User`s manual

EDS-P510 Series Featured Functions
3-52
Network without multicast filtering
IGMP Group2
Group 1 Multicast Stream Group 2 Multicast Stream
IGMP Group1 IGMP Group2 IGMP Group1
All hosts receive the multicast traffic, even if they don’t need it.
Network with multicast filtering
IGMP Group2
Group 1 Multicast Stream Group 2 Multicast Stream
IGMP Group1 IGMP Group2 IGMP Group1
PWR1
PWR2
FAULT
7
6
5
4
3
2
1
G1
G2
G1
G3
G2
G3
EDS-P510
MASTER
G3
G2
G1
COUPLER
10/100/1000
7
6
5
4
3
2
1
10/100
EtherDevice Switch
Turbo
Ring
PoE
Hosts only receive dedicated traffic from other hosts belonging to the same group.
Multicast Filtering and Moxa EtherDevice Switch
The EDS-P510 has three ways to achieve multicast filtering: IGMP (Internet Group Management Protocol)
Snooping, GMRP (GARP Multicast Registration Protocol), and adding a static multicast MAC manually to filter
multicast traffic automatically.
IGMP (Internet Group Management Protocol)
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 find those ports that want to
join a multicast group, and then configures its filters accordingly.
Query Mode
Query mode allows the EDS-P510 to work as the Querier if it has the lowest IP address on the subnetwork to
which it belongs. IGMP querying is enabled by default on the EDS-P510 to help prevent interoperability issues
with some multicast routers that may not follow the lowest IP address election method. Enable query mode to
run multicast sessions on a network that does not contain IGMP routers (or queriers).