CN101286937B - Network flow control method, device and system - Google Patents

Network flow control method, device and system Download PDF

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Publication number
CN101286937B
CN101286937B CN200810094799XA CN200810094799A CN101286937B CN 101286937 B CN101286937 B CN 101286937B CN 200810094799X A CN200810094799X A CN 200810094799XA CN 200810094799 A CN200810094799 A CN 200810094799A CN 101286937 B CN101286937 B CN 101286937B
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flow
strategy
threshold
control strategy
unit
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CN101286937A (en
Inventor
原毅强
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Huawei Digital Technologies Chengdu Co Ltd
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Huawei Symantec Technologies Co Ltd
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Priority to CN200810094799XA priority Critical patent/CN101286937B/en
Publication of CN101286937A publication Critical patent/CN101286937A/en
Priority to PCT/CN2009/071019 priority patent/WO2009138000A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/10Flow control; Congestion control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/10Flow control; Congestion control
    • H04L47/20Traffic policing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/10Flow control; Congestion control
    • H04L47/29Flow control; Congestion control using a combination of thresholds

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The embodiment of the invention discloses a network flow control method and a corresponding system and a device. The network flow control method comprises the steps that: a strategy center resolves flow information calculated by a DPI device according to the content of a received deep packet to calculate the total network flow, and formulates a corresponding flow control strategy according to the total network flow and sends the corresponding flow control strategy to the DPI device; the DPI device obtains a corresponding flow threshold value of the next predetermined period of time according to the flow control strategy; the DPI device controls the flow when the flow passing through the DPI device exceeds the flow threshold value. By the technical proposal provided by the embodiment of the invention, the strategy control center can formulate different flow control strategies according to the specific flow information calculated by the DPI device, and therefore selective control over service flow can be carried out, which has no effect on the normal service of users.

Description

A kind of method for controlling network flow, Apparatus and system
Technical field
The present invention relates to the Data Interchange Technology field, be specifically related to a kind of method for controlling network flow, Apparatus and system.
Background technology
Along with the expansion of network size and deepening continuously of network application, the flow of transfer of data is also increasing.The computer resource and the information sharing (P2P that reach by the point-to-point direct clearing house between system, Peerto Peer) application of software has also caused blocking up of network, and the user of industries such as operator, enterprise customer and education need limit the flow of application-specific.Existing flow control algorithm all is based on CAR (Committed Access Rate, the agreement access speed) control of value, core router or access device distribute certain CAR value for every link or user, just carry out packet loss and handle when customer flow surpasses the CAR value.
In research and practice process to prior art, the present inventor finds, nonrecognition user's business when the problem of this flow control is that the equipment packet loss is handled can be lost some critical data of user.When network had been subjected to attack, simple dropping packets can make that network is unavailable.This simple control method based on the CAR value can not adapt to the requirement of user to Network Provider service quality.Equipment based on deep packet Context resolution (DPI, Deep Packet Inspection) can not controlled flow by the control method of CAR value, but DPI equipment separate unit disposal ability can't satisfy the demand of existing network, can't carry out the judgement of the overall situation.When DPI device for flow amount is controlled, can not be at special flow, thus influence the flow of user's regular traffic.
Summary of the invention
The embodiment of the invention provides a kind of device of control method, system and policy control of network traffics, can optionally control service traffics.
The embodiment of the invention provides a kind of method for controlling network flow, comprising:
Deep packet Context resolution DPI recognition of devices flow, statistic flow information also reports;
Receive the corresponding flow control strategy, described flow control strategy is for obtaining according to the flow information that reports;
Obtain the flow threshold of next Preset Time section according to described flow control strategy;
When the flow that passes through surpasses described flow threshold, flow is controlled.
A kind of network flow control system comprises:
Deep packet Context resolution DPI equipment, be used to report the flow information of statistics, receive the flow control strategy that issues, obtain the flow threshold of corresponding next Preset Time section according to described flow control strategy, and when the flow by DPI equipment surpasses described flow threshold, flow is controlled;
Strategy Center is used to receive the flow information that described DPI equipment reports, the computing network total flow, and formulate corresponding flow control policy distribution according to described network total flow and arrive described DPI equipment.
