WO2014101394A1 - Method, device and system for transmitting message in virtual extensible local area network - Google Patents

Abstract

Disclosed are a method, device and system for transmitting a message in a virtual extensible local area network, which are applied in an OpenFlow network. When an OpenFlow switch receives a first message sent by a first virtual machine located in the OpenFlow network, a match of the first message is constructed according to information about the first message; according to the match of the first message, a first flow entry corresponding to the match of the first message is acquired; and the first message is encapsulated via virtual extensible local area network (VXLAN) encapsulation according to the first flow entry, and the encapsulated first message is sent to a second virtual machine; the first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. The problem that a VXLAN is not fully supported in an existing OpenFlow network protocol is solved.

Description

 Method, device and system for transmitting Scalable Virtual LAN message

 The embodiments of the present invention relate to the field of network technologies, and in particular, to a method, device, and system for transmitting a scalable virtual local area network message. Background technique

 OpenFlow technology enables more advanced traffic management through network access to the forwarding plane of a switch or router, especially in a virtualized environment. The core idea of OpenFlow is to transform the packet forwarding process, which is completely controlled by the switch or router, into a separate process by the OpenFlow Switch and the OpenFlow Controller. It is a technology for encapsulating Layer 2 packets with Layer 3 protocols. It can extend the Layer 2 network in Layer 3, enabling virtual machines to migrate within a three-layer network that is connected to each other without changing the Internet Protocol. (Internet Protocol, IP address) and Medium Access Control (MAC) address to ensure business continuity.

 Currently, there is no support for VXLAN in the OpenFlow network protocol, so it is not conducive to the deployment of VXLAN in the OpenFlow network. The application field of VXLAN is limited. Summary of the invention

 The embodiment of the invention provides a method, a device and a system for transmitting a scalable virtual local area network message, which are applied to an OpenFlow network, and are used to solve the problem that the existing OpenFlow network protocol does not have full support for VXLAN, which is disadvantageous to VXLAN in OpenFlow. Deployment in the network, VXLAN's application domain is limited.

 In a first aspect, the present invention provides a method for transmitting a scalable virtual local area network (LAN) packet, which is applied to an open flow network, and includes:

The OpenFlow switch receives the first packet sent by the first virtual machine located in the OpenFlow network, according to And the information of the first message constructs a match of the first message;

 Acquiring, according to the matching item of the first message, the first flow entry corresponding to the matching item of the first message;

 And the first packet is encapsulated by the first flow entry to expand the virtual local area network (VXLAN), and the encapsulated first packet is sent to the second virtual machine;

 The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines.

 Based on the first aspect, in a first implementation manner, the first flow entry corresponding to the matching item of the first message is obtained according to the matching item of the first packet, including:

 The open flow switch queries the flow table of the open flow switch, and if it is determined that the first flow entry corresponding to the matching item of the first packet is saved in the flow table, the current flow table is obtained from the flow table. The first flow entry is sent, and the matching between the first packet and the first packet is sent to the OpenFlow controller, so that the OpenFlow controller sends the first flow switch to the OpenFlow switch. The first flow entry corresponding to the match of a packet.

 Based on the first aspect and the first implementation manner of the first aspect, in the second implementation manner, the instruction of the first flow entry includes an action type of adding a VXLAN package, and the structure of the action type of the VXLAN package is added. The IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or

 The instruction of the first flow entry includes an action type of the VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located.

 In a second aspect, the present invention provides a method for transmitting a scalable virtual local area network (LAN) message, which is applied to an open flow network, and includes:

 The OpenFlow switch receives the second packet sent by the second virtual machine, and constructs a matching item of the second packet according to the information of the second packet.

 Obtaining, according to the matching item of the second message, a second flow entry corresponding to the matching item of the second message;

Decapsulating the second packet according to the second flow entry to expand the virtual local area network VXLAN encapsulation, and sending the decapsulated second packet to the first virtual machine located in the open flow network; The first virtual machine and the second virtual machine are located in different open flow switches or different objects On the machine.

 According to the second aspect, in a second implementation manner, the second flow entry corresponding to the matching item of the second message is obtained according to the matching item of the second packet, including:

 The OpenFlow switch queries the flow table of the OpenFlow switch, and if it is determined that the second flow entry corresponding to the matching item of the second packet is saved in the flow table, the flow table is obtained from the flow table. And sending, by the second flow entry, the matching item of the second packet and the second packet to the OpenFlow controller, so that the OpenFlow controller sends the information to the OpenFlow switch A second flow entry corresponding to the matching of the second packet, where the instruction of the second flow entry includes an action type of the VXLAN encapsulation.

 In a third aspect, the present invention provides a method for transmitting a scalable virtual local area network (LAN) packet, which is applied to an open flow network, and includes:

 The OpenFlow controller receives a match between the first packet sent by the OpenFlow switch and the first packet, where the first packet is sent by the OpenFlow switch to the first virtual machine that is located in the OpenFlow network. a packet, where the matching of the first packet is configured by the OpenFlow switch according to the information of the first packet;

 Acquiring, according to the matching item of the first message, the first flow entry corresponding to the matching item of the first message;

 Sending the first flow entry to the open flow switch, so that the open flow switch encapsulates the first packet according to the first flow entry to expand the virtual local area network (VXLAN) package, and the encapsulated Sending the first packet to the second virtual machine;

 The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines.

 Based on the third aspect, in a first implementation manner, the first flow entry corresponding to the matching item of the first message is obtained according to the matching item of the first packet, including:

 The OpenFlow controller queries the flow table of the OpenFlow controller, and if the first flow entry corresponding to the matching of the first packet exists, the first flow entry is obtained from the flow table. And if there is no first flow entry corresponding to the matching of the first message, the first flow entry is constructed.

According to the first implementation manner of the third aspect, in the second implementation manner, the instruction of the first flow entry includes an action type of adding a VXLAN package, where the structure of the action type added to the VXLAN package includes The IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or By

 The instruction of the first flow entry includes an action type of the VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located.

 Based on the third aspect and the first and second implementation manners of the third aspect, in a third implementation manner, the matching item with the first 4 艮 text is obtained according to the matching item of the first 艮 艮 艮After the corresponding first flow entry, it includes:

 The OpenFlow controller encapsulates the first packet according to the first flow entry to the expandable virtual local area network VXLAN encapsulation, and sends the encapsulated first packet to the second virtual machine.

 In a fourth aspect, the present invention provides a method for transmitting a scalable virtual local area network (LAN) packet, which is applied to an open flow network, and includes:

 The OpenFlow controller receives a match between the second packet and the second packet sent by the OpenFlow switch, where the second packet is the OpenFlow switch receiving the packet sent by the second virtual machine, where the The matching of the second packet is that the open flow switch is constructed according to the information of the second packet;

 Obtaining, according to the matching item of the second message, a second flow entry corresponding to the matching item of the second message;

 Sending the second flow entry to the OpenFlow switch, so that the OpenFlow switch decapsulates the second packet according to the second flow entry to expand the virtual local area network VXLAN encapsulation, The decapsulated second packet is sent to the first virtual machine located in the open flow network;

 The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines.

 According to the fourth aspect, in a first implementation manner, the second flow entry corresponding to the matching item of the second message is obtained according to the matching item of the second packet, including:

 The OpenFlow controller queries the flow table of the OpenFlow controller, and if there is a second flow entry corresponding to the matching of the second packet, the second flow is obtained from the flow table. The second flow entry is configured to be included in the second flow entry, and the second flow entry includes the de-VXLAN encapsulation Action type.

According to the fourth aspect, and the first implementation manner of the fourth aspect, in a second implementation manner, the second flow corresponding to the matching item of the second packet is obtained according to the matching item of the second packet After the entry, including: Decapsulating the second packet according to the second flow entry by the OpenFlow controller

The VXLAN encapsulation sends the decapsulated second packet to the OpenFlow switch, so that the OpenFlow switch sends the decapsulated second packet to the first virtual machine.

 According to the fourth aspect, in a third implementation manner, after the OpenFlow controller receives the matching between the second packet and the second packet sent by the OpenFlow switch, the method includes:

 The OpenFlow controller establishes a MAC address of the second virtual machine according to a MAC address of the second virtual machine included in the information of the second packet and an IP address of the VTEP where the second virtual machine is located. Correspondence between IP addresses of VTEPs where the second virtual machine is located.

 In a fifth aspect, the present invention provides a device for transmitting a virtual local area network (LAN) message, which is located on the open flow switch side and is applied to the open flow network, and includes:

 a constructing module, configured to receive a first packet sent by the first virtual machine in the open flow network, and construct a matching item of the first packet according to the information of the first packet;

 An obtaining module, configured to acquire, according to a matching item of the first packet that is configured by the building module, a first flow entry corresponding to the matching item of the first message;

 The encapsulating module is configured to encapsulate the first packet according to the first flow entry obtained by the acquiring module, and expand the virtual local area network VXLAN encapsulation, and send the encapsulated first packet to the second virtual machine;

 The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines.

 According to the fifth aspect, in a first implementation manner, the acquiring module is specifically configured to query a flow table of the open flow switch, and if it is determined that a matching item with the first packet is saved in the flow table, Corresponding the first flow entry, the first flow entry is obtained from the flow table, and the matching between the first packet and the first packet is sent to the open flow controller, so that the The OpenFlow controller sends a first flow entry corresponding to the matching of the first packet to the OpenFlow switch.

