WO2018001127A1 - 传输方法、装置、系统及计算机可读存储介质 - Google Patents

传输方法、装置、系统及计算机可读存储介质 Download PDF

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Publication number
WO2018001127A1
WO2018001127A1 PCT/CN2017/088704 CN2017088704W WO2018001127A1 WO 2018001127 A1 WO2018001127 A1 WO 2018001127A1 CN 2017088704 W CN2017088704 W CN 2017088704W WO 2018001127 A1 WO2018001127 A1 WO 2018001127A1
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network element
control plane
message
target controller
indication information
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PCT/CN2017/088704
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English (en)
French (fr)
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肖敏
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中兴通讯股份有限公司
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Publication of WO2018001127A1 publication Critical patent/WO2018001127A1/zh

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  • the present invention relates to the field of communications, and in particular to a transmission method, apparatus, system, and computer readable storage medium.
  • FIG. 1 is a schematic diagram of an OpenFlow network component architecture according to the related art.
  • a control plane of an OpenFlow network is used. It is implemented by an OpenFlow controller (SDN controller).
  • the forwarding plane of the OpenFlow network is implemented by an OpenFlow switch (SDN network element device), and the OpenFlow protocol is run between the OpenFlow controller and the OpenFlow switch.
  • the OpenFlow controller uses the OpenFlow protocol to the OpenFlow switch.
  • the flow table and the group table are sent to control the data forwarding, and the data forwarding and routing control are separated.
  • FIG. 2 is a format diagram of the OpenFlow Flow Table according to the related art. As shown in Figure 2, the Flow Table can be included. There are multiple Flow Table Entry.
  • the Match Fields in each flow table entry can be any field in the message header (such as address field, user identification field, service priority field, etc.). Then, for the message that the Flow Table matches successfully, the instruction in the corresponding flow table entry is executed, and each instruction may include multiple actions, which include adding a package to the packet and removing the package from the packet.
  • the action can be set to any flow table entry, including "Table-miss".
  • the match field is a wildcard flow table entry, which is used to match those messages that do not match any other flow table entries, and, in general, matches the "Table-miss" flow table entry successfully. Messages are sent to the controller for processing.
  • the OpenFlow network supports multi-controller control, that is, the same OpenFlow switch can be connected to multiple controllers simultaneously and simultaneously controlled by multiple controllers.
  • the OpenFlow protocol standard defines three types of controllers: a Master Controller, an Equal Controller, and a Slave Controller.
  • the Master Controller and the Equal Controller have OpenFlow switches. Read and write capabilities, while the Slave Controller only has read capabilities for OpenFlow switches.
  • the OpenFlow protocol standard also stipulates that there can be at most one Master Controller in an OpenFlow network. When an OpenFlow network with multiple controllers is actually deployed, the Master Controller usually has relatively more processing power.
  • a Software Defined Network usually contains a large number of network element devices. Each network element device can connect to a large number of network terminals or network element devices of adjacent networks. Therefore, network element devices often occur. If there are too many packets sent in a short period of time, the controller will not be able to process the packets. If this happens, the packets will be lost, and the controllers will be disconnected from the NE devices.
  • the current method used in the industry is to limit the rate of packets sent by the NE device. However, this method cannot avoid the loss of the sent packets.
  • some control protocol packets that are important to the network operation need to be sent to the controller for processing. The method of limiting the rate of packets sent by the network element device cannot avoid the higher priority. The important delivery message is lost.
  • Embodiments of the present invention provide a transmission method, apparatus, system, and computer readable storage medium.
  • a method for transmitting a message comprising: a control plane device transmitting indication information to a network element device in an SDN, wherein the indication information is used to indicate a target controller, the target control
  • the controller is a controller that receives a message sent by the network element device, and is a controller in the control plane device; the control plane device receives a target controller of the network element device to the control plane device The message sent.
  • the method further includes: the control plane device carrying the indication information in the configuration information, and sending the configuration information to the network element device, where the configuration information is used to indicate the network
  • the meta device generates a plurality of flow table entries and instructs to send a message matching some or all of the plurality of flow table entries to the target controller.
  • the configuration information includes: flow table configuration information, where the flow table configuration information is used to instruct the network element device to generate a flow table that includes multiple flow table entries, and instruct the network element device to perform the
  • the flow table configuration information sends some or all of the flow table entries in the flow table to the target controller.
  • the method before the control plane device receives the packet sent by the network element device to the target controller in the control plane device, the method further includes: the control plane device verifying the packet And in the case that the packet is a packet corresponding to the target controller, determining that the packet passes verification and receives the packet.
  • the control plane device performs verification on the packet, where the control plane device verifies the identifier information in the packet header of the packet, where the identifier information is corresponding to the target controller.
  • the identification information the packet is determined to be authenticated, and the packet is determined to be unverified.
  • the identifier information is set by the network element device according to the indication information.
  • the method before the control plane device sends the indication information to the network element device in the SDN, the method further includes: determining, by the control plane device, the priority of different types of packets to be transmitted in the network element device according to a preset rule. Level, the indication information is set according to the priority.
  • a method for transmitting a message comprising: a network element device in an SDN receiving indication information delivered by a control plane device; the network element device transmitting a report according to the indication information The text is sent to a target controller in the control plane device.
  • the network element device receives the indication information that is sent by the control plane device, and includes: the network element device receives the configuration information that is sent by the control plane device and carries the indication information; and the network element device generates the configuration information according to the configuration information. And sending, according to the indication information, a message matching some or all of the flow table entries of the plurality of flow table entries to the target controller.
  • the method before the sending of the to-be-transmitted message to the target controller in the control plane device, the method further includes: the network element device setting the to-be-transmitted according to the indication information.
  • the identifier information in the packet header of the packet wherein the target controller receives the to-be-transmitted packet if the identifier information is verified by the target controller.
  • a device for transmitting a message which is applied to a control plane device, includes: a first sending module, configured to send indication information to a network element device in an SDN, wherein the indication information For indicating a target controller, the target controller is a controller that receives a message sent by the network element device, and is a controller in the control plane device; and the first receiving module is configured to receive the network A message sent by the metadevice to a target controller in the control plane device.
  • the first sending module is further configured to: carry the indication information to the configuration information, and send the configuration information to the network element device, where the configuration information is used to indicate the network element device Generating a plurality of flow table entries and instructing to send a message matching some or all of the plurality of flow table entries to the target controller.
  • the configuration information includes: flow table configuration information, where the flow table configuration information is used to instruct the network element device to generate a flow table that includes multiple flow table entries, and instruct the network element device to perform the
  • the flow table configuration information sends some or all of the flow table entries in the flow table to the target controller.
  • the first receiving module is further configured to: before receiving the packet sent by the network element device to the target controller in the control plane device, verifying the packet, where In the case that the message is a packet corresponding to the target controller, it is determined that the packet passes the verification and receives the packet.
  • the first receiving module is configured to verify the identifier information in the packet header of the packet, and if the identifier information is the identifier information corresponding to the target controller, determine the report. If the packet is not verified, the identifier information is determined by the network element device according to the indication information.
  • the first sending module is further configured to: before the control plane device sends the indication information to the network element device in the SDN, determine, according to a preset rule, a priority of different types of to-be-transmitted packets in the network element device. And setting the indication information according to the priority.
  • a device for transmitting a message which is applied to a network element device in an SDN, includes: a second receiving module configured to receive indication information delivered by a control plane device; and a second sending module And configured to send the to-be-transmitted message to the target controller in the control plane device according to the indication information.
  • the second receiving module is further configured to receive configuration information that is sent by the control plane device and that carries the indication information; the second sending module is further configured to generate multiple flow table entries according to the configuration information, and according to the The indication information sends a message matching some or all of the plurality of flow table entries to the target controller.
  • the second sending module is further configured to set the to-be-transmitted report according to the indication information before sending the to-be-transmitted message to the target controller in the control plane device according to the indication information.
  • a transport message system including: a control plane device, a network element device in an SDN; and the control plane device is configured to send indication information to the network element device, where The indication information is used to indicate a target controller; the target controller is a controller that receives a message sent by the network element device, and is a controller in the control plane device; the network element device is configured Receiving the indication information delivered by the control plane device; and transmitting, according to the indication information, a packet to be transmitted to a target controller in the control plane device; the control plane device is further configured to receive The message sent by the network element device to a target controller in the control plane device.
  • a computer readable storage medium is also provided.
