CN103685033A - General flow table and method for supporting packet switching and circuit switching in SDN framework - Google Patents
General flow table and method for supporting packet switching and circuit switching in SDN framework Download PDFInfo
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Abstract
The invention provides a general flow table and method for supporting packet switching and circuit switching in an SDN framework, and relates to the SDN framework in the information technology. The general flow table comprises a switching type domain, a circuit switching domain and a packet switching domain. The switching type domain comprises four marks of pure circuit switching, pure packet switching, circuit-packet switching and packet-circuit switching. Service flow is forwarded to a network controller of a control layer through a southbound interface. The network controller is used for judging the type and characteristics of the service flow, computing a forwarding path of the service flow and generating the corresponding general flow table. The network controller issues the general flow table to data forwarding equipment of a data layer through the southbound interface, and establishes corresponding forwarding rules in the data forwarding equipment. The service flow completes packet switching and circuit switching in the data forwarding equipment according to the forwarding rules. The general flow table and method can simultaneously support the packet switching technology and the circuit switching technology, and two existing basis independent networks can be replaced by a data and transmission convergent network efficient in operation.
Description
Technical field
The present invention relates to the SDN framework in information technology, is specifically in a kind of SDN framework, to support packet switching and Circuit-switched general stream table and method.
Background technology
Nowadays, large telecom operators and the Internet manufacturer all have respectively and are safeguarding two distinct basic networks---3/2 layer of IP/Ethernet data network based on packet switching and based on Circuit-switched 1/0 layer of TDM/WDM transport network.Because data network and transport network are two diverse networks, both have different architectures, switching technology, control and management mechanism.In data network, control plane and datum plane are tightly coupled; And transport network keeps the separation between datum plane and control plane traditionally, by two network unifications, be therefore very challenging.
The framework form of common data network and transport network layering isolation, high except making network in general have cost (TCO), also cause data Layer to depend on costliness, high energy consumption, relatively fragile core router even sometimes unduly, transport layer need to provide exceed the quata in a large number configuration " rigid tubing " link in case of need.Obviously, the two does not possess long-range sustainability, lacks the utilization to dynamic extendible circuit-switched technology.In addition, between transport layer and data Layer, unaware, without alternately, also just means that bottom transmits network and there is no visuality for the IP-based business in upper strata and application demand, cannot be by the in real time effective network enabled dynamic Service of automation control plane.Causing current telecom operators to open a new circuit support service all needs to spend several weeks or several months.
Although, in more than ten years in the past there is intelligent control plane technology---the GMPLS Control that packet switching and circuit switching are unified in industry, but it only, just not changing under the prerequisite of existing IP network control framework, is controlled and be take circuit switching as basic transmission network by the distributed route of simple extension and signaling processing protocol (OSPF-TE, RSVP-TE).This distributed control mode is doomed to obtain the unified view of full process and full network, is difficult to realize the whole network centralized control and resource coordinating, and has increased network complexity, has reduced network scalability and reliability and stability.Therefore, have the fusion that change on network control framework could really realize data network and transport network only.
The generation of software defined network SDN technology, for supporting packet switching and Circuit-switched unified control, the fusion that realizes data network and transport network provides effective way.SDN framework allows the fused packet-circuit network of the better control of service provider and operating cost and service optimizes in principle, and selects correct technical combinations to obtain maximum network flexibility according to demand for services.But it,, at the beginning of being born, has only considered the situation of 3/2 layer of IP/Ethernet data network based on packet switching, and ignored the application demand that transmits network and the heterogeneous network based on both combinations based on Circuit-switched 1/0 layer of TDM/WDM.
For south orientation interface protocol OpenFlow in existing software defined network SDN framework, only support the limitation of packet switching, be badly in need of a kind of packet switching and Circuit-switched new method simultaneously supported of invention, to realize SDN technology to data network, transmit the generally applicable of network and heterogeneous network, promote the large fusion of network.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide and in a kind of SDN framework, support packet switching and Circuit-switched general stream table and method, support these two kinds of technology of packet switching and circuit switching simultaneously, with the efficient data of operation and transmission UNE, substitute existing two basic separate networks.
