CN113965464A

CN113965464A - Method and network equipment for interworking of virtualized network function network elements

Info

Publication number: CN113965464A
Application number: CN202010611288.1A
Authority: CN
Inventors: 马嫄; 党盛雄
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2022-01-21

Abstract

The embodiment of the invention relates to the field of communication, and discloses a method and network equipment for interworking of virtualized network function network elements. The method for interworking the network elements with the virtualized network functions comprises the following steps: acquiring dynamic routing information dynamically issued by at least two virtual network function VNF network elements; generating route forwarding information reaching at least two VNF network elements according to the dynamic route information; and sending the routing forwarding information to a switch so as to enable at least two VNF network elements to carry out data communication through the switch. By adopting the method for interworking the network elements with the virtualized network functions in the embodiment, the VNF network elements can communicate with each other, and the efficiency of automatic configuration and service opening based on the network connection of the VNF network elements is improved.

Description

Method and network equipment for interworking of virtualized network function network elements

Technical Field

The embodiment of the invention relates to the field of communication, in particular to a method and network equipment for interworking of virtualized network function network elements.

Background

At present, based on a private cloud service deployed by a Software Defined Network (SDN), a controller provides services such as Network access, routing, intercommunication and the like for various Virtual Machines (VMs) and bare metal servers. With the integration of Network Function Virtualization (NFV) and SDN technologies, a novel core Network cloud architecture appears, which provides Network services for Network Function Virtualization Infrastructure (NFVI) through an SDN Network deployed in a data center, and a main difference from a private cloud service is that a routing Virtualized Network Function (VNF) Network element is introduced. In the current SDN networking architecture, a VNF network element is directly connected to a switch, and the switch is connected to an SDN controller.

However, in implementing the embodiments of the present invention, the inventors found that: generally, the user address in the VNF network element changes dynamically, a cloud platform connected to the SDN controller cannot acquire the part of dynamic address routing information, and cannot issue the dynamic address routing information to the SDN controller, the SDN controller cannot send a flow table to a switch connected to the VNF network element, and the VNF network elements cannot communicate with each other normally, which affects automatic configuration of network connection of the VNF network elements and automatic opening of services.

Disclosure of Invention

Embodiments of the present invention provide a method and a network device for interworking a virtualized network function network element, so that VNF network elements can communicate with each other, and efficiency of automatic configuration and service provisioning based on VNF network element network connection is improved.

To solve the above technical problem, an embodiment of the present invention provides a method for interworking network elements with virtualized network functions, including: acquiring dynamic routing information dynamically issued by at least two virtual network function VNF network elements; generating route forwarding information reaching at least two VNF network elements according to the dynamic route information; and sending the routing forwarding information to a switch so as to enable at least two VNF network elements to carry out data communication through the switch.

The embodiment of the invention also provides a method for interworking the functional network elements of the virtualized network, which is applied to the gateway of the SDN network and comprises the following steps: receiving first routing information sent by a controller from a gateway to a Virtual Network Function (VNF) network element; acquiring dynamic routing information from a VNF network element according to the first routing information, wherein the VNF network element is directly hung on a switch; and issuing the acquired dynamic routing information to the controller.

An embodiment of the present invention further provides a network device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to perform the above-mentioned method of interworking of virtualized network function network elements, or to perform the method of interworking of virtualized network function network elements applied to a gateway.

Compared with the prior art, the embodiment of the invention acquires dynamic routing information dynamically issued by a VNF network element, the controller generates routing forwarding information reaching the VNF network element according to the dynamic routing information of the VNF, and sends the routing forwarding information to the switch, and the routing forwarding information comprises the routing information of at least two VNF network elements, so that each network element can communicate through the switch; because the network elements can communicate with each other, the VNF network elements can be flexibly opened and configured, and meanwhile, the VNF network elements can communicate with each other, so that the opened service can interact with other VNF network elements, and the efficiency of opening the service in the VNF network elements is improved.

Drawings

One or more embodiments are illustrated by the corresponding figures in the drawings, which are not meant to be limiting.

Fig. 1 is a flow chart of a method of virtualized network function network element interworking in accordance with a first embodiment of the present invention;

fig. 2 is a flow chart of a method of virtualized network function network element interworking in accordance with a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of an SDN networking according to a second embodiment of the present invention;

fig. 4 is a flow chart of a method of virtualized network function network element interworking in a third embodiment in accordance with the present invention;

fig. 5 is a flow chart of a method of virtualized network function network element interworking in a fourth embodiment in accordance with the present invention;

fig. 6 is a schematic structural diagram of a network device according to a fifth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.

