Creates an instance of a routing circuit entity which represents
    a data link to another node, specified by the simple name
    circuit-name.

    create  [node node-id] routing circuit circuit-name -
          type circuit-type

    The Type argument is required.  Possible circuit-type values are:

    csma-cd             - a broadcast circuit
    ddcmp               - a DDCMP circuit
    fddi                - an FDDI large packet circuit
    hdlc                - an HDLC circuit
    x25 da              - a dynamically allocated X.25 circuit
    x25 permanent       - an X.25 permanent virtual circuit
    x25 static incoming - a static incoming X.25 circuit
    x25 static outgoing - a static outgoing X.25 circuit

    On OpenVMS for FDDI routing circuits, the type should only be
    fddi if large packet support is in use, otherwise the type should
    be csma-cd.

    Examples:

    create routing circuit fddi-1 type csma-cd

    create routing circuit fddi-1 type fddi ! for large packet support

    Select adjacency for information on creating routing circuit
    adjacency subentities.

    Select reachable_address for information on creating routing
    circuit reachable address subentities.