The Circuit over which the loop operation is to be performed.
    The the Client specified cannot provide Circuit and Address
    information, then that information must be specified in the
    command.

    loop  [node node-id] mop client client-name -
          address lan-address, -
          circuit circuit-name [,optional arguments...]

    Optional arguments for this loop mop circuit command are:
    Assistance Type, Assistant Address, Assistant System, Count,
    Format, and Length.

    Example:

    loop mop client lamchp -  ! Client lamchp gives loop Address
         circuit csmacd-1