HP StorageWorks 2/16V Brocade Fabric OS Command Reference Manual (53-1000240-0 - Page 484

2 Note: Enter commands in lowercase only; mixed case is for readability. portCfgLongDistance Depending on the switch platform and the frame buffers availability within the port group, the LD or LSlevel 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. desired_distance is a required parameter to configure a port as an LD and LS-mode link. For 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 desired_distance is used to allocate the buffers. In this case, the port operates in degraded mode instead being disabled due to insufficient buffers. For an LS-mode link, the actual distance is not measured, instead the desired_distance is used to calculate the buffers required for the port. Pressing Ctrl-D cancels the configuration update. When a port is configured to be a long-distance port, the output of portShow and switchShow displays the long-distance level. In the portShow output, the long-distance level is indicated as follows: • L0 normal • LE standard