Multicast Routing Mode; Figure 16-11. Multicast Routing Diagram - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Ethernet Network Configuration
16.4.2

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,
news, etc. Figure 16-11 depicts the schematic for a Multicast Routing Network.
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

The CDM-625 LAN interfaces are configured as Downstream Interface and
the IGMP server is enabled by default.
The CDM-625 WAN interface is configured as Upstream Interface by
default.
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