CN103036653A - Method of network coding for Open Flow networks - Google Patents
Method of network coding for Open Flow networks Download PDFInfo
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- CN103036653A CN103036653A CN2012105722486A CN201210572248A CN103036653A CN 103036653 A CN103036653 A CN 103036653A CN 2012105722486 A CN2012105722486 A CN 2012105722486A CN 201210572248 A CN201210572248 A CN 201210572248A CN 103036653 A CN103036653 A CN 103036653A
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Abstract
The invention relates to the technical field of network coding and discloses a method of network coding for Open Flow networks. The method of network coding for the Open Flow networks includes: if Open Flow switchboard supports network coding, then a controller obtains network coding configuration parameters of the Open Flow switchboard. When the Open Flow switchboard receives a data packet, the Open Flow switchboard matches the data packet with a flow table and judges whether coding strategy for the data packet exists in the Open Flow switchboard or not. If coding strategy for the data packet does not exist in the Open Flow switchboard, the data packet is sent to the controller, the controller designs the coding strategy for the data packet, and the controller sends the coding strategy back to the Open Flow switchboard. Practicability of the Open Flow switchboard and the controller in network is improved with the method of network coding for Open Flow networks including relevant coding interactive behavior of the Open Flow switchboard and the controller.
Description
Technical field
The present invention relates to the network coding technique field, mainly be applicable to the OpenFlow network is carried out the method for network code.
Background technology
Therefore constantly along with developing rapidly of Internet technology, the number of services of the network carrying is increasingly huge, and class of business is increasingly sophisticated, and network size also increases, and this is so that the network disadvantage that causes based on the functional design defective of legacy network architectural framework is day by day obvious.Present network efficiency is low, is difficult to expansion, all can't satisfy the day by day harsh demand of user at aspects such as network service quality, fail safe, manageabilitys.For the present problem that runs into, the software defined network (Software Defined Networking, SDN) that the people such as Nick professor McKeown proposed in 2007.OpenFlow is the core technology that realizes SDN, OpenFlow is converted into the flow forwarding mode of describing based on multiple domain net bag packet header with original message repeating mode of being controlled by switch/router fully, traditional control plane is peeled off out from forwarding unit simultaneously, the decision-making of all forwarding behaviors has all been moved on certain Centralized Controller, has realized separating of data retransmission and route control.The OpenFlow network configuration specifically as shown in Figure 1, mainly formed by OpenFlow switch 02 and OpenFlow controller 01, in the OpenFlow network configuration, OpenFlow switch 02 mainly is made of stream table 03, escape way 04 and OpenFlow agreement 05 3 parts.Wherein, stream table 03 is used for carrying out searching and transmitting of packet.Escape way 04 is to connect OpenFlow switch 02 to the interface of OpenFlow controller 01.OpenFlow switch 02 and OpenFlow controller 01 communicate by escape way 04, and all information must be carried out according to the form of OpenFlow agreement 05 regulation.OpenFlow agreement 05 is used for describing the standard of mutual used information between OpenFlow controller 01 and the OpenFlow switch 02, and the interface standard of OpenFlow controller 01 and OpenFlow switch 02.The core of agreement is the set for OpenFlow agreement 05 message structure.OpenFlow controller 01 is the brain of whole system, comprises the basic operations such as interpolation, modification and deletion of flowing list item by the stream table 03(that controls in its OpenFlow switch 02 of administering) be responsible for the control logic of whole network.The logic function of various operations is based on the OpenFlow controller 01 that the control program of operation realizes.
Since 2000 propose to introduce network code (Network Coding) in the network service first, because network code can bring and promote network throughput, balance network load, raising bandwidth availability ratio, improve a series of benefits such as network linking robustness and minimizing network management overhead, the research of the aspects such as the routing Design of coding Network Based, contents distribution, storage launches successively, and has obtained numerous achievements in research with practicality.Network code has been widely used in the fields such as Ad-hoc network, sensor network, P2P shared file system, distributed document storage and network security at present.
