CN105871745A - Mixed-service-based dispatching method in SDN network - Google Patents

Mixed-service-based dispatching method in SDN network Download PDF

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Publication number
CN105871745A
CN105871745A CN201610373975.8A CN201610373975A CN105871745A CN 105871745 A CN105871745 A CN 105871745A CN 201610373975 A CN201610373975 A CN 201610373975A CN 105871745 A CN105871745 A CN 105871745A
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service
business
sdn
time
real
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CN201610373975.8A
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Inventor
熊琦
郑亮
于治楼
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Inspur Group Co Ltd
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Inspur Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2425—Traffic characterised by specific attributes, e.g. priority or QoS for supporting services specification, e.g. SLA
    • H04L47/2433—Allocation of priorities to traffic types
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2416—Real-time traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/801—Real time traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/805—QOS or priority aware
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/821—Prioritising resource allocation or reservation requests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/829—Topology based

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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 invention discloses a mixed-service-based dispatching method in an SDN network and belongs to resource distribution methods in the SDN network. By means of the method, the problem of resource distribution of service requests having different time delay characteristics in the SDN network is solved. According to the technical scheme, two-stage dispatching is adopted, in upper-layer dispatching, services are divided into real-time services and non-real-time services according to user requests, and according to the time delay threshold values of different service QoS requests, the data volume needing to be transmitted for each service in each time slot is calculated, so that the minimum transmission rate of the data volume is obtained and thus the priority of the services is determined; in lower-layer dispatching, an OpenFlow interchanger obtains the link topology status of the whole SDN network according to the broadband utilization rate of links, and according to the service priority obtained in upper-layer dispatching and the link topology status fed back by the OpenFlow interchanger, an SDN controller dynamically makes the flow table distribution scheme.

