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I.4.2
Multicast Routing Mode
Multicast Routing Mode, available when the optional IP Packet Processor is installed and
enabled, establishes communications via one single source (referred to as the Multicast Sender)
and routes to many groups of destination nodes (referred to as Multicast Receivers). Typical
multicast applications include multimedia conferencing, online training, news, etc. Figure I-11
depicts the schematic for a Multicast Routing Network.
As shown in Figure I-11, there are two key components to this configuration – the LAN
Downstream Interface, and the WAN Upstream Interface. Note the following:
•
LAN Downstream Interface – the LAN Downstream Interface is the interface to which
multicast packets arriving at the upstream interface are forwarded if a multicast group has
at least one listener.
The LAN interfaces are configured as Downstream Interface and the
IGMP server is enabled by default.
•
WAN Upstream Interface – the WAN Upstream Interface is where all multicast packets
are forwarded to the uplink interface if the multicast routing exists in the Routing table.
The WAN interface is configured as Upstream Interface by default.
Appendix I
Figure I-11. Multicast Routing Diagram
I–12
CDM-425 Advanced Satellite Modem
MN-CDM-425
Revision 0
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