WO2018120966A1 - 一种多通道网络切换方法和系统 - Google Patents

一种多通道网络切换方法和系统 Download PDF

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Publication number
WO2018120966A1
WO2018120966A1 PCT/CN2017/105022 CN2017105022W WO2018120966A1 WO 2018120966 A1 WO2018120966 A1 WO 2018120966A1 CN 2017105022 W CN2017105022 W CN 2017105022W WO 2018120966 A1 WO2018120966 A1 WO 2018120966A1
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link
packet
terminals
active link
data
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PCT/CN2017/105022
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English (en)
French (fr)
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董铁城
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广州华多网络科技有限公司
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Publication of WO2018120966A1 publication Critical patent/WO2018120966A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/24—Multipath
    • H04L45/247—Multipath using M:N active or standby paths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/22—Alternate routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/302—Route determination based on requested QoS

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  • the present invention relates to the field of information technology, and in particular, to a multi-channel network switching method and system.
  • the solution currently adopted is to use the dual-line access of the IDC room network, that is, to access different Internet access providers (ISPs) services through special technical means, such as accessing China Unicom and China Telecom services at the same time.
  • ISPs Internet access providers
  • the technical problem to be solved by the present invention is to provide a multi-channel network switching method and system, which can ensure network transmission quality.
  • a technical solution adopted by the present invention is to provide a multi-channel network switching method, which includes: respectively setting a software defined network (SDN) module in two terminals, respectively Virtual network card information is configured in the two terminals, where the virtual network card information includes a virtual IP address, and the two terminals are respectively installed with Applying software, and at least two physical IP communication links are disposed between the two terminals, and the two terminals respectively have a corresponding physical IP address corresponding to each of the physical IP communication links,
  • the application software in the two terminals invokes the virtual IP addresses of the two terminals, and the SDN module according to the virtual IP address of each of the terminals and the physical IP corresponding to each of the physical IP communication links Routing information is constructed by mapping between addresses; one of the at least two physical IP communication links acts as an active link, and the other links act as backup links; the current active link is retrieved Communicating between two terminals; the SDN module monitors communication states of the at least two physical IP communication links to determine whether the current communication quality
  • the SDN module monitors a communication status of the at least two physical IP communication links to determine whether a current communication quality of the active link meets a predetermined communication standard; when determining a current communication of the active link When the quality does not reach the predetermined communication standard, the SDN module switches to the standby link whose communication quality reaches the predetermined communication standard, and uses the switched standby link as the current active link to
  • the communication between the two terminals includes: periodically sending a heartbeat packet to the remote end, and the remote end returns a heartbeat packet after receiving the heartbeat packet; and according to the received heartbeat packet, the real-time statistics distance is current.
  • a network failure rate of the active link and the standby link within a predetermined time if the network failure rate of the active link is greater than the predetermined communication standard, further determining the location of the standby link Whether the network defect rate is less than the predetermined communication standard, and if so, switching the standby link to the current active link to communicate between the two terminals.
  • the network failure rate is the sum of the network delay rate occupying the first weight and the packet loss rate occupying the second weight, and the sum of the first weight and the second weight is 1.
  • the SDN module switches to the standby link whose communication quality reaches the predetermined communication standard, and after the handover
  • the standby link acts as a current active link to communicate between the two terminals, and further includes: after the handover, to switch the current
  • the active link transmits and receives data between the two terminals, and the current active link before handover continues to receive data between the two terminals to avoid packet loss.
  • the data is sent between the two terminals by using the current active link after the handover, where the data to be sent of the application software enters a first protocol stack, and the first protocol stack is Transmitting, by the first data packet encapsulation and the inner layer IP packet encapsulation, the first data packet is obtained, and the first data packet is sent to the SDN module by using a virtual network card of the current data sending terminal; Receiving, by the SDN module, the first data packet, reading the encapsulated inner IP packet header, routing, and sending the packet to the second protocol stack; and the second protocol stack performing the second protocol packet on the first data packet Encapsulating and outer IP packet encapsulation, thereby obtaining a second data packet, and sending the second data packet through a physical network card of the data transmitting terminal, thereby completing data transmission.
  • the data is received between the two terminals by using the current active link after the handover, and the current active link before the handover continues to receive data between the two terminals, including: Receiving, by the physical network card of the current active link after the handover or the data receiving terminal of the current active link before the handover, the second data packet, and transmitting the second data packet to the second protocol stack
  • the second protocol stack decapsulates the outer IP packet and the second protocol packet of the second data packet to obtain the first data packet;
  • the SDN module reads the first data packet An inner layer IP packet header of a data packet, and transmitting the first data packet to the first protocol stack by using a virtual network card of the data receiving terminal, where the first protocol stack pairs the first data
  • the inner layer IP packet of the packet and the protocol packet are decapsulated, and the application software performs data reading.
