CN115801551B

CN115801551B - SD-WAN network tunnel switching method and device

Info

Publication number: CN115801551B
Application number: CN202310102672.2A
Authority: CN
Inventors: 汤小双; 徐莉萍; 赵峰; 刘冲; 马宇宇; 连友
Original assignee: Beijing Xcmg Hanyun Technology Co ltd; XCMG Hanyun Technologies Co Ltd
Current assignee: Beijing Xcmg Hanyun Technology Co ltd; XCMG Hanyun Technologies Co Ltd
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-04-28
Anticipated expiration: 2043-02-13
Also published as: CN115801551A

Abstract

The application discloses a switching method and a switching device of an SD-WAN network tunnel, which are characterized in that a SD-WAN controller is used for receiving bidirectional quality information of a first tunnel and a second tunnel sent by a first customer front-end device, a second customer front-end device and a third customer front-end device in a preset monitoring period, respectively calculating the quality scores of the first tunnel and the second tunnel according to the bidirectional quality information of the first tunnel and the second tunnel, carrying out attenuation correction on the quality scores, calculating the attenuation scores of the first tunnel and the second tunnel, determining the current optimal tunnel in the first tunnel and the second tunnel according to the comparison of the attenuation scores of the first tunnel and the second tunnel in a certain time period, and controlling the first customer front-end device to switch a main link tunnel to the current optimal tunnel. The method and the device can reduce the problem of frequent tunnel switching caused by tunnel network quality fluctuation in the SD-WAN network, and improve the communication quality of the access link of the client front-end equipment.

Description

SD-WAN network tunnel switching method and device

Technical Field

The present application relates to the field of network communications technologies, and in particular, to a method and an apparatus for switching an SD-WAN network tunnel.

Background

SD-WAN (Software Defined Wide Area Network), a software defined wide area network, is a service network formed by applying Software Defined Network (SDN) technology to a wide area network scenario, and is used for connecting enterprise networks, data centers, internet applications and cloud services in a wide geographic range. The SD-WAN network needs to establish a tunnel between two or more customer premises equipment (Customer Premise Equipment, CPE for short), which is a network terminal device located at a user end, and can access the SD-WAN network through an access link formed by multiple tunnels. When the SD-WAN controller monitors that a tunnel on the primary link cannot be established or that a tunnel quality parameter (such as delay time, jitter time, packet loss rate, etc.) is degraded to a set threshold, the SD-WAN controller will automatically switch the client pre-device from the tunnel of the primary link to the tunnel of the backup link.

However, in the prior art, if the tunnel quality parameter of the active link fluctuates up and down, the client front-end device frequently switches between the tunnel of the active link and the tunnel of the standby link, which results in the problem of access link oscillation. In addition, if the tunnel quality of the primary link is poor but the set threshold is not reached, but the tunnel quality of the backup link is good, the client front-end device is still accessing through the tunnel of the primary link at this time, so that the communication quality of the current access link of the client front-end device is not optimal.

Disclosure of Invention

In view of this, the present application proposes a method and apparatus for switching an SD-WAN network tunnel, which can reduce the problem of frequent tunnel switching caused by the fluctuation of tunnel network quality, avoid the oscillation of the access link of the client front-end device, and improve the communication quality of the access link of the client front-end device to the greatest extent.

In a first aspect, the present application proposes a method for switching an SD-WAN network tunnel, applied to an SD-WAN controller, including:

the SD-WAN controller receives bidirectional quality information of a first tunnel between a first customer premises equipment and a second customer premises equipment and bidirectional quality information of a second tunnel between the first customer premises equipment and a third customer premises equipment, wherein the first customer premises equipment, the second customer premises equipment and the third customer premises equipment are transmitted in a preset monitoring period;

the SD-WAN controller respectively calculates a first quality score of the first tunnel and a second quality score of the second tunnel according to the bidirectional quality information of the first tunnel and the bidirectional quality information of the second tunnel, performs weighted summation on the first quality score calculated in the current monitoring period and the first attenuation score of the first tunnel calculated in the last monitoring period based on an attenuation factor, calculates a first attenuation score of the first tunnel in the current monitoring period, performs weighted summation on the second quality score calculated in the current monitoring period and the second attenuation score of the second tunnel calculated in the last monitoring period based on an attenuation factor, and calculates a second attenuation score of the second tunnel in the current monitoring period;

And the SD-WAN controller determines the current optimal tunnel in the first tunnel and the second tunnel according to the comparison of the first attenuation score of the first tunnel and the second attenuation score of the second tunnel in a certain time period, and controls the first client front-end equipment to switch the main link tunnel to the current optimal tunnel.

In an alternative embodiment, the SD-WAN controller calculates a first quality score of the first tunnel and a second quality score of the second tunnel according to the bidirectional quality information of the first tunnel and the bidirectional quality information of the second tunnel, respectively, including:

the SD-WAN controller calculates and obtains the first quality score based on binary continuous function operation of first quality information of the first tunnel in the first direction and second quality information of the first tunnel in the second direction;

and calculating to obtain the second quality score based on binary continuous function operation of third quality information of the first direction and fourth quality information of the second direction of the second tunnel.

In an alternative embodiment, the SD-WAN controller determines a current optimal tunnel of the first tunnel and the second tunnel according to a comparison of a first decay score of the first tunnel and a second decay score of the second tunnel within a certain period of time, including:

The SD-WAN controller determines whether a difference between the first decay score and the second decay score continuously increases or the difference between the first decay score and the second decay score is greater than a predetermined threshold for a predetermined metric period, wherein the metric period is greater than the monitoring period;

if so, determining the tunnel corresponding to the minimum value in the first attenuation score and the second attenuation score as the current optimal tunnel.

In an alternative embodiment, the SD-WAN controller controls the first client front-end device to switch the active link tunnel to the current optimal tunnel, including:

and the SD-WAN controller judges whether the main link tunnel of the first client front-end equipment is the current optimal tunnel, if not, the SD-WAN controller issues a switching instruction of the current optimal tunnel to the first client front-end equipment so as to enable the main link tunnel of the first client front-end equipment to be switched to the current optimal tunnel.

In an alternative embodiment, the first quality information and the second quality information respectively include maximum delay time and jitter time of the first tunnel in the first direction and the second direction in the monitoring period, and the third quality information and the fourth quality information respectively include maximum delay time and jitter time of the second tunnel in the first direction and the second direction in the monitoring period.

