100 will be the Multicast VLAN in this scenario.
Illustration of this scenario
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MVR Support Note
6
Configuration via Web L3 Switch [GS-4024]
1. First of all, we need to create all those IP domains on the GS-4024 Switch.
Once we completed creating those VLANs, our VLAN status should look
the same as the one on the figure below.
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MVR Support Note
7
2. The related PVID settings are shown below.
3. After creating the VLAN, you should add the IP domains to the related
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MVR Support Note
8
VLANs.
4. Since this GS-4024 works as an IGMP Router, you need to enable IGMP
V2 on the multicast ip interface (which is the dummy interface). Please note
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MVR Support Note
9
that since GS-4024 works as an IGMP Router here, you cannot enable
IGMP Snooping at the same time because IGMP Snooping is an L2
feature.
Now we have done everything we needed to do on the IGMP Router
<GS-4024>.
All contents copyright (c) 2006 ZyXEL Communications Corporation.

MVR Support Note
10
Configuration via Web on L2 Switch [ES-3124]
1. At the very beginning, we should create our MVR VLAN First (which is
VLAN100). We will create this multicast VLAN in another way. First, access
the GUI of your Switch. Then click “Advanced Application” on the left and
choose “Multicast”. Finally, in the right frame, click Multicast Setting >
MVR to setup your Multicast VLAN.
2. Name this Multicast VLAN and assign it a VLAN ID. Activate this VLAN;
Pick port 1, 2 and 27 as the receiver ports and port 28 as the Source Port.
In this scenario, we need to make the source ports retain the VLAN “tag”.
Thus, we carry out the following setting. Click “add” to create this VLAN.
When the VLAN is set, click “Group Configuration” in the upper right corner
to start creating our Multicast Groups.
All contents copyright (c) 2006 ZyXEL Communications Corporation.