> # Information About Device Aliases

> When the port WWN (pWWN) of a device must be specified to configure different features (zoning, QoS, port security) in a Cisco MDS 9000 Family switch, you must assign the correct device name each time you configure these features. An incorrect device name can cause unexpected results. You can avoid this problem if you define a user-friendly name for a port WWN and use this name in all of the configuration commands as required. These user-friendly names are referred to as device aliases in this chapter.

> - About Device Alias Modes
> - Changing Mode Settings
> - Device Alias Mode Distribution
> - Merging Device Alias
> - Resolving Merge and Device Alias Mode Mismatch
> - Device Alias Features
> - Device Alias Requirements
> - Zone Aliases Versus Device Aliases
> - Device Alias Databases
> - About Device Alias Distribution
> - About Creating a Device Alias
> - Fabric Lock Override
> - About Legacy Zone Alias Configuration Conversion

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