CN105337857A - Multi-path transmission method based on software-defined network - Google Patents
Multi-path transmission method based on software-defined network Download PDFInfo
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- CN105337857A CN105337857A CN201510818810.2A CN201510818810A CN105337857A CN 105337857 A CN105337857 A CN 105337857A CN 201510818810 A CN201510818810 A CN 201510818810A CN 105337857 A CN105337857 A CN 105337857A
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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
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/124—Shortest path evaluation using a combination of metrics
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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
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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
- H04L45/42—Centralised routing
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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
- H04L45/54—Organization of routing tables
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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
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
Abstract
The invention relates to a multi-path transmission method based on a software-defined network. The method comprises the following steps: a host A and a host B inform the opposite side and a software-defined network SDN controller of respective additional network card address information in a manner of repeatedly responding to a Dupack message, and the SDN controller calculates independent paths between the host A and the host B and selects a most suitable independent path P from the independent paths; the SDN controller generates a flow table of the independent path P and issues the flow table to a related openflow protocol switch on the independent path P; and the host A and the host B establish a subflow on the independent path P to carry out data transmission, and the host A delivers a data packet to multiple independent paths established with the host B. The method establishes an optimal path for both communication sides, thus realizing multi-path optimal data transmission in SDN.
Description
Technical field
The present invention relates to a kind of multi-path transmission method based on software defined network, belong to areas of information technology, particularly belong to software defined network technical field.
Background technology
Software defined network (SoftwareDefinedNetworking, SDN) be a centrally controlled network, multiple network node is unified control by SDN controller, network equipment information, net control equipment can be obtained relatively easily, a unified network view is presented to application/client, wherein there is switch, router, virtual machine, storage, virtual subnet and the virtual gateway for communicating between virtual subnet, user can according to the routing rule between the IP address of the network planning configure virtual machine of oneself, configuration subnet and subnet.The open customization of SDN and centralized control characteristic, to some extent solve the problem that internet ossifys, impart the ability of the subscriber customized network system and procotol, user according to the requirement developing of oneself, the application drawn oneself up and hardware platform, independent and flexible can build private network to a certain extent.
MPTCP be the MPTCP working group of IETF to the expansion of conventional TCP, with the addition of MPTCP layer, original TCP layer becomes multiple subflow layer, and the corresponding IP layer of each subflow layer, and namely each subflow can be considered as a TCP and connects.MPTCP makes user can set up corresponding connection on incoherent path, and carries out transfer of data in the mode of independent subflow on these paths.
How the Dominant Facies of software defined network SDN and MPTCP is combined, become for user provides multi-path data to transmit on SDN the technical barrier being badly in need of solving in current software defined network field.
Summary of the invention
In view of this, the object of the invention is to invent a kind of method, realize the multi-path data transmission between subscriber's main station based on software defined network SDN.In order to achieve the above object, the present invention proposes a kind of multi-path transmission method based on software defined network, described method comprises following operative step:
(1) controller of software defined network SDN obtained by regular active probe described in the bandwidth of the topology diagram of software defined network, the time delay of every bar link and every bar link;
(2) host A and host B are by described software defined network under the control of SDN controller, adopt the mode of MPTCP agreement three-way handshake to set up main connection, i.e. First Contact Connections;
(3) host A and host B are by sending the mode of duplicate answer Dupack message, inform the additional NIC address information of the other side and SDN controller oneself, and described duplicate answer Dupack message comprises interpolation address option MP_Addaddress;
(4) the SDN controller described in calculates the independent pathway between host A and host B, N*M*num_flows bar independent pathway can be calculated at most between host A and host B, wherein N is the network interface card number of host A, M is the network interface card number of host B, and num_flows is the sub-connection number that between set often pair of network interface card, most multipotency is set up; The independent pathway of front L bar optimum selected by described SDN controller, and informs host A, and notification comprises the linking number between host A and host B often pair network interface card; L be greater than 1 natural number;
(5) host A contains the SYN message SYN of MP_Join option to host B transmission L bar according to the information be apprised of;
(6) the stream table mismatch of the access side openflow protocol switch A of the SYN message described in and host A, so this openflow protocol switch A is by Packet_in message, sends to the controller of described software defined network SDN by this SYN message;
(7) after the SDN controller described in receives this Packet_in message, parse described SYN message, from described L bar independent pathway, the independent pathway P corresponding with described network interface card information is selected according to the network interface card information in SYN message, generate the stream table of this independent pathway P, and openflow protocol switch relevant on this independent pathway P issues stream table;
(8) host A and host B set up sub-connection and subflow carries out transfer of data on described independent pathway P; Within the time cycle of setting, if openflow protocol switch relevant on this independent pathway P does not have transfer of data on the stream list item corresponding to this independent pathway P, then this stream list item is deleted, and this stream list item deletion event is informed described SDN controller; All openflow protocol switch relevant on described independent pathway P are after the stream list item corresponding to this independent pathway P is all deleted, and described independent pathway P deletes by described SDN controller;
(9) host A is according to the data packet dispatching principle of setting, packet delivery on many independent pathways set up with host B; The data packet dispatching principle of described setting be the data that make to send on the whole fastest to reaching receiving terminal, i.e. host B.
