CN104917678B - Link aggregation method based on SDN - Google Patents
Link aggregation method based on SDN Download PDFInfo
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- CN104917678B CN104917678B CN201510296420.3A CN201510296420A CN104917678B CN 104917678 B CN104917678 B CN 104917678B CN 201510296420 A CN201510296420 A CN 201510296420A CN 104917678 B CN104917678 B CN 104917678B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
- H04L45/245—Link aggregation, e.g. trunking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention provides a kind of link aggregation method based on SDN, and the network topology structure of entire SDN network is perceived including SDN controllers, receives the link-state information offered in SDN switch；According to link-state information and network topology structure, convergence group and member port are calculated；Computational load is balanced and issues flow table；First message is forwarded, so that SDN switch is according to flow table content surface speed forwarding data.The link aggregation method based on SDN of the present invention can obtain full mesh topology structure by SDN controllers according to LLDP agreements, and when SDN controllers find that certain message has the consistent link of a plurality of attribute by SDN network, it is intelligently forwarded based on certain policy selection optimum link, so as to dynamically realize load balancing；It also is able to when this link breaks down that dynamic select link is forwarded again.
Description
Technical field
The present invention relates to the technical fields of network communication, and SDN (Software Defined are based on more particularly to one kind
Network, software defined network) link aggregation method.
Background technology
With extensive use of the ethernet technology in Metropolitan Area Network (MAN) and wide area network field, operator is to using ethernet technology
Backbone links bandwidth and reliability propose increasingly higher demands.In the prior art, the common mode for increasing bandwidth is logical
It crosses the interface board for replacing high-speed or replaces the equipment of high-speed interface board is supported to realize.But this scheme needs to pay
Go out the expense of great number, and underaction.Using link aggregation technology can under conditions of without HardwareUpgring, pass through by
Multiple physical interfaces are tied to a logic interfacing to realize the purpose of increase link bandwidth.Realizing the same of increase bandwidth purpose
When, link aggregation uses the mechanism of backup link, can effectively improve the reliability of link between equipment.
Specifically, link aggregation algorithm of the prior art includes following two：
(1) manual load balancing mode link aggregation
Manual load balancing mode is a kind of most basic link aggregation mode.In this mode, Eth-Trunk
Foundation, the addition of member interface are configured completely by by hand, without the participation of Link Aggregation Control Protocol.Under the pattern it is all into
Member's interface is involved in the forwardings of data, load sharing flow, because of referred to herein as manual load balancing mode.
(2) LACP protocol links polymerize
Under the pattern, the foundation of Eth-Trunk, the addition of member interface and the selection of Active Interface completely by
LACP agreements are completed through consultation.This is meant that on two direct-connected devices for enabling dynamic LACP agreements, does not need to create
Eth-Trunk, it is not required that specifying which interface, two equipment can be negotiated certainly by LACP as aggregation group member interface
The dynamic converging operation for completing link.
As shown in Figure 1, static state Trunk technologies of the prior art and LACP technologies, although can reach multiple physics
Interface is tied to the purpose that a logic interfacing realizes increase link bandwidth.But multiple physical ports must belong to it is same
Interchanger, therefore can not realize the maximum utilizationization of Internet resources.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of link aggregations based on SDN
Based on SDN frameworks, full mesh topology structure is obtained, and send out in SDN controllers by SDN controllers according to LLDP agreements for method
When certain existing message has a plurality of attribute consistent link by SDN network, intelligently carried out based on certain policy selection optimum link
Forwarding, so as to dynamically realize load balancing；It also is able to when this link breaks down that dynamic select link is forwarded again.
In order to achieve the above objects and other related objects, the present invention provides a kind of link aggregation method based on SDN, including
Following steps：Step S1, SDN controllers are according to the network topology structure of the entire SDN network of LLDP protocol awares；Step S2, SDN
Controller receives the link-state information offered in SDN switch；Step S3, SDN controllers are according to link-state information and net
Network topological structure calculates convergence group and member port；Step S4, SDN controllers computational load is balanced and issues flow table；Step
S5, SDN controller forward first message, so that SDN switch is according to flow table content surface speed forwarding data.
