> # Configuring the Host Name and IP Domain Name

> You must configure the host name and IP domain name of the switch if they are not already configured. This is required because switch FQDN is used as the subject in the identity certificate. Also, the switch FQDN is used as a default key label when none is specified during key-pair generation. For example, a certificate named SwitchA.example.com is based on a switch host name of SwitchA and a switch IP domain name of example.com.

> Caution | Changing the host name or IP domain name after generating the certificate can invalidate the certificate.

> ## Detailed Steps

> To configure the host name and IP domain name, refer to the Cisco MDS 9000 NX-OS Fundamental Configuration Guide.

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