CN104639450B - The architecture system of packet transmission control method, device and software defined network - Google Patents
The architecture system of packet transmission control method, device and software defined network Download PDFInfo
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Abstract
The invention discloses the architecture system of a kind of packet transmission control method, device and software defined network, to solve controller single in the prior art when the flow to the whole network is controlled, the problem of network load is big and treatment effeciency is low.This method in software defined network by being provided with multiple controllers, and each controller administers corresponding network domains, so that after thering is controller to receive packet forwarding request, preferentially it can judge whether to can determine the flow table of the packet in the network domains of itself administration, when the flow table of the packet can not be determined in the network domains administered at itself, again forwarding request is sent to other connected controllers, to indicate other controllers to determine the flow table of the packet, so as to when for large-scale software defined network, what can be disperseed controls the packet of the whole network to forward, reduce the network load of each controller, so as to accelerate treatment effeciency.
Description
Technical field
The present invention relates to software defined network technical field, more particularly to a kind of packet transmission control method, device and
The architecture system of software defined network.
Background technology
In recent years, the software defined network based on OpenFlow agreements（Software Defined Network, SDN）Skill
Art has turned into the terminal and focus of industry research, and its central characteristics is the separation for realizing datum plane and control plane, and data are put down
Face by support OpenFlow agreements interchanger（Abbreviation OpenFlow interchangers）Formed with terminal etc., control plane is then by one
It is individual to be referred to as controller（Controller）Network element to the whole network carry out centerized fusion.Specifically, OpenFlow interchangers are only
It is responsible for forwarding packet according to flow table information, and flow table information is then controlled by controller.
In a small-scale network, using single controller come to manage the flow of whole network concentratedly be feasible
, but for large-scale network, single controller needs to be controlled the flow of the whole network, so as to cause the control
The network load of device processed is very big, can be more potential that packet can be caused to turn than relatively low in the flow table information timeliness rate of processing data bag
The delay of hair.
The content of the invention
The embodiment of the present invention provides the architecture system of a kind of packet transmission control method, device and software defined network,
To solve controller single in the prior art when the flow to the whole network is controlled, network load is big and treatment effeciency is low
The problem of.
The embodiment of the present invention uses following technical scheme：
A kind of packet transmission control method, applied in software defined network, the software defined network includes more
Individual controller, each controller administer corresponding network domains, and methods described includes：
The controller is asked according to the forwarding for receiving packet to be forwarded, determines the purpose section of the packet
Point；
According to the destination node determined, judge to whether there is the road of the packet in the network domains of itself administration
By forward-path；
When the routing forwarding path be present in the network domains for judging itself administration, the routing forwarding path is write
Enter in flow table, and notify each forward node in the routing forwarding path to turn according to the flow table to the packet
Hair；
When the routing forwarding path is not present in the network domains for judging itself administration, it is connected to the controller
Other controllers send the forwarding request, to indicate that other described controllers determine the flow table of the packet, and according to
The flow table that other described controllers are determined, forward node of the notice in the network domains that itself is administered enter to the packet
Row forwarding.
Optionally, according to the destination node determined, judge to whether there is the number in the network domains of itself administration
According to the routing forwarding path of bag, specifically include：
According to the network topological information of the destination node determined and the network domains itself administered, the purpose is judged
Whether node is in the network domains of itself administration；
When judging the destination node not in the network domains of itself administration, then do not deposited in the network domains of itself administration
In the routing forwarding path of the packet；
When judging that the destination node is in the network domains that itself is administered, according to the link for the network domains that itself is administered
Resource status, judge in the network domains of itself administration with the presence or absence of the routing forwarding path for the forwarding condition for meeting to pre-set；
Wherein, the forwarding condition is：The link utilization between each forward node in routing forwarding path is less than predetermined threshold value；
When judge itself administration network domains in exist meet the forwarding condition routing forwarding path when, then itself
The routing forwarding path of the packet in the network domains of administration be present；
When the routing forwarding path for meeting the forwarding condition is not present in the network domains for judging itself administration, then certainly
The routing forwarding path of the packet is not present in the network domains of barrel linchpin.
