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25-5
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 25 Configuring Domain Parameters
Fibre Channel Domains
About Switch Priority
By default, the configured priority is 128. The valid range to set the priority is between 1 and 254.
Priority 1 has the highest priority. Value 255 is accepted from other switches, but cannot be locally
configured.
Any new switch can become the principal switch when it joins a stable fabric. During the principal
switch selection phase, the switch with the highest priority becomes the principal switch. If two switches
have the same configured priority, the switch with the lower WWN becomes the principal switch.
The priority configuration is applied to runtime when the fcdomain is restarted (see the “About Domain
Restart” section on page 25-3). This configuration is applicable to both disruptive and nondisruptive
restarts.
Configuring Switch Priority
To configure the priority for the principal switch using Fabric Manager, follow these steps:
Step 1 Expand Fabricxx > VSANxx and then select Domain Manager in the Logical Domains pane for the
fabric and VSAN that you want to set the principal switch priority for.
You see the domain’s running configuration in the Information pane shown in Figure 25-4.
Figure 25-4 Running Domain Configuration
Step 2
Set Priority to a high value for the switch in the fabric that you want to be the principal switch.
Step 3 Click the Apply Changes icon to save these changes.
About fcdomain Initiation
By default, the fcdomain feature is enabled on each switch. If you disable the fcdomain feature in a
switch, that switch can no longer participate with other switches in the fabric. The fcdomain
configuration is applied to runtime through a disruptive restart.
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