HP StorageWorks 8/80 Brocade Fabric OS Command Reference Guide v6.1.0 (53-1000 - Page 478

2 portCfgLongDistance 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 v6.0 or later supports up to 500 km at 1 Gbps, up to 250 km at 2 Gbps, and up to 100 km at 4 Gbps and 8 Gbps. 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 Specify 1 to activate a long distance link initialization sequence. Specify 0 to deactivate this mode. When the command is run without specifying a value, 1 is assigned automatically for the 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 operand is optional. desired_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 desired_distance, this value is used to allocate the buffers. In this case, the port operates in degraded mode instead 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. Examples To configure a switch port 63 to support a 100 km link and be initialized using the long distance link initialization protocol: switch:admin> portcfglongdistance 4/15 LS 1 100 switch:admin> portshow 4/15 portCFlags: 0x1 portFlags: 0x20001 PRESENT LED portType: 1.1 portState: 2 Offline portPhys: 4 No_Light portScn: 0 portId: 013f00 portWwn: 20:3f:00:60:69:00:02:48 Distance: super long