McDATA® 4Gb SAN Switch for HP p-Class BladeSystem Installation Guide (AA-RW1XA-TE, June 2005)

22 Planning
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 97–127 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 – 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. Refer to 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. Refer to 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 or the Set
Config Switch command. WWN zoning members is recommended.
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.
• Switch Management — provides for out-of-band management of the switch with Telnet, McData Web
Server, and CIM. The switch can be managed by SNMP supported management programs. SNMP is
supported both inband and out of band. If this service is disabled, the switch can only be managed
inband. The default is enabled.
• Inband Management — provides for the management of the switch over FC using the McDATA Web
Server, SNMP, or management server. If you disable inband management and out of band
management, you can no longer communicate with that switch. The default is enabled. Access to an
entry switch via ethernet is required.
• Secure Socket Layer (SSL) — provides for secure SSL connections for the McDATA Web Server and
CIM. To enable secure SSL connections, you must first synchronize the date and time on the switch and
workstation. Enabling SSL automatically creates a security certificate on the switch. The default is
disabled.