CN104363159A - Virtual open network building system and method based on software definition network - Google Patents
Virtual open network building system and method based on software definition network Download PDFInfo
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Abstract
The invention discloses a virtual open network building system based on a software definition network. The virtual open network building system comprises a network topological information detection module, a network performance detection module, a network resource integration module, a network resource display module, a user virtual node selection module, a virtual network management module, a network resource virtualization module, a host unit resource virtualization module and a user interaction interface module. A virtual open network building method based on the software definition network comprises the steps that (1) a user logs into the virtual open network building system; (2) the system collects network resource information and visually displays the information to the user; (3) the user finds resources for specific service and provides a service request; and (4) the system provides virtual network customization service for the user. According to the virtual open network building system and the virtual open network building method, the aim of the user for opening and self-building a virtual network is achieved.
Description
Technical field
The present invention relates to a kind of open virtual network constructing system based on software defined network and method, belong to technique of internet field, particularly belong to software defined network technical field.
Background technology
Network virtualization is a kind of emerging network technology, it is carried out abstract by Intel Virtualization Technology to the underlying infrastructure (Infrastructure) shared and provides unified programmable interface, to be cut into slices by virtual resource or the mode in tunnel carrys out virtualized infrastructure construction, build on existing architecture and be isolated from each other multiple and the virtual network of isomery, for user provides differentiated service.By existing VLAN (Virtual Local Area Network, VLAN), VPN (virtual private network) (Virtual Private Networks, etc. VPN) technology simply can be isolated virtual network at edge network, and the transfer of data in public the Internet still relies on the transmission mechanism of doing one's best; Meanwhile, these operations are only supported to be provided by basic network keeper, and flow process is loaded down with trivial details and function that is virtual network structure is limited, is not enough to the diversified demand meeting the flexible networking of multi-user.
In software defined network (Software Defined Networking, SDN), " software definition " allows user have more initiative, and user can according to the requirement developing of oneself, the application drawn oneself up and hardware platform.For SDN, it itself is a centralized control framework, multiple network node is unified control, network equipment information can be obtained relatively easily, net control equipment, a unified network view is presented to application/client, wherein there is switch, router, virtual machine, store, virtual subnet and the virtual gateway for communicating between virtual subnet, user can according to the IP address of the network planning configure virtual machine of oneself, configure the routing rule between subnet and subnet, this is all that user realizes the flexible control that independent and flexible builds private network and network and provides good platform.
How to utilize open customization and the centralized control characteristic of SDN, solve the problem that internet is closed, ossify, give the ability of the subscriber customized network system and procotol, promote the visual controllability of network, support that user independently defines personalized networking rule and control strategy, become the technical barrier that current technique of internet field is badly in need of solving.
Summary of the invention
In view of this, the object of the invention is a kind of open virtual network method for customizing based on software defined network of invention and related system thereof, solve network invisible to user, user only can the problem of passive use network, thus realize the network control of user's active participate, from main separation Internet resources, customized network strategy, final realization improves customer service and experiences, and provides target that is intelligent, personalized service.
In order to achieve the above object, the present invention proposes a kind of open virtual network constructing system based on software defined network, described system comprises following functional module:
Network topological information detecting module: the detection of this module in charge network topological information, described network topology mainly refers to the topological structure of the relative logical location between virtual switch, and namely topological structure is in logic, and not physically; Described network topological information is responsible for detection by SDN controller and result is offered application program; Because network topological information is dynamic change, SDN controller sends detection packet, to determine the validity of this virtual switch to be responsible for virtual switch at set intervals; Each virtual switch is directly connected with SDN controller, constitutes the node of described network topological diagram; For the link information between node, SDN controller can be regarded as root node and utilize Doubletree algorithm to detect;
When node occurring and increasing or lost efficacy, add in described network topological diagram or remove this node and connected limit; When link failure, in described network topological diagram, corresponding sides are removed, to ensure the correctness of network topological information;
Detection content comprises the state of node and the state of link, " activity ", " hang-up ", " shutdown " respectively, wherein " activity " state refers to that node or antenna efficiency are normal and has flow to pass through, " hang-up " state refers to that node or link are in idle condition, namely working properly but pass through without flow, it is abnormal, unreachable that " shutdown " state refers to that node or link occur; According to above information, the status data structure table of described network topological information detecting module structure node and link, and submitted to network resource integration module;
Network performance detecting module: the performance of this module in charge detection network, detection content comprises: the agreement etc. that the time delay of the disposal ability of node, the buffer pool size of node and queue length, queue priority scheduling principle and parameter, link and bandwidth, network use, according to above information, the performance information table of described network performance detecting module structure node and link, and submitted to network resource integration module;
The mode of this module detection network has active probe mode and passive detection mode two kinds, described active probe mode points in network the detection packet sent through specific combination, the analysis of the occurrence features change by web influence suffered by detection packet, obtains network state and performance change; Passive detection mode refers to disposes data acquisition unit in the measurement point of network, collects and flows through the network traffics of this measurement point, periodically poll passive detection equipment Information Monitoring, to judge network performance and state;
Network resource integration module: the information that described network topological information detecting module and described network performance detecting module provide is integrated by this module, obtain the data structure with network performance and network topology structure, comprise the data structure table of description node and link, and describe the data structure information of overall network;
Internet resources present module: the Drawing Network Diagram that network resource integration module provides by this module out, be submitted on User Interface and present to user intuitively, be specially: the data structure information that this module provides according to described network resource integration module, depict network topology structure figure, and this topology diagram is presented to user; User can zoom in or out partial network information as required; According to user's needs, this module can present current network performance parameter and physical parameter; User with touch manner unrestricted choice node and link, can carry out information interaction with described open virtual network constructing system and generates topology information easily;
Described network topology structure figure is that a node and link are all with the complicated weighted graph of weight, the weight of its interior joint reflects the current processing capabilities of node, the weight of link is time delay, or bandwidth, or the weighting of time delay and bandwidth is expressed, this complicated weighted graph is the basis of customization virtual network;
User's dummy node selects module: the dummy node of selection, according to described visual physical network resource interface, according to the real needs of oneself, from dummy node and the annexation of main separation finite number, is then submitted to virtual network administration module by user; The topological relation having selected rear virtual network administration module to provide according to user, runs corresponding mapping algorithm and rebuilds virtual network, and system shows predictable network creation effect, and user determines whether again select according to effect;
