CN106027641A - TCP (Transmission Control Protocol) connection multiplexing method based on SDN (Software Defined Network) - Google Patents
TCP (Transmission Control Protocol) connection multiplexing method based on SDN (Software Defined Network) Download PDFInfo
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- CN106027641A CN106027641A CN201610333969.XA CN201610333969A CN106027641A CN 106027641 A CN106027641 A CN 106027641A CN 201610333969 A CN201610333969 A CN 201610333969A CN 106027641 A CN106027641 A CN 106027641A
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- tcp connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/142—Managing session states for stateless protocols; Signalling session states; State transitions; Keeping-state mechanisms
Abstract
The invention discloses a TCP (Transmission Control Protocol) connection multiplexing method based on an SDN (Software Defined Network). By an SDN controller, HTTP (Hyper Text Transport Protocol) requests of a plurality of clients at a front end are multiplexed to a TCP connection established between an SDN switch and a server, and the SDN controller carries out uniform TCP connection multiplexing technical management and configuration. The TCP connection multiplexing method comprises the steps that: the SDN controller is provided with a TCP connection list, and the TCP connection list comprises a plurality of pieces of TCP connection information; the clients sent requests of establishing TCP connections with the server; the SDN controller inquires in the TCP connection list and acquires matched TCP connections; and by using the matched TCP connections, establishing the TCP connections between the clients and the server. According to the TCP connection multiplexing method disclosed by the invention, by implementing TCP connection multiplexing in the SDN, complexity caused by decentralized management on load balancing equipment in a conventional network is abandoned; the TCP connection multiplexing method is simple and flexible to configure; efficient centralized management is implemented; and network operation efficiency is improved.
Description
Technical field
The present invention relates to software defined network (Software Defined Network, SDN) technical field,
Particularly relate to a kind of TCP connection multiplexing method based on SDN.
Background technology
In conventional internet framework, between client with server, HTTP to be set up is connected, basic process
Method is, client needed elder generation and server to carry out TCP three-way handshake before sending HTTP request, set up
TCP connects, and then sends HTTP request.Server processes after receiving HTTP request, and by process
Result sends back client, and then client and server sends mutually FIN true at the ACK receiving FIN
Closing after recognizing and connect, a complete HTTP request response terminates.
Along with technology develops, occur in that TCP connection multiplexing technology based on conventional internet network.Such as Fig. 1 institute
Show, carry out three-way handshake and send HTTP between client (such as: ClientA) and load-balancing device
Request；After load-balancing device receives request, can detect whether server exists the long connection of free time, if
Not existing, server will set up a new connection.After HTTP request has responded, client then with load
Balancing equipment consults to cut out and connects, load balancing then keep between server this be connected.When there being it
When its client (such as: ClientB) needs to send HTTP request, load-balancing device can directly to clothes
This idle connection the keep between business device sends HTTP request, thus realizes TCP connection multiplexing.This
In implementation, load-balancing device scattering device, in network, needs to be managed for configuration respectively.
To 2006, software defined network rose, and this new network innovation framework is the one of network virtualization
Kind of implementation, its core technology OpenFlow by network equipment chain of command is separated with data surface,
It is achieved thereby that the flexible control of network traffics.Control on the network equipment is separated by SDN, by concentrating
Controller management, underlay network device (router, switch, fire wall) need not be relied on, shield
From the difference of underlay network device.And control is wide-open, user can with self-defined any want realize
Network route and transmission rule strategy, thus more flexible and intelligent.Motility that SDN possesses and agility
More can adapt to the service environment that the Internet/mobile Internet is fast changing, therefore, in recent years SDN this
Generation Interworking GateWay key technology is flourish, and it has promoted Future Internet technological innovation.Including HP, IBM,
Cisco, NEC and domestic Huawei, H3C, in the legacy network devices such as emerging manufacture commercial city and join the most one after another
The camp of SDN and OpenFlow, have some to support the network hardware equipment of OpenFlow has emerged simultaneously.
Realizing data communication based on SDN and become trend, the related specifications of SDN Yu OpenFlow continues with standard
Evolution, numerous functions realized based on conventional internet network are required for SDN framework and redesign realization, because of
This TCP connection multiplexing technology based on SDN becomes a problem urgently to be resolved hurrily.Simultaneously as SDN will
The control of the network equipment is separated, controller manage concentratedly, therefore, it can by SDN controller
Configuration item needed for centralized configuration management TCP connection multiplexing technology, has abandoned TCP connection multiplexing in legacy network
The complexity that technology needs Decentralization load-balancing device and brings, configures simple and flexible, it is achieved efficiently collect
Middle management, raising network operation efficiency.
