CN104320270A - Elastic optical network control system based on SDN architecture and method thereof - Google Patents
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Abstract
The invention provides an elastic optical network control system based on an SDN architecture and a method thereof, and relates to the technical field of information communication. A multi-streaming optical transceiver at the access edge of an elastic optical network receives a new grouped data stream, generates a corresponding new stream access message and sends the message to a centralized network controller; the centralized network controller generates a stream mapping table and a cross-linked table and distributes the two tables to the multi-streaming optical transceiver and a bandwidth variable waveform cross-linker, respectively, and the multi-streaming optical transceiver configures that a line terminal sends out a corresponding photon data stream according to the stream mapping table; the bandwidth variable waveform cross-linker establishes a photon data stream transmission path according to the cross-linked table and performs spectrum allocation; the photon data stream is unmapped into the grouped data stream according to the stream mapping table in the multi-streaming optical transceiver at the access edge of the elastic optical network, and the grouped data stream is received by a destination terminal router. The elastic optical network control system based on the SDN architecture and the method thereof have the advantages that the complexity of the network control functions is reduced, the resource utilization efficiency is improved and the normalized scheduling of heterogeneous network resources is realized.
Description
Technical field
The present invention relates to technical field of information communication, specifically relate to a kind of elastic optical network control system based on SDN framework and method.
Background technology
In the super 100G epoch, multi-transceiver technology is trend, how to promote the availability of frequency spectrum of multi-transceiver technology, and how to become next step matter of utmost importance developed by the spectrum utilization efficiency of the flexible dispatching lifting optical-fiber network entirety of resource.EON (Elastic Optical Network, elastic optical network) concept arise at the historic moment under this background, it is by defining less bandwidth grid, overcome traditional WDM (Wavelength Division Multiplexing, wavelength division multiplexing) optical-fiber network coarseness, fixed-grid restriction, the distribution bandwidth resources of dynamic flexible, can carry the business demand from sub-wavelength level to hyperchannel level, greatly improve frequency spectrum resource utilization rate; Meanwhile, it can also in sending and receiving end according to transmission range, link-quality, business demand dynamic conditioning transmission rate, modulation format, spectral range with matching network actual demand, improve network flexibility and survivability.From physical layer data plane, elastic optical network comprises MF-OTP (Multi-flow Optical Transponder, multithread optical transceiver) and BV-WXC (Bandwidth Variable Wavelength Cross-connects, adaptive-bandwidth wavelength cross-connect) two parts.
But the connection of physical layer is not equal to business, the completing of business also comprises abundant business provides logic, and this depends on control plane technology.Compared to the technological progress of datum plane, it is the ASON solution of representative that control plane also rests on ASON/GMPLS, its core exchanges automation, lays particular emphasis on and build the control of tearing processing procedure open for connection, comprise the functions such as route, signaling, discovery and Link Resource Manager.The problem that Based Intelligent Control planar technique exists " heavily control, light business ", be applied in elastic optical network, need new strategy and rules such as introducing service-aware, breakdown diagnosis, layer territory is worked in coordination with, resource is virtual, the trend causing ASON/GMPLS control " fat plane " after expanding to change is further obvious, and network control function becomes increasingly complex.Meanwhile, because himself is based on distributed control mechanism, lack the whole network view and the cross-layer visual field concentrated, unified control that cannot realize IP and photosphere, with collaborative, is difficult to the challenge tackling multi-layer multi-domain large-scale network-estabilishing, utilization of resources poor efficiency.
For the problem of elastic optical network datum plane and conventional optical network control plane technology mismatch, be badly in need of the elastic optical network proposed based on SDN framework to control, and the southbound interface OpenFlow agreement of network controller is expanded, the end-to-end path to realizing dynamic and intelligent in elastic optical network provides and unloads with the photosphere of IP operation flow.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of elastic optical network control system based on SDN framework and method, reduce network control function complexity, improve the level of resources utilization, the high-quality of the normalization scheduling and service application that realize heterogeneous network resource ensures.
For reaching above object, the present invention takes a kind of elastic optical network control system based on SDN framework, comprise the on-line file controller of control plane, at least two multithread optical transceivers of data plane and at least one adaptive-bandwidth wavelength cross-connect, by the OpenFlow protocol communication of expansion between two aspects, it is characterized in that: described multithread optical transceiver is provided with stream mapping table, for recording the mapping relations between client packets data flow and line scan pickup coil side photon data stream, described adaptive-bandwidth wavelength cross-connect is provided with cross-connect matrix, for the input/output end port of photon data stream in record circuit, take the introductory path information of spectral range, described stream mapping table and cross-connect matrix pass through the unified management of southbound interface agreement by on-line file controller.
