CN109617776A - The method and system of software defined network controller based on distributed hash table - Google Patents
The method and system of software defined network controller based on distributed hash table Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
- H04L49/3009—Header conversion, routing tables or routing tags
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- H—ELECTRICITY
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/104—Peer-to-peer [P2P] networks
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
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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
- H04L67/01—Protocols
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- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
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Abstract
A kind of method and system of the software defined network controller based on distributed hash table, it is related to software defined network and point-to-point communication technical field, the technical issues of solving the problems, such as is: the centralized control bring single point failure of network controller, the method comprising the steps of: establishing loop network；Interchanger sends a request message to some node on looped network, establishes the communication of communication connection control interchanger；It is communicated with each other between node on the ring, when there is node failure, neighbor node searches corresponding controller node, and new controller and interchanger re-establish communication connection.The system includes controller and interchanger, and controller composition ring network and interchanger establish connection, and interchanger sends a request message to some node on looped network, establishes the communication of communication connection control interchanger；It is communicated with each other between node on the ring and finds adapter tube controller.The present invention can flexible networking and switching, solve centralized control bring single point failure, problem of load balancing, have higher stability.
Description
Technical field
The present invention relates to software defined network (Soft Defined Network, SDN) and point-to-point (Peer to
Peer, P2P) field of communication technology more particularly to a kind of method of the software defined network controller based on distributed hash table
And system.
Background technique
In traditional C/S model, the distribution of data uses special server, and multiple client is all obtained from this server
Data.But the shortcomings that such mode, is: because of the number of server only one (even if having multiple also very limited), system
It is easy to appear single point failure；Single server can be same due to the limitation of CPU, memory, network bandwidth in face of numerous clients
When the client that services it is very limited, poor expandability.P2P technology is precisely in order to the one kind for solving these problems and putting forward is right
Etc. network structures.The purpose of the P2P communication technology is that computer different in network links together, and makes full use of in network
Slack resources Anywhere.In P2P network, each node can both be serviced from other nodes, can also be to other
Node provides service.DHT agreement is one of P2P network structure, and each node forms one by DHT algorithm in the agreement
Ring, it may be convenient to switch over, so as to solve the problems, such as the single point failure in centralized control.
SDN technology proposes to provide traditional network and be difficult to look forward to the Forwarding plane and control plane decoupling in the network equipment
And flexibility and agility.There are three features for SDN technology: centralized control, data plane are mutually separated with control plane, be may be programmed
Configuration, it is central controlled precondition that wherein data plane is mutually separated with control plane, and centralized control, which enables, controls plane
Enough obtain network global state information, and then can the real-time status according to network and the demand according to upper layer application, to net
Network resource carries out global scheduling and optimization, facilitates the efficient utilization of Internet resources.However centralized control is also drawn to SDN technology
Entered safety problem, i.e. central controller once by attack or itself break down, cause the data packet of interchanger without
Method is forwarded and is lost, this just needs the handover mechanism of a controller, when failure occurs, is quickly and effectively switched to backup control
Device processed, this needs multi-controller cluster just to solve the hidden danger of the centralized control bring single point failure of this controller.
Summary of the invention
In view of the deficiencies of the prior art, technical problem solved by the invention is how to solve the concentration control of network controller
Bring single point failure problem processed.
In order to solve the above technical problems, the technical solution adopted by the present invention is that a kind of software based on distributed hash table is fixed
The method of adopted network controller, comprising the following steps:
(1) loop network is established, according to the DHT technology in P2P network, root node initiates the request of creation pastry ring,
After other nodes are connected to request, a P2P nerve of a covering can be set up by adhereing to, and the controller on each node passes through nerve of a covering phase
Even, a controller looped network is constituted；
The DHT technology uses pastry Routing Protocol, and one 128 node identifications are distributed for each node
(nodeID), all node identifiers form an annular net, and each node possesses a routing table R, a leaf section
A point set L and neighbor node collection M together forms the state table of node, and routing table R has recorded neighbor node and present node
The identical digit of nodeID prefix, what is stored in leaf node collection L is node ID value and present node apart from L nearest node
Information, what is stored in neighbor node collection M is the information in live network with present node apart from M nearest node.
