CN105959163A - Passive optical interconnection network structure based on software definition and data communication method - Google Patents
Passive optical interconnection network structure based on software definition and data communication method Download PDFInfo
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- CN105959163A CN105959163A CN201610546377.6A CN201610546377A CN105959163A CN 105959163 A CN105959163 A CN 105959163A CN 201610546377 A CN201610546377 A CN 201610546377A CN 105959163 A CN105959163 A CN 105959163A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/009—Topology aspects
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Abstract
The invention discloses a passive optical interconnection network structure based on software definition. The structure comprises terminal nodes, a switching structure based on an optical coupler and a software defined network controller. The switching structure based on the optical coupler is interconnected with the terminal nodes, thereby forming an optical data channel. The software defined network controller is connected with each terminal node, thereby forming an electric control channel. The software defined network controller collects network state information and allocates network resources to the terminal nodes dynamically. The network controller coordinates communication among the nodes through adoption of a software defined medium access control SD-MAC mechanism, collisions occurring in the network are avoided, and the network throughput is improved. According to the SD-MAC mechanism, the bandwidth resources are allocated to the terminal nodes through adoption of a maximum-minimum fair shared bandwidth allocation algorithm, and the fair and order data communication among the terminal nodes is realized.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of passive light Internet structure based on software definition and data communication side
Method.
Background technology
Optical-fiber network has the advantage of high bandwidth and low time delay, is widely used in the scenes such as backbone network, access network and data center network
In.As a example by data center network, traditional data center network (DCN, Data Center Network) uses the tree of layering
Shape topological structure, makes electricity consumption Ethernet switch as switching node.There is a lot of defect in this network: 1) decile bandwidth is little,
Network throughput receives network topology and root node Ethernet switch holds quantitative limitation；2) autgmentability is poor, is positioned at tree topology
The electric exchanger capacity on top is limited, becomes network bandwidth bottleneck and limits the autgmentability of network；3) energy consumption is high, Access Layer, convergence
Layer and core layer use substantial amounts of electricity Ethernet switch, and they consume substantial amounts of energy and energy consumption problem is data center operator
Very important key issue.
Optical interconnection network can solve the problem that the conventional data centers network bandwidth is low, autgmentability is poor and the problem such as energy consumption.With data center's net
As a example by network, light network technology is introduced in data center network, and the Helios network architecture is the representative of the type.Helios framework
It is to be changed planes (ToR switch) and double-layer structure that core layer switch is constituted by electricity frame topcross.The electricity that it is common that frame topcross is changed planes divides
Group switch, core layer is made up of electricity packet switch and optical circuit switch, thus constitutes mixed electrical optical data center network structure.
Wherein core layer electricity packet switch full communication between frame topcross is changed planes, and optical circuit switch is between frame topcross is changed planes
High bandwidth slowly converts the communication of flow (typically long duration flow).Frame topcross is changed planes and is adopted when being connected with optical circuit switch
With wavelength-division multiplex technique the optical multiplexed signal of the different carrier wavelength of multiple ports used in same optical fiber link and be transmitted, fully
The high bandwidth of optical fiber, jumbo characteristic is utilized to improve data center network performance.There are some not in this class optical interconnection network structure
Enough: 1) packet delay is big, use broadcasting and TV path switching mechanism in light exchange, i.e. based on microelectromechanical-systems (MEMS) switch,
When traffic matrix changes, the restructuring procedure of optical circuit switch is very time-consuming, usually a few tens of milliseconds, thus causes network
Time delay is long.2) network energy consumption is big, and still some electricity packet switch in the network architecture of photoelectricity mixing, packet needs
Changing through optical-electrical-optical, consuming substantial amounts of energy increases the energy consumption of network.