Summary of the invention
It is an object of the invention to provide a kind of TCP connection multiplexing method based on SDN, to realize
SDN is used TCP connection multiplexing, by controller, the HTTP request of multiple for front end clients is multiplexed into
The TCP that SDN switch is set up with server is connected, controller carry out unified TCP connection multiplexing
Technical management and configuration.Decentralization load-balancing device in abandoning tradition network and the complexity brought, join
Put simple and flexible, it is achieved efficiently centralized management, raising network operation efficiency.
A kind of based on SDN the TCP connection multiplexing method that the present invention provides, utilizes based on SDN
Existing TCP between TCP connection establishment client and server is connected, including step:
After client sends and sets up, with server, the request message that TCP is connected, the inquiry of SDN controller is arranged at
TCP connection table on SDN controller, this TCP connection table comprises some TCP link informations；
Obtain coupling TCP inquired to connect；
The TCP between TCP connection establishment client and the server of coupling is used to be connected.
Preferably, TCP connection table comprises mark IP address and/or the Mac address of SDN switch.
Preferably, in TCP connection table record TCP link information data including at least server IP address,
The currently used state that the free time of TCP link information and TCP connect.
According to a preferred embodiment of the invention, SDN controller is provided with the free time reference value that TCP connects,
When in TCP connection table, the free time of TCP link information is more than reference value, SDN controller performs a TCP
Connect aging deletion action.
According to a preferred embodiment of the invention, it is privately owned to SDN controller report also to include SDN switch
The step of information, private information identification information Han SDN switch.
Preferably, SDN switch uses expansible message Experimenter to its private of SDN controller report
Having information, the Experimenter field of Experimenter message is set to 255, Experimenter Type
Field is set to 1, Experimenter message privately owned field storage SDN switch private information.
Preferably, in TCP connection table during match query TCP link information, use the IP address of server
And/or Port Id is as key word of the inquiry.
According to a preferred embodiment of the invention, further comprise the steps of:
Between client and server after DTD, SDN controller retains SDN switch and server
Between TCP connect；
In TCP connection table, the TCP connection state of reservation is labeled as the free time.
According to a preferred embodiment of the invention, also include TCP connect aging delete step:
Judge in described TCP connection table that the connection free time of each TCP link information is the most overtime；
If overtime, the overtime TCP closed between SDN switch and server is connected；
Overtime TCP link information in TCP connection table is deleted.
According to another preferred embodiment of the invention, the request message sent according to client at SDN controller
After inquiry TCP connection table, if the TCP that there is coupling in TCP connection table connects, and the TCP mated
Connect the free time, then use the TCP connection multiplexing method that the present invention proposes, the TCP of multiplexing coupling to connect；As
The TCP that really there is not coupling in TCP connection table connects, or the TCP connection of coupling is presently using,
Then perform following steps:
SDN controller is set up new TCP and is connected；
The SDN controller new TCP of use is connected as between client with server setting up TCP and is connected
SDN controller increases new TCP in TCP connection table and connects, and state is configured such that in use.
By above solution, the present invention realizes using TCP connection multiplexing, abandoning tradition in SDN
Decentralization load-balancing device in network and the complexity brought, configure simple and flexible, it is achieved efficiently concentrate
Management, raising network operation efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described.It should be evident that describe below
In accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the prior art schematic flow sheet of the present invention；
Fig. 2 is the operation principle network diagram of the present invention；
Fig. 3 is first embodiment of the present invention schematic diagram；
Fig. 4 is second embodiment of the present invention schematic flow sheet；
Fig. 5 is the TCP Connection inquiring operating process schematic diagram of the present invention；
Fig. 6 is the Experimenter message schematic diagram of the present invention；
Fig. 7 is that the TCP of the present invention connects opening operation schematic flow sheet；
Fig. 8 is that the TCP of the present invention connects aging deletion schematic flow sheet.
Drawing reference numeral illustrates:
SDN controller 10, SDN switch 20, server 30,
Client 40, the privately owned field of Experimenter message 50, TCP connection table 60.
Detailed description of the invention
Below in conjunction with the accompanying drawings the preferred embodiments of the present invention are described in detail so that advantages of the present invention and
Feature can be easier to be readily appreciated by one skilled in the art, thus makes protection scope of the present invention apparent
Clear and definite defines.It should be evident that the accompanying drawing in describing below is only the section Example of the present invention, right
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these
Accompanying drawing obtains other accompanying drawing, and obtains other embodiment.
For making simplified form, only schematically show part related to the present invention in each figure, they are also
Do not represent its practical structures as product.It addition, so that simplified form readily appreciates, have in some figure
There are the parts of identical structure or function, only symbolically depict part-structure therein signal, or only mark
One of them.In this article, " one " not only represents " only this ", it is also possible to represent " many
In one " situation.