 According to the fifth aspect, the first implementation manner of the fifth aspect, in the second implementation manner, the instruction of the first flow entry includes an action type of adding a VXLAN package, and the structure of the action type of the VXLAN package is added. The IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or

The instruction of the first flow entry includes an action type of adding a VXLAN package, and the first flow table The matching item includes the IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located. In a sixth aspect, the present invention provides a device for transmitting a WLAN packet, which is located on the open flow switch side and is applied to the OpenFlow network, and includes:

 a constructing module, configured to receive a second packet sent by the second virtual machine, and construct a matching item of the second packet according to the information of the second packet;

 An acquiring module, configured to acquire, according to the matching item of the second packet, a second flow entry corresponding to the matching item of the second packet;

 a decapsulation module, configured to decapsulate the expandable virtual local area network VXLAN encapsulation of the second packet according to the second flow entry, and send the decapsulated second packet to the open flow network First virtual machine;

 The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines.

 According to the sixth aspect, in a first implementation manner, the acquiring module is specifically configured to query a flow table of the open flow switch, and if it is determined that a matching item with the second packet is saved in the flow table, Corresponding second flow entry, the second flow entry is obtained from the flow table, and the matching between the second packet and the second packet is sent to the open flow controller, And causing the OpenFlow controller to send, to the OpenFlow switch, a second flow entry corresponding to the matching item of the second packet, where the instruction of the second flow entry includes an action type of the VXLAN encapsulation .

 In a seventh aspect, the present invention provides an apparatus for transmitting a virtual local area network (LAN) packet, which is located on an open flow controller side and is applied to an open flow network, and includes:

 a receiving module, configured to receive a match between the first packet sent by the OpenFlow switch and the first packet, where the first packet is sent by the OpenFlow switch to the first virtual machine that is located in the OpenFlow network. The packet of the first packet is configured by the OpenFlow switch according to the information of the first packet;

 An acquiring module, configured to acquire, according to the matching item of the first packet, a first flow entry corresponding to the matching item of the first packet;

a sending module, configured to send the first flow entry to the open flow switch, so that the open flow switch encapsulates the first packet according to the first flow entry to expand the virtual local area network VXLAN encapsulation, The encapsulated first packet is sent to the second virtual machine; The first virtual machine and the second virtual machine are located on different open flow switches or different physical machines.

 According to the seventh aspect, in a first implementation manner, the acquiring module is specifically configured to query a flow table of the OpenFlow controller, and if there is a first flow entry corresponding to the matching item of the first packet, And acquiring the first flow entry from the flow table; if the first flow entry corresponding to the matching of the first packet does not exist, constructing the first flow entry.

 Based on the seventh aspect, and the first implementation manner of the seventh aspect, in the second implementation manner, the instruction of the first flow entry includes an action type of adding a VXLAN encapsulation, and the structure of the action type of the VXLAN encapsulation The IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or

 The instruction of the first flow entry includes an action type of the VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located.

 Based on the seventh aspect and the first and second implementation manners of the seventh aspect, in a third implementation manner, the apparatus further includes:

 The encapsulating module is configured to encapsulate the first packet with the scalable virtual local area network VXLAN encapsulation according to the first flow entry, and send the encapsulated first packet to the second virtual machine.

 In an eighth aspect, the present invention provides an apparatus for transmitting a virtual local area network (LAN) packet, which is located on an open flow controller side and is applied to an open flow network, and includes:

 a receiving module, configured to receive a matching message between the second packet and the second packet sent by the OpenFlow switch, where the second packet is the packet sent by the second virtual machine by the OpenFlow switch, where The matching item of the second packet is configured by the OpenFlow switch according to the information of the second packet;

 An acquiring module, configured to acquire, according to the matching item of the second packet, a second flow entry corresponding to the matching item of the second packet;

 a sending module, configured to send the second flow entry to the open flow switch, so that the open flow switch decapsulates the second packet according to the second flow entry to expand the virtual local area network VXLAN Encapsulating, sending the decapsulated second packet to the first virtual machine located in the open flow network;

The first virtual machine and the second virtual machine are located on different open flow switches or different physical machines. According to the eighth aspect, in a first implementation manner, the acquiring module is specifically configured to query a flow table of the OpenFlow controller, and if there is a second flow table corresponding to the matching item of the second packet, And the second flow entry is obtained from the flow table; if the second flow entry corresponding to the match of the second packet does not exist, the second flow entry is constructed. The instruction of the second flow entry includes

The action type of the VXLAN package.

 Based on the eighth aspect, and the first implementation of the eighth aspect, in the second implementation, the apparatus further includes:

 The decapsulation module is configured to decapsulate the VXLAN package from the second packet according to the second flow entry, and send the decapsulated second packet to the OpenFlow switch.

 Based on the eighth aspect, in a third implementation manner, the device further includes:

 Establishing a module, configured to establish a MAC address and a location of the second virtual machine according to a MAC address of the second virtual machine included in the information of the second packet and an IP address of the VTEP where the second virtual machine is located The correspondence between the IP addresses of the VTEPs where the second virtual machine is located.

 According to a ninth aspect, the present invention provides a transmission system for an extensible virtual local area network (LAN) packet, which is applied to an open flow network, including: an open flow switch and an open flow controller;

 The OpenFlow switch includes the transmission device of the scalable virtual local area network message according to the fifth aspect and the sixth aspect;

 The OpenFlow controller includes the transmission device of the scalable virtual local area network message described in the seventh aspect and the eighth aspect.

The embodiment of the present invention adopts a new action type (plus VXLAN encapsulation) or a new matching item on the basis of the Action type specified in the existing Open Flow protocol, so that the OpenFlow switch receives the local virtual When a packet is sent to a remote virtual machine that belongs to a VXLAN, the device obtains the corresponding flow entry based on the matching information of the packet information, and further encapsulates the VXLAN packet according to the flow entry, and encapsulates the packet. The packet is sent to the remote virtual machine, which can solve the problem that VXLAN is not supported by the existing Open Flow network protocol. This is not conducive to the deployment of VXLAN in the OpenFlow network. The application field of VXLAN is limited. The advantages of some OpenFlow protocols, under the premise of maintaining a unified mechanism, the complete support of OpenFlow for VXLAN, reducing the difficulty of VXLAN deployment in OpenFlow networks, opening up the application field of VXLAN, enriching the Open Flow protocol, Conducive to the further development of the agreement. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art description will be briefly described below, and obviously, the following description will be described. The drawings in the drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor. schematic diagram;

 2 is a schematic structural diagram of a flow entry specified by the OpenFlow protocol; a schematic diagram; a schematic diagram; a schematic diagram; a diagram;

 FIG. 8 is a schematic structural diagram of an apparatus for transmitting a scalable virtual local area network message according to another embodiment of the present invention; FIG.

 FIG. 9 is a schematic structural diagram of an apparatus for transmitting a scalable virtual local area network message according to another embodiment of the present invention;

 FIG. 10 is a schematic structural diagram of an apparatus for transmitting a scalable virtual local area network message according to another embodiment of the present invention;

 FIG. 1 is a schematic structural diagram of a device for transmitting a scalable virtual local area network message according to another embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a transmission system of an extensible virtual local area network message according to another embodiment of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

 In the following embodiments, the first virtual machine and the second virtual machine are located on different open flow switches or different physical machines, where the first virtual machine is connected to the open flow switch described in this embodiment. The second virtual machine is not connected to the open flow switch in this embodiment, and the physical machine may be an ordinary computer, a workstation, a professional server, or the like, which is not limited herein.

 The system architecture applied in the embodiments of the present invention is described below, and FIG. 7 is an embodiment of the present invention.

OpenFlow network systems include OpenFlow switches, OpenFlow controllers, and OpenFlow protocols for communication between OpenFlow switches and OpenFlow controllers. A VXLAN Tunnel End Point (VTEP) Control Plane (VTEP Control Plane) is deployed in the OpenFlow controller, and a VTEP Data Plane (VTEP Data Plane) is deployed in the OpenFlow switch.

 The following describes the types of operations of the VXLAN package and the de-VXLAN package applied in the embodiments of the present invention. Table 1 shows the structure of the action type of the VXLAN package and the VXLAN package applied in the embodiments of the present invention, as shown in Table 1. Shown as follows:

 The action type of the VXLAN encapsulation is OFP AT_PUSH_VXLAN, and the corresponding structure is ofp_action_push_vxlan or ofp_action_push. The IP address of the VTEP where the remote end is located and the external virtual local area network (VLAN) VLAN are added to the structure. The ID ID is two parameters corresponding to the external destination IP address and the external VLAN field in the VXLAN encapsulation. The external destination IP address is the outer_ip parameter in the structure of the action type of the VXLAN encapsulation in Table 1. The external VLAN field is the outer_vlan_id parameter in the structure of the action type of the VXLAN encapsulation in Table 1. In the case of a VLAN, the VLAN ID parameter of the external unit can be omitted.

The action type to go to VXLAN encapsulation is OFPAT_POP_VXLAN, and the corresponding structure is The Action structure header ofp_action_header , where ofp_action_header is the structure header of an action type defined in the openflow protocol; no additional information is required in the structure of the action type of the VXLAN encapsulation.

 It should be noted that in the structure of the action type of the VXLAN encapsulation, only the external destination IP address (outer_ip) and the ID of the external VLAN (outer_vlan_id) are added, because the information required for other VXLAN packages can be configured, The method of obtaining a table, a calculation, and the like is obtained, and the present invention does not limit this.

 Where struct represents the structure, type represents the type, Length represents the length, ethertype represents the Ethernet type, outer_ip represents the external destination IP address, outer_vlan_id represents the ID of the external VLAN, pad represents the padding, OFP_ASSERT(sizeof( Struct ofp_action_push_vxlan) == 16 indicates that the number of bytes occupied by the structure is 16 bytes. OFP_ASSERT(sizeof(struct ofp_action_header) == 8 means that the number of bytes occupied by the structure is 8 bytes. In the OpenFlow network, as shown in FIG. 1, the method for transmitting the scalable virtual local area network packet in this embodiment may include:

101. The OpenFlow switch receives the first packet sent by the first virtual machine located in the OpenFlow network. Constructing a match of the first packet according to the information of the first packet;

 The first packet includes, but is not limited to, a source MAC address, a source IP address, a destination MAC address, and a destination IP address. The first packet may be a broadcast packet, a multicast packet, an unknown unicast packet, or a known packet. Unicast message.