For reaching above object, the invention provides and in a kind of SDN framework, support packet switching and Circuit-switched general stream table, comprise switch type territory, circuit commutative field and packet-switched domain, described switch type territory comprises that pure circuit switching, pure packet switching, circuit turn packet switching and four kinds of signs of grouping shifting circuit exchange; Described circuit commutative field comprises the abstract input list item forming of communication network L0/L1 layer and output list item, and input list item at least comprises input port and virtual port, and output list item at least comprises output port and virtual port; Described packet-switched domain comprises the abstract identifier list item forming of communication network L2/L2.5/L3/L4-L7 layer and operation list item, identifier list item at least comprises the Ethernet frame head, VLAN tag, multiprotocol label, IP packet header of packet data streams and upper-layer protocol field more, and operation list item determines the processing action that the packet data streams of matching identification symbol is taked.
On the basis of such scheme, the list item of described circuit commutative field is by optical fiber, WDM and abstract the forming of TDM circuit interconnection behavior of L0/L1 layer; The list item of packet-switched domain is by Ethernet exchanging, multiprotocol label switching, three layers of exchange, IP route and high-rise abstract forming of data retransmission behavior of processing based on packet header identification of L2/L2.5/L3/L4-L7 layer.
On the basis of such scheme, when WDM exchanges, the input list item of circuit commutative field comprises input port, input wavelength; Output list item comprises output port, output wavelength; Described virtual port is not used.
On the basis of such scheme, when TDM exchanges, the input list item of circuit commutative field comprises input interface, TDM signal type, starts time slot; Output list item comprises output port, TDM signal type, starts time slot; Described virtual port is not used.
On the basis of such scheme, when circuit switching turns packet switching, the virtual port of exporting list item in circuit commutative field is mapped to the operation list item in corresponding packet-switched domain; During the exchange of packet switching shifting circuit, the operation list item in packet-switched domain is mapped to the virtual port of inputting list item in corresponding circuits switching domain.
On the basis of such scheme, the sign in described switch type territory is formed by two combination of bytes, and 00 represents pure circuit switching, and 11 represent pure packet switching, and 01 indication circuit exchange turns packet switching, and 10 represent the exchange of packet switching shifting circuit.
The present invention also provides in a kind of SDN framework based on described general stream table and supports packet switching and Circuit-switched method, SDN framework comprises application layer, key-course and data Layer, key-course comprises network controller, the northbound interface of network controller connects application layer, southbound interface connection data layer, comprise the steps: that the initial new business flow of S1. enters in SDN network, described Business Stream is forwarded to the network controller of key-course by southbound interface; S2. network controller is judged type and the feature of described Business Stream, calculates the forward-path of described Business Stream, and generates corresponding general stream table; S3. network controller issues general stream by southbound interface and shows the data transfer equipment to data Layer, sets up with general stream and show corresponding forwarding rule in data transfer equipment; S4. described Business Stream completes packet switching and circuit switching according to described forwarding rule in data transfer equipment.
On the basis of such scheme, the implementation of described method is, at key-course, a unique group network controller is set, and network controller is controlled data network and transport network by southbound interface unified management, by northbound interface, is connected with the collaborative sublayer in key-course; Collaborative sublayer has the overview of communication network, realizes seamless interactive operation and the optimization of teleservice, and converts the service request of application layer to network request and be handed down to network controller.
On the basis of such scheme, the implementation of described method is, at key-course, two groups of separate network controllers are set, respectively for data network and the transport network of data Layer, described two group network controllers are by East and West direction interface or collaborative sublayer real time interaction information, collaborative sublayer has the overview of communication network, realize seamless interactive operation and the optimization of teleservice, and convert the service request of application layer to network request and be handed down to network controller.
Beneficial effect of the present invention is:
1, the present invention builds general stream and shows by integrating the look-up table of the Circuit-switched cross-connect matrix of L0/L1 and L2/L3/L4 packet switching, and network controller is by the unified forwarding data flow of controlling all types of switching equipment of bottom of general stream table.The control and management of simplification uniform data net and transport network, merges and take packet switching as basic data network and take circuit switching as basic transport network, and the network service demand providing according to them is selected suitable technical combinations.
