Raritan Engineering Command Center CC-SG - Manual (Page 178)

162 C OMMAND C ENTER S ECURE G ATEWAY A DMINISTRATOR G UIDE
A. Choose Primary/Backup mode to implement network failover and redundancy. In
this mode, only one NIC is active at a given point of time and only one network IP
address assignment is possible.
Figure 193 Primary/Backup Network
Typically, both NICs are attached to the same LAN sub-network, but different
switches (or hubs) may be used for reliability. When both NICs are used, a level of
network redundancy is provided. For example, if LAN1 is connected and is receiving
a Link Integrity signal, CC-SG uses this NIC for all communications. In the event of
a LAN1 failure and assuming LAN2 is connected, CC-SG migrates the assigned
(possibly by DHCP) IP address to LAN2. LAN2 will be used until LAN1 is repaired
and returned to service. When this happens, CC-SG reverts to using LAN1.
As long as one interface is viable, a PC client should not notice any disruption in
service during a failure. CC-SG remains at the same logical IP address, but attempts
to keep communication channels and existing sessions up in the event of possible
network failures. All communication (for example, PC client, Raritan device
management, cluster peer, etc.) is carried over this single communication channel
that is maintained by both NICs.
B. Choose Active/Active mode if you have special network conditions; particularly if
you have two networks where routing may not exist. If network security is important
and if you are using proxy-type deployments, you also should choose this mode.
Figure 194 Active/Active Network