According to the above-mentioned link aggregation method based on SDN, wherein：In the step S2, the link-state information packet
MAC Address containing system, port number, port numbers, port speed, duplex module, port stp state and port status.
According to the above-mentioned link aggregation method based on SDN, wherein：The step S2 includes the following steps：
SDN switch establishes control channel, and report current link-state information with SDN controllers；
In certain time interval, SDN switch detection link state；
If detecting, link changes, and reports the link-state information after change；
If not detecting, link changes, and does not perform any operation.
According to the above-mentioned link aggregation method based on SDN, wherein：The step S3 includes the following steps：
A) SDN controllers select main equipment and create convergence group according to link-state information and network topology structure；
B) SDN controllers selection candidate ports；
If c) quantity of candidate ports is less than or equal to the upper limit, candidate ports become selected port；
If d) quantity of candidate ports is more than the upper limit, candidate ports become alternate port.
Further, according to the above-mentioned link aggregation method based on SDN, wherein：In the step a), SDN controllers
Selection main equipment includes the following steps：
SDN controllers compare the LACP treaty override grades of SDN switch；
If the priority of LACP agreements is different, it is main equipment to select the smaller SDN switch of priority；
If the priority of LACP agreements is identical, then comparison system MAC Address, the smaller SDN switch of MAC Address is selected
For main equipment.
Further, according to the above-mentioned link aggregation method based on SDN, wherein：The step b) and including following step
Suddenly：
SDN controllers compare the LACP treaty override grades of port；
If the LACP treaty override grade of port is different, it is candidate ports to select the smaller port of priority；
If the LACP treaty override grades of port are identical, compare the size of port numbers；If port numbers are different, selection port
Number smaller port is candidate ports；If port numbers are identical, it is candidate ports to select the port on main equipment.
According to the above-mentioned link aggregation method based on SDN, wherein：The step S4 includes the following steps：
SDN controllers receive the first message that SDN switch is sent；
SDN controllers select suitable forwarding port according to the configuration strategy of load balancing；
SDN controllers issue all SDN switches in flow table to message forwarding path.
According to the above-mentioned link aggregation method based on SDN, wherein：Further include step S6, the weight when link breaks down
New dynamic select link is forwarded.
Further, according to the above-mentioned link aggregation method based on SDN, wherein：The step S6 includes the following steps：
The selected port for the convergence group that SDN controller SDN switches are sent becomes the message closed, and whether judges this port
To be chosen port；
If not being chosen port, then SDN controllers do not perform any operation；
If selected port, SDN controllers become the port not to be chosen port, related flow table item is removed, is recalculated
Selected port；Further according to the first message of reception, load balancing is recalculated, issue flow table and forwards first message, is carried out based on new
The forwarding of port.
According to the above-mentioned link aggregation method based on SDN, wherein：The SDN switch passes through privately owned extension
Experimenter messages are to SDN controller report link-state informations.
As described above, the link aggregation method based on SDN of the present invention, has the advantages that：
(1) can full mesh topology structure be obtained according to LLDP agreements by SDN controllers；
(2) it can find that certain message has a plurality of attribute (such as same link rate) unanimously by SDN network in SDN controllers
Link when, be intelligently forwarded based on certain tactful (such as purpose MAC, destination IP) selection optimum link, so as to dynamic
Realize load balancing in ground；
It (3) can dynamic select link be forwarded again when link breaks down.
Description of the drawings
Fig. 1 is shown as realizing the structure diagram of link aggregation in the prior art；
Fig. 2 is shown as the structure diagram of link aggregation algorithm of the realization based on SDN of the present invention；
Fig. 3 is shown as the flow chart of the link aggregation method based on SDN of the present invention；
Fig. 4 is shown as the flow chart of the SDN switch reporting links status information of the present invention；
Fig. 5 is shown as the form of the privately owned extension Experimenter messages of privately owned OLT to the SDN controllers of the present invention
Schematic diagram；
Fig. 6 is shown as the flow chart of the SDN controllers calculating convergence group and member port of the present invention；
Fig. 7 is shown as the flow chart of SDN controllers selection main equipment in the present invention；
Fig. 8 is shown as the flow chart of SDN controllers selection candidate ports in the present invention；
Fig. 9 is shown as the flow chart that SDN controllers in the present invention carry out load balancing；
Figure 10 is shown as process chart during link polymerization variation of the present invention；
Figure 11 is shown as the simulation test environment schematic of the link aggregation method based on SDN of the present invention.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
It should be noted that the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way,
Then in schema only display with it is of the invention in related component rather than component count, shape and size during according to actual implementation paint
System, kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout kenel also may be used during actual implementation
It can be increasingly complex.