(2) interchanger sends a request message to some node on looped network, the corresponding controller node of the node checks,
Controller node sends messages to the communication that interchanger establishes communication connection control interchanger, the specific steps are as follows:
(1) interchanger sends a request to some node on looped network, the id information of the Node extraction interchanger, and passes through
SHA-1 algorithm calculates the hashed value of interchanger ID, and the SHA-1 algorithm receives a Duan Mingwen (corresponding to interchanger ID herein), and
It is converted to the output sequence i.e. hashed value that length is shorter, digit is fixed；
Ask the formula of interchanger ID hashed value as follows:
C=f (k, p)
Wherein C represents ciphertext, and for the hashed value acquired, f represents round function, and k represents key, and corresponding is SHA-1 algorithm
Key, p represent in plain text, be interchanger ID；
(2) node judges whether to return this node administration, if it is, carrying out down according to the hashed value of this interchanger ID
One step continues to search if it is not, the ID of interchanger is then forwarded to other nodes, and the node of this hashed value is managed until finding；
(3) request message is transmitted to controller by the node managed, and controller sends handshake information to interchanger, interchanger
Connection is established with controller；
(4) controller sends out ofp_feature_request message to the interchanger for establishing connection, obtains the feature of interchanger
Information, and update network topological diagram；
(5) interchanger receives host and sends data packet, first searches existing flow table rule, does not match flow entry；
(6) data envelope is dressed up packet-in information reporting to the correspondence controller having connected by interchanger, and controller is determined
The processing for determining data packet generates corresponding flow table, and is handed down to interchanger；
(7) interchanger is handled data packet according to flow table rule.
(3) it is communicated with each other between node on the ring, periodically exchanges survival information, once there is node failure, request message
Be automatically forwarded to the neighbor node of failure node, neighbor node searches corresponding controller node, the new controller node with
The connected interchanger of failure node re-establishes communication connection, the specific steps are as follows:
(1) each node according to the routing table of oneself periodically gives other nodes to send alive messages on ring；
(2) it if after some node receives alive message, is replied message in period demand without sending, that is, determines the section
Point failure, starter node handover mechanism；
(3) request of failure node is forwarded to its neighbor node automatically, and neighbor node extracts the interchanger ID in request,
The hashed value of ID is calculated by SHA-1 algorithm；
(4) neighbor node according to the hashed value judges whether that this node is returned to be managed, if it is, entering in next step, such as
Fruit is not that then request message is forwarded to other nodes by routing module and continues to search, and the node of this hashed value is managed until finding；
(5) new management node by the request message received give controller processing, the controller transmission reply message with
The interchanger for sending request establishes connection；
(6) controller sends packet-out message and obtains exchanger information to the interchanger of connection, and updates controller
The network topological diagram of management；
(7) new controller node continues to instruct the communication of the interchanger of failure node.
In order to solve the above technical problems, another technical solution provided by the invention is a kind of based on distributed hash table
The system of software defined network controller, including controller and interchanger, the controller is by DHT protocol groups at ring-like net
Network, the controller include node, and the interchanger sends connection request to some node on looped network, some described section
Point computation requests interchanger ID hashed value, search the value whether this node leaf node concentrate, if belonged to deciding that
Otherwise this node administration is just transmitted to other nodes on ring according to routing table, until finding corresponding management node.The management
The interchanger of controller and sending request on node, which is established, to be communicated to connect, and it is concurrent that the controller of the management node generates flow table
To the interchanger；Alive message is periodically mutually sent out between the node, after detecting failure node, normal node is navigated to
The request of failure node, the interchanger can be automatically by forwarded to adjacent node, and adjacent node calculates the interchanger
ID hashed value judges whether to return this node administration according to the value, if it is, the interchanger to be given to the control of this node
Otherwise device forwards requests on other nodes, continues to search management node, final new until finding corresponding management node
Node Controller re-establish and connect with the connected interchanger of failure node.
Compared with prior art, using technical solution of the present invention the utility model has the advantages that
(1) multiple controllers form a distributed ring network, and controller node can neatly networking and switching.
(2) controller loop network can preferably in solution technology centralized control bring single point failure or load it is equal
The problem of weighing apparatus.
