CN105072037A - Dynamic flow generating method for distributed SDN controllers - Google Patents
Dynamic flow generating method for distributed SDN controllers Download PDFInfo
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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
- H04L45/54—Organization of routing tables
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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
- H04L45/021—Ensuring consistency of routing table updates, e.g. by using epoch numbers
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Abstract
The invention provides a dynamic flow generating method for distributed SDN controllers, which can effectively reduce flows generated by controllers, increase the bandwidth of managed networks, reduce consumption of switch storage resources and thereby improve the overall network performance. The method comprises the following steps of treating a network area managed by one controller as a network autonomous domain; adopting a shortest path algorithm to generate flows when the flow requests received by the controller are data packets sent to the domain; when the flow requests received by the controller are data packets sent from the domain to the outside, then firstly acquiring the global topology view of all networks managed by the distributed controllers through the controller to generate a global flow; sending down the flow part belonging to the domain in the global flow to switches in the domain and meanwhile sending the rest flows not belonging to the domain to their respective controllers. The respective controllers send the rest flows down.
Description
Technical field
The present invention relates to a kind of dynamic flow table generating method of Based on Distributed SDN controller, belong to field of computer technology.
Background technology
In traditional internet, control centre and retransmission center concentrate in single network equipment, existing network control planes is caused to become day by day complicated, simultaneously, new administrative skill will be applied in network to be needed to be configured one by one conventional network equipment, considerably increase cost, famine flexibility and autgmentability.Therefore the concept of control plane and Forwarding plane being carried out decoupling zero is proposed, as long as two ends all connect according to the specification defined, they just can independently develop forward, no longer by the constraint of the opposing party, the basis of this SDN technology just, its early stage research work comprises 4D framework, RCP, SANE and Ethane etc.Need between control plane and Forwarding plane to connect according to unified specification, this specification is exactly communication protocol.2008, Stanford Univ USA CleanSlate tissue proposed OpenFlow agreement, and this agreement is developed by ONF (open network foundation) at present, is the popular protocol between control plane and Forwarding plane, has issued OpenFlow1.4 version at present.In academia, very active about the academic research of SDN at present, rough estimates are in the top academic conference in the world of the computer networks such as SIGCOMM, NSDI, OSDI, CoNEXT, had more than 20 sections about the scientific paper of SDN, these researchs mainly concentrate on the design of controller, the design of new types of data plane, programming language and interface, test and debugging, application (comprising the application of data center, the application of campus network, the application etc. of network security).
SDN is faced with technically and manyly goes back an open question, the centralized SDN controller wherein merited attention most runs into performance bottleneck, due to the uncertainty of network size, centralized controller can not meet and changed network demand rapidly, as centerized fusion device NOX can support 30K per second request, 1500 station server cluster generation per second 100K request, and the data center of 100 switches is per second may produce 10000K request.Scale 1000 to 2000 equipment of present provider backbone, the data center network scale of 10000 main frames is probably 300 equipment.Therefore, centerized fusion device cannot meet current network demand completely.So along with the increase of network size and the increase of business demand, need the extensibility solution studying control plane, i.e. distributed multi-controller solution.
Along with the expansion of network size and increasing of SDN upper layer application, a large amount of stream list items can be produced in network, greatly reduce network performance.At present, the stream list item quantity in data center is more than 100000 stream tables, and googleWAN has close to 143000; Stanford University's backbone network has 757000; Internet2 has 100000.The stream list item of this magnitude can make the switch of resource-constrained increase a lot of load, and its forwarding performance is declined.And in existing distributed director, shortest path class algorithm is all adopted to generate stream table, the network of distributed AC servo system management is not analyzed, making all to produce comparatively heavy load to network and forwarding unit when generating stream table and storage flow table, reducing whole network performance.
Summary of the invention
1, object:
Main purpose of the present invention is to provide a kind of dynamic flow table generating method of Based on Distributed SDN controller, effectively can reduce the quantity generating stream list item in distributed director, reduce Forwarding plane storage flow gauge pressure, effectively reduce shared network bandwidth when sending stream table, thus reduce controller manage the inquiry time delay of switch, improve transfer capability, make whole network have higher performance.
