HP StorageWorks 2/64 HP StorageWorks Fabric OS 5.x Command Reference Guide (AA - Page 453

portCfgLongDistance Configures a port to support long-distance links. Synopsis portcfglongdistance [slotnumber/]portnumber [ distance_level] [vc_translation_link_init] [desired_distance] Availability admin NOTE: This command requires an HP Extended Fabrics license. Description Use this command to allocate enough full-size frame buffers on a particular port to support a long-distance link up to 500 km. The port can only be used as an F/FL/E_Port. F/FL_Ports can be configured only for long distance using LE, L0.5, L1, or L2 modes. Changes made by this command are persistent across switch reboots or power cycles. The value of distance_level can be one of the following (the numerical value representing each distance_level is shown in parentheses): L0 (0) L0.5 L1 (1) L2 (2) LE (3) LD Reconfigure the port to be a regular switch port. A total of 20 full-size frame buffers are reserved for data traffic, regardless of the port's operating speed. Level 0.5 (portCfgShow displays the two-letter code as LM) long distance, up to 25 km. Level 1 long distance, up to 50 km. Level 2 long distance, up to 100 km. For previously released switches (Bloom1-based), the number of frames buffers is limited to 63. Level E mode is for E_Ports for distances beyond 5 km and up to 10 km. LE does not require an Extended Fabrics license. 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 250 full-size frame buffers are reserved, depending upon the distance measured during E_Port initialization. If the desired distance is provided, it is used as the upper limit to the measured distance. For Bloom1-based systems, the number of frame buffers is limited to 63. You can also configure a long-distance link as part of a trunk group (see portCfgTrunkPort). Two or more long-distance links in a port group forms a trunk group when they are configured for the same speed, the same distance level, and their link distances are nearly equal. For details about buffer allocation at specific speeds and distances, see the HP StorageWorks Fabric OS 5.x command reference guide. The vc_translation_link_init option is used to enable the long-distance link initialization sequence. desired_distance is a required parameter to configure a port as an LD-mode link. The desired distance is used as the upper limit of the link distance to calculate buffer availability for other ports in the same port group. When the measured distance is more than desired_distance, the Fabric OS 5.x command reference guide 453