2, the present invention can allow network operator rely on no longer merely the closed system that possesses same function configuration that equipment vendors provide, with the angle of isolating, consider data network and transport network resource, but cross over the technical limits between packet switching and circuit switching, new extra earning service is provided by every means on the basic network of a fusion, thereby brings the service of innovation faster and differentiation.
3, the present invention in actual applications, can be all equipment form title by the WDM in communication network and data center network, OTN, PTN, IP RAN, P-OTN, IP Router, Ethernet Switch or Multi-layer switch(IP RAN/IP Router/Ethernet Switch, can not in the middle of add pause mark and separate) etc. the multiple equipment form unification based on circuit switching, packet switching or hybrid switching to software defined network SDN framework, realize the full support of southbound interface agreement to packet-type business and Circuit Service.
Accompanying drawing explanation
Fig. 1 is the software defined network SDN layer architecture figure that the present invention applies;
Fig. 2 supports packet switching and Circuit-switched general stream list structure figure in SDN framework of the present invention;
Fig. 3 is that the present invention unifies control packet exchange and Circuit-switched the first implementation schematic diagram;
Fig. 4 is that the present invention unifies control packet exchange and Circuit-switched the second implementation schematic diagram;
Fig. 5 is first embodiment of the invention WDM wavelength circuit switching exemplary plot;
Fig. 6 is second embodiment of the invention TDM time slot circuit switching exemplary plot;
Fig. 7 is the pure packet switching exemplary plot of third embodiment of the invention;
Fig. 8 is the mutual translation example figure of fourth embodiment of the invention circuit switching and packet switching.
Embodiment
As shown in Figure 1, be the software defined network SDN layer architecture figure of the present invention's application, it comprises application layer, key-course and data Layer, is wherein application layer, has contained various Network and application (as application program 1-application program N in figure).The application demand different according to SDN network, application layer is called the north orientation API (abbreviation northbound interface) of joining with key-course, realizes the application of common network service and difference in functionality on the network at after abstract.Key-course is mainly responsible for the abstracted information that deal with data forwards face resource, can network enabled topology, the gathering and safeguard of state information, and different forwarding face resources is called in the control based on application program.The south orientation DLL (dynamic link library) of utilizing key-course and data Layer to join, key-course carries out abstract to data transfer equipment, obtain data retransmission resource information, generates communication network abstract view, and offers upper layer application by northbound interface.Data Layer be responsible for based on general stream table to packet-type and Circuit Service stream process, forwarding and state collect, its data transfer equipment can be ip router, Ethernet switch or the protocol converter etc. based on packet-switch technology, also the equipment such as OTN, the SDH based on circuit-switched technology or WDM, What is more is the pattern of fusion equipment of comprehensive two kinds of switching technologies, the enhancement mode of for example dividing into groups optical transfer network (P-OTN) equipment.
As shown in Figure 2, be to support grouping and Circuit-switched stream table simultaneously, it by the data retransmission behavior of all kinds of switching equipment of data Layer abstract be general list item based on flowing, mainly comprise switch type territory, circuit commutative field and three parts of packet-switched domain.Described switch type territory comprises that pure circuit switching, pure packet switching, circuit turn packet switching and four kinds of signs of grouping shifting circuit exchange; In the present embodiment, indicate and formed by two combination of bytes, 00 represents pure circuit switching, and 11 represent pure packet switching, and 01 indication circuit exchange turns packet switching, and 10 represent the exchange of packet switching shifting circuit.Circuit commutative field is abstracted into input list item and output list item by circuit interconnection behaviors such as the optical fiber of communication network L0/L1 layer, WDM and TDM, with <, inputs; Output > list item (< IN; OUT >) describe, input list item at least comprises input port (Input Port) and virtual port (Virtual Port), and output list item at least comprises output port (Output Port) and virtual port (Virtual Port).Specific to WDM exchange, can be expressed as < input port, input wavelength; Output port, output wavelength > (< Input Port, Input Wavelength; Output Port, Output Wavelength >).TDM exchange can be expressed as < input port, and TDM signal type starts time slot; Output port, TDM signal type, starts time slot > (< Input Port, TDM Signal-type, Starting Time-slot; Output Port, TDM Signal-type, Starting Time-slot >); When visible WDM exchange and TDM exchange, virtual port (Virtual Port) is not all used.Described packet-switched domain is abstracted into identifier list item and operation list item by the Ethernet exchanging of communication network L2/L2.5/L3/L4-L7 layer, multiprotocol label switching, the data retransmission behavior based on packet header identification such as three layers of exchange, IP route and high-rise processing, uses < identifier; Operation > (< IDENTIFIER; ACTION >) list item is described.Identifier list item has been contained the Ethernet frame head (Ethernet frame), VLAN tag (VLAN tags), multiprotocol label (MPLSlabels), IP packet header (IP header) of packet data streams and the L2-L7 layer relevant information such as upper-layer protocol field (L4header) more, operation list item determines the processing action that the packet data streams of matching identification symbol is taked, specifically comprise forwarding, abandon, the behavior such as mirror image, mapping, for example packet switching shifting circuit exchange (Map to virtual-port).
