Comtech EF Data CDM-700 - Manual (Page 196)

CDM-700 High Speed Satellite Modem Revision 5
Ethernet Network Configurations MN/CDM700.IOM
14.3.3 Hub-to-Hub with Standard Traffic using Switches
When connecting two or more “hub-sites” where there are multi-paths between each site, care must
be taken to ensure no network loops occur. Figure 14-2 depicts two hub-sites connected with two
or more modems where all the traffic being transmitted and received is on the same LAN/VLAN.
Figure 14-3 shows a simplified version of the Networking Loop. Since there is no router in the
network and all the traffic is destined to the same network, routing loops have been created.
As illustrated, two switches have been connected, each with two or more separate connections.
This is not how the Ethernet switches were designed to be used, and this configuration will cause
a network outage.
Figure 14-2. Networking Loop Example
Figure 14-3. Networking Loop Example (Simplified)
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