In the link aggregation method based on SDN of the present invention, SDN controllers obtain entire SDN network according to LLDP agreements
Network network topological structure, and when SDN controllers find that certain message has the consistent link of a plurality of attribute by SDN network, intelligence
Energy ground is forwarded in certain policy selection optimum link, so as to dynamically realize load balancing；It also is able to go out in this link
Dynamic select link is forwarded again during existing failure.
With reference to Fig. 2 and Fig. 3, the link aggregation method of the invention based on SDN includes the following steps：
Step S1, SDN controllers are according to the network topology structure of the entire SDN network of LLDP protocol awares.
Step S2, SDN controllers receive the link-state information offered in SDN switch.
Wherein, link-state information includes system MAC Address, port number, port numbers, port speed, duplex module, port
Stp state and port status.Specific explanations once each information below.
(1) system MAC Address
Wherein, system MAC Address is smaller, and priority is higher.
(2) port number, for representing the quantity of port.
(3) port numbers
Wherein, port numbers are smaller, and priority is higher.
(4) port speed
Specifically, port speed includes tri- kinds of 10M, 100M and 1000M.
(5) dual-mode
Specifically, duplex module includes two kinds of full-duplex mode and semiduplex mode.
(6) port STP (Spanning Tree Protocol, Spanning-Tree Protocol) state
Specifically, port stp state include obstruction (blocking), monitor (listening), study (learning),
Forward (forwarding) and this five kinds of closing (disable).
(7) port status
Specifically, port status include open (UP)/close (Down) both.
SDN switch is needed in both cases to SDN controller report link-state informations.A kind of situation is that SDN is handed over
It changes planes and just establishes control channel with SDN controllers, SDN switch needs to report current link conditions information immediately；Second
When situation is that link changes, SDN switch need to report the link-state information after change immediately.If it does not detect
Link changes, and SDN switch does not perform any operation then.
As shown in figure 4, SDN switch reporting links status information includes the following steps：
41) SDN switch establishes control channel, and report current link-state information with SDN controllers；
42) in certain time interval, SDN switch detection link state；
If 43) detect that link changes, the link-state information after change is reported；
If 44) do not detect that link changes, any operation is not performed.
Specifically, SDN switch by Experimenter messages to SDN controller report link-state informations.
Experimenter messages carry link-state information.In present invention, it is desirable to privately owned expansion is carried out to Experimenter messages
Exhibition.It is reported from OLT (Optical Line Terminal, optical line terminal) to the privately owned extension Experimenter of SDN controllers
The form of text is as shown in Figure 5.Front two row field is original definition in figure, and remaining field is privately owned extended field.Wherein
Experimenter values are 255, are needed to ONF (Open Network Foundation, open network foundation) tissue Shen
Please.When Experimenter type values are 1, it is shown to be from OLT directions to SDN controllers.
Step S3, SDN controllers calculate convergence group and member port according to link-state information and network topology structure.
As shown in fig. 6, step S3 specifically includes following steps：
61) SDN controllers select main equipment and create convergence group according to link-state information and network topology structure.
As shown in fig. 7, SDN controllers select main equipment according to following steps：
71) SDN controllers compare the LACP treaty override grades of SDN switch；
72) if the priority of LACP agreements is different, it is main equipment to select the smaller SDN switch of priority；
If 73) priority of LACP agreements is identical, then comparison system MAC Address, the smaller SDN of MAC Address is selected to hand over
It changes planes as main equipment.
62) SDN controllers selection candidate ports.
Specifically, during SDN controllers selection candidate ports, the attribute of physical port and the category of the logic interfacing of convergence are selected
Property it is consistent, and the smaller port of port numbers be candidate ports.If the port numbers of two physical ports are equal, preferential selection master
Physical port in equipment is candidate ports.
