VMS Help LANCP, SET, DEVICE parameters, Qualifiers, /CACHE_ENTRIES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /CACHE_ENTRIES=value

    Sets the number of entries to reserve for caching Token Ring
    source routing address entries. The default value is 200 entries.

    If your system directly communicates to a large number of
    systems, you may want to increase this number.