Optionally, the multiple controller is according to partition of the level, and between the other controller of adjacent level, high level control
Device is connected with the controller of one or more low levels, administers the network domains that the controller of coupled low level is administered；
Then
The forwarding request is sent to other controllers being connected with the controller, is specifically included：
The forwarding request is sent to the controller for the upper level being connected with the controller.
Optionally, the rank of the multiple controller is identical, and any one controller is connected with one or more controllers,
And the network domains of each controller administration do not repeat mutually；Then
The forwarding request is sent to other controllers being connected with the controller, is specifically included：
The forwarding request is sent to other controllers for the same level being connected with the controller.
A kind of controller, applied in software defined network, the software defined network includes multiple controllers, each
Controller administers corresponding network domains, and the controller includes：
Destination node determining unit, for according to the forwarding request for receiving packet to be forwarded, determining the data
The destination node of bag；
Judging unit, for the destination node determined according to destination node determining unit, judge itself administration
It whether there is the routing forwarding path of the packet in network domains；
First flow table determining unit, for when judging unit judge itself administration network domains in exist it is described route turn
When sending out path, the routing forwarding path is write in flow table, and notify each forward node in the routing forwarding path by
The packet is forwarded according to the flow table；
Second flow table determining unit, for when judging unit judge itself administration network domains in the route is not present
During forward-path, send the forwarding to other controllers being connected with the controller and ask, to indicate other described controls
Device determines the flow table of the packet, and the flow table determined according to other described controllers, net of the notice in itself administration
Forward node in network domain forwards to the packet.
Optionally, the judging unit, is specifically used for：
According to the network topological information of the destination node determined and the network domains itself administered, the purpose is judged
Whether node is in the network domains of itself administration；
When judging the destination node not in the network domains of itself administration, then do not deposited in the network domains of itself administration
In the routing forwarding path of the packet；
When judging that the destination node is in the network domains that itself is administered, according to the link for the network domains that itself is administered
Resource status, judge in the network domains of itself administration with the presence or absence of the routing forwarding path for the forwarding condition for meeting to pre-set；
Wherein, the forwarding condition is：The link utilization between each forward node in routing forwarding path is less than predetermined threshold value；
When judge itself administration network domains in exist meet the forwarding condition routing forwarding path when, then itself
The routing forwarding path of the packet in the network domains of administration be present；
When the routing forwarding path for meeting the forwarding condition is not present in the network domains for judging itself administration, then certainly
The routing forwarding path of the packet is not present in the network domains of barrel linchpin.
Optionally, multiple controllers in the software defined network are according to partition of the level, and the other controller of adjacent level
Between, high level controller is connected with the controller of one or more low levels, administers the control of coupled low level
The network domains that device is administered；Then
Other described controllers are the controller for the upper level being connected with the controller.
Optionally, the rank of multiple controllers in the software defined network is identical, any one controller and one
Or multiple controllers are connected, and the network domains of each controller administration do not repeat mutually；Then
Other described controllers are other controllers for the same level being connected with the controller.
A kind of architecture system of software defined network, including multiple controllers described above, and set in each network domains
There is network link capacity state monitoring apparatus, wherein,
The network link capacity state device, for network described in controller report corresponding to the network domains where it
The link circuit resource state in domain.
The embodiment of the present invention has the beneficial effect that：
The embodiment of the present invention in software defined network by being provided with multiple controllers, and each controller administration is corresponding
Network domains so that when have controller receive packet forwarding request after, can preferentially itself administration network domains in sentence
The disconnected flow table that whether can determine the packet, when the flow table that the packet can not be determined in the network domains administered at itself
When, then forwarding request is sent to other connected controllers, to indicate other controllers to determine the flow table of the packet,
So as to when for large-scale software defined network, disperse to control the packet of the whole network to forward, reduce each control
The network load of device processed, so as to accelerate treatment effeciency.