In August, 2012, the people such as Felici á n N é meth attempted network code is applied to the OpenFlow network first, and had obtained by experiment success, had confirmed to use at the OpenFlow network feasibility of network code.But they have just realized the network code mode of XOR in butterfly networks, the OpenFlow switch is carried out corresponding encoding and decoding to be changed, still need by manual static configuration OpenFlow switch stream table, not in the change of OpenFlow controller proposition corresponding to network code.The application network coding also is in the stage at the early-stage in the OpenFlow network at present, and still there are not a lot of problems to be solved in ripe achievement in research, and is domestic also not to this relevant research.The code capacity of OpenFlow switch is not fully exerted, and the OpenFlow controller does not play corresponding effect in present network code.Existing network code based on OpenFlow is the coding that OpenFlow switch self carries out according to the coded system of setting at present, does not carry out the interbehavior of relevant coding with the OpenFlow controller.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of the OpenFlow network being carried out network code, it can make OpenFlow switch and OpenFlow controller carry out the interbehavior of relevant coding, thereby improves OpenFlow switch in the OpenFlow network and the practicality of OpenFlow controller.
For solving the problems of the technologies described above, the invention provides a kind of method that the OpenFlow network is carried out network code and comprise:
If OpenFlow switch network enabled coding, then the OpenFlow controller obtains the network code configuration parameter of described OpenFlow switch;
When the OpenFlow switch receives packet, described packet is flowed the table coupling, and judge the coding strategy that whether has packet in the OpenFlow switch;
If there is not the coding strategy of packet in the OpenFlow switch, then Packet Generation is arrived described OpenFlow controller, by the coding strategy of OpenFlow controller design data bag, and described coding strategy is sent back to the OpenFlow switch, by the OpenFlow switch responds.
Further, also comprise: at first whether network enabled is encoded by OpenFlow controller inquiry OpenFlow switch;
Described OpenFlow switch is answered described inquiry;
If OpenFlow switch network enabled coding, then described OpenFlow controller obtains the network code configuration parameter of OpenFlow switch.
Further, the network code configuration parameter that described OpenFlow controller obtains the OpenFlow switch comprises: described OpenFlow controller is inquired the network code configuration parameter of described OpenFlow switch, and the OpenFlow switch is replied the network code configuration parameter of self again.
Further, the described OpenFlow controller network code configuration parameter that obtains the OpenFlow switch comprises: described OpenFlow controller directly arranges the network code configuration parameter of described OpenFlow switch.
Further, described coding strategy is sent back to the OpenFlow switch after, described OpenFlow controller is beamed back described OpenFlow switch with the behavioral strategy of the described packet that receives and packet, by the OpenFlow switch responds; Wherein, described behavioral strategy comprises: coding behavior and decoding behavior.
Further, at described coding strategy by OpenFlow controller design data bag, and coding strategy is sent back to the OpenFlow switch, after the OpenFlow switch responds, if described OpenFlow controller receives the abnormal information that is sent by described OpenFlow switch, the coding situation of OpenFlow controller inquiry OpenFlow switch, and the coding strategy of redesign OpenFlow switch send back to the OpenFlow switch with described coding strategy again.
Further, it is described when the OpenFlow switch receives packet, packet is flowed the table coupling, and judge the coding strategy that whether has packet in the OpenFlow switch, comprise: when described OpenFlow switch receives packet, described packet is flowed the table coupling, and judge the coding strategy that whether has packet in the OpenFlow switch;
If have the coding strategy of packet in the OpenFlow switch, then directly packet responded.
Further, described coding strategy is sent back to the OpenFlow switch, by the OpenFlow switch responds, comprising: described coding strategy is sent back to described OpenFlow switch, and the OpenFlow switch is revised the stream table of self according to the coding strategy that receives.
Further, described network code configuration parameter comprises: the network code type of OpenFlow switch support, the maximum data packet number of a coding-decoding operation support and the time-to-live for the treatment of the codec data bag in the OpenFlow switch.
