Library /sys$common/syshlp/nclhelp.hlb set, routing, circuit, enable_phaseiv_address  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Support: All
    Default: True          Value: True or false

    Specifies whether the physical LAN address is to be set to the
    Phase IV style LAN address (that is, AA-00-04-00-xx-xx). The
    LAN address is set only if this attribute is true and the value
    of the Phase IV Address characteristic is not 0.0. If Phase IV
    Address is not 0.0 and there are multiple adaptors to the same
    LAN, only one circuit may have this attribute set to true. This
    characteristic is supported only if the characteristic type is
    set to csma-cd.

    set [node node-id] routing circuit circuit-name -
        enable phaseiv address boolean

    Example:

    set routing circuit csmacd-1 enable phaseiv address true