3-24 Windows Setup and OperationDUPLEX LAN CONFIGURATIONThe NEC Express5800/ft series builds a duplex LAN configuration by using “Stratus emb-EB2-Port Gigabit Adapter,” mounted as standard on the CPU/IO module and the extended PCI slot“NEC MT Gigabit Adapter”, “NEC MF Gigabit Adapter,” and “Stratus U 575 Dual Port CopperGigabit Adapter.”OverviewThe duplex LAN configuration is of three types as described below: Adapter Fault Tolerance (AFT)Adapter Fault Tolerance (AFT) is a feature that places more than one LAN controller on thesame LAN (same segment), and automatically switches the process of the primary controller tothe backup controller when any trouble occurred on the primary. Adaptive Load Balancing (ALB)Adaptive Load Balancing (ALB) is a feature that connects more than one LAN controller to thesame hub and enhances the throughput by operating packet transmission from the server.Receive Load Balancing (RLB) is enabled by default. Disable RLB. When RLB is enabledthe network duplex configuration may fail. Switch Fault Tolerance (SFT)Switch Fault Tolerance (SFT) is a feature that provides the network availability because thefail-over target (standby) adapter takes over the MAC address/L3 address when failure occurson adapter/cable/connecting switch, as two adapters are connected to corresponding twoswitches. One is allocated to the primary adapter and the other is allocated to the standbyadapter. On the network, the primary adapter communicates.Regarding the path redundancy, you need to construct the environment both on the ft serverand the switch devices. Spanning Tree Protocol (SPT) function is required to construct the pathredundancy on the switch devices.When you construct the environment, you need to set the switch priority in order to maintainthe path to the primary adapter after the path information is updated if a switch on the path isbroken. In addition, you need to set the priority to use the secondary adapter's switch if theprimary adapter's switch is broken.The other modes, “Static Link Aggregation” and “IEEE 802.3ad Link Aggregation,” do notcontribute to enhancement against a fault. When a fault occurs, the communication performed onthe controller with the fault is not taken over by the backup controller but lost.
