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4 – Managing Switches
Configuring a Switch
4-20 59226-00 B
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4.7.2.3
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). 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 “Set Config
Command” on page A-40 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.
4.7.2.4
Fabric Device Management Interface
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.
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.