Further, described abnormal information comprises: stream table overtime deletion information, port change information and encoding and decoding error message.
Beneficial effect of the present invention is:
The method of network code that the OpenFlow network is carried out provided by the invention is by expanding the escape way agreement in the OpenFlow network, again in conjunction with the Route control of network coding technique and the OpenFlow controller of OpenFlow switch, on the basis that does not change OpenFlow system management performance, optimize the performance that the resource of network link is distributed, thereby improved OpenFlow switch in the OpenFlow network and the practicality of OpenFlow controller.
Description of drawings
Fig. 1 is the frame diagram of OpenFlow network.
The OpenFlow network that Fig. 2 provides for the embodiment of the invention carries out the flow chart of the method for network code.
The OpenFlow network that Fig. 3 provides for the embodiment of the invention carries out the traffic diagram that OpenFlow controller in the method for network code obtains the network code configuration parameter of OpenFlow switch.
When the OpenFlow network that Fig. 4 provides for the embodiment of the invention carries out that the OpenFlow controller designs coding strategy for packet in the method for network code, with the traffic diagram of OpenFlow switch.
The OpenFlow network that Fig. 5 provides for the embodiment of the invention carries out after the OpenFlow controller obtains abnormal information in the method for network code, with the traffic diagram of OpenFlow switch.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, embodiment and operation principle that the OpenFlow network is carried out the method for network code that foundation the present invention is proposed are elaborated.
As shown in Figure 2, the method that the OpenFlow network is carried out network code provided by the invention comprises:
The OpenFlow controller inquires first the OpenFlow switch whether network enabled is encoded;
The OpenFlow switch is answered inquiry;
If OpenFlow switch network enabled coding, then the OpenFlow controller obtains the network code configuration parameter of OpenFlow switch; In the present embodiment, the OpenFlow controller can obtain by dual mode the network code configuration parameter of OpenFlow switch; First kind of way is the network code configuration parameter of OpenFlow controller inquiry OpenFlow switch, and the OpenFlow switch is replied the network code configuration parameter of self again; The second way is that the OpenFlow controller directly arranges the network code configuration parameter of OpenFlow switch.Wherein, the network code configuration parameter comprises: the network code type of OpenFlow switch support, the maximum data packet number of a coding-decoding operation support and the time-to-live for the treatment of the codec data bag in the OpenFlow switch.
If the OpenFlow switch is the network enabled coding not, then do not carry out any operation.
OpenFlow controller and OpenFlow switch send mutually message every the specific time, and whether inquiry keeps connecting.If the OpenFlow controller keeps being connected with the OpenFlow switch, illustrate that then the OpenFlow controller is connected normally with the OpenFlow switch, can carry out subsequent operation; Hence one can see that, and whether the OpenFlow controller keeps connecting the change situation that can grasp in real time network topology structure by inquiry OpenFlow switch.Wherein, the specific time is determined by size and the complexity of OpenFlow controller according to network.
When the OpenFlow switch receives packet, packet is flowed the table coupling, and judge the coding strategy that whether has packet in the OpenFlow switch;
If there is not the coding strategy of packet in the OpenFlow switch, then the packet header with packet sends to the OpenFlow controller, by the coding strategy of OpenFlow controller design data bag, and with the design coding strategy be sent back to the OpenFlow switch.At this moment, the OpenFlow controller is connected to inquire whether keep connecting with the OpenFlow switch.If do not keep connecting, then EO; If keep to connect, then the OpenFlow controller is beamed back the OpenFlow switch with the packet that receives and the behavioral strategy of packet, by the OpenFlow switch responds; Concrete, the OpenFlow switch is revised the stream table of self according to the coding strategy that receives.Wherein, behavioral strategy comprises: coding behavior and decoding behavior.Need to prove, after the OpenFlow controller is sent back to the OpenFlow switch with coding strategy, if the OpenFlow controller receives the abnormal information of being sent by the OpenFlow switch, the coding situation of OpenFlow controller inquiry OpenFlow switch, and the coding strategy of redesign OpenFlow switch, again coding strategy is sent back to the OpenFlow switch.Wherein, abnormal information comprises: stream table overtime deletion information, port change information and encoding and decoding error message.
