WO2016045275A1 - 一种软件定义网络实现方法、主控制器和计算机存储介质 - Google Patents

一种软件定义网络实现方法、主控制器和计算机存储介质 Download PDF

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WO2016045275A1
WO2016045275A1 PCT/CN2015/071215 CN2015071215W WO2016045275A1 WO 2016045275 A1 WO2016045275 A1 WO 2016045275A1 CN 2015071215 W CN2015071215 W CN 2015071215W WO 2016045275 A1 WO2016045275 A1 WO 2016045275A1
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port
topology information
network
network topology
switching device
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PCT/CN2015/071215
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English (en)
French (fr)
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王翱
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • 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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  • the present invention relates to the field of communications, and in particular, to a software defined network implementation method, a main controller, and a computer storage medium.
  • SDN Software Defined Network
  • a switching device is only responsible for pure data forwarding, and its hardware architecture tends to be unified, and its components tend to be generalized among various vendors.
  • the control plane responsible for routing, security, policy, quality of service (QoS), traffic engineering, etc. will be implemented by a dedicated SDN controller.
  • An SDN controller controls multiple SDN switching devices, and the protocol for communication between the SDN switching device and the SDN controller is generally an OpenFlow protocol.
  • a typical SDN network topology diagram is shown in Figure 1. In the SDN network, two controllers are included, each controller controlling a plurality of switching devices.
  • embodiments of the present invention are expected to provide a software definition.
  • Network implementation method, main controller and computer storage medium are expected to provide a software definition.
  • An embodiment of the present invention provides a software-defined network SDN implementation method, where the method includes:
  • the main controller obtains the overall topology information of the current network, and generates a fully connected and loop-free network topology map according to the current network topology information.
  • the main controller determines a port list that needs to be blocked and/or needs to be unblocked according to the current network overall topology information and the generated network topology map, and performs blocking or unblocking processing of the corresponding port according to the port list.
  • the acquiring, by the main controller, the overall topology information of the current network includes:
  • the main controller receives first network topology information sent from the controller, where the first network topology information includes network topology information of all switching devices controlled by the controller;
  • the main controller acquires its own second network topology information, where the second network topology information includes network topology information of all switching devices controlled by the main controller;
  • the main controller comprehensively analyzes the first network topology information and the second network topology information to generate overall topology information of the current network.
  • the first network topology information includes: a media access control MAC address, a port number, and a connection relationship between the switching devices of all switching devices controlled by the controller;
  • the second network topology information includes: a MAC address, a port number, and a connection relationship between the switching devices of all switching devices controlled by the primary controller.
  • the main controller generates a fully connected and loop-free network topology map according to the current network overall topology information, including: the main controller analyzes the current network overall topology information according to the spanning tree algorithm to generate full connectivity, no Network topology diagram of the loop.
  • the primary controller determines, according to the current network overall topology information and the generated network topology map, a list of ports that need to be blocked and/or need to be unblocked, including:
  • the main controller determines the overall topology of the current network according to the overall topology information of the current network, and compares the generated network topology map with the connection relationship of all switching device ports in the current network topology map, and determines that the ports satisfying the following two conditions need to be blocked.
  • Condition 1 not connected to each other in the generated network topology diagram
  • Condition 2 ports that are interconnected in the overall topology of the current network
  • Condition 3 Connected to each other in the generated network topology diagram
  • Condition 4 Ports that are physically connected to each other in the current network overall topology but are not connected to each other due to congestion.
  • the main controller performs blocking or unblocking processing of the corresponding port according to the port list, including:
  • the master controller sends a port blocking message to the switching device where the blocked port is located to indicate that the switching device blocks the corresponding port, where the port blocking message includes the port number of the blocked port and the switching device of the switching device to which the blocked port belongs. Address; and/or,
  • the master controller sends a port unblocking message to the switching device where the blocked port is located to instruct the switching device to revoke the blocking of the corresponding port, where the port undo blocking message includes the port number of the unblocked port, and is revoked Indicates the switching device address of the switching device to which the blocked port belongs.
  • the embodiment of the present invention further provides a controller, where the main controller includes: a topology information acquiring module, a topology map generating module, an analyzing module, and a processing module;
  • the topology information acquiring module is configured to acquire overall topology information of the current network
  • the topology map generating module is configured to generate a fully connected and loop-free network topology map according to the current network overall topology information
  • the analyzing module is configured to determine a port list that needs to be blocked and/or needs to be unblocked according to the current network overall topology information and the generated network topology map;
  • the processing module is configured to perform blocking and/or unblocking processing of the corresponding port according to the port list that needs to be blocked and/or needs to be unblocked.
  • the topology information acquiring module is configured to obtain the current topology information of the entire network in the following manner:
  • second network topology information includes network topology information of all switching devices controlled by the primary controller
  • the first network topology information and the second network topology information are comprehensively analyzed to generate overall topology information of the current network.
  • the first network topology information includes: a MAC address, a port number, and a connection relationship between the switching devices of all switching devices controlled by the controller;
  • the second network topology information includes: a MAC address, a port number, and a connection relationship between the switching devices of all switching devices controlled by the primary controller.
  • the topology map generating module is configured to generate a fully connected and loop-free network topology diagram in the following manner:
  • the topology map generation module analyzes the overall topology information of the current network according to the spanning tree algorithm, and generates a fully connected and loop-free network topology map.
  • the analysis module is configured to determine a list of ports that need to be blocked and/or need to be unblocked by:
  • Condition 1 not connected to each other in the generated network topology diagram
  • Condition 2 ports that are interconnected in the overall topology of the current network
  • Condition 3 Connected to each other in the generated network topology diagram
  • Condition 4 Ports that are physically connected to each other in the current network overall topology but are not connected to each other due to congestion.
