Moxa Technologies PT-7828 Series, Руководство пользователя

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PT-7828 User’s Manual Featured Functions
3-53
Network without multicast filtering
LNK/ACT SPEED FDX/HDX
FAULT MASTER COUPLER
STAT PWR1 PWR2
RING PORT
COUPLER
PORT
MODE
3 7
4 8 2 6
1 5
3 7
4 8 2 6
1 5
4 3 2 1
3 7
4 8 2 6
1 5
M1
M2
M3
M4
LNK/ACT SPEED FDX/HDX
FAULT MASTER COUPLER
STAT PWR1 PWR2
RING PORT
COUPLER
PORT
MODE
3 7
4 8 2 6
1 5
3 7
4 8 2 6
1 5
4 3 2 1
3 7
4 8 2 6
1 5
M1
M2
M3
M4
1
2
3
4
5
6
7
8
M3
PT-7728
M4
1
2
3
4
4
1
3
2
1 3 5
2 4 6 M1
TX RX TX RX TX RX
2 4 6
1 3 5
M2
TX RX TX RX TX RX
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
LNK/ACT SPEED FDX/HDX
FAULT MASTER COUPLER
STAT PWR1 PWR2
RING PORT
COUPLER
PORT
MODE
3 7
4 8 2 6
1 5
3 7
4 8 2 6
1 5
4 3 2 1
3 7
4 8 2 6
1 5
M1
M2
M3
M4
LNK/ACT SPEED FDX/HDX
FAULT MASTER COUPLER
STAT PWR1 PWR2
RING PORT
COUPLER
PORT
MODE
3 7
4 8 2 6
1 5
3 7
4 8 2 6
1 5
4 3 2 1
3 7
4 8 2 6
1 5
M1
M2
M3
M4
1
2
3
4
5
6
7
8 M3
PT-7728
M4
1
2
3
4
4
1
3
2
1 3 5
2 4 6 M1
TX RX TX RX TX RX
2 4 6
1 3 5
M2
TX RX TX RX TX RX
Hosts only receive dedicated traffic from other hosts belonging to the same group.
Multicast Filtering and Moxa PowerTrans Switch
The PT-7828 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.