In an alternative embodiment, the SD-WAN controller calculates the first quality score based on a binary continuous function operation of first quality information of the first tunnel in a first direction and second quality information of the first tunnel in a second direction; calculating the second quality score based on binary continuous function operation of third quality information of the first direction and fourth quality information of the second direction of the second tunnel, including:

the SD-WAN controller respectively calculates jitter delay ratio and delay normalization value of the first direction and the second direction according to the maximum delay time and jitter time of the first direction and the second direction in the monitoring period aiming at the first tunnel and the second tunnel;

performing binary continuous function operation on the jitter delay ratio of the first direction and the second direction to obtain a first function value, and performing binary continuous function operation on delay normalization values of the first direction and the second direction to obtain a second function value;

and calculating a weighted sum value of the first function value and the second function value based on a first weight factor, so as to obtain the first quality score and the second quality score respectively.

In a second aspect, the present application further proposes a method for switching an SD-WAN network tunnel, applied to an SD-WAN controller, including:

the SD-WAN controller receives bidirectional quality information of at least two tunnels between each client front-end device and other client front-end devices in the plurality of client front-end devices transmitted by the plurality of client front-end devices in a preset monitoring period;

the SD-WAN controller calculates the quality score of each tunnel in the at least two tunnels according to the bidirectional quality information of the at least two tunnels between each client front-end device and other client front-end devices, and performs weighted summation on the quality score of each tunnel in the at least two tunnels calculated in the current monitoring period and the attenuation score of each tunnel in the at least two tunnels calculated in the last monitoring period based on an attenuation factor, so as to calculate the attenuation score of each tunnel in the at least two tunnels in the current monitoring period;

and the SD-WAN controller determines the current optimal tunnel in the at least two tunnels according to the comparison of the attenuation scores of each tunnel in the at least two tunnels in a certain time period, and controls each client front-end equipment to switch the primary link tunnel to the current optimal tunnel.

In an alternative embodiment, the SD-WAN controller calculates a quality score of each of the at least two tunnels according to bidirectional quality information of the at least two tunnels between each client pre-device and other client pre-devices, including:

the SD-WAN controller calculates a quality score of each of the at least two tunnels based on binary continuous function operation of the quality information of the first direction and the quality information of the second direction of each of the at least two tunnels.

In an alternative embodiment, the SD-WAN controller determines a current optimal tunnel of the at least two tunnels according to a comparison of attenuation scores of each of the at least two tunnels over a period of time, including:

the SD-WAN controller judges whether the difference value between the attenuation score of the main link tunnel in the at least two tunnels and the minimum attenuation score in other tunnels continuously increases or the difference value is larger than a preset threshold value in a preset measurement period, wherein the measurement period is larger than the monitoring period;

and if so, determining that the tunnel corresponding to the minimum value in the minimum attenuation scores in the other tunnels as the current optimal tunnel.

In an alternative embodiment, the controlling the each client pre-device to switch the active link tunnel to the current optimal tunnel includes:

and the SD-WAN controller judges whether the main link tunnel of each client front-end equipment is the current optimal tunnel, if not, the SD-WAN controller issues a switching instruction of the current optimal tunnel to each client front-end equipment so that the main link tunnel of each client front-end equipment is switched to the current optimal tunnel.

In a third aspect, the present application proposes a switching device of an SD-WAN network tunnel, applied to an SD-WAN controller, including:

a tunnel monitoring unit, configured to receive bidirectional quality information of a first tunnel between a first client pre-device and a second client pre-device and bidirectional quality information of a second tunnel between the first client pre-device and the third client pre-device, which are sent by the first client pre-device, the second client pre-device and the third client pre-device in a predetermined monitoring period, by using an SD-WAN controller;

a tunnel scoring unit, configured to calculate, by using the SD-WAN controller, a first quality score of the first tunnel and a second quality score of the second tunnel according to the bidirectional quality information of the first tunnel and the bidirectional quality information of the second tunnel, respectively, and perform weighted summation on the first quality score calculated in the current monitoring period and the first attenuation score calculated in the first tunnel in the last monitoring period based on an attenuation factor, calculate a first attenuation score of the first tunnel in the current monitoring period, perform weighted summation on the second quality score calculated in the current monitoring period and the second attenuation score calculated in the second tunnel in the last monitoring period based on an attenuation factor, and calculate a second attenuation score of the second tunnel in the current monitoring period;

And the tunnel switching unit is used for determining the current optimal tunnel in the first tunnel and the second tunnel according to the comparison of the first attenuation score of the first tunnel and the second attenuation score of the second tunnel in a certain time period and controlling the first client front-end equipment to switch the main link tunnel to the current optimal tunnel.

In a fourth aspect, the present application further proposes a switching device of an SD-WAN network tunnel, applied to an SD-WAN controller, including:

a tunnel monitoring unit, configured to receive, by using an SD-WAN controller, bidirectional quality information of at least two tunnels between each of a plurality of client pre-devices and other client pre-devices, where the plurality of client pre-devices send the bidirectional quality information in a predetermined monitoring period;

the tunnel scoring unit is used for respectively calculating the quality score of each tunnel in the at least two tunnels according to the bidirectional quality information of the at least two tunnels between each client front-end device and other client front-end devices, and carrying out weighted summation on the quality score of each tunnel in the at least two tunnels calculated in the current monitoring period and the attenuation score of each tunnel in the at least two tunnels calculated in the last monitoring period based on an attenuation factor, so as to calculate the attenuation score of each tunnel in the at least two tunnels in the current monitoring period;

And the tunnel switching unit is used for determining the current optimal tunnel in the at least two tunnels according to the comparison of the attenuation scores of each tunnel in the at least two tunnels in a certain time period by the SD-WAN controller, and controlling each client front-end equipment to switch the main link tunnel to the current optimal tunnel.

The embodiment of the application can at least achieve the following beneficial effects:

according to the embodiment of the application, the SD-WAN controller is used for receiving the bidirectional quality information of the first tunnel and the bidirectional quality information of the second tunnel, which are periodically transmitted by the first client front-end equipment, the second client front-end equipment and the third client front-end equipment; respectively calculating a first quality score of the first tunnel and a second quality score of the second tunnel according to the bidirectional quality information of the first tunnel and the bidirectional quality information of the second tunnel, performing attenuation correction on the first quality score and the second quality score, and calculating a first attenuation score of the first tunnel and a second attenuation score of the second tunnel; and determining the current optimal tunnel in the first tunnel and the second tunnel according to the comparison of the first attenuation score of the first tunnel and the second attenuation score of the second tunnel in a certain time period, and controlling the first client front-end equipment to switch the main link tunnel to the current optimal tunnel. Therefore, on one hand, the method and the device can reduce the problem of frequent tunnel switching caused by tunnel network quality fluctuation in the SD-WAN network, and avoid access link oscillation of the client front-end equipment; on the other hand, when the tunnel network quality of the main link of the SD-WAN network is continuously deteriorated but does not reach the switching threshold, the main link tunnel can be timely switched to the current optimal tunnel according to the comparison of the attenuation scores of the tunnel quality of the main link and the standby link, so that the communication quality of the access link of the client front-end equipment is improved to the greatest extent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings that are required to be used in the embodiments of the present application. It is appreciated that the following drawings depict only certain embodiments of the application and are not to be considered limiting of its scope.