 Assume that the first virtual machine knows the MAC address of the second virtual machine, the first packet sent by the first virtual machine is a known unicast packet, and the information of the first packet includes the first virtual machine MAC address and the first virtual The machine IP, the second virtual machine MAC address, and the second virtual machine IP; if the first virtual machine does not know the MAC address of the second virtual machine, the first packet sent by the first virtual machine is a broadcast packet, which may be The address resolution protocol (ARP) request message includes the first virtual machine MAC address, the first virtual machine IP, the broadcast MAC address, and the second virtual machine IP.

 In this embodiment, the matching item of the first message includes the information of the first message, and further, the matching of the first message further includes the port of the first port. information.

 Obtaining, by the matching item of the first packet, a first flow entry corresponding to the matching item of the first packet;

 For example, the flow table is pre-configured to store the flow entries that are not expired. Figure 2 shows the structure of the flow entries specified in the OpenFlow protocol. As shown in Figure 2, the flow entries are usually The matching item includes a matching item, a priority, a counter, an instruction, and a timeout, where the matching item includes packet information, and is used to match the corresponding flow entry. The priority indicates the matching priority of the flow entry. The counter counts the number of packets matching the flow entry. The instruction includes an action or action set (English: Action or Action Set). Further, the instruction may further include information such as a flow table of the next level query. The timeout indicates the expiration time of the flow entry in the open flow switch. Generally, the most important one in a flow entry is the match and the instruction. It is also the key to implementing the normal forwarding of packets in the OpenFlow network.

 Further, the open flow switch may query the flow table of the open flow switch according to the matching item of the first packet, and if it is determined that the first flow entry corresponding to the matching item of the first packet is saved in the flow table, Obtaining the first flow entry in the flow table, and sending a matching event between the first packet and the first packet to an open flow controller, so that the open flow controller is open to the The flow switch sends a first flow entry corresponding to the matching of the first packet.

103. Encapsulate the first packet according to the first flow entry to expand the virtual local area network. The VXLAN encapsulation sends the encapsulated first packet to the second virtual machine.

 The first virtual machine is located in the OpenFlow network, and the first virtual machine sends the first packet to the VXLAN encapsulation. In order to successfully send the first packet to the remote second virtual machine, the specific implementation time is implemented. :

 For example, based on the Action type specified in the existing OpenFlow protocol, a new Action type is added, wherein the added Action type includes a VXLAN package, and the VXLAN package is OFPAT_PUSH_VXLAN, where the action type of the VXLAN package is added. The structure includes, but is not limited to, the VTEP IP address and the external VLAN ID of the remote end, which correspond to the external destination IP and external VLAN fields in the VXLAN encapsulation. For the case where an external VLAN is not required to be set, the external VLAN ID parameter can be omitted.

 Therefore, the action type in the instruction of the first flow entry is a VXLAN encapsulation, and the VXLAN encapsulated structure includes the IP address of the VTEP where the second virtual machine is located. Correspondingly, the OpenFlow switch encapsulates the first packet with the VXLAN encapsulation according to the action type (adding VXLAN encapsulation) in the instruction of the first flow entry, and sends the encapsulated first packet to the second virtual machine.

 For example, based on the Action type specified in the existing OpenFlow protocol, a new Action type and a new match are added, wherein the added Action type includes a VXLAN encapsulation, wherein the action type of the VXLAN encapsulation is added. The structure can use the existing generic structure ofp_action_push for the header in the existing OpenFlow protocol. The new match OXM_OF_OUTER_IP is used to indicate the IP address of the VTEP where the remote end is located.

 Therefore, the instruction of the first flow entry includes a VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VTEP where the second virtual machine is located. Correspondingly, the open flow switch is configured according to the action type (plus VXLAN encapsulation) included in the instruction of the first flow entry and the IP address of the VTEP where the second virtual machine included in the matching of the first flow entry is located, The encapsulation VXLAN encapsulation sends the encapsulated first packet to the second virtual machine.

The embodiment of the present invention adopts a new action type (plus VXLAN encapsulation) or a new matching item on the basis of the Action type specified in the existing OpenFlow protocol, so that the OpenFlow switch receives the local virtual machine. When a packet is sent to the remote VM, the corresponding entry is obtained based on the matching of the packet information. The packet is encapsulated in the VXLAN according to the flow entry, and the encapsulated packet is sent to the remote device. End virtual machine, which can solve existing OpenFlow network There is no support for VXLAN in the protocol, which is not conducive to the deployment of VXLAN in OpenFlow network, and the application field of VXLAN is limited. The advantages of the existing OpenFlow protocol can be fully utilized, and the unified mechanism is implemented. OpenFlow's full support for VXLAN reduces the difficulty of deploying VXLAN in OpenFlow networks, opens up the application field of VXLAN, and enriches the OpenFlow protocol, which is conducive to the further development of the protocol. The schematic diagram is applied to the OpenFlow network. As shown in Figure 3, it includes:

 301. The OpenFlow switch receives the second packet sent by the second virtual machine, and constructs a matching event of the second packet according to the information of the second packet.

 The information of the second packet includes, but is not limited to, a source MAC address, a source IP address, a destination MAC address, and a destination IP address. The second packet may be a broadcast packet, a multicast packet, an unknown unicast packet, or a known list. Broadcast message.

 Assuming that the second virtual machine knows the MAC address of the first virtual machine, and the source MAC address, the source IP address, the destination MAC address, and the destination IP address included in the information of the second virtual machine sent by the second virtual machine to the first virtual machine; The source MAC is the second virtual machine MAC address, the source IP is the second virtual machine IP, the destination MAC address is the first virtual machine MAC address, and the destination IP is the first virtual machine IP.

 In this embodiment, the matching item of the second message includes the information of the second message, and further, the matching of the second message further includes the entry of the second message. Port information.

 302. Acquire, according to the matching item of the second packet, a second flow entry corresponding to the matching item of the second packet.

 Specifically, the OpenFlow switch may query the flow table of the OpenFlow switch according to the matching item of the second packet, and if it is determined that the second flow entry corresponding to the matching item of the second packet is saved in the flow table, Obtaining the second flow entry from the flow table, and sending a matching event between the second packet and the second packet to an open flow controller, so that the open flow controller is located The OpenFlow switch sends a second flow entry corresponding to the matching of the second packet.

 303. Decapsulate the expandable virtual local area network VXLAN encapsulation of the second packet according to the second flow entry, and send the decapsulated second packet to the first virtual located in the open flow network. Machine

Since the second message sent by the second virtual machine is sealed with a VXLAN package, in order to be able to smoothly The second packet is sent to the first virtual machine located outside the OpenFlow network.

 For example, based on the Action type specified in the existing OpenFlow protocol, a new Action type is added, wherein the newly added Action type includes a VXLAN encapsulation OFTAT_POP_VXLAN, wherein the structure of the action type of the VXLAN encapsulation can be It does not include any information, and the structure of the action type that goes to the VXLAN encapsulation can be the Action structure header specified by the existing OpenFlow protocol.

 Therefore, the action type in the instruction of the second flow entry is a de-VXLAN encapsulation, and correspondingly, the OpenFlow switch decapsulates the VXLAN encapsulation of the second packet according to the action type (de-VXLAN encapsulation) in the instruction of the second flow entry. And sending the decapsulated second message to the first virtual machine located in the open flow network.

 The embodiment of the present invention adds a technical means for removing the action type of the VXLAN encapsulation based on the Action type specified in the existing OpenFlow protocol, so that the OpenFlow switch receives the remote virtual machine and sends it to the local virtual machine. When the packet encapsulated by the VXLAN is encapsulated, the corresponding flow entry is obtained according to the matching item constructed by the packet information, and further, the VXLAN encapsulation is decapsulated according to the de-VXLAN encapsulation in the flow entry, and then The OpenFlow switch sends the decapsulated packet to the virtual machine located in the OpenFlow network. It can solve the problem that the existing OpenFlow network protocol does not have full support for VXLAN, which is not conducive to VXLAN deployment in the OpenFlow network. VXLAN The application domain is limited; the advantages of the existing OpenFlow protocol can be fully utilized, and the complete support of VXLAN by OpenFlow is realized under the premise of maintaining the unified mechanism, which reduces the difficulty of deploying VXLAN in the OpenFlow network. The application field of VXLAN enriches the OpenFlow protocol, which is conducive to the further development of the protocol.The schematic diagram is applied to the OpenFlow network, as shown in Figure 4, including:

 401. The OpenFlow controller receives a match between the first packet sent by the OpenFlow switch and the first packet.

 The first packet is that the OpenFlow switch receives the packet sent by the first virtual machine in the local OpenFlow network, and the matching item of the first packet is the OpenFlow switch according to the A message is constructed from the information.