The embodiment of the invention also provides a kind of deep packet Context resolution DPI equipment, comprising:
The identification statistic unit is used for identification and statistic flow information;
Transmitting element is used to send the flow information of described identification statistic unit statistics to Strategy Center;
Receiving element is used for receiving the flow control strategy from Strategy Center;
Computing unit is used for the flow control strategy according to described receiving element reception, obtains the flow threshold of corresponding next Preset Time section;
Control unit when being used for flow when described identification statistic unit statistics and surpassing the flow threshold that described computing unit obtains, is controlled flow.
The embodiment of the invention also provides a kind of Strategy Center, comprising:
Reception gathers the unit, is used to receive and gather the flow information that DPI equipment reports;
The policy development unit is used for formulating according to described flow information the flow control strategy of next Preset Time section;
Transmitting element is used to send the flow control strategy of described policy development unit formulation to DPI equipment.
The method for controlling network flow and system, DPI equipment and the Strategy Center that provide by the embodiment of the invention, Strategy Center can carry out the flow control policy development of the overall situation according to the flow information that DPI equipment reports, the flow that surpasses the specified flow threshold of control strategy is controlled, therefore can optionally control by different control strategies, can not impact other regular traffics of user to service traffics.
Description of drawings
Fig. 1 is the signaling process figure of an embodiment of method for controlling network flow of the present invention;
Fig. 2 is the signaling process figure of another embodiment of method for controlling network flow of the present invention;
Fig. 3 is the structure chart of an embodiment of network flow control system of the present invention;
Fig. 4 is the structure chart of an embodiment of DPI equipment of the present invention;
Fig. 5 is the mechanism map of an embodiment of Strategy Center of the present invention.
Embodiment
The embodiment of the invention provides method for controlling network flow and system, DPI equipment and Strategy Center.For making technical scheme of the present invention clearer, below with reference to accompanying drawing and enumerate embodiment, the present invention is described in more detail.
Seeing also Fig. 1, is the signaling process figure of an embodiment of method for controlling network flow of the present invention, realizes that the idiographic flow of flow control comprises:
Step 101:DPI recognition of devices flow is added up various flow informations;
DPI equipment can be a plurality of, and the flow in the backbone network is divided to each DPI equipment, the flow information of each its place branch road of DPI equipment detail statistics.Such as up total flow, descending total flow, up minute protocol traffic, descending minute various flow informations such as protocol traffic, single user uplink total flow and the descending total flow of single user.
With P2P software is example, needs flow, the uplink traffic of single P2P software, the downlink traffic of single P2P software, the descending total flow of P2P of unique user and the various flow informations such as the up total flow of P2P of unique user of all P2P softwares of statistics.
Step 102:DPI equipment reports flow information to Strategy Center;
Set time of DPI equipment interval reports flow information one time in the step 102.
Can adopt IP tunnel when DPI equipment reports flow information to Strategy Center, as long as route can reach communication and just can carry out between DPI equipment and the Strategy Center, guarantee the reliability of communicating by letter like this.
Step 103: Strategy Center gathers the flow information that each DPI equipment reports and obtains the network total flow, if total flow surpasses user's threshold value of setting, then formulates corresponding flow control strategy according to flow information, and will control percentage as parameter;
The ratio of user's threshold value that described control percentage is network total flow and setting.
Step 104: Strategy Center's sending flow rate control strategy is to each DPI equipment;
Step 105:DPI equipment is received the flow control strategy that Strategy Center issues, go out the flow threshold of next Preset Time section according to control percentage calculation wherein, when flow surpasses flow threshold, flow is controlled, added up the flow information of this time period simultaneously;
Described Preset Time section can be set according to user's needs or business characteristic.
