1.TCPIP> SET MX_RECORD JUNO /GATEWAY=MARS /PREFERENCE=100

      Assigns MARS as the gateway for host JUNO with a preference of
      100.

    2.TCPIP> SET MX_RECORD JUNO /GATEWAY=VENUS /PREFERENCE=200

      Assigns VENUS as the gateway for host JUNO with a preference of
      200.