Virtual network administration module: the virtual resource of this module in charge network resource administration virtualization modules and host resource virtualization modules, and structure and the management of carrying out virtual network; This module is passed through all resource informations in collection, assessment and management bottom-layer network thus is understood the various information of whole network, the mapping of virtual network to existing network topology can be completed according to user's request, allotment and the optimization of global resource can be carried out according to concrete business demand; This module ensures can not clash in the process of Resourse Distribute, makes the mapping of whole virtual network process of runing be convenient to safeguard adjustment, improves the convenience of network control; This module calculates and storage capacity according to virtual machine, the time delay of link and corresponding bandwidth between router, generating virtual network topology structure; This virtual network topology shields the annexation of physical link, and the upper strata for virtual network provides the logic of point-to-point to connect; Internet resources are virtual turns to each user provides in logic independently topological view, for customization virtual network is provided convenience; When described user needs to create multiple virtual network, the concurrent management that the different virtual network of described system of users carries out, meet the differentiated demand of same user's different virtual network, described user also can adjust dynamically or cancel constructed virtual network;
Internet resources virtualization modules: this module completes the mapping of virtual router to existing route device topology according to user's request; By the mode that virtual resource is cut into slices, to be isolated from each other multiple and the virtual network of isomery is mapped on same physical network simultaneously.Internet resources are virtual is divided into node mapping and two stages of link maps, and bottom physical network can support path segmentation flexibly and periodic Path Migration.
Host resource virtualization modules: this module provides virtual for the physical host function becoming multiple fictitious host computer, the host resource fictionalized carries out unified management by being submitted to described virtual network administration module; This host resource virtualization modules provides the control operation interface for virtual machine for user in systems in which, realizes creating the functions such as fictitious host computer, switch fictitious host computer power supply, equipment operating; Realize user to the flexible control of fictitious host computer and dynamic conditioning; Described physical host both performs specific operation as the performance element of order, simultaneously also the part operation order of described system and parameter to be forwarded in fictitious host computer to perform as the unit of reporting of order; Described system utilizes terminal socket mode to communicate between physical host and fictitious host computer;
User Interface module: this module provides user and described open virtual network constructing system to carry out mutual interface, namely interface is divided into four classes: Internet resources display interface, virtual network resource management interface and user's request perception interface, these interfaces are all two-way, namely provide the function of user and system interaction Transfer Parameters;
The function of described Internet resources display interface is: system is periodically shown to user through integrating the network information detected, or user initiatively proposes demand, inquiry current network resources could meet;
The function of described virtual network resource management interface is: user, by the control operation interface of dummy node, realizes dummy node establishment, switch dummy node power supply etc.; User carries out equipment operating to dummy node, realize dummy node store or the increase of network interface or deletion, dummy node complete machine migration etc., realize the flexible control to dummy node and dynamic conditioning; After described dummy node is set up, physical machine starts network service by terminal socket call particular script, sets up and communicates to connect with central control board;
The function of described user's request perception interface is: system, by this interface perception user's request, comprises the type of demand, time, place, preference etc., carries out priority scheduling of resource.
In order to achieve the above object, the present invention proposes a kind of open virtual network construction method based on software defined network, it is characterized in that: described method comprises following operative step:
(1) user logs in open virtual network constructing system by User Interface; Described user had both comprised basic network keeper, business network keeper, also comprised normal network users;
(2) the open virtual network constructing system described in is by the controller collection network resource information in software defined network and intuitively show to user;
(3) user is the discovery that specific transactions carries out resource by described open virtual network constructing system, and proposes service request; Described user comprises the discovery of Internet resources and the discovery of content resource by the resource discovering that system is carried out; Described specific transactions refers to that this user needs the some service application configured;
(4) the open virtual network described in builds custom-built system and provides virtual network customize services to user, and user needs according to specific transactions the customization carrying out virtual network.
User Interface described in described step (1) refers to the operation interface that described open virtual network constructing system is supplied to the terminal of user, the function that user uses described system to provide by operation interface quickly and easily, had both comprised user and had registered the basic network management functions such as the agreement Internet Protocol location interconnected between entrance, network topological diagram interface, search window, neighbouring Internet resources and content resource position display, network; Also comprise virtual network scheme display interface, customizing virtual network, application programming interface API provide, the distinctive function of this opening virtual network construction method such as free mark, third party's correcting data error of location of content; These described operating functions are different according to user right, both comprise basic network keeper, enterprise network administrator, also comprise normal network users, and develop new tactful customization function to enterprise network administrator or normal network users according to network operation strategy open portion basic network bookkeeping, the customization realizing its own virtual network builds.
The particular content that systematic collection Internet resources also carry out display directly perceived to user in described step (2) is: the controller in described system and software defined network is mutual, obtain the resource information of whole network, comprise the real time information such as the operation layer flow information on network topological diagram, network state, the link failure of bottom physical network, network accident and network layer; The described network resource information got gathers by described system, intuitively shown to user by Visual controlling interface, user is showed completely by the present situation of whole network, facilitate subsequent user to carry out self-defined structure virtual network to avoid network congestion, not only just accept network passively; Described system provides basic network to generate service for application, can customize virtual network policy interface for application-specific provides;
In described step (3), the discovery of described Internet resources refers to the inquiry that user is carried out network element device by described open virtual network constructing system, understands inquired about Internet resources particular location residing in a network to help user; The discovery of described content resource refers to the inquiry that user is carried out content resource by system, and the position understood inquired about content resource to help user and distribute in a network, is convenient to user and selects the rational position of described content resource to connect; Described proposition service request refers to that user customized service connects, it can be simply connect end to end that this customize services connects, also can be that user customizes the complicated interconnecting relation in many ways between service node according to specific requirement, make network externally present specific topological features; When a certain service server, certain section of offered load are larger, described open virtual network constructing system carries out the balancing resource load of the overall situation, is optimized scheduling, determines by the service request of which Internet resources completing user the request of user.