FIG. 1 is a schematic diagram of an exemplary SD-WAN network system according to an embodiment of the present application;

fig. 2 is a flow chart of a method for switching SD-WAN network tunnels according to a first embodiment of the present application;

FIG. 3 is a partial flow diagram of a method for switching SD-WAN network tunnels according to another embodiment of the present application;

FIG. 4 is a graph illustrating an exemplary binary continuous function employed by an embodiment of the present application;

fig. 5 is a partial flow diagram of a method for switching SD-WAN network tunnels according to another embodiment of the present application;

FIG. 6 is a partial flow diagram of a method of switching SD-WAN network tunnels according to another embodiment of the present application;

fig. 7 is a flowchart of a method for switching SD-WAN network tunnels according to a second embodiment of the present application;

FIG. 8 is a partial flow diagram of a method of switching SD-WAN network tunnels according to another embodiment of the present application;

Fig. 9 is a schematic structural diagram of a switching device of an SD-WAN network tunnel according to the first embodiment of the present application;

fig. 10 is a schematic structural diagram of a switching device of an SD-WAN network tunnel according to a second embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. However, it should be understood that the described embodiments are only some, but not all, of the exemplary embodiments of the present application and, therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claims of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and in the claims of this application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order, and are not to be construed as indicating or implying relative importance.

As described above, in the prior art, if the tunnel quality parameter of the primary link fluctuates, the tunnel quality parameter of the SD-WAN network tunnel may cause the Customer Premise Equipment (CPE) to frequently switch back and forth between the tunnel of the primary link and the tunnel of the backup link, which results in the problem of access link oscillation. In addition, if the tunnel quality of the primary link is poor but the set threshold is not reached, but the tunnel quality of the backup link is good, the client front-end device is still accessing through the tunnel of the primary link at this time, so that the communication quality of the current access link of the client front-end device is not optimal. Therefore, the method and the device for switching the SD-WAN network tunnel can reduce the problem of frequent tunnel switching caused by tunnel network quality fluctuation, avoid access link oscillation of the client front-end equipment, and improve the communication quality of the access link of the client front-end equipment to the greatest extent.

Fig. 1 is a schematic diagram of an exemplary SD-WAN network system according to an embodiment of the present application. As shown in fig. 1, the system illustratively includes a first client pre-amble 101, a second client pre-amble 102, and a third client pre-amble 103, where the first client pre-amble 101, the second client pre-amble 102, and the third client pre-amble 103 respectively establish a communication connection with an SD-WAN controller 106. The SD-WAN controller 106 is a management control core of the SD-WAN network system, and is responsible for network policy making and issuing, link quality monitoring, and link switching. Wherein the first client pre-amble 101 can access the SD-WAN network through a first tunnel 104 with the second client pre-amble 102 and a second tunnel 105 with the third client pre-amble 103, respectively. In one embodiment, the first tunnel 104 may be a primary link tunnel and the second tunnel 105 may be a backup link tunnel. In another embodiment, the first tunnel 104 may be a backup link tunnel and the second tunnel 105 may be a primary link tunnel. The first client pre-device 101, the second client pre-device 102, and the third client pre-device 103 each send bi-directional quality information, such as at least one or a combination of maximum delay time, jitter time, and packet loss rate, about the first tunnel 104 and the second tunnel 105 to the SD-WAN controller 106 at predetermined monitoring periods through communication connection with the SD-WAN controller 106, respectively. Such bi-directional quality information may be derived based on monitoring network quality parameters in the first direction and the second direction by each customer premises equipment.

It should be noted that, in order to clearly illustrate the principle of the technical solution of the present application, fig. 1 only shows three client pre-devices of the first client pre-device 101, the second client pre-device 102, and the third client pre-device 103, and a case where the first tunnel 104 and the second tunnel 105 are established between the first client pre-device 101 and the second client pre-device 102, and the third client pre-device 103, in fact, the technical solution of the present application is not limited to the number of client pre-devices, and the tunnel of the access link of each client pre-device may also be a case of more than two tunnels.

Fig. 2 is a flow chart of a method for switching SD-WAN network tunnels according to the first embodiment of the present application. As shown in fig. 2, the method for switching the SD-WAN network tunnel in the embodiment of the present application, which is suitable for being executed in the SD-WAN controller 106, may include the following steps:

step S201, the SD-WAN controller 106 receives the bidirectional quality information of the first tunnel 104 between the first client pre-device 101 and the second client pre-device 102 and the bidirectional quality information of the second tunnel 105 between the first client pre-device 101 and the third client pre-device 103, which are transmitted by the first client pre-device 101, the second client pre-device 102 and the third client pre-device 103 at a predetermined monitoring period;

Step S202, the SD-WAN controller 106 calculates a first quality score of the first tunnel 104 and a second quality score of the second tunnel 105 according to the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, and performs attenuation correction on the first quality score and the second quality score, so as to calculate a first attenuation score of the first tunnel 104 and a second attenuation score of the second tunnel 105;

in step S203, the SD-WAN controller 106 determines a current optimal tunnel of the first tunnel 104 and the second tunnel 105 according to the comparison between the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105 in a certain period of time, and controls the first client front-end 101 to switch the active link tunnel to the current optimal tunnel.

In one embodiment, in the step S201, the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, which are sent by the first client pre-device 101, the second client pre-device 102, and the third client pre-device 103 in a predetermined monitoring period, include first quality information of the first tunnel 104 in a first direction and second quality information of the second tunnel 105 in a second direction, and third quality information of the second tunnel 105 in the first direction and fourth quality information of the second direction, respectively.

