CN104301249B - A kind of SDN flow table issuances method and apparatus - Google Patents
A kind of SDN flow table issuances method and apparatus Download PDFInfo
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Abstract
The present invention provides a kind of SDN flow table issuances method and apparatus.Methods described includes：The Request Priority of the packet in messages is obtained in the packet in messages sent from SDN equipment, the Request Priority of the packet in messages is packaged as the message priority for the data message that the SDN equipment does not match flow table according to corresponding to the packet in messages；According to the order of Request Priority from high to low, the forward-path of the data message is determined；The flow table for being used to forward the data message on the forward-path for the SDN equipment is issued to the SDN equipment.Pass through technical scheme, it is possible to reduce the Forwarding Delay of the data message of high priority, lift Consumer's Experience.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of SDN flow table issuances method and apparatus.
Background technology
With the continuous development of Internet service, Internet service for the time requirement disposed on the internet increasingly
It is short, for example a service deployment generally requires the time of some months several years ago, but also to spend substantial amounts of manpower.And present one
Individual Internet service may be may require that in the case where putting into a small amount of manpower, and deployment was completed in several days.How rapid deployment one
Individual Internet service, this relates to some new technologies, such as SDN (Software Defined Network, software definition
Network) technology, under the model that SDN is defined, the deployment to business can be realized by way of software, is thrown so as to reduce manpower
Enter, shorten the duration.
SDN changes the framework of existing network, using brand-new design concept, by control plane and data planar separation,
And the control plane of former solidification in the network device is transferred in addressable computing device, it is achieved thereby that to network flow
The flexible control of amount, the innovation for core network and application provide good platform.
The content of the invention
In view of this, the present invention provides a kind of SDN flow table issuances method and apparatus.
Specifically, the present invention is achieved through the following technical solutions：
A kind of SDN flow table issuances method, is applied on SDN controllers, methods described includes：
The Request Priority of the packet-in messages is obtained in the packet-in messages sent from SDN equipment, it is described
The Request Priority of packet-in messages does not match flow table as the SDN equipment according to corresponding to the packet-in messages
The message priority of data message be packaged；
According to the order of Request Priority from high to low, the forward-path of the data message is determined；
Issued to the SDN equipment for the SDN equipment for forwarding the datagram on the forward-path
The flow table of text.
Further, the order according to Request Priority from high to low, the forward-path of the data message is determined
Including：
The buffer queue according to corresponding to the Request Priority by packet-in messages addition；
According to the queue priority order from high to low of the buffer queue, obtain what is cached in the buffer queue
Packet-in messages, and determine the forward-path of data message corresponding to the packet-in messages.
Further, methods described also includes：
Other each SDN equipment on to the forward-path in addition to the SDN equipment issue the use for the SDN equipment
In the flow table that the data message is forwarded on the forward-path.
Further, other each SDN equipment on the forward-path in addition to the SDN equipment, which issue, is directed to
The SDN equipment be used for forward the flow table of the data message to include on the forward-path：
Judge whether the Request Priority of the packet-in messages is not less than threshold value；
If the Request Priority of the packet-in messages is not less than the threshold value, to the forward-path on remove
Other each SDN equipment outside the SDN equipment issue to be used on the forward-path described in forwarding for the SDN equipment
The flow table of data message.
Further, asking for the packet-in messages is obtained in the packet-in messages sent from SDN equipment
Priority is asked to include：
The Request Priority of the packet-in messages is obtained from the dscp field of the packet-in messages.
A kind of SDN flow table issuances device, is applied on SDN controllers, described device includes：
Priority acquiring unit, for obtaining the packet-in reports in the packet-in messages that are sent from SDN equipment
The Request Priority of text, the Request Priority of the packet-in messages are reported by the SDN equipment according to the packet-in
The message priority for the data message for not matching flow table corresponding to text is packaged；
Path determining unit, for the order according to Request Priority from high to low, determine the forwarding of the data message
Path；
First issuance unit, it is used for for being issued to the SDN equipment for the SDN equipment in the forward-path
The flow table of the upper forwarding data message.
Further, the path determining unit, specifically for being reported the packet-in according to the Request Priority
Buffer queue corresponding to text addition；According to the queue priority order from high to low of the buffer queue, the caching is obtained
The packet-in messages cached in queue, and determine the forward-path of data message corresponding to the packet-in messages.
Further, described device also includes：
Second issuance unit, for being issued to other each SDN equipment on the forward-path in addition to the SDN equipment
For the flow table for being used to forward the data message on the forward-path of the SDN equipment.
