VMS Help Sys Parameters, LAN_FLAGS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    (Alpha only) LAN_FLAGS is a bit mask used to enable features
    in the local area networks port drivers and support code. The
    default value for LAN_FLAGS is 0.

    The bit definitions are as follows:

    Bit        Description

    Bit 0      The default of zero indicates that ATM devices run in
               SONET mode. If set to 1, this bit indicates ATM devices
               run in SDH mode.
    Bit 1      If set, this bit enables a subset of the ATM trace
               and debug messages in the LAN port drivers and support
               code.
    Bit 2      If set, this bit enables all ATM trace and debug
               messages in the LAN port drivers and support code.
    Bit 3      If set, this bit runs UNI 3.0 over all ATM adapters.
    Bit 4      If set, this bit runs UNI 3.1 over all ATM adapters.
    Bit 5      If set, disables autoconfiguration over all Gigabit
               Ethernet Adapters.
    Bit 6      If set, enables the use of jumbo frames over all
               Gigabit Ethernet Adapters.

    LAN_FLAGS is a DYNAMIC parameter.