The middle system of described step (4) provides virtual network customize services to support to user, and multiple user freely builds proprietary network; The described proprietary network that freely builds relies on network virtualization technology, from main separation Internet resources, according to computing capability and the storage capacity of virtual machine, the time delay of link and corresponding bandwidth between router, generate multiple being isolated from each other and the virtual network of isomery, this net mask annexation of physical link, the upper strata for virtual network provides the logic of point-to-point to connect, for each user provides in logic independently topological view, user is made to obtain the control of network end-to-end.
Open virtual network described in described step (4) builds custom-built system and provides virtual network customize services to user, user according to the particular content of the customization carrying out virtual network that needs of specific transactions is: described open virtual network constructing system detects according to network topology probe and performance the information obtained, and customized personal construction strategy, carry out virtual network mapping calculation according to different construction strategy; Described open virtual network constructing system recommends the constructing plan given tacit consent to user, then user carries out redjustment and modification according to self-demand, and more directly building mode voluntarily, concrete operations are: according to this visual Internet resources interface, user is according to information such as business demand, individual preference, network states, and user is from the dummy node of main separation finite number; The dummy node having selected rear Virtual Networking Computing module to provide according to user, runs corresponding mapping algorithm and rebuilds virtual network, and system shows predictable network creation effect, and user determines whether again select according to effect; When described user needs to create multiple virtual network, the concurrent management that the different virtual network of described system of users carries out, meet the differentiated demand of same user's different virtual network, described user also can adjust dynamically or cancel constructed virtual network.
In described step (4), system provides virtual network customize services to user, and user specifically comprises following operating procedure according to the customization carrying out virtual network that needs of specific transactions:
(401) user's configuration virtual node: user, by the control operation interface of dummy node, realizes dummy node establishment, switch dummy node power supply etc.; User carries out equipment operating to dummy node, realize dummy node store or the increase of network interface or deletion, dummy node complete machine migration etc., realize the flexible control to dummy node and dynamic conditioning; After described dummy node is set up, physical machine starts network service by terminal socket call particular script, sets up and communicates to connect with central control board; Annexation between dummy node opens as configuration interface to user by described system, supports that multiple different topological structure is parallel and disposes; To different users, described system can provide mutually isolated virtual network environment simultaneously, and the topological structure of these virtual network environments all can by described user's customized;
(402) system creation virtual network: described system sets up user account, carries out virtual network setting, creates software router configuration file, carries out network service initialization, and start independent virtual router node; Described system with the configuration information of user for input, or user by mark visualized graph interface on node, between corresponding virtual router, set up virtual link, generating virtual topology of networks; Virtual topology layer shields the annexation of physical link, and the upper strata for virtual network provides the logic of point-to-point to connect;
(403) user carries out virtual network security customization: described system can need the security service of carrying according to the demand for services apolegamy of user, new flow path matches safety means, and configured for heterogeneous networks element, for communication provides the security control of optional rank, the height setting up a through a whole set of infrastructure customizes passage; The Virtual Service built under described security service function can be supported in certain logic environment, without the need to a large amount of manual configuration;
(404) carry out customization to flow to forward: described system works, on virtual topology, provides the data forwarding service of hop-by-hop between dummy node; Forwarding is the datum plane of virtual network, performs route querying function, obtain packet arrive destination the down hop dummy node of process, then encapsulation operation is carried out to message, utilizes corresponding virtual link to forward.
Beneficial effect of the present invention is the open customization and the centralized control characteristic that take full advantage of SDN, effective collecting network information is also shown to user intuitively, achieve open, the autonomous target building virtual network of user, improve the efficiency of transmission of network application, contribute to the intellectuality and the personalization that realize network service.
Accompanying drawing explanation
Fig. 1 is the function structure chart of a kind of open virtual network constructing system based on software defined network that the present invention proposes.
Fig. 2 is the flow chart of a kind of open virtual network construction method based on software defined network that the present invention proposes.
Fig. 3 is emulation experiment of the present invention network of network topological structure used schematic diagram.
