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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.

Fabric Device Management Interface (FDMI) provides a means to gather and 
display device information from the fabric, and allows FDMI capable devices to 
register certain information with the fabric, if FDMI is enabled. SANsurfer Switch 
Manager will report any and all FDMI information reported by the entry switch, if 
FDMI is enabled on the entry switch. To view FDMI data, FDMI must be enabled 
on the entry switch and on all other switches in the fabric which are to report FDMI 
data.

FDMI is comprised of the fabric-to-device interface and the application-to-fabric 
interface. The fabric-to-device interface enables a device’s management 
information to be registered. The application-to-fabric interface provides the 
framework by which an application obtains device information from the fabric. Use 
the FDMI HBA Entry Limit field on the Switch Properties dialog to configure the 
maximum number of HBAs that can be registered with a switch. If the number of 
HBAs exceeds the maximum number, the FDMI information for those HBAs can 
not be registered. 

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.