ZyXEL Communications 2108 Series Handbuch

Multicast VLAN Registration

(MVR)

Ethernet Switch

Support Notes

Version 3.70

August 2006

MVR Support Note

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

MVR Support Note

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

MVR Support Note

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.

MVR Support Note

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

MVR Support Note

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.

MVR Support Note

2. The related PVID settings are shown below.

3. After creating the VLAN, you should add the IP domains to the related

MVR Support Note

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

MVR Support Note

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>.

MVR Support Note

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.

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