On the basis of technique scheme, in described multithread optical transceiver and adaptive-bandwidth wavelength cross-connect, OpenFlow agent function module is all set, the OpenFlow agent function module of multithread optical transceiver is for safeguarding stream mapping table, and the OpenFlow agent function module of adaptive-bandwidth wavelength cross-connect is for safeguarding cross-connect matrix.
On the basis of technique scheme, the multithread optical transceiver that elastic optical network networking edge is connected with router, be used for identifying the client packets data flow from router interface, utilize the information entrained by packet header to classify, and be line scan pickup coil side photon data stream according to classification results by described convert information.
On the basis of technique scheme, described adaptive-bandwidth wavelength cross-connect is by route-selection type structure, and after carrying out frequency spectrum cutting to the photon data stream in circuit, routing exchanges, and supports the road up and down of local photon data stream simultaneously.
On the basis of technique scheme, described stream mapping table comprises matching domain, domain of instruction, flow rate, centre frequency, spectrum width and modulation format six list items, wherein matching domain contains packet header information field, comprises source address, destination address, VLAN label.
On the basis of technique scheme, the identification of described packet header information field and classified packets data flow, domain of instruction decides mapping between packet data streams with corresponding photon data stream and anti-map operation, and flow rate, centre frequency, spectrum width and modulation format portray the technical characteristic of line scan pickup coil side photon data stream.
On the basis of technique scheme, described cross-connect matrix comprises input list item and exports list item, input list item comprises input slogan, input centre frequency, input spectrum width and input modulation format four list items, exports list item and comprises output slogan, output center frequency, output spectrum width and export modulation format four list items.
On the basis of technique scheme, the corresponding photonic data of port numbers when the corresponding photon data stream of input slogan is set out on a journey, output slogan flows down port numbers during road, or input slogan and the interconnection of output slogan two list items corresponding photon data stream wavelength.
The present invention also provides a kind of elastic optical network control method based on SDN framework, comprise step: the multithread optical transceiver that S1. elastic optical network networking edge is connected with router receives the new packet data streams that a client inputs, extract its packet header information, and calculate flow rate, generate and newly flow into network information accordingly, send to on-line file controller; S2. on-line file controller receives and newly flows into network information, after being calculated by route spectrum allocation algorithm, generate stream mapping table and cross-connect matrix, then be issued to corresponding multithread optical transceiver and adaptive-bandwidth wavelength cross-connect respectively by the OpenFlow agreement of expansion; S3. the multithread optical transceiver that is connected with router of elastic optical network networking edge, the stream mapping table layout line terminal according to issuing sends corresponding photon data stream; All adaptive-bandwidth wavelength cross-connects set up photon data stream transmission path and spectrum allocation may according to cross-connect matrix; S4. photon data stream goes out in network edge place multithread optical transceiver in elastic optical network, penetrates packet data streams, received by destination router according to the reflection of stream mapping table.
On the basis of technique scheme, spectrum allocation algorithm comprehensively newly flows into flow information and the whole network occupation condition of network information, calculate the technical parameter of corresponding photon data stream, comprise arrangement path, spectrum allocation may and modulation format, generate stream mapping table and cross-connect matrix according to technical parameter.
