HP StorageWorks 8/20q Fibre Channel Switch Installation and Reference Guide 21
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 from 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 Worldwide Name
(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, see the set config switch command in the HP StorageWorks 8/20q
Fibre Channel Switch Command Line Interface Guide.
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. You can remedy this by resetting the new switch or
taking it offline then putting it back online. The principal switch will reassign 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.
Common topologies
For additional information about Storage Area Network (SAN) connectivity, see the SAN design reference
guide available at the HP website: http://www.hp.com/go/SANdesignguide
.
Transparent routing
IMPORTANT: The Simple SAN Connection Manager (SSCM) application version 2.10 or later can
manage 8/20q Fibre Channel Switches with active TR_Ports; however, SSCM cannot manage or discover
remote switches or devices in the remote fabric. Use QuickTools or Enterprise Fabric Management Suite
and the storage management interface to present Logical Unit Numbers (LUNs) to remote devices. SSCM
version 2.0 and earlier versions do not support the management of fabrics that include 8/20q Fibre
Channel Switches with active TR_Ports and may disrupt communication between the 8/20q Fibre Channel
Switch and the remote fabric.
\
The transparent routing feature provides inter-fabric routing to allow controlled and limited access between
devices on a 8/20q Fibre Channel Switch (local) fabric and devices on a remote fabric consisting of
B-series or C-series switches. For a list of switches that are supported in a remote fabric, see the HP
StorageWorks 8/20q Fibre Channel Switch release notes, and the HP StorageWorks SAN Design
reference guide located at the HP website: http://www.hp.com/go/sandesignguide
. This type of
inter-fabric connection uses the Fibre Channel industry N-Port ID Virtualization (NPIV), and makes local
and remote devices accessible to each other while maintaining the local and remote fabrics as separate
fabrics.
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