Assistance Type is an optional argument that specifies the
    degree of loopback assistance required.  Valid Assistant
    Type values are none, transmit, receive, and full.  This
    argument is for LAN circuits only.  If Assistance Type is
    any value other than none (the default), then an assistant
    is required.

    An assistant can be specified either by including an
    Assistant Address or Assistant System argument in the
    command line, but not both.  If neither is provided, then
    an assistant is located by first sending a request to the
    loopback assistant multicast address.

    loop  [node node-id] mop circuit circuit-name -
      address lan-address, -
      assistant address lan-address, -
      assistance type help-type [,optional arguments...]

    Address information specifying the node to receive the
    loop is required for the loop mop circuit command.  If
    the Address argument is not specified in the command,
    then the Client argument must be specified so the address
    information can be obtained from the MOP Client
    database.

    loop  [node node-id] mop circuit circuit-name -
      client client-name, -
      assistant system client-name, -
      assistance type help-type [,optional arguments...]

    Examples:

    loop mop circuit fddi-1 -
      address 08-00-2b-00-78-E4, -
      assistant address aa-00-04-00-33-44, -
      assistance type full

    loop mop circuit csmacd-1 -
      client foofoo, -        ! Client foofoo gives loop Address
      assistant system barbar,- ! barbar gives Assistant Address
      assistance type full