The embodiment provides a kind of TCP connection multiplexing method based on SDN, to realize
In SDN use TCP connection multiplexing, Decentralization load-balancing device in abandoning tradition network and bring
Complexity, configures simple and flexible, it is achieved efficiently centralized management, raising network operation efficiency.
Shown in Fig. 2, proposing first embodiment of the invention, this inventive embodiments is based on SDN.SDN
Network includes that SDN controller 10 and SDN switch 20, SDN controller 10 are responsible for generating and issuing data
Stream table, SDN switch 20 carries out data forwarding according to stream table.Client 40 by SDN switch 20 with
Server 30 is set up TCP and is connected.Herein, for the simplicity in narration, SDN switch 20 turns for realizing data
The Internet Component sending out function is referred to as, and it can be single SDN switch, multiple SDN switch, or
The Internet Component combination of SDN switch data forwarding capability can be realized.
Shown in Fig. 3, in this inventive embodiments, SDN controller 10 is provided with TCP connection table 60,
TCP connection table 60 records the TCP link information between SDN switch 20 and some servers 30.Enter
One step, TCP connection table 60 comprises SDN switch 20 and identifies, SDN switch 20 and TCP connection table
60 is corresponding.
When client 40 sets up, with server 30, the request that TCP is connected to SDN switch 20 transmission, SDN
Switch 20 searches coupling link information in TCP connection table 60, after finding available coupling connection, and SDN
Controller 10 uses the TCP between this coupling connection establishment client 40 and server 30 to be connected.
TCP link information in TCP connection table 60 has use status indicator " idle " or " use ", " empty
Not busy " this TCP of state representation connects currently without being used, may be used for carrying out new data transmission." use "
This TCP of state representation connection is currently used, it is impossible to carry out new data transmission.
Further, Mac address and/or the IP address that can use SDN switch in TCP connection table 60 are made
Identify for SDN switch 20.TCP connection table 60 comprises server 30 in the TCP link information of record
IP address, the currently used state that connects of the free time of TCP link information and TCP.
For technical scheme is expanded on further, it is proposed that second embodiment of the invention.In conjunction with Fig. 4, figure
Shown in 5, SDN controller is provided with the free time reference value that TCP connects, when in TCP connection table, TCP connects
Connect free time of information more than reference value time, then be judged to that TCP connects idle time-out.
Second embodiment of the invention comprises the steps.
Step S2, SDN switch 20 reports the Mac address of self, IP address etc. to SDN controller 10
Private information.
Step S3, client 40 sends to SDN switch 20 and sets up, with server 30, the request that TCP is connected.
Step S4, the request message information that SDN switch 20 analysis receives, inquiry stream table, and from stream table
Middle acquisition forwards rule.
Step S5, inquires about TCP connection table 60, according to the connection of keyword search coupling.
Step S6, it is judged that the use state of the connection of coupling.
Step S7, when the use state that coupling connects is " idle ", SDN controller uses this coupling even
Meet the TCP set up between client 40 with server 30 to be connected.
Further, second embodiment of the invention can also include step S41, S42.
Step S41, in step s 4 during SDN switch 20 inquiry stream table, if without coupling route in stream table
Information, the request message of client 40 is reported SDN controller 10, SDN controller 10 by SDN switch 20
After analyzing the request message of client 40, newly-increased forwarding rule.
Step S42, the stream table after SDN controller 10 will update issues SDN switch 20, SDN switch
20 obtain forwarding rule from stream table.
Further, second embodiment of the invention inquires about TCP at SDN controller according to client request message
After connection table, also include step S8, S9, S10.
Step S8, when in step S5 inquire about TCP connection table 60 without coupling connection time；Or in step S6
When the use state that coupling connects is " use ", SDN controller 10 initiates to set up new TCP to server 30
Connection request.
Step S9, SDN controller 10 uses this TCP to be newly connected as between client 40 and server 30
Set up TCP to connect.
Step S10, SDN controller 10 increases the new link information of this TCP in TCP connection table 60, and will
Use state is set to " use ".
Further, shown in Fig. 6, in step S2, SDN switch 20 uses expansible message
Experimenter reports SDN switch private information to SDN controller 10.Experimenter message
Version, Type, Length, Transaction Id field be the unified and standard field of SDN, tool is real
Arrange；The Experimenter field of Experimenter message is set to 255, and numerical value 255 needs to opening
Put the application of network foundation (Open Networking Foundation, ONF) tissue.Experimenter Type
Field is set to 1, represents by SDN switch 20 to SDN controller 10 reported data.Experimenter
The privately owned field of message 50 for storing the private information of SDN switch 20, containing Mac address, IP address,
The identification informations such as Port Id.
Further, before step S5 inquires about TCP connection table 60, first on inquiry SDN controller 10 it is
No have TCP connection table 60, if it does not exist, then create TCP connection table 60.
