HP A7533A HP StorageWorks Fabric OS 6.x administrator guide (5697-0015, May 20 - Page 369
Configuring an extended ISL
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Long distance link initialization activation VC translation link initialization (vc_translation_link_init), a parameter of the portCfgLongDistance command, is enabled by default for long-distance links. To avoid inconsistency in the fabric, make sure that this parameter is enabled on both ends of the link by entering the portCfgLongDistance --vc_translation_link_init command. Specify 1 to activate long distance link initialization sequence; specify 0 to deactivate this mode. When the command is run without specifying a value, 1 is assigned automatically for the long-distance link in VC_RDY flow control; otherwise, 0 is assigned. For a long-distance link not configured for ISL R_RDY mode, this parameter must be set to 1; otherwise, it must be reset to 0. Extended fabrics device limitations Extended Fabrics is normally not implemented on the following devices. • The 400 Multi-protocol (MP) Router and the FR4-18i blade integrate two Gigabit Ethernet ports and sixteen FC ports. The two Gigabit Ethernet ports provide SAN extension over IP networks using FCIP. • The FC4-16IP blade integrates eight Gigabit Ethernet ports and eight FC ports. It is used to implement the iSCSI Gateway Service. The Gigabit Ethernet ports are used to connect iSCSI initiators, and the FC ports are used to connect to any device. 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. • Use only qualified Brocade SFPs. 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, refer to "Administering ISL Trunking" on page 377. 1. Connect to the switch and log in as admin. 2. Enter the switchDisable command. 3. Enter 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 1000 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 Fabric OS 6.x administrator guide 369