A first embodiment of the present invention relates to a method for interworking network elements of virtualized network functions, which is applied to a controller and the flow of which is shown in fig. 1.

Step 101: and acquiring dynamic routing information dynamically issued by at least two VNF network elements.

Step 102: and generating route forwarding information reaching at least two VNF network elements according to the dynamic route information.

Step 103: and sending the routing forwarding information to the switch so as to enable the at least two VNF network elements to carry out data communication through the switch.

A second embodiment of the present invention relates to a method for interworking network elements with virtualized network functions, which may be applied to an SDN controller, and a flowchart thereof is shown in fig. 2:

step 201: the static address information of at least two VNF network elements and the topological structure information of the SDN networking are obtained.

Specifically, the topology based on SDN networking is shown in fig. 3, and includes: SDN controllers, gateways, switches, and VNF network elements. The VNF network element comprises: an Operation and Maintenance Unit (OMU) and an Interface Processing Unit (IPU); a dynamic routing protocol stack is built in the VNF network element, and the IPU is used as a direct interface of the VNF network element and is used for establishing a link by a routing protocol and dynamically notifying dynamic routing information in the VNF network element. The VNF network elements are directly hung on the switches, the SDN networking comprises a plurality of switches, at least one VNF network element is directly hung under each switch, each switch is connected to the gateway, and the switches are connected with one another. In this example, the switch may be an SDN switch, and two VNF network elements are shown in fig. 3.

In this example, a method for interworking a virtualized network function network element is described by taking an SDN networking structure shown in fig. 3 as an example. The SDN controller is connected with the cloud platform, the cloud platform can be a network cloud end and used for controlling and managing the SDN controller, the cloud platform faces a manager of the SDN networking, the cloud platform can configure static address information for each VNF network element in the SDN networking and send the static address information to the SDN controller, and the SDN controller receives the static address information of each VNF network element. The static address information of the VNF network element includes: an address resolution protocol, ARP, table of the interface address of the VNF network element. The SDN controller can calculate topology link information between switches and topology link information between the switches and the SDN gateway, and then topology structure information of the whole SDN networking can be obtained.

Step 202: and generating first routing information from a gateway to the VNF network elements in the SDN networking according to the static address information of at least two VNF network elements and the topological structure information of the SDN networking.

In this example, an ARP forwarding table of the gateway and an ARP forwarding table of the switch are respectively generated according to the obtained ARP of the interface address of the VNF network element and the link topology information between the gateway and the switch, where an outgoing interface of the ARP forwarding table of the gateway is a tunnel port connected to the VNF network element directly connected to the switch, and an outgoing interface of the ARP forwarding table of the switch is an interface connected to the VNF network element; and taking the ARP forwarding table of the gateway and the ARP forwarding table of the switch as first routing information from the gateway to the VNF network element.

Specifically, an ARP table of an interface address of the VNF network element is an ARP of an IPU interface in the VNF network element, link topology information between the SDN switch and the gateway is obtained from topology structure information of the SDN networking, an ARP forwarding table of the gateway and an ARP forwarding table of the switch can be generated, an outgoing interface of the ARP forwarding table of the gateway is a tunnel port of a switch directly connected to the VNF network element, and an exit package includes tunnel information, that is, the switch directly connected to the VNF network element can be searched through the VNF network element, and the outgoing interface of the gateway forwarding table is determined to be the tunnel port connected to the searched switch; an output interface of an ARP forwarding table of the switch is an interface connected with a VNF network element; and taking the ARP forwarding table of the gateway and the ARP forwarding table of the switch as routing information from the gateway to the VNF network element. The tunnel port between the switch and the gateway directly connected to the VNF Network element is a Virtual extensible Local Area Network (VxLAN) tunnel port.

Step 203: and sending the first routing information to a gateway and a switch directly connected with the VNF network element so that the gateway acquires the dynamic routing information from the VNF network element according to the first routing information.

Specifically, the gateway is an entity hardware device, so the SDN controller may convert an ARP forwarding table of the gateway into a configuration command and issue the configuration command to the gateway, thereby implementing the configuration of the gateway. The switch directly connected to the VNF network element may be an entity hardware device or a deployed virtual switch, and if the switch is an entity device, the ARP forwarding table of the switch may be converted into a configuration command and sent to the switch, and the switch executes the configuration command. If the switch is a virtual switch vSwitch, the ARP forwarding table of the switch may be converted into an openflow forwarding table, and the openflow forwarding table is issued to the vSwitch.

