HP StorageWorks 4/256 HP StorageWorks Fabric OS 5.3.x administrator guide (569 - Page 348
platforms, the LD mode link can operate up to distances of 200 Km, Gbps, 2 Gbps, or 4 Gbps
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Where: slotnumber portnumber distance_level Specify the slot number for SAN Director 2/128 and 4/256 SAN Director. This option is not applicable to fixed-port switches. The slot number must be followed by a slash (/) and the port number. Specify the port number. 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 Gbps, 2 Gbps, or 4 Gbps, 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 Gbps, 2 Gbps, or 4 Gbps, 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 2Gb switches, 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 2Gb switches, 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 Gbps, 2 Gbps, or 4 Gbps, 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 Gbps and 2 Gbps, 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. vc_translation_link_init The vc_translation_link_init option enables the long-distance link initialization sequence. This extended link initialization sequence is an enhanced link reset protocol, and avoids excessive resetting of ports. By default this option is set to 1 (enabled). To prevent fabric segmentation, this option must be set to 0 (disabled) when connecting to switches running Fabric OS versions earlier than v3.0.2c or v4.0.2. It must be set to 1 (enabled) when configuring a trunk over extended fabrics. It must be set to 1 for a long-distance link not configured for ISL R_RDY mode; otherwise, it must be reset to 0 360 Administering Extended Fabrics