402. Acquire, according to the matching item of the first packet, a matching item corresponding to the first packet. First flow entry;

 Specifically, it is assumed that the open flow controller is pre-configured with a flow table, and the flow table stores the flow entry that is not expired, and the open flow controller queries the flow table according to the matching item of the first packet, if If the first flow entry corresponding to the match of the message is obtained, the first flow entry is obtained from the flow table; if there is no first flow entry corresponding to the match of the first message, Constructing the first flow entry. When the specific implementation:

 For example, when the OpenFlow controller does not complete the address learning for the VXLAN, and does not establish a correspondence between the identifier address of the second virtual machine and the IP address of the VTEP where the second virtual machine is located, as shown in FIG. 7, in the open flow A VTEP control plane is deployed in the controller, and a VXLAN VNI-multicast address correspondence table is pre-configured in the VTEP control layer, and the OpenFlow controller determines the MAC address and IP address of the first virtual machine included in the information of the first packet. The VXLAN VNI-multicast address mapping table is used to obtain the multicast address corresponding to the VXLAN to which the first virtual machine belongs, and the obtained multicast address is used as the IP address of the VTEP where the second virtual machine is located. The identification address includes a MAC address and an IP address of the second virtual machine.

 For another example, when the OpenFlow controller has completed the address learning of the VXLAN and establishes a correspondence between the identifier address of the second virtual machine and the IP address of the VTEP where the second virtual machine is located, the OpenFlow controller directly according to the second The MAC address of the virtual machine acquires the IP address of the VTEP where the second virtual machine is located; wherein the identifier address of the second virtual machine includes the MAC address and the IP address of the second virtual machine.

The first virtual machine is located in the local area of the open flow switch, and the first virtual file sent by the first virtual machine is not encapsulated with a VXLAN encapsulation. In order to successfully send the first packet to the remote second virtual machine, In an optional implementation manner, a new Action type is added on the basis of the Action type specified in the existing OpenFlow protocol, where the added Action type includes adding a VXLAN package OFTAT_PUSH_VXLAN, wherein the structure of the VXLAN package is added. The parameters include the IP address of the VTEP and the external VLAN ID of the remote end, which correspond to the external destination IP and external VLAN fields in the VXLAN encapsulation. For the case where an external VLAN is not required to be set, the external VLAN ID parameter can be omitted. Therefore, the action type in the instruction of the first flow entry constructed by the OpenFlow controller is a VXLAN encapsulation, and the IP address of the VTEP where the second virtual machine is located is added to the force. In the outer_ip parameter in the structure of the VXLAN package, outer_ip represents the external destination IP. In another optional implementation manner, a new Action type and a new matching item are added on the basis of the Action type specified in the existing OpenFlow protocol, and the added Action type includes a VXLAN encapsulation. The structure added with the VXLAN package can use the existing general structure of the existing OpenFlow protocol for the header, wherein the general structure of the OpenFlow protocol for force verbal is ofp_action_push. The new match OXM_OF_OUTER_IP is used to indicate the IP address of the VTEP where the remote end is located. Therefore, the instruction of the first flow entry that is configured by the open flow controller includes adding a VXLAN encapsulation, and adding the IP address of the VTEP where the second virtual machine is located to the matching entry of the first flow entry.

 403. Send the first flow entry to the open flow switch.

 Correspondingly, the OpenFlow switch encapsulates the first packet with the scalable virtual LAN VXLAN encapsulation according to the first flow entry, and sends the encapsulated first packet to the second virtual machine.

 Optionally, the OpenFlow controller encapsulates the first packet with the scalable virtual local area network VXLAN encapsulation according to the first flow entry, and sends the encapsulated first packet to the second virtual machine.

 The embodiment of the present invention adopts the action type specified in the existing OpenFlow protocol, and adds a technical means for adding the action type and the new matching item of the VXLAN encapsulation, so that the OpenFlow controller sends the report according to the OpenFlow switch. And the matching item, constructing or determining a flow entry corresponding to the matching item, and sending the flow entry to the OpenFlow switch, so that the OpenFlow switch adds the VXLAN included in the flow entry sent by the OpenFlow controller. The encapsulation action type encapsulates the packet into the VXLAN encapsulation and sends the encapsulated packet to the remote virtual machine. It can solve the problem that the existing OpenFlow network protocol does not have full support for VXLAN, which is not conducive to VXLAN in the OpenFlow network. In the deployment, VXLAN's application domain is limited; the advantages of the existing OpenFlow protocol can be fully utilized, and OpenFlow's full support for VXLAN is achieved under the premise of maintaining a unified mechanism, which reduces the deployment of VXLAN in the OpenFlow network. Difficulty, opened up the application field of VXLAN, enriched the OpenFlow protocol, and facilitated the agreement. Further development. Schematic diagram; applied to the OpenFlow network, as shown in Figure 5, including:

 501. The OpenFlow controller receives a match between the second packet sent by the open flow switch and the second packet.

The second packet is a packet sent by the OpenFlow switch to the second virtual machine. The matching item of the second packet is configured by the OpenFlow switch according to the information of the second packet. Since the second packet is sent by the second virtual machine located at the remote end, the second packet is encapsulated with a VXLAN encapsulation.

 Optionally, the open flow controller may obtain the IP address of the VTEP where the second virtual machine is located according to the VXLAN encapsulation of the second packet, and obtain the MAC address of the second virtual machine according to the information of the second packet, and establish the first Corresponding relationship between the identifier address of the second virtual machine and the IP address of the VTEP where the second virtual machine is located, thereby completing the address learning process of the VXLAN; wherein the identifier address of the second virtual machine includes the second virtual machine MAC address and IP address.

 502. Obtain, according to the matching item of the second packet, a second flow entry corresponding to the matching item of the second packet.

 The open flow controller queries the flow table of the open flow controller, and if there is a second flow entry corresponding to the matching of the second packet, the second flow entry is obtained from the flow table. ;

 If the second flow entry corresponding to the matching of the second packet does not exist, the second flow entry is constructed. Specific implementation:

 The second virtual machine sends the second virtual machine with the VXLAN encapsulation. In order to successfully send the second packet to the first virtual machine local to the open flow switch, in an optional implementation manner, Based on the Action type specified in the existing OpenFlow protocol, a new Action type is added. The new Action type includes a VXLAN encapsulation. The structure corresponding to the action type of the VXLAN encapsulation may not include any information. Moreover, the structure to the VXLAN package can be the Action structure header specified by the existing OpenFlow protocol. Therefore, the action type in the instruction of the second flow entry constructed by the OpenFlow controller is de-VXLAN encapsulation.

 503. Send the second flow entry to the open flow switch.

 Correspondingly, the OpenFlow switch decapsulates the expandable virtual local area network (VXLAN) encapsulation of the second packet according to the second flow entry, and sends the decapsulated second packet to the open flow network. The first virtual machine.

 Optionally, the OpenFlow controller may perform the VXLAN encapsulation according to the action type included in the second flow entry obtained in step 502, and decapsulate the VXLAN encapsulation of the second packet, and the decapsulated second report. The message is sent to the OpenFlow switch, so that the OpenFlow switch sends the decapsulated second packet to the first virtual machine.

The embodiment of the present invention adopts the basis of the Action type specified in the existing OpenFlow protocol. In the above, a new method for the action type of the VXLAN encapsulation is added, so that the OpenFlow controller constructs or determines a flow entry corresponding to the matching item according to the matching item sent by the OpenFlow switch, and sends the flow entry to the open The flow switch is configured to decapsulate the VXLAN encapsulation of the packet according to the de-VXLAN encapsulation included in the flow entry sent by the OpenFlow controller, and send the decapsulated packet to the local virtual machine. It can solve the problem that the existing OpenFlow network protocol does not have full support for VXLAN, which is not conducive to the deployment of VXLAN in the OpenFlow network, and the application field of VXLAN is limited; the advantages of the existing OpenFlow protocol can be fully utilized, Under the premise of the unified mechanism, OpenFlow fully supports VXLAN, which reduces the difficulty of VXLAN deployment in OpenFlow network, opens up the application field of VXLAN, and enriches the OpenFlow protocol, which is conducive to the further development of the protocol. FIG. 7 is a system architecture diagram of an application method for transmitting a scalable virtual local area network according to an embodiment of the present invention; as shown in FIG. 6 and FIG. 7, the method includes:

 601. The OpenFlow switch receives an address resolution protocol ARP request packet sent by the virtual machine VM-1. As shown in Figure 7, the OpenFlow network system includes an OpenFlow switch, an OpenFlow controller, and an OpenFlow protocol for communication between the OpenFlow switch and the OpenFlow controller. The VTEP control plane is deployed in the OpenFlow controller, and the VTEP data plane is deployed in the OpenFlow switch; VM-1 and VM-3 belong to the same VXLAN; VTEP and VM-3 to which VM-1 belongs The VTEP is different.

 Generally, before VM-1 communicates with VM-3, if VM-1 does not know the MAC address of VM-3, VM-1 needs to obtain the MAC address of VM-3 through ARP request message. At this time, the VM-1 broadcasts the ARP request message, and the ARP request includes the sender MAC address and the IP address, and the destination IP address, wherein the destination IP address is the IP address of the VM-3, and the sender MAC address. For the MAC address of VM-1, the IP address of the sender is the IP address of VM-1.

 602. The OpenFlow switch sends the matching entry of the ARP request packet and the ARP request packet to the OpenFlow controller.

The OpenFlow switch constructs a matching entry of the ARP request packet according to the information of the ARP request packet, and queries the flow entry that is cached in the local flow table to determine that there is no flow entry corresponding to the matching item, and then the ARP request packet is sent. And a match of the ARP request message is sent to the OpenFlow controller. 603. The OpenFlow controller constructs a flow entry corresponding to the matching of the ARP request.