Specifically, for the first client front end 101, the first client front end 101 is connected to the second client front end 102 through the first tunnel 104, and if the data transmission direction from the first client front end 101 to the second client front end 102 is taken as a first direction and the data transmission direction from the second client front end 102 to the first client front end 101 is taken as a second direction, the first client front end 101 may report the first quality information of the first direction of the first tunnel 104 to the SD-WAN controller 106. Meanwhile, the first client pre-device 101 is further connected to the third client pre-device 103 through the second tunnel 105, and if the data transmission direction from the first client pre-device 101 to the third client pre-device 103 is taken as a first direction and the data transmission direction from the third client pre-device 103 to the first client pre-device 101 is taken as a second direction, the first client pre-device 101 may also report third quality information of the first direction of the second tunnel 105 to the SD-WAN controller 106 at the same time. Similarly, for the second client pre-amble 102, where the second client pre-amble 102 is connected to the first client pre-amble 101 through the first tunnel 104, the second client pre-amble 102 may report the second quality information of the second direction of the first tunnel 104 to the SD-WAN controller 106. For the third client pre-amble 103, the third client pre-amble 103 is connected to the first client pre-amble 101 with the second tunnel 105, then the third client pre-amble 103 may report fourth quality information of the second direction of the second tunnel 105 to the SD-WAN controller 106.

In one embodiment, as shown in fig. 3, the SD-WAN controller 106 in the above step S202 calculates the first quality score of the first tunnel 104 and the second quality score of the second tunnel 105 according to the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, respectively, and may include the following steps:

step S301, the SD-WAN controller 106 calculates a first quality score of the first tunnel 104 based on a binary continuous function operation of the first quality information of the first tunnel 104 in the first direction and the second quality information of the second direction;

step S302, calculating a second quality score of the second tunnel 105 based on a binary continuous function operation of the third quality information of the first direction and the fourth quality information of the second direction of the second tunnel 105.

In this embodiment, the execution of step S301 and step S302 is not sequential, and may be performed in parallel at the same time or in any order.

In this embodiment, the SD-WAN controller 106, after receiving the bidirectional quality information of the first tunnel 104 and the second tunnel 105 sent by the first client pre-device 101, the second client pre-device 102 and the third client pre-device 103 in a predetermined monitoring period, needs to calculate the first quality score of the first tunnel 104 and the second quality score of the second tunnel 105 based on the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105. The calculation of the first quality score of the first tunnel 104 and the second quality score of the second tunnel 105 is performed by performing binary continuous function operation on the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, respectively.

In this embodiment, the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105 are respectively performed

Binary continuous function operation of (2), whereinxQuality information representing a first direction of the first tunnel or the second tunnel,yquality information representing a second direction of the first tunnel or the second tunnel,Qrepresenting a quality score for the first tunnel or the second tunnel. Based on the continuity of the binary continuous function, whenxAndyat [0,1 ]]When the interval is changed in an ascending or descending way,Qand also correspondingly in [0,1 ]]The range of the interval is changed incrementally or decrementally, i.e. when the quality information of the first direction and the second direction of the first tunnel or the second tunnel is located at [0,1]The quality score may be at [0,1 ] when increasing over the interval]The range of the interval increases with the increment of the quality information of the first direction and the second direction, when the quality information of the first direction and the second direction of the first tunnel or the second tunnel is positioned in [0,1]The quality score may be at [0,1 ] when decreasing over the interval]The range of the interval decreases as the quality information of the first direction and the second direction decreases.

FIG. 4 is a graph illustrating an exemplary binary continuous function employed by an embodiment of the present application. As shown in FIG. 4, the exemplary binary continuous function

Presenting a continuous surface in a coordinate system space, wherein, whenxAndyat [0,1]]Interval ofAs the range increases from 0 to 1,Qand also correspondingly in [0,1]]The interval range shows continuous increment, and gradually approaches to 1 from 0; when (when)xAndyat [0,1]]As the interval ranges from 1 to 0 decreases,Qand also correspondingly in [0,1]]The interval range shows a decreasing continuity, gradually approaching 0 from 1.

Based on the characteristics of the binary continuous function, the present embodiment may normalize the quality information of the first direction and the second direction of the first tunnel or the second tunnel to the [0,1] interval, and then calculate the first quality score of the first tunnel 104 in the [0,1] interval and the second quality score of the second tunnel 105 in the [0,1] interval through the operation of the binary continuous function.

In one embodiment, the first quality information of the first tunnel 104 in the first direction and the second quality information of the second direction may include maximum delay times of the first tunnel 104 in the first direction and the second direction, respectively, within the predetermined monitoring period. Accordingly, the third quality information of the second tunnel 105 in the first direction and the fourth quality information of the second direction may include maximum delay times of the second tunnel 105 in the first direction and the second direction, respectively, within the predetermined monitoring period. The maximum delay time characterizes the maximum delay time of the data packet sent by the target tunnel in a preset monitoring period, and the larger the maximum delay time is, the worse the network quality of the tunnel is.

Assuming that the maximum delay time of the first tunnel 104 in the first direction is expressed as

The maximum delay time of the first tunnel 104 in the second direction is denoted +.>

The maximum delay time of the second tunnel 105 in the first direction is denoted +.>

The maximum delay time of the second tunnel 105 in the second direction is denoted +.>

The first quality score of the first tunnel 104 is denoted +.>

The second quality score of the second tunnel 105 is denoted +.>

。

Then, the maximum delay time of the first tunnel 104 in the first direction and the second direction is first set

And

and the maximum delay time +_ of said second tunnel 105 in the first direction and in the second direction>

And->

Are all normalized to [0,1 ]]Intervals, respectively obtaining [0,1 ] corresponding to the maximum delay time of the first tunnel 104 in the first direction and the second direction]Delay normalization value +.>

And->

And [0,1 ] corresponding to the maximum delay time of the second tunnel 105 in the first direction and the second direction]Delay normalization value +.>

And->

。

In one embodiment, to avoid the effect of a range fluctuation in the maximum delay time on the quality scores of the first tunnel 104 and the second tunnel 105,the maximum delay time of the first tunnel 104 in the first direction and the second direction can be mapped in an interval mode

And->

And->

Mapping to [0,1 ] by interval range]Corresponding values of the interval. Table 1 below shows that the maximum delay time is at [0,1 ]]An example of interval mapping is merely exemplary, and the interval mapping of the maximum delay time may be other manners according to the embodiments of the present application, and the obtaining manner of the normalized value of the maximum delay time may also be other manners according to the embodiments of the present application.