Description

Dispatching method based on mixed service in a kind of SDN
Technical field
The present invention relates to resource allocation methods in a kind of SDN, base in specifically a kind of SDN Dispatching method in mixed service.
Background technology
(English full name is SDN: Software Defined Networking, is translated as: software defined network Network), it is a kind of new network innovation framework proposed by clean slate seminar of Stanford Univ USA, Its core technology OpenFlow by network equipment chain of command is separated with data surface, it is achieved thereby that The flexible control of network traffics, the innovation for core network and application provides good platform.Along with SDN Development, network virtualization technology uses centralized control mode, by chain of command and the data of the network equipment Face separates, it is achieved the dynamic distribution of system resource, and resource scheduling management flexibly.SDN is main Comprise SDN controller and OpenFlow switch.SDN controller be mainly responsible for Topology Management, policy development, Stream table issues, and guarantees intelligent network with this.OpenFlow switch is responsible for report chain line state, and root According to the stream table forwarding service packet issued.
Along with the variation of customer service, can (English full name be: Quality of according to the QoS of business Service, is translated as: service quality) require to be classified as non real-time and real-time two classes.In existing money In the dispatching algorithm of source, mainly there are polling algorithm, proportional fair algorithm etc. for non-real-time service, for non-solid Time business mainly have maximum weighted time delay priority algorithm, index proportion fair algorithm etc..And for mixed service Scheduling problem, SDN controller, during formulating stream table, both needs to consider the Link State of exchange network, The most also want the delay requirement of comprehensive all types of user business, how to meet during resource distribution in mixed service different Delay requirement, be the problem that solution is presently required.
Summary of the invention
The technical assignment of the present invention is for above not enough, it is provided that based on mixed service in a kind of SDN Dispatching method, solves in SDN, and the resource distribution of the service request having different delay characteristic is asked Topic.
The technical assignment of the present invention realizes in the following manner, based on mixed service in a kind of SDN Dispatching method, uses two-level scheduler, in upper strata is dispatched, according to user's request, business is divided into real time business With non-real-time service two class, according to the time delay threshold value of different business qos requirement, each in calculating each time slot The data volume of individual service needed transmission, obtains its minimum transmission rate, so that it is determined that service priority；Under In layer scheduling, OpenFlow switch obtains the link in whole SDN according to the broadband utilization rate of link Topology status, the service priority that SDN controller obtains in dispatching according to upper strata, and OpenFlow exchange The link topology state of machine feedback, dynamically formulates stream table allocative decision.
Specifically comprise the following steps that
(1), in SDN, the data buffer storage queue of each user is by the pending service request such as current It is divided into real time business and non-real-time service two class, wherein according to its delay constraint:
(1a), the largest tolerable time delay threshold value of real time business is Tr,max, the maximum of non-real-time service can Tolerant of delay threshold value is Tn,max；
(1b), total bit number of the required transmission of each business be q, real in calculating every time slot according to time delay threshold value Time business needed for minimum transmission rate Rr=q/Tr,max, minimum transmission rate needed for non-real-time service Rn=q/Tn,max；
(1c), calculate the priority of each business, be represented by ω=R/ ∑ (Rr+Rn)；
(2), OpenFlow switch collects service priority information；OpenFlow switch passes through network Traffic sampling obtains the bandwidth availability ratio of each of the links in every time slot, and the link obtained in whole SDN is opened up Flutter state；Service priority information and link topology status information are submitted to by OpenFlow switch in the lump SDN controller, waits the arrival issuing stream table；
(3), SDN controller synthesis service priority, and OpenFlow switch feedback link open up Flutter state, to improve resource utilization ratio as target, formulate forwarding flow table, wherein:
(3a), SDN controller according to the height of service priority, the business that is followed successively by formulates forwarding strategy；
(3b), in order to reduce propagation delay time, formulating stream table when, link in selection transmission path Bandwidth availability ratio is less than upper limit threshold γthScheme；
(4), stream table arrival OpenFlow switch after, OpenFlow switch turns according to issuing stream table Send out corresponding business data packet, wherein:
(4a) according to forwarding flow table, business datum is forwarded a packet at corresponding OpenFlow switch ports themselves； If forwarding unsuccessful, then one error message of feedback is to SDN controller；
(4b) when business datum forwards successfully, by i-th chain in network traffics sampling this time slot of renewal The bandwidth availability ratio γ on roadi, report SDN controller simultaneously.
In step (3a), when SDN controller is business formulation forwarding strategy, certain for real time business distribution Priority, i.e. when overall business data packet is less, properly increase realtime traffic priority.
In a kind of SDN of the present invention, have the advantage that can be with for dispatching method based on mixed service Change in resources dynamically adjusts the mechanism of scheduling strategy, can meet delay requirements different in mixed service, carry High resource utilization ratio, thus, have good value for applications.
Accompanying drawing explanation
The present invention is further described below in conjunction with the accompanying drawings.
Accompanying drawing 1 is the flow chart of dispatching method based on mixed service in a kind of SDN.
Detailed description of the invention
Reference Figure of description and specific embodiment are to based on mixed service in a kind of SDN of the present invention Dispatching method is described in detail below.
Embodiment 1:
Dispatching method based on mixed service in a kind of SDN of the present invention, in a kind of SDN based on The dispatching method of mixed service, uses two-level scheduler, in upper strata is dispatched, business is divided according to user's request For real time business and non-real-time service two class, according to the time delay threshold value of different business qos requirement, calculate every In individual time slot, the data volume of each service needed transmission, obtains its minimum transmission rate, so that it is determined that business is excellent First level；In lower floor dispatches, OpenFlow switch obtains whole SDN according to the broadband utilization rate of link Link topology state in network, the service priority that SDN controller obtains in dispatching according to upper strata, and The link topology state of OpenFlow switch feedback, dynamically formulates stream table allocative decision.
Specifically comprise the following steps that
(1), in SDN, the data buffer storage queue of each user is by the pending service request such as current It is divided into real time business and non-real-time service two class, wherein according to its delay constraint:
(1a), the largest tolerable time delay threshold value of real time business is Tr,max, the maximum of non-real-time service can Tolerant of delay threshold value is Tn,max；
(1b), total bit number of the required transmission of each business be q, real in calculating every time slot according to time delay threshold value Time business needed for minimum transmission rate Rr=q/Tr,max, minimum transmission rate needed for non-real-time service Rn=q/Tn,max；
(1c), calculate the priority of each business, be represented by ω=R/ ∑ (Rr+Rn)；
(2), OpenFlow switch collects service priority information；OpenFlow switch passes through network Traffic sampling obtains the bandwidth availability ratio of each of the links in every time slot, and the link obtained in whole SDN is opened up Flutter state；Service priority information and link topology status information are submitted to by OpenFlow switch in the lump SDN controller, waits the arrival issuing stream table；
(3), SDN controller synthesis service priority, and OpenFlow switch feedback link open up Flutter state, to improve resource utilization ratio as target, formulate forwarding flow table, wherein:
(3a), SDN controller according to the height of service priority, the business that is followed successively by formulates forwarding strategy； For the priority that real time business distribution is certain, i.e. when overall business data packet is less, properly increase reality Time service priority；
(3b), in order to reduce propagation delay time, formulating stream table when, link in selection transmission path Bandwidth availability ratio is less than upper limit threshold γthScheme；
(4), stream table arrival OpenFlow switch after, OpenFlow switch turns according to issuing stream table Send out corresponding business data packet, wherein:
(4a) according to forwarding flow table, business datum is forwarded a packet at corresponding OpenFlow switch ports themselves； If forwarding unsuccessful, then one error message of feedback is to SDN controller；
(4b) when business datum forwards successfully, by i-th chain in network traffics sampling this time slot of renewal The bandwidth availability ratio γ on roadi, report SDN controller simultaneously.
By detailed description of the invention above, described those skilled in the art can readily realize the present invention. It is understood that the present invention is not limited to above-mentioned detailed description of the invention.Base in disclosed embodiment On plinth, described those skilled in the art can the different technical characteristic of combination in any, thus realize different Technical scheme.
In addition to the technical characteristic described in description, it is the known technology of those skilled in the art.