  • another technical solution adopted by the present invention is to provide a multi-channel network switching system, where the switching system includes an application software and an SDN module, and the SDN module includes: a data transmission sub-module, Establishing at least two physical IP communication links, and one of the at least two physical IP communication links is an active link, the other links are standby links, and the active link is a normal communication link; a routing management submodule, configured to configure virtual network card information, where the virtual network card information includes a virtual IP address; and mapping between each virtual IP address and a physical IP address corresponding to each of the physical IP communication links And constructing routing information; monitoring sub-module for presenting according to monitoring and judgment Whether the communication quality of the active link reaches a predetermined communication standard; the switching submodule is configured to switch from the current active link to a communication quality when it is determined that the communication quality of the active link does not reach the predetermined communication standard The standby link of the predetermined communication standard, and the switched standby link is used as a current
  • the application software invokes the virtual IP address to communicate through the route management submodule.
  • the monitoring sub-module includes a sending unit and a determining unit, and the sending unit periodically sends a heartbeat packet to the remote end, and the remote end sends back a heartbeat packet after receiving the heartbeat packet; Returning the heartbeat packet to the real-time statistics of the network failure rate of the active link and the standby link within a current predetermined time; if the current network failure rate of the active link is greater than the Determining a communication standard, and the current network failure rate of the standby link is less than the predetermined communication standard, sending a first signal to the switching submodule; the switching submodule receiving the first signal, and further switching And the standby link with the communication quality reaching the predetermined communication standard, and the switched standby link is used as the current active link.
  • the monitoring sub-module further includes a computing unit, where the computing unit is configured to calculate the network defect rate, where the network defect rate is calculated by occupying a first weighted network delay rate and occupying a second weighted packet loss The sum of the rates, the sum of the first weight and the second weight is 1.
  • the data transmission sub-module is further configured to establish a communication channel with the application software, and establish a communication channel with the remote end.
  • the SDN module monitors the virtual network card information in the two terminals by using the SDN module respectively disposed in the two terminals, and the SDN module monitors at least between the two terminals, at least one aspect of the present invention.
  • the communication state of the two physical IP communication links is switched so that the active link of the normal communication is matched to the link with the best communication state, thereby ensuring the quality of the network communication; and the application software in the terminal is virtualized by calling the virtual network card
  • the IP address is used to implement communication in the network without knowing the specific physical IP communication link used by the IP address, thereby ensuring the network communication quality of the application software.
  • the active link is always in the state of transmitting and receiving data
  • the standby link is always in the state of receiving data.
  • the data receiving terminal can always receive data that is not transmitted in time, thereby reducing the packet loss rate of the data transmission.
  • FIG. 1 is a schematic flow chart of an embodiment of a multi-channel network switching method according to the present invention
  • FIG. 2 is a schematic flowchart of a data transmission of an active link of the present invention and a schematic diagram of a data packet;
  • FIG. 3 is a schematic flowchart of data received by an active link and a standby link according to the present invention, and a schematic diagram of data packet decapsulation;
  • FIG. 4 is a schematic structural diagram of an implementation manner of an SDN module of a multi-channel network switching system according to the present invention.
  • FIG. 5 is a schematic structural diagram of the monitoring submodule of FIG. 4.
  • FIG. 1 is a schematic flowchart of an embodiment of a multi-channel network switching method according to the present invention, including:
  • a software defined network (SDN) module is configured in the two terminals to configure virtual network card information in the two terminals respectively.
  • the virtual network card information includes a virtual IP address, and the two terminals are respectively installed.
  • Application software, and at least two physical IP communication links are disposed between the two terminals, and the two terminals respectively have a corresponding physical IP address corresponding to each physical IP communication link, and the application software in the two terminals is called.
  • the virtual IP address of the two terminals, and the SDN module constructs routing information according to the mapping between the virtual IP address of each terminal and the physical IP address corresponding to each physical IP communication link; at least two physical IP communication links One of the links acts as the active link and the other links act as the standby link;
  • the implementation manner of setting at least two communication links between the two terminals is to install at least two physical network cards on the terminal, and the physical network cards are respectively connected to other network access providers such as telecommunications, China Unicom, or mobile, and set Its corresponding physical IP address; at the same time, a physical IP address routing table is added to the two terminals to implement communication link setting.
  • network access providers such as telecommunications, China Unicom, or mobile
  • the SDN module is separately set in the two terminals, and the SDN module is initially initialized in its corresponding terminal.
  • the virtual network card is configured, and the information of the virtual network card is configured, including the virtual IP address and the maximum transmission unit (MTU).
  • the SDN module constructs a mapping between the virtual IP address and the physical IP address, and creates routing information, which can be queried and updated in time.
  • the SDN module establishes a communication channel with the remote end.
  • the communication channel is a UDP (user datagram protocol) channel. In other application scenarios, it may be a channel based on other protocols; Through the file interface, establish a communication channel with the virtual network card of the terminal.
  • the application software directly invokes the virtual IP address communication of the SDN module, without knowing which physical IP communication link is specifically linked by the SDN module.
  • the current active link transmits and receives data between the two terminals, while the current remaining standby link receives data between the two terminals.
  • FIG. 2(a) is a schematic flowchart of data transmission of an active link according to the present invention
  • FIG. 2(b) is a schematic diagram of data to be transmitted.