  • the processing module is configured to perform blocking of the corresponding port by: And / or undo blocking processing:
  • the processing module sends a port blocking message to the switching device where the blocked port is located to indicate that the switching device blocks the corresponding port, where the port blocking message includes the port number of the blocked port and the switching device address of the switching device to which the blocked port belongs. ;and / or,
  • the processing module sends a port unblocking message to the switching device where the blocked port is located to instruct the switching device to revoke the blocking of the corresponding port, where the port undo blocking message includes the port number of the unblocked port, and is unblocked.
  • the switching device address of the switching device to which the port belongs.
  • the embodiment of the present invention further provides a computer storage medium, the storage medium comprising a set of computer executable instructions, the instructions being used to execute the software defined network implementation method according to the embodiment of the present invention.
  • a software-defined network method, a main controller, and a computer storage medium are provided by the embodiment of the present invention.
  • the main controller obtains the overall topology information of the current network, and generates a fully connected and loop-free network topology map according to the current network overall topology information.
  • the master controller determines a port list that needs to be blocked and/or needs to be unblocked according to the current network overall topology information and the generated network topology map, and performs blocking or unblocking processing of the corresponding port according to the port list.
  • the main controller can analyze and process the overall topology information of the current network, generate a fully connected, loop-free network topology map, and adjust the current network topology according to the generated network topology map, thereby forming a fully connected, no The network topology of the loop, because there are no loops in the network, thus avoiding broadcast storms; on the other hand, the overall topology information of the current network is analyzed and processed to generate a fully connected, loop-free network topology map.
  • the integration of functions into a single main controller greatly simplifies the design of switching devices and reduces network costs.
  • FIG. 1 is a basic structural diagram of a typical SDN network in the prior art
  • Figure 2 shows a conventional SDN network implementation
  • FIG. 3 is a basic flowchart of an implementation method of an SDN network according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram 1 of an SDN network topology structure according to an embodiment of the present invention.
  • FIG. 5 is a second schematic diagram of an SDN network according to an embodiment of the present invention.
  • FIG. 6 is a third schematic diagram of an SDN network topology according to an embodiment of the present invention.
  • FIG. 7 is a fourth structural diagram of an SDN network according to an embodiment of the present invention.
  • FIG. 8 is a basic structural diagram of a main controller according to an embodiment of the present invention.
  • the main controller acquires the overall topology information of the current network, and generates a fully connected and loop-free network topology map according to the current network overall topology information; the main controller according to the current network overall topology information and the generated network topology map. Determining a list of ports that need to be blocked and/or need to be unblocked, and perform blocking or unblocking processing of the corresponding port according to the port list.
  • a first embodiment of the present invention provides a software-defined network implementation method. As shown in FIG. 3, the method includes the following steps:
  • Step 301 The main controller acquires the overall topology information of the current network, and generates a fully connected and loop-free network topology map according to the current network overall topology information.
  • the main controller may be any one of the controllers in the SDN network.
  • the main controller may be determined according to various manners, for example, the controller with the strongest performance in the network is used as the main controller, or A controller with a minimum media access control (MAC) address is used as a master controller; and in the SDN network, other controllers other than the master controller are determined as slave controllers.
  • MAC media access control
  • the acquiring, by the main controller, the overall topology information of the current network includes:
  • the primary controller receives first network topology information sent from the controller, the first network topology Information refers to network topology information of all switching devices controlled from the controller;
  • the primary controller acquires its own second network topology information, where the second network topology information refers to network topology information of all switching devices controlled by the primary controller;
  • the main controller comprehensively analyzes the first network topology information and the second network topology information to generate overall topology information of the current network.
  • the topology information includes: a MAC address, a port number, and a connection relationship between the switching devices of all switching devices controlled by the controller (the primary controller and/or the secondary controller).
  • the main controller generates a fully connected and loop-free network topology map according to the overall network topology information of the current network, including: the primary controller analyzes the current network overall topology information according to the spanning tree algorithm, and generates a fully connected and loop-free network. Topology.
  • Step 302 The main controller determines, according to the current network overall topology information and the generated network topology map, a port list that needs to be blocked and/or needs to be unblocked, and performs blocking or unblocking processing of the corresponding port according to the port list.
  • the main controller determines the overall topology of the current network according to the overall topology information of the current network, compares the generated network topology map with the overall topology of the current network, and determines a list of ports that need to be blocked and/or need to be unblocked; the generated network topology is compared.
  • Figure and the connection relationship between ports of all switching devices in the current network overall topology are determined as ports that need to be blocked:
  • Condition 1 not connected to each other in the generated network topology diagram
  • Condition 2 ports that are interconnected in the overall topology of the current network
  • Condition 3 Connected to each other in the generated network topology diagram
  • Condition 4 Ports that are physically connected to each other in the current network overall topology but are not connected to each other due to congestion.
  • the switching device 1 For example, if in the generated network topology diagram, the 3 ports of the switching device 1 and the 7 ports of the switching device 4 are not connected to each other, but in the current network topology, the switching device 1 3 The port and the 7 ports of the switching device 4 are connected to each other, and the port 3 of the switching device 1 and the port 7 of the switching device 4 are determined as ports that need to be blocked;
  • the 5 ports of the switching device 3 and the 3 ports of the switching device 6 are connected to each other, but in the current network topology, although the 5 ports and 3 ports are physically connected to each other, The 5 ports and 3 ports are blocked so that the two ports cannot be connected to each other, and the 5 ports of the switching device 3 and the 3 ports of the switching device 6 are determined as ports that need to be unblocked.
