General Configuration Guidelines For Mvr; Igmp Snooping - AMX NXA-ENET8-2POE Operation/Reference Manual

Configuring the NXA-ENET8-2POE
This protocol can significantly reduce to processing overhead required to dynamically monitor and establish
the distribution tree for a normal multicast VLAN. This makes it possible to support common multicast
services over a wide part of the network without having to use any multicast routing protocol.
MVR maintains the user isolation and data security provided by VLAN segregation by passing only multicast
traffic into other VLANs to which the subscribers belong. Even though common multicast streams are passed
onto different VLAN groups from the MVR VLAN, users in different IEEE 802.1Q or private VLANs cannot
exchange any information (except through upper-level routing services).
FIG. 75 MVR Concept

General Configuration Guidelines for MVR

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1.
Click Configuration, MVR.
2.
Enable MVR globally on the switch, and select the MVR VLAN.
3.
Set each port that will participate in the MVR protocol as a source port or receiver port, and optionally
enable Immediate Leave on any receiver port to which only one subscriber is attached.
4.
Click Save.

IGMP Snooping

Multicasting is used to support real-time applications such as video conferencing or streaming audio. A
multicast server does not have to establish a separate connection with each client. It merely broadcasts its
service to the network, and any hosts that want to receive the multicast register with their local multicast
switch/router. Although this approach reduces the network overhead required by a multicast server, the
broadcast traffic must be carefully pruned at every multicast switch/router it passes through to ensure that
traffic is only passed on to the hosts which subscribed to this service.
This switch can use Internet Group Management Protocol (IGMP) to filter multicast traffic. IGMP Snooping
can be used to passively monitor or snoop on exchanges between attached hosts and an IGMP-enabled device,
most commonly a multicast router. In this way, the switch can discover the ports that want to join a multicast
group, and set its filters accordingly.
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Enable MVR globally on the switch, and select the MVR VLAN.
Set the interfaces that will join the MVR as source ports or receiver ports.
If you are sure that only one subscriber attached to an interface is receiving multicast services, you
can enable the immediate leave function.
Although MVR operates on the underlying mechanism of IGMP snooping, the two features operate
independently of each other. One can be enabled or disabled without affecting the behavior of the
other. However, if IGMP snooping and MVR are both enabled, MVR reacts only to join and leave
messages from multicast groups configured under MVR. Join and leave messages from all other
multicast groups are managed by IGMP snooping. Also, note that only IGMP version 2 or 3 hosts
can issue multicast leave messages. Immediate leave therefore cannot be used for IGMP version 1
clients.
NXA-ENET8-2POE Gigabit Ethernet Layer 2 PoE Switch