Cisco Nexus 5500 Series NX-OS Configuration Manual page 61

Configuring Fibre Channel Domain Parameters
• The principal switch assigns the requested domain ID if available. Otherwise, it assigns another available
domain ID.
Figure 3: Configuration Process Using the Preferred Option
The operation of a subordinate switch changes based on three factors:
• The allowed domain ID lists
• The configured domain ID
• The domain ID that the principal switch has assigned to the requesting switch
In specific situations, the changes are as follows:
• When the received domain ID is not within the allowed list, the requested domain ID becomes the
runtime domain ID and all interfaces on that VSAN are isolated.
• When the assigned and requested domain IDs are the same, the preferred and static options are not
relevant, and the assigned domain ID becomes the runtime domain ID.
• When the assigned and requested domain IDs are different, the following cases apply:
OL-30895-01
◦ If the configured type is static, the assigned domain ID is discarded, all local interfaces are isolated,
and the local switch assigns itself the configured domain ID, which becomes the runtime domain
ID.
◦ If the configured type is preferred, the local switch accepts the domain ID assigned by the principal
switch and the assigned domain ID becomes the runtime domain ID.
Cisco Nexus 5500 Series NX-OS SAN Switching Configuration Guide, Release 7.x
Domain IDs
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