  • the primary controller compares the generated network topology map with the current network overall topology and determines that the generated network topology map is the same as the current network overall topology, it is determined that there is no port list that needs to be blocked or needs to be unblocked.
  • the primary controller After determining the list of ports that need to be blocked and/or need to be unblocked, the primary controller sends a port blocking message to the switching device where the blocked port is located, the port blocking message includes the port number of the blocked port, and the blocked port.
  • the switching device address of the switching device to which it belongs; and/or,
  • the master controller sends a port revocation blocking message to the switching device where the blocked port is located, where the port revocation blocking message includes the port number of the unblocked port and the switching device address of the switching device to which the blocked port belongs.
  • the port blocking message or the port unblocking message may be an OpenFlow protocol message
  • the switching device that receives the above port blocking message searches for and blocks the port corresponding to the port number according to the port number in the port blocking message;
  • the switching device that receives the above-mentioned port revocation blocking message searches for the port number in the blocking message according to the port, and searches for the port of the corresponding port number to be unblocked.
  • the master controller receives the updated topology information sent by the slave controller, and regenerates a new network topology map according to the updated topology information, thereby comparing The new network topology map and the previously generated network topology map, determine a list of ports that need to be blocked or unblocked, and perform blocking or unblocking processing of the corresponding port according to the port list; thus, the method provided by the embodiment of the present invention.
  • the topology sends changes, only the master controller and the slave controller whose part of the network topology changes need to participate in the network topology update, which can improve the update rate of the network topology and simplify the workload of other slave controllers.
  • the basic topology of the SDN network has two controllers and eight switches in the SDN network, wherein the controller controls four switches, and the four switches are respectively identified as S1, S2, S3, and S4. Controller 2 controls the other four, which are S5, S6, S7 and S8.
  • the controller and the switch are connected through a 100M Ethernet (FE) to transmit OpenFlow protocol packets and broadcast messages.
  • the switch connects 10 Gigabit Ethernet (10GE) to transmit service packets and OpenFlow protocol packets.
  • Step 1 Set controller 1 of the two controllers as the master controller to control all devices in the entire network.
  • Step 2 The controllers 1 and 2 respectively obtain the network topology information of the four switches controlled by the controller, and the network topology information includes the IP address, the port number, and the network topology connection relationship of the four switches controlled by the controller, and the controller 2 will acquire the network topology information.
  • the IP address, port number, and network topology connection relationship of the four switches are reported to the primary controller (the primary controller);
  • Step 3 The controller runs a spanning tree algorithm to calculate a fully connected and loop-free network logical connection diagram according to the physical topology connection relationship of the entire network switch.
  • Step 4 The controller compares the generated network logical connection diagram with the network physical topology connection relationship to obtain a port blocking list, where the port blocking list includes the following ports that need to be blocked: port 5 and port 7 of S3, Port 7 of S6, Port 3 of S2, Port 1 of S7, and Port 5 of S8.
  • Step 5 The controller sends a "port blocking message" through the OpenFlow protocol to notify the S3.
  • Step 6 After the switch receiving the port blocking message blocks the corresponding port, a fully connected, loop-free network is obtained.
  • the fully connected and loop-free network topology is shown in Figure 5.
  • the identified port represents the blocked port.
  • Step 7 As shown in Figure 6, when the network fails, the link between the S6 and the S7 switch is interrupted. The network topology changes, and the controller 2 re-reports the new network topology information to the controller.
  • Step 8 The main controller obtains a new topology connection diagram of the entire network according to the new network topology information obtained in step 7, re-runs the spanning tree algorithm, obtains a new logical connection diagram, compares the new logical connection diagram and the old one.
  • the logical connection diagram (ie, the logical connection diagram generated in step 4) obtains a port blocking list and a port unblocking list; the port blocking list includes the following ports that need to be blocked: port 3 of S6 and number 7 of S7 Port;
  • the port unblocking list includes the following ports that need to be unblocked: Port 1 of S7 and Port 5 of S8 are to be unblocked; the port after being unblocked will be set to the normal state.
  • Step 9 After the primary controller passes the OpenFlow protocol, the sending port revokes the blocking message or the port blocking message, and notifies S7 to revoke the port No. 1 and block port 7, notify S8 to revoke port 5, and notify S6 to block port 3.
  • the second embodiment of the present invention provides a controller.
  • the main controller includes: a topology information acquiring module 81, a topology map generating module 82, an analyzing module 83, and a processing module 84.
  • the topology information obtaining module 81 is configured to acquire overall topology information of the current network.
  • the topology map generating module 82 is configured to generate a fully connected and loop-free network topology map according to the current network overall topology information.
  • the analyzing module 83 is configured to determine, according to the current network overall topology information and the generated network topology map, a port list that needs to be blocked and/or needs to be unblocked;
  • the processing module 84 is configured to perform blocking and/or unblocking processing of the corresponding port according to the list of ports that need to be blocked and/or need to be unblocked.
  • the topology information obtaining module 81 is configured to obtain the current topology information of the entire network in the following manner:
  • second network topology information includes network topology information of all switching devices controlled by the primary controller
  • the first network topology information and the second network topology information are comprehensively analyzed to generate overall topology information of the current network.
  • the first network topology information includes: a MAC address, a port number, and a connection relationship between the switching devices of all switching devices controlled by the controller;
  • the second network topology information includes: a MAC address, a port number, and a connection relationship between the switching devices of all switching devices controlled by the primary controller.