In order to reduce cost and the energy consumption of optical interconnection network structure further, passive optical network technique is widely applied to optical interconnected structure
In.As a example by data center network, some new types of data central site networks use passive array waveguide grating router (AWGR) or
The frame at person's passive optical coupler interconnection data center.Owing to Passive Optical Components just can work without power supply supply, compare tradition based on
The network of electricity Ethernet greatly reduces the energy consumption of network, and it is POXN that this kind of network typically represents.In order to dispatching communication flow carries
High network throughput, POXN framework proposes a kind of distributed media access control protocol HEDA to coordinate machine frame inside clothes
Communication between business device.But POXN framework there is also some shortcomings: 1) distributed access control protocol can cause server
Between interactive control information continually, and the data of POXN framework with control information sharing optical link resource, therefore add control
The complexity of plane processed；2) HEDA is a kind of distributed access control protocol, and it needs between the server in frame
Synchronize, owing to the server distance in same frame is shorter, synchronize network-based control plane to be proposed the highest requirement.
In sum, current optical interconnection network structure yet suffers from problems with:
Network energy consumption is big: still uses the topological structure that photoelectricity mixes in application scenes, makes the Ethernet switch of electricity consumption.With
As a example by data center network, the convergence-level of current data center network and core layer are widely used optical switched technology, but in frame
Network still uses electricity packet switch.The port of electricity packet switch need the conversion (O-E-O) carrying out optical-electrical-optical to disappear
Consume big energy.Need to use light network technical substitution electricity frame topcross to change planes, interconnect the server in same frame, thus reduce number
Energy consumption according to central site network.Light network scheme should be not higher than electricity Ethernet switch scheme simultaneously.
Network controls complexity: controlling complexity is the difficult problem needing in EPON to solve.In order to avoid optical wavelength is collided, network needs
Wavelength resource is scheduling, Internet resources are allocated.But control more complicated in area of light, particularly apart from short,
Under the scene that time delay is required.Traditional distributed control mechanism needs to hold consultation between each terminal node, and by each eventually
End node independently makes a policy.The complexity that network controls is embodied in: the information that controls frequently reduces the handling capacity of network alternately；
Use ranging technology to keep synchronizing between terminal node, the system of synchronization is proposed the highest requirement；Each node needs to use same
Fair effective distributed network resource allocation algorithm.Therefore, optical interconnection network structure needs to use a kind of new control mode to reduce
The complexity controlled, the granularity simultaneously improving control.
Packet end-to-end time delay is big: application scenes still uses the topological structure that photoelectricity mixes, a part of Web vector graphic light network
Technology, another part Web vector graphic electricity Ethernet switch.Such as in data center network, now switch uses Store and forword
Working method, the optical signal first received is converted to the signal of telecommunication and stores, and after queuing up and processing, then is turned by the signal of telecommunication
Change optical signal into and be sent to next-hop node.This process can cause the end-to-end time delay of packet big, be difficult to meet some application (as
Cloud computing apply) real-time demand.
Summary of the invention
In consideration of it, it is an object of the invention to provide a kind of passive light interconnection network architecture based on software definition and data communications method.
An object of the present invention is achieved through the following technical solutions,
A kind of passive light interconnection network architecture based on software definition, including terminal node, switching fabric based on photo-coupler and soft
The network controller of part definition, switching fabric coupling terminal node based on photo-coupler constitutes light data channel；The net of software definition
Network controller connects each terminal node and constitutes the control passage of electricity, and the network controller collection network status information of software definition is also
Terminal node dynamically distributes Internet resources.
Further, software defined network controller uses the media access control mechanism of software definition, particularly as follows: terminal node passes through
Control channel and send request message to software defined network controller；The request of each terminal node collected by software defined network controller
Demand assignment Internet resources according to terminal node after message, inform each terminal node by allocation result by controlling channel；Terminal saves
Point uses corresponding Internet resources to complete data communication.
Further, the media access control mechanism of software definition uses maximum-minimum Fairshare bandwidth allocation algorithm to be terminal node
Distribution Internet resources.
