EDS-510A Series User’s Manual
Featured Functions
3-63
Multicast Filtering
Multicast filtering ensures that only end-stations that have joined certain groups receive multicast
traffic. With multicast filtering, network devices only forward multicast traffic to the ports that are
connected to registered end-stations. The following two figures illustrate how a network behaves
without multicast filtering, and with multicast filtering.
Network without multicast filtering
1
2
3
4
5
6
7
8
Serial ports
Console
LAN
9
10
11
12
13
14
15
16
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
Hosts only receive dedicated traffic from other hosts belonging to the same group.