In described step (4), the particular content of the independent pathway that SDN controller calculates between host A and host B is:
After described SDN controller gets the IP address information of all additional network interface card of host A and host B, determine that the access top-cross of described additional network interface card is changed planes according to this address information; Described switch marks out by SDN controller in the topology diagram of the SDN described in obtaining, the source point representing transmitting terminal is added in described topology diagram, add the meeting point representing receiving terminal, then add between the access top-cross of all network interface cards of source point and transmitting terminal is changed planes and connect, adding between the access top-cross of all network interface cards of meeting point and receiving terminal is changed planes equally and connect, so just obtaining the path computing structure chart for calculating the incoherent independent pathway of link;
Transmitting terminal and receiving terminal all have multiple network interface cards, be equivalent to the superposition of multiple 0-1 flow problem, according to foregoing path computing structure chart, if in source point-switch-link by flow be Q, in same meeting point-switch-link by flow be also Q, wherein Q is the integer much larger than 1, if in switch-switch link by flow be 1, so the host A described in calculating and the incoherent path of link between host B have just been simplified to non-directed graph maximum flow problem, solve by Dinic algorithm.
The concrete form of the stream table of the independent pathway P that the SDN controller described in described step (7) generates is as follows:
Stream table is divided into level Four, every one-level stream table is made up of many stream list items, each stream list item is one hexa-atomic group, is namely made up of six fields, respectively: matching domain field, precedence field, counter Counter field, instruction field, timer timeout field and Cookies field;
Wherein, matching domain field is mainly used to coupling bag, formed by the incorporating aspects in ethernet type, IP protocol number, IPv4 source address, IPv4 destination address, tcp source port and TCP destination interface six parameters, be specially: the matching domain field of first order stream table is made up of ethernet type and IPv4 source address, the matching domain field of second level stream table is made up of ethernet type and IPv4 destination address, the matching domain field of third level stream table is made up of IP protocol number and TCP destination interface, and the matching domain field of fourth stage stream table is made up of IP protocol number and tcp source port;
Precedence field defines the priority of every bar stream list item, the stream list item priority match bag that priority is high;
Counter Counter field is mainly used to the number of adding up the packet that this stream list item mated;
Instruction field is divided into goto and output two kinds of instruction types, and goto instruction type is used for the first order, the second level and third level stream table, and be used to refer to next stage stream table, output instruction type is used for fourth stage stream table, is used to specify the switch ports themselves of output;
Timer timeout field is divided into idle_timeout and hard_timeout two kinds of timer types, and how long afterwards the idle_timeout timer type stated free time inefficacy of this stream list item, and hard_timeout timer specifies to flow the total residence time of list item;
Cookie field mainly can allow controller distinguish not homogeneous turbulence list item;
Second level stream table tableA represents, third level stream table tableB represents, fourth stage stream table tableC represents;
First order stream table has and only has one, is responsible for Match IP v4 source address, realizes the differentiation to sending network interface card, and the number of its stream list item equals the network interface card total number of communicating pair use; The value of its instruction goto field is tableA, i.e. second level stream table;
Matching domain IPv4 destination address is responsible for by second level stream table, achieves a butt joint and receives the differentiation of network interface card, and its number flowing list item equals the network interface card total number that communicating pair uses, and the value of its instruction goto field is tableB, i.e. third level stream table;
Coupling TCP destination interface is responsible for by third level stream table, and the value of its instruction goto field is tableC, i.e. fourth stage stream table;
Fourth stage stream table is responsible for mating tcp source port, and the value of its instruction output field is the port numbers in respective switch.
