HP StorageWorks 4/256 Brocade Fabric OS Command Reference Manual - Supporting - Page 495
portCfgLongDistance, Extended Fabrics license.
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portCfgLongDistance 2 portCfgLongDistance Configures a port to support long-distance links. Synopsis portcfglongdistance [slotnumber/]portnumber [distance_level][vc_translation_link_init] [desired_distance] 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 be used only as an E_Port. This configuration can be cleared but not set on VE/VEX_Ports. Changes made by this command are persistent across switch reboots or power cycles. This command requires a Brocade Extended Fabrics license. The value of distance_level can be one of the following (the numerical value representing each distance_level is shown in parentheses): L0 (0) Specify L0 to configure 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; therefore, the maximum supported link distance is 10 Km, 5 Km, or 2.5 Km for the port at speeds of 1 Gbit/sec, 2 Gbit/sec, or 4 Gbit/sec, respectively. LE (3) Specify LE mode is for E_Ports for distances beyond 5 Km and up to 10 Km. A total of 5, 10, or 20 full-size frame buffers are reserved for port speeds of 1 Gbit/sec, 2 Gbit/sec, or 4 Gbit/sec, respectively. 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 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. LS (6) Specify LS mode to configure a long-distance link with a fixed buffer allocation.. Up to a total of 250 full-size frame buffers are reserved for data traffic, depending on the desired distance value provided with the portCfgLongDistance command. For Bloom1-based systems, the number of frame buffers is limited to 63. Depending on the switch platform and the frame buffers availability within the port group, the LD or LS-level links can operate up to distances of 500 Km, 250 Km, or 125 Km at the fixed speed of 1 Gbit/sec, 2 Gbit/sec, or 4 Gbit/sec, respectively. (On some older switch platforms, the LD mode link can operate up to distances of 200 Km and 100 Km at the fixed speeds of 1 Gbit/sec and 2 Gbit/sec, respectively.) A long-distance link also can be configured to be 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. The vc_translation_link_init option enables the long-distance link initialization sequence. It must be set to 1 for a long-distance link not configured for ISL R_RDY mode; otherwise, it must be reset to 0. Fabric OS Command Reference Manual 463 53-1000436-01