When pure circuit switching and pure packet switching, general stream table abandons respectively packet-switched domain and circuit commutative field with foreshortened length, does not use virtual port (Virtual Port); When circuit turns packet switching, the virtual port of exporting list item in circuit commutative field is mapped to the operation list item in corresponding packet-switched domain; During the exchange of packet switching shifting circuit, the operation list item in packet-switched domain is mapped to the virtual port of inputting list item in corresponding circuits switching domain.
The present invention is based in the SDN framework of above-mentioned general stream table and support packet switching and Circuit-switched method, SDN framework based on shown in Fig. 1, comprise application layer, key-course and data Layer, key-course comprises network controller, the northbound interface of network controller connects application layer, southbound interface connection data layer; Concrete steps are as follows:
S1. initial new business flow enters (as WDM, SDH, OTN, L2 & L3Switch, PTN, IP RAN, P-OTN, CR and other network element device receive circuit or packet-type Business Stream) in SDN network, owing to there is no the stream table for this new flow in data Layer forwarding unit, described Business Stream is forwarded to the network controller of key-course by southbound interface.
S2. network controller is judged type and the feature of described Business Stream, calculates the forward-path of described Business Stream, and generate corresponding general stream table according to upper layer application, network strategy, network topology and Internet resources etc.
S3. network controller issues general stream by southbound interface and shows to all types of data transfer equipment of data Layer, sets up with general stream and show corresponding forwarding rule in data transfer equipment, realizes path forwarding and Resource Allocation in Networks to new service flow.
S4. described Business Stream completes packet switching and circuit switching according to described forwarding rule in data transfer equipment.Wherein, pure circuit switching stream table is: [< 00 > < IN; OUT > < \ >] (< > represents blank); Pure packet switched streaming table: [< 11 > < \ > < IDENTIFIER; ACTION >]; Circuit turns packet switched streaming table: [< 01 > < IN; OUT(Virtual Port) > < IDENTIFIER; ACTION(Virtual Port) >]; Grouping shifting circuit exchange current table is: [< 10 > < IN(Virtual Port); OUT > < IDENTIFIER; ACTION(Virtual Port) >].
As shown in Figure 3, for the present invention unifies control packet exchange and Circuit-switched the first implementation.At network control layer, a unique group network controller Controller is set, it is controlled and be take packet switching as basic data network and take circuit switching as basic transport network by southbound interface unified management, by northbound interface, is connected with collaborative sublayer (Orchestration Sub-layer).Collaborative sublayer has the overview of global network, by coordinating the behavior of heterogeneous networks, realizes seamless interactive operation and the optimization of teleservice, and converts the service request of application layer to network request and be handed down to network controller.
As shown in Figure 4, for the present invention unifies control packet exchange and Circuit-switched the second implementation.At network control layer, for bottom data net and transport network, two groups of separate network controller R-Controller and T-Controller are set respectively.When each layer network is controlled respectively, the controller of two-tier network can pass through East and West direction interface or collaborative sublayer real time interaction information (as routing information, link circuit resource information, network topological information etc.), realizes the seamless fused controlling between multitiered network.
