Modifies the Permitted LAN Addresses attribute of the specified
    Reachable Address instance on a particular Routing Circuit to
    include at least the address or addresses specified.

    add  [node node-id] routing circuit circuit-name -
         reachable address simplename -
         permitted lan addresses {address[,address...]}

    Permitted LAN Addresses

    Support: End
    Default: No LAN addresses        Value: Set of LAN addresses

    This is a set of LAN addresses corresponding to routers that
    are permitted to be used for forwarding to this prefix.  This
    attribute is supported only if the Type characteristic is set
    to "filter" on broadcast circuits only.  At least one LAN
    address is required.

    Example:

    add routing circuit csmacd-1 reachable address to-bulean -
         permitted lan addresses {aa-00-04-00-23-45}