  • the process of sending data by the active link is: the data to be sent of the application software enters the first protocol stack 201, and the first protocol stack 201 performs first protocol packet encapsulation and inner layer IP packet encapsulation on the data to be sent, thereby obtaining the first data packet, and
  • the first data packet is sent to the SDN module 203 through the virtual network card 202 of the current data sending terminal.
  • the first protocol stack 201 performs TCP protocol encapsulation on the data to be sent.
  • the UDP may also be used.
  • the SDN module 203 reads the inner IP packet header information, performs routing, and sends the information to the second protocol stack 204; the second protocol stack 204 performs the second protocol packet on the first data packet. Encapsulating and outer IP packet encapsulation, thereby obtaining a second data packet, and transmitting the second data packet through the physical network card of the data transmitting terminal, thereby completing data transmission, and the second data packet is transmitted over the Internet through the outer IP packet header, and Receiving the specified receiving terminal according to the routing information; in an application scenario, the second protocol packet is encapsulated according to the UDP protocol encapsulation, and in other application scenarios, the base may be Other agreements.
  • FIG. 3(a) is a schematic flowchart of receiving data of an active link or a standby link according to the present invention
  • FIG. 3(b) is a schematic diagram of decapsulating data to be received.
  • the method for receiving data by the active link or the standby link includes: the data receiving end of the active link or the standby link, the physical network card 205 receiving the second data packet through the outer IP packet header of the second data packet, and the second data packet Transmitted to the second protocol stack 204; the second protocol stack 204 feeds the outer IP packet and the second protocol packet of the second data packet Decapsulating, and then obtaining the first data packet; the SDN module 203 reads the inner IP packet header of the first data packet, and transmits the first data packet to the first protocol stack 201 through the virtual network card 202 of the data receiving terminal, A protocol stack 201 decapsulates the inner IP packet and the protocol packet of the first data packet, thereby completing data reception.
  • the first protocol stack 201 and the second protocol stack 204 may be the same or different.
  • the SDN module monitors a communication state of at least two physical IP communication links to determine whether a communication quality of the current active link meets a predetermined communication standard.
  • the heartbeat packet is periodically sent to the remote end, and the remote end receives the heartbeat packet and sends back a reply heartbeat packet.
  • the network bad rate of the active link and the standby link within the current predetermined time is collected in real time.
  • the network defect rate is the sum of the network delay rate occupying the first weight and the packet loss rate occupying the second weight, and the sum of the first weight and the second weight is 1.
  • the heartbeat packet is sent to the remote server every interval of 1 ms, and the remote server sends back a heartbeat packet after receiving the heartbeat packet; the SDN module collects the activity within the past 5 minutes according to the received heartbeat packet.
  • Network failure rate for links and alternate links According to statistics, the network delay rate of the current active link is 80%, and the packet loss rate is 90%. The network delay rate of a current standby link is 30%, and the packet loss rate is 20%.
  • the first weight is 30%, and the second weight is 70%.
  • the SDN module When it is determined that the communication quality of the current active link does not reach the predetermined communication standard, the SDN module switches to a standby link whose communication quality reaches a predetermined communication standard, and uses the switched standby link as the current active link. Communicate between two terminals;
  • the network failure rate of the current active link is greater than a predetermined communication standard, and the network failure rate of the current standby link is less than a predetermined communication standard, then a standby link is switched to the current active link to be at the two terminals. Communicate between.
  • the current live The network defect rate of the dynamic link is 0.51.
  • the current network defect rate of a certain standby link is 0.23, and the predetermined communication standard is 0.3.
  • the SDN module switches the above one standby link to the active link, and the current The active link switches to the alternate link.
  • the predetermined communication standard can be set according to actual needs.
  • one of them may be selected or one of the alternate links with the best communication state may be selected to switch to the active link. .
  • the current active link after the handover transmits and receives data between the two terminals, and the current active link before the handover continues to receive data between the two terminals to avoid the occurrence of packet loss.
  • the process of transmitting and receiving data is the same as that in the above step S102, and details are not described herein again.
  • the multi-channel network switching system provided by the present invention includes an application software and an SDN module.
  • FIG. 4 is a schematic structural diagram of an implementation manner of an SDN module of a multi-channel network switching system according to the present invention.
  • the SDN module includes a routing management sub-module 401.
  • the data transmission sub-module 402 is configured to establish at least two physical IP communication links, and one of the at least two physical IP communication links serves as an active link, and the other links serve as a backup link, and the active link
  • the road is a normal communication link; it is also used to establish a communication channel with the application software, and establish a communication channel with the remote end;
  • the routing management sub-module 401 is configured to configure virtual network card information, where the virtual network card information includes a virtual IP address, and the route is constructed according to a mapping between each virtual IP address and a physical IP address corresponding to each physical IP communication link. information;
  • the monitoring submodule 403 is configured to monitor and determine whether the communication quality of the currently active link reaches a predetermined communication standard.
  • the switching sub-module 404 is configured to, when determining that the communication quality of the currently active link does not reach the predetermined communication standard, switch from the current active link to a standby link whose communication quality reaches a predetermined communication standard, and use the backup after the handover.
  • the link acts as the current active link;
  • the application software communicates according to the routing management submodule 401 by calling a virtual IP address.