The particular content of described step (7) comprises following operator step:
(71) the SDN controller described in parses SYN message from the Packet_in message received, therefrom extract source IP address and object IP address, the network interface card information be connected with the MPTCP of current maintenance is mated, if the match is successful, then go to step (72), otherwise common path selection is carried out to it, is it and selects a best paths, carry out single path transmission;
(72) the SDN controller described in is according to source IP address and object IP address, judge the path whether can laid in addition in the independent pathway of the L bar optimum calculated at it, then do not stop, have from Packet_in message, then extract stream table number table_id, and judge it is the information which grade stream table is submitted to according to this stream table number table_id, if the information that first order stream table is submitted to then goes to step (73), if the information that second level stream table is submitted to then goes to step (74), if the information that third level stream table is submitted to then goes to step (75), if the information that fourth stage stream table is submitted to then goes to step (76), described stream table number table_id refers to the concrete numbering of second level stream table tableA, third level stream table tableB and fourth stage stream table tableC,
(73) the SDN controller described in produces the stream table number table_id of new second and third, level Four stream table, records; Then issue the stream list item pointing to new second level stream table to the first order stream table of described submission information, and issue stream list item to new second and third, level Four stream table, go to step (77);
(74) the SDN controller described in produces the stream table number table_id of third and fourth grade of new stream table, records; Then the second level stream table to described submission information issues the stream list item pointing to new third level stream table, and issues stream list item to third and fourth grade of new stream table, goes to step (77);
(75) the SDN controller described in produces the stream table number table_id of new fourth stage stream table, records; Then the third level stream table to described submission information issues the stream list item pointing to new fourth stage stream table, and issues stream list item to new fourth stage stream table, goes to step (77);
(76) the SDN controller described in issues stream list item to the fourth stage stream table of described submission information, goes to step (77);
(77) the openflow protocol switch that the SDN described in is relevant on described independent pathway P issues the stream list item carrying out forwarding.
In described step (8), the process of openflow protocol switch deletion stream list item is as follows: when the timer timeout field of described stream list item exceedes certain hour, if do not have packet to flow through this stream list item, then this stream list item can be automatically left out.
Beneficial effect of the present invention is: after getting the network interface card ip information of network edge side main frame, the information such as the full topology information getting whole network and the real-time bandwidth time delay getting each link in whole network, SDN controller more fully can perceive the service condition of whole network, multi-path transmission protocol is applied based on this in SDN environment, for communicating pair sets up optimum path, achieve the transmission of communicating pair multipath optimal data.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of multi-path transmission method based on software defined network that the present invention proposes.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
See Fig. 1, introduce a kind of multi-path transmission method based on software defined network that the present invention proposes, described method comprises following operative step:
(1) controller of software defined network SDN obtained by regular active probe described in the bandwidth of the topology diagram of software defined network, the time delay of every bar link and every bar link;
The concrete detection method of step (1) can see another part Chinese invention patent application of present invention applicant, and denomination of invention is: a kind of method of the detection of the network information for software defined network SDN;
(2) host A and host B are by described software defined network under the control of SDN controller, adopt the mode of MPTCP agreement three-way handshake to set up main connection, i.e. First Contact Connections;
(3) host A and host B are by sending the mode of duplicate answer Dupack message, inform the additional NIC address information of the other side and SDN controller oneself, and described duplicate answer Dupack message comprises interpolation address option MP_Addaddress;
The concrete operation method of step (3) can see another part Chinese invention patent application of present invention applicant, and denomination of invention is: a kind of host network card IP address acquiring method based on software defined network;
(4) the SDN controller described in calculates the independent pathway between host A and host B, N*M*num_flows bar independent pathway can be calculated at most between host A and host B, wherein N is the network interface card number of host A, M is the network interface card number of host B, and num_flows is the sub-connection number that between set often pair of network interface card, most multipotency is set up; The independent pathway of front L bar optimum selected by described SDN controller, and informs host A, and notification comprises the linking number between host A and host B often pair network interface card; L be greater than 1 natural number;
Such as: establish N=2, M=3, num_flows=5, then can calculate at most 2*3*5=30 bar independent pathway between host A and host B, if setting L=10, then front 10 optimum independent pathways selected by described SDN controller, and inform host A.
