CN105871755A - Network resource distributing method and system based on SDN - Google Patents
Network resource distributing method and system based on SDN Download PDFInfo
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- CN105871755A CN105871755A CN201610388675.7A CN201610388675A CN105871755A CN 105871755 A CN105871755 A CN 105871755A CN 201610388675 A CN201610388675 A CN 201610388675A CN 105871755 A CN105871755 A CN 105871755A
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- business stream
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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
- H04L47/70—Admission control; Resource allocation
- H04L47/80—Actions related to the user profile or the type of traffic
- H04L47/805—QOS or priority aware
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
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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
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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
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/625—Queue scheduling characterised by scheduling criteria for service slots or service orders
- H04L47/6275—Queue scheduling characterised by scheduling criteria for service slots or service orders based on priority
Abstract
The invention relates to the technical field of network resource distribution and discloses a network resource distributing method based on an SDN. The method specifically comprises the following steps that at first, whole network state information is obtained, when new service flow comes or the network state changes, the demand characteristics of the service flow are extracted, multi-constraint path calculation is carried out, and the optimal path between a source node and a destination node is obtained; when the current network resource is insufficient, an SDN controller controls redistribution of the network resource, the transmitting path meeting new service flow demands is obtained, and the transmitting path is transmitted to switching equipment of the forwarding face; controlling and forwarding are separated. The invention provides the network resource distributing method and system based on the SDN. By means of the method and the system, the transmitting quality of the later service in the network can be effectively improved, the utilization efficiency of the network resource is improved, and the service quality of high-priority service is improved greatly. The invention further discloses the network resource distributing system based on the SDN.
Description
Technical field
The present invention relates to Internet resources distribution technique field, particularly relate to a kind of network resource allocation method based on SDN and system.
Background technology
Along with the fast development of internet and continuing to bring out of new application, network size the most constantly expands, customer service kind also becomes increasingly abundant, the thing followed is that the demand of the service quality of new business is promoted by user, as more and more higher to the requirement of the performance indications such as the bandwidth of multimedia resource, time delay, shake, packet loss, make people constantly add in stub network equipment by the function that Differentiated Services, OSPF, BGP, traffic engineering, MPLS etc. are complicated, cause the complexity of network structure and be difficult to safeguard.
CN201310363478.6 discloses a kind of common network resource distribution method and system, and described method includes: receive customer service demand access request message, obtains customer service demand type；According to type of service priority parameters set in advance, obtain the priority that described customer service demand type is corresponding；Calculate current public resource load；Corresponding relation between the priority corresponding according to described customer service demand type and current public resource load, it is determined whether distribute common channel resources for described user.Compared with prior art, the present invention, in the case of public resource deficiency, can meet the communication support type of different demand, effective solution meets mobile Internet produced problem when communication support, is finally reached resource and maximally utilizes, maximum revenue, ensure user's perception, improve customer satisfaction.But the method is not bonded on SDN, the demand characteristic of Business Stream is not extracted, and feature and priority the two factor coupling transmit path accordingly according to demand.Therefore, when Internet resources deficiency occurs, recalculating and path traction of service flow path will not actively be carried out.
SDN forwards and makes the function of the network switching equipment become simple with the framework controlling to be separated, it is only necessary to be responsible for forwarding data, and network switching equipment control function originally the most all transfers to the controlled entity on upper strata to complete.Under such framework, manager has only to be programmed just to be managed network, configure and studying in controlled entity.Therefore, SDN not only increases the transmission performance of network, also makes the management of network control to become flexible, expansible simultaneously.
Summary of the invention
Under non-SDN framework, forwarding and control not separate, therefore, all of control function is required for being completed by the network switching equipment.And the control ability of the network switching equipment is limited, causes being difficult to resource distribution, easily occur that Business Stream blocks.For under non-SDN framework, Business Stream holds susceptible to plugging problem, the invention discloses a kind of network resource allocation method based on SDN and system.