  • FIG. 5 is a schematic structural diagram of the monitoring submodule in FIG. 4.
  • the monitoring submodule 403 includes a sending unit 501 and a determining unit 503, and a sending unit 501.
  • the heartbeat packet is periodically sent to the remote end, and the remote end sends back the heartbeat packet after receiving the heartbeat packet.
  • the determining unit 503 collects the network of the active link and the standby link in the current predetermined time according to the received heartbeat packet.
  • the failure rate is: if the network failure rate of the currently active link is greater than the predetermined communication standard, and the network failure rate of the current standby link is less than the predetermined communication standard, the first signal is sent to the switching submodule 404; the switching submodule 404 receives the first signal.
  • the monitoring sub-module 403 further includes a calculating unit 502, configured to calculate a network defect rate, and send the calculation result to the determining unit 503 in real time, and the network defect rate is calculated by the first weighting network.
  • the sum of the delay rate and the packet loss rate of the second weight, the sum of the first weight and the second weight is 1.
  • the present invention configures virtual NIC information in two terminals by using SDN modules respectively set in two terminals, and the SDN module monitors at least two between two terminals.
  • the communication state of the physical IP communication link is switched so that the active link of the normal communication is matched to the link with the best communication state, thereby ensuring the network communication quality; and the application software in the terminal calls the virtual IP address of the virtual network card by calling the virtual network address of the virtual network card.
  • the active link is always in the state of transmitting and receiving data
  • the standby link is always in the state of receiving data.
  • the data receiving terminal can always Receive data that is not transmitted in time, thereby reducing the packet loss rate of data transmission.

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Abstract

本发明公开了一种多通道网络切换方法和系统，该方法包括：分别在两个终端中设置SDN模块，以分别在两个终端内配置虚拟IP地址，两个终端内分别安装有应用软体，且两个终端之间设置有至少两个物理IP通信链路，而两个终端对应于每个物理IP通信链路分别具有一个对应的物理IP地址，两个终端内的应用软体调用两个终端的虚拟IP地址，而SDN模块根据每个终端的虚拟IP地址和每个物理IP通信链路所对应的物理IP地址之间的映射构建路由信息；至少两个物理IP通信链路中的一个链路作为活动链路，其它链路作为备用链路；SDN模块监控至少两个物理IP通信链路的通信状态，切换以使活动链路匹配到通信状态较佳的通信链路上。通过上述方式，本发明能够保证网络传输质量。