And the gateway and the switch receive the first routing information, namely, a VxLAN forwarding path between the gateway and the IPU of the VNF network element can be opened, so that the IPU of the VNF network element and the gateway can be communicated.

Specifically, in this example, the Gateway is used as a centralized point for acquiring dynamic routing information issued by each VNF in the SDN networking, and the cloud platform may issue, to the SDN controller, an Internal Gateway Protocol (IGP) or Border Gateway Protocol (BGP) neighbor configuration to a VNF network element interface address, and the SDN controller automatically issues the configuration to the Gateway. The IPUs of the gateway and the VNF network element dynamically establish an IGP (internet gateway protocol) or BGP (border gateway protocol) routing neighbor through a VxLAN (virtual private LAN) forwarding path between the gateway and the VNF network element, the IPUs of the gateway and the VNF network element are neighbors, and when the VNF network element issues dynamic routing information, the gateway can acquire the dynamic routing information.

Step 204: dynamic routing information is obtained from the gateway.

In this example, a first neighbor relationship with the gateway is established; and receiving the updated dynamic routing information of the gateway according to the first neighbor relation, wherein the next hop of the updated dynamic routing information is the interface address of the VNF network element.

Specifically, the SDN controller enables a built-in routing Protocol stack, and a Gateway simultaneously enables a Multi-Protocol Border Gateway Protocol (MP-BGP) Ethernet Virtual Private Network (EVPN) routing Protocol function, and establishes a first neighbor relationship with the Gateway, so that the SDN controller and the Gateway are mutually EVPN neighbors.

The gateway starts the function of switching from EVPN RT-5V to RT-5G, inherits the next hop of the original route from the dynamic routing information of the VNF network element, and converts the next hop of the original route into the RT-5G route, and the next hop of the converted dynamic routing information is the interface address of the VNF network element. And the gateway issues the updated dynamic routing information to a built-in routing protocol stack of the SDN controller through a first neighbor relation.

It should be noted that if the gateway does not start the function of turning EVPN RT-5V to RT-5G, the gateway issues the RT-5V route to the SDN controller built-in routing protocol stack through the first neighbor relationship, the next hop of the route forwarding information generated by the SDN controller is a Virtual Tunnel End Point (VTEP) IP address of the SDN gateway, and the outgoing interface is a VxLAN Tunnel port pointing to the SDN gateway. The SDN controller converts the routing forwarding information into openflow forwarding flow tables to be issued to switches needing to be intercommunicated, when VNF network elements under 2 different switches are intercommunicated and forwarded, when the switches are matched with the openflow forwarding flow tables, all outgoing interfaces point to VxLAN tunnel ports of an SDN gateway, and a flow has a loop phenomenon, for example, the flow is forwarded to the SDN gateway from a switch 1 shown in FIG. 3, then forwarded to a switch 2, then forwarded back to the SDN gateway, and sequentially circulated. Starting an RT-5V to RT-5G function of an EVPN route through an SDN gateway, and converting the next jump of the route learned from the VNF network element inheriting the original route into RT-5G, namely taking an IPU interface address of the VNF network element as a GW-IP of the RT-5G route. And meanwhile, the SDN gateway distributes the converted RT-5G route to a built-in routing protocol stack of the SDN controller through a first neighbor relation, so that the SDN controller generates route forwarding information to the VNF network element, and the next hop is a GW-IP attribute acquired from the RT-5G route, namely an IPU interface address of the VNF network element.

It is worth mentioning that the SDN gateway starts an EVPN route RT-5V to RT-5G function, inherits the next hop of the original route from the dynamic route learned by the VNF network element, converts the learned next hop of the original route into an EVPN RT-5G route, and issues the EVPN RT-5G route to the built-in routing protocol stack of the SDN controller, so that the next hop of the dynamic routing table generated by the SDN controller is the ip interface address of the original VNF network element instead of the VTEPIP address of the SDN gateway, thereby effectively preventing the problem of routing loops, realizing distributed traffic forwarding and interworking between VNF network elements, avoiding bypassing through the SDN gateway, and reducing the waste of the SDN gateway bandwidth.

Step 205: and generating route forwarding information reaching at least two VNF network elements according to the dynamic route information.