The invention discloses a kind of network resource allocation method based on SDN, it specifically includes below step: first obtain the whole network status information, when new Business Stream arrives or network state changes, extract the demand characteristic of Business Stream and carry out multiple-constrained paths calculating, obtaining the optimal path between source node and destination node；When current network resources deficiency, SDN controller controls to carry out redistributing of Internet resources, thus draws the transmission path adapting to new traffic flow requirements, then transmission path is sent the switching equipment to the face of forwarding；Wherein control to be separated with forwarding.The invention provides a kind of network resource allocation method based on SDN and system, can effectively improve business transmission quality in a network later by this method and system, improve the utilization ratio of Internet resources, the service quality of high-priority service is greatly optimized.
Further, redistributing of Internet resources specifically includes below step: list all Business Streams lower than current business flow A priority, the Business Stream that priority is minimum from which starts, simulation stops the rest network resource after its transmission, calculates and the most whether can provide the path meeting demand to Business Stream A；If can provide, then stop this Business Stream；If not being provided that, then the rest network resource after simulation stops the Business Stream that priority time is low simultaneously further, and again calculate path, until there is currently no the Business Stream than Business Stream A more low priority.It is minimum that priority according to Business Stream simulates priority successively, whether minimum+secondary low stopping can enough transmit the mode of current business flow, be given and some Business Stream is increased transmission path, the decision-making to some Business Stream closing transmission path, and be transferred to the switching equipment in forwarding face.This control process completes completely on controlled entity, it is achieved simple, and modification of program is convenient, facilitates the realization of program staff.
Further, relevant field in the message of Business Stream includes service priority and business demand, from business demand, extract this Business Stream sensitive features, carry out multiple-constrained paths calculating according to Business Stream sensitive features, obtain the optimal path between its source node and destination node.Wherein sensitive features type includes: delay sensitive, bandwidth sensitive, packet loss sensitivity, jitter-sensitive etc..
Further, described method is additionally included on the premise of not impacting high-priority service streaming, farthest rebuilds lower-priority traffic.
The invention also discloses a kind of network resource distribution system based on SDN, it specifically includes SDN controller, and described SDN controller specifically controls network sensing module, Internet resources monitoring module, operational analysis module, multiple-constrained paths computing module, resource distribution module and path and issues module；Described network aware module and Internet resources monitoring module are used for obtaining the whole network status information；Described operational analysis module is used for analyzing Business Stream；Described multiple-constrained paths computing module is for obtaining the optimal path between source node and destination node；Described resource distribution module is for carrying out redistributing of Internet resources, thus draws the transmission path adapting to new traffic flow requirements；Described path issues module for transmission path is sent the switching equipment to the face of forwarding；Wherein control to be separated with forwarding.The invention provides a kind of network resource allocation method based on SDN and system, can effectively improve business transmission quality in a network later by this method and system, improve the utilization ratio of Internet resources, the service quality of high-priority service is greatly optimized.
Further, the assigning process of Internet resources distribution module is as follows: list all Business Streams lower than current business flow A priority, the Business Stream that priority is minimum from which starts, simulation stops the rest network resource after its transmission, calculates and the most whether can provide the path meeting demand to Business Stream A；If can provide, then stop this Business Stream；If not being provided that, then the rest network resource after simulation stops the Business Stream that priority time is low simultaneously further, and again calculate path, until there is currently no the Business Stream than Business Stream A more low priority.It is minimum that priority according to Business Stream simulates priority successively, whether minimum+secondary low stopping can enough transmit the mode of current business flow, be given and some Business Stream is increased transmission path, the decision-making to some Business Stream closing transmission path, and be transferred to the switching equipment in forwarding face.This control process completes completely on controlled entity, it is achieved simple, and modification of program is convenient, facilitates the realization of program staff.
Further, relevant field in the message of Business Stream includes service priority and business demand, from business demand, extract this Business Stream sensitive features, carry out multiple-constrained paths calculating according to Business Stream sensitive features, obtain the optimal path between its source node and destination node.Wherein sensitive features type includes: delay sensitive, bandwidth sensitive, packet loss sensitivity, jitter-sensitive etc..
Further, described system also includes that Business Stream rebuilds module, described Business Stream rebuilds module for farthest recovering low priority traffice stream pent in resource distribution module, i.e. according to current network resources situation, the Business Stream closed because of resource-constrained is transmitted the restoration and reconstruction in path.