  • the topology map generating module 82 is configured to generate a fully connected, loop-free network topology map in the following manner:
  • the topology map generation module analyzes the overall topology information of the current network according to the spanning tree algorithm, and generates a fully connected and loop-free network topology map.
  • the analysis module 83 is configured to determine a list of ports that need to be blocked and/or need to be unblocked by:
  • Condition 1 not connected to each other in the generated network topology diagram
  • Condition 2 ports that are interconnected in the overall topology of the current network
  • Condition 3 Connected to each other in the generated network topology diagram
  • Condition 4 Ports that are physically connected to each other in the current network overall topology but are not connected to each other due to congestion.
  • the processing module 84 is configured to perform blocking and/or unblocking processing of the respective ports in the following manner:
  • the processing module sends a port blocking message to the switching device where the blocked port is located to indicate that the switching device blocks the corresponding port, where the port blocking message includes the port number of the blocked port and the switching device address of the switching device to which the blocked port belongs. ;and / or,
  • the processing module sends a port unblocking message to the switching device where the blocked port is located to instruct the switching device to revoke the blocking of the corresponding port, where the port undo blocking message includes the port number of the unblocked port, and is unblocked.
  • the switching device address of the switching device to which the port belongs.
  • the topology information obtaining module 81, the topology map generating module 82, the analyzing module 83, and the processing module 84 may be configured by a central processing unit (CPU, Central Processing Unit) and a microprocessor (MPU, Micro) in the controller. Processing Unit), Digital Signal Processor (DSP) or Field-Programmable Gate Array (FPGA).
  • CPU Central Processing Unit
  • MPU Microprocessor
  • Processing Unit Digital Signal Processor
  • FPGA Field-Programmable Gate Array
  • the embodiment of the present invention further provides a computer storage medium, the storage medium comprising a set of computer executable instructions, the instructions being used to execute the software defined network implementation method according to the embodiment of the present invention.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明公开了一种软件定义网络（SDN）实现方法，主控制器获取当前网络整体拓扑信息，并根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；主控制器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，并根据所述端口列表执行相应端口的阻塞或撤销阻塞处理。本发明同时还公开了一种主控制器。