  • the storage medium is configured to store program code for performing the following steps: sending indication information to the SDN
  • the network element device wherein the indication information is used to indicate a target controller;
  • the target controller is a controller that receives a message sent by the network element device, and is a controller in the control plane device; receiving A packet sent by the network element device to a target controller in the control plane device.
  • the computer readable storage medium is further configured to store program code for performing the following steps: receiving indication information sent by the control plane device; and sending the to-be-transmitted message to the control plane device according to the indication information Target controller.
  • the computer readable storage medium of the embodiment of the present invention wherein the computer program is stored thereon, and the computer program is executed by the processor to implement the step of the control plane device side method, or implement the network element device in the SDN.
  • the steps of the side method are not limited to, the computer readable storage medium of the embodiment of the present invention, wherein the computer program is stored thereon, and the computer program is executed by the processor to implement the step of the control plane device side method, or implement the network element device in the SDN.
  • the control plane device sends the indication information to the network element device, and instructs the network element device to send the packet to be sent to the designated controller in the control plane device, and the control plane device may have multiple controllers. Different controllers are good at processing different types of packets.
  • the control plane device manages multiple controllers and packets to be sent, and correspondingly, multiple controllers can process packets of network element devices in a timely manner. The problem that the packets sent by the software-defined network in the related art are lost is solved, and the transmission quality of the sent packets is guaranteed.
  • FIG. 1 is a schematic diagram of an OpenFlow network component architecture according to the related art
  • FIG. 2 is a format diagram of an OpenFlow flow table according to the related art
  • FIG. 3 is a flowchart 1 of a method for transmitting a message according to an embodiment of the present invention
  • FIG. 4 is a second flowchart of a method for transmitting a message according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a network element device connected to an adjacent network according to an alternative embodiment of the present invention.
  • FIG. 6 is a schematic diagram of content of a flow table generated by the network element device 3 of FIG. 5 according to an alternative embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a format of a packet sent by a network element device 3 of FIG. 5 to a target controller according to an alternative embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a network element device connected to a terminal according to an alternative embodiment of the present invention.
  • FIG. 9 is a schematic diagram of content of a flow table generated by the network element device 9 of FIG. 8 according to an alternative embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a format of a message sent by a network element device 9 to a target controller in FIG. 8 according to an alternative embodiment of the present invention
  • FIG. 11 is a structural block diagram of an apparatus for transmitting a message to a control plane device according to an embodiment of the present invention.
  • FIG. 12 is a structural block diagram of a device for transmitting a message applied to a network element device in an SDN according to an embodiment of the present invention.
  • the embodiments in the present application can be run on a control plane device or a network element device in an SDN.
  • the control plane device in the SDN includes multiple controllers, and the multiple controllers can be of different types, such as a Master Controller or an Equal. Controller.
  • FIG. 3 is a flowchart 1 of a method for transmitting a message according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:
  • Step S302 the control plane device sends the indication information to the network element device in the SDN.
  • the indication information is used to indicate a target controller that receives the message sent by the network element device, and the target controller is a controller in the control plane device.
  • the indication information is used to indicate a target controller
  • the target controller is a controller that receives a message sent by the network element device
  • the target controller is a control in the control plane device. Controller.
  • the target controller described in this embodiment is a controller on the side of the control plane device, and may be a Master Controller or other type of controller in the SDN network, which is described in the background art as having different functions.
  • the control plane device uniformly refers to the controller of the type of the master controller or the equal controller, that is, the type of the indication information that can be sent to the network element device is the master controller or the Equal Controller. Any of the controllers, including the target controller.
  • Step S304 the control plane device receives the packet sent by the network element device to the target controller in the control plane device.
  • the network element device directly sends the message to the target controller
  • the control plane device is a generic name, that is, the target controller receives the packet sent by the network element device.
  • the control plane device sends the indication information to the network element device in the SDN, where the indication information is used to indicate the target controller that receives the message sent by the network element device, and the target controller is the control plane device.
  • the controller in the control plane device receives the message sent by the network element device to the target controller in the control plane device.
  • the Flow Table configuration message sent by the controller to the network element device is used to configure the Flow Table of the network element device.
  • Each Flow Table includes multiple flow table entries, and each flow table entry includes message matching information and how to process the matching flow table.
  • Each flow table entry includes target controller selection information, and is used to select a sent controller for the uplink message sent to match the flow table entry, so as to send the network element device to the target controller.
  • the packets are load-balanced to ensure that the sent packets are not discarded due to insufficient processing power of the controller.
  • the target controller selection information is separately set for each flow table entry, because each flow table entry contains message matching information and corresponds to a certain type of message, and the controller corresponds to a certain type of report corresponding to each flow table entry.
  • the purpose of setting the target controller selection is to select different types of controllers for the outgoing messages of different importance levels.
  • the target controller selection information is separately set for each network element, so that the load balancing of the uplink packet based on the network element device can be implemented.
  • control plane device carries the indication information to the configuration information, and sends the configuration information to the network element device, where the network element device generates multiple flows according to the configuration information.
  • a table entry and according to the indication information, sends a message matching some or all of the plurality of flow table entries to the target controller.
  • the configuration information is used to configure the flow table of the network element device.
  • the network element device generates multiple flow table entries according to the configuration information.
  • the technology is related to the configuration. The focus of this embodiment is to carry the indication information in the configuration information, and the indication is matched according to the indication information. Which controller is sent to the flow table entry.
  • the configuration information includes: Flow Table configuration information, where the Flow Table configuration information is used to indicate that the network element device generates a Flow Table that includes multiple flow table entries, and indicates that the network element device is configured according to the Flow Table.
  • the message is sent to the target controller by a message matching some or all of the flow table entries in the Flow Table.
  • This embodiment is a type of configuration information.
  • the indication information sent by the control plane device may only involve partial flow table entries, and may also involve all flow table entries.
  • the network element device After receiving the flow table configuration message sent by the controller, the network element device generates a flow table including multiple flow table entries according to the flow table configuration message indication, and sets one flow entry for each flow table entry according to the flow table configuration message indication.
  • Target controller selection It should be noted that not every flow table entry will send the message to the target controller, but after considering that the controller modifies the flow table entry, the message matching the flow table entry is sent to the target controller. The possibility of setting a target controller selection for each flow table entry is necessary, of course, and it is not excluded that the target controller selection is only set for the flow table entry that will send the message to the target controller.
  • the control plane device verifies the packet, and after receiving the packet, the packet is received after the verification is passed. In the case that the packet is a packet corresponding to the target controller, it is determined that the packet passes the verification, otherwise it is determined that the packet fails the verification. In an embodiment, the control plane device verifies the identifier information in the packet header of the packet, where the identifier information is set by the network element device according to the indication information, and the identifier information is associated with the target controller. In the case of the corresponding identification information, it is determined that the message passes the verification, otherwise it is determined that the message has not passed the verification.
  • the control plane device determines the priority of the different types of the to-be-transmitted packet in the network element device according to the preset rule, according to the priority level. Set this indication.
  • the control plane device determines the priority of the packet to be transmitted according to a preset rule, and the priority may be the importance of the packet type, for example, between networks.
  • the priority of the packet is higher than that of the internal network.
  • Border Gateway Protocol (BGP) packet has a higher priority than the Link Layer Discovery Protocol (LLDP) packet.
  • the priority of the packet is high. The better the performance of the uplink destination controller set for the packet in the indication information, or the controller that is most suitable for the packet type.
  • FIG. 4 is a second flowchart of a method for transmitting a message according to an embodiment of the present invention. As shown in FIG. 4, the steps are as follows:
  • Step S402 The network element device in the SDN receives the indication information sent by the control plane device.
  • Step S404 the network element device sends the to-be-transmitted message to the target controller in the control plane device according to the indication information.
  • the network element device receives the indication information that is sent by the control plane device, and the network element device receives the configuration information that is sent by the control plane device and carries the indication information; the network element device generates multiple flow tables according to the configuration information. An entry, and according to the indication information, sends a message matching some or all of the flow table entries of the plurality of flow table entries to the target controller.
  • the network element device sets the identifier in the packet header of the to-be-transmitted packet according to the indication information, before sending the to-be-transmitted packet to the target controller in the control plane device according to the indication information.
  • Information wherein the target controller receives the to-be-transmitted message if the identification information is verified by the target controller.
  • the network element device sets the target controller selection field in the header of the sent packet according to the target controller selection information of the flow table entry matched by the packet, and reports the packet. Send the corresponding controller on the text.
  • the network element device When the packet entering the network element device completes the flow table matching and needs to be sent to the target controller according to the flow table command, the network element device encapsulates the packet to be sent in the message and sends the message to the controller.