 After receiving the match between the ARP request packet and the ARP request packet, the OpenFlow controller matches again in the flow table of the OpenFlow controller. A matching flow entry cannot be found. In this case, the open flow controller constructs a flow entry corresponding to the match of the ARP request. Specific implementation:

 According to the matching of the ARP request message, the OpenFlow controller sends an ARP request from the local VM-1 to the remote VM-3. Therefore, the actions included in the instruction of the constructed flow entry are OFPAT_PUSH_VXLAN and OFPAT_OUTPUT. . As shown in Figure 7, the VTEP control plane is deployed in the OpenFlow controller, and the VXLAN VNI-Multicast address mapping table is pre-configured in the VTEP control plane. Therefore, the OpenFlow controller looks up the VXLAN VNI-Multicast address mapping table. The multicast address corresponding to the VXLAN to which the VM-1 belongs is obtained as the VTEP IP address to which the peer (VM-3) in the OFTAT_PUSH_VXLAN structure belongs, and the VTEP IP address to which the VM-3 belongs is added to the OFPAT_PUSH_VXLAN structure.

 604. The OpenFlow controller sends the constructed flow entry to the OpenFlow switch.

 Optionally, the OpenFlow controller can directly encapsulate the ARP request packet in the VXLAN encapsulation according to the instruction in the configured flow entry, and then send the encapsulated ARP request packet.

 605. The OpenFlow switch sends the ARP request packet to the VXLAN encapsulation according to the instruction in the flow entry sent by the OpenFlow controller.

 Optionally, the OpenFlow switch can cache the flow entry sent by the OpenFlow controller to the flow table of the OpenFlow switch.

 606. The OpenFlow switch receives the ARP reply packet encapsulated with the VXLAN encapsulation returned from the VM-3.

 When the remote VM-3 receives the ARP request packet broadcasted by the VM-1, it is determined that the VM-1 needs to communicate with the VM-3. At this time, the VM-3 may return an ARP response packet to the VM-1. The ARP response packet is encapsulated in a VXLAN encapsulation.

 607. The OpenFlow switch sends a matching entry between the ARP reply packet and the ARP reply packet encapsulated by the VXLAN to the OpenFlow controller.

After receiving the ARP reply packet encapsulated with the VXLAN encapsulation sent from the VM-3, the OpenFlow switch extracts the ARP response information in the VXLAN encapsulation to construct a matching entry of the ARP response message, and passes the open flow. The flow entry cached in the flow table of the switch. If it is determined that it does not exist with ARP. The flow entry corresponding to the match of the response packet sends a matching entry of the ARP reply packet and the ARP reply packet encapsulated in the VXLAN to the OpenFlow controller.

 608. The OpenFlow controller constructs a flow entry corresponding to the match of the ARP response message.

 The actions included in the instruction of the flow table entry constructed by the OpenFlow controller according to the matching of the ARP reply message are OFPAT_POP_VXLAN and OFPAT_OUTPUT.

 Optionally, the OpenFlow controller establishes the MAC address of the VM-3 and the VM-3 according to the MAC address of the VM-3 included in the ARP response and the IP address of the VTEP to which the VM-3 included in the VXLAN package belongs. Correspondence between the IP addresses of the VTEPs, and the correspondence between the MAC address of the VM-3 and the IP address of the VTEP to which the VM-3 belongs is stored in the VM MAC-VTEP IP correspondence table to complete the VXLAN address learning. process.

 609. The OpenFlow controller sends the constructed flow entry to the OpenFlow switch.

 610. The OpenFlow switch decapsulates the ARP reply packet according to the instruction in the flow entry sent by the OpenFlow controller, and sends the decapsulated ARP reply packet to the VM-1.

 Specifically, the OpenFlow switch receives the flow entry sent by the OpenFlow controller, where the Action included in the instruction of the flow entry is OFPAT_POP_VXLAN and OFPAT_OUTPUT, and the OFPAT_POP_VXLAN has no information in the structure. The OpenFlow switch decapsulates the VXLAN encapsulation of the ARP reply packet according to the OFPAT_POP_VXLAN, and sends the decapsulated ARP reply packet to VM-1 according to the structure of the OFPAT_OUTPUT.

 Optionally, the OpenFlow switch receives the flow entry sent by the OpenFlow controller, and the flow entry can be cached in the flow table of the OpenFlow switch.

 611. The OpenFlow switch receives the unicast packet sent by the VM-1.

 When VM-1 receives the ARP reply message returned by VM-3, the MAC address of VM-3 can be obtained. After that, VM-1 can send a unicast message to VM-3.

 612. The OpenFlow switch sends the matching between the unicast packet and the unicast packet to the OpenFlow controller. When the OpenFlow switch receives the unicast packet sent by the VM-1 to the VM-3, it constructs a unicast packet match according to the unicast packet information, and queries whether there is a matching in the flow entry cached in the OpenFlow switch flow table. A flow entry, assuming that the cached matching flow entry expires, the matching flow entry cannot be determined. The OpenFlow switch can send the match between the unicast packet and the unicast packet to the OpenFlow controller.

613. The OpenFlow controller constructs a flow entry according to a match of the unicast packet. The open flow controller queries the flow table of the open flow controller according to the matching item of the unicast packet sent by the open flow switch, and if yes, sends the flow entry to the open flow switch. If the corresponding flow entry does not exist, the flow entry corresponding to the match of the unicast packet is configured, specifically:

 According to the match of the unicast message, the OpenFlow controller sends a unicast message from the local VM-1 to the remote VM-3. Therefore, the actions included in the instruction of the constructed flow entry are OFPAT_PUSH_VXLAN and OFPAT_OUTPUT. The IP address of the VTEP to which the VM-3 belongs is obtained by looking up the VM MAC-VTEP IP correspondence table established by the OpenFlow controller, and the IP address of the VTEP to which the VM-3 belongs is filled in the outer_ip parameter of the OFPAT_PUSH_VXLAN structure.

 614. The OpenFlow controller sends the constructed flow entry to the OpenFlow switch.

 615. The OpenFlow switch encapsulates the unicast packet in the VXLAN encapsulation according to the instruction in the flow entry sent by the OpenFlow controller, and sends the encapsulated unicast packet to the VM-3.

 Optionally, the OpenFlow switch can cache the flow entry sent by the OpenFlow controller into the flow table. Further, when the OpenFlow switch receives the unicast packet encapsulated with the VXLAN encapsulation sent by the VM-3 to the VM-1, the corresponding matching item is constructed according to the information of the unicast packet encapsulated with the VXLAN encapsulation. First, the flow entry that is cached in the OpenFlow switch flow table matches whether the corresponding flow entry exists. If not, the unicast packet encapsulated with the VXLAN encapsulation and its corresponding matching entry are sent to the OpenFlow controller.

 The OpenFlow controller searches for the corresponding flow entry in the flow table of the OpenFlow controller according to the unicast packet encapsulated with the VXLAN encapsulation and the corresponding matching item. If yes, the matching flow entry is directly sent to the flow entry. Open flow switch; if it does not exist, construct a new flow entry. The action included in the new flow entry is OFTAT_POP_VXLAN and OFPAT_OUTPUT, and send the newly created flow entry to the OpenFlow switch.

 The open flow switch can cache the newly created flow entry, and the VXLAN encapsulation of the unicast packet is decapsulated according to the action in the newly created flow entry, and the decapsulated unicast packet is sent to the VM-1.

Through the embodiment shown in FIG. 6, the corresponding flow entry is established for the unicast communication between VM-1 and VM-3, and is cached in the open flow switch. If the OpenFlow switch receives the unencapsulated VXLAN encapsulation or the encapsulated VXLAN encapsulation packet when the unicast communication is again unicast between VM-1 and VM-3, the flow table cached in the flow table of the OpenFlow switch can be cached. Find the matching flow entry in the item, and The matched packets in the matching flow entry are encapsulated in a VXLAN encapsulation or decapsulation VXLAN encapsulation and forwarded.

 In the embodiment of the present invention, based on the Action type specified in the existing OpenFlow protocol, a technical means of adding an action type (plus VXLAN encapsulation and de-VXLAN encapsulation) is added, so that the OpenFlow controller sends a match according to the OpenFlow switch. The item constructs or determines a flow entry corresponding to the match, and sends the flow entry to the OpenFlow switch, so that the OpenFlow switch encapsulates the VXLAN according to an instruction in the flow entry sent by the OpenFlow controller. Encapsulate or decapsulate the VXLAN package, and send the encapsulated VXLAN package or unpack the VXLAN encapsulated packet to the remote virtual machine or the local virtual machine; it can solve the problem that the existing OpenFlow network protocol does not have full support for VXLAN. It is not conducive to the deployment of VXLAN in the OpenFlow network, and the application field of VXLAN is limited. The advantages of the existing OpenFlow protocol can be fully utilized, and the OpenFlow support for VXLAN is fully realized under the premise of maintaining the unified mechanism. The difficulty of deploying VXLAN in OpenFlow network has opened up the application field of VXLAN. The OpenFlow protocol, is conducive to the further development of the agreement.

 FIG. 8 is a schematic structural diagram of an apparatus for transmitting an extensible virtual local area network (LAN) packet according to another embodiment of the present invention; and is located in an open flow network, and is applied to an open flow network, as shown in FIG. The first packet sent by the first virtual machine is received, and the matching item of the first message is constructed according to the information of the first packet;

 The obtaining module 82 is configured to obtain, according to the matching item of the first packet that is configured by the building module, a first flow entry corresponding to the matching item of the first packet;

 The encapsulating module 83 is configured to encapsulate the first packet with the first virtual flow entry, and the encapsulated first virtual packet is sent to the second virtual machine according to the first flow entry obtained by the acquiring module;

 For example, the obtaining module 82 is specifically configured to query a flow table of the OpenFlow switch, and if it is determined that the flow table has a first flow entry corresponding to the matching item of the first packet, Obtaining the first flow entry in the flow table, and sending a match between the first packet and the first packet to an open flow controller, so that the open flow controller is to the open flow The switch sends a first flow entry corresponding to the matching of the first packet.

The instruction of the first flow entry includes an action type of adding a VXLAN package, and the adding The structure of the action type of the VXLAN package includes the IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or

 The instruction of the first flow entry includes an action type of the VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located.