Further, in step S5 inquire about TCP connection table 60 time, use server 30 IP address and/
Or Port Id is as key word of the inquiry, searches the TCP link information of coupling.
Shown in Fig. 7, Fig. 8, second embodiment of the invention can also comprise the steps.
Step S13, between client 40 and server 30 after DTD, client 40 sends TCP
Connection closed request message, SDN controller 10 resolves TCP connection closed request message.
Step S14, the TCP that SDN controller 10 cuts out between client 40 with SDN switch 20 is connected,
The TCP retained between SDN switch 20 and server 30 is connected.
Step S15, in TCP connection table 60, SDN switch 20 and the service that will retain in step S14
TCP between device 30 connects use state and changes to " idle ".Optionally, can be according to keyword at TCP
TCP between the SDN switch 20 and the server 30 that retain in query steps S14 in connection table 60 is connected,
This TCP link information use state is changed to " idle ".
Further, the present embodiment can also include that TCP connects aging delete step.According to SDN controller
The free time reference value that the TCP arranged connects, it is judged that the TCP of " idle " state in TCP connection table 60
Link information is the most overtime, if overtime, closes the TCP between SDN switch 20 and server 30 even
Connect, the coupling TCP link information in TCP connection table is deleted simultaneously.
Above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto,
Any change expected without creative work or replacement, all should contain within protection scope of the present invention.
Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims are limited.
Claims (10)
1. a TCP connection multiplexing method based on SDN, it is characterised in that: in described SDN
In, there is a TCP between a SDN switch with a server and be connected, use shape when described TCP connects
State is idle, and a client is initiated to set up TCP between described server to described SDN switch simultaneously
The request connected, idle TCP connects described in the most described SDN controller multiplexing, this TCP connection multiplexing
Method includes step:
After described client sends and sets up, with described server, the request message that TCP is connected, described SDN controls
Device inquiry is arranged at the TCP connection table on described SDN controller, and described TCP connection table comprises some
Described TCP link information；
Obtain coupling TCP inquired to connect；
The TCP between client with described server is used described in described coupling TCP connection establishment to be connected.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, described TCP connection table comprises mark IP address and/or the Mac address of SDN switch.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, in described TCP connection table, the described TCP link information of record is including at least the IP ground of described server
The currently used state that location, the free time of described TCP connection and described TCP connect.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, described SDN controller is provided with the free time reference value that TCP connects, when described TCP connection table
Described in TCP link information free time more than described reference value time, described SDN controller perform one
TCP connects aging deletion action.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, also include the described SDN switch step to described SDN its private information of controller report, described
Private information identification information Han SDN switch.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, described SDN switch use expansible message Experimenter to described SDN controller report its
Private information, the Experimenter field of Experimenter message is set to 255, Experimenter
The type field is set to 1, the Experimenter message privately owned field storage privately owned letter of described SDN switch
Breath.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, when described TCP connection table is inquired about the TCP connection of described coupling, use the IP ground of described server
Location and/or Port Id are as key word of the inquiry.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, further comprise the steps of:
Between described client and described server after DTD, described SDN controller retains described SDN
TCP between switch with described server is connected；
In described TCP connection table, the TCP connection state of described reservation is labeled as the free time.
A kind of TCP connection multiplexing method based on SDN, its feature exists
In, also include TCP connect aging delete step:
Judge in described TCP connection table that the connection free time of each TCP link information is the most overtime；
If overtime, the overtime TCP closed between described SDN switch with described server is connected；
Described time-out TCP in described TCP connection table is connected and deletes.
10. a TCP method of attachment based on SDN, it is characterised in that at described SDN controller root
After TCP connection table described in the TCP connection request information query that described client sends, if described
The TCP that there is described coupling in TCP connection table connects, and the TCP of described coupling connects the free time, then make
By a kind of TCP connection multiplexing method based on SDN, described in multiplexing
The TCP joined connects；If the TCP that there is not described coupling in described TCP connection table connects, or institute
The TCP connection stating coupling is presently using, execution following steps:
Described SDN controller is set up new TCP and is connected；
Described SDN controller uses described new TCP to be connected as between described client and described server setting up TCP
Connect
Described SDN controller increases described new TCP in described TCP connection table and connects, and state is set to
In using.
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| CN109327511A (en) * | 2018-09-18 | 2019-02-12 | 网宿科技股份有限公司 | A kind of data request method and server based on http protocol |
| CN110063050A (en) * | 2016-12-16 | 2019-07-26 | 华为技术有限公司 | A kind of business scheduling method and system |
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| CN110063050A (en) * | 2016-12-16 | 2019-07-26 | 华为技术有限公司 | A kind of business scheduling method and system |
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Application publication date: 20161012 |