Beneficial effect of the present invention is: adopt open flexible centralized control system by the elastic optical network of SDN framework, and by expanding the method for southbound interface OpenFlow agreement, open management and service adaptation interface are provided, simplify multi-layer multi-domain networking controlling functions, improve overall network spectrum utilization efficiency, achieve and the dynamic flexible of network bottom layer resource is dispatched and carried the intelligent and high-efficiency of network diverse services.Meanwhile, the whole network view that its centrality and opening possess and the cross-layer visual field, also merge for network layer territory is collaborative and resource virtualizing provides possibility.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the elastic optical network control system that the present invention is based on SDN framework;
Fig. 2 is the list item block diagram of stream mapping table;
Fig. 3 is the list item block diagram of cross-connect matrix;
Fig. 4 is the elastic optical network control method flow chart based on SDN framework;
Fig. 5 is embodiment of the present invention elastic optical network control system exemplary plot.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, the present invention is based on the elastic optical network control system of SDN framework, comprise the on-line file controller (Controller) of control plane, data plane possesses multithread optical transceiver (OF-MF-OTP) and the adaptive-bandwidth wavelength cross-connect (OF-BV-WXC) of OpenFlow agent functionality, by the OpenFlow protocol communication of expansion between two aspects, wherein multithread optical transceiver at least two, adaptive-bandwidth wavelength cross-connect is at least one, multithread optical transceiver at least one be positioned at elastic optical network networking edge and be connected with router, at least one is positioned at elastic optical network and goes out network edge and be connected with destination router.In multithread optical transceiver and adaptive-bandwidth wavelength cross-connect, OpenFlow agent function module is all set.Be positioned at elastic optical network networking edge to be connected with router multithread optical transceiver, be used for identifying the client packets data flow from router interface, utilize the information such as the destination address entrained by packet header, VLAN label to classify, and be multiple different spectral scope, different modulating speed, different transmission range line scan pickup coil side photon data stream according to classification results by described convert information.Adaptive-bandwidth wavelength cross-connect is by " route-selection " type structure, and after carrying out frequency spectrum cutting as required to the photon data stream in circuit, routing exchanges, and supports the road up and down of local photon data stream simultaneously.
OpenFlow agent function module internal maintenance one stream mapping table (the Flow Mapping Table of multithread optical transceiver, FMT), for recording the mapping relations between client packets data flow and part of path photon data stream, as packet data streams is mapped as photon data stream, photon data stream is counter is mapped as packet data streams; And the information such as the bit rate of recording light sub data flow, centre frequency, spectrum width, modulation format, this table unifies maintenance management by on-line file controller by southbound interface agreement.OpenFlow agent function module internal maintenance cross-connect matrix (Cross Connection Table of adaptive-bandwidth wavelength cross-connect, CCT), for photon data stream in record circuit input/output end port, take the introductory path information such as spectral range, this table also unifies maintenance management by on-line file controller by southbound interface agreement, and photon data stream carries out frequency spectrum cutting according to the content in this table.
As shown in Figure 2, described stream mapping table comprises matching domain (Match Fields), domain of instruction (Instructions), flow rate (Flow Rate), centre frequency (Central Frequency), spectrum width (Slot Width) and modulation format (Modulation Format) six list items; Wherein matching domain is containing packet header information fields such as source address, destination address, VLAN labels, for identification and the classification of packet data streams; Domain of instruction decides mapping between packet data streams with corresponding photon data stream and anti-map operation; Wherein flow rate, centre frequency, spectrum width and modulation format feature the technical characteristic of line scan pickup coil side photon data stream.
As shown in Figure 3, cross-connect matrix comprises input list item and exports list item, and input list item comprises input slogan (Input Port), input centre frequency (Input Central Frequency), input spectrum width (Input Slot Width) and input modulation format (Input Modulation Format) four list items; Export list item comprise output slogan (Output Port), output center frequency (Output Central Frequency), output spectrum width (Output Slot Width) and export modulation format (Output Modulation Format) four list items.Input slogan and the interconnection of output slogan two list items corresponding photon data stream wavelength, or port numbers when the corresponding photon data stream of input slogan is set out on a journey, port numbers when the corresponding photonic data of output slogan flows down road.I/O centre frequency and I/O spectrum width decide the scope of cutting and translation from input to output frequency spectrum; The coded system conversion of modulation format entry record photon data stream.
As shown in Figure 4, the present invention is based on the elastic optical network control method of SDN framework, comprise step:
S1. the multithread optical transceiver that elastic optical network networking edge is connected with router receives the new packet data streams (such as IP operation) that a client inputs, due to the list item not for this flow in data plane forwarding unit, so multithread optical transceiver extracts the packet header information of new packet data streams, and calculate flow bit rate (being equal to flow rate), generate and newly flow into network information (Flow In message) accordingly, send to on-line file controller.
S2. on-line file controller receives and newly flows into network information, start inner route spectrum allocation algorithm (Routing and Spectrum Assignment, RSA), comprehensive new flow information and the whole network occupation condition flowing into network information in algorithm, calculate the technical parameters such as the arrangement path of corresponding photon data stream, spectrum allocation may and modulation format selection, generate stream mapping table and cross-connect matrix according to technical parameter.Again by the OpenFlow agreement of expansion, two tables are issued to data plane forwarding unit, that is, stream mapping table are issued to corresponding multithread optical transceiver, cross-connect matrix are issued to corresponding adaptive-bandwidth wavelength cross-connect.
