def getDeviceGroupByRouterId(self, routerId=None, queryDict=None, runQuery=True):
        """
        Description
            Get the Device Group object handle for the routerId.
            
            Note:
               A Device Group could have many IP host (sessions). This is configured as multipliers in
               a Device Group.  If multiplier = 5, there will be 5 IP host. Each host will
               have a unique router ID identifier.
               To get the Device Group that has a specific router ID, pass in the router ID for the
               parameter routerId.

        Parameter
            routerId: <str>: The router ID in the format of 192.0.0.1.
            queryDict: <dict>: Ignore this parameter. This parameter is only used internally. 
            runQuery: Ignore this parameter.  <bool>: This parameter is only used internally.  

        Example:
            obj = mainObj.getDeviceGroupByRouterId(routerId='192.0.0.3')

           How to getMac:
               Step 1> Get the Device Group that has routerId
                       deviceGroupObjHandle = self.getDeviceGroupByRouterId(routerId=routerId)
               Step 2> Append the /ethernet/1 endpoint object to the Device Group object.
                       ethernetObjHandle = deviceGroupObjHandle + '/ethernet/1'
               Step 3> Get the mac address using the ethernetObjHandle
                       return self.getObjAttributeValue(ethernetObjHandle, 'mac')

        Return
            - deviceGroup object handle: /api/v1/sessions/1/ixnetwork/topology/1/deviceGroup/1
            - None if routerid is not found
        """
        if runQuery:
            queryData = {'from': '/',
                        'nodes': [{'node': 'topology',    'properties': ['name'], 'where': []},
                                  {'node': 'deviceGroup', 'properties': [], 'where': []},
                                  {'node': 'routerData', 'properties': ['routerId'], 'where': []}
                              ]
                        }
            queryResponse = self.ixnObj.query(data=queryData)
            queryDict = queryResponse.json()['result'][0]
        
        object = None
        for key,value in queryDict.items():
            # All the Topology Groups
            if type(value) is list:
                for keyValue in value:
                    print()

                    for deepKey,deepValue in keyValue.items():
                        if deepKey == 'routerId':
                            # deepValue = /api/v1/sessions/1/ixnetwork/multivalue/1054
                            # ['192.0.0.1', '192.0.0.2', '192.0.0.3']
                            multivalueObj = deepValue
                            value = self.ixnObj.getMultivalueValues(multivalueObj)
                            if routerId in value:
                                # /api/v1/sessions/1/ixnetwork/topology/1/deviceGroup/1/routerData/1
                                match = re.match('(/api.*)/routerData', keyValue['href'])
                                deviceGroupObj = match.group(1)
                                self.ixnObj.logInfo('deviceGroupHandle for routerId: {0}\n\t{1}'.format(routerId, deviceGroupObj), timestamp=False)
                                return deviceGroupObj

                    object = self.getDeviceGroupByRouterId(queryDict=keyValue, routerId=routerId, runQuery=False)
                    if object is not None:
                        return object