By using above technical scheme, the invention have the benefit that and provide a kind of network resource allocation method based on SDN and system, business transmission quality in a network later can be effectively improved by this method and system, improve the utilization ratio of Internet resources, the service quality of high-priority service is greatly optimized.The present invention is not only and the method for salary distribution based on priority is attached on SDN, extracts the demand characteristic of Business Stream simultaneously, and feature and priority the two factor coupling transmit path accordingly according to demand.When Internet resources deficiency occurs, actively carry out recalculating and path traction of service flow path.
Accompanying drawing explanation
Fig. 1 is network resource distribution system functional relationship figure.
Fig. 2 is exemplary network topology figure (wherein PC represents that computer, S represent route exchange device).
Fig. 3 is certain Business Stream multiple-constrained paths calculation flow chart.
Fig. 4 is resource re-allocation flow chart.
Fig. 5 is that Business Stream rebuilds flow chart.
Detailed description of the invention
Below in conjunction with Figure of description, describe the detailed description of the invention of the present invention in detail.
Fig. 1 is the network resource distribution system functional relationship figure of the present invention.Its SDN controller controlling side specifically controls network sensing module, Internet resources monitoring module, operational analysis module, multiple-constrained paths computing module, resource distribution module, Business Stream rebuilds module and path issues module.
Network aware module is used for carrying out discovering network topology, including node, link etc., the topology renewal of line period of going forward side by side.Internet resources monitoring module is used for obtaining current network resources, i.e. switching node and the performance of link and current state information.
Operational analysis module resolves the priority of the new Business Stream arrived and all kinds of demand, Business Stream is carried out delay sensitive, bandwidth sensitive, packet loss sensitivity, jitter-sensitive tagsort, and be weighted according to its demand characteristic, feature extraction and the differentiation of Business Stream are treated by final realization, and demand characteristic is informed multiple-constrained paths computing module.Such as: first certain Business Stream requires time delay 200ms, secondly requiring to carry a width of 1Mbps, after SDN controller resolves, i.e. this traffic flow requirements feature precedence is more than idle bandwidth 1Mbps, packet loss and shake no requirement (NR) on time delay maximum tolerance 200ms, transmission path from high to low.Priority according to each sensitive features of Business Stream is different, it is achieved distinguishes and treats.
Multiple-constrained paths computing module calculates corresponding optimal path (as in figure 2 it is shown, such as: Business Stream 1 source is computer A, and purpose is computer B, and its traffic flow requirements is that time delay is not more than 500ms according to the sensitive features of Business Stream.In current network topology, between S2-S3, chain-circuit time delay is 600ms, and remaining chain-circuit time delay is all much smaller than 500ms.According to traffic flow requirements feature, effective topology should not comprise the link between S2-S3, therefore multiple-constrained paths computing module need to delete the link between S2-S3 when carrying out path computing.Concrete calculating process be multiple-constrained paths computing module be adjacency matrix or adjacency list data structure by the currently active topological abstract, obtain the expense shortest path between computer A and computer B in conjunction with respective paths algorithm).In this way, whether multiple-constrained paths computing module calculates the optimal transmission paths meeting this Business Stream feature in network.When cannot meet the path of its demand for traffic flow assignment (when failing to calculate respective paths), resource distribution module checks the Internet resources (starting to check from lowest priority) shared by lower-priority traffic stream, simulation calculates the rest network resource after stopping lower-priority traffic stream, and provides rest network resource recalculates whether can transmit path accordingly to current business flow offer to multiple-constrained paths computing module.If still cannot calculating and transmitting path accordingly, then resource distribution module checks the Internet resources shared by second low-priority traffic stream, and the operation before repeating, until calculate corresponding transmission path or current the most without Business Stream that priority ratio Business Stream to be allocated priority is lower.The calculating process of multiple-constrained paths computing module is as shown in Figure 3, first calculate the set of paths meeting delay requirement, on the basis of meeting the set of paths of delay requirement, calculate the set of paths meeting shake demand, successively, calculating meets bandwidth demand and the set of paths of packet loss demand.Finally, from the set of paths meeting condition, select the path of optimum and be handed down to forward side.
Business Stream is rebuild module and is farthest recovered low priority traffice stream pent in resource distribution module, i.e. according to current network resources situation, the Business Stream closed because of resource-constrained is transmitted the restoration and reconstruction in path, principle is to start to calculate transmission path from the highest priority traffic stream closed when cause is resource-constrained, until lowest priority Business Stream.