Description

一种多通道网络切换方法和系统 技术领域
本发明涉及信息技术领域，特别是涉及一种多通道网络切换方法和系统。
背景技术
当运营商IP网络发生割接、拥塞或者故障时，异地互联网数据中心(IDC)机房之间网络吞吐量下降非常严重，甚至会引起网络连接中断。目前常采用的解决方案是将IDC机房网络采用双线接入，即通过特殊的技术手段，同时接入不同的网络接入商(ISP)的服务，例如同时接入中国联通和中国电信服务。
如今，一些企业或者政府部门对接入互联网的可靠性要求越来越高。目前急需解决的问题是在满足双线接入备份的同时，也要求当单条连入ISP的线路出现故障之后，访问互联网的流量自动切换到另一备份线路上，从而实现网络接入的可靠性和故障的快速恢复性。但是，现有技术中由于从一种网络切换至另一种网络的时候，而终端上的应用软体在网络切换后，其需要重新识别切换后的网络，因此，其容易造成数据延迟、丢包等现象的发生，难以实现两种网络的无缝切换。
发明内容
本发明主要解决的技术问题是提供一种多通道网络切换方法和系统，能够保证网络传输质量。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种多通道网络切换方法，包括：分别在两个终端中设置软件定义网络(software defined network,SDN)模块，以分别在所述两个终端内配置虚拟网卡信息，其中，所述虚拟网卡信息包括虚拟IP地址，所述两个终端内分别安装有 应用软体，且所述两个终端之间设置有至少两个物理IP通信链路，而所述两个终端对应于每个所述物理IP通信链路分别具有一个对应的物理IP地址，所述两个终端内的所述应用软体调用所述两个终端的虚拟IP地址，而所述SDN模块根据每个所述终端的虚拟IP地址和每个所述物理IP通信链路所对应的物理IP地址之间的映射而构建路由信息；所述至少两个物理IP通信链路中的一个链路作为活动链路，其它链路作为备用链路；调取当前的所述活动链路而在所述两个终端之间进行通信；所述SDN模块监控所述至少两个物理IP通信链路的通信状态，以判断当前的所述活动链路的通信质量是否达到预定通信标准；当确定当前的所述活动链路的通信质量未达到所述预定通信标准时，则所述SDN模块切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路以在所述两个终端之间进行通信。
其中，所述SDN模块监控所述至少两个物理IP通信链路的通信状态，以判断当前的所述活动链路的通信质量是否达到预定通信标准；当确定当前的所述活动链路的通信质量未达到所述预定通信标准时，则所述SDN模块切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路以在所述两个终端之间进行通信包括：周期性发送心跳包到远端，所述远端收到所述心跳包后返回回复心跳包；根据收到的所述回复心跳包，实时统计距当前预定时间内的所述活动链路和所述备用链路的网络不良率；若当前所述活动链路的所述网络不良率大于所述预定通信标准，则进一步判断所述备用链路的所述网络不良率是否小于所述预定通信标准，若是则将所述备用链路切换为当前的活动链路以在所述两个终端之间进行通信。
其中，所述网络不良率为占第一权重的网络延迟率和占第二权重的丢包率之和，所述第一权重与所述第二权重之和为1。
其中，当确定当前的所述活动链路的通信质量未达到所述预定通信标准时，则所述SDN模块切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路以在所述两个终端之间进行通信，进一步包括：在切换后，以切换后的当前的 活动链路在所述两个终端之间发送和接收数据，且切换前的当前的活动链路继续在所述两个终端之间接收数据，以避免丢包现象的发生。
其中，所述在切换后，以切换后的当前的活动链路在所述两个终端之间发送数据包括：所述应用软体的待发送数据进入第一协议栈，所述第一协议栈对所述待发送数据进行第一协议包封装和内层IP包封装，从而获得第一数据包，并将所述第一数据包通过当前数据发送终端的虚拟网卡发送至所述SDN模块；所述SDN模块接收所述第一数据包，读取封装后所述内层IP包首部，进行路由，发送至第二协议栈；所述第二协议栈对所述第一数据包进行第二协议包封装和外层IP包封装，从而获得第二数据包，并通过数据发送终端的物理网卡将所述第二数据包发出，进而完成数据发送。
其中，所述在切换后，以切换后的当前的活动链路在所述两个终端之间接收数据，且切换前的当前的活动链路继续在所述两个终端之间接收数据包括：所述切换后的当前活动链路或所述切换前的当前活动链路的数据接收终端的物理网卡接收所述第二数据包，并将所述第二数据包传输至所述第二协议栈，所述第二协议栈对所述第二数据包的所述外层IP包和所述第二协议包进行解封，进而得到所述第一数据包；所述SDN模块读取所述第一数据包的所述内层IP包首部，并将所述第一数据包通过所述数据接收终端的虚拟网卡传输至所述第一协议栈，所述第一协议栈对所述第一数据包的所述内层IP包和所述协议包进行解封，所述应用软体进行数据读取。
为解决上述技术问题，本发明采用的另一个技术方案是：提供提供一种多通道网络切换系统，所述切换系统包括应用软体和SDN模块，所述SDN模块包括：数据传输子模块，用于建立至少两个物理IP通信链路，且所述至少两个物理IP通信链路中的一个链路作为活动链路，其它链路作为备用链路，所述活动链路为正常通信链路；路由管理子模块，用于配置虚拟网卡信息，其中，所述虚拟网卡信息包括虚拟IP地址；根据每个虚拟IP地址和每个所述物理IP通信链路所对应的物理IP地址之间的映射而构建路由信息；监控子模块，用于根据监控和判断当前所述 活动链路的通信质量是否达到预定的通信标准；切换子模块，用于当确定当前所述活动链路的通信质量未达到预定通信标准的时候，从当前的活动链路切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路；