In this example, second routing information that reaches at least two VNF network elements is generated according to the dynamic routing information, and a next hop of the second routing information is an interface address of the VNF network element; and generating routing forwarding information reaching at least two VNF network elements according to the second routing information, the ARP table of the interface address of the VNF and link topology information among the switches.

Specifically, a routing protocol stack built in the SDN controller generates second routing information to the VNF network element according to the RT-5G route, and a next hop of the second routing information is a GW-IP attribute obtained in the RT-5G route, that is, an IPU interface address of the VNF network element. And the SDN controller iteratively generates route forwarding information reaching at least two VNF network elements according to the second route information, the static ARP table of the next hop IPU interface address and link topology information among the switches. An output interface of a routing forwarding table of the VNF network element direct-connected switch is an IPU interface address connected with the VNF network element; an outlet interface of a routing forwarding table of the VNF network element non-direct connection switch is a VxLAN tunnel port connected with the VNF network element direct connection switch, and outlet encapsulation comprises VxLAN tunnel information.

Step 206: and sending the routing forwarding information to the switch so as to enable the at least two VNF network elements to carry out data communication through the switch.

In this example, the route forwarding information is converted into a flow table; and issuing the flow table to the switch. The SDN controller converts the routing forwarding information to the VNF network element into an openflow forwarding flow table and sends the openflow forwarding flow table to the corresponding vSwitch; the interworking data flow between the VNF network elements finally reaches the destination VNF network element by forwarding the flow table through openflow matched with vSwitch. Distributed forwarding intercommunication between VNF network elements is realized without bypassing through an SDN gateway.

Specifically, the route forwarding information may be a routing table, and there are two cases of route forwarding information to the VNF network element that is iteratively generated by the SDN controller. One is a vSwitch directly connected with a VNF network element, and a routing forwarding information output interface of the vSwitch is an IPU interface address connected with the VNF network element; the other is a vSwitch with a non-direct connection of a VNF network element, an outlet interface of the routing forwarding information is a VxLAN tunnel port connected with the VNF network element direct-connection vSwitch, and an outlet package contains VxLAN tunnel information.

When VNF network elements under 2 different vSwitch are communicated with each other to forward data flow, the vSwitch which is not directly connected is matched with an openflow forwarding flow table, a VxLAN tunnel port of which an outlet interface is directly connected with the VNF network element is found, and after VxLAN tunnel information is packaged in the data flow, the data flow is forwarded from the VxLAN tunnel port. And when the direct connection vSwitch is reached, matching the openflow forwarding flow table again, finding out that the outlet interface is the address of the direct connection IPU interface, forwarding the address from the found outlet interface, and finally reaching the target VNF network element. Namely, the VNF network element interworking traffic under 2 different vSwitch directly performs distributed forwarding through the VxLAN tunnel between the vSwitch without bypassing through an SDN gateway.

In this example, the gateway is used to obtain the dynamic routing information published by each VNF network element, so that the influence on the routing link establishment of the SDN gateway and the obtaining of the dynamic routing information of the VNF network element when the VNF network element is dynamically migrated between different switches is avoided, and the effect of the connection stability between the SDN controller and the VNF network element is improved.

A third embodiment of the present invention relates to a method for interworking between functional network elements of a virtualized network, which is applied to a gateway, and a flowchart thereof is shown in fig. 4:

step 301: and receiving first routing information sent by the controller from the gateway to a network element of a Virtual Network Function (VNF).

Step 302: and acquiring dynamic routing information from the VNF network element according to the first routing information, wherein the VNF network element is directly hung on the switch.

Step 303: and issuing the acquired dynamic routing information to the controller.

Compared with the prior art, the embodiment of the invention can get through the channel between the gateway and the VNF network element through the first routing information issued by the SDN control, and further can obtain the dynamic routing information issued by the VNF network element; the acquired dynamic routing information is sent to the controller, and the controller generates a routing forwarding table according to the dynamic routing information to issue a switch connected with the VNF network element, so that at least two network elements can communicate with each other.

The fourth embodiment is a detailed description of the second embodiment. The flow of the method for interworking the network elements of the virtualized network function is shown in fig. 5:

step 401: and receiving first routing information sent by the controller from the gateway to a network element of a Virtual Network Function (VNF).

Specifically, the SDN controller is connected to a cloud platform, the cloud platform may be a network cloud for controlling and managing the SDN controller, the cloud platform faces a manager of the SDN networking, the cloud platform may configure static address information for each VNF network element in the SDN networking, and issue the static address information to the SDN controller, and the SDN controller receives the static address information of each VNF network element. The static address information of the VNF network element includes: an address resolution protocol, ARP, table of the interface address of the VNF network element.