(5) host A contains the SYN message of MP_Join option to host B transmission L bar according to the information be apprised of;
(6) the stream table mismatch of the access side openflow protocol switch A of the SYN message described in and host A, so this openflow protocol switch A is by Packet_in message, sends to the controller of described software defined network SDN by this SYN message;
(7) after the SDN controller described in receives this Packet_in message, parse described SYN message, from described L bar independent pathway, the independent pathway P corresponding with described network interface card information is selected according to the network interface card information in SYN message, generate the stream table of this independent pathway P, and openflow protocol switch relevant on this independent pathway P issues stream table;
(8) host A and host B set up sub-connection and subflow carries out transfer of data on described independent pathway P; Within the time cycle of setting, if openflow protocol switch relevant on this independent pathway P does not have transfer of data on the stream list item corresponding to this independent pathway P, then this stream list item is deleted, and this stream list item deletion event is informed described SDN controller; All openflow protocol switch relevant on described independent pathway P are after the stream list item corresponding to this independent pathway P is all deleted, and described independent pathway P deletes by described SDN controller;
(9) host A is according to the data packet dispatching principle of setting, packet delivery on many independent pathways set up with host B; The data packet dispatching principle of described setting be the data that make to send on the whole fastest to reaching receiving terminal, i.e. host B.
In described step (4), the particular content of the independent pathway that SDN controller calculates between host A and host B is:
After described SDN controller gets the IP address information of all additional network interface card of host A and host B, determine that the access top-cross of described additional network interface card is changed planes according to this address information; Described switch marks out by SDN controller in the topology diagram of the SDN described in obtaining, the source point representing transmitting terminal is added in described topology diagram, add the meeting point representing receiving terminal, then add between the access top-cross of all network interface cards of source point and transmitting terminal is changed planes and connect, adding between the access top-cross of all network interface cards of meeting point and receiving terminal is changed planes equally and connect, so just obtaining the path computing structure chart for calculating the incoherent independent pathway of link;
Transmitting terminal and receiving terminal all have multiple network interface cards, be equivalent to the superposition (" 0-1 flow problem " refers to https: //en.wikipedia.org/wiki/Knapsack_problem) of multiple 0-1 flow problem, according to foregoing path computing structure chart, if in source point-switch-link by flow be Q, in same meeting point-switch-link by flow be also Q, wherein Q is the integer (such as Q=100M) much larger than 1, if in switch-switch link by flow be 1, so the host A described in calculating and the incoherent path of link between host B have just been simplified to non-directed graph maximum flow problem, undertaken solving (" Dinic algorithm " refers to https: //en.wikipedia.org/wiki/Dinic%27s_algorithm) by Dinic algorithm.
The concrete form of the stream table of the independent pathway P that the SDN controller described in described step (7) generates is as follows:
Stream table is divided into level Four, every one-level stream table is made up of many stream list items, each stream list item is one hexa-atomic group, is namely made up of six fields, respectively: matching domain field, precedence field, counter Counter field, instruction field, timer timeout field and Cookies field;
Wherein, matching domain field is mainly used to coupling bag, formed by the incorporating aspects in ethernet type, IP protocol number, IPv4 source address, IPv4 destination address, tcp source port and TCP destination interface six parameters, be specially: the matching domain field of first order stream table is made up of ethernet type and IPv4 source address, the matching domain field of second level stream table is made up of ethernet type and IPv4 destination address, the matching domain field of third level stream table is made up of IP protocol number and TCP destination interface, and the matching domain field of fourth stage stream table is made up of IP protocol number and tcp source port;
Precedence field defines the priority of every bar stream list item, the stream list item priority match bag that priority is high;
Counter Counter field is mainly used to the number of adding up the packet that this stream list item mated;
Instruction field is divided into goto and output two kinds of instruction types, and goto instruction type is used for the first order, the second level and third level stream table, and be used to refer to next stage stream table, output instruction type is used for fourth stage stream table, is used to specify the switch ports themselves of output;
Timer timeout field is divided into idle_timeout and hard_timeout two kinds of timer types, and how long afterwards the idle_timeout timer type stated free time inefficacy of this stream list item, and hard_timeout timer specifies to flow the total residence time of list item;
Cookie field mainly can allow controller distinguish not homogeneous turbulence list item;
Second level stream table tableA represents, third level stream table tableB represents, fourth stage stream table tableC represents;
First order stream table has and only has one, is responsible for Match IP v4 source address, realizes the differentiation to sending network interface card, and the number of its stream list item equals the network interface card total number of communicating pair use; The value of its instruction goto field is tableA, i.e. second level stream table;
Matching domain IPv4 destination address is responsible for by second level stream table, achieves a butt joint and receives the differentiation of network interface card, and its number flowing list item equals the network interface card total number that communicating pair uses, and the value of its instruction goto field is tableB, i.e. third level stream table;
Coupling TCP destination interface is responsible for by third level stream table, and the value of its instruction goto field is tableC, i.e. fourth stage stream table;
Fourth stage stream table is responsible for mating tcp source port, and the value of its instruction output field is the port numbers in respective switch.