Further, second issuance unit, specifically for judging that the Request Priority of the packet-in messages is
It is no to be not less than threshold value；In the Request Priority not threshold value described in light rain of the packet-in messages, on the forward-path
Other each SDN equipment in addition to the SDN equipment are issued for the SDN equipment for forwarding institute on the forward-path
State the flow table of data message.
Further, the priority acquiring unit, specifically for being obtained from the dscp field of the packet-in messages
Take the Request Priority of the packet-in messages.
The present invention carries priority letter in the packet-in messages that SDN equipment is sent it can be seen from above description
Breath, so that SDN controllers can preferentially determine the forwarding road of the data message of high priority according to the precedence information
Footpath, so as to reduce the Forwarding Delay of the data message of high priority, lift Consumer's Experience.
Brief description of the drawings
Fig. 1 is SDN networking structures schematic diagram in one embodiment of the present invention.
Fig. 2 is the schematic flow sheet of SDN flow table issuances method in one embodiment of the present invention.
Fig. 3 is the structural representation of SDN flow table issuances device in one embodiment of the present invention.
Embodiment
Include SDN equipment and SDN controllers in typical SDN framework.SDN controllers can pass through proprietary association
View, such as：Open Flow agreements, directly access and manipulate the SDN equipment of Forwarding plane.SDN equipment except existing each other
SDN data channel is used for outside forwarding data packets, also establishes connection by an independent SDN management passage and SDN controllers.
Specifically, there are one or multiple flow tables (Flow Table) in SDN equipment, each list item can be with an action in flow table
Associate to tell SDN equipment how to handle the data message of this list item of hit.SDN equipment handles the number received according to flow table
According to message.If the data message does not find the list item of matching in flow table, SDN equipment gives tacit consent to feelings according to the configuration of flow table
The data message can be reported into SDN controllers by packet-in messages under condition to handle, the data are determined by SDN controllers
The processing mode of message, such as：Its forward-path is confirmed according to the message characteristic of the data message, then passes through packet-out
Message gives flow table issuance corresponding to the forward-path to the SDN equipment.
The problem of such implementation is difficult to avoid that in the presence of some.First, SDN controllers are receiving largely
During packet-in messages, it usually needs cached, then according at the sequencing for receiving packet-in messages
Reason, can not be that the data message of high priority preferentially confirms forward-path, such as：For VOIP (Voice over IP) voice
For communicating data message, time delay is more serious.
Secondly, Fig. 1 is refer to, in the SDN networking schematic diagrams shown in Fig. 1, it is assumed that PC1 will be communicated with PC2, and PC1 is sent
Data message does not find the list item of matching in flow table, then passes through packet-in messages to SDN device As, SDN device As
To be sent on the data message SDN controllers processing, SDN controllers so for the data message generate forward-path, and to
SDN device As issue flow table corresponding to the forward-path.SDN device As give the data message forwarding according to the flow table
SDN equipment B, SDN equipment B repeats the action of SDN device As after the data message is received, will by packet-in messages
SDN controllers are sent on the data message to ask flow table.When huge SDN between PC1 and PC2 be present, due to it
Each SDN equipment on forward-path will be with SDN controller interactions with product process, so the first packet report to communicate between the two
Text has very big time delay, influences Consumer's Experience.Meanwhile occur in the SDN substantial amounts of packet-in messages and
Packet-out messages, easily cause management network congestion.
In view of the above-mentioned problems, the present invention provides a kind of SDN flow table issuances scheme, to reduce the time delay of data message.
Fig. 2 is refer to, the present invention provides a kind of SDN flow table issuances method, applied on SDN controllers, methods described bag
Include following steps：
Step 201, the request that the packet-in messages are obtained in the packet-in messages sent from SDN equipment is preferential
Level, the Request Priority of the packet-in messages as the SDN equipment according to corresponding to the packet-in messages not
The message priority for being fitted on the data message of flow table is packaged.
To realize the present invention, SDN equipment is to be sent to the packet-in messages of SDN controllers to add different requests excellent
First level, so that SDN controllers can preferentially determine forward-path according to the Request Priority for the data message of high priority.