Brief description of the drawings
Fig. 1 is a kind of implementation process figure of packet transmission control method provided in an embodiment of the present invention；
Fig. 2 is a kind of network architecture signal for being used to realize the multi-controller of the above method provided in an embodiment of the present invention
Figure；
Fig. 3 is a kind of network architecture signal for being used to realize the multi-controller of the above method provided in an embodiment of the present invention
Figure；
Fig. 4 is the stagewise architectural configurations schematic diagram after simplification provided in an embodiment of the present invention；
Fig. 5 is the distributed structure/architecture structural representation after simplification provided in an embodiment of the present invention；
Fig. 6 is a kind of structural representation of controller provided in an embodiment of the present invention；
Fig. 7 is that a kind of system of the architecture system of software defined network provided in an embodiment of the present invention realizes schematic diagram.
Embodiment
In order to solve controller single in the prior art when the flow to the whole network is controlled, network
Load is big and the problem for the treatment of effeciency is low, and the embodiment of the present invention provides a kind of packet transmission control method, device and software and determined
The architecture system of adopted network.The program in software defined network by being provided with multiple controllers, and each controller administration
Corresponding network domains so that, can be preferentially in the network domains of itself administration after thering is controller to receive packet forwarding request
In judge whether to can determine the flow table of the packet, when the stream that the packet can not be determined in the network domains administered at itself
During table, then send forwarding to other connected controllers and ask, to indicate other controllers to determine the stream of the packet
Table, so as to when for large-scale software defined network, disperse to control the packet of the whole network to forward, reduce each
The network load of controller, so as to accelerate treatment effeciency.
Embodiments of the invention are illustrated below in conjunction with Figure of description, it will be appreciated that implementation described herein
Example is merely to illustrate and explain the present invention, and is not intended to limit the invention.And in the case where not conflicting, the reality in this explanation
Applying the feature of example and embodiment can be combined with each other.
The embodiment of the present invention provides a kind of packet transmission control method, is the implementation process figure of this method as shown in Figure 1,
This method is applied in software defined network, and the definition network of the software includes multiple controllers, and each controller administers phase
The network domains answered, mainly comprise the steps：
Step 11, controller is asked according to the forwarding for receiving packet to be forwarded, determines the packet to be forwarded
Destination node；
Wherein, the forwarding request of packet to be forwarded includes the source node of the packet and the information of destination node.
Step 12, according to the destination node determined, judge to be forwarded with the presence or absence of this in the network domains of itself administration
The routing forwarding path of packet；
Wherein, in order to improve the junctor usage in network domains between each node, the step can specifically include：
1st, purpose section is judged according to the network topological information of the destination node determined and the network domains of itself administration first
Whether point is in the network domains of itself administration；
2nd, when judging destination node not in the network domains of itself administration, then in the network domains of itself administration certainly
In the absence of the routing forwarding path of the packet；
3rd, when judging that destination node is in the network domains that itself is administered, further according to the link of the network domains of itself administration
Resource status, judge in the network domains of itself administration with the presence or absence of the routing forwarding path for the forwarding condition for meeting to pre-set；
4th, if it is judged that when the routing forwarding path for meeting above-mentioned forwarding condition be present in the network domains of itself administration, then
The routing forwarding path of the packet in the network domains of itself administration be present；
5th, if it is judged that when the routing forwarding path for meeting the forwarding condition being not present in the network domains of itself administration,
The routing forwarding path of the packet is then not present in the network domains of itself administration；
Wherein, above-mentioned forwarding condition can be：The link utilization between each forward node in routing forwarding path is small
In predetermined threshold value, and junctor usage can then determine according to parameters such as the bandwidth of link, load and/or propagation delay times.
