CN104468231A - SDN interchanger and controller dynamic registration method - Google Patents
SDN interchanger and controller dynamic registration method Download PDFInfo
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- CN104468231A CN104468231A CN201410806658.1A CN201410806658A CN104468231A CN 104468231 A CN104468231 A CN 104468231A CN 201410806658 A CN201410806658 A CN 201410806658A CN 104468231 A CN104468231 A CN 104468231A
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Abstract
The invention discloses an SDN interchanger and controller dynamic registration method. The SDN interchanger and controller dynamic registration method comprises the following steps that S1, an SDN is initialized, an external configuration module informs an interchange and n controllers to establish TCP connection, and main connection is established between the interchanger and one controller and auxiliary connection is established between the interchanger and other controllers according to the priority algorithm; S2, when the main connection becomes abnormal, the interchanger sends a registration application message to one of the other controllers randomly; S3, a certain controller of the other controllers returns a registration agreeing message to the interchanger, and then new main connection is established between the controller and the interchanger. According to the SDN interchanger and controller dynamic registration method, when a fault occurs, normal services of the interchanger are not affected, and the reliability of the SDN controllers is greatly improved; meanwhile, seamless and rapid switching can be achieved, load balancing of the controllers is achieved, the method is simple and effective, and the burden of the controller is prevented from being increased.
Description
Technical field
The present invention relates to the method for a kind of SDN switch registration, particularly a kind of SDN switch and controller dynamic registration method.
Background technology
SDN(Software Defined Network, software defined network) one of core concept be that controlling functions is stripped out from the network switching equipment, thus reach reduction equipment complexity, promote the object of network management and control efficiency.The forwarding decision of the SDN switch of " going intellectuality " to packet comes from the southbound interface of controller.The control plane of switching equipment moves in the controller of centralization by SDN technology, utilizes standardized southbound interface to substituted for control plane in switching equipment.Therefore whether SDN switch and controller be efficient and simple alternately, and what become particularly is important.
Because the scale of SDN is more and more huger, the distributed type assemblies that many motors control device is formed will replace single controller.Present implementation, there is not dynamic registration algorithm in SDN switch and controller, but by OF-Config or OVSDB protocol configuration SDN Controller address, then sets up TCP and connect.There is very large integrity problem in this implementation.Once controller breaks down, SDN switch can not other controllers of Active Registration, thus cause this SDN switch to be in without controlled state, have influence on normal business.
And now active and standby controller technology mainly solves the problem that master controller breaks down, if in the link fails of controller and switch, be difficult to link failure effectively be detected, carry out active-standby switch.Although active and standby controller technology can solve the integrity problem of single-point controller well, autgmentability difference cannot be overcome, the problem that the transmission delay of poor performance and OpenFlow packet is large.
Summary of the invention
The object of this invention is to provide a kind of SDN switch and controller dynamic registration method, when breaking down, the regular traffic of switch can not be affected, greatly improve the reliability of SDN controller, can realize seamless and switch rapidly simultaneously, realize the load balancing of controller, the method is simply effective, without the need to increasing the burden of controller.
In order to realize above object, the present invention is achieved by the following technical solutions:
A kind of SDN switch and controller dynamic registration method, comprise following steps:
S1:SDN netinit, outside Configuration Manager informs that switch is set up TCP with n platform controller and is connected, and by priority algorithm, switch sets up main connection with a controller, sets up auxiliary connection with other controllers;
S2: described main connection occurs abnormal, switch sends application for registration message in other controllers at random;
S3: in other controllers, certain controller is replied to switch and agreed to logon message, then this controller and switch set up new to be mainly connected.
In described S1, described priority algorithm comprises following sub-step:
During S1.1:SDN netinit, switch is set up TCP with n platform controller and is connected, generation array (1,2,3 ... n) the corresponding n platform controller of difference;
S1.2: according to array (1,2,3 ... n), generate n numeral in the corresponding array of new n random number, namely n random number distinguishes corresponding n platform controller, as the 1st priority to n-th controller;
S1.3: the controller that switch selects priority maximum sends application for registration message;
S1.4: if this controller is replied agree to logon message, then this controller and switch set up main connection.
Described S1 also comprises following sub-step: S1.5: if if refusal logon message replied by controller, then switch is according to the controller transmission application for registration message of the order of decreasing priority to correspondence, until set up main connection with certain controller.
In described S2 main connect occur abnormal reason including but not limited to: controller breaks down, the link of switch and controller occurs abnormal.