Step 103 to the described flow control strategy of step 105 can be one or more, such as wherein one or more of up total flow strategy, descending total flow strategy, up minute protocol strategy, descending minute protocol strategy, single user uplink total flow strategy and the descending total flow strategy of single user.When the flow by DPI equipment surpassed arbitrary flow threshold in the flow control strategy, DPI device for flow amount was controlled; For example: DPI equipment at first is divided into three classes to stream according to the relativity that certain bar flows up byte number and descending byte number, the ratio of up byte number and descending byte number was less than 1: 5 the downstream of thinking, greater than 5: 1 the upstream of thinking, between the equiulbrium flow of thinking between 1: 5 and 5: 1 (comprising 1: 5 and 5: 1); When present flow rate exceeded up threshold value, DPI equipment was controlled upstream; Similarly, if when exceeding descending threshold value, then downstream is controlled; If when the up-downgoing threshold value all exceeds all stream is all controlled.
Can realize different flow control methods by different flow control strategies like this, not influence the purpose of user's regular traffic when reaching the control flow again.
Because each DPI equipment just reports flow information one time every a set time, whether Strategy Center proceeds control according to the flow information decision that reports in the embodiment of the invention; Issue the flow control strategy when needing control, comprise new Control Parameter in the flow control strategy.On each DPI equipment, a flow control strategy is only effective a set time section like this.By the real-time update to the flow control strategy, in the control flow, guaranteed that the network traffics curve chart zigzag variation can not occur like this, user's regular traffic can not be subjected to very big influence yet yet.
Step 106:DPI equipment reports flow information to Strategy Center.
The control of DPI device for flow amount is the control strategy that issues according to Strategy Center, and described control strategy can be multiple; Described DPI equipment can calculate corresponding flow threshold according to every kind of control strategy; When the flow through described DPI equipment surpassed arbitrary flow threshold, DPI equipment all can be controlled at the flow that surpasses flow threshold; And can the flow that does not surpass flow threshold not controlled, guaranteed the use of user's regular traffic.
See also another signaling process figure of Fig. 2, realize that the idiographic flow of flow control comprises for method for controlling network flow embodiment of the present invention:
Step 201:DPI recognition of devices flow is added up various flow informations;
During DPI recognition of devices statistic flow, at various statistical detail statistics flow informations, such as up total flow, descending total flow, up minute protocol traffic, descending minute various flow informations such as protocol traffic, single user uplink total flow and the descending total flow of single user, so that Strategy Center is pointed when formulating the flow control strategy, and do not influence other business of user.
Step 202:DPI equipment reports flow information to Strategy Center;
To report flow information can be that at interval a set time reports once to DPI equipment in the step 202.
Step 203: Strategy Center gathers the flow information that each DPI equipment reports and obtains the network total flow, if total flow surpasses user's threshold value of setting, then formulate corresponding flow control strategy, and the flow threshold that calculates each DPI equipment under the corresponding flow control strategy is as parameter according to flow information;
Described flow control strategy is the value that limits at certain flow.
Step 204: Strategy Center issues the flow control strategy that comprises flow threshold and arrives each DPI equipment;
After step 205:DPI equipment receives the flow control strategy, add up the flow information of next Preset Time section, the stream that surpasses this flow threshold is controlled according to the flow threshold in the flow control strategy;
Step 206:DPI equipment reports the flow information of statistics to Strategy Center.
Each DPI equipment flow threshold is to be calculated by Strategy Center to be issued to each DPI equipment in the foregoing description, and DPI equipment can directly be controlled according to flow threshold.
See also Fig. 3, be the structure chart of embodiment of the invention network flow control system, described network flow control system comprises network shunt 301, DPI equipment 302 and Strategy Center 303.
Described network shunt 301 is used for backbone traffic is distributed to each DPI equipment 302;
Described DPI equipment 302 is used for statistic flow information and is reported to Strategy Center 303, receives the flow control strategy that Strategy Center 303 issues, and control surpasses the stream of flow threshold;
Described DPI equipment can be a plurality of, dispersed and distributed, the flow information of each its place branch road of DPI equipment detail statistics.。
DPI equipment 302 reports flow information every a default set time to policy control center 303.
Described Strategy Center 303 is used to receive the flow information that each DPI equipment 302 reports, and formulates the flow control strategy and is issued to each DPI equipment 302.
Can adopt IP tunnel when DPI equipment reports flow information to Strategy Center, as long as route can reach communication and just can carry out between DPI equipment and the Strategy Center, guarantee the reliability of communicating by letter like this.