Step 13, when the routing forwarding path that the packet to be forwarded in the network domains for judging itself administration be present
When, the routing forwarding path is write in flow table, and notify each forward node in the routing forwarding path according to the flow table pair
The packet is forwarded；
Step 14, when the routing forwarding path that the packet to be forwarded is not present in the network domains for judging itself administration
When, the forwarding that the packet is sent to other controllers being connected with the controller is asked, to indicate that other controllers determine to be somebody's turn to do
The flow table of packet, and the flow table determined according to other controllers, forwarding section of the notice in the network domains that itself is administered
Point forwards to the packet.
Wherein, when multiple controllers are according to partition of the level, and between the other controller of adjacent level, high level controller with
The controller of one or more low levels is connected, should when administering the network domains that the controller of coupled low level is administered
Other controllers being connected in step with the controller are the controller for the upper level being connected with the controller.
When the rank of multiple controllers is identical, any one controller is connected with one or more controllers, and each control
When the network domains of device administration do not repeat mutually, other controllers being connected in the step with the controller are what is be connected with the controller
Other controllers of same level.
The embodiment of the present invention in software defined network by being provided with multiple controllers, and each controller administration is corresponding
Network domains so that when have controller receive packet forwarding request after, can preferentially itself administration network domains in sentence
The disconnected flow table that whether can determine the packet, when the flow table that the packet can not be determined in the network domains administered at itself
When, then forwarding request is sent to other connected controllers, to indicate other controllers to determine the flow table of the packet,
So as to when for large-scale software defined network, disperse to control the packet of the whole network to forward, reduce each control
The network load of device processed, so as to accelerate treatment effeciency.
Packet transmission control method provided by the invention is described in detail below based on above-mentioned principle.
As shown in Figures 2 and 3, a kind of multi-controller for being used to realize the above method respectively provided in an embodiment of the present invention
Network architecture schematic diagram.
With reference to figure 2, the network architecture includes multiple controllers, and each controller administers corresponding network domains, wherein, it is more
Individual controller is according to partition of the level, and between the other controller of adjacent level, high level controller and one or more low levels
Controller be connected, and network domains that the controller for administering coupled low level is administered.According to the spy of the network architecture
Point can be called stagewise framework.
With reference to figure 3, the network architecture includes multiple controllers, and each controller administers corresponding network domains, wherein, it is more
The rank of individual controller is identical, and any one controller is connected with one or more controllers, and the network of each controller administration
Domain does not repeat mutually.Distributed structure/architecture can be called according to the characteristics of network architecture.
Packet transmission control method is realized based on above-mentioned framework in order to describe in detail, we carry out letter to above-mentioned framework
Change, by taking stagewise framework as an example, as shown in figure 4, being the stagewise architectural configurations signal after simplification provided in an embodiment of the present invention
Figure.Wherein, the framework includes two-step evolution device, and 1 grade of controller and two 2 grades of controllers, 1 grade of controller pass through classification
2 grades of controllers of architecture management two, i.e. 2 grades of controllers -1 and 2 grades of controller -2,1 grade controllers administer the flow table of the whole network node；
And 2 grades of controllers -1 are responsible for the network that control is made up of tetra- nodes of A, B, C and D（Referred to as network domains 1）, 2 grades of controllers -2 are negative
The network that duty control is made up of tetra- nodes of E, F, G and H（Referred to as network domains 2）, the bold portion in figure represented between node
Link, dotted portion represent the connection of controller and each node, for sending the flow table determined to node.
Assuming that there is packet to need to be sent in node D from node B, reference picture 4, this method can specifically include：
First, 2 grades of controllers -1 are asked according to the forwarding for receiving packet X to be forwarded, determine the purpose section of packet
Point is D；
Then, according to the destination node D determined and the network topological information for the network domains 1 itself administered, purpose is judged
Whether node D is in network domains 1；Wherein, the network topological information for the network domains 1 that 2 grades of controllers -1 are administered refer to Fig. 4.
Again, when judging that destination node D is in network domains 1, further according to the link circuit resource state of network domains 1, judge
With the presence or absence of the routing forwarding path for the forwarding condition for meeting to pre-set in network domains 1；Wherein, the forwarding condition is：Road
Predetermined threshold value is less than by the link utilization between each forward node in forward-path.