Application for registration message that described switch sends to controller is including but not limited to the IP address of switch, the MAC Address of switch.
The described controller agreement logon message of replying is including but not limited to the IP address of controller.
Change at the database of a controller, then the automatic real-time synchronization of database of described n platform controller upgrades; Standby the dividing of n platform controller dereliction, the channel between controller is used for synchronous and adopts proprietary Fast Ethernet passage or bus.
Described every platform switch only and a controller set up main connection, and auxiliary connection set up by some controllers, and during described main connection work, auxiliary connection does not carry data.
Described S3 comprises following sub-step:
S3.1: the maximum main linking number that setting separate unit controller is set up;
S3.2: the application for registration message that controller desampler sends, if the main linking number of controller equals maximum main linking number, then replys refusal logon message; Otherwise then reply and agree to logon message, set up main connection with switch, the main linking number of this controller adds 1.
The present invention compared with prior art, has the following advantages:
When breaking down, can not affect the regular traffic of switch, greatly improving the reliability of SDN controller, can realize seamless and switch rapidly simultaneously, realizing the load balancing of controller, the method is simply effective, without the need to increasing the burden of controller.
Accompanying drawing explanation
Fig. 1 is the connection status schematic diagram of SDN switch of the present invention and controller;
Fig. 2 is the method flow diagram of SDN switch of the present invention and controller dynamic registration method;
Fig. 3 is the flow chart of the priority algorithm of SDN switch of the present invention and controller dynamic registration method;
Fig. 4 is the flow chart of the S3 of SDN switch of the present invention and controller dynamic registration method.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
A kind of SDN switch and controller dynamic registration method, as shown in Figure 2, comprise following steps:
S1:SDN netinit, outside Configuration Manager informs that switch is set up TCP with n platform controller and is connected, and by priority algorithm, switch sets up main connection with a controller, sets up auxiliary connection with other controllers.As shown in Figure 3, the step of this step medium priority algorithm is:
During S1.1:SDN netinit, switch is set up TCP with n platform controller and is connected, generation array (1,2,3 ... n) the corresponding n platform controller of difference;
S1.2: according to array (1,2,3 ... n), generate n numeral in the corresponding array of new n random number, namely n random number distinguishes corresponding n platform controller, as the 1st priority to n-th controller;
S1.3: the controller that switch selects priority maximum sends application for registration message (Register); In the present embodiment, the switch application for registration message that sends to controller is including but not limited to the IP address of switch, the MAC Address of switch.
S1.4: if this controller is replied agree to logon message (Register Reply(OK)), then this controller and switch set up main connection; In the present embodiment, the controller agreement logon message of replying is including but not limited to the IP address of controller.
S1.5: if if refusal logon message (Register Reply(NOK) replied by controller), then switch is according to the controller transmission application for registration message of the order of decreasing priority to correspondence, until set up main connection with certain controller.
S2: when the main connection in step 1 occurs abnormal, switch sends application for registration message in other controllers at random; Main connect occur abnormal reason including but not limited to: controller breaks down, the link of switch and controller occurs abnormal.
S3: in other controllers, certain controller is replied to switch and agreed to logon message, then this controller and switch set up new to be mainly connected, and refer to Fig. 1.As shown in Figure 4, the concrete steps of this step are as follows:
S3.1: the maximum main linking number (that is: threshold value) that setting separate unit controller is set up; In the present embodiment, the main linking number that controller is set up can only be less than or equal to maximum main linking number, but maximum main linking number can be modified based on the network application of reality.Due to switch adopt Stochastic choice algorithm and controller maximum number of connections is fixing, the flow of therefore thousands of switches can be shared and going above many motors control device, thus realizes the load balancing of controller.
S3.2: the application for registration message that controller desampler sends, if the main linking number of controller equals maximum main linking number, then replys refusal logon message; Otherwise then reply and agree to logon message, set up main connection with switch, the main linking number of this controller adds 1.
In the present embodiment, change at the database of a controller, then the automatic real-time synchronization of the database of n platform controller upgrades, controller be synchronously divided into real-time synchronization and cycle synchronisation, real-time synchronization is increment synchronization, cause the factor of real-time synchronization including but not limited to 4 points: statistical information changes, composer changes, and north orientation application change and the message from switch change; Cycle synchronisation is the synchronous of full database, because spended time is longer, answers background process.Standby the dividing of n platform controller dereliction, the channel between controller is used for synchronous and adopts proprietary Fast Ethernet passage or bus.Database due to all controllers is synchronous, to other controllers, therefore can accomplish seamlessly to switch, improve the reliability of controller node largely when a controller breaks down time without the need to derived data again.