Specifically, if SDN equipment receives the data message for not matching flow table, the data message can be obtained
Message priority, then message priority is encapsulated into packet-in messages, to be used as the packet-in messages
Request Priority.Wherein, the message priority of the data message includes：802.1P priority, DSCP priority, IP precedence
And EXP priority etc., the invention is not limited in this regard.By taking DSCP priority as an example, SDN equipment can obtain the datagram
DSCP (Differentiated Services Code Point, the differentiated services code points) value on literary head, the DSCP values
8 bits are accounted for, DSCP values can be 0 to 63, therefore can represent 64 kinds of Request Priority by DSCP values.In the present invention one
In kind preferred embodiment, the DSCP values can directly be encapsulated into the DSCP words of packet-in headers by SDN equipment
Section.The SDN equipment can also be according to the mapping relations pre-saved by after the DSCP values mapping on the data message head
Value is encapsulated into the dscp field of packet-in headers.Such as：DSCP values 0-7 is mapped as 0, DSCP values 8-15 is mapped
For 1 etc..Certainly, SDN equipment can also be Request Priority corresponding to data message generation according to the feature of data message,
Then the Request Priority is encapsulated into packet-in messages, the invention is not limited in this regard.
In this step, SDN controllers first obtain the packet-in messages after packet-in messages are received
Request Priority, to be previously described as being example, described in SDN controllers can obtain from the dscp field of the packet-in messages
The Request Priority of packet-in messages.
Step 202, the order according to Request Priority from high to low, the forward-path of the data message is determined.
Based on abovementioned steps 201, SDN controllers after the Request Priority of the packet-in messages is got, according to
The order of Request Priority from high in the end, determine not matching the data message of flow table corresponding to the packet-in messages
Forward-path.
Specifically, when actually realizing, in view of SDN controllers may receive substantial amounts of packet-in messages,
Multiple buffer queues can be established on SDN controllers.Such as：It can be incited somebody to action according to the Request Priority of packet-in messages
Packet-in messages add corresponding to buffer queue, then according to the queue priority order from high in the end of buffer queue, obtain
The packet-in messages of caching are taken, and determine not matching turning for the data message of flow table corresponding to the packet-in messages
Send out path.Reported as an example it is assumed that the DSCP values for the data message for not matching flow table are encapsulated into packet-in by SDN equipment
Text dscp field, then SDN controllers can at most receive the different packet-in messages of 64 kinds of Request Priority, if SDN
There are 8 buffer queues on controller, then can establish the corresponding relation of the Request Priority and buffer queue shown in table 1.
| Request Priority | Buffer queue |
| 0-7 | Buffer queue 1 |
| 8-15 | Buffer queue 2 |
| 16-23 | Buffer queue 3 |
| 24-31 | Buffer queue 4 |
| 32-39 | Buffer queue 5 |
| 40-47 | Buffer queue 6 |
| 48-55 | Buffer queue 7 |
| 56-63 | Buffer queue 8 |
Table 1
Table 1 is refer to, should if the Request Priority for the packet-in messages that SDN controllers receive is 62
Packet-in messages are added in buffer queue 8.Assuming that the queue priority of buffer queue 1 is minimum, the priority of buffer queue 2
It is secondary low, the like, the highest priority of buffer queue 8, then SDN controllers elder generation is obtained from buffer queue 8 to caching
Packet-in messages, and be the forward-path for the data message for not matching flow table corresponding to the packet-in messages.Institute
State when packet-in messages are no longer cached with buffer queue 8, the packet-in messages of caching obtained from buffer queue 7,
And handled.
It should be noted that developer when setting the corresponding relation of Request Priority and buffer queue, it is necessary to by height
Request Priority is corresponding with the buffer queue of high queue priority.Such as：Assuming that SDN equipment is direct by the DSCP values of data message
It is encapsulated into the dscp field of packet-in messages, if the DSCP values of the data message represent that the data message is for 1
VOIP voice call data messages, highest priority, then need the packet-in messages that Request Priority is 1 corresponding to team
The buffer queue of row highest priority, such as：Queue 8, so that SDN controllers can be with priority treatment.
Step 203, issued to the SDN equipment for the SDN equipment for forwarding institute on the forward-path
State the flow table of data message.
Based on abovementioned steps 202, SDN controllers do not match the number of flow table determining corresponding to packet-in messages
After the forward-path of message, it is used for reporting the SDN equipment of the packet-in messages to issue for the SDN equipment
The flow table of the data message is forwarded on the forward-path.Still by taking the SDN networkings shown in Fig. 1 as an example, PC1 will communicate with PC2,
When the packet-in messages that SDN controllers are sent according to SDN device As determine that PC1 is sent to the forwarding road of PC2 data message
Behind footpath, flow table is issued by packet-out messages and gives SDN device As.
