4.8.14 MVR
In multicast VLAN networks, subscribers to a multicast group can exist in more than one VLAN. If the
VLAN boundary restrictions in a network consist of Layer 2 switches
Multicast VLAN Registration (MVR) is a protocol for Layer 2 (IP)-networks that enables multicast-traffic
from a source VLAN to be shared with subscriber-VLANs. The alternative would be to use PIM or a
similar protocol to route the traffic through a Layer 3- network, it might be necessary to replicate the
multicast stream to the same group in different subnets, even if they are on the same physical
network. Multicast VLAN Registration (MVR) routes packets received in a multicast source VLAN to
one or more receive VLANs. Clients are in the receive VLANs and the multicast server is in the source
VLAN. Multicast routing has to be disabled when MVR is enabled. Refer to the configuration guide at
Understanding Multicast VLAN Registration for more information on MVR. MVR is typically used for
IPTV-like services and is therefore usually only available on enterprise-level switches. Many
manufacturers provide support for MVR on their high-end switches.
The main reason for using MVR is to save bandwidth by preventing duplicate multicast streams
being sent in the core network, instead the stream(s) are received on the MVR-VLAN and
forwarded to the VLANs where hosts have requested it/them.
This page provides MVR related configuration. The MVR screen in Figure 4-8-17 appears.
Figure 4-8-17: MVR Configuration page screenshot
The page includes the following fields:
Object Description
• MVR Mode
Enable/Disable the Global MVR.
• VLAN ID
Specify the Multicast VLAN ID.
• Mode
Enable MVR on the port.
• Type
Specify the MVR port type on the port.
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