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, the present invention proposes a kind of open virtual network constructing system based on software defined network, described system comprises following functional module:
Network topological information detecting module: the detection of this module in charge network topological information, described network topology mainly refers to the topological structure of the relative logical location between virtual switch, and namely topological structure is in logic, and not physically; Described network topological information is responsible for detection by SDN controller and result is offered application program; Because network topological information is dynamic change, SDN controller sends detection packet, to determine the validity of this virtual switch to be responsible for virtual switch at set intervals; Each virtual switch is directly connected with SDN controller, constitutes the node of described network topological diagram; For the link information between node, SDN controller can be regarded as root node and utilize Doubletree algorithm to detect;
When node occurring and increasing or lost efficacy, add in described network topological diagram or remove this node and connected limit; When link failure, in described network topological diagram, corresponding sides are removed, to ensure the correctness of network topological information;
Detection content comprises the state of node and the state of link, " activity ", " hang-up ", " shutdown " respectively, wherein " activity " state refers to that node or antenna efficiency are normal and has flow to pass through, " hang-up " state refers to that node or link are in idle condition, namely working properly but pass through without flow, it is abnormal, unreachable that " shutdown " state refers to that node or link occur; According to above information, the status data structure table of described network topological information detecting module structure node and link, and submitted to network resource integration module;
Network performance detecting module: the performance of this module in charge detection network, detection content comprises: the agreement (as RIP or OSPF) etc. that the time delay of the disposal ability of node, the buffer pool size of node and queue length, queue priority scheduling principle and parameter, link and bandwidth, network use, according to above information, the performance information table of described network performance detecting module structure node and link, and submitted to network resource integration module;
The mode of this module detection network has active probe mode and passive detection mode two kinds, described active probe mode points in network the detection packet that sends through specific combination (as ping, traceroute, mtrace etc.), the analysis of the occurrence features change by web influence suffered by detection packet, obtains network state and performance change; Passive detection mode refers to disposes data acquisition unit (Probe) in the measurement point of network, collects and flows through the network traffics of this measurement point, periodically poll passive detection equipment Information Monitoring, to judge network performance and state;
Network resource integration module: the information that described network topological information detecting module and described network performance detecting module provide is integrated by this module, obtain the data structure with network performance and network topology structure, comprise the data structure table of description node and link, and describe data structure information (state of such as node, bandwidth, capacity, the dispatching principle of overall network; The state of link, time delay, bandwidth; The routing algorithm etc. of network);
Internet resources present module: the Drawing Network Diagram that network resource integration module provides by this module out, be submitted on User Interface and present to user intuitively, be specially: the data structure information that this module provides according to described network resource integration module, depict network topology structure figure, and this topology diagram is presented to user; User can zoom in or out partial network information as required; According to user's needs, this module can present current network performance parameter (time delay and bandwidth) and physical parameter (IP, MAC Address etc.); User with touch manner unrestricted choice node and link, can carry out information interaction with described open virtual network constructing system and generates topology information easily;
Described network topology structure figure is that a node and link are all with the complicated weighted graph of weight, the weight of its interior joint reflects the current processing capabilities of node, the weight of link is time delay, or bandwidth, or the weighting of time delay and bandwidth is expressed, this complicated weighted graph is the basis of customization virtual network;
User's dummy node selects module: the dummy node of selection, according to described visual physical network resource interface, according to the real needs of oneself, from dummy node and the annexation of main separation finite number, is then submitted to virtual network administration module by user; The topological relation having selected rear virtual network administration module to provide according to user, runs corresponding mapping algorithm and rebuilds virtual network, and system shows predictable network creation effect, and user determines whether again select according to effect;
Virtual network administration module: the virtual resource of this module in charge network resource administration virtualization modules and host resource virtualization modules, and structure and the management of carrying out virtual network; This module is passed through all resource informations in collection, assessment and management bottom-layer network thus is understood the various information of whole network, the mapping of virtual network to existing network topology can be completed according to user's request, allotment and the optimization of global resource can be carried out according to concrete business demand; This module ensures can not clash in the process of Resourse Distribute, makes the mapping of whole virtual network process of runing be convenient to safeguard adjustment, improves the convenience of network control; This module calculates and storage capacity according to virtual machine, the time delay of link and corresponding bandwidth between router, generating virtual network topology structure; This virtual network topology shields the annexation of physical link, and the upper strata for virtual network provides the logic of point-to-point to connect; Internet resources are virtual turns to each user provides in logic independently topological view, for customization virtual network is provided convenience; When described user needs to create multiple virtual network, the concurrent management that the different virtual network of described system of users carries out, meet the differentiated demand of same user's different virtual network, described user also can adjust dynamically or cancel constructed virtual network;
Internet resources virtualization modules: this module completes the mapping of virtual router to existing route device topology according to user's request; By the mode that virtual resource is cut into slices, to be isolated from each other multiple and the virtual network of isomery is mapped on same physical network simultaneously.Internet resources are virtual is divided into node mapping and two stages of link maps, and bottom physical network can support path segmentation flexibly and periodic Path Migration.
Host resource virtualization modules: this module provides virtual for the physical host function becoming multiple fictitious host computer, the host resource fictionalized carries out unified management by being submitted to described virtual network administration module; This host resource virtualization modules provides the control operation interface for virtual machine for user in systems in which, realize create fictitious host computer, switch fictitious host computer power supply, equipment operating (as store or the increase deletion of network interface, the complete machine migration etc. of fictitious host computer) etc. function; Realize user to the flexible control of fictitious host computer and dynamic conditioning; Described physical host both performs specific operation as the performance element of order, simultaneously also the part operation order of described system and parameter to be forwarded in fictitious host computer to perform as the unit of reporting of order; Described system utilizes terminal socket mode to communicate between physical host and fictitious host computer;
User Interface module: this module provides user and described open virtual network constructing system to carry out mutual interface, namely interface is divided into four classes: Internet resources display interface, virtual network resource management interface and user's request perception interface, these interfaces are all two-way, namely provide the function of user and system interaction Transfer Parameters;
The function of described Internet resources display interface is: system is periodically shown to user through integrating the network information detected, or user initiatively proposes demand, inquiry current network resources could meet;
The function of described virtual network resource management interface is: user, by the control operation interface of dummy node, realizes dummy node establishment, switch dummy node power supply etc.; User carries out equipment operating to dummy node, realize dummy node store or the increase of network interface or deletion, dummy node complete machine migration etc., realize the flexible control to dummy node and dynamic conditioning; After described dummy node is set up, physical machine starts network service by terminal socket call particular script, sets up and communicates to connect with central control board;
The function of described user's request perception interface is: system, by this interface perception user's request, comprises the type of demand, time, place, preference etc., carries out priority scheduling of resource.