  • the specific controller to which the controller is sent is determined by the target controller selection information of the flow table entry matched by the message.
  • the network element device sets the target controller selection field in the header of the sent packet according to the target controller selection information of the flow table entry matched by the packet, because not all the networks
  • the device has the ability to send different packets to different controllers on the hardware.
  • the target controller selection field in the message header indicates that the target controller filters the received message, so that the target controller only processes the selected controller. Send a message.
  • network A is an SDN including three controllers, and three controllers are a Master Controller plus two.
  • the equalizing device, the network element device 1, the network element device 2, and the network element device 3 are all located in the network A; the network B can be either an SDN or a non-SDN, the network element device 4, the network element device 5, and the network element device 6
  • the network element device 3 is connected to the network element device 2 and is connected to the network element device 4. Therefore, the network element device 3 receives the LLDP packet from the network element device 2 and receives it. BGP packet from network element device 4.
  • the SDN controller (which may be any of the three controllers) sets the target controller selection for the message sent by the network element device 3 through the extended OpenFlow protocol.
  • the SDN controller and the network element device 3 perform the following steps:
  • Step 1 The controller sends a Flow Table configuration message to the network element device 3, where the flow table configuration message includes a flow table entry matching the BGP packet, a flow table entry matching the LLDP packet, and the matching does not successfully match all other flow table entries.
  • (Table-miss) Flow table entry for the message, and target controller selection information for each of the above flow table entries.
  • BGP packets, LLDP packets, and packets that do not match all other flow table entries are packets that the NE device 3 needs to send to the target controller for processing. Select different target controls for these three types of packets. The load balancing of the sent packets can be implemented.
  • the BGP packets are more important to the normal operation of the network.
  • the BGP packets are more important than the LLDP packets and packets that do not match all other flow table entries. Therefore, the target controller selected for the BGP packet is the master controller, the target controller selected for the LLDP packet and the packet that does not successfully match all the other flow table entries is the Equal Controller, and the controller sends the flow to the network element device 3.
  • the table configuration message includes the flow table entries corresponding to the above three types of sent messages and the target controller selection.
  • Step 2 The network element device 3 generates a Flow Table after receiving the Flow Table configuration message sent by the controller, and configures a target controller selection for each flow table entry according to the flow table configuration message.
  • FIG. 6 is a schematic diagram of content of a flow table generated by a network element device 3 according to an alternative embodiment of the present invention.
  • the corresponding command (Apply-Actions ⁇ Output Controller ⁇ ) sends the matching BGP packet to the target controller.
  • the corresponding instruction (Apply-Actions ⁇ Output Controller ⁇ ) sends the message to the target controller that does not successfully match all other flow table entries.
  • the corresponding target controller is selected as Equal Contr. Oller.
  • Step 3 For the packet that needs to be sent to the target controller, the network element device 3 sets the target controller selection field in the header of the sent packet according to the target controller selection information of the flow table entry matched by the packet. And send the message to the corresponding controller.
  • FIG. 7 is a schematic diagram of a format of a packet sent by a network element device 3 to a target controller according to an alternative embodiment of the present invention.
  • the packet header sent by the network element device 3 to the target controller packet includes a target.
  • the controller selects a field, and the value of the field is derived from the target controller selection corresponding to the flow table entry matched by the sent message.
  • the network element device 3 supports the ability to send different packets to different controllers, the BGP packets matching the first flow table entry will only be sent to the master controller, and the LLDP matching the second flow table entry. The packet and the packet matching the third flow table entry that are not successfully matched to all other flow table entries are sent to the Equal Controller.
  • the network element device 3 adopts presets because there are two Equal Controllers on the network. The load-sharing algorithm of the uplink packet is sent to the two Equal Controllers in a balanced manner, and the packets of the unsuccessfully matched packets are sent to the two equal controllers. Send or turn around on a packet-by-pack basis.
  • the BGP packet with the first flow table entry, the LLDP packet matching the second flow table entry, and the packet matching the third flow table entry that failed to match all other flow table entries are simultaneously sent to the third. Controllers, including a Master Controller and two Equal Controllers.
  • the master controller After receiving the packet sent by the network element device 3, the master controller only processes the target controller selection field included in the packet header to indicate the packet of the master controller, and discards other packets; the Equal Controller receives the network element. After the packet sent by the device 3 is processed, only the packets of the target controller selected in the packet header are displayed, and the other packets are discarded.
  • FIG. 8 is a schematic diagram of a network element device connected to a terminal according to an alternative embodiment of the present invention.
  • network C is an SDN including three controllers, and three controllers are one master controller plus two equals.
  • the network element device 7, the network element device 8, and the network element device 9 are all located in the network C.
  • the network element device 9 is connected to the network element device 8 and is connected to the terminal. Therefore, the network element device 9 receives both from the network element device 9
  • the LLDP packet of the network element device 8 receives the Internet Control Message Protocol (ICMP) packet from the terminal.
  • the SDN controller (which may be any of the three controllers) sets the target controller selection for the message sent by the network element device 9 through the extended OpenFlow protocol.
  • ICMP Internet Control Message Protocol
  • the SDN controller and the network element device 9 perform the following steps:
  • Step 1 The controller sends a flow table configuration message to the network element device 9, where the flow table configuration message includes a flow table entry matching the ICMP message, a flow table entry matching the LLDP message, and a match that does not successfully match all other flow table entries.
  • (Table-miss) Flow table entry for the message, and target controller selection information for each of the above flow table entries.
  • ICMP packets, LLDP packets, and packets that do not successfully match all other flow table entries are packets that the NE device 9 needs to send to the target controller for processing. Select different target controls for these three types of sent packets. The load balancing of the sent packets can be implemented. In addition, the three types of sent packets are different in importance to the normal operation of the network. The importance of ICMP packets is higher than that of LLDP packets and packets that do not successfully match all other flow table entries.
  • the target controller selected for the ICMP packet is the master controller
  • the target controller selected for the LLDP packet is the Equal Controller 1
  • the target controller selected for the packet that does not successfully match all other flow table entries is the Equal Controller 2
  • the flow table configuration message sent by the controller to the network element device 9 is included in the The flow table entries corresponding to the three types of sent messages and the target controller selection are described.
  • Step 2 After receiving the flow table configuration message sent by the controller, the network element device 9 generates a flow table, and configures a target controller selection for each flow table entry according to the flow table configuration message.
  • FIG. 9 is a schematic diagram of content of a flow table generated by a network element device 9 according to an alternative embodiment of the present invention.
  • the corresponding command (Apply-Actions ⁇ Output Controller ⁇ ) sends the matching ICMP message to the target controller.
  • the corresponding target controller selects
  • the corresponding command (Apply-Actions ⁇ Output Controller ⁇ ) sends the message to the target controller that does not successfully match all other flow table entries.
  • the corresponding target controller is selected as Equal Contro. Ller 2.
  • Step 3 For the message that needs to be sent to the target controller, the network element device 9 sets the target controller selection field in the sent header according to the target controller selection information of the matching flow table entry of the packet, and The message is sent to the corresponding controller.
  • FIG. 10 is a schematic diagram of a format of a packet sent by a network element device 9 to a target controller according to an alternative embodiment of the present invention.
  • a packet header sent by the network element device 9 to a target controller packet includes a target.
  • the controller selects a field, and the value of the field is derived from the target controller selection corresponding to the flow table entry matched by the sent message.
  • the network element device 9 supports the ability to send different packets to different controllers, the ICMP packets matching the first flow table entry will only be sent to the master controller, and the LLDP matching the second flow table entry. The packet will only be sent to the Equal Controller 1. The packets matching the third flow table entry that do not match all other flow table entries will be sent to the Equal Controller 2.
  • the network element device 9 does not support the ability to send different packets to different controllers, the ICMP packets matching the first flow table entry, the LLDP packets matching the second flow table entry, and the Messages with the third flow table entry that do not match all other flow table entries are sent to three controllers at the same time, including Master Controller, Equal Controller 1, and Equal Controller 2.
  • the master controller After receiving the packet sent by the network element device 9, the master controller only processes the target controller selection field included in the packet header to indicate the packet of the master controller, and discards other packets; the Equal Controller 1 receives the packet. After the packet sent by the device 9 is processed, only the target controller selection field included in the packet header indicates the packet of the Equal Controller 1 and the other packet is discarded.
  • the Equal Controller 2 sends the packet to the network element device 9 After the packet is received, only the target controller selection field included in the packet header indicates the message of the Equal Controller 2, and the other packets are discarded.
