User`s manual

Moxa VPort 26A-1MP System Configuration
4-18
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
The network WITH Multicast
NOTE
The VPort 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
EtherDeviceTM series Industrial Ethernet Swit
ch user’s manual.
Configuring Multicast Settings
Setting Description Default
Multicast group
address
Multicast Group address for sending video stream. 239.127.0.100
Multicast video port Video port number. Stream 1: 5556
Stream 2: 5560
Multicast audio port Audio port number. Stream 1: 5558
Stream 2: 5562
Multicast TTL Multicast-TTL (Time-to-live) threshold. There is a certain TTL
threshold defined for each network interface or tunnel. A
multicast packet’s TTL must be larger than the defined TTL f
or
that packet to be forwarded across that link.
128
Continuous Multicast
Push
Enable PUSH control of the multicast video stream Disable