HP A7533A HP StorageWorks Fabric OS 6.1.1 administrator guide (5697-0235, Dece - Page 365

Configuring an extended ISL Before configuring an extended ISL, ensure that the following conditions are met: • Be sure that the ports on both ends of the ISL are operating at the same port speed, and can be configured at the same distance level without compromising local switch performance. NOTE: A long-distance link also can be configured to be part of a trunk group. Two or more long-distance links in a port group form a trunk group when they are configured for the same speed, the same distance level, and their link distances are nearly equal. For information on trunking concepts and configurations, see "Administering ISL trunking" on page 367. • Use only qualified HP branded SFPs. • For fabrics that contain B-Series 2Gb switches, contact HP support for details on which parameters to set. • For Fabric OS 3.x or 4.x, contact HP for details on which parameters to set. 1. Connect to the switch and log in as admin. 2. Issue the switchDisable command. 3. Issue the configure command to set the switch fabric-wide configurations. You can set the following fabric-wide settings: (* = multiplication symbol) Field Domain R_A_TOV E_D_TOV WAN_TOV MAX_HOPS Type Number Number Number Number Number Default 1 10000 2000 0 7 Range Varies E_D_TOV * 2 to 120000 1000 to R_A_TOV/2 0 to R_A_TOV/4 7 to 19 4. Issue the portCfgLongDistance command, using the following syntax: portcfglongdistance [slotnumber/]portnumber [distance_level] [vc_translation_link_init] [desired_distance] where: • slotnumber (for blades) is the slot number in which the blade is located. The slot number must be followed by a slash (/) and the port number. This option is not used for fixed-port switches. • portnumber is the port number • distance_level is 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. • LE (3) Specify LE mode for distances up to 10 km. • LD (5) Specify LD for automatic long-distance configurations. The buffer credits for the given E_Port are automatically configured, based on the actual link distance measured during E_Port initialization. • LS (6) Specify LS mode to configure a long-distance link with a buffer allocation based on a fixed desired distance value. • vc_translation_link_init 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). 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. Fabric OS 6.1.x administrator guide 365