Specifications

166 COMMANDCENTER SECURE GATEWAY ADMINISTRATOR GUIDE
What is Primary/Backup mode?
Primary/Backup mode allows you to use two CC-SG LAN ports to implement network failover
and redundancy. In this mode, only one LAN port is active at a time.
Please refer to
About CC-SG LAN Ports for the locations of the Primary LAN and Secondary
LAN ports on each CC-SG model.
Figure 148 Primary/Backup Network
If the Primary LAN is connected and receiving a Link Integrity signal, CC-SG uses this LAN port
for all communications. If the Primary LAN loses Link Integrity, and Secondary LAN is
connected, CC-SG will failover its assigned IP address to the Secondary LAN. The Secondary
LAN will be used until the Primary LAN returns to service. When the Primary LAN is back in
service, CC-SG automatically reverts to using the Primary LAN.
As long as one LAN connection is viable, a client should not notice any disruption in service
during a failure.
Setup for Primary/Backup mode
When implementing Primary/Backup mode for your CC-SG network:
• Both CC-SG LAN ports must be attached to the same LAN sub-network.
• (Optional) You can attach each LAN port to a different switch or hub on the same
subnetwork for reliability.