 For example, the constructing module 81 is further configured to receive a second packet sent by the second virtual machine, and construct a matching item of the second packet according to the information of the second packet.

 The obtaining module 82 is further configured to: obtain, according to the matching item of the second packet, a second flow entry corresponding to the matching item of the second packet;

 The device also includes:

 The decapsulation module 84 is configured to decapsulate the expandable virtual local area network VXLAN encapsulation of the second packet according to the second flow entry, and send the decapsulated second packet to the first virtual machine;

 For example, the obtaining module 82 is further configured to query a flow table of the OpenFlow switch, and if it is determined that the flow table has a second flow entry corresponding to the matching item of the second packet, Obtaining the second flow entry from the flow table, and sending a matching event between the second packet and the second packet to an open flow controller, so that the open flow controller is located The OpenFlow switch sends a second flow entry corresponding to the matching of the second packet.

 The instruction of the second flow entry includes an action type of the VXLAN encapsulation.

 The embodiment of the present invention adopts a technical method of adding an action type (plus VXLAN encapsulation and de-VXLAN encapsulation) or a new matching item based on the Action type specified in the existing OpenFlow protocol, so that the OpenFlow switch receives the The packet information is constructed to match, the corresponding flow entry is obtained according to the matching item, and the VXLAN encapsulation or decapsulation VXLAN encapsulation is further encapsulated according to the instruction in the flow entry, and the VXLAN encapsulation or decapsulation VXLAN encapsulation is sent. The subsequent packets are sent to the remote virtual machine or the local virtual machine. It can solve the problem that the existing OpenFlow network protocol does not have full support for VXLAN, which is not conducive to the deployment of VXLAN in the OpenFlow network. The application domain of VXLAN is limited. Can fully utilize the advantages of the existing OpenFlow protocol, complete the OpenFlow support for VXLAN under the premise of maintaining a unified mechanism, reduce the difficulty of deploying VXLAN in OpenFlow network, and expand the application field of VXLAN, enriching The OpenFlow protocol facilitates the further development of the protocol.

FIG. 9 is a schematic diagram of a device for transmitting a scalable virtual local area network message according to another embodiment of the present invention; The schematic diagram is located on the open flow controller side and is applied to the open flow network. As shown in FIG. 9, the method includes: a receiving module 91, configured to receive a match between the first packet sent by the OpenFlow switch and the first packet. The first packet is that the OpenFlow switch receives the packet sent by the first virtual machine, and the matching item of the first packet is configured by the OpenFlow switch according to the information of the first packet. ;

 The obtaining module 92 is configured to obtain, according to the matching item of the first packet, a first flow entry corresponding to the matching of the first packet;

 The sending module 93 is configured to send the first flow entry to the open flow switch, so that the open flow switch encapsulates the first packet according to the first flow entry, and the expandable virtual local area network (VXLAN) is encapsulated. Sending the encapsulated first packet to the second virtual machine;

 For example, the obtaining module 92 is configured to query the flow table of the OpenFlow controller, and if there is a first flow entry corresponding to the matching item of the first packet, obtain the current flow table from the flow table. The first flow entry is configured; if the first flow entry corresponding to the matching of the first packet does not exist, the first flow entry is constructed.

 The instruction of the first flow entry includes an action type of adding a VXLAN encapsulation, and the structure of the action type of the VXLAN encapsulation includes an IP address of a VXLAN tunnel endpoint VTEP where the second virtual machine is located; or

 The instruction of the first flow entry includes an action type of the VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located.

 The device also includes:

 The encapsulating module 94 is configured to encapsulate the first packet with the expandable virtual local area network VXLAN encapsulation according to the first flow entry, and send the encapsulated first packet to the second virtual machine.

 For example, the receiving module 91 is further configured to receive a matching between the second packet sent by the OpenFlow switch and the second packet, where the second packet is received by the OpenFlow switch. a packet sent by the second virtual machine, where the matching of the second packet is configured by the OpenFlow switch according to the information of the second packet;

 The obtaining module 92 is configured to obtain, according to the matching item of the second packet, a second flow entry corresponding to the matching item of the second packet;

The sending module 93 is configured to send the second flow entry to the open flow switch, so that the open flow switch decapsulates the second packet according to the second flow entry to expand the virtual local area network. The VXLAN encapsulation sends the decapsulated second packet to the first virtual machine.

 The obtaining module 92 is further configured to query the flow table of the OpenFlow controller, and if there is a second flow entry corresponding to the matching item of the second packet, obtain the current flow table from the flow table. The second flow entry is configured; if the second flow entry corresponding to the matching of the second packet does not exist, the second flow entry is constructed.

 The instruction of the second flow entry includes an action type of the VXLAN encapsulation.

 For example, the device further includes: a decapsulation module 95, configured to decapsulate the VXLAN encapsulation according to the second flow entry, and decapsulate the decapsulated second The message is sent to the OpenFlow switch.

 For example, the device further includes: an establishing module 96, configured to: according to the information about the second virtual machine included in the information of the second packet received by the receiving module 91, the VTEP of the second virtual machine The IP address establishes a correspondence between a MAC address of the second virtual machine and an IP address of the VTEP where the second virtual machine is located.

The embodiment of the present invention adopts the action type specified in the existing Open Flow protocol, and adds a technical means of adding an action type (plus VXLAN encapsulation and de-VXLAN encapsulation) or a new matching item, so that the open flow controller is based on The matching item sent by the OpenFlow switch constructs or determines a flow entry corresponding to the matching item, and sends the flow entry to the OpenFlow switch, so that the OpenFlow switch according to the instruction pair in the flow entry sent by the OpenFlow controller The message is encapsulated in a VXLAN package or decapsulated in a VXLAN package, and the VXLAN encapsulated or unsealed VXLAN encapsulated packet is sent to the remote virtual machine or the local virtual machine; the existing OpenFlow network protocol can be solved without VXLAN. Full support, which is not conducive to VXLAN deployment in OpenFlow network, VXLAN application limited problem; can take full advantage of the existing OpenFlow protocol, under the premise of maintaining a unified mechanism, OpenFlow to VXLAN Full support, reducing the difficulty of VXLAN deployment in OpenFlow network, opening up the application field of VXLAN, enriching The OpenFlow protocol facilitates the further development of the protocol. FIG. 10 is a schematic structural diagram of a device for transmitting a scalable virtual local area network (LAN) packet according to another embodiment of the present invention; specifically, an open flow switch is applied to an open flow network, as shown in FIG. 10, the open flow switch specifically includes: a processor, a memory, and a communication bus, wherein the processor is connected to the memory through a communication bus, and the memory stores instructions for implementing a transmission method of the scalable virtual local area network message. Further, the open flow switch specifically includes a communication interface, and the communication The interface communicates with other network element devices, such as an OpenFlow controller.

 When the processor retrieves instructions from memory, the following steps are performed:

 Receiving a first packet sent by the first virtual machine, and constructing a matching item of the first text according to the information of the first packet;

 Obtaining, according to the matching item of the first packet that is configured by the building module, the first flow entry corresponding to the matching item of the first packet;

 Encapsulating the first packet according to the first flow entry obtained by the acquiring module, and expanding the virtual local area network VXLAN encapsulation, and sending the encapsulated first packet to the second virtual machine;

 For example, the first flow entry corresponding to the matching of the first packet is obtained according to the matching of the first packet that is configured by the building module, and includes:

 Querying the flow table of the open flow switch, if it is determined that the first flow entry corresponding to the matching of the first packet is saved in the flow table, obtaining the first flow entry from the flow table And sending a match between the first packet and the first packet to the OpenFlow controller, so that the OpenFlow controller sends a match with the first packet to the OpenFlow switch. The first flow entry corresponding to the item.

 The instruction of the first flow entry includes an action type of adding a VXLAN encapsulation, and the structure of the action type of the VXLAN encapsulation includes an IP address of a VXLAN tunnel endpoint VTEP where the second virtual machine is located; or

 The instruction of the first flow entry includes an action type of the VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located.

 When the processor retrieves instructions in memory, it also performs the following steps:

 Receiving a second packet sent by the second virtual machine, and constructing a matching item of the second text according to the information of the second packet;

 Obtaining, according to the matching item of the second message, a second flow entry corresponding to the matching item of the second message;

 Decapsulating the second packet according to the second flow entry to expand the virtual local area network (VXLAN), and sending the decapsulated second message to the first virtual machine;

 For example, the second flow entry corresponding to the matching of the second packet is obtained according to the matching item of the second packet that is configured by the building module, and includes:

Querying a flow table of the open flow switch, if it is determined that the flow table is saved with the second packet The second flow entry corresponding to the matching item, the second flow entry is obtained from the flow table, and the matching between the second packet and the second packet is sent to the open flow control. And the second flow entry corresponding to the matching of the second packet is sent by the open flow controller to the open flow switch.

 The instruction of the second flow entry includes an action type of the VXLAN encapsulation.

 In the embodiment of the present invention, based on the Action type specified in the existing OpenFlow protocol, a new type of action type (plus VXLAN encapsulation and de-VXLAN encapsulation) or a new matching item is added, so that the OpenFlow switch receives the The packet information is constructed to match, the corresponding flow entry is obtained according to the matching item, and the VXLAN encapsulation or decapsulation VXLAN encapsulation is further encapsulated according to the instruction in the flow entry, and the VXLAN encapsulation or decapsulation VXLAN encapsulation is sent. The virtual machine of the remote packet or the local virtual machine can solve the problem that the existing OpenFlow network protocol does not have full support for VXLAN, which is not conducive to the deployment of VXLAN in the OpenFlow network, and the application field of VXLAN is limited. Can fully utilize the advantages of the existing OpenFlow protocol, complete the OpenFlow support for VXLAN under the premise of maintaining a unified mechanism, reduce the difficulty of deploying VXLAN in OpenFlow network, and expand the application field of VXLAN, enriching The OpenFlow protocol facilitates the further development of the protocol.