Specifically, in network domains 1, packet can be according to B-A-D or B-C-D this two paths from node B to section
Point D, then for B-A-D paths, it is necessary to judge whether the link utilization between B-A and A-D is respectively less than default thresholding respectively
Value；For B-C-D paths, it is necessary to judge whether the link utilization between B-C and C-D is respectively less than default threshold value respectively.
Assuming that the link utilization between B-A and B-C all alreadys exceed default threshold value, then in this case, 2 grades
Controller -1 sends the forwarding request of packet to connected upper level controller, i.e. 1 grade of controller, with 1 grade of control of instruction
Device processed determines the flow table of the packet.
Wherein, 1 grade of controller it is determined that the packet flow table when, according to its administration the whole network（Including network domains 1 and net
Network domain 2）Network topological information and link circuit resource state be the packet determine flow table.In the embodiment, the chain in network domains 2
On the premise of road resource status meets default threshold value, 1 grade of controller determines that the routing forwarding path of the packet is B-
F-E-H-D, and the routing forwarding path is write in flow table, while the connected 2 grades of controllers -1 of synchronized update and 2 grades of controls
Flow table in device -2 processed.
Finally, 2 grades of controllers -1 and 2 grades of controllers -2 can notify respective according to the flow table for the packet determined
Forward node in network domains forwards to the packet.
In addition, if the destination node D of packet is not in network domains 1 in the embodiment of the present invention, then 2 grades of controllers -1
Judge after packet X routing forwarding path is not present in network domains 1, then directly sent to other coupled controllers
The forwarding request, to indicate that other controllers determine the flow table of the packet, and the flow table determined according to other controllers,
Forward node in network domains of the notice in itself administration forwards to the packet.
As shown in figure 5, being the distributed structure/architecture structural representation after simplification provided in an embodiment of the present invention, wrapped in the framework
Controller 1, controller 2 to controller n are included, controller 1 is responsible for the network that control is made up of tetra- nodes of A, B, C and D（Referred to as net
Network domain 1）, controller 2 is responsible to control the network being made up of tetra- nodes of E, F, G and H（Referred to as network domains 2）, the solid line portion in figure
The link between node point is represented, dotted portion represents the connection of controller and each node, for sending determination to node
Flow table.
By taking controller 1 and controller 2 as an example, it is assumed that there is packet to need to be sent in node D from node B, it is determined that B-A
Link utilization between B-C whether exceed default threshold value before the step of with above-described embodiment the step of it is identical,
This is repeated no more.Assuming that when the link utilization between B-A and B-C all alreadys exceed default threshold value, then in such case
Under, the forwarding that controller 1 sends controller 2 from packet to connected ad eundem and controller n is asked, to indicate to control
Device 2 and controller n determine the flow table of the packet.
Wherein, when controller 2 determines the flow table of the packet, also want in the connected controller 1 of synchronized update
Flow table, so as to which controller 1 and controller 2 can notify respective network domains respectively according to the flow table for the packet determined
Interior forward node forwards to the packet.
Packet transmission control method based on above-mentioned offer, the embodiment of the present invention additionally provide a kind of controller, the control
Device processed administers corresponding network domains, as shown in fig. 6, including：
Destination node determining unit 61, for according to the forwarding request for receiving packet to be forwarded, determining the number
According to the destination node of bag；
Judging unit 62, for the destination node determined according to destination node determining unit 61, judge from barrel
It whether there is the routing forwarding path of the packet in the network domains of linchpin；
First flow table determining unit 63, for when judging unit 62 judge itself administration network domains in the road be present
During by forward-path, the routing forwarding path is write in flow table, and notify each forwarding section in the routing forwarding path
Point forwards according to the flow table to the packet；
Second flow table determining unit 64, for judge itself administration when judging unit 62 network domains in be not present it is described
During routing forwarding path, send the forwarding to other controllers for being connected with the controller and ask, with indicate it is described other
Controller determines the flow table of the packet, and the flow table determined according to other described controllers, and notice is administered in itself
Network domains in forward node the packet is forwarded.
