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

    Support: L1,L2
    Default: 10            Value: 1-65535

    Maximum interval, in seconds, between broadcast routing messages
    on broadcast circuits. This characteristic is only used by
    the Phase IV routing algorithm (that is, the routing-vector
    algorithm).