Be exemplified below:
(source IP address is 10.0.0.1 such as to there is a path being based upon between main frame 10.0.0.1 and main frame 10.0.0.2, source port number is 49407, object IP address is 10.0.0.2, destination slogan is 5001, ethernet type is 0x0800), then corresponding stream list items at different levels are as follows:
One-level stream list item is:
Matching domain field (ethernet type 0x0800, IPv4 source address 10.0.0.1)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableA)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Secondary streams list item (in stream table tableA) is:
Matching domain field (ethernet type 0x0800, IPv4 destination address 10.0.0.2)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableB)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Three grades of stream list items (in stream table tableB) are:
Matching domain (IP protocol number 6, TCP destination interface 5001)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableC)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Level Four stream list item (in stream table tableC) is:
Matching domain (IP protocol number 6, tcp source port 49407)
Precedence field (optional)
Counter Counter field
Instruction output field (n, n are the port numbers on concrete openflow switch)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
The particular content of described step (7) comprises following operator step:
(71) the SDN controller described in parses SYN message from the Packet_in message received, therefrom extract source IP address and object IP address, the network interface card information be connected with the MPTCP of current maintenance is mated, if the match is successful, then go to step (72), otherwise common path selection is carried out to it, is it and selects a best paths, carry out single path transmission;
(72) the SDN controller described in is according to source IP address and object IP address, judge the path whether can laid in addition in the independent pathway of the L bar optimum calculated at it, then do not stop, have from Packet_in message, then extract stream table number table_id, and judge it is the information which grade stream table is submitted to according to this stream table number table_id, if the information that first order stream table is submitted to then goes to step (73), if the information that second level stream table is submitted to then goes to step (74), if the information that third level stream table is submitted to then goes to step (75), if the information that fourth stage stream table is submitted to then goes to step (76), described stream table number table_id refers to the concrete numbering of secondary streams table tableA, three grades of stream table tableB and level Four stream table tableC,
(73) the SDN controller described in produces the stream table number table_id of new second and third, level Four stream table, records; Then issue the stream list item pointing to new second level stream table to the first order stream table of described submission information, and issue stream list item to new second and third, level Four stream table, go to step (77);
Be exemplified below:
Such as: the path that will set up is the new network interface card enabling source, and source IP address can not match with the stream list item in first order stream table; Specific as follows: a path be based upon between 10.0.1.1 and 10.0.0.2, source IP address is 10.0.1.1, and source port number is 48357, object IP addresses is 10.0.0.2, and destination slogan is 5001; Then corresponding stream list items at different levels are as follows:
One-level stream list item is:
Matching domain field (ethernet type 0x0800, IPv4 source address 10.0.1.1)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableA1, tableA1 represent the concrete stream table number table_id of pointed second level stream table)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Secondary streams list item (in stream table tableA1) is:
Matching domain field (ethernet type 0x0800, IPv4 destination address 10.0.0.2)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableB1, tableB1 represent the concrete stream table number table_id of pointed third level stream table)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Three grades of stream list items (in stream table tableB1) are:
Matching domain (IP protocol number 6, TCP destination interface 5001)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableC1, tableC1 represent the concrete stream table number table_id of pointed fourth stage stream table)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Level Four stream list item (in stream table tableC1) is:
Matching domain (IP protocol number 6, tcp source port 48357)
Precedence field (optional)
Counter Counter field
Instruction output field (n, n are the port numbers on concrete openflow switch)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
