GLS provides software that uses multiple NICs (Network Interface Card) to achieve redundant line control of network transmission paths to which the system is connected, and so improve the overall reliability of the communication infrastructure.
GLS works by bundling multiple network adapters (physical adapters) together to create a single virtual network adapter (virtual adapter). This virtual adapter duplicates network transmission paths using the method described below.
In NIC switching mode, network transmission paths are duplicated by using exclusively a pair of NICs connected on the same network. This means that you can communicate with any host that is connected to the network as well as with hosts on networks connecting via the router.
Figure 1.1 Duplicate Control by NIC Switching Mode
In NIC switching mode, when one of the transmission paths is operational (available for communication), the other is on standby (ready to be switched to in the event of a line failure).
If communication on the operational transmission path is disrupted for any reason, the connection to the corresponding physical adapter is severed, and communications are switched to the "standby" transmission path, which now becomes "operational".
For details on control measures if a failure occurs, refer to "2.2 Duplicate Control."