Optionally, the judging unit 62, can be specifically used for：
According to the network topological information of the destination node determined and the network domains itself administered, the purpose is judged
Whether node is in the network domains of itself administration；
When judging the destination node not in the network domains of itself administration, then do not deposited in the network domains of itself administration
In the routing forwarding path of the packet；
When judging that the destination node is in the network domains that itself is administered, according to the link for the network domains that itself is administered
Resource status, judge in the network domains of itself administration with the presence or absence of the routing forwarding path for the forwarding condition for meeting to pre-set；
Wherein, the forwarding condition is：The link utilization between each forward node in routing forwarding path is less than predetermined threshold value；
When judge itself administration network domains in exist meet the forwarding condition routing forwarding path when, then itself
The routing forwarding path of the packet in the network domains of administration be present；
When the routing forwarding path for meeting the forwarding condition is not present in the network domains for judging itself administration, then certainly
The routing forwarding path of the packet is not present in the network domains of barrel linchpin.
Optionally, when multiple controllers in the software defined network are according to partition of the level, and the other control of adjacent level
Between device, high level controller is connected with the controller of one or more low levels, administers the control of coupled low level
The network domains that device processed is administered；Then
Other described controllers are the controller for the upper level being connected with the controller.
Optionally, when the rank of multiple controllers in the software defined network is identical, any one controller and one
Individual or multiple controllers are connected, and the network domains of each controller administration do not repeat mutually；Then
Other described controllers are other controllers for the same level being connected with the controller.
Packet transmission control method and controller based on above-mentioned offer, the embodiment of the present invention additionally provide a kind of software
The architecture system of network is defined, as shown in fig. 7, being a kind of architecture system of software defined network provided in an embodiment of the present invention
System realizes schematic diagram, including：
Multiple controllers 71 as described in above-mentioned embodiment, and network link capacity state dress is provided with each network domains
72 are put, wherein：
The network link capacity state device 72, it is described for being reported to controller 71 corresponding to the network domains where it
The link circuit resource state of network domains.
It should be noted that multiple controllers 71 can connect according to the distributed structure/architecture in above-described embodiment, can also
Connected according to the stagewise framework in above-described embodiment（The annexation between each controller is not marked in Fig. 7）.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more
Usable storage medium（Including but not limited to magnetic disk storage, CD-ROM, optical memory etc.）The computer program production of upper implementation
The form of product.
The present invention is with reference to method according to embodiments of the present invention, equipment（System）And the flow of computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (9)
- A kind of 1. packet transmission control method, applied in software defined network, it is characterised in that the software defined network Include multiple controllers, each controller administers corresponding network domains, and methods described includes：The controller is asked according to the forwarding for receiving packet to be forwarded, determines the destination node of the packet；According to the destination node determined, judge that the route in the network domains of itself administration with the presence or absence of the packet turns Send out path；When the routing forwarding path being present in the network domains for judging itself administration, the routing forwarding path being write and is flowed In table, and each forward node in the routing forwarding path is notified to be forwarded according to the flow table to the packet；When the routing forwarding path is not present in the network domains for judging itself administration, to its being connected with the controller His controller sends the forwarding request, to indicate that other described controllers determine the flow table of the packet, and according to described The flow table that other controllers are determined, forward node of the notice in the network domains that itself is administered turn to the packet Hair.
- 2. the method as described in claim 1, it is characterised in that according to the destination node determined, judge that itself is administered Network domains in whether there is the packet routing forwarding path, specifically include：According to the network topological information of the destination node determined and the network domains itself administered, the destination node is judged Whether in the network domains of itself administration；When judging the destination node not in the network domains of itself administration, then institute is not present in the network domains of itself administration State the routing forwarding path of packet；When judging that the destination node is in the network domains that itself is administered, according to the link circuit resource for the network domains that itself is administered State, judge in the network domains of itself administration with the presence or absence of the routing forwarding path for the forwarding condition for meeting to pre-set；Wherein, The forwarding condition is：The link utilization between each forward node in routing forwarding path is less than predetermined threshold value；When the routing forwarding path for meeting the forwarding condition be present in the network domains for judging itself administration, then itself is administered Network domains in the routing forwarding path of the packet be present；When the routing forwarding path for meeting the forwarding condition is not present in the network domains for judging itself administration, then from barrel The routing forwarding path of the packet is not present in the network domains of linchpin.