(74) the SDN controller described in produces the stream table number table_id of third and fourth grade of new stream table, records; Then the second level stream table to described submission information issues the stream list item pointing to new third level stream table, and issues stream list item to third and fourth grade of new stream table, goes to step (77);
Be exemplified below:
Such as: the path that will set up is the new network interface card enabling destination, and destination IP address can not match with the stream list item in the stream table of the second level; Specific as follows: a path be based upon between 10.0.0.1 and 10.0.1.2, source IP address is 10.0.0.1, and source port number is 47296, object IP addresses is 10.0.1.2, and destination slogan is 5001; Then corresponding stream list item at different levels is as follows:
Secondary streams list item is:
Matching domain field (ethernet type 0x0800, IPv4 destination address 10.0.1.2)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableB2, tableB2 represent the concrete stream table number table_id of pointed third level stream table)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Three grades of stream list items (in stream table tableB2) are:
Matching domain (IP protocol number 6, TCP destination interface 5001)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableC2, tableC2 represent the concrete stream table number table_id of pointed fourth stage stream table)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Level Four stream list item (in stream table tableC2) is:
Matching domain (IP protocol number 6, tcp source port 47296)
Precedence field (optional)
Counter Counter field
Instruction output field (n, n are the port numbers on concrete openflow switch)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
(75) the SDN controller described in produces the stream table number table_id of new fourth stage stream table, records; Then the third level stream table to described submission information issues the stream list item pointing to new fourth stage stream table, and issues stream list item to new fourth stage stream table, goes to step (77);
Be exemplified below:
Such as: the path that will set up is a pair new business of having enabled between network interface card, TCP destination interface can not match with the stream list item in third level stream table; Specific as follows: a path be based upon between 10.0.0.1 and 10.0.0.2, source IP address is 10.0.0.1, and source port number is 43728, object IP addresses is 10.0.0.2, and destination slogan is 45378; Then corresponding stream list item at different levels is as follows:
Three grades of stream list items are:
Matching domain (IP protocol number 6, TCP destination interface 45378)
Precedence field (optional)
Counter Counter field
Instruction goto field (gototableC3, tableC3 represent the concrete stream table number table_id of pointed fourth stage stream table)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
Level Four stream list item (in stream table tableC3) is:
Matching domain (IP protocol number 6, tcp source port 43728);
Precedence field (optional)
Counter Counter field
Instruction output field (n, n are the port numbers on concrete openflow switch)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
(76) the SDN controller described in issues stream list item to the fourth stage stream table of described submission information, goes to step (77);
Be exemplified below:
Such as: the new connection between network interface card has been enabled in the path that will set up for a pair, tcp source port can not match with the stream list item in fourth stage stream table; Instantiation is as follows: a path be based upon between 0.0.0.1 and 10.0.0.2, and source IP address is 10.0.0.1, and source port number is 45396, object IP addresses is 10.0.0.2, and destination slogan is 5001; Then corresponding level Four stream list item is: matching domain (IP protocol number 6, tcp source port 45396), outputn (n is the port numbers on concrete openflow switch);
Level Four stream list item is:
Matching domain (IP protocol number 6, tcp source port 45396)
Precedence field (optional)
Counter Counter field
Instruction output field (n, n are the port numbers on concrete openflow switch)
Timer timeout field (optional, such as idle_timeout=15)
Cookies field (optional)
(77) the openflow protocol switch that the SDN described in is relevant on described independent pathway P issues the stream list item carrying out forwarding.
In described step (8), the process of openflow protocol switch deletion stream list item is as follows: when the timer timeout field of described stream list item exceedes certain hour (such as 15 seconds), if do not have packet to flow through this stream list item, then this stream list item can be automatically left out.
Inventor tests on try net method of the present invention, through a large amount of experiments and emulation, obtains satisfied experimental result, and proved invention is feasible and very effective.