Further, described terminal node configuration light source, light source can use laser with fixed wavelength or Wavelength tunable laser, light source
There is provided light carrier for data modulation and transmission for terminal node.
Further, described switching fabric based on photo-coupler uses 2 × 2 photo-couplers or the cascade of 3 × 3 photo-couplers to constitute
Banyan network structure.
The two of the purpose of the present invention are achieved through the following technical solutions, a kind of passive light interconnection network architecture based on software definition
Data communications method, comprise the following steps:
Information registering: actively can send " registration message " to the network controller of software definition when terminal node starts or networks, should
Message includes: the IP address of terminal node, MAC Address and current length of buffer queue；Software defined network controller receives
Should succeed in registration to terminal node transmission " registration message confirmation " expression after " registration message "；If not receiving, terminal node may proceed to
Register to network controller；The network controller of software definition needs to maintain a Registry, and this log-on message table record is current
Node in running order in network, software defined network controller is the terminal node distribution Internet resources on Registry；
Bandwidth is distributed: in each wheel, terminal node sends request message to software defined network controller, comprises in this request message
The length of buffer queue of node；After the network controller of software definition have collected the request message of each terminal node, employing maximum-
Minimum Fairshare bandwidth allocation algorithm is the stock number that each terminal node calculates distribution；After distribution terminates, software defined network
Controller sends " authorization messages " by controlling channel to terminal node, contains the result of epicycle bandwidth distribution in authorization messages；
Data are transmitted: each terminal node carries out sending out of data according to the mandate of software defined network controller after receiving authorization messages
Sending, each terminal node carries out the transmission of data in its corresponding time period thus avoids network to collide；Each terminal node is at self
Time slot sends " report message " to software defined network controller after terminating, and notice its data of software defined network controller have sent
Become and inform the length of buffer queue information that the network controller of software definition is current；Software defined network controller updates buffer queue
The foundation that length value distributes as next cycle Internet resources.
Owing to have employed technique scheme, present invention have the advantage that:
1) present configuration can reduce the cost of network.This programme is applied in racks of data centers in network, to this network
Cost carry out numerical analysis, with existing use electricity grouping frame topcross change planes (ToR Switch) data center network compared with, this
The cost of invention network structure is less.
2) present configuration can reduce the energy consumption of network.This programme is applied in racks of data centers in network, to this network
Energy consumption carry out numerical analysis, with existing use the electricity data center network changed planes of grouping frame topcross compared with, inventive network structure
Energy consumption is less.
3) present configuration can reduce the packet end-to-end time delay between terminal node.This programme is applied to racks of data centers
In interior network, the packet end-to-end time delay of this network is carried out simulation analysis, in the data that grouping frame topcross electric with existing employing is changed planes
Heart network is compared, and the packet end-to-end time delay between inventive network configuration terminal node is less.
4) present configuration can improve the reliability of network.Scheme uses Passive Optical Components, with traditional Ethernet switch
Comparing, network structure has higher reliability.
5) present configuration uses the media access control mechanism of software definition, and this mechanism uses maximum-minimum Fairshare bandwidth to divide
Join algorithm and ensure that Internet resources are distributed fairly to each terminal node in network；Meanwhile, compared with traditional fixing TDM scheme,
This algorithm can improve the handling capacity of network.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is made the most in detail
Thin description, wherein:
Fig. 1 is passive light interconnection network architecture based on software definition；
Fig. 2 is passive light interconnection network architecture application of network in racks of data centers based on software definition；
Fig. 3 is the media access control mechanism of software definition；
Fig. 4 is that SD-POIN scheme compares with the networking cost of electricity Ethernet switch scheme；
Fig. 5 is SD-POIN scheme with the networking observable index of electricity Ethernet switch scheme relatively；
Fig. 6 is that SD-POIN scheme compares with the packet end-to-end time delay of electricity Ethernet switch scheme；
Fig. 7 is that maximum-minimum Fairshare bandwidth allocation algorithm compares with the network throughput of fixing time division multiplex algorithm；
Fig. 8 is the media access control mechanism population structure of software definition.