As shown in figure 8, SDN controllers select candidate ports according to following steps：
81) SDN controllers compare the LACP treaty override grades of port；
82) if the LACP treaty override grade of port is different, it is candidate ports to select the smaller port of priority；
83) if the LACP treaty override grades of port are identical, compare the size of port numbers；If port numbers are different, select
The smaller port of port numbers is candidate ports；If port numbers are identical, it is candidate ports to select the port on main equipment.
If 63) quantity of candidate ports is less than or equal to the upper limit, candidate ports become selected (Selected) port, participate in
Load balancing.
If 64) quantity of candidate ports is more than the upper limit, candidate ports become alternative (Standby) port, are responsible for link
Protection.
Step S4, SDN controllers computational load is balanced and issues flow table.
Specifically, when first message is when SDN network forwards, SDN switch can will be first by Packet-in message
Message is sent to SDN controllers.SDN controllers parse first message, calculate suitable turn according to the configuration strategy of load balancing
Originator mouth.It E-Packets to ensure subsequent packet according to the result of calculation of SDN controllers, SDN controllers need to issue flow table
All SDN switches on to message forwarding path.
As shown in figure 9, step S4 specifically includes following steps：
91) SDN controllers receive the first message that SDN switch is sent；
92) SDN controllers select suitable forwarding port according to the configuration strategy of load balancing；
93) SDN controllers issue all SDN switches in flow table to message forwarding path.
Wherein, SDN controllers of the invention support load balancing mode as shown in Table 1.
The load balancing mode that table 1, SDN controllers are supported
| Load balancing mode | Description |
| DST-IP | Controller determines the path forwarded according to the purpose IP address of message |
| DST-MAC | Controller determines the path forwarded according to the target MAC (Media Access Control) address of message |
| SRC-IP | Controller determines the path forwarded according to the source IP address of message |
| SRC-MAC | Controller determines the path forwarded according to the source MAC of message |
| SRC-DST-IP | Controller determines the path forwarded according to the purpose and source IP address of message |
| SRC-DST-MAC | Controller determines the path forwarded according to the source and destination MAC Address of message |
It should be noted that the Flow Match fields of flow table need and the condition of load balancing is consistent.Such as：Load
Equilibrium is to be based on DST-IP, then the Flow Match fields of flow table are also necessary for DST-IP.
For fairness and harmony that proof load is shared, for different modes of sharing, the present invention is selected negative
It is as shown in table 2 to carry equalization algorithm.
Table 2, load-balancing algorithm
Step S5, SDN controllers forwarding first message, so that SDN switch is according to flow table content surface speed forwarding data.
Preferably, further include that step S6, dynamic select link is forwarded again when link breaks down.
Following steps are specifically included with reference to Figure 10, step S6：
101) the Selected ports for the convergence group that SDN controllers SDN switch is sent become the message of Down, judge this
Whether port is Selected ports；
102) if not Selected ports, then SDN controllers do not perform any operation；
If 103) Selected ports, which is become Unselected ports by SDN controllers, removes related flow table
, recalculate Selected ports；SDN controllers recalculate load balancing, issue flow table simultaneously according to the first message of reception
First message is forwarded, carries out the forwarding based on new port.
The simulation test environment of the link aggregation method based on SDN of the present invention is as shown in figure 11.In the test environment,
Following steps are performed successively：
A, mode networking as illustrated；
B, test instrumentation constructs two kinds of flow (Flow1：DST-IP：10.10.10.10Src-IP:
10.10.10.1Flow2：DST-IP：10.10.10.10Src-IP:10.10.10.2)；
C, load balancing is based on SRC-IP, and forwarding port=(SRC-IP1^SRC-IP2^SRC-IP3^ is obtained according to formula
SRC-IP4 the forwarding port of) Mod Selected_Port_Num, Flow1 are that the forwarding port of 3, Flow2 is 0.