And in order to obtain efficient search efficiency, the database of controller adopts Hash tissue, hash key to be adopt discrete logarithm to generate according to the IP address of switch and MAC Address.Except connection type, the data-base content of each controller should be consistent.Hash array size according to the demand of networking, can be modified.In order to obtain efficient recall precision, the degree of depth of chained list should more than 5 grades.
In the present embodiment, every platform switch only sets up main connection with a controller, and auxiliary connection set up by some controllers, and when main connection work, auxiliary connection does not carry data.Only have when connection type is main connection time, controller just can configure and manage switch, just can effectively the traffic sharing of thousands of switches be gone above many motors control device.
In sum, SDN switch of the present invention and controller dynamic registration method, when breaking down, the regular traffic of switch can not be affected, greatly improve the reliability of SDN controller, can realize seamless and switch rapidly simultaneously, realizing the load balancing of controller, the method is simply effective, without the need to increasing the burden of controller.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. SDN switch and a controller dynamic registration method, is characterized in that, comprise following steps:
S1:SDN netinit, outside Configuration Manager informs that switch is set up TCP with n platform controller and is connected, and by priority algorithm, switch sets up main connection with a controller, sets up auxiliary connection with other controllers;
S2: described main connection occurs abnormal, switch sends application for registration message in other controllers at random;
S3: in other controllers, certain controller is replied to switch and agreed to logon message, then this controller and switch set up new to be mainly connected.
2. SDN switch as claimed in claim 1 and controller dynamic registration method, it is characterized in that, in described S1, described priority algorithm comprises following sub-step:
During S1.1:SDN netinit, switch is set up TCP with n platform controller and is connected, generation array (1,2,3 ... n) the corresponding n platform controller of difference;
S1.2: according to array (1,2,3 ... n), generate n numeral in the corresponding array of new n random number, namely n random number distinguishes corresponding n platform controller, as the 1st priority to n-th controller;
S1.3: the controller that switch selects priority maximum sends application for registration message;
S1.4: if this controller is replied agree to logon message, then this controller and switch set up main connection.
3. SDN switch as claimed in claim 2 and controller dynamic registration method, it is characterized in that, described S1 also comprises following sub-step: S1.5: if if refusal logon message replied by controller, then switch is according to the controller transmission application for registration message of the order of decreasing priority to correspondence, until set up main connection with certain controller.
4. SDN switch as claimed in claim 1 and controller dynamic registration method, is characterized in that, in described S2 main connect occur abnormal reason including but not limited to: controller breaks down, the link of switch and controller occurs abnormal.
5. SDN switch as claimed in claim 1 and controller dynamic registration method, is characterized in that, application for registration message that described switch sends to controller is including but not limited to the IP address of switch, the MAC Address of switch.
6. the SDN switch as described in claim 1 or 5 and controller dynamic registration method, is characterized in that, the described controller agreement logon message of replying is including but not limited to the IP address of controller.
7. SDN switch as claimed in claim 1 and controller dynamic registration method, is characterized in that, change at the database of a controller, then the automatic real-time synchronization of database of described n platform controller upgrades; Standby the dividing of n platform controller dereliction, the channel between controller is used for synchronous and adopts proprietary Fast Ethernet passage or bus.
8. SDN switch as claimed in claim 1 and controller dynamic registration method, it is characterized in that, described every platform switch only sets up main connection with a controller, and auxiliary connection set up by some controllers, during described main connection work, auxiliary connection does not carry data.
9. SDN switch as claimed in claim 1 and controller dynamic registration method, it is characterized in that, described S3 comprises following sub-step:
S3.1: the maximum main linking number that setting separate unit controller is set up;
S3.2: the application for registration message that controller desampler sends, if the main linking number of controller equals maximum main linking number, then replys refusal logon message; Otherwise then reply and agree to logon message, set up main connection with switch, the main linking number of this controller adds 1.
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| CN107179912B (en) * | 2017-06-07 | 2020-09-01 | 广州市品高软件股份有限公司 | Hot upgrading method for distributed architecture software defined network controller |
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| CN108881059B (en) * | 2018-05-29 | 2022-05-24 | 新华三技术有限公司 | Controller role determination method, network switching equipment, controller and network system |
| CN110321175A (en) * | 2019-07-05 | 2019-10-11 | 武汉斗鱼鱼乐网络科技有限公司 | A kind of controller initial method and relevant apparatus |
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