def verifyForDuplicatePorts(self, portList):
        """
        Description
           Verify if the portList has any duplicate ports.
           Raise an exception if true.
        """
        duplicatePorts = [x for n, x in enumerate(portList) if x in portList[:n]]
        if duplicatePorts:
            raise IxNetRestApiException('\nYour portList has duplicate ports {0}'.format(duplicatePorts))