Dell Brocade 6520 Command Reference Supporting Fabric OS v7.1.0 - Page 715

portCfgLongDistance 2 distance_level Specifies the long distance level as one of the following (the numerical value representing each distance_level is shown in parentheses): L0 (0) Specifies L0 to configure the port as a regular port. A total of 20 full-size frame buffers are reserved for data traffic, regardless of the port's operating speed; therefore, the maximum supported link distance is up to 5 km at 2 Gbps, up to 2 km at 4 Gbps and up to 1 km at 8, 10, and 16 Gbps. LE (3) Specifies LE mode to configure an E_Ports distance greater than 5 km and up to 10 km. A total of 5, 10, 20, 40, 50, and 80 full-size frame buffers are reserved for data traffic at port speeds of 1 Gbps, 2 Gbps, 4 Gbps, 8, 10, and 16 Gbps. LE does not require an Extended Fabrics license. If a port in LE mode is set to autonegotiation, it will reserve the buffers for the highest support speed on that port. If this is not the desired buffer allocation, you should set the port to a fixed speed. LD (5) Specifies LD for automatic long-distance configuration. The buffer credits for the given E_Port are automatically configured based on the actual link distance. Up to a total of 1452 full-size frame buffers are reserved depending on the distance measured during E_Port initialization. If a value for desired_distance is specified, it is used as the upper limit to the measured distance. If a port in LD mode is set to autonegotiation, it will reserve the buffers for the highest support speed on that port. If this is not the desired buffer allocation, you should set the port to a fixed speed. LS (6) Specifies LS mode to configure a static long distance link with a fixed buffer allocation greater than 10 km. Up to a total of 1452 full-size frame buffers are reserved for data traffic, depending on the specified desired_distance value. If a port in LS mode is set to autonegotiation, it will reserve the buffers for the highest support speed on that port. If this is not the desired buffer allocation, you should set the port to a fixed speed. vc_translation_link_init Specifies the fill words used on long distance links. When set to 1, the link uses ARB fill words (default). When set to 0, the link uses IDLE fill words. The IDLE fill word option is not compatible with QoS configured links and Credit Recovery enabled links. You must disable these features before configuring long distance IDLE fill words. -distance distance This parameter is required when a port is configured as an LD or an LS mode link. In LD mode, the value of desired_distance is the upper limit of the link distance and is used to calculate buffer availability for other ports in the same port group. When the measured distance exceeds the value of distance, this value is used to allocate the buffers. In this case, the port operates in degraded mode instead of being disabled due to insufficient buffers. In LS mode, the actual link distance is not measured, instead the distance is used to allocate the buffers required for the port. -framesize frame_size Specifies the average frame size for LD and LS Mode. -buffer buffers Specifies the desired buffer for LD and LS mode. -fcenable Enables Forward Error Correction on supported ports Fabric OS Command Reference 687 53-1002746-01