HP StorageWorks 1606 Brocade Fabric OS Command Reference v6.3.0 (53-1001337-01 - Page 643

portCfgLongDistance 2 port distance_level Specify the number of the port to be configured relative to its slot for bladed systems. Use switchShow to display a list of valid ports. This operand is required. Specify the long distance level as one of the following (the numerical value representing each distance_level is shown in parentheses): L0 (0) Specify 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 10 km at 1 Gbps, up to 5 km at 2 Gbps, up to 2 km at 4 Gbps and up to 1 km at 8 Gbps. LE (3) Specify LE mode to configure an E_Ports distance greater than 5 km and up to 10 km. A total of 5, 10, 20, or 40 full-size frame buffers are reserved for data traffic at port speeds of 1 Gbps, 2 Gbps, 4 Gbps, or 8 Gbps. LE does not require an Extended Fabrics license. LD (5) Specify 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. Fabric OS v6.1.0 or later supports up to 3000 km at 1 Gbps, up to 1500 km at 2 Gbps, and up to 750 km at 4 Gbps and 8 Gbps on certain platforms. If a value for desired_distance is specified, it is used as the upper limit to the measured distance. LS (6) Specify 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. vc_translation_link_init On switches running Fabric OS v6.2.0 or later, this parameter 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. desired_distance On switches running firmware versions earlier than Fabric OS v6.2.0, this parameter controls the long distance link initialization sequence. Specify 1 to activate the long distance link initialization sequence. Specify 0 to deactivate this mode. This operand is optional. When the command is run without specifying a value, 1 is assigned automatically for a long distance link in VC_RDY flow control. Otherwise, 0 is assigned. For a long-distance link not configured for ISL R_RDY mode, this parameter must be set to 1; otherwise, it must be reset to 0. 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 desired_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 desired_distance is used to allocate the buffers required for the port. Fabric OS Command Reference 613 53-1001337-01