def releasePorts(self, portList):
        """
        Description
            Release the specified ports in a list.

        Parameter
            portList: <list>: A list of ports in a list, to release in format of...
                      [[ixChassisIp, str(cardNum), str(portNum)], [], [] ...]
        """
        vportList = []
        for port in portList:
            vport = self.getVports([port])
            if vport == []:
                continue
            vportList.append(vport[0])

        url = self.ixnObj.sessionUrl+'/vport/operations/releaseport'
        response = self.ixnObj.post(url, data={'arg1': vportList})
        self.ixnObj.waitForComplete(response, url+'/'+response.json()['id'], timeout=120)