所述应用软体通过路由管理子模块调用所述虚拟IP地址进行通信。
其中，所述监控子模块包括发送单元、判断单元，所述发送单元周期性发送心跳包到远端，所述远端收到所述心跳包后发回回复心跳包；所述判断单元根据收到的所述回复心跳包，实时统计距当前预定时间内的所述活动链路和所述备用链路的所述网络不良率；若当前所述活动链路的所述网络不良率大于所述预定通信标准，且当前所述备用链路的所述网络不良率小于所述预定通信标准，则发送第一信号至所述切换子模块；所述切换子模块接收所述第一信号，进而切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路。
其中，所述监控子模块进一步包括计算单元，所述计算单元用于计算所述网络不良率，所述网络不良率的计算方法为占第一权重的网络延迟率和占第二权重的丢包率之和，所述第一权重与所述第二权重之和为1。
其中，所述数据传输子模块进一步用于建立与所述应用软体的通信通道，建立与所述远端的通信通道。
本发明的有益效果是：区别于现有技术的情况，一方面，本发明通过分别在两个终端中设置的SDN模块来配置两个终端内虚拟网卡信息，SDN模块监听两个终端之间至少两个物理IP通信链路的通信状态，切换以使正常通信的活动链路匹配到通信状态最佳的链路上，从而保证了网络通信质量；而终端内的应用软体通过调用虚拟网卡的虚拟IP地址以实现在网络中的通信，无需知道其使用的具体物理IP通信链路，从而保证了应用软体的网络通信质量。
另一方面，活动链路一直处于发送和接收数据的状态，备用链路一直处于接收数据的状态，当当前活动链路由于通信质量不佳而被切换为 备用链路时，数据接收终端可以一直接收未被及时传输到的数据，从而降低数据传输的丢包率。
附图说明
图1是本发明多通道网络切换方法的一实施方式的流程示意图；
图2是本发明活动链路发送数据的流程示意图及数据包封包示意图；
图3是本发明活动链路和备用链路接收数据的流程示意图及数据包解封示意图；
图4是本发明多通道网络切换系统SDN模块的一实施方式的结构示意图；
图5是图4中监控子模块的结构示意图。
具体实施方式
请参阅图1.图1为本发明多通道网络切换方法的一实施方式的流程示意图，包括：
S101：分别在两个终端中设置软件定义网络(software defined network,SDN)模块，以分别在两个终端内配置虚拟网卡信息，其中，虚拟网卡信息包括虚拟IP地址，两个终端内分别安装有应用软体，且两个终端之间设置有至少两个物理IP通信链路，而两个终端对应于每个物理IP通信链路分别具有一个对应的物理IP地址，两个终端内的应用软体调用两个终端的虚拟IP地址，而SDN模块根据每个终端的虚拟IP地址和每个物理IP通信链路所对应的物理IP地址之间的映射而构建路由信息；至少两个物理IP通信链路中的一个链路作为活动链路，其它链路作为备用链路；
具体地，两个终端之间设置至少两条通信链路的实现方式为，在终端上分别安装至少两个物理网卡，物理网卡分别接入电信、联通或移动等其他网络接入商，并设置其对应的物理IP地址；同时在两个终端上添加物理IP地址路由表来实现通信链路设置。
在两个终端中分别设置SDN模块，SDN模块在其对应的终端内初始 化虚拟网卡，并配置虚拟网卡的信息，包括虚拟IP地址、最大传输单元(MTU)等；SDN模块构建虚拟IP地址和物理IP地址的映射，创建路由信息，该路由信息可对外查询和及时更新；SDN模块建立与远端的通信通道，在一个应用场景中，该通信通道为UDP(user datagram protocol,用户数据报协议)通道，在其他应用场景中，可以为基于其他协议的通道；SDN模块通过文件接口，建立与本终端虚拟网卡的通信通道。
本实施例中应用软体直接调用SDN模块的虚拟IP地址通信，而不需要知道SDN模块具体链接的是哪条物理IP通信链路。
S102：调取当前的活动链路而在两个终端之间进行通信；
具体地，当前的活动链路在两个终端之间发送和接收数据，而当前其余备用链路在两个终端之间接收数据。
请结合图2，图2(a)为本发明活动链路发送数据的流程示意图，图2(b)为待发送数据封装示意图。活动链路发送数据过程为：应用软体的待发送数据进入第一协议栈201，第一协议栈201对待发送数据进行第一协议包封装和内层IP包封装，从而获得第一数据包，并将第一数据包通过当前数据发送终端的虚拟网卡202发送至SDN模块203；在一个应用场景中，第一协议栈201对待发送数据进行TCP协议封装，在其他应用场景中，还可为UDP、ICMP等协议封装；SDN模块203接收第一数据包后，读取内层IP包首部信息，进行路由，发送至第二协议栈204；第二协议栈204对第一数据包进行第二协议包封装和外层IP包封装，从而获得第二数据包，并通过数据发送终端的物理网卡将第二数据包发出，进而完成数据发送，第二数据包通过外层IP包首部在互联网传输，并根据路由信息到达指定接收终端；在一个应用场景中，第二协议包封装为基于UDP协议封装，在其他应用场景中，可以基于其他协议。
请结合图3，图3(a)为本发明活动链路或备用链路接收数据的流程示意图，图3(b)为待接收数据解封示意图。活动链路或备用链路接收数据的方法包括：活动链路或备用链路的数据接收端物理网卡205通过第二数据包的外层IP包首部接收第二数据包，并将第二数据包传输至第二协议栈204；第二协议栈204对第二数据包的外层IP包和第二协议包进 行解封，进而得到第一数据包；SDN模块203读取第一数据包的内层IP包首部，并将第一数据包通过数据接收终端的虚拟网卡202传输至第一协议栈201，第一协议栈201对第一数据包的内层IP包和协议包进行解封，进而完成数据接收。