 FIG. 1 is a schematic structural diagram of an apparatus for transmitting a scalable virtual local area network (LAN) packet according to another embodiment of the present invention; specifically, an open flow controller is applied to an open flow network, as shown in FIG. The device specifically includes: a processor, a memory, and a communication bus. The processor is connected to the communication bus. The open flow controller specifically includes a communication interface, and communicates with other network element devices (for example, an open flow switch) through the communication interface.

 When the processor retrieves instructions from memory, the following steps are performed:

 And receiving, by the OpenFlow switch, a packet sent by the first virtual machine, where the first packet is received by the OpenFlow switch, where the first packet is received by the OpenFlow switch. The matching item is configured by the OpenFlow switch according to the information of the first packet;

 Acquiring, according to the matching item of the first message, the first flow entry corresponding to the matching item of the first message;

Sending the first flow entry to the open flow switch, so that the open flow switch encapsulates the first packet according to the first flow entry to expand the virtual local area network VXLAN encapsulation, The encapsulated first packet is sent to the second virtual machine.

 For example, the first flow entry corresponding to the matching of the first packet is obtained according to the matching of the first packet, including:

 Querying the flow table of the open flow controller, if there is a first flow entry corresponding to the matching of the first packet, obtaining the first flow entry from the flow table; The first flow entry corresponding to the matching of the first packet is used to construct the first flow entry.

 The instruction of the first flow entry includes an action type of adding a VXLAN encapsulation, and the structure of the action type of the VXLAN encapsulation includes an IP address of a VXLAN tunnel endpoint VTEP where the second virtual machine is located; or

 The instruction of the first flow entry includes an action type of the VXLAN encapsulation, and the matching of the first flow entry includes an IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located.

 For example, after the first flow entry corresponding to the matching of the first packet is obtained, the following includes:

 And the first packet is encapsulated by the first flow entry to expand the virtual local area network (VXLAN), and the encapsulated first packet is sent to the second virtual machine.

 For example, when the processor retrieves the instruction in the memory, the following steps are performed: receiving a matching between the second packet sent by the OpenFlow switch and the second packet, where the second packet is The OpenFlow switch receives the packet sent by the second virtual machine, and the matching item of the second packet is configured by the OpenFlow switch according to the information of the second packet.

 Obtaining, according to the matching item of the second message, a second flow entry corresponding to the matching item of the second message;

 Sending the second flow entry to the OpenFlow switch, so that the OpenFlow switch decapsulates the second packet according to the second flow entry to expand the virtual local area network VXLAN encapsulation, The decapsulated second packet is sent to the first virtual machine located in the open flow network;

 And obtaining, by the matching item of the second packet, a second flow entry corresponding to the matching item of the second packet, including:

Querying the flow table of the open flow controller, if there is a second flow entry corresponding to the matching of the second packet, obtaining the second flow entry from the flow table; And configuring, by the second flow entry corresponding to the matching of the second packet, the second flow entry. The instruction of the second flow entry includes an action type of the VXLAN encapsulation.

 For example, after acquiring the second flow entry corresponding to the matching item of the second packet according to the matching item of the second packet, the method includes:

 Decapsulating the VXLAN encapsulation of the second packet according to the second flow entry, and sending the decapsulated second packet to the OpenFlow switch.

 For example, after receiving the matching between the second packet sent by the OpenFlow switch and the second packet, the method includes:

 Establishing a MAC address of the second virtual machine and the second virtual machine according to a MAC address of the second virtual machine included in the information of the second packet and an IP address of the VTEP where the second virtual machine is located Correspondence between the IP addresses of the VTEPs.

 The embodiment of the present invention adopts an action type (adding VXLAN encapsulation and de-VXLAN encapsulation) or a new matching item on the basis of the Action type specified in the existing OpenFlow protocol, so that the OpenFlow controller is open according to the The matching item sent by the flow switch constructs or determines a flow entry corresponding to the matching item, and sends the flow entry to the OpenFlow switch, so that the OpenFlow switch according to the instruction in the flow entry sent by the OpenFlow controller The message is encapsulated in a VXLAN package or decapsulated in a VXLAN package, and the VXLAN encapsulated or unencapsulated VXLAN encapsulated packet is sent to the remote virtual machine or the local virtual machine; the existing OpenFlow network protocol can be solved without VXLAN. Full support, which is not conducive to VXLAN deployment in OpenFlow network, VXLAN application domain is limited; can take full advantage of the existing OpenFlow protocol, under the premise of maintaining a unified mechanism, the implementation of OpenFlow to VXLAN Full support, reducing the difficulty of deploying VXLAN in OpenFlow network, and opening up VXLAN With areas rich of the OpenFlow protocol, it is conducive to the further development of the agreement.

 FIG. 12 is a schematic structural diagram of a transmission system of an extensible virtual local area network (LAN) packet according to another embodiment of the present invention. As shown in FIG. 12, the method includes: an open flow switch 121 and an open flow controller 122; 8 or the transmission device of the scalable virtual local area network message described in FIG. 10, the details refer to the related description in the transmission device of the scalable virtual local area network message described in FIG. 8 or FIG. 10;

The open flow controller 122 is a transmission device of the scalable virtual local area network message as described in FIG. 9 or FIG. 11 . For details, refer to the transmission device of the expandable virtual local area network message described in FIG. 9 or FIG. 11 . Related description.

 A person skilled in the art can clearly understand that, for the convenience and the cleaning of the description, the specific working processes of the system, the device and the unit described above can be referred to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

 The specific description of the above embodiment is based on the case where the first virtual machine and the second virtual machine are in the same network segment and the same VXLAN, and the present invention is still applicable to other cases. For example, if the first virtual machine and the second virtual machine are in different network segments, the first virtual machine does not directly obtain the MAC address of the second virtual machine through the ARP request packet, and the IP gateway of the first virtual machine is obtained first. The MAC address, and the MAC address of the IP gateway of the first virtual machine is used as the MAC address of the second virtual machine of the present invention. If the first virtual machine and the second virtual machine are in different VXLANs or the second virtual machine is located in the non-VXLAN, the open flow switch and the controller do not directly obtain the IP address of the VTEP where the second virtual machine is located, but obtain The IP address of the VXLAN gateway, and the IP address of the VXLAN gateway is used as the IP address of the VTEP where the second virtual machine is located in the present invention. In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise. The components displayed by the unit may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.

 In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above software functional unit is stored in a storage medium, including several instructions Part of the steps of the method of the various embodiments of the present invention are performed by a computer device (which may be a personal computer, server, or network device, etc.). The foregoing storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and the like. The medium of the program code.

 It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or the equivalents of the technical features are replaced by the same. However, the modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