Description

一种软件定义网络实现方法、主控制器和计算机存储介质 技术领域
本发明涉及通信领域，具体涉及一种软件定义网络实现方法、主控制器和计算机存储介质。
背景技术
软件定义网络(SDN，Software Defined Network)是一种新型的网络架构，它的设计理念是将网络的控制平面与数据转发平面进行分离，并实现可编程化控制。通常，在SDN网络中，交换设备只负责单纯的数据转发，其硬件架构将趋向于统一化，其各个部件在各个厂家之间趋向于通用化。而原来负责路由、安全、策略、服务质量(QoS，Quality of Service)、流量工程等的控制平面将由专门的SDN控制器实现。一台SDN控制器控制多台SDN交换设备，SDN交换设备与SDN控制器之间通讯的协议一般是开放流(OpenFlow)协议。一个典型的SDN网络拓扑图如图1所示，在该SDN网络中包括两个控制器，每个控制器分别控制多个交换设备。
在SDN网络中，由于环路的存在，极易引起广播风暴，因此，如何有效避免网络中出现的环路，从而避免广播风暴成为亟待解决的问题。
在传统的以太网中，为了解决网络中出现环路的问题，如图2所示，通过在交换设备中引入生成树协议，将网络变成一个树状拓扑结构，避免环路的产生，但是这样要求每台交换设备上运行生成树协议，需要占用交换设备的资源，而且当网络拓扑发生变化时，所有的交换设备都需要重新计算，收敛速度比较慢。
发明内容
为了解决现有存在的技术问题，本发明实施例期望提供一种软件定义 网络实现方法、主控制器和计算机存储介质。
本发明实施例提供了一种软件定义网络SDN实现方法，所述方法包括：
主控制器获取当前网络整体拓扑信息，并根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；
主控制器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，并根据所述端口列表执行相应端口的阻塞或撤销阻塞处理。
上述方案中，所述主控制器获取当前网络整体拓扑信息包括：
主控制器接收从控制器发送的第一网络拓扑信息，所述第一网络拓扑信息包括从控制器控制的所有交换设备的网络拓扑信息；
主控制器获取自身的第二网络拓扑信息，所述第二网络拓扑信息包括主控制器控制的所有交换设备的网络拓扑信息；
主控制器综合分析第一网络拓扑信息和第二网络拓扑信息，生成当前网络整体拓扑信息。
上述方案中，所述第一网络拓扑信息，包括：从控制器控制的所有交换设备的媒体访问控制MAC地址、端口号及交换设备间的连接关系；
所述第二网络拓扑信息，包括：主控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系。
上述方案中，所述主控制器根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图，包括：主控制器依据生成树算法对当前网络整体拓扑信息进行分析，生成全连通、无环路的网络拓扑图。
上述方案中，所述主控制器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，包括：
主控制器根据当前网络整体拓扑信息确定当前网络整体拓扑结构，对比生成的网络拓扑图和当前网络整体拓扑图中所有交换设备端口的连接关系，将满足以下两个条件的端口确定为需要被阻塞的端口：
条件1：在生成的网络拓扑图中未相互连接；
条件2：在当前网络整体拓扑结构中相互连接的端口；
将满足以下两个条件的端口确定为需要撤销阻塞的端口：
条件3：在生成的网络拓扑图中相互连接；
条件4：在当前网络整体拓扑结构中物理上相互连接、但由于被堵塞而未相互连接的端口。
上述方案中，所述主控制器根据所述端口列表执行相应端口的阻塞或撤销阻塞处理，包括：
所述主控制器向被阻塞端口所在交换设备发送端口阻塞消息以指示所述交换设备阻塞相应端口，所述端口阻塞消息中包括被阻塞端口的端口号，及被阻塞端口所属交换设备的交换设备地址；和/或，
所述主控制器向被撤销阻塞端口所在交换设备发送端口撤销阻塞消息以指示所述交换设备撤销对相应端口的阻塞，所述端口撤销阻塞消息中包括被撤销阻塞端口的端口号，及被撤销阻塞端口所属交换设备的交换设备地址。
本发明实施例还提供了一种控制器，所述主控制器包括：拓扑信息获取模块、拓扑图生成模块、分析模块及处理模块；其中，
所述拓扑信息获取模块，配置为获取当前网络整体拓扑信息；
所述拓扑图生成模块，配置为根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；
所述分析模块，配置为根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表；
所述处理模块，配置为根据所述需要被阻塞和/或需要被撤销阻塞的端口列表执行相应端口的阻塞和/或撤销阻塞处理。
上述方案中，所述拓扑信息获取模块配置为通过以下方式获取当前网络整体拓扑信息：
接收从控制器发送的第一网络拓扑信息，所述第一网络拓扑信息包括从控制器控制的所有交换设备的网络拓扑信息；
获取主控制器本地的第二网络拓扑信息，所述第二网络拓扑信息包括主控制器控制的所有交换设备的网络拓扑信息；
综合分析第一网络拓扑信息和第二网络拓扑信息，生成当前网络整体拓扑信息。
上述方案中，所述第一网络拓扑信息，包括：从控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系；
所述第二网络拓扑信息，包括：主控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系。
上述方案中，所述拓扑图生成模块配置为通过以下方式生成全连通、无环路的网络拓扑图：
拓扑图生成模块依据生成树算法对当前网络整体拓扑信息进行分析，生成全连通、无环路的网络拓扑图。
上述方案中，所述分析模块配置为通过以下方式确定需要被阻塞和/或需要被撤销阻塞的端口列表：
根据当前网络整体拓扑信息确定当前网络整体拓扑结构，对比生成的网络拓扑图和当前网络整体拓扑图中所有交换设备端口的连接关系，将满足以下两个条件的端口确定为需要被阻塞的端口：
条件1：在生成的网络拓扑图中未相互连接；
条件2：在当前网络整体拓扑结构中相互连接的端口；
将满足以下两个条件的端口确定为需要撤销阻塞的端口：
条件3：在生成的网络拓扑图中相互连接；
条件4：在当前网络整体拓扑结构中物理上相互连接、但由于被堵塞而未相互连接的端口。