  • the technical solution of the present invention which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a storage medium (such as a read-only memory (Read-Only).
  • a storage medium such as a read-only memory (Read-Only).
  • Memory referred to as ROM)/Random Access Memory (RAM), disk, CD-ROM, includes a number of instructions to make a terminal device (can be a mobile phone, computer, server, or network device, etc.)
  • the method of the various embodiments of the present invention is performed.
  • a device for transmitting a message is provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 11 is a structural block diagram of an apparatus for transmitting a message to a control plane device according to an embodiment of the present invention. As shown in FIG. 11, the device includes:
  • the first sending module 112 is configured to send the indication information to the network element device in the SDN, where the indication information is used to indicate the target controller that receives the message sent by the network element device, and the target controller is the control plane a controller in the device;
  • the first receiving module 114 is connected to the first sending module 112 and configured to receive the network element setting. A message sent to the target controller in the control plane device.
  • the first sending module 112 is further configured to carry the indication information to the configuration information, and send the configuration information to the network element device, where the network element device generates multiple flow tables according to the configuration information.
  • An entry, and according to the indication information, sends a message matching some or all of the flow table entries of the plurality of flow table entries to the target controller.
  • the configuration information includes: flow table configuration information, where the flow table configuration information is used to indicate that the network element device generates a flow table that includes multiple flow table entries, and indicates that the network element device is configured according to the flow table.
  • the message sends a message matching some or all of the flow table entries in the flow table to the target controller.
  • the first receiving module 114 is further configured to verify the packet before receiving the packet sent by the network element device to the target controller in the control plane device, where the packet is verified. In the case of a packet corresponding to the target controller, it is determined that the packet passes the verification, otherwise it is determined that the packet has not passed the verification, and the packet is received when the packet passes the verification.
  • the first receiving module 114 is configured to verify the identifier information in the packet header of the packet, where the identifier information is set by the network element device according to the indication information, and the identifier information is In the case that the target controller corresponds to the identification information, it is determined that the packet passes the verification, otherwise it is determined that the packet fails the verification.
  • the first sending module 112 is further configured to determine, according to a preset rule, different types of to-be-transmitted reports in the network element device, before the control plane device sends the indication information to the network element device in the software-defined network SDN.
  • the priority of the text, and the indication information is set according to the priority.
  • the first sending module 112 and the first receiving module 114 may be implemented by a processor in a device that transmits a message in combination with a network interface.
  • FIG. 12 is a structural block diagram of a device for transmitting a message applied to a network element device in an SDN according to an embodiment of the present invention. As shown in FIG. 12, the device includes:
  • the second receiving module 122 is configured to receive the indication information sent by the control plane device
  • the second sending module 124 is connected to the second receiving module 122 and configured to send the to-be-transmitted message to the target controller in the control plane device according to the indication information.
  • the second receiving module 122 is further configured to receive the bearer sent by the control plane device.
  • Configuration information with indication information
  • the second sending module 124 is further configured to generate a plurality of flow table entries according to the configuration information, and send, according to the indication information, packets matching some or all of the flow table entries of the plurality of flow table entries to the target controller. .
  • the second sending module 124 is further configured to: before sending the to-be-transmitted message to the target controller in the control plane device according to the indication information, setting the to-be-transmitted message according to the indication information.