2, technical scheme:
In order to realize said method, technical scheme of the present invention is such:
The present invention program, when generating stream table, obtains Global Topological figure by distributed SDN controller, regards the region within the scope of a controller instance management as an Autonomous Domain, for the routing rule in territory, generates stream table according to commonsense method; For overseas routing rule, only generate a stream list item between territory and territory, the stream table of packet all according to tape label between territory and territory forwards.
A kind of dynamic flow table generating method of Based on Distributed SDN controller, it is characterized in that, the network area of a controller management is regarded as a network Autonomous Domain, when the stream request that described controller receives is when sending packet in territory, then adopt shortest path class algorithm to generate stream table; If the stream request that described controller receives be by territory to overseas transmission packet time, then first described controller obtains the Global Topological view of the all-network that described distributed director manages, generate global flow table, the stream table belonged in global flow table in this territory is issued in this territory switch, the stream table do not belonged in this territory is sent to the controller belonging to it, is completed issuing function by affiliated controller.
When generating global flow table, the position belonging to switch is different and produce not homogeneous turbulence table rule, and the stream table of generation is as follows:
● No Exit switch in network in territory: add tag label to being sent to overseas packet;
● the egress switch in territory in network: the packet of band tag label is forwarded to go-between;
● the switch in go-between: the packet of band tag label is forwarded to overseas networking;
● the access switch in overseas network: the tag information in the packet of band tag label is removed;
● the non-access switch in overseas network: according to the object information forwarding data bag of packet.
About several explanation of the present invention:
(1) SDN: software defined network (Software-definednetworking), a kind of network virtualization (Networkvirtualization) technology is proposed by Emulex.Utilize OpenFlow agreement, the control plane of router (controlplane) is separated from datum plane (dataplane), realizes with software mode.This framework can allow network manager, under the prerequisite of not changing hardware device, with center control, by program again planning network, for net control flow provides new method, also provides the good platform of core network and application innovation.
(2) network is divided into datum plane and control plane by this novel network architecture of SDN controller: SDN, the forwarding of datum plane primary responsibility data, and control plane is then responsible for working out corresponding forwarding strategy and is carried out guide data plane.As a part of SDN framework, " network operating system (NetworkOperatingSystem, NOS) that control plane is also referred to as sometimes.
(3) stream table: the corresponding Flow of English word, SDN framework middle controller manages switch by sending stream table information to switch, switch utilizes stream table to generate and transmits, and network packet operates packet according to transmitting again.
(4) Autonomous Domain: in the present invention, regards an Autonomous Domain as by the network range of a controller management, comprise a controller, the switch of some, access host after switch in each Autonomous Domain.
3, advantage and effect:
The dynamic flow table generating method of Based on Distributed SDN controller disclosed by the invention, has following major advantage:
(1) the dynamic flow table generating method of Based on Distributed SDN controller is adopted, the scene of distributed SDN controller can be made full use of, stream list item data in effective less whole network, can be optimized the stream table generated according to Global Topological, reach and use minimum stream to express network performance supreme good.In distributed SDN controller scene, a large amount of data packet communications is there is between the network that multiple controller manages, therefore, can each network be regarded as an object, whole network can be reduced to multiple object by communication, routing iinformation various in legacy network can be converted into like this two objects by communication.So just can greatly simplify original routing iinformation, thus when generating stream table, a small amount of stream can be used to express the object of original supervising the network.
(2) supervising the network occupied bandwidth is reduced.In original stream table generation scheme, need the stream list item issuing substantial amounts in supervising the network, as hundreds of thousands level can be reached in data center network, the bandwidth of supervising the network can be taken so in a large number, network delay is increased, reduce the performance of network.And after using this programme to generate stream table, the stream list item in supervising the network can being reduced in a large number, making when issuing stream table, effectively can reduce the network bandwidth sent shared by stream table, effectively improve the bandwidth availability ratio of overall network, improve overall performance of network.
(3) consumption to switch storage resources is reduced.For switch, the storage resources of general switch is more limited, when the stream list item that controller generates is too much, make in each switch, to store a large amount of stream tables, waste the storage resources of switch, also can increase the time of query entries when packet forwards again, reduce forwarding performance; The stream table issued can reduce the consumption of stream table to switch storage resources after reducing, and also improving packet inquiring about time loss when transmitting simultaneously, significantly improving forward efficiency, network performance is improved.