S3. the multithread optical transceiver of elastic optical network networking edge is according to the stream mapping table issued, and layout line terminal sends the photon data stream of corresponding modulation rate, spectral range and coded system; Adaptive-bandwidth wavelength cross-connect, according to cross-connect matrix, sets up photon data stream transmission path and spectrum allocation may.
S4. photon data stream goes out in the multithread optical transceiver of network edge in elastic optical network, packet data streams (photon data stream is converted to packet data streams) is penetrated according to the reflection of stream mapping table, and received by destination router, thus the dynamic and intelligent end-to-end path realizing Network provides.
Below in conjunction with specific embodiment, the present invention is elaborated.
As shown in Figure 5, the multithread optical transceiver OF-MF-OTP1 that elastic optical network networking edge is connected with router Router1 receives a new packet video data flow, in information entrained by the A of its packet header, source IP address is 10.44.64.0 to 18, udp protocol port numbers is 1234, VLAN label is 50.This video data stream needs the router Router2 being sent to the other end via elastic optical network to receive.Due to the list item not for this flow in data Layer forwarding unit, so multithread optical transceiver extracts its packet header relevant information (source IP address, udp protocol port numbers and VLAN label), measuring and calculating video flow bit rate (2 × 100GE), and the corresponding new network information Flow In message that flows into of generation sends to on-line file controller.After on-line file controller receives this message, start inner route spectrum allocation algorithm, this flow information comprehensive and the whole network occupation condition, calculate the technical parameters such as the arrangement path after being converted into photon data stream, spectrum allocation may and modulation format, and generate for the stream mapping table of multithread optical transceiver and the cross-connect matrix for configured bandwidth variable wavelength cross-connect further, be issued in data Layer forwarding unit by the southbound interface OpenFlow agreement of expansion.
The stream mapping table FMT1 that the multithread optical transceiver OF-MF-OTP1 of data Layer issues according to on-line file controller, be (100Gbps × 2) by packet video data stream to bit rate, centre frequency is (193.1THz+1 × 0.00625THz), spectrum width is (12.5GHz × 4), and modulation format is the middle distance transmission light sub data flow of (DP-16QAM) and is sent to the adaptive-bandwidth wavelength cross-connect of down hop.The cross-connect matrix CCT1 that adaptive-bandwidth wavelength cross-connect OF-BV-WXC1 then utilizes network controller to issue arranges suitable photon data stream access path (P2 to P7), modulation format (middle distance transmission DP-16QAM is converted to long range propagation DP-QPSK) and spectral range (CF=193.1THz+1 × 0.00625THz, SW=12.5GHz × 4 move to CF=193.1THz+27 × 0.00625THz, SW=12.5GHz × 5).
In like manner, the cross-connect matrix CCT2 that adaptive-bandwidth wavelength cross-connect OF-BV-WXC2 also utilizes network controller to issue arranges appropriate photon data stream access path (P5 to P9), modulation format (long range propagation DP-QPSK is converted to middle distance transmission DP-16QAM) and spectral range (CF=193.1THz+27 × 0.00625THz, SW=12.5GHz × 5 move to CF=193.1THz+9 × 0.00625THz, SW=12.5GHz × 4).Cross-connect matrix CCT1 and cross-connect matrix CCT2 issues simultaneously, be all Centralized Controller be the interconnection list item that same packet video data flow calculates, separate, be distributed to different adaptive-bandwidth wavelength cross-connects, cross-connect matrix CCT1 is distributed to adaptive-bandwidth wavelength cross-connect OF-BV-WXC1, and cross-connect matrix CCT2 is distributed to adaptive-bandwidth wavelength cross-connect OF-BV-WXC2.
Photon data stream goes out in the multithread optical transceiver OF-MF-OTP2 at network edge place in elastic optical network, and original packet video data flow is penetrated back in the stream mapping table FMT2 reflection issued according to on-line file controller, and is received by destination router Router2.So far, achieve the dynamic and intelligent end-to-end path of packet video Business Stream is connected.
