code: def router_fabric_virtual_gateway_address_family_ipv4_gateway_mac_address(self, **kwargs):
          
          config = ET.Element("config")
          router = ET.SubElement(config, "router", xmlns="urn:brocade.com:mgmt:brocade-common-def")
          fabric_virtual_gateway = ET.SubElement(router, "fabric-virtual-gateway", xmlns="urn:brocade.com:mgmt:brocade-anycast-gateway")
          address_family = ET.SubElement(fabric_virtual_gateway, "address-family")
          ipv4 = ET.SubElement(address_family, "ipv4")
          gateway_mac_address = ET.SubElement(ipv4, "gateway-mac-address")
          gateway_mac_address.text = kwargs.pop('gateway_mac_address')
  
          callback = kwargs.pop('callback', self._callback)
          return callback(config)
docs: Auto Generated Code