set  [node node-id] routing circuit circuit-name -
         reachable address simple-name ...

    Modifies attributes of a routing circuit reachable address entity
    which contains information about a manually entered address prefix
    accessible over that circuit.  It exists only on L2 routers and
    end nodes.   The modifiable routing circuit reachable address
    attributes and their data types [in brackets] are:

    block size [integer]
    cost [integer]
    data format [PhaseIV or Phasev]
    DTE addresses [set of dte addresses]
    ISDN address [isdn-address]
    LAN address [id]
    metric type [metric-type]
    mapping [string]
    modem addresses [modem-address]
    modem address prefix [modem-address-prefix]
    modem address suffix [modem-address-suffix]
    permitted lan address [lan-address]
    type [string]