Because DPI equipment just reports flow information one time every a set time, whether Strategy Center proceeds control according to the flow information decision that DPI equipment reports in the embodiment of the invention.Issue control strategy when needing to continue control, but the Control Parameter of strategy is different with last time.On each DPI equipment, a control strategy is only effective a set time section like this.By real-time update, in the control flow, guaranteed that also the network traffics curve chart zigzag variation can not occur like this, better experienced for the user control strategy.
See also Fig. 4, be the structure chart of a kind of deep packet parsing of embodiment of the invention DPI equipment, described DPI equipment comprises identification statistic unit 401, transmitting element 402, receiving element 403, computing unit 404 and control unit 405.
Described identification statistic unit 401 is used for identification and statistic flow information;
Described transmitting element 402 is used to send the flow information of described statistic unit statistics to Strategy Center;
Described receiving element 403 is used for receiving the flow control strategy from Strategy Center;
Described computing unit 404 is used for the flow control strategy according to described receiving element reception, obtains the flow threshold of corresponding next Preset Time section.
Described control unit 405 when being used for flow when described statistic unit statistics and surpassing the flow threshold that described computing unit obtains, is controlled flow.
Described computing unit 404 is according to the flow threshold of next the Preset Time section of control percentage calculation that comprises in the flow control strategy, when comprise in the flow control strategy be the flow threshold of next Preset Time section of calculating of Strategy Center the time, computing unit directly obtains this flow threshold.
Can take several different methods when 405 pairs of flows of described control unit are controlled, handle or send the chain rupture of interference bag such as flow being carried out the selectivity packet loss.
The control of DPI device for flow amount is the control strategy that issues according to Strategy Center, and described control strategy can be multiple.Described computing unit 404 can calculate corresponding flow threshold according to every kind of control strategy; When the flow through described DPI equipment surpassed arbitrary flow threshold, control unit 405 all can be controlled at the flow that surpasses flow threshold; And can the flow that does not surpass flow threshold not controlled, guaranteed the use of user's regular traffic.
See also Fig. 5, be the structure chart of embodiment of the invention Strategy Center, described Strategy Center comprises that reception gathers unit 501, policy development unit 502 and transmitting element 503.
Described reception gathers unit 501, is used to receive and gather the flow information that DPI equipment reports;
Described policy development unit 502 is used for formulating according to described flow information the flow control strategy of next Preset Time section;
Described transmitting element 503 is used to send the flow control strategy of described policy development unit formulation to DPI equipment.
Can also add inbound traffics contrasts unit 504 in the described Strategy Center, be used to contrast network total flow and user's threshold value, when network total flow during greater than user's threshold value, notification strategy is formulated the unit and is formulated the flow control strategy.
Like this when the network total flow during greater than user's threshold value Strategy Center just formulate the flow control strategy.
Can be when the flow control strategy is formulated in the policy development unit with control percentage as parameter or next Preset Time section flow threshold as parameter.
Strategy Center formulates control strategy according to detailed flow information, and control strategy can be a kind of also multiple, and DPI equipment carries out flow threshold according to control strategy to the flow by this DPI equipment and sets.
Whether Strategy Center proceeds control according to the flow information decision that reports in the embodiment of the invention; Issue the flow control strategy when needing control, but the Control Parameter of strategy is different with last time.
The method for controlling network flow and system, DPI equipment and the Strategy Center that provide by the embodiment of the invention, the flow information that Strategy Center reports according to DPI equipment carries out the control strategy of the overall situation and formulates, the flow that surpasses control strategy target flow threshold value is controlled, therefore can optionally control by different control strategies, can not impact other regular traffics of user to service traffics.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
More than method for controlling network flow that the embodiment of the invention provided, network flow control system, network traffics control DPI equipment and network traffics control strategy center are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (15)

1. a method for controlling network flow is characterized in that, comprising:
Deep packet Context resolution DPI recognition of devices flow, statistic flow information also reports;
Receive the corresponding flow control strategy, described flow control strategy is for obtaining according to the flow information that reports;
Obtain the flow threshold of next Preset Time section according to described flow control strategy;
When the flow that passes through surpasses described flow threshold, flow is controlled.