在上述两个应用场景中，第一协议栈201和第二协议栈204可以为同一个，也可以为不同的两个。
S103：SDN模块监控至少两个物理IP通信链路的通信状态，以判断当前的活动链路的通信质量是否达到预定通信标准；
周期性发送心跳包到远端，远端收到心跳包后发回回复心跳包；根据收到的回复心跳包，实时统计距当前预定时间内的活动链路和备用链路的网络不良率，网络不良率为占第一权重的网络延迟率和占第二权重的丢包率之和，第一权重与第二权重之和为1。
在一个应用场景中，每间隔1ms发送心跳包到远端服务器，远端服务器收到心跳包后发回回复心跳包；SDN模块根据收到的回复心跳包，实时统计距当前过去5min内的活动链路和备用链路的网络不良率。经统计得出，当前活动链路的网络延迟率为80％，丢包率为90％，当前某一条备用链路的网络延迟率为30％，丢包率为20％；另外本应用场景中，第一权重为30％，第二权重为70％，计算得出当前活动链路的网络不良率＝30％*80％+90％*30％＝0.51，当前某一条备用链路的网络不良率＝30％*30％+20％*70％＝0.23；在其他应用场景中，周期性发送心跳包的周期和实时统计的预定时间均可自行设定，计算网络不良率的方法也可根据实际情况进行更改，其余备用链路的网络不良率未具体给出，其计算方式类似。
S104：当确定当前的活动链路的通信质量未达到预定通信标准时，则SDN模块切换至一条通信质量达到预定通信标准的备用链路，并以切换后的备用链路作为当前的活动链路以在两个终端之间进行通信；
具体地，若当前活动链路的网络不良率大于预定通信标准，且当前备用链路的网络不良率小于预定通信标准，则将一条备用链路切换为当前的活动链路以在两个终端之间进行通信。在上述应用场景中，当前活 动链路的网络不良率为0.51，当前某一条备用链路的网络不良率为0.23，而预定通信标准为0.3，此时SDN模块将上述某一条备用链路切换为活动链路，而当前的活动链路则切换为备用链路。在其他应用场景中，预定通信标准可根据实际需求设定。另外，在某些情况下，若此时有不只一条备用链路的网络不良率小于预定通信标准，可在其中任选一条或者选择通信状态最佳的一条备用链路将其切换为活动链路。
在切换后，以切换后的当前的活动链路在两个终端之间发送和接收数据，且切换前的当前的活动链路继续在两个终端之间接收数据，以避免丢包现象的发生。上述发送和接收数据的过程与上述步骤S102中相同，在此不再赘述。
本发明所提供的多通道网络切换系统包括应用软体和SDN模块，请参阅图4，图4为本发明多通道网络切换系统SDN模块一实施方式的结构示意图，SDN模块包括路由管理子模块401、数据传输子模块402、监控子模块403、切换子模块404。
具体地，数据传输子模块402，用于建立至少两个物理IP通信链路，且至少两个物理IP通信链路中的一个链路作为活动链路，其它链路作为备用链路，活动链路为正常通信链路；还用于建立与应用软体的通信通道，建立与远端的通信通道；
路由管理子模块401，用于配置虚拟网卡信息，其中，虚拟网卡信息包括虚拟IP地址；根据每个虚拟IP地址和每个物理IP通信链路所对应的物理IP地址之间的映射而构建路由信息；
监控子模块403，用于根据监控和判断当前活动链路的通信质量是否达到预定的通信标准；
切换子模块404，用于当确定当前活动链路的通信质量未达到预定通信标准的时候，从当前的活动链路切换至一条通信质量达到预定通信标准的备用链路，并以切换后的备用链路作为当前的活动链路；
应用软体根据路由管理子模块401调用虚拟IP地址进行通信。
在一个应用场景中，请参阅图5，图5为图4中监控子模块结构示意图，监控子模块403包括发送单元501和判断单元503，发送单元501 周期性发送心跳包到远端，远端收到心跳包后发回回复心跳包；判断单元503根据收到的回复心跳包，实时统计距当前预定时间内的活动链路和备用链路的网络不良率；若当前活动链路的网络不良率大于预定通信标准，且当前备用链路的网络不良率小于预定通信标准，则发送第一信号至切换子模块404；切换子模块404接收第一信号，进而切换至一条通信质量达到预定通信标准的备用链路，并以切换后的备用链路作为当前的活动链路。请继续参阅图5，监控子模块403还包括计算单元502，计算单元502用于计算网络不良率，并将计算结果实时发送给判断单元503，网络不良率的计算方法为占第一权重的网络延迟率和占第二权重的丢包率之和，第一权重与第二权重之和为1。
综上所述，区别于现有技术的情况，一方面，本发明通过分别在两个终端中设置的SDN模块来配置两个终端内虚拟网卡信息，SDN模块监控两个终端之间至少两个物理IP通信链路的通信状态，切换以使正常通信的活动链路匹配到通信状态最佳的链路上，从而保证了网络通信质量；而终端内的应用软体通过调用虚拟网卡的虚拟IP地址以实现在网络中的通信，无需知道其使用的具体物理IP通信链路，从而保证了应用软体的网络通信质量。
另一方面，活动链路一直处于发送和接收数据的状态，备用链路一直处于接收数据的状态，当当前活动链路由于通信质量不佳而被切换为备用链路时，数据接收终端可以一直接收未被及时传输到的数据，从而降低数据传输的丢包率。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种多通道网络切换方法，其特征在于，包括：
    分别在两个终端中设置软件定义网络(software defined network,SDN)模块，以分别在所述两个终端内配置虚拟网卡信息，其中，所述虚拟网卡信息包括虚拟IP地址，所述两个终端内分别安装有应用软体，且所述两个终端之间设置有至少两个物理IP通信链路，而所述两个终端对应于每个所述物理IP通信链路分别具有一个对应的物理IP地址，所述两个终端内的所述应用软体调用所述两个终端的虚拟IP地址，而所述SDN模块根据每个所述终端的虚拟IP地址和每个所述物理IP通信链路所对应的物理IP地址之间的映射而构建路由信息；所述至少两个物理IP通信链路中的一个链路作为活动链路，其它链路作为备用链路；