(3) due to that can appoint on amount controller using the controller loop network constructed based on pastry algorithm
Meaning expands, and system will not reduce performance because controller increases, and has higher stability.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention；
Fig. 2 is system structure of the invention schematic diagram；
Fig. 3 is controller handover mechanism schematic diagram of the present invention.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing, but is not to limit of the invention
It is fixed.
Fig. 1 shows a kind of method of software defined network controller based on distributed hash table, comprising the following steps:
(1) loop network is established, according to the DHT technology in P2P network, root node initiates the request of creation pastry ring,
After other nodes are connected to request, a P2P nerve of a covering can be set up by adhereing to, and the SDN controller on each node passes through covering
Net is connected, and constitutes a SDN controller looped network；
The DHT technology uses pastry Routing Protocol, and one 128 node identifications are distributed for each node
(nodeID), all node identifiers form an annular net, and each node possesses a routing table R, a leaf section
A point set L and neighbor node collection M together forms the state table of node, and routing table R has recorded neighbor node and present node
The identical digit of nodeID prefix, what is stored in leaf node collection L is node ID value and present node apart from L nearest node
Information, what is stored in neighbor node collection M is the information in live network with present node apart from M nearest node.
(2) SDN switch sends a request message to some node on looped network, the corresponding SDN controller of the node checks
Node, SDN controller node send messages to the communication that SDN switch establishes communication connection control SDN switch, specific steps
It is as follows:
(1) SDN switch sends a request to some node on looped network, the id information of the Node extraction SDN switch, and
The hashed value of SDN switch ID is calculated by SHA-1 algorithm, the SHA-1 algorithm receives a Duan Mingwen and (corresponds to SDN friendship herein
Change planes ID), and it is converted to the output sequence i.e. hashed value that length is shorter, digit is fixed；
Ask the formula of SDN switch ID hashed value as follows:
C=f (k, p)
Wherein C represents ciphertext, and for the hashed value acquired, f represents round function, and k represents key, and corresponding is SHA-1 algorithm
Key, p represent in plain text, be SDN switch ID.
(2) node judges whether to return this node administration according to the hashed value of this SDN switch ID, if it is, carrying out
In next step, it is continued to search if it is not, the ID of SDN switch is then forwarded to other nodes, manages this hashed value until finding
Node；
(3) request message is transmitted to SDN controller by the node managed, and SDN controller sends handshake information and exchanges to SDN
Machine, SDN switch and SDN controller establish connection；
(4) SDN controller sends out ofp_feature_request message to the SDN switch for establishing connection, obtains SDN and hands over
The characteristic information changed planes, and update network topological diagram；
(5) SDN switch receives host and sends data packet, first searches existing flow table rule, does not match flow entry；
(6) data envelope is dressed up packet-in information reporting to the correspondence SDN controller that has connected by SDN switch,
The processing of SDN controller determination data packet, generates corresponding flow table, and be handed down to SDN switch；
(7) SDN switch is handled data packet according to flow table rule.
(3) it is communicated with each other between node on the ring, periodically exchanges survival information, once there is node failure, request message
It is automatically forwarded to the neighbor node of failure node, neighbor node searches corresponding SDN controller node, the new SDN controller
Node and the connected SDN switch of failure node re-establish communication connection, the specific steps are as follows:
(1) each node according to the routing table of oneself periodically gives other nodes to send alive messages on ring；
(2) it if after some node receives alive message, is replied message in period demand without sending, that is, determines the section
Point failure, starter node handover mechanism；
(3) request of failure node is forwarded to its neighbor node automatically, and neighbor node extracts the SDN switch in request
ID calculates the hashed value of ID by SHA-1 algorithm；
(4) neighbor node according to the hashed value judges whether that this node is returned to be managed, if it is, entering in next step, such as
Fruit is not that then request message is forwarded to other nodes by routing module and continues to search, and the node of this hashed value is managed until finding；
(5) new management node gives the request message received to the processing of SDN controller, which, which sends, replys
Message and the SDN switch for sending request establish connection；
(6) SDN controller sends packet-out message to the SDN switch of connection, obtains SDN switch information, and
Update the network topological diagram of SDN controller management；
(7) new SDN controller node continues to instruct the communication of the SDN switch of failure node.