Accompanying drawing explanation
Fig. 1 is the structure chart of single Autonomous Domain;
Fig. 2 is the dynamic flow table generating structure figure of Based on Distributed SDN controller
Fig. 3 is the flow chart that stream table generates;
Embodiment
Expressing for making the object, technical solutions and advantages of the present invention clearly clear, below in conjunction with accompanying drawing and instantiation, the present invention being further described in detail again.
The present invention is the dynamic flow table generating method of Based on Distributed SDN controller, illustrates the structure of an Autonomous Domain in Fig. 1, comprising a controller, and some switches, and connect numerous main frames on switches.Controller manages switch by sending stream table, thus reaches the object of management and dispatch network.The technology that the present invention proposes, when generating as far as possible few stream table, reaches the object of supervising the network, thus improves overall performance of network.
The overall structure figure of first SDN controller in a distributed manner, is described this technical scheme below.Structure chart as shown in Figure 2.In figure, suitable simplification is carried out to the network by distributed AC servo system management, only for 3 Autonomous Domains, explained the detailed process of this programme.As shown in Figure 2, network 1 is source network, is managed by controller 1; Network for the purpose of network 2, is managed by controller 3; And the network that go-between is packet to be sent to object network and need process, managed by controller 2.
A kind of dynamic flow table generating method of Based on Distributed SDN controller is, the network area of a controller management is regarded as a network Autonomous Domain, when the stream request that described controller receives is when sending packet in territory, then shortest path class algorithm is adopted to generate stream table; If the stream request that described controller receives be by territory to overseas transmission packet time, then first described controller obtains by the Global Topological view of the all-network of described distributed AC servo system management, generate global flow table, the stream table belonged in global flow table in this territory is issued in this territory switch, the stream table do not belonged in this territory is sent to the controller belonging to it, is completed issuing function by affiliated controller.
When generating global flow table, the position belonging to switch is different and produce not homogeneous turbulence table rule, and the stream table of generation is as follows:
● No Exit switch in network in territory: add tag label to being sent to overseas packet;
● the egress switch in territory in network: the packet of band tag label is forwarded to go-between;
● the switch in go-between: the packet of band tag label is forwarded to overseas networking;
● the access switch in overseas network: the tag information in the packet of band tag label is removed;
● the non-access switch in overseas network: according to the object information forwarding data bag of packet.
As shown in Figure 2, when controller 1 receives from stream request in its territory, controller 1 generates stream table according to Global Topological, and is issued by the stream table of oneself, and the stream table belonging to other territories is then sent to other controllers, carries out stream table issue by other controllers.For the Autonomous Domain that controller 1 manages, when switch match be sent to the packet of network 2 by network 1 time, exchange opportunity according to stream table rule add a tag label to packet, this label be the overall situation unique, generated by controller; When bag is delivered to go-between by the egress switch of network 1 by packet, have the stream table of corresponding tag in the switch of go-between, packet is forwarded to objective network according to the tag information matched by switch; The access switch of objective network, when matching the packet with this tag, removes the tag label comprised in packet, then shows Packet Generation to destination host according to normal stream.As can be seen from the figure, in go-between, only use stream table just to complete whole network 1 and forward to the packet of network 2, and in existing mechanism each switch need tens even up to a hundred flow list items and just can complete this task.
The present invention makes full use of the feature of distributed SDN controller, the controller calculating stream table can get the Global Topological view of the network that distributed director manages, when generating stream table, regard a network Autonomous Domain as an object, the stream table of generation take Autonomous Domain as elementary cell.For all packets being sent to network 2 from network 1, in Autonomous Domain 1, add label; Forward according to a stream table (in units of switch, on each switch, is flowed table to stream table) in go-between; Label is removed in Autonomous Domain 2.Thus the stream table quantity effectively reduced in go-between.
In the network of distributed SDN controller management, the topological view of oneself institute's supervising the network collected by each controller, and therefore, whole distributed SDN controller just will collect the Global Topological view of all-network.When calculating stream table, controller, according to this topological view, uses algorithm above to calculate the stream table of all nodes, after completing, if the stream table of this Autonomous Domain then oneself issues; If the stream table of other Autonomous Domains, then send stream table to other controllers, completed by other controllers and issue function.
