Q-Logic SANBOX2-16 Manuel D’Utilisation

4 – Managing Switches
Configuring a Switch

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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). The maximum number of switches within a fabric is 239 
with each switch having a unique domain ID.

Switches come from the factory with the domain IDs unlocked. 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. Refer to the 

 for information about the Switch keyword and the 

Domain ID Lock and Principal Priority parameters.

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.

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.