See Fig. 2, the present invention proposes a kind of open virtual network construction method based on software defined network, it is characterized in that: described method comprises following operative step:
(1) user logs in open virtual network constructing system by User Interface; Described user had both comprised basic network keeper, business network keeper, also comprised normal network users;
(2) the open virtual network constructing system described in is by the controller collection network resource information in software defined network and intuitively show to user;
(3) user is the discovery that specific transactions carries out resource by described open virtual network constructing system, and proposes service request; Described user comprises the discovery of Internet resources and the discovery of content resource by the resource discovering that system is carried out; Described specific transactions refers to that this user needs the some service application configured;
(4) the open virtual network described in builds custom-built system and provides virtual network customize services to user, and user needs according to specific transactions the customization carrying out virtual network.
User Interface described in described step (1) refers to the operation interface that described open virtual network constructing system is supplied to the terminal of user, the function that user uses described system to provide by operation interface quickly and easily, had both comprised user and had registered the basic network management functions such as the agreement Internet Protocol location interconnected between entrance, network topological diagram interface, search window, neighbouring Internet resources and content resource position display, network; Also comprise virtual network scheme display interface, customizing virtual network, application programming interface API provide, the distinctive function of this opening virtual network construction method such as free mark, third party's correcting data error of location of content; These described operating functions are different according to user right, both comprise basic network keeper, enterprise network administrator, also comprise normal network users, and develop new tactful customization function to enterprise network administrator or normal network users according to network operation strategy open portion basic network bookkeeping, the customization realizing its own virtual network builds.
The particular content that systematic collection Internet resources also carry out display directly perceived to user in described step (2) is: the controller in described system and software defined network is mutual, obtain the resource information of whole network, comprise network topological diagram and (as comprise switch, gateway, bridge, fire compartment wall, server, WAP (wireless access point) etc., describe with the title of these network equipments corresponding, state, physical meaning etc.), network state (as comprise link bandwidth, time delay, congested, shake, throughput, packet loss etc.), the link failure of bottom physical network, operation layer flow information on network accident and network layer is (as type of service, service condition, operational space distributes, the service traffics flow direction etc.) etc. real time information, the described network resource information got gathers by described system, intuitively shown to user by Visual controlling interface, user is showed completely by the present situation of whole network, facilitate subsequent user to carry out self-defined structure virtual network to avoid network congestion, not only just accept network passively, described system provides basic network to generate service for application, can customize virtual network policy interface for application-specific provides,
In described step (3), the discovery of described Internet resources refers to the inquiry that user is carried out network element device by described open virtual network constructing system, understands inquired about Internet resources particular location residing in a network to help user; The discovery of described content resource refers to the inquiry that user is carried out content resource by system, and the position understood inquired about content resource to help user and distribute in a network, is convenient to user and selects the rational position of described content resource to connect; Described proposition service request refers to that user customized service connects, it can be simply connect end to end that this customize services connects, also can be that user customizes the complicated interconnecting relation in many ways between service node according to specific requirement, make network externally present specific topological features; When a certain service server, certain section of offered load are larger, described open virtual network constructing system carries out the balancing resource load of the overall situation, is optimized scheduling, determines by the service request of which Internet resources completing user the request of user.
The middle system of described step (4) provides virtual network customize services to support to user, and multiple user freely builds proprietary network; The described proprietary network that freely builds relies on network virtualization technology, from main separation Internet resources, according to computing capability and the storage capacity of virtual machine, the time delay of link and corresponding bandwidth between router, generate multiple being isolated from each other and the virtual network of isomery, this net mask annexation of physical link, the upper strata for virtual network provides the logic of point-to-point to connect, for each user provides in logic independently topological view, user is made to obtain the control of network end-to-end.
Open virtual network described in described step (4) builds custom-built system and provides virtual network customize services to user, user according to the particular content of the customization carrying out virtual network that needs of specific transactions is: described open virtual network constructing system detects according to network topology probe and performance the information obtained, and customized personal construction strategy, carry out virtual network mapping calculation according to different construction strategy; Described open virtual network constructing system recommends the constructing plan given tacit consent to user, then user carries out redjustment and modification according to self-demand, and more directly building mode voluntarily, concrete operations are: according to this visual Internet resources interface, user is according to information such as business demand, individual preference, network states, and user is from the dummy node of main separation finite number; The dummy node having selected rear Virtual Networking Computing module to provide according to user, runs corresponding mapping algorithm and rebuilds virtual network, and system shows predictable network creation effect, and user determines whether again select according to effect; When described user needs to create multiple virtual network, the concurrent management that the different virtual network of described system of users carries out, meet the differentiated demand of same user's different virtual network, described user also can adjust dynamically or cancel constructed virtual network.
In described step (4), system provides virtual network customize services to user, and user specifically comprises following operating procedure according to the customization carrying out virtual network that needs of specific transactions:
(401) user's configuration virtual node: user, by the control operation interface of dummy node, realizes dummy node establishment, switch dummy node power supply etc.; User carries out equipment operating to dummy node, realize dummy node store or the increase of network interface or deletion, dummy node complete machine migration etc., realize the flexible control to dummy node and dynamic conditioning; After described dummy node is set up, physical machine starts network service by terminal socket call particular script, sets up and communicates to connect with central control board; Annexation between dummy node opens as configuration interface to user by described system, supports that multiple different topological structure is parallel and disposes; To different users, described system can provide mutually isolated virtual network environment simultaneously, and the topological structure of these virtual network environments all can by described user's customized;
(402) system creation virtual network: described system sets up user account, carries out virtual network setting, creates software router configuration file, carries out network service initialization, and start independent virtual router node; Described system with the configuration information of user for input, or user by mark visualized graph interface on node, between corresponding virtual router, set up virtual link, generating virtual topology of networks; Virtual topology layer shields the annexation of physical link, and the upper strata for virtual network provides the logic of point-to-point to connect;
(403) user carries out virtual network security customization: described system can need the security service of carrying according to the demand for services apolegamy of user, new flow path is matched safety means (such as fire compartment wall, IDS/IPS, load balancer, the functions such as VPN), and configured for heterogeneous networks element, for communication provides the security control of optional rank, the height setting up a through a whole set of infrastructure customizes passage; The Virtual Service built under described security service function can be supported in certain logic environment, without the need to a large amount of manual configuration;
(404) carry out customization to flow to forward: described system works, on virtual topology, provides the data forwarding service of hop-by-hop between dummy node; Forwarding is the datum plane of virtual network, performs route querying function, obtain packet arrive destination the down hop dummy node of process, then encapsulation operation is carried out to message, utilizes corresponding virtual link to forward.