- 3. method as claimed in claim 1 or 2, it is characterised in that the multiple controller is according to partition of the level, and adjacent level Between other controller, high level controller is connected with the controller of one or more low levels, administers coupled low The network domains that the controller of rank is administered；ThenThe forwarding request is sent to other controllers being connected with the controller, is specifically included：The forwarding request is sent to the controller for the upper level being connected with the controller.
- 4. method as claimed in claim 1 or 2, it is characterised in that the rank of the multiple controller is identical, any one control Device processed is connected with one or more controllers, and the network domains of each controller administration do not repeat mutually；ThenThe forwarding request is sent to other controllers being connected with the controller, is specifically included：The forwarding request is sent to other controllers for the same level being connected with the controller.
- 5. a kind of controller, applied in software defined network, it is characterised in that the software defined network includes multiple controls Device processed, each controller administer corresponding network domains, and the controller includes：Destination node determining unit, for according to the forwarding request for receiving packet to be forwarded, determining the packet Destination node；Judging unit, for the destination node determined according to destination node determining unit, judge the network that itself is administered It whether there is the routing forwarding path of the packet in domain；First flow table determining unit, for when judging unit judge itself administration network domains in the routing forwarding road be present During footpath, the routing forwarding path is write in flow table, and notify each forward node in the routing forwarding path according to institute Flow table is stated to forward the packet；Second flow table determining unit, for when judging unit judge itself administration network domains in the routing forwarding is not present During path, send the forwarding to other controllers being connected with the controller and ask, to indicate that other described controllers are true The flow table of the fixed packet, and the flow table determined according to other described controllers, network domains of the notice in itself administration Interior forward node forwards to the packet.
- 6. controller as claimed in claim 5, it is characterised in that the judging unit, be specifically used for：According to the network topological information of the destination node determined and the network domains itself administered, the destination node is judged Whether in the network domains of itself administration；When judging the destination node not in the network domains of itself administration, then institute is not present in the network domains of itself administration State the routing forwarding path of packet；When judging that the destination node is in the network domains that itself is administered, according to the link circuit resource for the network domains that itself is administered State, judge in the network domains of itself administration with the presence or absence of the routing forwarding path for the forwarding condition for meeting to pre-set；Wherein, The forwarding condition is：The link utilization between each forward node in routing forwarding path is less than predetermined threshold value；When the routing forwarding path for meeting the forwarding condition be present in the network domains for judging itself administration, then itself is administered Network domains in the routing forwarding path of the packet be present；When the routing forwarding path for meeting the forwarding condition is not present in the network domains for judging itself administration, then from barrel The routing forwarding path of the packet is not present in the network domains of linchpin.
- 7. the controller as described in claim 5 or 6, it is characterised in that multiple controllers in the software defined network are pressed According to partition of the level, and between the other controller of adjacent level, high level controller and the controller phase of one or more low levels Even, the network domains that the controller of coupled low level is administered are administered；ThenOther described controllers are the controller for the upper level being connected with the controller.
- 8. the controller as described in claim 5 or 6, it is characterised in that multiple controllers in the software defined network Rank is identical, and any one controller is connected with one or more controllers, and the network domains of each controller administration do not repeat mutually； ThenOther described controllers are other controllers for the same level being connected with the controller.
- 9. a kind of architecture system of software defined network, it is characterised in that including multiple as described in any one of claim 5~8 Controller, and be provided with network link capacity state device in each network domains, wherein, the network link capacity state dress Put, for the link circuit resource state of network domains described in controller report corresponding to the network domains where it.
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