The present invention is not limited to above-mentioned execution mode, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. the elastic optical network control system based on SDN framework, comprise the on-line file controller of control plane, at least two multithread optical transceivers of data plane and at least one adaptive-bandwidth wavelength cross-connect, by the OpenFlow protocol communication of expansion between two aspects, it is characterized in that: described multithread optical transceiver is provided with stream mapping table, for recording the mapping relations between client packets data flow and line scan pickup coil side photon data stream, described adaptive-bandwidth wavelength cross-connect is provided with cross-connect matrix, for the input/output end port of photon data stream in record circuit, take the introductory path information of spectral range, described stream mapping table and cross-connect matrix pass through the unified management of southbound interface agreement by on-line file controller.
2. as claimed in claim 1 based on the elastic optical network control system of SDN framework, it is characterized in that: in described multithread optical transceiver and adaptive-bandwidth wavelength cross-connect, OpenFlow agent function module is all set, the OpenFlow agent function module of multithread optical transceiver is for safeguarding stream mapping table, and the OpenFlow agent function module of adaptive-bandwidth wavelength cross-connect is for safeguarding cross-connect matrix.
3. as claimed in claim 1 based on the elastic optical network control system of SDN framework, it is characterized in that: the multithread optical transceiver that elastic optical network networking edge is connected with router, be used for identifying the client packets data flow from router interface, utilize the information entrained by packet header to classify, and be line scan pickup coil side photon data stream according to classification results by described convert information.
4. as claimed in claim 1 based on the elastic optical network control system of SDN framework, it is characterized in that: described adaptive-bandwidth wavelength cross-connect is by route-selection type structure, after carrying out frequency spectrum cutting to the photon data stream in circuit, routing exchanges, and supports the road up and down of local photon data stream simultaneously.
5. as claimed in claim 1 based on the elastic optical network control system of SDN framework, it is characterized in that: described stream mapping table comprises matching domain, domain of instruction, flow rate, centre frequency, spectrum width and modulation format six list items, and wherein matching domain contains packet header information field.
6. as claimed in claim 5 based on the elastic optical network control system of SDN framework, it is characterized in that: the identification of described packet header information field and classified packets data flow, domain of instruction decides mapping between packet data streams with corresponding photon data stream and anti-map operation, and flow rate, centre frequency, spectrum width and modulation format portray the technical characteristic of line scan pickup coil side photon data stream.
7. as claimed in claim 1 based on the elastic optical network control system of SDN framework, it is characterized in that: described cross-connect matrix comprises input list item and exports list item, input list item comprises input slogan, input centre frequency, input spectrum width and input modulation format four list items, exports list item and comprises output slogan, output center frequency, output spectrum width and export modulation format four list items.
8. as claimed in claim 7 based on the elastic optical network control system of SDN framework, it is characterized in that: the corresponding photonic data of port numbers when the corresponding photon data stream of input slogan is set out on a journey, output slogan flows down port numbers during road, or input slogan and the interconnection of output slogan two list items corresponding photon data stream wavelength.
9. the elastic optical network control method based on SDN framework of system as claimed in claim 1, is characterized in that, comprise step:
S1. the multithread optical transceiver that elastic optical network networking edge is connected with router receives the new packet data streams that a client inputs, extract its packet header information, and calculate flow rate, generate and newly flow into network information accordingly, send to on-line file controller;
S2. on-line file controller receives and newly flows into network information, after being calculated by route spectrum allocation algorithm, generate stream mapping table and cross-connect matrix, then be issued to corresponding multithread optical transceiver and adaptive-bandwidth wavelength cross-connect respectively by the OpenFlow agreement of expansion;
S3. the multithread optical transceiver that is connected with router of elastic optical network networking edge, the stream mapping table layout line terminal according to issuing sends corresponding photon data stream; All adaptive-bandwidth wavelength cross-connects set up photon data stream transmission path and spectrum allocation may according to cross-connect matrix;
S4. photon data stream goes out in network edge place multithread optical transceiver in elastic optical network, penetrates packet data streams, received by destination router according to the reflection of stream mapping table.
10. as claimed in claim 9 based on the elastic optical network control method of SDN framework, it is characterized in that: spectrum allocation algorithm comprehensively newly flows into flow information and the whole network occupation condition of network information, calculate the technical parameter of corresponding photon data stream, comprise arrangement path, spectrum allocation may and modulation format, generate stream mapping table and cross-connect matrix according to technical parameter.
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