Domain Id, Principal Priority, And Domain Id Lock - HP McDATA 4Gb SAN Switch Installation Manual

Domain ID, principal priority, and domain ID lock

The following switch configuration settings affect multiple switch fabrics:
•
Domain ID
•
Principal priority
•
Domain ID lock
The domain ID is a unique number that identifies each switch in a fabric. The valid domain ID range
depends on the interoperability mode:
•
When the interoperability mode is Standard, the domain ID can be 97–127.
•
When the interoperability mode is McDATA Fabric Mode, the domain ID can be 1–31.
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–Default) or prevents (True) the reassignment of the domain ID on that
switch. Switches come from the factory with the domain ID set to 97, the domain ID lock set to False, and
the principal priority set to 254. See the McDATA 4Gb SAN Switch for HP p-Class BladeSystem user guide
for information about changing the domain ID and domain ID lock using McDATA Web Server or McDATA
Element Manager. See the Set Config command in the McDATA 4Gb SAN Switch for HP p-Class
BladeSystem user guide for information about changing the default domain ID, domain ID lock, and
principal priority parameters.
An unresolved domain ID conflict means that the switch with the higher WWN will isolate as a separate
fabric, and the Logged-in LEDs will flash green to show the affected ports. If you connect a new switch to
an existing fabric with its domain ID unlocked, and a domain ID 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. It is
recommended to assign sequential domain IDs to switches to avoid domain ID conflicts and to keep port
addressing the same.
NOTE:
Domain ID reassignment is not reflected in zoning that is defined by domain ID/port number pair.
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 using McDATA Web Server, McDATA
Element Manager, or the Set Config command with the Switch operand. HP recommeds defining zone
members by WWN.
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