Here is with the dynamic flow table product process figure of a concrete Based on Distributed SDN controller so that the technical program to be described, as shown in Figure 3:
Step S01: the main frame in network 1 sends flowrequest to controller 1, how inquiry by Packet Generation to network 2, could jump to step S02.
Step S02: controller 1 judges whether the object network of the request of flowing is network 2; If so, then jump to step S06, otherwise jump to step S03.
Step S03: judge to flow whether the object network of asking is present networks; If so, then jump to step 04, otherwise jump to S05.
Step S04: according to normal flow, adopts shortest path class algorithm to generate stream table, has so far operated.
Step S05: the object network of stream request is other networks (referring in the network that distributed director manages, the network except controller 1,2,3 manages), generates stream table, so far operated by the flow process of other networks.
Step S06: controller 1 asks Global Topological data to Zookeeper, and obtains the management and control information of each controller, can know that each switch is by which controller management, jumps to step S07.
Step S07: controller 1 utilizes the Global Topological information got, calculated data bag is sent to by network 1 path that network 2 will pass through, and generates global flow table, and the stream table rule of generation is hereafter explained in detail, and jumps to step S08.
Step S08: the stream table belonging to this Autonomous Domain in global flow table is issued to switch by controller 1, jumps to step S09.
Step S09: controller 1 will not belong to the stream table of this Autonomous Domain, be sent to the controller belonging to it, jump to step S10.
Step S10: after other controllers receive the stream table sended over by controller 1 again, is issued to its switch managed, jumps to step S11 by stream table.
Step S11: stream table, after receiving the stream table that controller sends over, is installed in this switch, jumps to step S12 by all switches.
Step S12: switch forwards packet according to stream table rule, has so far operated.
When generating stream table, the position of meeting belonging to switch is different and produce not homogeneous turbulence table rule, and the stream table of generation is as follows:
● No Exit switch in network 1: tag label is added to the packet being sent to network 2.
● the egress switch in network 1: the packet of band tag label is forwarded to go-between.
● the switch in go-between: the packet of band tag label is forwarded to network 2.
● the access switch in network 2: the tag information in the packet of band tag label is removed.
● the non-access switch in network 2: according to the object information forwarding data bag of packet.
Can find out that main thought of the present invention is by above-mentioned, for the scene of distributed SDN controller, a kind of dynamic flow table generation technique is proposed, to reduce the quantity generating stream list item in whole network, simultaneously, also the stream list item reducing substantial amounts, to the consumption of switch storage resources and the network bandwidth, improves the overall performance of network.
The present invention is on software, and to operating system not requirement, because use Java Runtime Environment, this cover software may operate in the environment of any support Java, comprises linux system, Windows system, MacOS etc., and suggestion Java version is 1.8.0.For the switch in network, need to support Openflow agreement, version is 1.3.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (2)
1. a dynamic flow table generating method for Based on Distributed SDN controller, is characterized in that:
The network area of a controller management is regarded as a network Autonomous Domain, when the stream request that described controller receives is when sending packet in territory, then adopt shortest path class algorithm to generate stream table; If the stream request that described controller receives be by territory to overseas transmission packet time, then first described controller obtains the Global Topological view of the all-network that described distributed director manages, generate global flow table, the stream table belonged in global flow table in this territory is issued in this territory switch, the stream table do not belonged in this territory is sent to the controller belonging to it, is completed issuing function by affiliated controller.
2. the dynamic flow table generating method of Based on Distributed SDN controller according to claim 1, is characterized in that: when generating global flow table, and the position belonging to switch is different and produce not homogeneous turbulence table rule, and the stream table of generation is as follows:
● No Exit switch in network in territory: add tag label to being sent to overseas packet;
● the egress switch in territory in network: the packet of band tag label is forwarded to go-between;
● the switch in go-between: the packet of band tag label is forwarded to overseas networking;
● the access switch in overseas network: the tag information in the packet of band tag label is removed;
● the non-access switch in overseas network: according to the object information forwarding data bag of packet.
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