  • the second receiving module 122 and the second sending module 124 can be implemented by a processor in a device for transmitting a message in combination with a network interface.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination.
  • the forms are located in different processors.
  • a transport message system including: a control plane device, a network element device in an SDN;
  • the control plane device is configured to send indication information to the network element device, where the indication information is configured to indicate a target controller that receives the message sent by the network element device, and the target controller is a control in the control plane device Device
  • the network element device receives the indication information sent by the control plane device, and sends the message to be transmitted to the target controller in the control plane device according to the indication information;
  • the control plane device receives the message sent by the network element device to a target controller in the control plane device.
  • Embodiments of the present invention also provide a computer readable storage medium.
  • the above storage medium may be configured to store program code for performing the following steps:
  • the storage medium is set to store program code for performing the following steps:
  • the foregoing storage medium may include, but is not limited to, a U disk, a ROM, a RAM, a mobile hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.
  • the processor performs the method steps of the above embodiments in accordance with stored program code in the storage medium.
  • the computer readable storage medium provided by the embodiment of the present invention has a computer program stored thereon, and the computer program is implemented by the processor to implement the step of the control plane device side method, or implements the network element device side in the SDN. The steps of the method.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the control plane device sends the indication information to the network element device, and the network element device sends the packet to be sent to the designated controller in the control plane device, and the control plane device may have multiple Controllers, different controllers are good at handling different types of packets, and the control plane device manages multiple controllers and packets to be sent, and correspondingly, multiple controllers can process the reports of network element devices in a timely and efficient manner.
  • the problem solves the problem that the packet sent in the software-defined network in the related art is lost, and the transmission quality of the sent message is guaranteed.

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Abstract

本发明提供了一种传输方法、装置、系统及计算机可读存储介质，其中，该方法包括：控制面设备发送指示信息到SDN中的网元设备，其中，该指示信息用于指示目标控制器，所述目标控制器为接收该网元设备所发送报文的控制器，且为该控制面设备中的控制器，该控制面设备接收该网元设备向该控制面设备中的目标控制器发送的报文。

Description

传输方法、装置、系统及计算机可读存储介质
相关申请的交叉引用
本申请基于申请号为201610511643.1、申请日为2016年07月01日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及通信领域，具体而言，涉及一种传输方法、装置、系统及计算机可读存储介质。
背景技术
作为软件定义网络的一个实例，开放流(OpenFlow)网络采用控制平面与转发平面相分离的架构，图1是根据相关技术中的OpenFlow网络组件架构示意图，如图1所示，OpenFlow网络的控制平面由OpenFlow控制器(SDN控制器)来实现，OpenFlow网络的转发平面由OpenFlow交换机(SDN网元设备)来实现，OpenFlow控制器与OpenFlow交换机之间运行OpenFlow协议；OpenFlow控制器利用OpenFlow协议向OpenFlow交换机下发流表(Flow Table)和组表(Group Table)，从而达到控制数据转发的目的，实现了数据转发和路由控制的分离。
开放网络基金会(Open Networking Foundation，简称ONF)制定的OpenFlow交换机规范描述了OpenFlow协议及OpenFlow交换机的报文处理流程。根据OpenFlow交换机规范的规定，从入端口进入OpenFlow交换机的报文首先会进行Flow Table的匹配，图2是根据相关技术中的OpenFlow Flow Table的格式图，如图2所示，Flow Table中可以包含多个流表条目(Flow Table Entry)，每个流表条目中的匹配字段(Match Fields)可以是报文头中的任意字段(例如地址字段、用户标识字段、服务优先级字段等)。 接着对于Flow Table匹配成功的报文会执行相应流表条目中的指令(Instruction)，每一条指令中又可以包含多个动作(Action)，这些动作包括给报文增加封装、给报文去除封装、给报文的某个字段赋值、把报文从某个端口输出，等等。有一个动作“Output Controller”用于把报文上送到控制器进行处理，控制器给交换机下发Flow Table时可以把该动作设置到任何一个流表条目中，包括被称为“Table-miss”的匹配字段为通配符的流表条目，该流表条目用于匹配那些跟所有其它流表条目都没有匹配成功的报文，而且，一般来说，匹配“Table-miss”流表条目成功的报文都会被上送到控制器进行处理。OpenFlow网络支持多控制器的控制，也即同一个OpenFlow交换机可以同时连接到多个控制器并同时接受多个控制器的控制。OpenFlow协议标准定义了三种类型的控制器，分别是主控制器(Master Controller)、等同控制器(Equal Controller)和从控制器(Slave Controller)，其中，Master Controller和Equal Controller具备对OpenFlow交换机的读写能力，而Slave Controller只具备对OpenFlow交换机的读能力。OpenFlow协议标准还规定，一个OpenFlow网络中最多只能有一个Master Controller，而在实际部署多控制器的OpenFlow网络时，Master Controller通常具备相对更强的处理能力。
一个软件定义网络(Software Defined Network，简称SDN)通常包含大量的网元设备，每个网元设备又可以连接大量的网络终端或相邻网络的网元设备，于是就经常会发生网元设备在短时间内上送的报文过多导致控制器来不及处理的情况，这种情况一旦发生，轻则导致上送报文丢失，重则引起控制器与网元设备之间的断连。为了防止出现上述情况，目前业界通常采用的方法是对网元设备上送报文进行限速，但这种方法仍无法避免上送报文的丢失。尤其是，在SDN中，有一些对网络运行非常重要的控制协议报文需要上送到控制器进行处理，对网元设备上送报文进行限速的这种方法无法避免优先级较高的重要上送报文的丢失。
针对相关技术中软件定义网络中上送的报文发生丢失的问题，目前还没有有效的解决方案。
发明内容
本发明实施例提供了一种传输方法、装置、系统及计算机可读存储介质。
根据本发明的一个实施例，提供了一种传输报文方法，包括：控制面设备发送指示信息到SDN中的网元设备，其中，所述指示信息用于指示目标控制器，所述目标控制器为接收所述网元设备所发送报文的控制器，且为所述控制面设备中的控制器；所述控制面设备接收所述网元设备向所述控制面设备中的目标控制器发送的报文。
上述方案中，所述方法还包括：所述控制面设备将所述指示信息携带于配置信息，将所述配置信息发送到所述网元设备，其中，所述配置信息用于指示所述网元设备生成多个流表条目，并指示将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
上述方案中，所述配置信息包括：流表配置信息，所述流表配置信息用于指示所述网元设备生成包含多个流表条目的流表，并指示所述网元设备依据所述流表配置信息将所述流表中的部分或者全部流表条目上送到所述目标控制器。
