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

    Support: End
    Default: Integrated (OpenVMS)        Value: Segregated or
             Segregated (Tru64 UNIX)          Integrated

    Determines the behavior of the forwarding algorithm. When the
    routing mode is set to Segregated, data being transmitted to
    Phase IV destination addresses is sent in Phase IV format packets,
    to the adjacent Phase IV router, if available. In Integrated mode,
    data is sent to Phase V (OSI) router adjacencies in CLNP packets,
    if possible.

    This characteristic can only be set when Routing is disabled.
    For example, to switch to segregated mode from the default:

       NCL> disable routing
       NCL> set routing routing mode = segregated
       NCL> enable routing
       NCL> enable routing circuit *