The system of Fig. 2 shows a kind of software defined network controller based on distributed hash table, including controller and
Interchanger, for the controller by DHT protocol groups at ring network, the controller includes node, and the interchanger is sent
Whether connection request searches the value in this node to some node on looped network, the node computation requests interchanger ID hashed value
Leaf node concentrate, if belonging to this node administration deciding that, other nodes on ring are just otherwise transmitted to according to routing table,
Until finding corresponding management node.The interchanger of controller and sending request in the management node, which is established, to be communicated to connect, control
Device processed generates flow table and issues the interchanger.Alive message is periodically mutually sent out between each node, after detecting failure node,
Normal node navigates to failure node, and the request of the connected interchanger of failure node can be automatically by forwarded to adjacent node, phase
Neighbors calculates the ID hashed value of the interchanger, judges whether to return this node administration according to the value, if it is, by the interchanger
The controller of this node is given, otherwise, forwards requests on other nodes, continues to search management node, until finding correspondence
Management node, final new Node Controller is re-established with the connected interchanger of failure node to be connect.
Fig. 3 shows SDN controller handover mechanism schematic diagram, and five nodes A, B, C, D and root node constitute one
Pastry ring, the SDN controller on A, B, C, D node are connected by P2P network, and each node is all in the node state table of oneself
The information of other nodes is housed, alive message is periodically sent between node to other nodes, whether detection node is normal
Operation, if node does not reply message within the period, is judged as the node failure.
If detecting that node A fails, the request message of node A is forwarded to adjacent node B, node by pastry net automatically
The hashed value of B computation requests SDN switch ID judges whether it is this node administration according to the leaf node collection range of this node,
If so, forwarding a request to node B processing, otherwise, node B, which just forwards the message to the node C on ring according to routing table, to be continued
It searches, node C is not belonging to this node administration according to the judgement of SDN switch ID hashed value, continues to be transmitted to next node D, saves
Point D has found SDN switch ID hashed value within the scope of the leaf node collection of itself, so node D is exactly corresponding new pipe
Node is managed, management node SDN controller and SDN switch send handshake information and establish connection, and SDN controller sends message and obtains
The network information for taking SDN switch updates original topological diagram, and so far, SDN switch is switched to new management from failure node
The process of node is completed.
Compared with prior art, using technical solution of the present invention the utility model has the advantages that
(1) multiple SDN controllers form a distributed ring network, SDN controller node can neatly networking and
Switching.
(2) SDN controller loop network can preferably solve in SDN technology centralized control bring single point failure or
The problem of load balancing.
(3) due to using the SDN controller loop network constructed based on pastry algorithm, on SDN amount controller
Can arbitrarily it expand, system will not reduce performance because SDN controller increases, and have higher stability.
Detailed description is made that embodiments of the present invention in conjunction with attached drawing above, but the present invention be not limited to it is described
Embodiment.To those skilled in the art, without departing from the principles and spirit of the present invention, to these implementations
Mode carries out various change, modification, replacement and variant are still fallen in protection scope of the present invention.
Claims (5)
1. a kind of method of the software defined network controller based on distributed hash table, which comprises the following steps:
(1) loop network is established, according to the DHT technology in P2P network, root node initiates the request of creation pastry ring, other
After node is connected to request, a P2P nerve of a covering can be set up by adhereing to, and the controller on each node is connected by nerve of a covering,
Constitute a controller looped network；
(2) interchanger sends a request message to some node on looped network, the corresponding controller node of the node checks, control
Device node sends messages to the communication that interchanger establishes communication connection control interchanger；
(3) it is communicated with each other between node on the ring, periodically exchanges survival information, once there is node failure, request message is by certainly
Turn is dealt into the neighbor node of failure node, and neighbor node searches corresponding controller node, the new controller node and failure
The connected interchanger of node re-establishes communication connection.
2. the method for the software defined network controller based on distributed hash table as described in claim 1, which is characterized in that
In step (1), the DHT technology uses pastry Routing Protocol, and one 128 node identifications, institute are distributed for each node
Some node identifiers form an annular net, and each node possesses a routing table R, a leaf node collection L and one
Neighbor node collection M together forms the state table of node, and routing table R has recorded neighbor node and present node nodeID prefix phase
Isotopic number, that store in leaf node collection L is the information of node ID value and present node apart from L nearest node, Lin Jujie
What is stored in point set M is the information in live network with present node apart from M nearest node.
