def getVportObjectByName(self, portName):
        """
        Description:
           Get the vport object by the specified port name.

        Parameter
           portName: <str>: The name of the virtual port.
        """
        response = self.ixnObj.get(self.ixnObj.sessionUrl+'/vport')
        vportList = ["%s/vport/%s" % (self.ixnObj.sessionUrl, str(i["id"])) for i in response.json()]
        for vportObj in vportList:
            response = self.ixnObj.get(vportObj)
            if response.json()['name'] == portName:
                return vportObj
        return None