Internet resources monitoring module finds to occur in current network congested or time service quality fails to reach traffic flow requirements, can trigger resource distribution module equally and reschedules Business Stream or draw.
Path is issued module and is sent to each switching equipment by OpenFlow interface in the transmission path calculated, and wherein potentially includes and some Business Stream increases transmission path, to some Business Stream closing transmission path.
One of them embodiment
Network resource allocation method based on SDN:
Step S1: by link discovery mechanism, periodically carry out network topology probe, it is thus achieved that the topology informations such as each switching node of current network and link.
Step S2: obtaining on full mesh topology Information base, Internet resources (each switching node, the performance of link and current state information) are carried out periodic harvest and update.After network topology changes, Internet resources are updated immediately.Internet resources specifically include that one, the whole network route exchange device current operation information；Two, the information such as the break-make of total network links, link present flow rate.Internet resources update the renewal referring to periodically update above-mentioned network resource information or after occurring such as events such as link down, and the purpose of renewal is the real time status that SDN controller needs to be grasped current network resources, do data supporting for path computing or path adjustment.When network resource information occurs that such as bandwidth usage reaches 100%, time delay exceedes the situations such as certain predetermined threshold, the operation of step S3 can be triggered equally, carry out redistributing of Internet resources and recalculate with path.
Step S3: when new Business Stream arrives, obtain its service priority and business demand according to the relevant field in this Business Stream message, extract this Business Stream sensitive features from business demand.It is divided into multiple sensitive features type at present: delay sensitive, bandwidth sensitive, packet loss are sensitive, jitter-sensitive.Carry out multiple-constrained paths calculating based on network topological information and network resource information and Business Stream sensitive features, obtain the optimal path between its source node and destination node.
Step S4: if owing to current network resources is not enough, there is not the path meeting traffic flow requirements, then carry out Internet resources and redistribute.The principle that Internet resources are redistributed is: list all Business Streams lower than current business flow A priority, the Business Stream that priority is minimum from which starts, simulation stops the rest network resource after its transmission, calculates and the most whether can provide the path meeting demand to Business Stream A.If can provide, then stop relatively low Business Stream, and perform step S5；If not being provided that, then the rest network resource after simulation stops the Business Stream that priority time is low, and again calculate path, until there is currently no the Business Stream than Business Stream A more low priority.
Step S5: on the premise of high-priority service streaming is not impacted, lower-priority traffic is farthest rebuild, it is ensured that effective utilization of Internet resources.
Step S6: path step S3, step S4, step S5 COMPREHENSIVE CALCULATING gone out is issued to all switching equipment on this path by OpenFlow interface in the way of stream table.
The coefficient gone out given in the above embodiments and parameter; it is available to those skilled in the art realize or use invention; invention does not limit and only takes aforementioned disclosed numerical value; in the case of the thought without departing from invention; above-described embodiment can be made various modifications or adjustment by those skilled in the art; thus the protection domain of invention is not limited by above-described embodiment, and should be the maximum magnitude meeting the inventive features that claims are mentioned.
Claims (7)
1. a network resource allocation method based on SDN, it specifically includes below step: first obtain the whole network status information, when new Business Stream arrives or network state changes, extract the demand characteristic of Business Stream and carry out multiple-constrained paths calculating, obtaining the optimal path between source node and destination node；When current network resources deficiency, SDN controller controls to carry out redistributing of Internet resources, thus draws the transmission path adapting to new traffic flow requirements, then transmission path is sent the switching equipment to the face of forwarding；Wherein control to be separated with forwarding.
2. network resource allocation method based on SDN as claimed in claim 1, it is characterized in that redistributing of described Internet resources specifically includes below step: list all Business Streams lower than current business flow A priority, the Business Stream that priority is minimum from which starts, simulation stops the rest network resource after its transmission, calculates and the most whether can provide the path meeting demand to Business Stream A；If can provide, then stop this Business Stream；If not being provided that, then the rest network resource after simulation stops the Business Stream that priority time is low simultaneously further, and again calculate path, until there is currently no the Business Stream than Business Stream A more low priority.