claims 1. A scalable virtual local area network^ transmission method applied in an open flow network, which is characterized by: The OpenFlow switch receives the first message sent by the first virtual machine located in the OpenFlow network, and constructs a matching item of the first message based on the information of the first message; According to the matching item of the first message, obtain the first flow table entry corresponding to the matching item of the first message; Add an extensible virtual LAN VXLAN encapsulation to the first packet according to the first flow entry, and send the encapsulated first packet to the second virtual machine; The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. 2. The method according to claim 1, characterized in that, according to the matching item of the first message, obtaining the first flow entry corresponding to the matching item of the first message, including: The OpenFlow switch queries the flow table of the OpenFlow switch. If it is determined that the flow table contains a first flow table entry corresponding to the matching item of the first message, then obtain all the flow entries from the flow table. The first flow entry, otherwise the first message and the matching item of the first message are sent to the open flow controller, so that the open flow controller sends the first flow entry to the open flow switch with the first flow entry. The first flow entry corresponding to the matching item of a packet. 3. The method according to claim 1 or 2, characterized in that, the instruction of the first flow entry includes an action type of adding VXLAN encapsulation, and the structure of the action type of adding VXLAN encapsulation includes the third The IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or the instruction of the first flow entry includes the action type of adding VXLAN encapsulation, and the matching item of the first flow entry includes the IP address of the VXLAN tunnel endpoint where the second virtual machine is located. IP address of the VXLAN tunnel endpoint VTEP. 4. An extensible virtual LAN text transmission method, applied in an open flow network, characterized by: The OpenFlow switch receives the second message sent by the second virtual machine, and constructs a matching item of the second message based on the information of the second message; According to the matching item of the second text, obtain the second flow table entry corresponding to the matching item of the second text; Unencapsulate the extensible virtual LAN VXLAN encapsulation of the second packet according to the second flow entry Install, and send the decapsulated second packet to the first virtual machine located in the OpenFlow network; the first virtual machine and the second virtual machine are located in different OpenFlow switches or different on the physical machine. 5. The method according to claim 4, characterized in that, according to the matching item of the second message, obtaining the second flow entry corresponding to the matching item of the second message includes: The OpenFlow switch queries the flow table of the OpenFlow switch. If it is determined that the flow table contains a second flow table entry corresponding to the matching item of the second message, then obtain the flow table from the flow table. The second flow entry, otherwise, the second message and the matching item of the second message are sent to the open flow controller, so that the open flow controller sends the matching item to the open flow switch to the open flow switch. The second flow entry corresponding to the matching item of the second packet, the instruction of the second flow entry includes an action type to remove VXLAN encapsulation. 6. A scalable virtual LAN message transmission method, applied in an open flow network, characterized by: The OpenFlow controller receives a first message sent by the OpenFlow switch and a match of the first message, where the OpenFlow switch receives a first message sent by the first virtual machine located in the OpenFlow network. message, the matching item of the first message is constructed by the OpenFlow switch based on the information of the first message; According to the matching item of the first text, obtain the first flow entry corresponding to the matching item of the first text; Send the first flow entry to the OpenFlow switch, so that the OpenFlow switch encapsulates the first message with an extensible virtual LAN VXLAN encapsulation according to the first flow entry, and encapsulates the encapsulated The first message is sent to the second virtual machine; The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. 7. The method according to claim 6, characterized in that, according to the matching item of the first message, obtaining the first flow entry corresponding to the matching item of the first message includes: The open flow controller queries the flow table of the open flow controller, and if there is a first flow entry corresponding to the matching item of the first message, obtain the first flow entry from the flow table. ; If there is no first flow entry corresponding to the matching item of the first text, construct the first flow entry. 8. The method according to claim 7, characterized in that: in the instruction of the first flow entry It includes an action type of adding VXLAN encapsulation, and the structure of the action type of adding VXLAN encapsulation includes the IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or The instruction of the first flow entry includes the action type of adding VXLAN encapsulation, and the matching item of the first flow entry includes the IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located. 9. The method according to any one of claims 6 to 8, characterized in that, after obtaining the first flow entry corresponding to the matching item of the first message according to the matching item of the first message, The method includes: the open flow controller encapsulates the first message with an extensible virtual LAN VXLAN encapsulation according to the first flow entry, and sends the encapsulated first message to the second virtual machine. 10. A scalable virtual local area network (VLAN) text transmission method, applied in an open flow network, characterized by: The OpenFlow controller receives a second packet sent by the OpenFlow switch and a match of the second packet, where the second packet is a packet sent by the OpenFlow switch received by the second virtual machine, and the second packet is sent by the OpenFlow switch. The matching item of the second message is constructed by the OpenFlow switch based on the information of the second message; According to the matching item of the second text, obtain the second flow table entry corresponding to the matching item of the second text; Send the second flow entry to the OpenFlow switch, so that the OpenFlow switch decapsulates the extensible virtual LAN VXLAN encapsulation of the second packet according to the second flow entry, and converts the The decapsulated second packet is sent to the first virtual machine located in the open flow network; The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. 11. The method according to claim 10, characterized in that, according to the matching item of the second message, obtaining the second flow entry corresponding to the matching item of the second message includes: The open flow controller queries the flow table of the open flow controller, and if there is a second flow entry corresponding to the matching item of the second message, obtains the second flow from the flow table. table entry; if there is no second flow table entry corresponding to the matching item of the second text, construct the second flow table entry, and the instructions of the second flow table entry include de-VXLAN encapsulation Action type. 12. The method according to claim 10 or 11, characterized in that, after obtaining the second flow entry corresponding to the matching item of the second message according to the matching item of the second message, the method includes: The open flow controller unblocks the second packet according to the second flow entry. VXLAN encapsulation, sending the decapsulated second packet to the OpenFlow switch, so that the OpenFlow switch sends the decapsulated second packet to the first virtual machine. 13. The method according to claim 10, characterized in that, after the OpenFlow controller receives the second message sent by the OpenFlow switch and the matching item of the second message, it includes: The open flow controller establishes the MAC address of the second virtual machine and the IP address of the VTEP where the second virtual machine is located based on the MAC address of the second virtual machine contained in the information of the second message. Correspondence between the IP addresses of the VTEP where the second virtual machine is located. 14. A scalable virtual LAN message transmission device, located on the side of the open flow switch, used in the open flow network, and is characterized by including: A building module, configured to receive the first message sent by the first virtual machine located in the open flow network, and construct a matching item of the first message based on the information of the first message; An acquisition module, configured to obtain the first flow entry corresponding to the matching item of the first message according to the matching item of the first message constructed by the building module; An encapsulation module, configured to encapsulate the first message with Extensible Virtual LAN VXLAN encapsulation according to the first flow entry obtained by the acquisition module, and send the encapsulated first message to the second virtual machine; The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. 15. The device according to claim 14, characterized in that the acquisition module is specifically configured to query the flow table of the open flow switch. If it is determined that the flow table contains a flow table corresponding to the first message If the first flow entry corresponding to the matching item is obtained, the first flow entry is obtained from the flow table; otherwise, the first packet and the matching item of the first packet are sent to the open flow controller to The OpenFlow controller is caused to send the first flow entry corresponding to the matching item of the first message to the OpenFlow switch. 16. The device according to claim 14 or 15, wherein the instruction of the first flow entry includes an action type of adding VXLAN encapsulation, and the structure of the action type of adding VXLAN encapsulation includes the third The IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or the instruction of the first flow entry includes the action type of adding VXLAN encapsulation, and the matching item of the first flow entry includes the IP address of the VXLAN tunnel endpoint where the second virtual machine is located. IP address of the VXLAN tunnel endpoint VTEP. 17. A scalable virtual LAN message transmission device, located on the open flow switch side, applied In the open flow network, it is characterized by: A construction module, configured to receive the second message sent by the second virtual machine, and construct a matching item of the second message according to the information of the second message; An acquisition module, configured to obtain the second flow entry corresponding to the matching item of the second message according to the matching item of the second message; An decapsulation module, configured to decapsulate the extensible virtual LAN VXLAN encapsulation of the second message according to the second flow entry, and send the decapsulated second message to the open flow network. The first virtual machine; The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. 18. The device according to claim 17, characterized in that the acquisition module is specifically configured to query the flow table of the open flow switch. If it is determined that the flow table contains the flow table corresponding to the second message If the second flow entry corresponding to the matching item is obtained, the second flow entry is obtained from the flow table; otherwise, the second packet and the matching item of the second packet are sent to the open flow controller. , so that the OpenFlow controller sends the second flow entry corresponding to the matching item of the second message to the OpenFlow switch, and the instruction of the second flow entry includes the action of removing VXLAN encapsulation. type. 19. An extensible virtual LAN message transmission device, located on the side of the open flow controller, used in the open flow network, and is characterized by including: A receiving module, configured to receive a first message sent by the OpenFlow switch and a matching item of the first message. The first message is sent by the OpenFlow switch and received by the first virtual machine located in the OpenFlow network. message, the matching item of the first message is constructed by the OpenFlow switch based on the information of the first message; An acquisition module, configured to obtain the first flow entry corresponding to the matching item of the first message according to the matching item of the first message; A sending module, configured to send the first flow entry to the OpenFlow switch, so that the OpenFlow switch encapsulates the first packet with an extensible virtual LAN VXLAN encapsulation according to the first flow entry, The encapsulated first message is sent to the second virtual machine; The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. 20. The device according to claim 19, wherein the acquisition module is specifically configured to query the flow table of the open flow controller, and if there is a first flow corresponding to the matching item of the first message, entry, obtain the first flow entry from the flow table; if there is no first flow entry corresponding to the matching item of the first message, construct the first flow entry. 21. The device according to claim 19 or 20, wherein the instruction of the first flow entry includes an action type of adding VXLAN encapsulation, and the structure of the action type of adding VXLAN encapsulation includes the third The IP address of the VXLAN tunnel endpoint VTEP where the second virtual machine is located; or the instruction of the first flow entry includes the action type of adding VXLAN encapsulation, and the matching item of the first flow entry includes the IP address of the VXLAN tunnel endpoint where the second virtual machine is located. IP address of the VXLAN tunnel endpoint VTEP. 22. The device according to any one of claims 19 to 21, further comprising: an encapsulation module, configured to encapsulate the first packet with an extensible virtual LAN VXLAN encapsulation according to the first flow entry, Send the encapsulated first message to the second virtual machine. 23. An extensible virtual LAN message transmission device, located on the side of the open flow controller, used in the open flow network, and is characterized by including: A receiving module, configured to receive a second message sent by the OpenFlow switch and a match of the second message. The second message is a message sent by the OpenFlow switch received by the second virtual machine. The matching item of the second message is constructed by the OpenFlow switch based on the information of the second message; An acquisition module, configured to obtain the second flow entry corresponding to the matching item of the second message according to the matching item of the second message; A sending module, configured to send the second flow entry to the OpenFlow switch, so that the OpenFlow switch decapsulates the second packet according to the second flow entry. Encapsulate and send the decapsulated second message to the first virtual machine located in the open flow network; The first virtual machine and the second virtual machine are located on different OpenFlow switches or different physical machines. 24. The device according to claim 23, wherein the acquisition module is specifically configured to query the flow table of the open flow controller, and if there is a second flow table corresponding to the matching item of the second message, flow table entry, then obtain the second flow table entry from the flow table; if there is no second flow table entry corresponding to the matching item of the second message, construct the second flow table entry , the instruction of the second flow entry contains Includes the action type to remove VXLAN encapsulation. 25. The device according to claim 23 or 24, further comprising: an decapsulation module, configured to decapsulate the VXLAN encapsulation of the second packet according to the second flow entry, and encapsulate the VXLAN encapsulation of the second packet. The decapsulated second packet is sent to the OpenFlow switch. 26. The device according to claim 23, further comprising: An establishment module, configured to establish the MAC address of the second virtual machine and the IP address of the VTEP where the second virtual machine is located based on the MAC address of the second virtual machine contained in the information of the second message. Describe the corresponding relationship between the IP addresses of the VTEP where the second virtual machine is located. 27. A scalable virtual local area network-based transmission system, applied in an open flow network, characterized by including: an open flow switch and an open flow controller; The open flow switch includes the extensible virtual LAN message transmission device as described in any one of claims 14-16 and the extensible virtual LAN message transmission device as described in any one of claims 17-18; The open flow controller includes the extensible virtual LAN message transmission device as described in any one of claims 19-22 and the extensible virtual LAN message transmission device as described in any one of claims 23-26.