上述方案中，所述控制面设备接收所述网元设备向所述控制面设备中的目标控制器发送的报文之前，所述方法还包括：所述控制面设备对所述报文进行验证，其中，在所述报文为与所述目标控制器对应的报文的情况下，确定所述报文通过验证，接收所述报文。
上述方案中，所述控制面设备对所述报文进行验证包括：所述控制面设备验证所述报文的报文头中的标识信息，在所述标识信息为与所述目标控制器对应的标识信息的情况下，确定所述报文通过验证，否则确定所述报文未通过验证，其中，所述标识信息是所述网元设备依据所述指示信息设置的。
上述方案中，控制面设备发送指示信息到SDN中的网元设备之前，所述方法还包括：所述控制面设备依据预设规则确定所述网元设备中不同类型的待传输报文的优先级，依据所述优先级设置所述指示信息。
根据本发明的另一个实施例，提供了一种传输报文方法，包括：SDN中的网元设备接收控制面设备下发的指示信息；所述网元设备依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器。
上述方案中，所述网元设备接收控制面设备下发的指示信息，包括：网元设备接收控制面设备下发的携带有指示信息的配置信息；所述网元设备依据所述配置信息生成多个流表条目，并依据所述指示信息将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
上述方案中，依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器之前，所述方法还包括：所述网元设备依据所述指示信息设定所述待传输报文的报文头中的标识信息，其中，在所述标识信息通过所述目标控制器验证的情况下，所述目标控制器接收所述待传输报文。
根据本发明的另一个实施例，提供了一种传输报文装置，应用于控制面设备，包括：第一发送模块，配置为发送指示信息到SDN中的网元设备，其中，所述指示信息用于指示目标控制器，所述目标控制器为接收所述网元设备所发送报文的控制器，且为所述控制面设备中的控制器；第一接收模块，配置为接收所述网元设备向所述控制面设备中的目标控制器发送的报文。
上述方案中，所述第一发送模块还配置为将所述指示信息携带于配置信息，将所述配置信息发送到所述网元设备，其中，所述配置信息用于指示所述网元设备生成多个流表条目，并指示将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
上述方案中，所述配置信息包括：流表配置信息，所述流表配置信息用于指示所述网元设备生成包含多个流表条目的流表，并指示所述网元设备依据所述流表配置信息将所述流表中的部分或者全部流表条目上送到所述目标控制器。
上述方案中，所述第一接收模块还配置为在接收所述网元设备向所述控制面设备中的目标控制器发送的报文之前，对所述报文进行验证，其中，在所述报文为与所述目标控制器对应的报文的情况下，确定所述报文通过验证，接收所述报文。
上述方案中，所述第一接收模块配置为验证所述报文的报文头中的标识信息，在所述标识信息为与所述目标控制器对应的标识信息的情况下，确定所述报文通过验证，否则确定所述报文未通过验证，其中，所述标识信息是所述网元设备依据所述指示信息设置的。
上述方案中，所述第一发送模块还配置为在控制面设备发送指示信息到SDN中的网元设备之前，依据预设规则确定所述网元设备中不同类型的待传输报文的优先级，依据所述优先级设置所述指示信息。
根据本发明的另一个实施例，提供了一种传输报文装置，应用于SDN中的网元设备，包括：第二接收模块，配置为接收控制面设备下发的指示信息；第二发送模块，配置为依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器。
上述方案中，第二接收模块还配置为接收控制面设备下发的携带有指示信息的配置信息；所述第二发送模块还配置为依据所述配置信息生成多个流表条目，并依据所述指示信息将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
上述方案中，所述第二发送模块还配置为在依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器之前，依据所述指示信息设定所述待传输报文的报文头中的标识信息，其中，在所述标识信息通过所述目标控制器验证的情况下，所述目标控制器接收所述待传输报文。
根据本发明的另一个实施例，提供了一种传输报文系统，包括：控制面设备，SDN中的网元设备；所述控制面设备配置为发送指示信息到所述网元设备，其中，所述指示信息用于指示目标控制器；所述目标控制器为接收所述网元设备所发送报文的控制器，且为所述控制面设备中的控制器；所述网元设备，配置为接收所述控制面设备下发的所述指示信息；以及依据所述指示信息将待传输的报文发送到所述控制面设备中的目标控制器；所述控制面设备，还配置为接收所述网元设备向所述控制面设备中的目标控制器发送的所述报文。
根据本发明的又一个实施例，还提供了一种计算机可读存储介质。该存储介质设置为存储用于执行以下步骤的程序代码：发送指示信息到SDN 中的网元设备，其中，所述指示信息用于指示目标控制器；所述目标控制器为接收所述网元设备所发送报文的控制器，且为控制面设备中的控制器；接收所述网元设备向所述控制面设备中的目标控制器发送的报文。
上述方案中，计算机可读存储介质还设置为存储用于执行以下步骤的程序代码：接收控制面设备下发的指示信息；依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器。
也就是说，本发明实施例的计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现上述控制面设备侧方法的步骤，或者实现上述SDN中的网元设备侧方法的步骤。
通过本发明实施例，控制面设备下发指示信息到网元设备，指示网元设备将待上送的报文上送到控制面设备中的指定控制器，控制面设备可能有多个控制器，不同的控制器擅长处理不同类型报文，由控制面设备将多个控制器和待上送的报文进行统一管理，分别对应，多个控制器可以及时高效处理网元设备的报文，解决了相关技术中软件定义网络中上送的报文发生丢失的问题，保证了上送报文的传输质量。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明。在附图中：
图1是根据相关技术中的OpenFlow网络组件架构示意图；
图2是根据相关技术中的OpenFlow流表的格式图；
图3是根据本发明实施例的一种传输报文方法的流程图一；
图4是根据本发明实施例的一种传输报文方法的流程图二；
图5是根据本发明可选实施例的网元设备与相邻网络连接的示意图；
图6是根据本发明可选实施例的图5中的网元设备3生成的流表内容示意图；
图7是根据本发明可选实施例的图5中的网元设备3发往目标控制器报文的格式示意图；
图8是根据本发明可选实施例的网元设备与终端相连的示意图；
图9是根据本发明可选实施例的图8中网元设备9生成的流表内容示意图；
图10是根据本发明可选实施例的图8中网元设备9发往目标控制器报文的格式示意图；
图11是根据本发明实施例的一种应用于控制面设备的传输报文的装置结构框图；
图12是根据本发明实施例的一种应用于SDN中的网元设备的传输报文装置结构框图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
实施例1
本申请文件中的实施例可以运行于SDN中的控制面设备或者网元设备上，在SDN中的控制面设备包括多个控制器，多个控制器可以是不同的类型，例如Master Controller或者Equal Controller。
在本实施例中提供了一种运行于上述控制面设备的方法，图3是根据本发明实施例的一种传输报文方法的流程图一，如图3所示，该流程包括如下步骤：
步骤S302，控制面设备发送指示信息到SDN中的网元设备；
其中，该指示信息用于指示接收该网元设备所发送报文的目标控制器，且该目标控制器为该控制面设备中的控制器。
也就是说，该指示信息用于指示目标控制器，所述目标控制器为接收该网元设备所发送报文的控制器，且该目标控制器为该控制面设备中的控 制器。
在本实施例中记载的目标控制器是控制面设备一侧的一个控制器，可以是SDN网络中的Master Controller或者其他类型控制器，在背景技术中记载了它们有不同的功能。需要指出的是，在本发明实施例中，用控制面设备统一指代类型为Master Controller或Equal Controller的控制器，即向网元设备下发上述指示信息的可以是类型为Master Controller或Equal Controller的任一控制器，包括目标控制器。
步骤S304，该控制面设备接收该网元设备向该控制面设备中的目标控制器发送的报文。
这里，网元设备是直接发送该报文到目标控制器的，控制面设备是个统称，即目标控制器接收网元设备上送的报文。
通过上述步骤，控制面设备发送指示信息到SDN中的网元设备，其中，该指示信息用于指示接收该网元设备所发送报文的目标控制器，且该目标控制器为该控制面设备中的控制器，该控制面设备接收该网元设备向该控制面设备中的目标控制器发送的报文。解决了相关技术中SDN中网元设备上送的报文发生丢失的问题，保证了上送报文的传输质量。
控制器向网元设备发送的Flow Table配置消息用于配置网元设备的Flow Table，每个Flow Table包含多个流表条目，每个流表条目包含报文匹配信息以及如何处理匹配该流表条目的报文的指令信息。每个流表条目包含目标控制器选择信息，用于为匹配该流表条目的上送报文在多个控制器中选择上送的控制器，目的是为了对网元设备发往目标控制器的报文进行负载分担，以保证上送报文不会因为控制器处理能力的不足而被丢弃。
目标控制器选择信息针对每个流表条目分别设置，是因为每个流表条目包含报文匹配信息并对应于某一类报文，控制器针对每个流表条目所对应的某一类报文来设置目标控制器选择能够为不同重要程度的上送报文选择不同类型的控制器。当然，也不排除目标控制器选择信息针对每个网元分别设置，这样设置可以实现基于网元设备的上送报文负载分担。
在一实施例中，该控制面设备将该指示信息携带于配置信息，将该配置信息发送到该网元设备，其中，该网元设备依据该配置信息生成多个流 表条目，并依据该指示信息将匹配该多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。配置信息用于配置网元设备的Flow Table，网元设备依据配置信息生成多个流表条目技术是相关技术，本实施例的重点是将指示信息携带于配置信息中，依据指示信息指示匹配每个流表条目的报文该上送到哪个控制器。
在一实施例中，该配置信息包括：Flow Table配置信息，该Flow Table配置信息用于指示该网元设备生成包含多个流表条目的Flow Table，并指示该网元设备依据该Flow Table配置信息将匹配该Flow Table中的部分或者全部流表条目的报文上送到该目标控制器。本实施例是配置信息的一种类型，控制面设备下发的指示信息可能只涉及部分流表条目，也可能涉及全部的流表条目。
网元设备接收到控制器发送的流表配置消息后，会根据流表配置消息的指示生成包含多个流表条目的Flow Table，并根据流表配置消息的指示给每个流表条目设置一个目标控制器选择。需要说明的是，并不是每个流表条目都会把报文发往目标控制器，但是考虑到之后控制器通过修改流表条目的指令使得匹配该流表条目的报文被发往目标控制器的可能性，给每个流表条目设置一个目标控制器选择是有必要的，当然，也不排除一开始只针对会把报文发往目标控制器的流表条目设置目标控制器选择。
在一实施例中，该控制面设备接收该网元设备向该控制面设备中的目标控制器发送的报文之前，该控制面设备对该报文进行验证，验证通过后接收所述报文，其中，在该报文为与该目标控制器对应的报文的情况下，确定该报文通过验证，否则确定该报文未通过验证。在一实施例中，该控制面设备验证该报文的报文头中的标识信息，其中，该标识信息是该网元设备依据该指示信息设置的，在该标识信息为与该目标控制器对应的标识信息的情况下，确定该报文通过验证，否则确定该报文未通过验证。