Detailed description of the invention
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；Should be appreciated that preferred embodiment only for
The present invention is described rather than in order to limit the scope of the invention.
A kind of passive light interconnection network architecture based on software definition (SD-POIN, Software Defined Passive Optical
Interconnection Networks), including terminal node, switching fabric based on photo-coupler and the network controller of software definition,
Switching fabric coupling terminal node based on photo-coupler constitutes light data channel；Software defined network controller connects each terminal node
Constituting the control passage of electricity, software defined network controller collection network status information also dynamically distributes Internet resources for terminal node.
Terminal node needs to configure light source, and light source provides light carrier for data modulation and transmission for terminal node.Certain terminal node can
To select laser with fixed wavelength or Wavelength tunable laser as light source.Selecting laser with fixed wavelength, all of terminal saves
Point all uses identical wavelength, and the most different terminal nodes needs to use this wavelength to communicate in the different moment, otherwise wavelength meeting
Collide；Selecting Wavelength tunable laser, terminal node can use different wavelength to communicate, the distribution of Internet resources
The most flexible.In view of laser with fixed wavelength than the low cost of Wavelength tunable laser, in the present invention, terminal node light source is preferential
It is considered as identical, laser with fixed wavelength as light source.
Switching fabric based on photo-coupler: photo-coupler is a kind of Passive Optical Components, it is not necessary to power supply supply just can work.Therefore,
Optical switching network based on bonder can reduce the energy consumption of network.The optical signal received is broadcasted by photo-coupler, the suitableeest
Close the flow rate mode of Multicast Yu Incast.Commercial photo-coupler is mainly 2 × 2 bonders and 3 × 3 bonders, in order to
Network interconnects more terminal node, the present invention uses the Banyan that 2 × 2 photo-couplers or the cascade of 3 × 3 photo-couplers are constituted
Network structure.
The network controller of software definition: the network controller of software definition is connected to each terminal node by electricity Ethernet and constitutes control
Passage processed.Owing to terminal node uses identical wavelength to communicate, if multiple terminal node sends data stream, net to network simultaneously
Network there will be collision.Therefore, controller needs to solve the technical problem in terms of following two: 1) Access Control, software definition
Network controller uses time division multiplexing mode distribution Internet resources, it is allowed to different terminal nodes is at its in network of different moment
Its terminal node sends data, thus avoids network to collide；2) Dynamic Bandwidth Allocation, software defined network controller needs to collect
The bandwidth demand of each node, as desired dynamic bandwidth allocation thus improve network throughput, the distribution of Internet resources simultaneously should be
Fair.
The network controller of software definition uses media access control mechanism (SD-MAC, the Software Defined of software definition
Medium Access Control), the target of this mechanism is to distribute Internet resources liberally for each terminal node, thus avoids net
Network collides, and improves the handling capacity of network.This mechanism is particularly as follows: terminal node is by controlling channel to software defined network control
Device sends request message；The network controller of software definition collects the demand after the request message of each terminal node according to terminal node
Distribution Internet resources, inform each terminal node by allocation result by controlling channel；Terminal node uses corresponding Internet resources to complete
Data communication.
The media access control mechanism of software definition uses maximum-minimum Fairshare bandwidth allocation algorithm to be that terminal node distributes network
Resource.By this algorithm, Internet resources can be distributed fairly to need the terminal node of communication, the resource that a terminal node obtains
Will not be more than the resource of its request, the resource simultaneously asking unmet terminal node to be distributed will obtain more than other requests
To the terminal node met, thus the utilization ratio of join Internet resources.