Further, in this step, SDN controllers on the forward-path except reporting the packet-in messages
SDN equipment outside each SDN equipment issue for the SDN equipment be used for the datagram is forwarded on the forward-path
The flow table of text.Please further refer to Fig. 1, SDN controllers determine PC1 in the packet-in messages sent according to SDN device As
Be sent to PC2 data message forward-path " after SDN device As → SDN equipment B ", to the forward-path on all SDN equipment
(SDN device As and SDN equipment B) issues flow table, so that follow-up SDN equipment B is receiving PC1 and be sent to PC2 first datagram
It can be forwarded after text according to flow table, the data message is asked to SDN controllers without sending packet-in messages
Processing mode, so as to reduce the quantity of packet-in messages and packet-out messages in management network, mitigate management network
Pressure, also mitigate the pressure of SDN controllers.Meanwhile decrease the Forwarding Delay of data message.
Further, for the different data message of priority, SDN controllers can set different flow table issuance plans
Slightly.Such as：For the data message of high priority, to its forward-path on each SDN equipment issue and be used for for the SDN equipment
The flow table of the data message is forwarded on the forward-path, can be only to transmission institute for the data message of low priority
The SDN equipment for stating packet-in messages issues flow table.Specifically, SDN controllers may determine that the packet-in messages
Request Priority, when the Request Priority is not less than default threshold value, to the forward-path on hairpin under each SDN equipment
To the flow table for being used to forward the data message according to the forward-path of the SDN equipment.
It should be noted that the Request Priority of the packet-in messages is not less than described in the expression of default threshold value
The Request Priority of packet-in messages is higher than default priority, the i.e. data message for high priority, and road is forwarded for it
Each SDN equipment issues the flow table for being used to forward the data message on the forward-path for the SDN equipment on footpath.
In practical application, the value that may show as the Request Priority of the packet-in messages is not less than default threshold value, such as：
The priority of data message is higher corresponding to the higher representative of value of Request Priority.Or the packet-in may be shown as
The value of the Request Priority of message is not more than default threshold value, such as：Datagram corresponding to the lower representative of value of Request Priority
The priority of text is higher.Developer can be configured according to actual conditions, the invention is not limited in this regard.
The present invention carries priority letter in the packet-in messages that SDN equipment is sent it can be seen from above description
Breath, so that SDN controllers can preferentially determine the forwarding road of the data message of high priority according to the precedence information
Footpath, so as to reduce the Forwarding Delay of the data message of high priority, lift Consumer's Experience.
The corresponding above method, the present invention also provide a kind of SDN flow table issuances device, and described device is applied in SDN controllers
On.Fig. 3 is refer to, described device 300 includes：Priority acquiring unit 301, path determining unit 302, the first issuance unit
303 and second issuance unit 304.
Wherein, the priority acquiring unit 301, described in being obtained in the packet-in messages that are sent from SDN equipment
The Request Priority of packet-in messages, the Request Priority of the packet-in messages is as the SDN equipment according to
The message priority for not matching the data message of flow table corresponding to packet-in messages is packaged.
The path determining unit 302, for the order according to Request Priority from high to low, determine the data message
Forward-path.
First issuance unit 303, it is used for for being issued to the SDN equipment for the SDN equipment described
The flow table of the data message is forwarded on forward-path.
Further, the path determining unit 302, specifically for according to the Request Priority by the packet-
Buffer queue corresponding to the addition of in messages；According to the queue priority order from high to low of the buffer queue, described in acquisition
The packet-in messages cached in buffer queue, and determine the forwarding road of data message corresponding to the packet-in messages
Footpath.
Further, second issuance unit 304, on the forward-path in addition to the SDN equipment
Other each SDN equipment issue the flow table for being used to forward the data message on the forward-path for the SDN equipment.
Further, second issuance unit 304, specifically for judging that the request of the packet-in messages is preferential
Whether level is not less than threshold value；When the Request Priority of the packet-in messages is not less than the threshold value, to the forwarding road
Other each SDN equipment on footpath in addition to the SDN equipment issue to be used to turn on the forward-path for the SDN equipment
The flow table for sending out data message described.
Further, the priority acquiring unit 301, specifically for the dscp field from the packet-in messages
The middle Request Priority for obtaining the packet-in messages.
The function of unit and the implementation process of effect specifically refer to and step are corresponded in the above method in said apparatus
Implementation process, it will not be repeated here.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the invention with principle.
Claims (10)
1. a kind of software defined network SDN flow table issuance methods, are applied on SDN controllers, it is characterised in that methods described bag
Include：
The Request Priority of the packet-in messages is obtained in the packet-in messages sent from SDN equipment, it is described
The Request Priority of packet-in messages does not match flow table as the SDN equipment according to corresponding to the packet-in messages
The message priority of data message be packaged；
According to the order of Request Priority from high to low, the forward-path of the data message is determined；
Issued to the SDN equipment for the SDN equipment for forwarding the data message on the forward-path
Flow table.