TABLE 1

Then, for the first tunnel 104, the maximum delay time in the first direction and the second direction corresponds to [0,1 ]]Delay normalization value of interval

And->

And->

The binary continuous function operation is performed, so as to calculate a first quality score of the first tunnel 104 and a second quality score of the second tunnel 105, where the calculation formula is as follows:

，/>

。

a first quality score for the first tunnel 104 calculated according to the above formula

And a second quality score +/for said second tunnel 105 >

Is located at [0,1 ]]Scoring values of the intervals, namely delay normalization values corresponding to maximum delay times of the first tunnel 104 in the first direction and the second direction +.>

And->

And a delay normalization value corresponding to the maximum delay time of the second tunnel 105 in the first direction and the second direction +.>

And->

The larger the first quality score of the first tunnel 104 is, the higher the first quality score is>

And a second quality score +/for said second tunnel 105>

The larger the corresponding.

In another embodiment, the first quality information of the first tunnel 104 in the first direction and the second quality information of the second direction may include a maximum delay time and a jitter time of the first tunnel 104 in the first direction and the second direction, respectively, in the predetermined monitoring period. Accordingly, the third quality information of the second tunnel 105 in the first direction and the fourth quality information of the second direction may include a maximum delay time and a jitter time of the second tunnel 105 in the first direction and the second direction, respectively, within the predetermined monitoring period.

In this embodiment, the quality parameters of the jitter time are further introduced into the tunnel quality information of the first tunnel 104 and the second tunnel 105. The jitter time is the difference value between the maximum delay time and the minimum delay time of the tunnel in a preset monitoring period, the network stability of the tunnel is represented, the larger the jitter time is, the worse the network stability is, and the smaller the jitter time is, the better the network stability is.

Assume that the jitter time of the first tunnel 104 in the first direction is expressed as

The jitter time of the first tunnel 104 in the second direction is denoted +.>

The jitter time of the second tunnel 105 in the first direction is denoted +.>

The jitter time of the second tunnel 105 in the second direction is denoted +.>

。

Then, first, the first tunnel 104 is dithered in the first direction and the second direction for a period of time

And->

And the jitter time of said second tunnel 105 in the first direction and in the second direction +.>

And->

Are all normalized to [0,1 ]]Section, respectively obtaining [0,1 ] corresponding to jitter time of the first tunnel 104 in the first direction and the second direction]Jitter normalized value +.>

And->

And [0,1 ] corresponding to the jitter time of the second tunnel 105 in the first direction and the second direction]Jitter normalized value +.>

And->

。

In one embodiment, a jitter delay ratio, which is a ratio of a jitter time in the first direction and a jitter time in the second direction to a maximum delay time in the first direction and the second direction, respectively, may be used as the jitter normalization value. Since the jitter time is the difference between the maximum delay time and the minimum delay time of the tunnel in the predetermined monitoring period, the jitter time is smaller than the maximum delay time, and the ratio of the jitter time to the maximum delay time, i.e., the jitter delay ratio, is at [0,1 ]Values of the intervals. Thus, jitter normalized values corresponding to the jitter times of the first tunnel 104 in the first direction and the second direction can be calculated according to the following formula

And->

And jitter normalized value +_for jitter time of said second tunnel 105 in the first direction and the second direction>

And->

。

，

，/>

，

。

Then, for the first tunnel 104 and the second tunnel 105, performing binary continuous function operation on the jitter normalized values in the first direction and the second direction respectively to obtain a first function value; and carrying out the binary continuous function operation on the delay normalized values in the first direction and the second direction to obtain a second function value.

Finally, a weighted sum of the first and second function values is calculated based on a first weight factor, so as to calculate a first quality score of the first tunnel 104 in the [0,1] interval and a second quality score of the second tunnel 105 in the [0,1] interval, respectively.

The calculation formula is as follows:

，

。

in the above-mentioned formula(s),

to characterize the first weight factor of the weight of the jitter normalized value in the quality score,

1, by adjusting the magnitude of the first weight factor, the proportion of each of the jitter normalized value and the delay normalized value in the first quality score and the second quality score can be adjusted accordingly.

In this embodiment, the channel quality of the first channel 104 and the channel quality of the second channel 105 may be evaluated more accurately than the foregoing embodiments by performing a binary continuous function operation based on the normalized values of the jitter time and the maximum delay time of the first channel 104 and the second channel 105 in the first direction and the second direction, and performing a weighted summation on the first function value and the second function value obtained by the calculation, thereby obtaining the first quality score of the first channel 104 and the second quality score of the second channel 105.

In another embodiment, the first quality information of the first tunnel 104 in the first direction and the second quality information of the second direction may include a maximum delay time, a jitter time, and a packet loss rate of the first tunnel 104 in the first direction and the second direction, respectively, in the predetermined monitoring period. Accordingly, the third quality information of the second tunnel 105 in the first direction and the fourth quality information of the second direction may include the maximum delay time, the jitter time, and the packet loss rate of the second tunnel 105 in the first direction and the second direction in the predetermined monitoring period, respectively.

In this embodiment, the quality parameters of the packet loss rate are further introduced into the tunnel quality information of the first tunnel 104 and the second tunnel 105. The packet loss rate is the ratio of the number of lost data packets of the tunnel to the total number of transmitted data packets in a preset monitoring period, and characterizes the network reliability of the tunnel, and the greater the packet loss rate, the worse the network reliability, and the worse the communication quality.

Assume that the packet loss rate of the first tunnel 104 in the first direction is expressed as

The packet loss rate of the first tunnel 104 in the second direction is expressed as +.>

The packet loss rate of the second tunnel 105 in the first direction is denoted +.>

The packet loss rate of the second tunnel 105 in the second direction is denoted as +.>

. Since the packet loss rate itself is [0,1]]The value of the interval does not need to be calculated as a normalization value, and the above binary continuous function operation can be further performed based on the packet loss rates of the first tunnel 104 and the second tunnel 105 in the first direction and the second direction to obtain the third function value on the basis of the above embodiment.

Then, a weighted sum of the first, second and third function values is calculated based on the first and second weight factors, thereby calculating a first quality score for the first tunnel 104 in the [0,1] section and a second quality score for the second tunnel 105 in the [0,1] section, respectively.

The calculation formula is as follows:

；

。

in the above-mentioned formula(s),

1；

a second weight factor for characterizing the weight of the delay normalized value in the quality score +. >

1. By adjusting the values of the first weight factor and the second weight factor, the proportion of each of the jitter normalization value, the delay normalization value and the packet loss rate in the first quality score and the second quality score can be adjusted accordingly.

In this embodiment, based on the normalized values of the jitter time and the maximum delay time of the first tunnel 104 and the second tunnel 105 in the first direction and the second direction and the binary continuous function operation of the packet loss rate, the first function value, the second function value and the third function value obtained by the calculation are weighted and summed, so as to obtain the first quality score of the first tunnel 104 and the second quality score of the second tunnel 105, which can further comprehensively and accurately evaluate the tunnel quality of the first tunnel and the second tunnel compared with the foregoing embodiment.