If have the coding strategy of packet in the OpenFlow switch, then directly packet responded.
Realize OpenFlow network of network coding by the method that the OpenFlow network is carried out network code provided by the invention, when carrying out network code, OpenFlow controller and OpenFlow switch at first need initialize communications.As shown in Figure 3, OpenFlow controller 01 and OpenFlow switch 02-1, OpenFlow switch 02-2 mutually send apply for information, and obtain connection.Then, whether network enabled is encoded for OpenFlow controller 01 inquiry OpenFlow switch 02-1 and OpenFlow switch 02-2.The OpenFlow switch is responded the network code type that self supports.Wherein, the network code type comprises: XOR coding and random linear network encoding.The network code configuration parameter of subsequently OpenFlow controller 01 inquiry or configuration OpenFlow switch, the OpenFlow switch is replied the network code configuration parameter of self again; Then, OpenFlow controller 01 sends mutually message with the OpenFlow interchanger every the specific time, and whether inquiry keeps connecting.If OpenFlow controller 01 keeps being connected with the OpenFlow switch, then can carry out subsequent operation.
As shown in Figure 4, when OpenFlow switch 02-1 receives packet, first packet is flowed the table coupling, judge again the coding strategy that whether has packet among the OpenFlow switch 02-1; If there is not the coding strategy of packet among the OpenFlow switch 02-1, then the packet header with packet sends to OpenFlow controller 01.OpenFlow controller 01 is formulated the coding strategy that makes new advances according to the routing algorithm of self, then the coding strategy of making is sent to OpenFlow switch 02-1 and OpenFlow switch 02-2; Whether inquiry keeps connecting again.If keep connecting, then OpenFlow controller 01 sends to OpenFlow switch 02-1 with the behavioral strategy of former packet and packet, by the OpenFlow switch responds; OpenFlow controller 01 inquires whether the coding behavior is finished on the OpenFlow switch again, if finish, then the OpenFlow switch is replied and finished message.As shown in Figure 5, after OpenFlow switch 02-2 receives the coding strategy that is sent by OpenFlow controller 01, if find that unusual condition is arranged, then abnormal information is sent to OpenFlow controller 01.OpenFlow controller 01 receives abnormal information, the coding situation of inquiry OpenFlow switch.This moment, OpenFlow controller 01 was connected to inquire whether keep connecting with the OpenFlow switch.If keep connecting, then OpenFlow controller 01 sends to the OpenFlow switch with the coding strategy of the OpenFlow switch of redesign, is responded by the OpenFlow switch.OpenFlow controller 01 inquires whether the coding behavior is finished on the OpenFlow switch again, if finish, then the OpenFlow switch is replied and finished message.
The method of network code that the OpenFlow network is carried out provided by the invention is by expanding the escape way agreement in the OpenFlow network, again in conjunction with the Route control of network coding technique and the OpenFlow controller of OpenFlow switch, on the basis that does not change OpenFlow system management performance, optimize the performance that the resource of network link is distributed, thereby improved OpenFlow switch in the OpenFlow network and the practicality of OpenFlow controller.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. one kind is carried out the method for network code to the OpenFlow network, it is characterized in that, comprising:
If OpenFlow switch network enabled coding, then the OpenFlow controller obtains the network code configuration parameter of described OpenFlow switch;
When the OpenFlow switch receives packet, described packet is flowed the table coupling, and judge the coding strategy that whether has packet in the OpenFlow switch;
If there is not the coding strategy of packet in the OpenFlow switch, then Packet Generation is arrived described OpenFlow controller, by the coding strategy of OpenFlow controller design data bag, and described coding strategy is sent back to the OpenFlow switch, by the OpenFlow switch responds.