在一实施例中，控制面设备发送指示信息到SDN中的网元设备之前，该控制面设备依据预设规则确定该网元设备中不同类型的待传输报文的优先级，依据该优先级设置该指示信息。控制面设备依据预设规则确定待传输报文的优先级，该优先级可以是报文类型的重要程度，例如网络之间的 报文优先级高于网络内部的报文，比如边界网关协议(Border Gateway Protocol，简称BGP)报文的优先级高于链路层发现协议(Link Layer Discovery Protocol，简称LLDP)报文。报文的优先级高，指示信息中为该报文设置的上送目标控制器性能越好，或者是最适合该报文类型的控制器。
图4是根据本发明实施例的一种传输报文方法的流程图二，如图4所示，步骤如下：
步骤S402，SDN中的网元设备接收控制面设备下发的指示信息；
步骤S404，该网元设备依据该指示信息将待传输报文发送到该控制面设备中的目标控制器。
在一实施例中，网元设备接收控制面设备下发的指示信息，网元设备接收控制面设备下发的携带有指示信息的配置信息；该网元设备依据该配置信息生成多个流表条目，并依据该指示信息将匹配该多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
在一实施例中，依据该指示信息将待传输报文发送到该控制面设备中的目标控制器之前，该网元设备依据该指示信息设定该待传输报文的报文头中的标识信息，其中，在该标识信息通过该目标控制器验证的情况下，该目标控制器接收该待传输报文。对于需要被发往目标控制器的报文，网元设备根据报文所匹配流表条目的目标控制器选择信息来设置上送报文的报文头中的目标控制器选择字段，并把报文上送相应的控制器。当进入网元设备的报文完成流表匹配并根据流表指令需要被发往目标控制器时，网元设备会把需要上送的报文封装在报文上送消息中发往控制器，而具体发往哪个控制器则是由报文所匹配流表条目的目标控制器选择信息来决定的。
在上述实施例中，网元设备之所以要根据报文所匹配流表条目的目标控制器选择信息来设置上送报文的报文头中的目标控制器选择字段，是因为并不是所有网元设备在硬件上都具备把不同上送报文发往不同控制器的能力，那么对于不具备把不同上送报文发往不同控制器的能力的网元设备，可以通过设置上送报文的报文头中的目标控制器选择字段来指示目标控制器对接收到的上送报文进行过滤，使得目标控制器只处理选择了本控制器 的上送报文。
下面结合本发明两个具体实施例对本发明进行进一步说明。
具体实施例一
图5是根据本发明可选实施例的网元设备与相邻网络连接的示意图，如图5所示，网络A为包含三个控制器的SDN，三个控制器为一个Master Controller加上两个Equal Controller，网元设备1、网元设备2和网元设备3都位于网络A中；网络B既可以是SDN，也可以是非SDN，网元设备4、网元设备5和网元设备6都位于网络B中；网元设备3既与网元设备2相连，又与网元设备4相连，所以，网元设备3既会收到来自网元设备2的LLDP报文，又会收到来自网元设备4的BGP报文。SDN控制器(可以是三个控制器中的任意一个)通过扩展的OpenFlow协议对网元设备3上送报文的目标控制器选择进行设置。
在具体实施例一中，SDN控制器与网元设备3要执行如下步骤：
步骤1，控制器向网元设备3发送Flow Table配置消息，Flow Table配置消息中包含匹配BGP报文的流表条目、匹配LLDP报文的流表条目、匹配未成功匹配所有其它流表条目的(Table-miss)报文的流表条目，以及针对上述每个流表条目的目标控制器选择信息。
BGP报文、LLDP报文以及未成功匹配所有其它流表条目的报文都是网元设备3需要发往目标控制器进行处理的报文，为这三类上送报文选择不同的目标控制器可以实现上送报文的负载分担。而且，这三类上送报文对于网络的正常运行来说重要程度不同，其中，BGP报文的重要程度高于LLDP报文和未成功匹配所有其它流表条目的报文。于是，为BGP报文选择的目标控制器为Master Controller、为LLDP报文和未成功匹配所有其它流表条目的报文选择的目标控制器为Equal Controller，控制器向网元设备3发送的Flow Table配置消息中包含上述三类上送报文分别对应的流表条目及目标控制器选择。
步骤2，网元设备3接收到控制器发送的Flow Table配置消息后生成Flow Table，并依据流表配置消息配置针对每个流表条目的目标控制器选择。
图6是根据本发明可选实施例的网元设备3生成的流表内容示意图，如图6所示，网元设备3生成的流表包含3个流表条目，其中，第一个流表条目匹配的是BGP报文(TCP目的端口号(TCP_DST_PORT)＝179)，相应指令(Apply-Actions{Output Controller})为把匹配成功的BGP报文发往目标控制器，相应的目标控制器选择为Master Controller；第二个流表条目匹配的是LLDP报文(以太类型(EtherType)＝0x88CC)，相应指令(Apply-Actions{Output Controller})为把匹配成功的LLDP报文发往目标控制器，相应的目标控制器选择为Equal Controller；第三个流表条目匹配的是未成功匹配所有其它流表条目的报文(目的MAC地址(DST_MAC_ADDR)＝通配符，该流表条目优先级为0代表该流表条目最后匹配)，相应指令(Apply-Actions{Output Controller})为把未成功匹配所有其它流表条目的报文发往目标控制器，相应的目标控制器选择为Equal Controller。
步骤3，对于需要被发往目标控制器的报文，网元设备3根据报文所匹配流表条目的目标控制器选择信息来设置上送报文的报文头中的目标控制器选择字段，并把报文上送相应的控制器。
图7是根据本发明可选实施例的网元设备3发往目标控制器报文的格式示意图，如图7所示，网元设备3发往目标控制器报文的报文头中包含目标控制器选择字段，该字段的取值来自于该上送报文所匹配流表条目对应的目标控制器选择。
如果网元设备3支持把不同上送报文发往不同控制器的能力，则匹配第一个流表条目的BGP报文只会被上送到Master Controller，匹配第二个流表条目的LLDP报文和匹配第三个流表条目的未成功匹配所有其它流表条目的报文只会被上送到Equal Controller，而由于网络中存在两个Equal Controller，所以网元设备3会采用预置的上送报文负载分担算法把LLDP报文和未成功匹配所有其它流表条目的报文均衡地上送到两个Equal Controller，可能的预置的上送报文负载分担算法包括逐流轮换上送或逐包轮换上送等等。
如果网元设备3不支持把不同上送报文发往不同控制器的能力，则匹 配第一个流表条目的BGP报文、匹配第二个流表条目的LLDP报文和匹配第三个流表条目的未成功匹配所有其它流表条目的报文都会被同时上送到三个控制器，包括一个Master Controller和两个Equal Controller。Master Controller在接收到网元设备3上送的报文后，只会处理报文头中包含的目标控制器选择字段指示Master Controller的报文，而丢弃其它报文；Equal Controller在接收到网元设备3上送的报文后，只会处理报文头中包含的目标控制器选择字段指示Equal Controller的报文，而丢弃其它报文。
具体实施例二
图8是根据本发明可选实施例的网元设备与终端相连的示意图，如图8所示，网络C为包含三个控制器的SDN，三个控制器为一个Master Controller加上两个Equal Controller，网元设备7、网元设备8和网元设备9都位于网络C中；网元设备9既与网元设备8相连，又与终端相连，所以，网元设备9既会收到来自网元设备8的LLDP报文，又会收到来自终端的互联网控制消息协议(Internet Control Message Protocol，简称ICMP)报文。SDN控制器(可以是三个控制器中的任意一个)通过扩展的OpenFlow协议对网元设备9上送报文的目标控制器选择进行设置。
在具体实施例二中，SDN控制器与网元设备9要执行如下步骤：
步骤1，控制器向网元设备9发送流表配置消息，流表配置消息中包含匹配ICMP报文的流表条目、匹配LLDP报文的流表条目、匹配未成功匹配所有其它流表条目的(Table-miss)报文的流表条目，以及针对上述每个流表条目的目标控制器选择信息。
ICMP报文、LLDP报文以及未成功匹配所有其它流表条目的报文都是网元设备9需要发往目标控制器进行处理的报文，为这三类上送报文选择不同的目标控制器可以实现上送报文的负载分担。而且，这三类上送报文对于网络的正常运行来说重要程度不同，其中，ICMP报文的重要程度高于LLDP报文和未成功匹配所有其它流表条目的报文。于是，为ICMP报文选择的目标控制器为Master Controller、为LLDP报文选择的目标控制器为Equal Controller 1、为未成功匹配所有其它流表条目的报文选择的目标控制器为Equal Controller 2，控制器向网元设备9发送的流表配置消息中包含上 述三类上送报文分别对应的流表条目及目标控制器选择。
步骤2，网元设备9接收到控制器发送的流表配置消息后生成流表，并依据流表配置消息配置针对每个流表条目的目标控制器选择。
图9是根据本发明可选实施例的网元设备9生成的流表内容示意图，如图9所示，网元设备9生成的流表包含3个流表条目，其中，第一个流表条目匹配的是ICMP报文(IP协议号(IP_PROTOCOL_NUM)＝1)，相应指令(Apply-Actions{Output Controller})为把匹配成功的ICMP报文发往目标控制器，相应的目标控制器选择为Master Controller；第二个流表条目匹配的是LLDP报文(以太类型(EtherType)＝0x88CC)，相应指令(Apply-Actions{Output Controller})为把匹配成功的LLDP报文发往目标控制器，相应的目标控制器选择为Equal Controller 1；第三个流表条目匹配的是未成功匹配所有其它流表条目的报文(目的MAC地址(DST_MAC_ADDR)＝通配符，该流表条目优先级为0代表该流表条目最后匹配)，相应指令(Apply-Actions{Output Controller})为把未成功匹配所有其它流表条目的报文发往目标控制器，相应的目标控制器选择为Equal Controller 2。
步骤3，对于需要被发往目标控制器的报文，网元设备9根据报文所匹配流表条目的目标控制器选择信息来设置上送报文头中的目标控制器选择字段，并把报文上送相应的控制器。
图10是根据本发明可选实施例的网元设备9发往目标控制器报文的格式示意图，如图10所示，网元设备9发往目标控制器报文的报文头中包含目标控制器选择字段，该字段的取值来自于该上送报文所匹配流表条目对应的目标控制器选择。
如果网元设备9支持把不同上送报文发往不同控制器的能力，则匹配第一个流表条目的ICMP报文只会被上送到Master Controller，匹配第二个流表条目的LLDP报文只会被上送到Equal Controller 1、匹配第三个流表条目的未成功匹配所有其它流表条目的报文只会被上送到Equal Controller 2。
如果网元设备9不支持把不同上送报文发往不同控制器的能力，则匹配第一个流表条目的ICMP报文、匹配第二个流表条目的LLDP报文和匹 配第三个流表条目的未成功匹配所有其它流表条目的报文都会被同时上送到三个控制器，包括Master Controller、Equal Controller 1和Equal Controller2。Master Controller在接收到网元设备9上送的报文后，只会处理报文头中包含的目标控制器选择字段指示Master Controller的报文，而丢弃其它报文；Equal Controller 1在接收到网元设备9上送的报文后，只会处理报文头中包含的目标控制器选择字段指示Equal Controller 1的报文，而丢弃其它报文；Equal Controller 2在接收到网元设备9上送的报文后，只会处理报文头中包含的目标控制器选择字段指示Equal Controller 2的报文，而丢弃其它报文。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如只读存储器(Read-Only Memory，简称ROM)/随机存取存储器(Random Access Memory，简称RAM)、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本发明各个实施例该的方法。