3. network resource allocation method based on SDN as claimed in claim 2, it is characterized in that the relevant field in the message of Business Stream includes service priority and business demand, this Business Stream sensitive features is extracted from business demand, carry out multiple-constrained paths calculating according to Business Stream sensitive features, obtain the optimal path between its source node and destination node.
4. network resource allocation method based on SDN as claimed in claim 3, it is characterised in that described sensitive features type includes: delay sensitive, bandwidth sensitive, packet loss sensitivity and jitter-sensitive.
5. network resource allocation method based on SDN as claimed in claim 4, it is characterised in that described method is additionally included on the premise of not impacting high-priority service streaming, farthest rebuilds lower-priority traffic.
6. a network resource distribution system based on SDN, it is characterized in that specifically including SDN controller, described SDN controller specifically controls network sensing module, Internet resources monitoring module, operational analysis module, multiple-constrained paths computing module, resource distribution module and path and issues module；Described network aware module and Internet resources monitoring module are used for obtaining the whole network status information；Described operational analysis module is used for analyzing Business Stream；Described multiple-constrained paths computing module is for obtaining the optimal path between source node and destination node；Described resource distribution module is for carrying out redistributing of Internet resources, thus draws the transmission path adapting to new traffic flow requirements；Described path issues module for transmission path is sent the switching equipment to the face of forwarding；Wherein control to be separated with forwarding.
7. network resource distribution system as claimed in claim 6, it is characterized in that the assigning process of described resource distribution module is as follows: list all Business Streams lower than current business flow A priority, the Business Stream that priority is minimum from which starts, simulation stops the rest network resource after its transmission, calculates and the most whether can provide the path meeting demand to Business Stream A；If can provide, then stop this Business Stream；If not being provided that, then the rest network resource after simulation stops the Business Stream that priority time is low simultaneously further, and again calculate path, until there is currently no the Business Stream than Business Stream A more low priority.
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| CN108092909A (en) * | 2016-11-21 | 2018-05-29 | 中国移动通信有限公司研究院 | Data flow control method, apparatus and system |
| CN108696432A (en) * | 2018-05-31 | 2018-10-23 | 广东工业大学 | A kind of SDN wireless Mesh netword method for routing of business flow priority |
| CN110191306A (en) * | 2018-06-06 | 2019-08-30 | 浙江宇视科技有限公司 | A kind of data service transmission optimization method and device based on SDN |
| CN110556032A (en) * | 2019-09-06 | 2019-12-10 | 深圳市艾肯麦客科技有限公司 | 3D model teaching system based on internet |
| CN111885667A (en) * | 2020-07-13 | 2020-11-03 | 中国工商银行股份有限公司 | Network resource allocation method and system |
| CN112600915A (en) * | 2020-12-07 | 2021-04-02 | 北京升哲科技有限公司 | Application method, device, equipment and storage medium of network resources |
| CN113132237A (en) * | 2019-12-30 | 2021-07-16 | 中兴通讯股份有限公司 | Route calculation method and data transmission method |
| CN114448806A (en) * | 2020-10-16 | 2022-05-06 | 广州海格通信集团股份有限公司 | Resource scheduling method and device of software defined network |
| CN115643209A (en) * | 2022-10-24 | 2023-01-24 | 西安电子科技大学 | SDDCN energy-saving routing method, system, equipment and storage medium based on bandwidth matching |
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| CN114448806A (en) * | 2020-10-16 | 2022-05-06 | 广州海格通信集团股份有限公司 | Resource scheduling method and device of software defined network |
| CN114448806B (en) * | 2020-10-16 | 2024-05-03 | 广州海格通信集团股份有限公司 | Resource scheduling method and device of software defined network |
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| CN112600915B (en) * | 2020-12-07 | 2023-02-28 | 北京升哲科技有限公司 | Application method, device, equipment and storage medium of network resources |
| EP4199470A1 (en) * | 2021-12-15 | 2023-06-21 | Abb Schweiz Ag | Orchestrating network usage under the threat of unexpected bandwidth shortages |
| CN115643209A (en) * | 2022-10-24 | 2023-01-24 | 西安电子科技大学 | SDDCN energy-saving routing method, system, equipment and storage medium based on bandwidth matching |
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