2. method for controlling network flow according to claim 1 is characterized in that, described flow control strategy is to be formulated by the network total flow that Strategy Center goes out according to described statistic flow information calculations to issue.
3. method for controlling network flow according to claim 2 is characterized in that, when network total flow during greater than user's threshold value, the threshold value of next Preset Time section is calculated by Strategy Center, comprises the threshold value of described next Preset Time section in the described flow control strategy.
4. method for controlling network flow according to claim 2 is characterized in that, when network total flow during greater than user's threshold value, comprises control percentage parameter in the described flow control strategy, and described control percentage is the ratio of total flow and user's threshold value;
Obtain flow threshold in next Preset Time section by described control percentage calculation.
5. method for controlling network flow according to claim 1 is characterized in that, described statistic flow information is specially:
Flow is discerned, added up the flow information of each agreement.
6. method for controlling network flow according to claim 1 is characterized in that, the described flow threshold that obtains next Preset Time section according to described flow control strategy is specially:
Obtain the flow threshold of next corresponding Preset Time section according to each flow control strategy;
When the flow of process surpasses wherein arbitrary flow threshold, flow is controlled.
7. method for controlling network flow according to claim 1 is characterized in that:
Flow controlled to be specially flow is carried out that the selectivity packet loss is handled or send disturbing the bag chain rupture.
8. a network flow control system is characterized in that, comprising:
Deep packet Context resolution DPI equipment, be used to report the flow information of statistics, receive the flow control strategy that issues, obtain the flow threshold of corresponding next Preset Time section according to described flow control strategy, and when the flow by DPI equipment surpasses described flow threshold, flow is controlled;
Strategy Center is used to receive the flow information that described DPI equipment reports, the computing network total flow, and formulate corresponding flow control policy distribution according to described network total flow and arrive described DPI equipment.
9. a deep packet Context resolution DPI equipment is characterized in that, comprising:
The identification statistic unit is used for identification and statistic flow information;
Transmitting element is used to send the flow information of described identification statistic unit statistics to Strategy Center;
Receiving element is used for receiving the flow control strategy from Strategy Center;
Computing unit is used for the flow control strategy according to described receiving element reception, obtains the flow threshold of corresponding next Preset Time section;
Control unit when being used for flow when described identification statistic unit statistics and surpassing the flow threshold that described computing unit obtains, is controlled flow.
10. DPI equipment according to claim 9 is characterized in that, described computing unit further comprises control percentage calculation unit:
Control percentage calculation unit is used for the flow threshold of next Preset Time section of control percentage calculation of comprising according to the flow control strategy.
11. DPI equipment according to claim 9 is characterized in that, described computing unit further comprises the flow threshold extraction unit:
The flow threshold extraction unit is used for extracting the flow threshold that the flow control strategy comprises.
12. a Strategy Center is characterized in that, comprising:
Reception gathers the unit, is used to receive and gather the flow information that DPI equipment reports;
The policy development unit is used for formulating according to described flow information the flow control strategy of next Preset Time section;
Transmitting element is used to send the flow control strategy of described policy development unit formulation to DPI equipment.
13. Strategy Center according to claim 12 is characterized in that, Strategy Center further comprises:
Flow contrast unit is used to contrast network total flow and user's threshold value, and when network total flow during greater than user's threshold value, notification strategy is formulated the unit and formulated the flow control strategy.
14. Strategy Center according to claim 12 is characterized in that described policy development unit further comprises:
Control percentage calculation unit is used for the flow information calculation control percentage and the transmission that report according to DPI equipment;
The formulation unit is used to receive control percentage and formulation comprises the flow control strategy of controlling percentage.
15. Strategy Center according to claim 12 is characterized in that described policy development unit further comprises:
The flow threshold computing unit is used to calculate the flow threshold of next Preset Time section of DPI equipment and send;
The formulation unit is used to receive control percentage and formulation comprises the flow control strategy of controlling percentage.
CN200810094799XA 2008-05-16 2008-05-16 Network flow control method, device and system Expired - Fee Related CN101286937B (en)

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PCT/CN2009/071019 WO2009138000A1 (en) 2008-05-16 2009-03-26 Method, device and system for controlling network flow

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