The SDN controller respectively generates an ARP forwarding table of a gateway and an ARP forwarding table of a switch according to an ARP table of an interface address and link topology information between the gateway and the switch, wherein an outgoing interface of the ARP forwarding table of the gateway is a tunnel port for connecting a VNF network element directly to the switch, and an outgoing interface of the ARP forwarding table of the switch is an interface for connecting the VNF; and taking the ARP forwarding table of the gateway and the ARP forwarding table of the switch as first routing information from the gateway to the VNF network element. And the SDN controller issues the first routing information to a gateway and a switch connected with the gateway. In this example, the gateway may be an SDN gateway.

The gateway is an entity hardware device, so the SDN controller can convert an ARP forwarding table of the gateway into a configuration command and send the configuration command to the gateway, thereby realizing the configuration of the gateway. If the switch is an entity device, the ARP forwarding table of the switch can be converted into a configuration command to be issued to the switch in the same way, and the switch executes the configuration command. If the switch is a virtual switch vSwitch, the ARP forwarding table of the switch may be converted into an openflow forwarding table, and the openflow forwarding table is issued to the vSwitch.

Step 402: and configuring a routing protocol matched with the VNF network element.

In this example, the gateway is used as a centralized point for acquiring dynamic routing information issued by each VNF in the SDN networking, the cloud platform may configure the IGP or the BGP to the SDN controller, and the SDN controller automatically arranges and configures the SDN gateway, and the SDN gateway configures a routing protocol matched with a VNF network element according to the configuration command.

Step 403: and establishing a second neighbor relation with the VNF network element according to the first routing information and the routing protocol.

And the IPUs of the gateway and the VNF network element dynamically establish routing neighbors based on IGP or BGP through VxLAN forwarding paths between the gateway and the VNF network element, and the IPUs of the gateway and the VNF network element are neighbors to form a second neighbor relation between the gateway and the VNF network element.

Step 404: and acquiring dynamic routing information dynamically issued by the VNF network element according to the second neighbor relation.

When the VNF network element issues the dynamic routing information, the gateway may obtain the dynamic routing information according to the second neighbor relationship with the VNF network element.

Step 405: and the next jump in the dynamic routing information is converted into an interface address of the VNF network element.

It is worth mentioning that the SDN gateway starts an EVPN route RT-5V to RT-5G function, inherits the next hop of the original route from the dynamic route learned by the VNF network element, converts the learned next hop of the original route into an EVPN RT-5G route, and issues the EVPN RT-5G route to the built-in routing protocol stack of the SDN controller, so that the next hop of the dynamic routing table generated by the SDN controller is the IP interface address of the original VNF network element instead of the VTEP IP address of the SDN gateway, thereby effectively preventing the problem of routing loops, realizing distributed traffic forwarding and interworking between VNF network elements, avoiding bypassing through the SDN gateway, and reducing the waste of the bandwidth of the SDN gateway.

Step 406: and issuing the converted dynamic routing information to the controller.

The SDN controller establishes a first neighbor relation with a gateway; and receiving the dynamic routing information converted by the gateway according to the first neighbor relation, wherein the next hop of the converted dynamic routing information is the interface address of the VNF network element.

The SDN controller generates second routing information reaching at least two VNF network elements according to the dynamic routing information, and the next hop of the second routing information is an interface address of the VNF network elements; and generating routing forwarding information reaching at least two VNF network elements according to the second routing information, the ARP table of the interface address of the VNF and link topology information among the switches.

Specifically, a routing protocol stack built in the SDN controller generates second routing information to the VNF network element according to the RT-5G route, and a next hop of the second routing information is a GW-IP attribute obtained in the RT-5G route, that is, an IPU interface address of the VNF network element. And the SDN controller iteratively generates route forwarding information reaching at least two VNF network elements according to the second route information, the static ARP table of the next hop IPU interface address and link topology information among the switches. An output interface of a routing forwarding table of the VNF network element direct-connected switch is an IPU interface address connected with the VNF network element; an outlet interface of a routing forwarding table of the VNF network element non-direct connection switch is a VxLAN tunnel port connected with the VNF network element direct connection switch, and outlet encapsulation comprises VxLAN tunnel information. And the SDN controller sends the route forwarding information to the switch so as to enable the at least two VNF network elements to carry out data communication through the switch.

