Domain Id, Principal Priority, And Domain Id Lock; Common Topologies; Switch Services - HP StorageWorks 8/20q Installation And Reference 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 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.

Switch services

You can configure your switch to suit the demands of your environment by enabling or disabling a variety
of switch services. Familiarize yourself with the following switch services and determine which ones you
need.
• Telnet: Provides for the management of the switch over a Telnet connection. Disabling this service is not
recommended. The default is enabled.
• Secure Shell (SSH): Provides for secure remote connections to the switch using SSH. Your workstation
must also use an SSH client. The default is disabled.
• GUI Management: Provides for out-of-band management of the switch with Simple SAN Connection
Manager, QuickTools, SNMP, and SMI-S. If this service is disabled, the switch can only be managed
inband or through the serial port. The default is enabled.
• Inband Management: Provides for the management of the switch over an inter-switch link using Simple
SAN Connection Manager, QuickTools, SNMP, or management server. If you disable inband
management, you can no longer communicate with that switch by means other than an Ethernet or
serial connection. The default is enabled.
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