2–Planning
Multiple Chassis Fabrics
59265-02 B 2-7
Domain ID, Principal Priority, and Domain ID Lock
The following switch configuration settings affect multiple chassis fabrics:
Domain ID
Principal priority
Domain ID lock
The domain ID is a unique number (1–239) that identifies each switch in a fabric.
The principal priority is a number (1–255) that determines the principal switch,
which manages domain ID assignments for the fabric. The switch with the highest
principal priority (1 is high, 255 is low) becomes the principal switch. If the
principal priority is the same for all switches in a fabric, the switch with the lowest
WWN becomes the principal switch.
The domain ID lock allows (false) or prevents (true) the reassignment of the
domain ID on that switch. Switches come from the factory with the domain ID set
to 1, the domain ID lock set to False, and the principal priority set to 254. For
information about changing the default domain ID, domain ID lock, and principal
priority parameters, refer to the Set Config Switch command in the QLogic 5800V
Series Fibre Channel Switch Command Line Interface Guide.
If you connect a new switch (with its domain ID unlocked) to an existing fabric, and
a domain ID conflict occurs, the new switch will become isolated as a separate
fabric. However, you can remedy this by resetting the new switch or taking it
offline then putting it back online. The principal switch reassigns 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/port number pair or Fibre Channel address. You must reconfigure zones
that are affected by domain ID reassignment. To prevent zoning definitions
from becoming invalid under these conditions, lock the domain IDs. Domain
ID reassignment has no effect on zone members defined by WWN.