In addition, those skilled in the art can understand that the steps of the above methods are divided for clarity, and the implementation can be combined into one step or split into some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, and the method is within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.

A fifth embodiment of the present invention relates to a network device, as shown in fig. 6, including: at least one processor 501; and a memory 502 communicatively coupled to the at least one processor 501; wherein the memory 502 stores instructions executable by the at least one processor 501, the instructions being executable by the at least one processor 501 to enable the at least one processor 501 to perform the above-mentioned method for interworking a virtualized network functional network element.

Where the memory and processor are connected by a bus, the bus may comprise any number of interconnected buses and bridges, the buses connecting together one or more of the various circuits of the processor and the memory. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor is transmitted over a wireless medium via an antenna, which further receives the data and transmits the data to the processor.

The processor is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And the memory may be used to store data used by the processor in performing operations.

That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A method for interworking network elements with virtualized network functions, comprising:

acquiring dynamic routing information dynamically issued by at least two virtual network function VNF network elements;

generating route forwarding information reaching at least two VNF network elements according to the dynamic route information;

and sending the routing forwarding information to a switch so as to enable at least two VNF network elements to carry out data communication through the switch.

2. The method of claim 1, wherein the obtaining dynamic routing information dynamically published by at least two VNF network elements comprises:

acquiring static address information of at least two VNF network elements and topological structure information of Software Defined Network (SDN) networking;

generating first routing information from a gateway to the VNF network element in the SDN networking according to static address information of at least two VNF network elements and topological structure information of the SDN networking;

and sending the first routing information to the gateway and a switch directly connected with the VNF network element, so that the gateway acquires the dynamic routing information from the VNF network element according to the first routing information.

3. The method of claim 2, wherein the dynamic routing information obtained from the gateway comprises:

establishing a first neighbor relation with the gateway;

and receiving the updated dynamic routing information of the gateway according to the first neighbor relation, wherein the next hop of the updated dynamic routing information is the interface address of the VNF network element.

4. The method of claim 2 or 3, wherein the static address information of the VNF network element comprises: an Address Resolution Protocol (ARP) table of an interface address of the VNF network element;

the generating, according to the static address information of the at least two VNF network elements and the topology information of the SDN network, first routing information from a gateway in the SDN network to the VNF network element includes:

respectively generating an ARP forwarding table of the gateway and an ARP forwarding table of the switch according to the ARP of the interface address and the link topology information between the gateway and the switch, wherein an outgoing interface of the ARP forwarding table of the gateway is a tunnel port of the switch directly connected with the VNF network element, and an outgoing interface of the ARP forwarding table of the switch is an interface connected with the VNF network element;

and taking the ARP forwarding table of the gateway and the ARP forwarding table of the switch as first routing information from the gateway to the VNF network element.

5. The method of claim 4, wherein the generating routing forwarding information to at least two VNF network elements according to the dynamic routing information comprises:

generating second routing information reaching at least two VNF network elements according to the dynamic routing information, wherein the next hop of the second routing information is an interface address of the VNF network element;

and generating route forwarding information reaching at least two VNF network elements according to the second route information, the ARP table of the interface address of the VNF and the link topology information between the switches.

6. The method of any of claims 1 to 3, wherein the sending the route forwarding information to a switch comprises:

converting the routing forwarding information into a flow table;

and issuing the flow table to the switch.

7. A method for interworking network functional elements of a virtualized network, wherein the method is applied to a gateway of a Software Defined Network (SDN) networking, and the method comprises the following steps:

receiving first routing information from the gateway to a network element of a Virtual Network Function (VNF) issued by a controller;

acquiring the dynamic routing information from the VNF network element according to the first routing information, wherein the VNF network element is directly hung on the switch;

and issuing the acquired dynamic routing information to the controller.

8. The method of claim 7, wherein the obtaining the dynamic routing information from the VNF network element according to the first routing information comprises:

configuring a routing protocol matched with the VNF network element;

establishing a second neighbor relation with the VNF network element according to the first routing information and the routing protocol;

and acquiring the dynamic routing information dynamically issued by the VNF network element according to the second neighbor relation.

9. The method of claim 7, wherein the issuing the obtained dynamic routing information to the controller comprises:

converting the next hop in the dynamic routing information into an interface address of the VNF network element;

and issuing the converted dynamic routing information to the controller.

10. A network device, comprising:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of virtualized network function network element interworking as defined in any one of claims 1-6 or to perform the method of virtualized network function network element interworking as defined in any one of claims 7-9.