上述方案中，所述处理模块配置为通过以下方式执行相应端口的阻塞 和/或撤销阻塞处理：
所述处理模块向被阻塞端口所在交换设备发送端口阻塞消息以指示所述交换设备阻塞相应端口，所述端口阻塞消息中包括被阻塞端口的端口号，及被阻塞端口所属交换设备的交换设备地址；和/或，
所述处理模块向被撤销阻塞端口所在交换设备发送端口撤销阻塞消息以指示所述交换设备撤销对相应端口的阻塞，所述端口撤销阻塞消息中包括被撤销阻塞端口的端口号，及被撤销阻塞端口所属交换设备的交换设备地址。
本发明实施例还提供了一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行本发明实施例所述的软件定义网络实现方法。
本发明实施例所提供的一种软件定义网络方法、主控制器和计算机存储介质，主控制器获取当前网络整体拓扑信息，并根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；主控制器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，并根据所述端口列表执行相应端口的阻塞或撤销阻塞处理。如此，能够由主控制器对当前网络整体拓扑信息进行分析处理，生成全连通、无环路的网络拓扑图，并依据生成的网络拓扑图对当前网络拓扑结构进行调整，最终形成全连通、无环路的网络拓扑结构，由于网络中不再存在环路，从而，避免了广播风暴；另一方面，将对当前网络整体拓扑信息进行分析处理从而生成全连通、无环路的网络拓扑图的功能集成到一台主控制器上，可以大大简化交换设备的设计，降低网络成本。
附图说明
图1为现有技术中典型SDN网络基本结构图；
图2为传统SDN网络实现方案；
图3为本发明实施例提供的SDN网络实现方法基本流程图；
图4为本发明实施例提供的SDN网络拓扑结构图一；
图5为本发明实施例提供的SDN网络拓扑结构图二；
图6为本发明实施例提供的SDN网络拓扑结构图三；
图7为本发明实施例提供的SDN网络拓扑结构图四；
图8为本发明实施例提供的主控制器的基本结构图。
具体实施方式
本发明实施例中，主控制器获取当前网络整体拓扑信息，并根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；主控制器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，并根据所述端口列表执行相应端口的阻塞或撤销阻塞处理。
下面通过附图及具体实施例对本发明做进一步的详细说明。
实施例一
本发明实施例一提供了一种软件定义网络实现方法，如图3所示，该方法包括以下步骤：
步骤301：主控制器获取当前网络整体拓扑信息，并根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；
所述主控制器可以为SDN网络中的任何一台控制器，在实际实现中，可以根据多种方式确定主控制器，例如，将网络中性能最强的控制器作为主控制器，或者，将媒体访问控制(MAC，Media Access Control)地址最小的控制器作为主控制器；而SDN网络中，除主控制器外的其它控制器均被确定为从控制器。
所述主控制器获取当前网络整体拓扑信息包括：
主控制器接收从控制器发送的第一网络拓扑信息，所述第一网络拓扑 信息是指从控制器控制的所有交换设备的网络拓扑信息；
主控制器获取自身的第二网络拓扑信息，所述第二网络拓扑信息是指主控制器控制的所有交换设备的网络拓扑信息；
主控制器综合分析第一网络拓扑信息和第二网络拓扑信息，生成当前网络整体拓扑信息。
所述拓扑信息，包括：控制器(主控制器和/或从控制器)控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系。
所述主控制器根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图，包括：主控制器依据生成树算法对当前网络整体拓扑信息进行分析，生成全连通、无环路的网络拓扑图。
步骤302：主控制器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，并根据所述端口列表执行相应端口的阻塞或撤销阻塞处理。
主控制器根据当前网络整体拓扑信息确定当前网络整体拓扑结构，对比生成的网络拓扑图和当前网络整体拓扑结构，确定出需要被阻塞和/或需要被撤销阻塞的端口列表；对比生成的网络拓扑图和当前网络整体拓扑结构中所有交换设备间端口的连接关系，将满足以下两个条件的端口确定为需要被阻塞的端口：
条件1：在生成的网络拓扑图中未相互连接；
条件2：在当前网络整体拓扑结构中相互连接的端口；
将满足以下两个条件的端口确定为需要撤销阻塞的端口：
条件3：在生成的网络拓扑图中相互连接；
条件4：在当前网络整体拓扑结构中物理上相互连接、但由于被堵塞而未相互连接的端口。
举例来说，如果在生成的网络拓扑图中，交换设备1的3端口和交换设备4的7端口未相互连接，但在当前网络拓扑结构中，交换设备1的3 端口和交换设备4的7端口相互连接，则将交换设备1的3端口和交换设备4的7端口确定为需要被阻塞的端口；
如果在生成的网络拓扑图中，交换设备3的5端口和交换设备6的3端口相互连接，但是，在当前网络拓扑结构中，所述5端口和3端口虽然在物理上相互连接，但由于所述5端口和3端口被堵塞而使这两个端口不能相互连接，则将交换设备3的5端口和交换设备6的3端口确定为需要撤销堵塞的端口。
如果主控制器对比生成的网络拓扑图和当前网络整体拓扑结构之后，确定生成的网络拓扑图和当前网络整体拓扑结构相同时，则确定不存在需要被阻塞或需要被撤销阻塞的端口列表。
当需要被阻塞和/或需要被撤销阻塞的端口列表确定之后，主控制器向被阻塞端口所在交换设备发送端口阻塞消息，所述端口阻塞消息中包括被阻塞端口的端口号，及被阻塞端口所属交换设备的交换设备地址；和/或，
主控制器向被撤销阻塞端口所在交换设备发送端口撤销阻塞消息，所述端口撤销阻塞消息中包括被撤销阻塞端口的端口号，及被撤销阻塞端口所属交换设备的交换设备地址。
所述端口阻塞消息或端口撤销阻塞消息可以为OpenFlow协议消息；
接收到上述端口阻塞消息的交换设备，根据所述端口阻塞消息中的端口号，查找并阻塞相应端口号的端口；
接收到上述端口撤销阻塞消息的交换设备，根据所述端口撤销阻塞消息中的端口号，查找并对相应端口号的端口撤销阻塞。
