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

    Support: L1,L2
    Default: True          Value: True or false

    If true, specifies that the neighbor is expected to be DNA
    compliant, and so proprietary mechanisms are possible. If
    false, no router-to-router Hellos or LSPs will be sent over
    this circuit. This characteristic is supported only if the
    characteristic type is not x25 da. You can modify this
    characteristic only when the entity is disabled.