2. according to the method for claim 1, it is characterised in that
The order according to Request Priority from high to low, determining the forward-path of the data message includes：
The buffer queue according to corresponding to the Request Priority by packet-in messages addition；
According to the queue priority order from high to low of the buffer queue, obtain what is cached in the buffer queue
Packet-in messages, and determine the forward-path of data message corresponding to the packet-in messages.
3. according to the method for claim 1, it is characterised in that methods described also includes：
Other each SDN equipment on to the forward-path in addition to the SDN equipment issue to be used for for the SDN equipment
The flow table of the data message is forwarded on the forward-path.
4. according to the method for claim 3, it is characterised in that
Other each SDN equipment on the forward-path in addition to the SDN equipment issue the use for the SDN equipment
In forwarding the flow table of the data message to include on the forward-path：
Judge whether the Request Priority of the packet-in messages is not less than threshold value；
If the Request Priority of the packet-in messages is not less than the threshold value, to the forward-path on except described
Other each SDN equipment outside SDN equipment are issued for the SDN equipment for forwarding the data on the forward-path
The flow table of message.
5. according to the method for claim 1, it is characterised in that
The Request Priority of the packet-in messages is obtained in the packet-in messages sent from SDN equipment to be included：
The Request Priority of the packet-in messages is obtained from the dscp field of the packet-in messages.
6. a kind of SDN flow table issuances device, is applied on SDN controllers, it is characterised in that described device includes：
Priority acquiring unit, for obtaining the packet-in messages in the packet-in messages that are sent from SDN equipment
Request Priority, the Request Priority of the packet-in messages is by the SDN equipment according to the packet-in messages pair
The message priority that answers do not match the data message of flow table is packaged；
Path determining unit, for the order according to Request Priority from high to low, determine the forward-path of the data message；
First issuance unit, it is used to turn on the forward-path for the SDN equipment for issuing to the SDN equipment
The flow table for sending out data message described.
7. device according to claim 6, it is characterised in that
The path determining unit, corresponding to the packet-in messages are added according to the Request Priority
Buffer queue；According to the queue priority order from high to low of the buffer queue, obtain what is cached in the buffer queue
Packet-in messages, and determine the forward-path of data message corresponding to the packet-in messages.
8. device according to claim 6, it is characterised in that described device also includes：
Second issuance unit, it is directed to for being issued to other each SDN equipment on the forward-path in addition to the SDN equipment
The flow table for being used to forward the data message on the forward-path of the SDN equipment.
9. device according to claim 8, it is characterised in that
Second issuance unit, specifically for judging whether the Request Priority of the packet-in messages is not less than threshold value；
When the Request Priority of the packet-in messages is not less than the threshold value, to the forward-path on remove the SDN equipment
Outside other each SDN equipment issue for the SDN equipment be used for the data message is forwarded on the forward-path
Flow table.
10. device according to claim 6, it is characterised in that
The priority acquiring unit, specifically for obtaining the packet- from the dscp field of the packet-in messages
The Request Priority of in messages.
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| CN105871719B (en) * | 2015-01-22 | 2021-01-26 | 中兴通讯股份有限公司 | Method and device for processing routing state and/or policy information |
| CN105721316B (en) * | 2016-02-05 | 2018-11-06 | 北京邮电大学 | A kind of method and device issuing flow table |
| CN106130925A (en) * | 2016-08-26 | 2016-11-16 | 广州西麦科技股份有限公司 | Link scheduling method, equipment and the system of a kind of SDN |
| CN106550159B (en) * | 2017-01-23 | 2019-09-06 | 广州海格通信集团股份有限公司 | VoIP communication system |
| CN106789654A (en) * | 2017-02-07 | 2017-05-31 | 上海斐讯数据通信技术有限公司 | The traffic scheduling method and system of the SP+WRR based on SDN |
| CN107018578B (en) * | 2017-03-27 | 2019-09-20 | 海信集团有限公司 | Data transmission method and device |
| CN107135166B (en) * | 2017-04-07 | 2021-12-31 | 深圳市华迅光通信有限公司 | Flow management system and method |
| CN109729022B (en) * | 2017-10-30 | 2020-07-28 | 华为技术有限公司 | Data sending method, device and system based on software defined network |
| CN115842793B (en) * | 2022-11-16 | 2024-08-30 | 深圳市丰润达科技有限公司 | Route forwarding method, device, equipment and storage medium of three-layer switch |
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