实施例2
在本实施例中还提供了一种传输报文装置，该装置用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图11是根据本发明实施例的一种应用于控制面设备的传输报文的装置结构框图，如图11所示，该装置包括：
第一发送模块112，配置为发送指示信息到SDN中的网元设备，其中，该指示信息用于指示接收该网元设备所发送报文的目标控制器，且该目标控制器为该控制面设备中的控制器；
第一接收模块114，与该第一发送模块112连接，配置为接收该网元设 备向该控制面设备中的目标控制器发送的报文。
在一实施例中，该第一发送模块112还配置为将该指示信息携带于配置信息，将该配置信息发送到该网元设备，其中，该网元设备依据该配置信息生成多个流表条目，并依据该指示信息将匹配该多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
在一实施例中，该配置信息包括：流表配置信息，该流表配置信息用于指示该网元设备生成包含多个流表条目的流表，并指示该网元设备依据该流表配置信息将匹配该流表中的部分或者全部流表条目的报文上送到该目标控制器。
在一实施例中，该第一接收模块114还配置为在接收该网元设备向该控制面设备中的目标控制器发送的报文之前，对该报文进行验证，其中，在该报文为与该目标控制器对应的报文的情况下，确定该报文通过验证，否则确定该报文未通过验证，报文通过验证时接收所述报文。
在一实施例中，该第一接收模块114配置为验证该报文的报文头中的标识信息，其中，该标识信息是该网元设备依据该指示信息设置的，在该标识信息为与该目标控制器对应的标识信息的情况下，确定该报文通过验证，否则确定该报文未通过验证。
在一实施例中，该第一发送模块112还配置为在控制面设备发送指示信息到软件定义网络SDN中的网元设备之前，依据预设规则确定该网元设备中不同类型的待传输报文的优先级，依据该优先级设置该指示信息。
实际应用时，所述第一发送模块112及第一接收模块114可由传输报文的装置中处理器结合网络接口实现。
图12是根据本发明实施例的一种应用于SDN中的网元设备的传输报文装置结构框图，如图12所示，该装置包括：
第二接收模块122，配置为接收控制面设备下发的指示信息；
第二发送模块124，与第二接收模块122连接，配置为依据该指示信息将待传输报文发送到该控制面设备中的目标控制器。
在一实施例中，第二接收模块122还配置为接收控制面设备下发的携 带有指示信息的配置信息；
该第二发送模块124还配置为依据该配置信息生成多个流表条目，并依据该指示信息将匹配该多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
在一实施例中，该第二发送模块124还配置为在依据该指示信息将待传输报文发送到该控制面设备中的目标控制器之前，依据该指示信息设定该待传输报文的报文头中的标识信息，其中，在该标识信息通过该目标控制器验证的情况下，该目标控制器接收该待传输报文。
所述第二接收模块122及第二发送模块124可由传输报文的装置中处理器结合网络接口实现。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述各个模块以任意组合的形式分别位于不同的处理器中。
实施例3
根据本发明的另一个实施例，提供了一种传输报文系统，包括：控制面设备，SDN中的网元设备；其中，
该控制面设备配置为发送指示信息到该网元设备，其中，该指示信息配置为指示接收该网元设备所发送报文的目标控制器，且该目标控制器为该控制面设备中的控制器；
该网元设备接收该控制面设备下发的该指示信息；并依据该指示信息将待传输的报文发送到该控制面设备中的目标控制器；
该控制面设备接收该网元设备向该控制面设备中的目标控制器发送的该报文。
实施例4
本发明的实施例还提供了一种计算机可读存储介质。在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，发送指示信息到SDN中的网元设备，其中，该指示信息用于指示接收该网元设备所发送报文的目标控制器，且该目标控制器为控制面设备 中的控制器；
S2，接收该网元设备向该控制面设备中的目标控制器发送的报文。
或者，存储介质设置为存储用于执行以下步骤的程序代码：
S3，接收控制面设备下发的指示信息；
S4，依据该指示信息将待传输报文发送到该控制面设备中的目标控制器。
可选地，在一实施例中，上述存储介质可以包括但不限于：U盘、ROM、RAM、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
在一实施例中，处理器根据存储介质中已存储的程序代码执行上述实施例中的方法步骤。
也就是说，本发明实施例提供的计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现控制面设备侧方法的步骤，或者实现SDN中的网元设备侧方法的步骤。
本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
本发明实施例提供的方案，控制面设备下发指示信息到网元设备，指示网元设备将待上送的报文上送到控制面设备中的指定控制器，控制面设备可能有多个控制器，不同的控制器擅长处理不同类型报文，由控制面设备将多个控制器和待上送的报文进行统一管理，分别对应，多个控制器可以及时高效处理网元设备的报文，解决了相关技术中软件定义网络中上送的报文发生丢失的问题，保证了上送报文的传输质量。

Claims (18)

  1. 一种传输报文方法，包括：
    控制面设备发送指示信息到软件定义网络SDN中的网元设备，其中，所述指示信息用于指示目标控制器，所述目标控制器为接收所述网元设备所发送报文的控制器，且为所述控制面设备中的控制器；
    所述控制面设备接收所述网元设备向所述控制面设备中的目标控制器发送的报文。
  2. 根据权利要求1所述的方法，其中，所述方法还包括：
    所述控制面设备将所述指示信息携带于配置信息，将所述配置信息发送到所述网元设备，其中，所述配置信息用于指示所述网元设备生成多个流表条目，并指示将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
  3. 根据权利要求1所述的方法，其中，所述控制面设备接收所述网元设备向所述控制面设备中的目标控制器发送的报文之前，所述方法还包括：
    所述控制面设备对所述报文进行验证，其中，在所述报文为与所述目标控制器对应的报文的情况下，确定所述报文通过验证，接收所述报文。
  4. 根据权利要求3所述的方法，其中，所述控制面设备对所述报文进行验证包括：
    所述控制面设备验证所述报文的报文头中的标识信息，在所述标识信息为与所述目标控制器对应的标识信息的情况下，确定所述报文通过验证，否则确定所述报文未通过验证，其中，所述标识信息是所述网元设备依据所述指示信息设置的。
  5. 根据权利要求1所述的方法，其中，控制面设备发送指示信息到SDN中的网元设备之前，所述方法还包括：
    所述控制面设备依据预设规则确定所述网元设备中不同类型的待传输报文的优先级，依据所述优先级设置所述指示信息。
  6. 一种传输报文方法，包括：
    SDN中的网元设备接收控制面设备下发的指示信息；
    所述网元设备依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器。
  7. 根据权利要求6所述的方法，其中，所述网元设备接收控制面设备下发的指示信息，包括：
    网元设备接收控制面设备下发的携带有指示信息的配置信息；
    所述网元设备依据所述配置信息生成多个流表条目，并依据所述指示信息将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
  8. 根据权利要求6所述的方法，其中，依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器之前，所述方法还包括：
    所述网元设备依据所述指示信息设定所述待传输报文的报文头中的标识信息，其中，在所述标识信息通过所述目标控制器验证的情况下，所述目标控制器接收所述待传输报文。
  9. 一种传输报文装置，应用于控制面设备，包括：
    第一发送模块，配置为发送指示信息到SDN中的网元设备，其中，所述指示信息用于指示目标控制器，所述目标控制器为接收所述网元设备所发送报文的控制器，且为所述控制面设备中的控制器；
    第一接收模块，配置为接收所述网元设备向所述控制面设备中的目标控制器发送的报文。
  10. 根据权利要求9所述的装置，其中，所述第一发送模块还配置为将所述指示信息携带于配置信息，将所述配置信息发送到所述网元设备，其中，所述配置信息用于指示所述网元设备生成多个流表条目，并指示将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
  11. 根据权利要求9所述的装置，其中，所述第一接收模块还配置为在接收所述网元设备向所述控制面设备中的目标控制器发送的报文之前，对所述报文进行验证，其中，在所述报文为与所述目标控制器对应的报文 的情况下，确定所述报文通过验证，接收所述报文。
  12. 根据权利要求11所述的装置，其中，所述第一接收模块配置为验证所述报文的报文头中的标识信息，在所述标识信息为与所述目标控制器对应的标识信息的情况下，确定所述报文通过验证，否则确定所述报文未通过验证，其中，所述标识信息是所述网元设备依据所述指示信息设置的。
  13. 根据权利要求9所述的装置，其中，所述第一发送模块还配置为在控制面设备发送指示信息到SDN中的网元设备之前，依据预设规则确定所述网元设备中不同类型的待传输报文的优先级，依据所述优先级设置所述指示信息。
  14. 一种传输报文装置，应用于SDN中的网元设备，包括：
    第二接收模块，配置为接收控制面设备下发的指示信息；
    第二发送模块，配置为依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器。
  15. 根据权利要求14所述的装置，其中，第二接收模块还配置为接收控制面设备下发的携带有指示信息的配置信息；
    所述第二发送模块还配置为依据所述配置信息生成多个流表条目，并依据所述指示信息将匹配所述多个流表条目中的部分或者全部流表条目的报文上送到目标控制器。
  16. 根据权利要求14所述的装置，其中，所述第二发送模块还配置为在依据所述指示信息将待传输报文发送到所述控制面设备中的目标控制器之前，依据所述指示信息设定所述待传输报文的报文头中的标识信息，其中，在所述标识信息通过所述目标控制器验证的情况下，所述目标控制器接收所述待传输报文。
  17. 一种传输报文系统，包括：控制面设备，SDN中的网元设备；
    所述控制面设备配置为发送指示信息到所述网元设备，其中，所述指示信息用于指示目标控制器；所述目标控制器为接收所述网元设备所发送报文的控制器，且为所述控制面设备中的控制器；
    所述网元设备，配置为接收所述控制面设备下发的所述指示信息；以及依据所述指示信息将待传输的报文发送到所述控制面设备中的目标控制器；
    所述控制面设备，还配置为接收所述网元设备向所述控制面设备中的目标控制器发送的所述报文。
  18. 一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现权利要求1至5任一项所述方法的步骤，或者实现权利要求6至8任一项所述方法的步骤。
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