In another embodiment, the calculation formula of the quality score in the foregoing embodiment may be further modified in consideration of a certain correlation between the jitter time and the maximum delay time of the tunnel. And weighting by using a first weighting factor in the middle process of performing binary continuous function operation based on jitter normalized values and delay normalized values of the first tunnel 104 and the second tunnel 105 in the first direction and the second direction, and then calculating to obtain a comprehensive fourth function value.

When the first quality information of the first tunnel 104 in the first direction and the second quality information of the second tunnel 105 in the first direction and the fourth quality information of the second tunnel 105 in the second direction respectively include the maximum delay time and the maximum jitter time of the first direction and the second direction in the predetermined monitoring period, the calculation formulas of the first quality score of the first tunnel 104 and the second quality score of the second tunnel 105 after modification are as follows:

，

。

when the first quality information of the first tunnel 104 in the first direction and the second quality information of the second tunnel 105 in the first direction and the fourth quality information of the second tunnel 105 in the second direction respectively include the maximum delay time, the jitter time and the packet loss rate of the first direction and the second direction in the predetermined monitoring period, the calculation formulas of the first quality score of the first tunnel 104 and the second quality score of the second tunnel 105 after modification are as follows:

，

。

in the above formula, the first weight factor

Characterizing weights of jitter normalized value and delay normalized value in binary continuous function operation of fourth function value, +.>

1, a step of; second weight factor- >

Weight of fourth function value characterizing jitter normalized value and delay normalized value in quality score,/->

1. The quality scores of the first tunnel 104 and the second tunnel 105 calculated by the above modified formulas obtain good technical effects in both testing and practice.

In one embodiment, as shown in fig. 5, the performing the attenuation correction on the first quality score and the second quality score in the step S202 to calculate a first attenuation score of the first tunnel 104 and a second attenuation score of the second tunnel 105 may include the following steps:

step S401, performing weighted summation on the first quality score calculated in the current monitoring period and the first attenuation score of the first tunnel 104 calculated in the previous monitoring period based on an attenuation factor, and calculating to obtain a first attenuation score of the first tunnel 104 in the current monitoring period;

step S402, performing weighted summation on the second quality score calculated in the current monitoring period and the second attenuation score of the second tunnel 105 calculated in the previous monitoring period based on the attenuation factor, and calculating to obtain a second attenuation score of the second tunnel 105 in the current monitoring period.

In this embodiment, the execution of step S401 and step S402 is not sequential, and may be performed in parallel at the same time or in any order.

In this embodiment, after the first quality score of the first tunnel 104 and the second quality score of the second tunnel 105 have been obtained, attenuation correction needs to be performed on the first quality score and the second quality score, where the purpose of attenuation correction is to avoid access link oscillation that may be caused by performing tunnel switching directly by using the comparison between the calculated first quality score and the calculated second quality score. For this reason, the present embodiment further introduces an attenuation factor, and weights and sums the first quality score and the second quality score calculated in the current monitoring period with the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105 calculated in the previous monitoring period respectively based on the attenuation factor, so as to calculate the first attenuation score of the first tunnel 104 and the first attenuation score of the second tunnel 105 in the current monitoring period. Assuming that a first decay score of the first tunnel 104 for a current monitoring period is represented as

The second decay score of said second tunnel 105 of the current monitoring period is denoted +. >

The first decay score of said first tunnel 104 of the last monitoring period is denoted +.>

The second decay score of said second tunnel 105 of the last monitoring period is denoted +.>

The first tunnel 104 of the current monitoring periodAttenuation score->

And a second decay score +.f. of said second tunnel 105 for the current monitoring period>

The method can be obtained by the following calculation formula: />

，

。

Wherein for calculation of the decay score of the initial monitoring period, the first decay score of the last monitoring period

And a second decay score->

Is 0. +.>

Represents an attenuation factor->

1 by modulating the attenuation factor->

The magnitude of the increase or decrease of the first attenuation score of the first tunnel and the second attenuation score of the second tunnel in each monitoring period can be controlled, so that the magnitude of the increase or decrease of the attenuation score of the current monitoring period along with the increase or decrease of the quality score can be leveled by the attenuation score of the last monitoring period, and the abrupt increase or decrease of the attenuation score of the tunnel caused by the abrupt fluctuation change of the state of the tunnel network is avoided, thereby avoiding the link switching oscillation caused by the abrupt increase or decrease of the quality score of the tunnel. In addition, in the case of the optical fiber, Based on the above-mentioned action of the attenuation factors, by adjusting the magnitude of the attenuation factors, the hysteresis degree of the SD-WAN controller executing the tunnel switching action can also be adjusted, when the attenuation factors are larger, the magnitude of increase or decrease of the first attenuation score of the first tunnel and the second attenuation score of the second tunnel in the current monitoring period is relatively smaller, and the tunnel switching action is relatively delayed; when the attenuation factor is smaller, the magnitude of the increase or decrease of the first attenuation score of the first tunnel and the second attenuation score of the second tunnel in the current monitoring period is relatively larger, and the tunnel switching action is relatively rapid.

Therefore, in this embodiment, by performing attenuation correction on the first quality score and the second quality score, and calculating the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105, the current optimal tunnel in the first tunnel 104 and the second tunnel 105 can be determined according to the comparison between the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105 in a certain period of time, so as to be used as the basis of subsequent tunnel switching.

In one embodiment, as shown in fig. 6, the determining, by the SD-WAN controller 106 in the above step S203, the current optimal tunnel of the first tunnel 104 and the second tunnel 105 according to the comparison between the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105 in a certain period of time may include the following steps:

Step S501, the SD-WAN controller 106 determines whether the difference between the first attenuation score and the second attenuation score continuously increases or the difference between the first attenuation score and the second attenuation score is greater than a predetermined threshold value within a predetermined measurement period, wherein the measurement period is greater than the monitoring period;

and step S502, if so, determining the tunnel corresponding to the minimum value in the first attenuation score and the second attenuation score as the current optimal tunnel.

