Library /sys$common/syshlp/nclhelp.hlb set, routing, circuit, L2 router priority  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Support: L2
    Default: 64            Value: 1-127

    Priority for becoming LAN level 2 designated router. This
    attribute is supported only if the circuit's characteristic type
    is csma-cd.