Configuring Global And Port-Related Settings For Igmp Snooping - AMX NXA-ENET8-2POE Operation/Reference Manual

If there is no multicast router attached to the local subnet, multicast traffic and query messages may not be
received by the switch. In this case (Layer 2) IGMP Query can be used to actively ask the attached hosts if they
want to receive a specific multicast service. IGMP Query thereby identifies the ports containing hosts
requesting to join the service and sends data out to those ports only. It then propagates the service request up to
any neighboring multicast switch/router to ensure that it will continue to receive the multicast service.
The purpose of IP multicast filtering is to optimize a switched network's performance, so multicast packets
will only be forwarded to those ports containing multicast group hosts or multicast routers/switches, instead of
flooding traffic to all ports in the subnet (VLAN).

Configuring Global and Port-related Settings For IGMP Snooping

Use the IGMP Snooping Configuration page to configure global and port-related settings which control the
forwarding of multicast traffic. Based on the IGMP query and report messages, the switch forwards traffic only
to the ports that request multicast traffic. This prevents the switch from broadcasting the traffic to all ports and
possibly disrupting network performance.
FIG. 76 IGMP Snooping Configuration
IGMP Snooping Configuration parameters
Global Configuration
• Snooping Enabled When enabled, the switch will monitor network traffic to determine which hosts
• Unregistered
IPMC Flooding
Enabled
NXA-ENET8-2POE Gigabit Ethernet Layer 2 PoE Switch
want to receive multicast traffic. (Default: Enabled)
This switch can passively snoop on IGMP Query and Report packets transferred
between IP multicast routers/switches and IP multicast host groups to identify the
IP multicast group members. It simply monitors the IGMP packets passing
through it, picks out the group registration information, and configures the multi-
cast filters accordingly.
Floods unregistered multicast traffic into the attached VLAN. (Default: Disabled)
Once the table used to store multicast entries for IGMP snooping is filled, no new
entries are learned. If no router port is configured in the attached VLAN, and
Unregistered IPMC Flooding is disabled, any subsequent multicast traffic not
found in the table is dropped, otherwise it is flooded throughout the VLAN.
Configuring the NXA-ENET8-2POE
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