In conclusion the link aggregation method based on SDN of the present invention can be obtained by SDN controllers according to LLDP agreements
Full mesh topology structure is obtained, and when SDN controllers find that certain message has the consistent link of a plurality of attribute by SDN network, intelligence
Energy ground is forwarded in certain policy selection optimum link, so as to dynamically realize load balancing；It also is able to go out in this link
Dynamic select link is forwarded again during existing failure.So the present invention effectively overcome various shortcoming of the prior art and
Has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (7)
1. a kind of link aggregation method based on SDN, it is characterised in that：Include the following steps：
Step S1, SDN controllers are according to the network topology structure of the entire SDN network of LLDP protocol awares；
Step S2, SDN controllers receive the link-state information offered in SDN switch；
Step S3, SDN controllers calculate convergence group and member port according to link-state information and network topology structure；It is described
Step S3 includes the following steps：
A) SDN controllers select main equipment and create convergence group according to link-state information and network topology structure；Wherein, SDN
Controller selection main equipment includes the following steps：
SDN controllers compare the LACP treaty override grades of SDN switch；
If the priority of LACP agreements is different, it is main equipment to select the smaller SDN switch of priority；
If the priority of LACP agreements is identical, then comparison system MAC Address, select based on the smaller SDN switch of MAC Address
Equipment；
B) SDN controllers selection candidate ports, include the following steps：
SDN controllers compare the LACP treaty override grades of port；
If the LACP treaty override grade of port is different, it is candidate ports to select the smaller port of priority；
If the LACP treaty override grades of port are identical, compare the size of port numbers；If port numbers are different, selection port number compared with
Small port is candidate ports；If port numbers are identical, it is candidate ports to select the port on main equipment；
If c) quantity of candidate ports is less than or equal to the upper limit, candidate ports become selected port；
If d) quantity of candidate ports is more than the upper limit, candidate ports become alternate port；
Step S4, SDN controllers computational load is balanced and issues flow table；
Step S5, SDN controllers forwarding first message, so that SDN switch is according to flow table content surface speed forwarding data.
2. the link aggregation method according to claim 1 based on SDN, it is characterised in that：In the step S2, the chain
Line state information includes system MAC Address, port number, port numbers, port speed, duplex module, port stp state and port
State.
3. the link aggregation method according to claim 1 based on SDN, it is characterised in that：The step S2 includes following
Step：
SDN switch establishes control channel, and report current link-state information with SDN controllers；
In certain time interval, SDN switch detection link state；
If detecting, link changes, and reports the link-state information after change；
If not detecting, link changes, and does not perform any operation.
4. the link aggregation method according to claim 1 based on SDN, it is characterised in that：The step S4 includes following
Step：
SDN controllers receive the first message that SDN switch is sent；
SDN controllers select suitable forwarding port according to the configuration strategy of load balancing；
SDN controllers issue all SDN switches in flow table to message forwarding path.
5. the link aggregation method according to claim 1 based on SDN, it is characterised in that：Further include step S6, in link
Dynamic select link is forwarded again during failure.
6. the link aggregation method according to claim 5 based on SDN, it is characterised in that：The step S6 includes following
Step：
The selected port that SDN controllers receive the convergence group that SDN switch is sent becomes the message closed, and whether judges this port
To be chosen port；
If not being chosen port, then SDN controllers do not perform any operation；
If selected port, SDN controllers become the port not to be chosen port, related flow table item is removed, is recalculated selected
Port；Further according to the first message of reception, load balancing is recalculated, issue flow table and forwards first message, is carried out based on new port
Forwarding.
7. the link aggregation method according to claim 1 based on SDN, it is characterised in that：The SDN switch passes through private
There are extension Experimenter messages to SDN controller report link-state informations.
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| CN105656799A (en) * | 2016-01-08 | 2016-06-08 | 浪潮集团有限公司 | Scheduling method based on business features in SDN network |
| CN105827524A (en) * | 2016-03-18 | 2016-08-03 | 联想(北京)有限公司 | Information processing method and electronic device |
| CN106100900A (en) * | 2016-08-02 | 2016-11-09 | 浪潮集团有限公司 | A kind of monitoring method of SDN middle port state |
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| CN109120524B (en) | 2018-08-23 | 2020-12-08 | Oppo广东移动通信有限公司 | Link aggregation method and related equipment |
| CN110535764B (en) * | 2019-05-23 | 2022-03-25 | 南京大学 | Method for realizing spatial information network large-scale link simulator |
| CN111049752B (en) * | 2019-12-17 | 2023-01-10 | 锐捷网络股份有限公司 | Load balancing method and device for multiple transmission lines |
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