    调取当前的所述活动链路而在所述两个终端之间进行通信；
    所述SDN模块监控所述至少两个物理IP通信链路的通信状态，以判断当前的所述活动链路的通信质量是否达到预定通信标准；当确定当前的所述活动链路的通信质量未达到所述预定通信标准时，则所述SDN模块切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路以在所述两个终端之间进行通信。
  2. 根据权利要求1所述的方法，其特征在于，所述SDN模块监控所述至少两个物理IP通信链路的通信状态，以判断当前的所述活动链路的通信质量是否达到预定通信标准；当确定当前的所述活动链路的通信质量未达到所述预定通信标准时，则所述SDN模块切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路以在所述两个终端之间进行通信包括：
    周期性发送心跳包到远端，所述远端收到所述心跳包后返回回复心跳包；
    根据收到的所述回复心跳包，实时统计距当前预定时间内的所述活动链路和所述备用链路的网络不良率；
    若当前所述活动链路的所述网络不良率大于所述预定通信标准，则进一步判断所述备用链路的所述网络不良率是否小于所述预定通信标准，若是则将所述备用链路切换为当前的活动链路以在所述两个终端之间进行通信。
  3. 根据权利要求2所述的方法，其特征在于，
    所述网络不良率为占第一权重的网络延迟率和占第二权重的丢包率之和，所述第一权重与所述第二权重之和为1。
  4. 根据权利要求1所述的方法，其特征在于，当确定当前的所述活动链路的通信质量未达到所述预定通信标准时，则所述SDN模块切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路以在所述两个终端之间进行通信，进一步包括：
    在切换后，以切换后的当前的活动链路在所述两个终端之间发送和接收数据，且切换前的当前的活动链路继续在所述两个终端之间接收数据，以避免丢包现象的发生。
  5. 根据权利要求4所述的方法，其特征在于，所述在切换后，以切换后的当前的活动链路在所述两个终端之间发送数据包括：
    所述应用软体的待发送数据进入第一协议栈，所述第一协议栈对所述待发送数据进行第一协议包封装和内层IP包封装，从而获得第一数据包，并将所述第一数据包通过当前数据发送终端的虚拟网卡发送至所述SDN模块；
    所述SDN模块接收所述第一数据包，读取封装后所述内层IP包首部，进行路由，发送至第二协议栈；
    所述第二协议栈对所述第一数据包进行第二协议包封装和外层IP包封装，从而获得第二数据包，并通过数据发送终端的物理网卡将所述第二数据包发出，进而完成数据发送。
  6. 根据权利要求4所述的方法，其特征在于，所述在切换后，以切换后的当前的活动链路在所述两个终端之间接收数据，且切换前的当前的活动链路继续在所述两个终端之间接收数据包括：
    所述切换后的当前活动链路或所述切换前的当前活动链路的数据接收终端的物理网卡接收所述第二数据包，并将所述第二数据包传输至所述第二协议栈，所述第二协议栈对所述第二数据包的所述外层IP包和所述第二协议包进行解封，进而得到所述第一数据包；
    所述SDN模块读取所述第一数据包的所述内层IP包首部，并将所述第一数据包通过所述数据接收终端的虚拟网卡传输至所述第一协议栈，所述第一协议栈对所述第一数据包的所述内层IP包和所述协议包进行解封，所述应用软体进行数据读取。
  7. 一种多通道网络切换系统，其特征在于，所述切换系统包括应用软体和SDN模块，所述SDN模块包括：
    数据传输子模块，用于建立至少两个物理IP通信链路，且所述至少两个物理IP通信链路中的一个链路作为活动链路，其它链路作为备用链路，所述活动链路为正常通信链路；
    路由管理子模块，用于配置虚拟网卡信息，其中，所述虚拟网卡信息包括虚拟IP地址；根据每个虚拟IP地址和每个所述物理IP通信链路所对应的物理IP地址之间的映射而构建路由信息；
    监控子模块，用于根据监控和判断当前所述活动链路的通信质量是否达到预定的通信标准；
    切换子模块，用于当确定当前所述活动链路的通信质量未达到预定通信标准的时候，从当前的活动链路切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路；
    所述应用软体通过路由管理子模块调用所述虚拟IP地址进行通信。
  8. 根据权利要求7所述的系统，其特征在于，所述监控子模块包括发送单元、判断单元，
    所述发送单元周期性发送心跳包到远端，所述远端收到所述心跳包后发回回复心跳包；
    所述判断单元根据收到的所述回复心跳包，实时统计距当前预定时间内的所述活动链路和所述备用链路的所述网络不良率；若当前所述活 动链路的所述网络不良率大于所述预定通信标准，且当前所述备用链路的所述网络不良率小于所述预定通信标准，则发送第一信号至所述切换子模块；所述切换子模块接收所述第一信号，进而切换至一条通信质量达到所述预定通信标准的所述备用链路，并以切换后的所述备用链路作为当前的活动链路。
  9. 根据权利要求8所述的系统，其特征在于，所述监控子模块进一步包括计算单元，所述计算单元用于计算所述网络不良率，所述网络不良率的计算方法为占第一权重的网络延迟率和占第二权重的丢包率之和，所述第一权重与所述第二权重之和为1。
  10. 根据权利要求9所述的系统，其特征在于，
    所述数据传输子模块进一步用于建立与所述应用软体的通信通道，建立与所述远端的通信通道。
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