Comtech EF Data CDM-625A Installation And Operation Manual page 621

CDM-625A Advanced Satellite Modem
Appendix K
K.4.2 Multicast Routing Mode
Multicast Routing Mode, available when the optional IP Packet Processor is installed and
enabled , is where communications is established via one single source (referred to as the
Multicast Sender) and routed to many groups of destination nodes (referred to as Multicast
Receivers). Typical multicast applications include multimedia conferencing, online training,
Figure 16-11
news, etc.
As shown, there are two key components to this configuration – the LAN Downstream
Interface, and the WAN Upstream Interface. Observe 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.
•
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.
Figure 16-11. Multicast Routing Diagram
depicts the schematic for a Multicast Routing Network.
The CDM-625A LAN interfaces are configured as Downstream Interface
and the IGMP server is enabled by default.
The CDM-625A WAN interface is configured as Upstream Interface by
default.
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