2. as claimed in claim 1 the OpenFlow network is carried out the method for network code, it is characterized in that, also comprise: at first by OpenFlow controller inquiry OpenFlow switch network enabled coding whether;
Described OpenFlow switch is answered described inquiry;
If OpenFlow switch network enabled coding, then described OpenFlow controller obtains the network code configuration parameter of OpenFlow switch.
3. method of the OpenFlow network being carried out network code as claimed in claim 1 or 2, it is characterized in that, the network code configuration parameter that described OpenFlow controller obtains the OpenFlow switch comprises: described OpenFlow controller is inquired the network code configuration parameter of described OpenFlow switch, and the OpenFlow switch is replied the network code configuration parameter of self again.
4. method of the OpenFlow network being carried out network code as claimed in claim 1 or 2, it is characterized in that the network code configuration parameter that described OpenFlow controller obtains the OpenFlow switch comprises: described OpenFlow controller directly arranges the network code configuration parameter of described OpenFlow switch.
5. method of the OpenFlow network being carried out network code as claimed in claim 1 or 2, it is characterized in that, described coding strategy is sent back to the OpenFlow switch after, described OpenFlow controller is beamed back described OpenFlow switch with the behavioral strategy of the described packet that receives and packet, by the OpenFlow switch responds; Wherein, described behavioral strategy comprises: coding behavior and decoding behavior.
6. method of the OpenFlow network being carried out network code as claimed in claim 1 or 2, it is characterized in that, at described coding strategy by OpenFlow controller design data bag, and coding strategy is sent back to the OpenFlow switch, after the OpenFlow switch responds, if described OpenFlow controller receives the abnormal information that is sent by described OpenFlow switch, the coding situation of OpenFlow controller inquiry OpenFlow switch, and the coding strategy of redesign OpenFlow switch, more described coding strategy is sent back to the OpenFlow switch.
7. method of the OpenFlow network being carried out network code as claimed in claim 1, it is characterized in that, it is described when the OpenFlow switch receives packet, packet is flowed the table coupling, and judge the coding strategy that whether has packet in the OpenFlow switch, comprise: when described OpenFlow switch receives packet, described packet is flowed the table coupling, and judge the coding strategy that whether has packet in the OpenFlow switch;
If have the coding strategy of packet in the OpenFlow switch, then directly packet responded.
8. method of the OpenFlow network being carried out network code as claimed in claim 1, it is characterized in that, described coding strategy is sent back to the OpenFlow switch, by the OpenFlow switch responds, comprise: described coding strategy is sent back to described OpenFlow switch, and the OpenFlow switch is revised the stream table of self according to the coding strategy that receives.
9. method of the OpenFlow network being carried out network code as claimed in claim 1, it is characterized in that described network code configuration parameter comprises: the network code type of OpenFlow switch support, the maximum data packet number of a coding-decoding operation support and the time-to-live for the treatment of the codec data bag in the OpenFlow switch.
10. as claimed in claim 6 the OpenFlow network is carried out the method for network code, it is characterized in that described abnormal information comprises: stream table overtime deletion information, port change information and encoding and decoding error message.
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| WO2016077948A1 (en) * | 2014-11-17 | 2016-05-26 | 华为技术有限公司 | Switch port control method, apparatus and system |
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| CN104486209A (en) * | 2014-12-12 | 2015-04-01 | 上海斐讯数据通信技术有限公司 | Message transmission system and message transmission method of OpenFlow protocol network |
| CN105391690A (en) * | 2015-10-19 | 2016-03-09 | 中国科学院信息工程研究所 | POF-based network eavesdropping defending method and system |
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| CN106506264A (en) * | 2016-10-31 | 2017-03-15 | 中国科学院信息工程研究所 | A kind of self-defining data bag method of sampling based on SDN |
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| CN107196860A (en) * | 2017-05-23 | 2017-09-22 | 西南交通大学 | The method that network code carries out multicast transmission in SDN |
| CN107196860B (en) * | 2017-05-23 | 2021-06-04 | 西南交通大学 | Method for multicast transmission of network codes in SDN network |
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