> # Static Mapping

> With static mapping, an iSCSI host is mapped to a specific pWWN and nWWN. This mapping is maintained in persistent storage and each time the iSCSI host connects, the same WWN mapping is used. This mode is required if you use access control on the target device.

> You can implement static mapping in one of two ways:

> - User assignment—You can specify your own unique WWN by providing them during the configuration process.
> - System assignment—You can request that the switch provide a WWN from the switch’s Fibre Channel WWN pool and keep the mapping in its configuration.

> Tip We recommend using the system-assign option. If you manually assign a WWN, you must ensure its uniqueness (see the Fabric Configuration Guide, Cisco DCNM for SAN for more information). You should not use any previously assigned WWNs.

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