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

    Default: 600           Value: 1-65535

    Value to be used for current suggested hello timer in the absence
    of any suggested values from the IS.

    set [node node-id] routing default eshello timer integer

    Example:

    set routing default eshello timer 600