/CHECKSUMMING
       /NOCHECKSUMMING

    Enables or disables checksum verification on the selected VCs to
    the specified nodes.

    You can use this command alone or in combination with the system
    parameter NISCS_PORT_SERV. (For more information, see online help
    for NISCS_PORT_SERV.)

    Note that the the SET VC/CHECKSUMMING setting is not valid beyond
    the life of the system. Therefore, you might want to include SET
    VC/CHECKSUMMING commands in your startup file, or reissue these
    commands at the next boot.