def getPortsByProtocol(self, protocolName):
        """
        Description
            Based on the specified protocol, return all ports associated with the protocol.

        Parameters
           protocolName options:
              bfd, bgp, cfm, eigrp, elmi, igmp, isis, lacp, ldp, linkOam, lisp, mld,
              mplsOam, mplsTp, openFlow, ospf, ospfV3, pimsm, ping, rip, ripng, rsvp,
              static, stp

        Returns: [chassisIp, cardNumber, portNumber]
                  Example: [['192.168.70.11', '1', '1'], ['192.168.70.11', '1', '2']]

        Returns [] if no port is configured with the specified protocolName
        """
        portList = []
        response = self.ixnObj.get(self.ixnObj.sessionUrl+'/vport')
        # ['http://{apiServerIp:port}/api/v1/sessions/1/ixnetwork/vport/1']
        vportList = ['%s/%s/%s' % (self.ixnObj.sessionUrl, 'vport', str(i["id"])) for i in response.json()]

        # Go through each port that has the protocol enabled.
        for vport in vportList:
            # http://{apiServerIp:port}/api/v1/sessions/1/ixnetwork/vport/1/protocols/ospf
            currentProtocol = vport+'/protocols/'+protocolName
            response = self.ixnObj.get(currentProtocol)
            if response.json()['enabled'] == True:
                # 192.168.70.11:1:5
                response = self.ixnObj.get(vport)
                assignedTo = response.json()['assignedTo']
                currentChassisIp  = str(assignedTo.split(':')[0])
                currentCardNumber = str(assignedTo.split(':')[1])
                currentPortNumber = str(assignedTo.split(':')[2])
                currentPort = [currentChassisIp, currentCardNumber, currentPortNumber]
                portList.append(currentPort)

        return portList