See Fig. 3, the SDN Simulation Test Environment Mininet that inventor adopts technique of internet field extensively to approve, has carried out test emulation experiment to the system and method that the present invention carries.
50 testers take part in this test.The demand of user be build on provided bottom physical network meet the controlled of self-demand can the virtual network of pipe.
Imagine user in experiment to need in the dummy node of virtual network requests 1 and 2 and the link assignment on earth corresponding physical node of layer physical network and link.Virtual network requests 1 by a, b two node form with the link being connected them, its interior joint a requires the cpu resource of 40 units, and node b requires the cpu resource of 15 units, link bandwidth resource require be 20 units.Virtual network requests 2 is made up of with three links being connected them between two c, d, e tri-nodes, its interior joint c and d requires the cpu resource of 10 units respectively, node e requires the cpu resource of 30 units, the bandwidth resources of ce, de two link requirement 15 units, link cd requires the bandwidth resources of 10 units.The visible table 1 of the resource situation of node and link on bottom physical network:
Table 1 bottom physical network resource situation
Existing one classical virtual network mapping algorithm and the up-to-date virtual network mapping algorithm of one is adopted to map, two virtual network requests to compare on the one hand in experiment.Classic algorithm is the algorithm that the people such as Minlan Yu in 2008 propose in article " Rethinking virtual network embedding:substrate support for path splitting and migration ", and latest algorithm is the NDC algorithm that the people such as Jianxin Liao proposed in " Topology-aware Virtual Network Embedding Using Multiple Characteristics " literary composition in 2014.The another aspect of experiment plays the part of user by every tester, and the system and method adopting the present invention to carry under to Algorithm mapping result and the complete unwitting situation of other tester's test results carries out node and link maps is selected.
Experimental result is specific as follows:
Evaluation index 1: benefit cost ratio (Revenue/Cost Ratio)
Calculate mapping result evaluation to classic algorithm, the benefit cost ratio of mapping is 0.5344; Calculate mapping result evaluation to latest algorithm NDC, the benefit cost ratio of mapping is 0.5469; The mapping result that the system and method adopting the present invention to carry to 50 testers obtains is added up, and the average yield cost ratio of mapping is 0.5587
Situation 2: subjective service satisfactory degree
For every tester, the mapping result three that the system and method that classic algorithm result, latest algorithm result and himself employing the present invention carry obtains is carried out black box testing by us, tester carries out actual motion test when learning specific algorithm and result to mapping the virtual network 1 and 2 obtained, and then experiences the real network of two virtual networks in three kinds of situations and sorts.For virtual network 1, the mapping result having 47 have selected in 50 testers to adopt the system and method carried of the present invention to obtain is as optimal result; And for virtual network 2, the mapping result then having 43 have selected in 50 testers to adopt the system and method carried of the present invention to obtain is as optimal result.
Interpretation of result:
50 testers adopt the customed virtual network mapping policy of inventor two virtual networks to be mapped on bottom physical network, and respective result and classic algorithm result and latest algorithm result are carried out actual motion experience, and make evaluation.We then by service satisfactory degree two aspect of objective benefit cost ratio and subjectivity by customed virtual network mapping policy and classic algorithm and latest algorithm comparative evaluation.Experimental result shows, using objective benefit cost ratio as evaluation index, customed virtual network mapping policy can obtain than classic algorithm and the higher mapping result of latest algorithm efficiency; Using the service satisfactory degree of subjectivity as evaluation index, customed virtual network mapping policy is obtained for the mapping result making user more satisfied than classic algorithm and latest algorithm in most cases.
Experimental result sufficient proof utilizes the virtual network mapping policy customized to complete, and task that virtual network maps is feasible.Customed mapping result is higher than direct executing arithmetic efficiency, and more flexibly, the demand of being also more close to the users, makes user's participative decision making become possibility.
Inventor, through a large amount of experiments and emulation, obtains satisfied experimental result, and proved invention is feasible and very effective.