当任意从控制器所控制的交换设备的拓扑信息发生变化时，主控制器接收该从控制器发送的更新后的拓扑信息，根据更新后的拓扑信息，重新生成新的网络拓扑图，从而对比新的网络拓扑图和之前生成的网络拓扑图，确定需要被阻塞或撤销阻塞的端口列表，并根据所述端口列表执行相应端口的阻塞或撤销阻塞处理；这样，通过本发明实施例提供的方法，当网络 拓扑结构发送变化时，仅需要主控制器及分管发生变化的那一部分网络拓扑结构的从控制器参与网络拓扑结构的更新，可以提高网络拓扑结构的更新速率，并简化其它从控制器的工作量。
下面结合附图4-图7对本发明实施例提供的软件定义网络实现方法做详细介绍。
如图4所示的SDN网络基本拓扑结构，SDN网络中有两台控制器，八台交换机，其中控制器一控制四台交换机，这四台交换机分别被标识为S1、S2、S3及S4，控制器二控制另外四台，分别是S5、S6、S7及S8。控制器与交换机之间通过百兆以太网(FE)连接，传递OpenFlow协议报文与广播消息。交换机之间通过万兆以太网(10GE)连接，传递业务报文与OpenFlow协议报文。
本示例实施步骤：
步骤1：将两台控制器中的控制器一设置为主控制器，控制整个网络中的所有设备。
步骤2：控制器一、二分别获取其控制的四台交换机的网络拓扑信息，该网络拓扑信息包括其控制的四台交换机的IP地址、端口号及网络拓扑连接关系，控制器二将获取的四台交换机的IP地址、端口号及网络拓扑连接关系上报给主控制器一(主控制器)；
步骤3：控制器一根据全网络交换机的物理拓扑连接关系，运行生成树算法计算出一个全连通、无环路的网络逻辑连接图；
步骤4：控制器一对比所述生成的网络逻辑连接图和网络物理拓扑连接关系，得到端口阻塞列表，该端口阻塞列表中包括以下需要被阻塞的端口：S3的5号端口与7号端口、S6的7号端口、S2的3号端口、S7的1号端口、S8的5号端口。
步骤5：控制器一通过OpenFlow协议发出“端口阻塞消息”，通知S3 交换机阻塞5号端口与7号端口、S6交换机阻塞7号端口、S2交换机阻塞3号端口、S7交换机阻塞1号端口、S8交换机阻塞5号端口。
步骤6：接收到端口阻塞消息的交换机阻塞相应端口之后，就得到了一个全连通、无环路的网络，所述全连通、无环路的网络拓扑结构如图5所示，图中①符号标识的端口表示被堵塞的端口。
步骤7：如图6所示，当网络发生故障，S6与S7交换机之间链路中断。网络拓扑发生变化，控制器二重新向控制器一上报新的网络拓扑信息。
步骤8：主控制器一根据步骤7中得到的新的网络拓扑信息得到整个网络的新的拓扑连接图，重新运行生成树算法，得到新的逻辑连接图，对比新的逻辑连接图和旧的逻辑连接图(即，步骤4中生成的逻辑连接图)，得到端口阻塞列表和端口撤销阻塞列表；所述端口阻塞列表中包括以下需要被阻塞的端口：S6的3号端口与S7的7号端口；端口撤销阻塞列表中包括以下需要被撤销阻塞的端口：S7的1号端口与S8的5号端口要撤销阻塞；被撤销阻塞之后的端口将被设置为正常状态。
步骤9：主控制器一通过OpenFlow协议，发送端口撤销阻塞消息或端口阻塞消息，通知S7撤销阻塞1号端口并阻塞7号端口、通知S8撤销阻塞5号端口、通知S6阻塞3号端口。
这样，经过步骤7、8、9之后，就重新得到了一个全连通、无环路的SDN网络，如图7所示，相较于图5，原本的阻塞端口中，撤销了对S8的5号端口和S7的1号端口的阻塞，并增加了对S8的5号端口及S6的3号端口的阻塞。
实施例二
本发明实施例二提供了一种控制器，如图8所示，所述主控制器包括：拓扑信息获取模块81、拓扑图生成模块82、分析模块83及处理模块84；其中，
所述拓扑信息获取模块81，配置为获取当前网络整体拓扑信息；
所述拓扑图生成模块82，配置为根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；
所述分析模块83，配置为根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表；
所述处理模块84，配置为根据所述需要被阻塞和/或需要被撤销阻塞的端口列表执行相应端口的阻塞和/或撤销阻塞处理。
所述拓扑信息获取模块81配置为通过以下方式获取当前网络整体拓扑信息：
接收从控制器发送的第一网络拓扑信息，所述第一网络拓扑信息包括从控制器控制的所有交换设备的网络拓扑信息；
获取主控制器本地的第二网络拓扑信息，所述第二网络拓扑信息包括主控制器控制的所有交换设备的网络拓扑信息；
综合分析第一网络拓扑信息和第二网络拓扑信息，生成当前网络整体拓扑信息。
其中，所述第一网络拓扑信息，包括：从控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系；
所述第二网络拓扑信息，包括：主控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系。
所述拓扑图生成模块82配置为通过以下方式生成全连通、无环路的网络拓扑图：
拓扑图生成模块依据生成树算法对当前网络整体拓扑信息进行分析，生成全连通、无环路的网络拓扑图。
所述分析模块83配置为通过以下方式确定需要被阻塞和/或需要被撤销阻塞的端口列表：
根据当前网络整体拓扑信息确定当前网络整体拓扑结构，对比生成的 网络拓扑图和当前网络整体拓扑图中所有交换设备端口的连接关系，将满足以下两个条件的端口确定为需要被阻塞的端口：
条件1：在生成的网络拓扑图中未相互连接；
条件2：在当前网络整体拓扑结构中相互连接的端口；
将满足以下两个条件的端口确定为需要撤销阻塞的端口：
条件3：在生成的网络拓扑图中相互连接；
条件4：在当前网络整体拓扑结构中物理上相互连接、但由于被堵塞而未相互连接的端口。
所述处理模块84配置为通过以下方式执行相应端口的阻塞和/或撤销阻塞处理：
所述处理模块向被阻塞端口所在交换设备发送端口阻塞消息以指示所述交换设备阻塞相应端口，所述端口阻塞消息中包括被阻塞端口的端口号，及被阻塞端口所属交换设备的交换设备地址；和/或，
所述处理模块向被撤销阻塞端口所在交换设备发送端口撤销阻塞消息以指示所述交换设备撤销对相应端口的阻塞，所述端口撤销阻塞消息中包括被撤销阻塞端口的端口号，及被撤销阻塞端口所属交换设备的交换设备地址。
在具体实施过程中，上述拓扑信息获取模块81、拓扑图生成模块82、分析模块83及处理模块84可以由控制器内的中央处理器(CPU，Central Processing Unit)、微处理器(MPU，Micro Processing Unit)、数字信号处理器(DSP，Digital Signal Processor)或可编程逻辑阵列(FPGA，Field－Programmable Gate Array)来实现。