3. the method for the software defined network controller based on distributed hash table as described in claim 1, which is characterized in that
Specific step is as follows for step (2):
(1) interchanger sends a request to some node on looped network, the id information of the Node extraction interchanger, and passes through SHA-1
Algorithm calculates the hashed value of interchanger ID, and the SHA-1 algorithm receives a Duan Mingwen, and is converted to that length is shorter, digit is fixed
Output sequence, that is, hashed value；
Ask the formula of interchanger ID hashed value as follows:
C=f (k, p)
Wherein C represents ciphertext, and for the hashed value acquired, f represents round function, and k represents key, and corresponding is the close of SHA-1 algorithm
Key, p are represented in plain text, are interchanger ID；
(2) node judges whether to return this node administration according to the hashed value of this interchanger ID, if it is, carry out in next step,
It is continued to search if it is not, the ID of interchanger is then forwarded to other nodes, the node of this hashed value is managed until finding；
(3) request message is transmitted to controller by the node managed, and controller sends handshake information to interchanger, interchanger and control
Device processed establishes connection；
(4) controller sends out ofp_feature_request message to the interchanger for establishing connection, obtains the feature letter of interchanger
Breath, and update network topological diagram；
(5) interchanger receives host and sends data packet, first searches existing flow table rule, does not match flow entry；
(6) data envelope is dressed up packet-in information reporting to the correspondence controller having connected by interchanger, and controller determines number
According to the processing of packet, corresponding flow table is generated, and is handed down to interchanger；
(7) interchanger is handled data packet according to flow table rule.
4. the method for the software defined network controller based on distributed hash table as described in claim 1, which is characterized in that
Specific step is as follows for step (3):
(1) each node according to the routing table of oneself periodically gives other nodes to send alive messages on ring；
(2) it if after some node receives alive message, is replied message in period demand without sending, that is, determines that the node loses
Effect, starter node handover mechanism；
(3) request of failure node is forwarded to its neighbor node automatically, and neighbor node extracts the interchanger ID in request, passes through
The hashed value of SHA-1 algorithm calculating ID；
(4) neighbor node according to the hashed value judges whether that this node is returned to be managed, if it is, entering in next step, if not
It is that then request message is forwarded to other nodes by routing module and continues to search, the node of this hashed value is managed until finding；
(5) new management node gives the request message received to controller processing, and controller transmission is replied message and sent
The interchanger of request establishes connection；
(6) controller sends packet-out message and obtains exchanger information to the interchanger of connection, and updates controller management
Network topological diagram；
(7) new controller node continues to instruct the communication of the interchanger of failure node.
5. a kind of using the described in any item software defined network controller sides based on distributed hash table of Claims 1-4
The system of method, which is characterized in that including controller and interchanger, the controller by DHT protocol groups at ring network, it is described
Controller includes node, and the interchanger sends connection request to some node on looped network, some described node calculates
Request interchanger ID hashed value, search the value whether this node leaf node concentrate, if belonging to this node deciding that
Management, is otherwise just transmitted to other nodes on ring according to routing table, until finding corresponding management node；In the management node
Controller and issue the interchanger of request and establish and communicate to connect, the controller of the management node generate flow table simultaneously issue it is described
Interchanger；Alive message is periodically mutually sent out between the node, after detecting failure node, normal node navigates to failure section
The request of point, the interchanger can be automatically by forwarded to adjacent node, and adjacent node calculates the ID hash of the interchanger
Value, judges whether to return this node administration according to the value, if it is, the interchanger is given to the controller of this node, otherwise,
It forwards requests on other nodes, continues to search management node, until finding corresponding management node, final new node control
Device processed is re-established with the connected interchanger of failure node and is connect.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115086978A (en) * | 2021-03-11 | 2022-09-20 | 中国移动通信集团四川有限公司 | Network function virtualization SDN network system |
| CN117240900A (en) * | 2023-11-10 | 2023-12-15 | 广东省电信规划设计院有限公司 | Block chain node discovery and networking method and device based on software defined network |
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