Claims (8)
1., based on an open virtual network constructing system for software defined network, it is characterized in that: described system comprises following functional module:
Network topological information detecting module: the detection of this module in charge network topological information, described network topology mainly refers to the topological structure of the relative logical location between virtual switch, and namely topological structure is in logic, and not physically; Described network topological information is responsible for detection by SDN controller and result is offered application program; Because network topological information is dynamic change, SDN controller sends detection packet, to determine the validity of this virtual switch to be responsible for virtual switch at set intervals; Each virtual switch is directly connected with SDN controller, constitutes the node of described network topological diagram; For the link information between node, SDN controller can be regarded as root node and utilize Doubletree algorithm to detect;
When node occurring and increasing or lost efficacy, add in described network topological diagram or remove this node and connected limit; When link failure, in described network topological diagram, corresponding sides are removed, to ensure the correctness of network topological information;
Detection content comprises the state of node and the state of link, " activity ", " hang-up ", " shutdown " respectively, wherein " activity " state refers to that node or antenna efficiency are normal and has flow to pass through, " hang-up " state refers to that node or link are in idle condition, namely working properly but pass through without flow, it is abnormal, unreachable that " shutdown " state refers to that node or link occur; According to above information, the status data structure table of described network topological information detecting module structure node and link, and submitted to network resource integration module;
Network performance detecting module: the performance of this module in charge detection network, detection content comprises: the agreement etc. that the time delay of the disposal ability of node, the buffer pool size of node and queue length, queue priority scheduling principle and parameter, link and bandwidth, network use, according to above information, the performance information table of described network performance detecting module structure node and link, and submitted to network resource integration module;
The mode of this module detection network has active probe mode and passive detection mode two kinds, described active probe mode points in network the detection packet sent through specific combination, the analysis of the occurrence features change by web influence suffered by detection packet, obtains network state and performance change; Passive detection mode refers to disposes data acquisition unit in the measurement point of network, collects and flows through the network traffics of this measurement point, periodically poll passive detection equipment Information Monitoring, to judge network performance and state;
Network resource integration module: the information that described network topological information detecting module and described network performance detecting module provide is integrated by this module, obtain the data structure with network performance and network topology structure, comprise the data structure table of description node and link, and describe the data structure information of overall network; Internet resources present module: the Drawing Network Diagram that network resource integration module provides by this module out, be submitted on User Interface and present to user intuitively, be specially: the data structure information that this module provides according to described network resource integration module, depict network topology structure figure, and this topology diagram is presented to user; User can zoom in or out partial network information as required; According to user's needs, this module can present current network performance parameter and physical parameter; User with touch manner unrestricted choice node and link, can carry out information interaction with described open virtual network constructing system and generates topology information easily;
Described network topology structure figure is that a node and link are all with the complicated weighted graph of weight, the weight of its interior joint reflects the current processing capabilities of node, the weight of link is time delay, or bandwidth, or the weighting of time delay and bandwidth is expressed, this complicated weighted graph is the basis of customization virtual network;
User's dummy node selects module: the dummy node of selection, according to described visual physical network resource interface, according to the real needs of oneself, from dummy node and the annexation of main separation finite number, is then submitted to virtual network administration module by user; The topological relation having selected rear virtual network administration module to provide according to user, runs corresponding mapping algorithm and rebuilds virtual network, and system shows predictable network creation effect, and user determines whether again select according to effect;
Virtual network administration module: the virtual resource of this module in charge network resource administration virtualization modules and host resource virtualization modules, and structure and the management of carrying out virtual network; This module is passed through all resource informations in collection, assessment and management bottom-layer network thus is understood the various information of whole network, the mapping of virtual network to existing network topology can be completed according to user's request, allotment and the optimization of global resource can be carried out according to concrete business demand; This module ensures can not clash in the process of Resourse Distribute, makes the mapping of whole virtual network process of runing be convenient to safeguard adjustment, improves the convenience of network control; This module calculates and storage capacity according to virtual machine, the time delay of link and corresponding bandwidth between router, generating virtual network topology structure; This virtual network topology shields the annexation of physical link, and the upper strata for virtual network provides the logic of point-to-point to connect; Internet resources are virtual turns to each user provides in logic independently topological view, for customization virtual network is provided convenience; When described user needs to create multiple virtual network, the concurrent management that the different virtual network of described system of users carries out, meet the differentiated demand of same user's different virtual network, described user also can adjust dynamically or cancel constructed virtual network;
Internet resources virtualization modules: this module completes the mapping of virtual router to existing route device topology according to user's request; By the mode that virtual resource is cut into slices, to be isolated from each other multiple and the virtual network of isomery is mapped on same physical network simultaneously; Internet resources are virtual is divided into node mapping and two stages of link maps, and bottom physical network can support path segmentation flexibly and periodic Path Migration;
Host resource virtualization modules: this module provides virtual for the physical host function becoming multiple fictitious host computer, the host resource fictionalized carries out unified management by being submitted to described virtual network administration module; This host resource virtualization modules provides the control operation interface for virtual machine for user in systems in which, realizes creating the functions such as fictitious host computer, switch fictitious host computer power supply, equipment operating; Realize user to the flexible control of fictitious host computer and dynamic conditioning; Described physical host both performs specific operation as the performance element of order, simultaneously also the part operation order of described system and parameter to be forwarded in fictitious host computer to perform as the unit of reporting of order; Described system utilizes terminal socket mode to communicate between physical host and fictitious host computer;
User Interface module: this module provides user and described open virtual network constructing system to carry out mutual interface, namely interface is divided into four classes: Internet resources display interface, virtual network resource management interface and user's request perception interface, these interfaces are all two-way, namely provide the function of user and system interaction Transfer Parameters;
The function of described Internet resources display interface is: system is periodically shown to user through integrating the network information detected, or user initiatively proposes demand, inquiry current network resources could meet;
The function of described virtual network resource management interface is: user, by the control operation interface of dummy node, realizes dummy node establishment, switch dummy node power supply etc.; User carries out equipment operating to dummy node, realize dummy node store or the increase of network interface or deletion, dummy node complete machine migration etc., realize the flexible control to dummy node and dynamic conditioning; After described dummy node is set up, physical machine starts network service by terminal socket call particular script, sets up and communicates to connect with central control board;
The function of described user's request perception interface is: system, by this interface perception user's request, comprises the type of demand, time, place, preference etc., carries out priority scheduling of resource.
2., based on an open virtual network construction method for software defined network, it is characterized in that: described method comprises following operative step:
(1) user logs in open virtual network constructing system by User Interface; Described user had both comprised basic network keeper, business network keeper, also comprised normal network users;
(2) the open virtual network constructing system described in is by the controller collection network resource information in software defined network and intuitively show to user;
(3) user is the discovery that specific transactions carries out resource by described open virtual network constructing system, and proposes service request; Described user comprises the discovery of Internet resources and the discovery of content resource by the resource discovering that system is carried out; Described specific transactions refers to that this user needs the some service application configured;
(4) the open virtual network described in builds custom-built system and provides virtual network customize services to user, and user needs according to specific transactions the customization carrying out virtual network.