Present invention also offers the data communications method of a kind of passive light interconnection network architecture based on software definition, including:
Information registering: actively can send " registration message " to the network controller of software definition when terminal node starts or networks, should
Message includes: the IP address of terminal node, MAC Address and current length of buffer queue；Software defined network controller receives
Should succeed in registration to terminal node transmission " registration message confirmation " expression after " registration message "；If not receiving, terminal node may proceed to
Register to the network controller of software definition；Software defined network controller needs to maintain Registry (RIT, a Routing
Information Table), node in running order in this log-on message table record current network, software defined network controls
Device is the terminal node distribution Internet resources on Registry.Can be only on Registry due to software defined network controller
Node distribution Internet resources, therefore, when the address information of certain terminal node changes or enters dormancy, off-mode,
This terminal node needs actively to send " registration update message " to the network controller of software definition, the network controller of software definition
The behavior is confirmed after updating Registry.
Bandwidth is distributed: in each wheel, terminal node sends request message to software defined network controller, comprises in this request message
The length of buffer queue of node；After the network controller of software definition have collected the request message of each terminal node, employing maximum-
Minimum Fairshare bandwidth allocation algorithm is the stock number that each terminal node calculates distribution；After distribution terminates, software defined network
Controller sends " authorization messages " by controlling channel to terminal node, contains the result of epicycle bandwidth distribution in authorization messages；
Data are transmitted: each terminal node carries out sending out of data according to the mandate of the network controller of software definition after receiving authorization messages
Sending, each terminal node carries out the transmission of data in its corresponding time period thus avoids network to collide；Each terminal node is when self
Gap sends " report message " to software defined network controller after terminating, and notice its data of software defined network controller are sent completely
And inform the length of buffer queue information that the network controller of software definition is current；The network controller of software definition updates buffer queue
The foundation that length value distributes as next cycle Internet resources.
The present invention " passive light interconnection network architecture based on software definition and data communications method " can be deployed in data in practice
In the frame Intranet network of center.SD-POIN structure is illustrated as a example by data center network by we with SD-MAC mechanism.Figure
2 illustrate the application in racks of data centers of the SD-POIN structure, and in data center, the server in frame passes through photo-coupler
Structure interconnects, the data communication in software definition controller dispatch server frame.As it is shown on figure 3, in data center server from
It is linked into and carries out the flow process of data communication and include:
Step 301: when startup of server or networking, actively sending " log-on message " to software definition controller, this information includes:
Server and virtual machine IP address, current length of buffer queue etc..After controller receives this " log-on message ", to service
Device sends " registration confirmation message " and represents server registration success.If not receiving, the server renewal of registration.Controller maintains one
Registry (RIT), if certain station server succeeds in registration, adds relevant entries the most in the table.Controller can be log-on message
List item distribution Internet resources in table.
Step 302: the request message of each station server collected by software definition controller, comprises the slow of each station server in request message
Depositing queue length, controller uses maximum-minimum Fairshare bandwidth allocation algorithm to be that every station server distributes bandwidth resources.Then
Server in frame sends authorization messages, and authorization messages have recorded the result of bandwidth distribution.Server uses corresponding bandwidth money
Source carries out the data in frame and sends.
Step 303: after server receives the authorization messages that controller sends, carry out the transmission of data in the time period that controller is specified.
At synchronization, at most one station server sends data in frame, and network therefore can be avoided to collide.Server terminates data and sends out
Needing after sending to send report message to controller, this report message is to inform that controller oneself provides not in use by the network in frame
Source；Meanwhile, server also needs to inform the length of buffer queue that self is current controller, and controller updates the caching team of server
The foundation that row length information distributes as next cycle each station server bandwidth.
Below in conjunction with accompanying drawing 8, the media access control mechanism of software definition enforcement within a cycle in the present invention is carried out
Describe in detail.
In the examples below, server is connected by Ethernet with software definition controller, and control information is passed by ethernet link
It is passed to software definition controller.
Step 801 a: cycle, software definition controller was broadcasted " authorization message " in frame by Ethernet at first,
Servers-all in frame can receive this authorization message.After receiving authorization message, server can find according to address information relatively
The timeslice answered.
