HP SAN manual Domain ID and domain ID lock

Domain ID and domain ID lock

The domain ID is a unique Fibre Channel identifier for the switch. The Fibre Channel address consists of the domain ID, port ID, and the Arbitrated Loop Physical Address (ALPA). Switches come from the factory with the Domain ID Lock setting disabled (False). This means that if there is a domain ID conflict in the fabric, the switch with the highest principal priority, or the principal switch, will reassign any domain ID conflicts and establish the fabric. If you lock the domain ID on a switch and a domain ID conflict occurs, one of the switches will isolate as a separate fabric and the Logged-In LEDs on both switches will flash to show the affected ports. See the Set Config Switch command to change the Domain ID Lock and Principal Priority parameters. Refer to the McDATA 4Gb SAN Switch for HP p-Class BladeSystem command line interface guide for information about the Set Config Switch command and the command line interface.

If you connect a new switch to an existing fabric with its domain ID unlocked, and a domain conflict occurs, the new switch will isolate as a separate fabric. However, you can remedy this by resetting the new switch or taking it offline then back online. The principal switch will reassign the domain ID and the switch will join the fabric.

NOTE: Domain ID reassignment is not reflected in zoning that is defined by domain ID and port number pair. You must reconfigure zones that are affected by domain ID reassignment.

The McDATA 4Gb SAN Switch displays domain IDs differently in Standard mode than other M-series directors and edge switches. When the McDATA 4Gb SAN switch is in Standard mode (default), the domain ID will be displayed differently depending on which management utility is used. The valid Domain ID range while in standard mode (default) is 97—127. McDATA Web Server and CLI will display this as 97—127. HAFM will display this as 1—31.

Prior to changing from Standard mode to McDATA Fabric mode, it is recommended that the switch be isolated from the fabric (take switch offline) before making the configuration changes and all domain IDs in the fabric should be noted to avoid conflicts. Once isolated, using CLI or McDATA Web Server, change interop mode to McDATA Fabric mode, and change the domain ID to a unique ID within the valid range of 1—31 for McDATA Fabric mode. It is then recommended that the Domain ID be locked to prevent conflict within the fabric. When all changes have been made and the switch has been brought back online, it should then be added into the fabric.

In McDATA Fabric mode, the McDATA 4Gb SAN Switch will display the domain IDs the same as other M-series directors and edge switches no matter which management utility is used. The valid domain ID range is 1—31 for McDATA Fabric mode.

Prior to changing from McDATA Fabric mode to Standard mode, it is recommended that the switch be isolated from the fabric (take switch offline) before making the configuration changes and all domain IDs in the fabric should be noted to avoid conflicts. Once isolated, using McDATA Web Server, Element Manager, or the CLI, change interop mode to Standard and change the domain ID to a unique ID within the valid range of 97—127 for standard mode. It is then recommended that the Domain ID be locked to prevent conflict within the fabric. When all changes have been made and the switch has been brought back online, it should then be added into the fabric.

Both Standard Mode and McDATA Fabric Mode permit a maximum of 31 domain IDs. For fabrics in which all other switches support 239 domain IDs, you can extend the valid domain IDs on the McDATA 4Gb SAN Switch to 1-239 by enabling 239 Domain Support. See ”Interop mode” on page 73 for more information.

McDATA® 4Gb SAN Switch for HP p-Class BladeSystem user guide 69