3. a kind of open virtual network construction method based on software defined network according to claim 2, it is characterized in that: the User Interface described in described step (1) refers to the operation interface that described open virtual network constructing system is supplied to the terminal of user, the function that user uses described system to provide by operation interface quickly and easily, both comprise user and register entrance, network topological diagram interface, search window, neighbouring Internet resources and content resource position display, basic network management function is waited in the agreement Internet Protocol location interconnected between network, also comprise virtual network scheme display interface, customizing virtual network, application programming interface API provide, the distinctive function of this opening virtual network construction method such as free mark, third party's correcting data error of location of content, these described operating functions are different according to user right, both comprise basic network keeper, enterprise network administrator, also comprise normal network users, and develop new tactful customization function to enterprise network administrator or normal network users according to network operation strategy open portion basic network bookkeeping, the customization realizing its own virtual network builds.
4. a kind of open virtual network construction method based on software defined network according to claim 2, it is characterized in that: the particular content that systematic collection Internet resources also carry out display directly perceived to user in described step (2) is: the controller in described system and software defined network is mutual, obtain the resource information of whole network, comprise the real time information such as the operation layer flow information on network topological diagram, network state, the link failure of bottom physical network, network accident and network layer; The described network resource information got gathers by described system, intuitively shown to user by Visual controlling interface, user is showed completely by the present situation of whole network, facilitate subsequent user to carry out self-defined structure virtual network to avoid network congestion, not only just accept network passively; Described system provides basic network to generate service for application, can customize virtual network policy interface for application-specific provides.
5. a kind of open virtual network construction method based on software defined network according to claim 2, it is characterized in that: in described step (3), the discovery of described Internet resources refers to the inquiry that user is carried out network element device by described open virtual network constructing system, understands inquired about Internet resources particular location residing in a network to help user; The discovery of described content resource refers to the inquiry that user is carried out content resource by system, and the position understood inquired about content resource to help user and distribute in a network, is convenient to user and selects the rational position of described content resource to connect; Described proposition service request refers to that user customized service connects, it can be simply connect end to end that this customize services connects, also can be that user customizes the complicated interconnecting relation in many ways between service node according to specific requirement, make network externally present specific topological features; When a certain service server, certain section of offered load are larger, described open virtual network constructing system carries out the balancing resource load of the overall situation, is optimized scheduling, determines by the service request of which Internet resources completing user the request of user.
6. a kind of open virtual network construction method based on software defined network according to claim 2, is characterized in that: in described step (4) system provide virtual network customize services to support to user multiple user freely builds proprietary network; The described proprietary network that freely builds relies on network virtualization technology, from main separation Internet resources, according to computing capability and the storage capacity of virtual machine, the time delay of link and corresponding bandwidth between router, generate multiple being isolated from each other and the virtual network of isomery, this net mask annexation of physical link, the upper strata for virtual network provides the logic of point-to-point to connect, for each user provides in logic independently topological view, user is made to obtain the control of network end-to-end.
7. a kind of open virtual network construction method based on software defined network according to claim 2, it is characterized in that: the open virtual network described in described step (4) builds custom-built system and provides virtual network customize services to user, user according to the particular content of the customization carrying out virtual network that needs of specific transactions is: described open virtual network constructing system detects according to network topology probe and performance the information obtained, and customized personal construction strategy, carry out virtual network mapping calculation according to different construction strategy; Described open virtual network constructing system recommends the constructing plan given tacit consent to user, then user carries out redjustment and modification according to self-demand, and more directly building mode voluntarily, concrete operations are: according to this visual Internet resources interface, user is according to information such as business demand, individual preference, network states, and user is from the dummy node of main separation finite number; The dummy node having selected rear Virtual Networking Computing module to provide according to user, runs corresponding mapping algorithm and rebuilds virtual network, and system shows predictable network creation effect, and user determines whether again select according to effect; When described user needs to create multiple virtual network, the concurrent management that the different virtual network of described system of users carries out, meet the differentiated demand of same user's different virtual network, described user also can adjust dynamically or cancel constructed virtual network.
8. a kind of open virtual network construction method based on software defined network according to claim 2, it is characterized in that: in described step (4), system provides virtual network customize services to user, and user specifically comprises following operating procedure according to the customization carrying out virtual network that needs of specific transactions:
(401) user's configuration virtual node: user, by the control operation interface of dummy node, realizes dummy node establishment, switch dummy node power supply etc.; User carries out equipment operating to dummy node, realize dummy node store or the increase of network interface or deletion, dummy node complete machine migration etc., realize the flexible control to dummy node and dynamic conditioning; After described dummy node is set up, physical machine starts network service by terminal socket call particular script, sets up and communicates to connect with central control board; Annexation between dummy node opens as configuration interface to user by described system, supports that multiple different topological structure is parallel and disposes; To different users, described system can provide mutually isolated virtual network environment simultaneously, and the topological structure of these virtual network environments all can by described user's customized;
(402) system creation virtual network: described system sets up user account, carries out virtual network setting, creates software router configuration file, carries out network service initialization, and start independent virtual router node; Described system with the configuration information of user for input, or user by mark visualized graph interface on node, between corresponding virtual router, set up virtual link, generating virtual topology of networks; Virtual topology layer shields the annexation of physical link, and the upper strata for virtual network provides the logic of point-to-point to connect;
(403) user carries out virtual network security customization: described system can need the security service of carrying according to the demand for services apolegamy of user, new flow path matches safety means, and configured for heterogeneous networks element, for communication provides the security control of optional rank, the height setting up a through a whole set of infrastructure customizes passage; The Virtual Service built under described security service function can be supported in certain logic environment, without the need to a large amount of manual configuration;
(404) carry out customization to flow to forward: described system works, on virtual topology, provides the data forwarding service of hop-by-hop between dummy node; Forwarding is the datum plane of virtual network, performs route querying function, obtain packet arrive destination the down hop dummy node of process, then encapsulation operation is carried out to message, utilizes corresponding virtual link to forward.
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