Fibre Channel Addressing and Routing Fabric Configuration Process
Build Fabric (BF)
Stage 2: Principal Switch Selection
Only one
Switch with
switch with Domain ID list?
Non-disruptive
No
Overlapping Domain IDs?
No
Unique switch priority value?
No
Lowest WWN becomes
Principal Switch Yes
Highest priority becomes
Principal switch Yes
Reconfigure Fabric (RCF)
Disruptive
Yes
ID list becomes Principal Switch
The Principal Switch is selected based on the following criteria: • Domain ID list—A switch that has a list of existing Domain IDs for the fabric (that is, the current Principal Switch) takes precedence over other switches.
• Principal Switch Priority—The administrator can assign a priority value to each switch; lower priority values take precedence over higher values. This priority value is used if more than one switch has a Domain ID list or if no switches have a Domain ID list (that is, if there is currently no Principal Switch).
• WWN—If the Principal Switch cannot be selected based on Domain ID list and multiple switches have the same assigned priority value, the switch with the lowest WWN becomes the Principal Switch.