Below by specific embodiment, describe the present invention in detail.
As shown in Figure 5, be first embodiment of the invention WDM exchange exemplary plot.The Circuit-switched general stream table of WDM wavelength is [< 00 > < input port, input wavelength; Output port, output wavelength > < \ >].Suppose that wavelength is that the WDM business of λ 3 is inputted by No. 2 ports of WDM wavelength switching equipment 1, according to upper layer application, network strategy, network topology and Internet resources etc., calculate the forward-path of described Business Stream, and generate corresponding general stream table for [< 00 > < 2, λ 3; 4, λ, 37 > < \ >], wavelength is that the WDM business of λ 37 is from No. 4 port outputs of WDM wavelength switching equipment 1.In like manner calculate general stream table that WDM business generates by WDM wavelength switching equipment 2 for [< 00 > < 4, λ 37; 7, λ, 12 > < \ >]; And then calculate the general stream table that WDM business generates by WDM wavelength switching equipment 3 be [< 00 > < 1, λ 12; 32, λ, 10 > < \ >]; Until the circuit switching of WDM wavelength is complete.
As shown in Figure 6, be second embodiment of the invention TDM time slot circuit switching exemplary plot, the general stream sheet format of its correspondence is: [< 00 > < input port, TDM signal type start time slot; Output port, TDM signal type, starts time slot > < \ >].Signal type is that the TDM business that STS-3c, beginning time slot are 10 is inputted by No. 2 ports of TDM time gas exchange equipment 1, the corresponding general stream table of its generation is [< 00 > < 2 as calculated, STS-3c, 10; 4, STS-3c, 10 > < \ >].Via TDM time gas exchange equipment 2, forward, calculating and generating corresponding general stream table is [< 00 > < 5, STS-3c, 10; 7, STS-3c, 6 > < \ >].Final encapsulation is calculated and generated corresponding general stream table is [< 00 > < 1, STS-3c, 6; 32, STS-3c, 1 > < \ >], final encapsulated signal type is STS-3c, starts in container that time slot is 1, from No. 32 ports outputs of TDM time gas exchange equipment 3.
As shown in Figure 7, for the pure packet switching exemplary plot of third embodiment of the invention, be pure packet switching example, the general stream table of its correspondence is: [< 11 > < \ > < identifiers; Operation >].The source IP address of Web, Video and tri-packet traffic flows of Voice is all 10.44.64.0 to 18, but the Transmission Control Protocol port numbers that the udp protocol port numbers that the Transmission Control Protocol port numbers of Web Business Stream is 80, Video Business Stream is 1234, Voice Business Stream is 5060.Tri-Business Streams of Web, Video and Voice, from PSE 1 input, are stamped respectively three virtual local area network tags vlan30, vlan50 and vlan75 and are distinguished, and using and as identifier, three Business Streams are forwarded for No. vlan.Article three, the general stream table of Business Stream in PSE 1 is followed successively by: [< 11 > < \ > < IP_src=10.44.64.0/18, TCP80; + vlan30, Out P2 >], [< 11 > < \ > < IP_src=10.44.64.0/18, UDP1234; + vlan50, Out P2 >] and [< 11 > < \ > < IP_src=10.44.64.0/18, TCP5060; + vlan50, Out P2 >], in the synthetic Business Stream output of the P2 of PSE 1 port.While forwarding via PSE 2, one of two groups of traffic aggregation of Web and Video, are exported by P3 port, and Voice Business Stream is divided into separately one, by P2 port, is exported, article three, the general stream table of Business Stream is followed successively by: [< 11 > < \ > < vlan30, Out P3 >], [< 11 > < \ > < vlan50, Out P3 >] and [< 11 > < \ > < vlan75, Out P5 >].Finally, tri-Business Streams of Web, Video and Voice are peelled off after virtual local area network tags, by P4, P8 and the P1 port of PSE 3, export respectively, in PSE 3, the general stream table of three Business Streams is followed successively by: [< 11 > < \ > < vlan30;-vlan, Out P4 >], [< 11 > < \ > < vlan50;-vlan, Out P8 >] and [< 11 > < \ > < vlan75;-vlan, Out P5 >], wherein-vlan represents No. vlan.