本发明实施例还提供了一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行本发明实施例所述的软件定义网络实现方法。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。

Claims (13)

  1. 一种软件定义网络实现方法，所述方法包括：
    主控制器获取当前网络整体拓扑信息，并根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；
    主控制器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，并根据所述端口列表执行相应端口的阻塞或撤销阻塞处理。
  2. 根据权利要求1所述的方法，其中，所述主控制器获取当前网络整体拓扑信息包括：
    主控制器接收从控制器发送的第一网络拓扑信息，所述第一网络拓扑信息包括从控制器控制的所有交换设备的网络拓扑信息；
    主控制器获取自身的第二网络拓扑信息，所述第二网络拓扑信息包括主控制器控制的所有交换设备的网络拓扑信息；
    主控制器综合分析第一网络拓扑信息和第二网络拓扑信息，生成当前网络整体拓扑信息。
  3. 根据权利要求2所述的方法，其中，所述第一网络拓扑信息，包括：从控制器控制的所有交换设备的媒体访问控制MAC地址、端口号及交换设备间的连接关系；
    所述第二网络拓扑信息，包括：主控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系。
  4. 根据权利要求1至3其中任一项所述的方法，其中，所述主控制器根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图，包括：主控制器依据生成树算法对当前网络整体拓扑信息进行分析，生成全连通、无环路的网络拓扑图。
  5. 根据权利要求1至3其中任一项所述的方法，其中，所述主控制 器根据当前网络整体拓扑信息和生成的网络拓扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表，包括：
    主控制器根据当前网络整体拓扑信息确定当前网络整体拓扑结构，对比生成的网络拓扑图和当前网络整体拓扑图中所有交换设备端口的连接关系，将满足以下两个条件的端口确定为需要被阻塞的端口：
    条件1：在生成的网络拓扑图中未相互连接；
    条件2：在当前网络整体拓扑结构中相互连接的端口；
    将满足以下两个条件的端口确定为需要撤销阻塞的端口：
    条件3：在生成的网络拓扑图中相互连接；
    条件4：在当前网络整体拓扑结构中物理上相互连接、但由于被堵塞而未相互连接的端口。
  6. 根据权利要求5所述的方法，其中，所述主控制器根据所述端口列表执行相应端口的阻塞或撤销阻塞处理，包括：
    所述主控制器向被阻塞端口所在交换设备发送端口阻塞消息以指示所述交换设备阻塞相应端口，所述端口阻塞消息中包括被阻塞端口的端口号，及被阻塞端口所属交换设备的交换设备地址；和/或，
    所述主控制器向被撤销阻塞端口所在交换设备发送端口撤销阻塞消息以指示所述交换设备撤销对相应端口的阻塞，所述端口撤销阻塞消息中包括被撤销阻塞端口的端口号，及被撤销阻塞端口所属交换设备的交换设备地址。
  7. 一种控制器，所述主控制器包括：拓扑信息获取模块、拓扑图生成模块、分析模块及处理模块；其中，
    所述拓扑信息获取模块，配置为获取当前网络整体拓扑信息；
    所述拓扑图生成模块，配置为根据当前网络整体拓扑信息生成全连通、无环路的网络拓扑图；
    所述分析模块，配置为根据当前网络整体拓扑信息和生成的网络拓 扑图，确定需要被阻塞和/或需要被撤销阻塞的端口列表；
    所述处理模块，配置为根据所述需要被阻塞和/或需要被撤销阻塞的端口列表执行相应端口的阻塞和/或撤销阻塞处理。
  8. 根据权利要求7所述的主控制器，其中，所述拓扑信息获取模块配置为通过以下方式获取当前网络整体拓扑信息：
    接收从控制器发送的第一网络拓扑信息，所述第一网络拓扑信息包括从控制器控制的所有交换设备的网络拓扑信息；
    获取主控制器本地的第二网络拓扑信息，所述第二网络拓扑信息包括主控制器控制的所有交换设备的网络拓扑信息；
    综合分析第一网络拓扑信息和第二网络拓扑信息，生成当前网络整体拓扑信息。
  9. 根据权利要求8所述的主控制器，其中，所述第一网络拓扑信息，包括：从控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系；
    所述第二网络拓扑信息，包括：主控制器控制的所有交换设备的MAC地址、端口号及交换设备间的连接关系。
  10. 根据权利要求7至9其中任一项所述的主控制器，其中，所述拓扑图生成模块配置为通过以下方式生成全连通、无环路的网络拓扑图：
    拓扑图生成模块依据生成树算法对当前网络整体拓扑信息进行分析，生成全连通、无环路的网络拓扑图。
  11. 根据权利要求7至9其中任一项所述的主控制器，其中，所述分析模块配置为通过以下方式确定需要被阻塞和/或需要被撤销阻塞的端口列表：
    根据当前网络整体拓扑信息确定当前网络整体拓扑结构，对比生成的网络拓扑图和当前网络整体拓扑图中所有交换设备端口的连接关系，将满足以下两个条件的端口确定为需要被阻塞的端口：
    条件1：在生成的网络拓扑图中未相互连接；
    条件2：在当前网络整体拓扑结构中相互连接的端口；
    将满足以下两个条件的端口确定为需要撤销阻塞的端口：
    条件3：在生成的网络拓扑图中相互连接；
    条件4：在当前网络整体拓扑结构中物理上相互连接、但由于被堵塞而未相互连接的端口。
  12. 根据权利要求11所述的主控制器，其中，所述处理模块配置为通过以下方式执行相应端口的阻塞和/或撤销阻塞处理：
    所述处理模块向被阻塞端口所在交换设备发送端口阻塞消息以指示所述交换设备阻塞相应端口，所述端口阻塞消息中包括被阻塞端口的端口号，及被阻塞端口所属交换设备的交换设备地址；和/或，
    所述处理模块向被撤销阻塞端口所在交换设备发送端口撤销阻塞消息以指示所述交换设备撤销对相应端口的阻塞，所述端口撤销阻塞消息中包括被撤销阻塞端口的端口号，及被撤销阻塞端口所属交换设备的交换设备地址。
  13. 一种计算机存储介质，所述存储介质包括一组计算机可执行指令，所述指令用于执行权利要求1-6任一项所述的软件定义网络实现方法。
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