Networking Loops In Router Mode (With Ip Packet Processor); Figure 16-7. Point-To-Point Configuration In "Router Multipoint Hub" Working Mode - Comtech EF Data CDM-625 Installation And Operation Manual

Advanced satellite modem (18 kbps – 25 mbps)

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CDM-625 Advanced Satellite Modem

Ethernet Network Configuration

16.2.3.2 Networking Loops in Router Mode (with IP Packet Processor)

In a network where more than one CDM-625's working mode is set to "Router Multipoint Hub",

care must be taken in route table configuration to avoid Ethernet Networking Loops. Figure 16-7

shows Point-to-Multipoint configuration using the optional IP Packet Processor.

When a CDM-625's working mode is configured as "Router Multipoint Hub", the modem is

allowed to egress on the WAN interface the same packet as was originally ingressed from the

WAN interface. This is necessary to allow the Point-to-Multipoint configuration.

However, configuring more than one modem as a Router Hub across the WAN Interface, then

adding default routes on either side – or any other invalid routes – will cause the same packet to

ping-pong between these two modems until TTL times out.