As shown in Figure 8, be fourth embodiment of the invention circuit switching and the mutual translation example figure of packet switching.Packet switching shifting circuit exchanges general stream table: [< 10 > < inputs (Vport); Output > < identifier; Operation (being mapped to Vport) >]; Circuit switching turns [the < 01 > < input of the general stream table of packet switching; Output (Vport) > < identifier; Operation (reflection is mapped to Vport) >].The source IP address of Web, Video and tri-packet traffic flows of Voice is all 10.44.64.0 to 18, but the Transmission Control Protocol port numbers that the udp protocol port numbers that the Transmission Control Protocol port numbers of Web Business Stream is 80, Video Business Stream is 1234, Voice Business Stream is 5060.Tri-packet traffic flows of Web, Video and Voice are from the input of grouping shifting circuit switching equipment, stamping respectively three virtual local area network tags vlan30, vlan50 and vlan75 is distinguished, and correspondence mappings is converted to Circuit Service stream to virtual port VPort3, VPort7 and VPort9, wherein Video Business Stream is mapped to 3 Circuit Services streams and realizes broadcast; Its general stream table is respectively: [< 10 > < Vport3; 11, VC4,1 > < IP_src=10.44.64.0/18, TCP80; + vlan30, Map to Vport3) >], [< 10 > < Vport7; 22, VC4,7 > < IP_src=10.44.64.0/18, UDP1234; + vlan50, Map to Vport7) >], [< 10 > < Vport7; 24, VC4,4 > < IP_src=10.44.64.0/18, UDP1234; + vlan50, Map to Vport7) >], [< 10 > < Vport7; 30, VC4,10 > < IP_src=10.44.64.0/18, UDP1234; + vlan50, Map to Vport7) >], [< 10 > < Vport9; 33, VC4,1 > < IP_src=10.44.64.0/18, TCP5060; + vlan75, Map to Vport9) >].Via pure circuit switching equipment, forward, its general stream table is: [< 00 > < 2, VC4,1; 1, VC4,6 > < \ >], [< 00 > < 4, VC4,7; 3, VC4,9 > < \ >], [< 00 > < 8, VC4,4; 9, VC4,7 > < \ >], [< 00 > < 6, VC4,10; 5, VC4,4 > < \ >], [< 00 > < 11, VC4,1; 11, VC4,1 > < \ >].Finally, tri-groups of Circuit Service streams of Web, Video and Voice are penetrated back packet-type Business Stream by reflection in circuit switching turns PSE, peel off virtual local area network tags, and by P8, P1/P2/P3, P4 port, export respectively.The general stream table that circuit switching turns packet switching is: [< 01 > < 28, VC4,6; Vport5 > < vlan30; Remap to Vport5 ,-vlan, Out P8) >], [< 01 > < 10, VC4,9; Vport3 > < vlan50; Remapto Vport3 ,-vlan, Out P1) >], [< 01 > < 15, VC4,7; Vport8 > < vlan50; Remap to Vport8 ,-vlan, Out P2) >], [< 01 > < 20, VC4,4; Vport2 > < vlan50; Remap to Vport2 ,-vlan, Out P3) >], [< 01 > < 23, VC4,1; Vport7 > < vlan75; Remap to Vport7 ,-vlan, Out P4) >].
The present invention is not limited to above-mentioned execution mode, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, within these improvements and modifications are also considered as protection scope of the present invention.The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (9)
1. in a SDN framework, support packet switching and Circuit-switched general stream table, it is characterized in that: comprise switch type territory, circuit commutative field and packet-switched domain, described switch type territory comprises that pure circuit switching, pure packet switching, circuit turn packet switching and four kinds of signs of grouping shifting circuit exchange; Described circuit commutative field comprises the abstract input list item forming of communication network L0/L1 layer and output list item, and input list item at least comprises input port and virtual port, and output list item at least comprises output port and virtual port; Described packet-switched domain comprises the abstract identifier list item forming of communication network L2/L2.5/L3/L4-L7 layer and operation list item, identifier list item at least comprises the Ethernet frame head, VLAN tag, multiprotocol label, IP packet header of packet data streams and upper-layer protocol field more, and operation list item determines the processing action that the packet data streams of matching identification symbol is taked.
