Product Manual – DOC. 8879C DM-NVX-36x(C) Encoders/Decoders • 77
IGMP Snooping
A DM NVX device sends IGMP join and leave messages.
NOTE: DM NVX devices support IGMPv2 and IGMPv3 only. IGMPv1 is not supported.
The IGMP snooping support version (v2 or v3) is configurable in the web interface.
The desired version can be selected under the
Settings tab in the System Setup –
Network Interface section. The default setting is v2.
Settings Tab – System Setup, Network Interface
NOTE: When a different IGMP snooping support version is selected, the DM NVX device
must be rebooted in order for the change to take effect.
The network switch port that connects to a DM NVX device must be enabled with
IGMPv2 or IGMPv3 snooping to prevent the switch from flooding the multicast
destination address traffic to all other connected ports. The multicast destination
address that is configured for the DM NVX device must be within the range of qualified
addresses. An upstream device such as a layer 3 router or switch periodically sends the
IGMP General Query messages to hosts in order to maintain group membership state
information. These queries can be either general or group-specific queries. The host
responds to queries with IGMP membership reports. The host running IGMPv2 or IGMPv3
may also send a Leave Group message to routers or switches in order to withdraw from
the group.
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