def configVxlanNgpf(self, obj=None, routerId=None, port=None, portName=None, ngpfEndpointName=None, hostIp=None, **kwargs):
        """
        Description
            Create or modify a VXLAN.  If creating a new VXLAN header, provide an IPv4 object handle.
            If creating a new VxLAN object, provide an IPv4 object handle.
            If modifying a OSPF, there are five options. 2-6 will query for the OSPF object handle.

               1> Provide the OSPF object handle using the obj parameter.
               2> Set routerId.
               3> Set port: The physical port.
               4> Set portName: The vport port name.
               5> Set NGPF OSPF name that you configured.
               6> Set hostIp: The src IP.
            
        Parameters
               obj: <str>: IPv4 Obj example: /api/v1/sessions/{id}/ixnetwork/topology/{id}/deviceGroup/{id}/ethernet/{id}/ipv4/{id}
                           VxLAN Obj example: /api/v1/sessions/{id}/ixnetwork/topology/{id}/deviceGroup/{id}/ethernet/{id}/ipv4/{id}/vxlan/{id}

        Syntax
            POST:  /api/v1/sessions/{id}/ixnetwork/topology/{id}/deviceGroup/{id}/ethernet/{id}/ipv4/{id}/vxlan
            PATCH: /api/v1/sessions/{id}/ixnetwork/topology/{id}/deviceGroup/{id}/ethernet/{id}/ipv4/{id}/vxlan/{id}

        Example:
            createVxlanNgpf(ipv4Object='/api/v1/sessions/1/ixnetwork/topology/1/deviceGroup/1/ethernet/1/ipv4/1',
                            vtepName='vtep_1',
                            vtepVni={'start':2008, 'step':2, 'direction':'increment'},
                            vtepIpv4Multicast={'start':'225.8.0.1', 'step':'0.0.0.1', 'direction':'increment'})

            start = The starting value
            step  = 0 means don't increment or decrement.
                    For IP step = 0.0.0.1.  Increment on the last octet.
                                  0.0.1.0.  Increment on the third octet.
            direction = increment or decrement the starting value.

        Return
            /api/v1/sessions/{id}/ixnetwork/topology/{id}/deviceGroup/{id}/ethernet/{id}/ipv4/{id}/vxlan/{id}
        """
        if obj != None:
            if 'vxlan' not in obj:
                self.ixnObj.logInfo('Create new VxLAN in NGPF')
                response = self.ixnObj.post(self.ixnObj.httpHeader+obj+'/vxlan')
                vxlanId = response.json()['links'][0]['href']
                self.ixnObj.logInfo('createVxlanNgpf: %s' % vxlanId)

            if 'vxlan' in obj:
                vxlanId = obj

        # To modify
        if ngpfEndpointName:
            vxlanId = self.getNgpfObjectHandleByName(ngpfEndpointName=ngpfEndpointName, ngpfEndpointObject='vxlan')

        # To modify
        if port:
            x = self.getProtocolListByPortNgpf(port=port)
            vxlanId = self.getProtocolObjFromProtocolList(x['deviceGroup'], 'vxlan')[0]

        # To modify
        if portName:
            x = self.getProtocolListByPortNgpf(portName=portName)
            vxlanId = self.getProtocolObjFromProtocolList(x['deviceGroup'], 'vxlan')[0]

        # To modify
        if routerId:
            vxlanId = self.getNgpfObjectHandleByRouterId(routerId=routerId, ngpfEndpointObject='vxlan')

        # To modify
        if hostIp:
            x = self.getProtocolListByHostIpNgpf(hostIp)
            vxlanId = self.getProtocolObjFromHostIp(x, protocol='vxlan')

        # Get VxLAN metadatas
        vxlanResponse = self.ixnObj.get(self.ixnObj.httpHeader+vxlanId)

        for key,value in kwargs.items():
            if key == 'vtepName':
                self.ixnObj.patch(self.ixnObj.httpHeader+vxlanId, data={'name': value})

            if key == 'vtepVni':
                multivalue = vxlanResponse.json()['vni']
                self.ixnObj.logInfo('Configuring VxLAN attribute: %s: %s' % (key, value))
                data={'start':kwargs['vtepVni']['start'], 'step':kwargs['vtepVni']['step'], 'direction':kwargs['vtepVni']['direction']}
                self.configMultivalue(multivalue, 'counter', data=data)

            if key == 'vtepIpv4Multicast':
                self.ixnObj.logInfo('Configuring VxLAN IPv4 multicast')
                multivalue = vxlanResponse.json()['ipv4_multicast']
                data={'start':kwargs['vtepIpv4Multicast']['start'], 'step':kwargs['vtepIpv4Multicast']['step'], 
                      'direction':kwargs['vtepIpv4Multicast']['direction']}
                self.configMultivalue(multivalue, 'counter', data=data)

        self.configuredProtocols.append(vxlanId)
        return vxlanId