2. in SDN framework as claimed in claim 1, support packet switching and Circuit-switched general stream table, it is characterized in that: the list item of described circuit commutative field is by optical fiber, WDM and abstract the forming of TDM circuit interconnection behavior of L0/L1 layer; The list item of packet-switched domain is by Ethernet exchanging, multiprotocol label switching, three layers of exchange, IP route and high-rise abstract forming of data retransmission behavior of processing based on packet header identification of L2/L2.5/L3/L4-L7 layer.
3. in SDN framework as claimed in claim 2, support packet switching and Circuit-switched general stream table, it is characterized in that: when WDM exchanges, the input list item of circuit commutative field comprises input port, input wavelength; Output list item comprises output port, output wavelength; Described virtual port is not used.
4. in SDN framework as claimed in claim 2, support packet switching and Circuit-switched general stream table, it is characterized in that: when TDM exchanges, the input list item of circuit commutative field comprises input interface, TDM signal type, starts time slot; Output list item comprises output port, TDM signal type, starts time slot; Described virtual port is not used.
5. in SDN framework as claimed in claim 1, support packet switching and Circuit-switched general stream table, it is characterized in that: when circuit switching turns packet switching, the virtual port of exporting list item in circuit commutative field is mapped to the operation list item in corresponding packet-switched domain; During the exchange of packet switching shifting circuit, the operation list item in packet-switched domain is mapped to the virtual port of inputting list item in corresponding circuits switching domain.
6. in SDN framework as claimed in claim 1, support packet switching and Circuit-switched general stream table, it is characterized in that: the sign in described switch type territory is formed by two combination of bytes, 00 represents pure circuit switching, 11 represent pure packet switching, 01 indication circuit exchange turns packet switching, and 10 represent the exchange of packet switching shifting circuit.
7. in the SDN framework based on general stream table described in claim 1, support packet switching and Circuit-switched method, SDN framework comprises application layer, key-course and data Layer, key-course comprises network controller, the northbound interface of network controller connects application layer, southbound interface connection data layer, it is characterized in that, comprise the steps:
S1. initial new business flow enters in SDN network, and described Business Stream is forwarded to the network controller of key-course by southbound interface;
S2. network controller is judged type and the feature of described Business Stream, calculates the forward-path of described Business Stream, and generates corresponding general stream table;
S3. network controller issues general stream by southbound interface and shows the data transfer equipment to data Layer, sets up with general stream and show corresponding forwarding rule in data transfer equipment;
S4. described Business Stream completes packet switching and circuit switching according to described forwarding rule in data transfer equipment.
8. in SDN framework as claimed in claim 7, support packet switching and Circuit-switched method, it is characterized in that: the implementation of described method is, at key-course, a unique group network controller is set, network controller is controlled data network and transport network by southbound interface unified management, by northbound interface, is connected with the collaborative sublayer in key-course; Collaborative sublayer has the overview of communication network, realizes seamless interactive operation and the optimization of teleservice, and converts the service request of application layer to network request and be handed down to network controller.
9. in SDN framework as claimed in claim 7, support packet switching and Circuit-switched method, it is characterized in that: the implementation of described method is, at key-course, two groups of separate network controllers are set, respectively for data network and the transport network of data Layer, described two group network controllers are by East and West direction interface or collaborative sublayer real time interaction information, collaborative sublayer has the overview of communication network, realize seamless interactive operation and the optimization of teleservice, and convert the service request of application layer to network request and be handed down to network controller.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104320270A (en) * | 2014-10-08 | 2015-01-28 | 武汉邮电科学研究院 | Elastic optical network control system based on SDN architecture and method thereof |
| CN104618475A (en) * | 2015-01-28 | 2015-05-13 | 清华大学 | Horizontal direction communication method for heterogeneous SDN (self-defending network) and SDN system |
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