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Moxa VPORT 254-M-SC-T Manual do Utilizador Página 62

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VPort 254 User’s Manual System Configuration
4-18
y Works with other IP protocols and services, such as Quality of Service (QoS).
y There are situations where a multicast approach is more logical and efficient than a unicast
approach. A typical use of multicasts is in video-conferencing, in which high volumes of
traffic need to be sent to several end-stations simultaneously, but for which broadcasting that
traffic to all end-stations would seriously reduce network performance. Besides, several
industrial automation protocols, such as Allen-Bradley, EtherNet/IP, Siemens Profibus, and
Foundation Fieldbus HSE (High Speed Ethernet), use the multicast approach. These industrial
Ethernet protocols use publisher/subscriber communications models by multicasting packets
that could flood a network with heavy traffic. IGMP provides the ability to prune multicast
traffic so that it travels only to those end destinations that require the traffic, thus reducing the
amount of traffic on the Ethernet LAN.
The network WITHOUT Multicast
Group 2
Group 2
Group 1
Group 1
Video Stream Group 2
Video Stream Group 1
Group 2
Group 2
Group 1
Group 1
Group 2Group 2
Group 2Group 2
Group 1Group 1
Group 1Group 1
Video Stream Group 2Video Stream Group 2
Video Stream Group 1Video Stream Group 1
The network WITH Multicast
Group 1 Multicast Stream
Group 2 Multicast Stream
IGMP Group 2
IGMP Group 2
IGMP Group 1
IGMP Group 1
Group 1 Multicast StreamGroup 1 Multicast Stream
Group 2 Multicast StreamGroup 2 Multicast Stream
IGMP Group 2
IGMP Group 2
IGMP Group 2
IGMP Group 2
IGMP Group 1
IGMP Group 1
IGMP Group 1
IGMP Group 1
NOTE
The VPort 254 is the source that delivers the multicast video stream. To benefit from the
Multicast protocol, the gateway or network switch should support the multicast filtering function
(such as IGMP Snooping) so that the multicast stream is delivered correctly and precisely. To
learn more about IGMP Snooping, refer to the Moxa EtherDevice
TM
series Industrial Ethernet
Switch user’s manual.
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