In this embodiment, for example, assuming that the tunnel quality of the first tunnel 104 suddenly deteriorates, such as the maximum delay time, jitter time or packet loss rate in the current monitoring period increases, the first quality score of the first tunnel also increases correspondingly, according to the calculation formula of the first attenuation score, the first attenuation score of the previous monitoring period and the first quality score obtained by current calculation are weighted and summed by the attenuation factor, so that the increasing amplitude of the first attenuation score of the current monitoring period can be reduced, so that the first attenuation score does not increase sharply and link switching of the tunnel is not caused. Unless the tunnel quality of the first tunnel 104 continues to deteriorate over a predetermined metric period, such as a continuous increase in maximum delay time, jitter time, or packet loss rate over a plurality of consecutive monitoring periods, the first decay score calculated by the above equation may exhibit a continuous increase in the difference between the first decay score and the second decay score or a gradual increase in the difference between the first decay score and the second decay score from a smaller magnitude to greater than a predetermined threshold value over the predetermined metric period. Then, at this time, the SD-WAN controller 106 may determine that the minimum value of the first tunnel 104 and the second tunnel 105 is the current optimal tunnel, and start to start a tunnel switching action, so as to control the first client front-end device 101 to switch the primary link tunnel to the current optimal tunnel.

In one embodiment, the controlling, by the SD-WAN controller 106 in the above step S203, the first client pre-device 101 to switch the active link tunnel to the current optimal tunnel may include:

the SD-WAN controller 106 determines whether the primary link tunnel of the first client pre-device 101 is the current optimal tunnel, if not, issues a switching instruction of the current optimal tunnel to the first client pre-device 101, so that the primary link tunnel of the first client pre-device 101 is switched to the current optimal tunnel.

In summary, the switching method of the SD-WAN network tunnel in the embodiment of the present application receives, through the SD-WAN controller 106, the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, which are sent by the first client pre-device 101, the second client pre-device 102, and the third client pre-device 103 in a predetermined monitoring period; respectively calculating a first quality score of the first tunnel 104 and a second quality score of the second tunnel 105 according to the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, performing attenuation correction on the first quality score and the second quality score, and calculating a first attenuation score of the first tunnel 104 and a second attenuation score of the second tunnel 105; and determining the current optimal tunnel in the first tunnel 104 and the second tunnel 105 according to the comparison of the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105 in a certain time period, and controlling the first client front-end equipment 101 to switch the primary link tunnel to the current optimal tunnel. Therefore, on one hand, the method and the device can reduce the problem of frequent tunnel switching caused by tunnel network quality fluctuation in the SD-WAN network, and avoid access link oscillation of the client front-end equipment; on the other hand, when the tunnel network quality of the main link of the SD-WAN network is continuously deteriorated but does not reach the switching threshold, the main link tunnel can be timely switched to the current optimal tunnel according to the comparison of the attenuation scores of the tunnel quality of the main link and the standby link, so that the communication quality of the access link of the client front-end equipment is improved to the greatest extent.

Fig. 7 is a flowchart of a handoff method of an SD-WAN network tunnel according to a second embodiment of the present application. As shown in fig. 7, the method for switching the SD-WAN network tunnel in the embodiment of the present application, which is suitable for being executed in the SD-WAN controller 106, may include the following steps:

step S601, the SD-WAN controller 106 receives bidirectional quality information of at least two tunnels between each of the plurality of client pre-devices and other client pre-devices, which are transmitted by the plurality of client pre-devices at a predetermined monitoring period;

step S602, the SD-WAN controller 106 calculates a quality score of each of the at least two tunnels according to the bidirectional quality information of the at least two tunnels between each client pre-device and other client pre-devices, and performs attenuation correction on the quality score, so as to calculate an attenuation score of each of the at least two tunnels;

in step S603, the SD-WAN controller 106 determines a current optimal tunnel of the at least two tunnels according to the comparison of the attenuation scores of each tunnel of the at least two tunnels within a certain period of time, and controls each client front-end device to switch the active link tunnel to the current optimal tunnel.

In one embodiment, in step S601, the bidirectional quality information of at least two tunnels between each client pre-device and other client pre-devices includes quality information of a first direction and quality information of a second direction of each of the at least two tunnels. For at least two tunnels between each client head-end and the other client head-end, if a data transmission direction from the each client head-end to the other client head-end is taken as a first direction and a data transmission direction from the other client head-end to the each client head-end is taken as a second direction, the client head-end at opposite ends of each of the at least two tunnels between the each client head-end and the other client head-end respectively transmits quality information of the first direction and quality information of the second direction of each tunnel to the SD-WAN controller 106 at predetermined monitoring periods.

In one embodiment, in the step S602, the SD-WAN controller 106 calculates the quality score of each of the at least two tunnels according to the bidirectional quality information of the at least two tunnels between each client pre-device and other client pre-devices, and may include the following steps:

The SD-WAN controller 106 calculates a quality score for each of the at least two tunnels based on a binary continuous function operation of the quality information of the first direction and the quality information of the second direction for each of the at least two tunnels.

In one embodiment, the performing the attenuation correction on the quality score in the step S602, calculating the attenuation score of each of the at least two tunnels may include the following steps:

and carrying out weighted summation on the quality score of each tunnel in the at least two tunnels calculated in the current monitoring period and the attenuation score of each tunnel in the at least two tunnels calculated in the last monitoring period based on the attenuation factors, and calculating to obtain the attenuation score of each tunnel in the at least two tunnels in the current monitoring period.

In one embodiment, as shown in fig. 8, the determining, by the SD-WAN controller 106 in the above step S603, the current optimal tunnel of the at least two tunnels according to the comparison of the attenuation scores of each of the at least two tunnels in a certain period of time may include the following steps:

step S701, the SD-WAN controller 106 determines whether the difference between the attenuation score of the active link tunnel in the at least two tunnels and the minimum attenuation score in the other tunnels continuously increases or the difference is greater than a predetermined threshold value within a predetermined metric period, wherein the metric period is greater than the monitoring period;

And step S702, if so, determining that the tunnel corresponding to the minimum value in the minimum attenuation scores in the other tunnels as the current optimal tunnel.

In one embodiment, the controlling the each client pre-device to switch the active link tunnel to the current optimal tunnel in step S603 includes:

the SD-WAN controller 106 determines whether the active link tunnel of each client pre-device is the current optimal tunnel, if not, issues a switching instruction of the current optimal tunnel to each client pre-device, so that the active link tunnel of each client pre-device is switched to the current optimal tunnel.

It should be noted that, the description of the relevant features of the bidirectional quality information of the tunnel between the client pre-devices and the calculation formulas of the quality scores and the attenuation scores of the tunnel described in any of the foregoing embodiments of the present application are also applicable to the present embodiment, and are not further described herein.