Step 802: server 1 first uses Internet resources in frame.Server 1 opens laser instrument server in same frame
N sends message.
Step 803: optical signal arrives optical interconnected structure based on bonder, signal is also broadcast to machine by photo-coupler cutting optical signal
Servers-all in frame.Server 2 and server N can receive this optical signal, after converting optical signals to the signal of telecommunication,
Server can check the destination address of packet header.Server 2 finds this packet the most to one's name, then abandons packet；Service
Device N finds this packet to one's name, then receives packet.
Step 804: the timeslice of server 1 terminates, server 1 stops sending data in frame.Server 1 is fixed to software
Justice controller sends report message, and it is over the transmission of data to inform software definition controller, and by oneself current caching
Queue length is reported to software definition controller, as the foundation of next cycle bandwidth resource allocation.
Step 805: server 2 opens laser instrument, starts other server in frame and sends data.
Step 806: repeat above step until the Servers-all on software definition controller Registry is all in frame
Network have sent a secondary data.So far, software definition controller have updated the length of buffer queue of Servers-all, and it is permissible
Using maximum-minimum Fairshare bandwidth allocation algorithm is the bandwidth resources that every station server calculates next period allocated.
This example achieves the data transmission of network in the frame in the dispatching cycle.
The present invention " passive light interconnection network architecture based on software definition and data communications method " is applied to the frame of data center
In internal network.Traditional data center network makes electricity consumption Ethernet exchanging (also referred to as frame topcross is changed planes, ToR) interconnect same machine
Server in frame, uses now passive light interconnection network architecture based on software definition to interconnect same frame server, passes through
The communication of SD-MAC mechanism scheduling frame server.The present invention changes planes with traditional electric frame topcross compared with interconnection scheme, has
Following advantage:
1) present configuration can reduce the cost of data center network.The cost of this network structure is carried out numerical analysis, with existing
Having and use the change planes data center network of (ToR Switch) of electricity grouping frame topcross to compare, the cost of inventive network structure is less.
Fig. 4 illustrates along with frame server number increases, and SD-POIN scheme and frame topcross scheme cost of changing planes increases the most therewith,
And the cost of SD-POIN scheme is advanced the speed and is changed planes scheme less than frame topcross；And when number of servers one timing, frame topcross is changed planes
The cost of scheme is higher than SD-POIN scheme.
2) present configuration can reduce the energy consumption of data center network.The energy consumption of this network structure is carried out numerical analysis, with existing
Having the data center network using electricity grouping frame topcross to change planes to compare, the energy consumption of inventive network structure is less.Fig. 5 illustrate with
Frame server number to increase, the change planes energy consumption of scheme of frame topcross increases therewith, and it is very fast to advance the speed, and SD-POIN
Increase slowly with the increase energy consumption of server.The photo-coupler being primarily due to the use of SD-POIN scheme is Passive Optical Components, can
To work under there is no power supply supply.
3) present configuration can reduce the packet end-to-end time delay in data center network between machine frame inside server.Fig. 6 ratio
Relatively SD-POIN scheme and frame topcross are changed planes the packet end-to-end time delay between scheme machine frame inside server.Result shows, with
The increase of offered load, the end-to-end time delay of two schemes is all increasing, but the packet end-to-end time delay of SD-POIN scheme increases
Long speed is slow, and the change planes packet end-to-end time delay rate of rise of scheme of frame topcross is very fast.And the packet of SD-POIN end-to-end time
Prolonging changes planes medium and small than being grouped in frame topcross, and therefore, the present invention program has obvious advantage on delay performance.