Claims (5)
1. based on a multi-path transmission method for software defined network, it is characterized in that: described method comprises following operative step:
(1) controller of software defined network SDN obtained by regular active probe described in the bandwidth of the topology diagram of software defined network, the time delay of every bar link and every bar link;
(2) host A and host B are by described software defined network under the control of SDN controller, adopt the mode of MPTCP agreement three-way handshake to set up main connection, i.e. First Contact Connections;
(3) host A and host B are by sending the mode of duplicate answer Dupack message, inform the additional NIC address information of the other side and SDN controller oneself, and described duplicate answer Dupack message comprises interpolation address option MP_Addaddress;
(4) the SDN controller described in calculates the independent pathway between host A and host B, N*M*num_flows bar independent pathway can be calculated at most between host A and host B, wherein N is the network interface card number of host A, M is the network interface card number of host B, and num_flows is the sub-connection number that between set often pair of network interface card, most multipotency is set up; The independent pathway of front L bar optimum selected by described SDN controller, and informs host A, and notification comprises the linking number between host A and host B often pair network interface card; L be greater than 1 natural number;
(5) host A contains the SYN message of MP_Join option to host B transmission L bar according to the information be apprised of;
(6) the stream table mismatch of the access side openflow protocol switch A of the SYN message described in and host A, so this openflow protocol switch A is by Packet_in message, sends to the controller of described software defined network SDN by this SYN message;
(7) after the SDN controller described in receives this Packet_in message, parse described SYN message, from described L bar independent pathway, the independent pathway P corresponding with described network interface card information is selected according to the network interface card information in SYN message, generate the stream table of this independent pathway P, and openflow protocol switch relevant on this independent pathway P issues stream table;
(8) host A and host B set up sub-connection and subflow carries out transfer of data on described independent pathway P; Within the time cycle of setting, if openflow protocol switch relevant on this independent pathway P does not have transfer of data on the stream list item corresponding to this independent pathway P, then this stream list item is deleted, and this stream list item deletion event is informed described SDN controller; All openflow protocol switch relevant on described independent pathway P are after the stream list item corresponding to this independent pathway P is all deleted, and described independent pathway P deletes by described SDN controller;
(9) host A is according to the data packet dispatching principle of setting, packet delivery on many independent pathways set up with host B; The data packet dispatching principle of described setting be the data that make to send on the whole fastest to reaching receiving terminal, i.e. host B.
2. a kind of multi-path transmission method based on software defined network according to claim 1, is characterized in that: in described step (4), the particular content of the independent pathway that SDN controller calculates between host A and host B is:
After described SDN controller gets the IP address information of all additional network interface card of host A and host B, determine that the access top-cross of described additional network interface card is changed planes according to this address information; Described switch marks out by SDN controller in the topology diagram of the SDN described in obtaining, the source point representing transmitting terminal is added in described topology diagram, add the meeting point representing receiving terminal, then add between the access top-cross of all network interface cards of source point and transmitting terminal is changed planes and connect, adding between the access top-cross of all network interface cards of meeting point and receiving terminal is changed planes equally and connect, so just obtaining the path computing structure chart for calculating the incoherent independent pathway of link;
Transmitting terminal and receiving terminal all have multiple network interface cards, be equivalent to the superposition of multiple 0-1 flow problem, according to foregoing path computing structure chart, if in source point-switch-link by flow be Q, in same meeting point-switch-link by flow be also Q, wherein Q is the integer much larger than 1, if in switch-switch link by flow be 1, so the host A described in calculating and the incoherent path of link between host B have just been simplified to non-directed graph maximum flow problem, solve by Dinic algorithm.