Claims (3)

1. dispatching method based on mixed service in a SDN, it is characterised in that use two-level scheduler, In upper strata is dispatched, according to user's request, business is divided into real time business and non-real-time service two class, according to not With the time delay threshold value of business qos requirement, calculate the data volume of each time slot each service needed interior transmission, Obtain its minimum transmission rate, so that it is determined that service priority；In lower floor dispatches, OpenFlow switch Broadband utilization rate according to link obtains the link topology state in whole SDN, SDN controller according to The service priority obtained in the scheduling of upper strata, and the link topology state of OpenFlow switch feedback, Dynamically formulate stream table allocative decision.
Dispatching method based on mixed service in a kind of SDN the most according to claim 1, its It is characterised by specifically comprising the following steps that
(1), in SDN, the data buffer storage queue of each user is by the pending service request such as current It is divided into real time business and non-real-time service two class, wherein according to its delay constraint:
(1a), the largest tolerable time delay threshold value of real time business is Tr,max, the maximum of non-real-time service can Tolerant of delay threshold value is Tn,max；
(1b), total bit number of the required transmission of each business be q, real in calculating every time slot according to time delay threshold value Time business needed for minimum transmission rate Rr=q/Tr,max, minimum transmission rate needed for non-real-time service Rn=q/Tn,max；
(1c), calculate the priority of each business, be represented by ω=R/ ∑ (Rr+Rn)；
(2), OpenFlow switch collects service priority information；OpenFlow switch passes through network Traffic sampling obtains the bandwidth availability ratio of each of the links in every time slot, and the link obtained in whole SDN is opened up Flutter state；Service priority information and link topology status information are submitted to by OpenFlow switch in the lump SDN controller, waits the arrival issuing stream table；
(3), SDN controller synthesis service priority, and OpenFlow switch feedback link open up Flutter state, formulate forwarding flow table, wherein:
(3a), SDN controller according to the height of service priority, the business that is followed successively by formulates forwarding strategy；
(3b), formulating stream table when, in selection transmission path, the bandwidth availability ratio of link is less than the upper limit Threshold gammathScheme；
(4), stream table arrival OpenFlow switch after, OpenFlow switch turns according to issuing stream table Send out corresponding business data packet, wherein:
(4a) according to forwarding flow table, business datum is forwarded a packet at corresponding OpenFlow switch ports themselves； If forwarding unsuccessful, then one error message of feedback is to SDN controller；
(4b) when business datum forwards successfully, by i-th chain in network traffics sampling this time slot of renewal The bandwidth availability ratio γ on roadi, report SDN controller simultaneously.
Dispatching method based on mixed service in a kind of SDN the most according to claim 2, its It is characterised by step (3a), when SDN controller is business formulation forwarding strategy, distributes for real time business Certain priority, i.e. when overall business data packet is less, properly increases realtime traffic priority.
CN201610373975.8A 2016-05-31 2016-05-31 Mixed-service-based dispatching method in SDN network Pending CN105871745A (en)

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Cited By (10)

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CN106572019A (en) * 2016-11-07 2017-04-19 电子科技大学 Network energy-saving flow scheduling method based on mixing of time delay guaranteeing and SDN
CN106713174A (en) * 2016-12-15 2017-05-24 中国科学院沈阳自动化研究所 Real-time scheduling method and system of industrial control network based on dynamic priority
CN108809857A (en) * 2018-05-23 2018-11-13 中国石油大学(华东) A method of the traffic monitoring based on SDN and service quality securing strategy
CN109274605A (en) * 2017-07-18 2019-01-25 中国科学院声学研究所 A kind of synchronization transfer method suitable for packet switching network
CN109819457A (en) * 2019-01-25 2019-05-28 云南大学 Two-stage thresholding polling system based on FPGA
CN110099407A (en) * 2018-01-30 2019-08-06 华为技术有限公司 A kind of service quality QoS control method and relevant device
CN110719183A (en) * 2018-07-13 2020-01-21 中国科学院沈阳自动化研究所 Real-time software defined industrial network transmission priority dynamic adjustment method and system
CN111095882A (en) * 2017-06-29 2020-05-01 华为技术有限公司 System and method for predicting flows in a network
CN111953600A (en) * 2020-08-24 2020-11-17 国网湖南省电力有限公司 SDN-based energy storage data center service flow scheduling method
CN112491742A (en) * 2020-11-16 2021-03-12 广东电网有限责任公司电力调度控制中心 Method and device for scheduling edge computing terminal resources

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CN106572019A (en) * 2016-11-07 2017-04-19 电子科技大学 Network energy-saving flow scheduling method based on mixing of time delay guaranteeing and SDN
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CN110719183A (en) * 2018-07-13 2020-01-21 中国科学院沈阳自动化研究所 Real-time software defined industrial network transmission priority dynamic adjustment method and system
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CN109819457A (en) * 2019-01-25 2019-05-28 云南大学 Two-stage thresholding polling system based on FPGA
CN111953600A (en) * 2020-08-24 2020-11-17 国网湖南省电力有限公司 SDN-based energy storage data center service flow scheduling method
CN112491742A (en) * 2020-11-16 2021-03-12 广东电网有限责任公司电力调度控制中心 Method and device for scheduling edge computing terminal resources
CN112491742B (en) * 2020-11-16 2022-08-30 广东电网有限责任公司电力调度控制中心 Method and device for scheduling edge computing terminal resources

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Application publication date: 20160817