Moxa Managed Ethernet Switch (UI_2.0_FW_5.x) User Manual
Multicast Filtering
Multicast f iltering ensures that only end-stations that have joined certain groups receive multicast traf f ic.
With multicast f iltering, network devices only f orward multicast traf f ic to the ports that are connected to
registered end-stations. The f ollowing two f igures illustrate how a network behaves without multicast
f iltering, and with multicast f iltering.
Network without multicast filtering
All hosts receive the multicast
traffic, even if they
don’t need it.
Network with multicast filtering
Hosts only receive dedicated
traffic from other hosts belonging
to the same group.
Multicast Filtering and Moxa’s Industrial Rackmount Switches
There are three ways to achieve multicast filtering with a Moxa switch: IGMP (Internet Group Management
Protocol) Snooping, GMRP (GARP Multicast Registration Protocol), and adding a static multicast MAC
manually to f ilter multicast traf f ic automatically.
Snooping Mode
Snooping Mode allows your switch to forward multicast packets only to the appropriate ports. The switch
snoops on exchanges between hosts and an IGMP device, such as a router, to f ind those ports that want to
join a multicast group, and then conf igures its f ilters accordingly.
Query Mode
Query mode allows the Moxa switch to work as the Querier if it has the lowest IP address on the subnetwork
to which it belongs.
NOTE
IGMP Snooping Enhanced mode is only provided in Layer 2 switches.
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