Figure 1-6. Cdm-625/750/700/710/710G 1:1 Ip Redundancy Managed Switch Mode - Comtech EF Data CRS-170A Installation And Operation Manual

CRS-170A L-Band 1:1 Redundancy Switch
Introduction
Any new packets arriving destined for that MAC address will be forwarded only out the port
identified in the CAM table. Most switch CAM tables do have a flush or timeout value, but is
normally set to a very high number to limit the amount of times the switch has to broadcast a
packet out all ports. It is also important to note that CAM entries for a specific port are cleared
when a port link goes down.

Figure 1-6. CDM-625/750/700/710/710G 1:1 IP Redundancy Managed Switch Mode

Figure 1‐6 shows a 1:1 IP Redundancy setup in Managed Switch Mode, with the Ethernet data
interface of both CEFD modems connected to a Layer 2 Switch. Both modems are operational –
Modem 'A' is Online and connected to Port 4 of the Layer 2 Switch. Modem 'B' is Offline and
connected to Port 3 of the Layer 2 Switch, but the Ethernet link is not active because only the
Online modem will have an active Ethernet data interface. Also, Local PC 'A' is connected to Port
1 of the Layer 2 Switch.
When Ethernet traffic is sent from Local PC 'A' across the satellite link to remote PC 'B', the
Layer 2 Switch will "learn" the MAC addresses of both PCs and will have these dynamic entries in
its CAM Table:
CDM-625/750/700/710/710G
CDM-625/750/700/710/710G
Port 1 MAC 00‐00‐00‐00‐00‐11 (Local PC 'A')
Port 3 No entries, port down
Port 4 MAC 00‐00‐00‐00‐00‐22 (Remote PC 'B')
CDM-625/750//700/710/710G
1–10
Revision 9
MN/CRS170A.IOM