A10E/A28E/A28F Configuration Guide
Currently, the switch supports up to 1024 Layer 2 multicast entries.
5.1.3 MVR
MVR (Multicast VLAN Registration) is multicast constraining mechanism running on Layer
2 devices, used for multicast group management and control and achieve Layer 2 multicast.
MVR adds member interfaces belonging to different user VLANs on the Layer device to
multicast VLAN by configuring multicast VLAN and makes different VLAN user uses one
common multicast VLAN, then the multicast data will be transmitted only in one multicast
VLAN without copying one for each user VLAN, thus saving bandwidth. At the same time,
multicast VLAN and user VLAN are completely isolated which also increases the security.
Both MVR and IGMP Snooping can achieve Layer 2 multicast, but the difference is:
Multicast VLAN in IGMP Snooping is the same with user VLAN, while multicast VLAN in
MVR can be different with user VLAN.
One switch can be configured with up to 10 multicast VLAN, at least one multicast
VLAN and group addresses. It supports up to 1024 multicast groups.
5.1.4 MVR Proxy
MVR Proxy is an MVR protocol proxy mechanism. It runs on Layer 2 devices to assist in
managing and controlling multicast groups. MVR Proxy will terminate IGMP packets; It can
proxy host function and also proxy multicast router functions for the next agent. The Layer 2
network device enabled with MVR Proxy has two roles:
On the user side, it is a query builder and undertakes the role of Server, sending Query
packets and periodically checking user information, and dealing with the Report and
Leave packets from user.
On the network routing side, it is a host and undertakes the role of Client, responding the
multicast router Query packet and sending Report and Leave packets. It sends the user
information to the network when they are in need.
The proxy mechanism can control and access user information effectively, at the same time,
reducing the network side protocol packet and network load.
MVR Proxy establishes the multicast forwarding table by blocking IGMP packets between
users and the multicast router.
MVR Proxy is usually used with MVR.
The following concepts are related to MVR Proxy.
IGMP packet suppression
IGMP packet suppression refers that the Layer 2 device filters identical Report packets. When
receiving Report packets from a multicast group member in a query interval, the Layer 2
device sends the first Report packet to the multicast router only rather than other identical
Report packets, to reduce packet quantity on the network.
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