3. a kind of multi-path transmission method based on software defined network according to claim 1, is characterized in that: the concrete form of the stream table of the independent pathway P that the SDN controller described in described step (7) generates is as follows:
Stream table is divided into level Four, every one-level stream table is made up of many stream list items, each stream list item is one hexa-atomic group, is namely made up of six fields, respectively: matching domain field, precedence field, counter Counter field, instruction field, timer timeout field and Cookies field;
Wherein, matching domain field is mainly used to coupling bag, formed by the incorporating aspects in ethernet type, IP protocol number, IPv4 source address, IPv4 destination address, tcp source port and TCP destination interface six parameters, be specially: the matching domain field of first order stream table is made up of ethernet type and IPv4 source address, the matching domain field of second level stream table is made up of ethernet type and IPv4 destination address, the matching domain field of third level stream table is made up of IP protocol number and TCP destination interface, and the matching domain field of fourth stage stream table is made up of IP protocol number and tcp source port;
Precedence field defines the priority of every bar stream list item, the stream list item priority match bag that priority is high;
Counter Counter field is mainly used to the number of adding up the packet that this stream list item mated;
Instruction field is divided into goto and output two kinds of instruction types, and goto instruction type is used for the first order, the second level and third level stream table, and be used to refer to next stage stream table, output instruction type is used for fourth stage stream table, is used to specify the switch ports themselves of output;
Timer timeout field is divided into idle_timeout and hard_timeout two kinds of timer types, and how long afterwards the idle_timeout timer type stated free time inefficacy of this stream list item, and hard_timeout timer specifies to flow the total residence time of list item;
Cookie field mainly can allow controller distinguish not homogeneous turbulence list item;
Second level stream table tableA represents, third level stream table tableB represents, fourth stage stream table tableC represents;
First order stream table has and only has one, is responsible for Match IP v4 source address, realizes the differentiation to sending network interface card, and the number of its stream list item equals the network interface card total number of communicating pair use; The value of its instruction goto field is tableA, i.e. second level stream table;
Matching domain IPv4 destination address is responsible for by second level stream table, achieves a butt joint and receives the differentiation of network interface card, and its number flowing list item equals the network interface card total number that communicating pair uses, and the value of its instruction goto field is tableB, i.e. third level stream table;
Coupling TCP destination interface is responsible for by third level stream table, and the value of its instruction goto field is tableC, i.e. fourth stage stream table;
Fourth stage stream table is responsible for mating tcp source port, and the value of its instruction output field is the port numbers in respective switch.
4. a kind of multi-path transmission method based on software defined network according to claim 1, is characterized in that: the particular content of described step (7) comprises following operator step:
(71) the SDN controller described in parses SYN message from the Packet_in message received, therefrom extract source IP address and object IP address, the network interface card information be connected with the MPTCP of current maintenance is mated, if the match is successful, then go to step (72), otherwise common path selection is carried out to it, is it and selects a best paths, carry out single path transmission;
(72) the SDN controller described in is according to source IP address and object IP address, judge the path whether can laid in addition in the independent pathway of the L bar optimum calculated at it, then do not stop, have from Packet_in message, then extract stream table number table_id, and judge it is the information which grade stream table is submitted to according to this stream table number table_id, if the information that first order stream table is submitted to then goes to step (73), if the information that second level stream table is submitted to then goes to step (74), if the information that third level stream table is submitted to then goes to step (75), if the information that fourth stage stream table is submitted to then goes to step (76), described stream table number table_id refers to the concrete numbering of second level stream table tableA, third level stream table tableB and fourth stage stream table tableC,
(73) the SDN controller described in produces the stream table number table_id of new second and third, level Four stream table, records; Then issue the stream list item pointing to new second level stream table to the first order stream table of described submission information, and issue stream list item to new second and third, level Four stream table, go to step (77);
(74) the SDN controller described in produces the stream table number table_id of third and fourth grade of new stream table, records; Then the second level stream table to described submission information issues the stream list item pointing to new third level stream table, and issues stream list item to third and fourth grade of new stream table, goes to step (77);
(75) the SDN controller described in produces the stream table number table_id of new fourth stage stream table, records; Then the third level stream table to described submission information issues the stream list item pointing to new fourth stage stream table, and issues stream list item to new fourth stage stream table, goes to step (77);
(76) the SDN controller described in issues stream list item to the fourth stage stream table of described submission information, goes to step (77);
(77) the openflow protocol switch that the SDN described in is relevant on described independent pathway P issues the stream list item carrying out forwarding.
5. a kind of multi-path transmission method based on software defined network according to claim 1 or 3, it is characterized in that: in described step (8), the process of openflow protocol switch deletion stream list item is as follows: when the timer timeout field of described stream list item exceedes certain hour, if do not have packet to flow through this stream list item, then this stream list item can be automatically left out.
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