def getNgpfObjectHandleByRouterId(self, ngpfEndpointObject, routerId):
        """
        Description
           Get the NGPF object handle filtering by the routerId.
           All host interface has a router ID by default and the router ID is located in the 
           Device Group in the IxNetwork GUI.  The API endpoint is: /topology/deviceGroup/routerData
        
           Note: Router ID exists only if there are protocols configured.

        Parameters
           ngpfEndpointObject: <str>: The NGPF endpoint. Example:
                               deviceGroup, ethernet, ipv4, ipv6, bgpIpv4Peer, ospfv2, etc.
                               These endpoint object names are the IxNetwork API endpoints and you could
                               view them in the IxNetwork API browser.

           routerId: <str>: The router ID IP address.

        Example:
              protocolObj.getNgpfObject(ngpfEndpointObject='ipv4', routerId='192.0.0.1')
                 return objectHandle: /api/v1/sessions/1/ixnetwork/topology/1/deviceGroup/1/ethernet/1/ipv4/1

              protocolObj.getNgpfObject(ngpfEndpointObject='bgpIpv4Peer', routerId='193.0.0.1')
                 return objectHandle: /api/v1/sessions/1/ixnetwork/topology/2/deviceGroup/1/ethernet/1/ipv4/1/bgpIpv4Peer/2

              protocolObj.getNgpfObject(ngpfEndpointObject='networkGroup', routerId='193.0.0.1')
                 return objectHandle: /api/v1/sessions/1/ixnetwork/topology/1/deviceGroup/1/networkGroup/1

              protocolObj.getNgpfObject(ngpfEndpointObject='ipv4PrefixPools', routerId='193.0.0.1')
                 return objectHandle: /api/v1/sessions/1/ixnetwork/topology/1/deviceGroup/1/networkGroup1/ipv4PrefixPools/1
        """
        ngpfMainObjectList = ['topology', 'deviceGroup', 'ethernet', 'ipv4', 'ipv6',
                              'networkGroup', 'ipv4PrefixPools', 'ipv6PrefixPools']

        ngpfL2ObjectList = ['isisL3', 'lacp', 'mpls']

        ngpfL3ObjectList = ['ancp', 'bfdv4Interface', 'bgpIpv4Peer', 'bgpIpv6Peer', 'dhcpv4relayAgent', 'dhcpv6relayAgent',
                            'geneve', 'greoipv4', 'greoipv6', 'igmpHost', 'igmpQuerier',
                            'lac', 'ldpBasicRouter', 'ldpBasicRouterV6', 'ldpConnectedInterface', 'ldpv6ConnectedInterface',
                            'ldpTargetedRouter', 'ldpTargetedRouterV6', 'lns', 'mldHost', 'mldQuerier', 'ptp', 'ipv6sr',
                            'openFlowController', 'openFlowSwitch', 'ospfv2', 'ospfv3', 'ovsdbcontroller', 'ovsdbserver',
                            'pcc', 'pce', 'pcepBackupPCEs', 'pimV4Interface', 'pimV6Interface', 'ptp', 'rsvpteIf',
                            'rsvpteLsps', 'tag', 'vxlan'
                        ]
        
        if ngpfEndpointObject not in ngpfL2ObjectList + ngpfL3ObjectList + ngpfMainObjectList:
            raise IxNetRestApiException('\nError: No such ngpfEndpointObject: %s' % ngpfEndpointObject)

        if ngpfEndpointObject in ngpfL2ObjectList + ngpfL3ObjectList:
            if ngpfEndpointObject in ngpfL2ObjectList:
                nodesList = [{'node': 'topology', 'properties': [], 'where': []},
                             {'node': 'deviceGroup', 'properties': [], 'where': []},
                             {'node': 'routerData', 'properties': ['routerId'], 'where': []},
                             {'node': 'ethernet', 'properties': [], 'where': []}
                ]

            if ngpfEndpointObject in ngpfL3ObjectList:
                nodesList = [{'node': 'topology', 'properties': [], 'where': []},
                             {'node': 'deviceGroup', 'properties': [], 'where': []},
                             {'node': 'routerData', 'properties': ['routerId'], 'where': []},
                             {'node': 'ethernet', 'properties': [], 'where': []},
                             {'node': 'ipv4', 'properties': [], 'where': []},
                             {'node': 'ipv6', 'properties': [], 'where': []}
                ]

            # Add the protocol level to the end of the list.
            nodesList.insert(len(nodesList), {'node': ngpfEndpointObject, 'properties': [], 'where': []})

        # User is looking for non protocol object handle such as deviceGroup, ethernet, ipv4 or ipv6
        if ngpfEndpointObject not in ngpfL2ObjectList + ngpfL3ObjectList:
                nodesList = [{'node': 'topology', 'properties': [], 'where': []},
                             {'node': 'deviceGroup', 'properties': [], 'where': []},
                             {'node': 'networkGroup', 'properties': [], 'where': []},
                             {'node': 'ethernet', 'properties': [], 'where': []},
                             {'node': 'ipv4PrefixPools', 'properties': [], 'where': []},
                             {'node': 'ipv6Prefixpools', 'properties': [], 'where': []},
                             {'node': 'routerData', 'properties': ['routerId'], 'where': []},
                             {'node': 'ethernet', 'properties': [], 'where': []},
                             {'node': 'ipv4', 'properties': [], 'where': []},
                             {'node': 'ipv6', 'properties': [], 'where': []}
                ]

        queryData = {'from': '/', 'nodes': nodesList}
        queryResponse = self.ixnObj.query(data=queryData)

        # This is for getObject out of scope variable tracking
        class getObjectVar:
            protocolObjHandle= None
            foundRouterId = False