4) present configuration uses the media access control mechanism of software definition, and this mechanism uses maximum-minimum Fairshare bandwidth to divide
Join algorithm ensure Internet resources be distributed fairly to frame in all of server；Meanwhile, with traditional fixing TDM scheme phase
Ratio, this algorithm can improve the handling capacity of network in frame.Fig. 7 compares in frame when using both bandwidth allocation algorithms
Network throughput.Along with the network throughputs based on two kinds of bandwidth allocation algorithms that increase of load all increase, when offered load arrives
When reaching 0.6, based on fixing time-multiplexed network throughput less than the network throughput under maximum-minimum Fairshare bandwidth allocation algorithm
Amount.Therefore, the media access control mechanism of the software definition that the present invention proposes uses maximum-minimum Fairshare bandwidth allocation algorithm
The handling capacity of network in lift carriage, ensures bandwidth distributional equity simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, it is clear that those skilled in the art is permissible
The present invention is carried out various change and modification without departing from the spirit and scope of the present invention.So, if the present invention these amendment and
Modification belongs within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these changes and modification exists
In.
Claims (6)
1. a passive light interconnection network architecture based on software definition, it is characterised in that: include terminal node, based on photo-coupler
Switching fabric and the network controller of software definition, switching fabric coupling terminal node based on photo-coupler constitutes light data channel；
The network controller of software definition connects each terminal node and constitutes the control passage of electricity, the network controller collection network of software definition
Status information also dynamically distributes Internet resources for terminal node.
Passive light interconnection network architecture based on software definition the most according to claim 1, it is characterised in that: the net of software definition
Network controller uses the media access control mechanism of software definition, particularly as follows: terminal node is sent out to network controller by controlling channel
Send request message；Network controller collects the demand assignment Internet resources after the request message of each terminal node according to terminal node,
Allocation result is informed each terminal node by controlling channel；Terminal node uses corresponding Internet resources to complete data communication.
Passive light interconnection network architecture based on software definition the most according to claim 2, it is characterised in that: the matchmaker of software definition
Body access control mechanism uses maximum-minimum Fairshare bandwidth allocation algorithm to be that terminal node distributes Internet resources.
Passive light interconnection network architecture based on software definition the most according to claim 1, it is characterised in that: described terminal node
Configuration light source, light source provides light carrier for data modulation and transmission for terminal node.
Passive light interconnection network architecture based on software definition the most according to claim 1, it is characterised in that: described based on optocoupler
The switching fabric of clutch uses the Banyan network structure that 2 × 2 photo-couplers or the cascade of 3 × 3 photo-couplers are constituted.
6. the data communications method of a passive light interconnection network architecture based on software definition, it is characterised in that: comprise the following steps:
Information registering: actively can send " registration message " to the network controller of software definition when terminal node starts or networks, this disappears
Breath includes: the IP address of terminal node, MAC Address and current length of buffer queue；The network controller of software definition receives
Should succeed in registration to terminal node transmission " registration message confirmation " expression after " registration message "；If not receiving, terminal node meeting
Continue to register to network controller；The network controller of software definition needs to maintain a Registry, this log-on message table record
Node in running order in current network, network controller is the terminal node distribution Internet resources on Registry；
Bandwidth is distributed: in each wheel, terminal node sends request message to the network controller of software definition, comprises joint in this request message
The length of buffer queue of point；After software defined network controller have collected the request message of each terminal node, use maximum-minimum
Fairshare bandwidth allocation algorithm is the stock number that each terminal node calculates distribution；After distribution terminates, network controller is by control
Channel processed sends " authorization messages " to terminal node, contains the result of epicycle bandwidth distribution in authorization messages；
Data are transmitted: each terminal node carries out the transmission of data according to the mandate of software defined network controller after receiving authorization messages, often
Individual terminal node carries out the transmission of data in its corresponding time period thus avoids network to collide；Each terminal node terminates at self time slot
Sending " report message " to the network controller of software definition afterwards, its data of network controller of notice software definition are sent completely also
Inform the length of buffer queue information that software defined network controller is current；Software defined network controller updates length of buffer queue value
Foundation as the distribution of next cycle Internet resources.
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