[edit protocols dot1x authenticator interface all supplicant]

 'supplicant multiple'

   Only supported for layer-2 interfaces

error: configuration check-out failed: (statements constraint check failed)

Multiple supplicant mode authenticates multiple end devices individually on one authenticator port.

> The error states that the multiple supplicant is allowed only for layer-2 interfaces, if you have any existing layer-3 interface configuration and when you apply dot1x multiple supplicant for all the interfaces, you might get the commit error as above.
> Deleting the interface all configuration will resolve the commit error.

           #delete protocol dot1x authenticator interface all supplicant multiple

> If multiple supplicant needs to be configured for more than one interface then it needs to be configured individually.
         
       #set protocol dot1x authenticator interface <interface-name> supplicant multiple