The method for switching the SD-WAN network tunnel in the embodiment of the present application receives, through the SD-WAN controller 106, bidirectional quality information of at least two tunnels between each client pre-device and other client pre-devices in the plurality of client pre-devices sent by the plurality of client pre-devices in a predetermined monitoring period; the SD-WAN controller 106 calculates a quality score of each of the at least two tunnels according to the bidirectional quality information of the at least two tunnels between each client pre-device and other client pre-devices, and performs attenuation correction on the quality score, so as to calculate an attenuation score of each of the at least two tunnels; the SD-WAN controller 106 determines a current optimal tunnel of the at least two tunnels according to the comparison of the attenuation scores of each tunnel in the at least two tunnels in a certain period of time, and controls each client front-end device to switch the primary link tunnel to the current optimal tunnel. Therefore, on one hand, the method and the device can reduce the problem of frequent tunnel switching caused by tunnel network quality fluctuation in the SD-WAN network, and avoid access link oscillation of any client front-end equipment; on the other hand, when the tunnel quality of the primary link of any client front-end equipment in the SD-WAN network is continuously deteriorated but does not reach the switching threshold value, the primary link tunnel can be timely switched to the current optimal tunnel according to the comparison of the attenuation scores of the tunnel quality of the primary link and the standby link, so that the communication quality of the access link of any client front-end equipment is improved to the greatest extent.

Fig. 9 is a schematic structural diagram of a switching device of an SD-WAN network tunnel according to the first embodiment of the present application. As shown in fig. 9, the switching device of the SD-WAN network tunnel in the embodiment of the present application may include the following units:

a tunnel monitoring unit 801 for receiving, by the SD-WAN controller 106, bidirectional quality information of a first tunnel 104 between the first client pre-device 101 and the second client pre-device 102 and bidirectional quality information of a second tunnel 105 between the first client pre-device 101 and the third client pre-device 103, which are transmitted by the first client pre-device 101, the second client pre-device 102 and the third client pre-device 103 in a predetermined monitoring period;

a tunnel scoring unit 802, configured to calculate, by the SD-WAN controller 106, a first quality score of the first tunnel 104 and a second quality score of the second tunnel 105 according to the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, and perform attenuation correction on the first quality score and the second quality score, so as to calculate a first attenuation score of the first tunnel 104 and a second attenuation score of the second tunnel 105;

A tunnel switching unit 803, configured to determine a current optimal tunnel from the first tunnel 104 and the second tunnel 105 according to a comparison between the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105 in a certain period of time by using the SD-WAN controller 106, and control the first client front-end device 101 to switch the primary link tunnel to the current optimal tunnel.

In one embodiment, the bidirectional quality information of the first tunnel 104 between the first client pre-device 101 and the second client pre-device 102 and the bidirectional quality information of the second tunnel 105 between the first client pre-device 101 and the third client pre-device 103 comprise a first quality information of the first tunnel 104 in a first direction and a second quality information of the second tunnel in a second direction and a third quality information of the second tunnel 105 in the first direction and a fourth quality information of the second tunnel in the second direction, respectively.

In one embodiment, on the basis of any of the foregoing embodiments, the tunnel scoring unit 802 is further configured to:

the SD-WAN controller 106 calculates a first quality score of the first tunnel 104 based on a binary continuous function operation of the first quality information of the first tunnel 104 in the first direction and the second quality information of the second direction;

A second quality score of the second tunnel 105 is calculated based on a binary continuous function operation of the third quality information of the first direction and the fourth quality information of the second direction of the second tunnel 105.

the first quality score calculated in the current monitoring period is weighted and summed with the first attenuation score of the first tunnel 104 calculated in the last monitoring period based on an attenuation factor, and the first attenuation score of the first tunnel 104 in the current monitoring period is calculated;

and carrying out weighted summation on the second quality score calculated in the current monitoring period and the second attenuation score of the second tunnel 105 calculated in the last monitoring period based on an attenuation factor, and calculating to obtain the second attenuation score of the second tunnel 105 in the current monitoring period.

In an embodiment, on the basis of any of the foregoing embodiments, the tunnel switching unit 803 is further configured to:

the SD-WAN controller 106 determines whether the difference between the first decay score and the second decay score continuously increases or the difference between the first decay score and the second decay score is greater than a predetermined threshold for a predetermined metric period, wherein the metric period is greater than the monitoring period;

The switching device of the SD-WAN network tunnel in the embodiment of the present application receives, through the SD-WAN controller 106, the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, which are sent by the first client pre-device 101, the second client pre-device 102, and the third client pre-device 103 in a predetermined monitoring period; respectively calculating a first quality score of the first tunnel 104 and a second quality score of the second tunnel 105 according to the bidirectional quality information of the first tunnel 104 and the bidirectional quality information of the second tunnel 105, performing attenuation correction on the first quality score and the second quality score, and calculating a first attenuation score of the first tunnel 104 and a second attenuation score of the second tunnel 105; and determining the current optimal tunnel in the first tunnel 104 and the second tunnel 105 according to the comparison of the first attenuation score of the first tunnel 104 and the second attenuation score of the second tunnel 105 in a certain time period, and controlling the first client front-end equipment 101 to switch the primary link tunnel to the current optimal tunnel. Therefore, on one hand, the method and the device can reduce the problem of frequent tunnel switching caused by tunnel network quality fluctuation in the SD-WAN network, and avoid access link oscillation of the client front-end equipment; on the other hand, when the tunnel network quality of the main link of the SD-WAN network is continuously deteriorated but does not reach the switching threshold, the main link tunnel can be timely switched to the current optimal tunnel according to the comparison of the attenuation scores of the tunnel quality of the main link and the standby link, so that the communication quality of the access link of the client front-end equipment is improved to the greatest extent.

Fig. 10 is a schematic structural diagram of a switching device of an SD-WAN network tunnel according to a second embodiment of the present application. As shown in fig. 10, the switching device of the SD-WAN network tunnel in the embodiment of the present application may include the following units:

a tunnel monitoring unit 901, configured to receive, by using the SD-WAN controller 106, bidirectional quality information of at least two tunnels between each of the plurality of client pre-devices and other client pre-devices, where the plurality of client pre-devices send in a predetermined monitoring period;

a tunnel scoring unit 902, configured to calculate a quality score of each of the at least two tunnels according to bidirectional quality information of at least two tunnels between the client pre-devices and other client pre-devices, and perform attenuation correction on the quality score, so as to calculate an attenuation score of each of the at least two tunnels;

a tunnel switching unit 903, configured to determine a current optimal tunnel of the at least two tunnels according to a comparison of attenuation scores of each tunnel in the at least two tunnels in a certain period of time by using the SD-WAN controller 106, and control each client front-end device to switch the primary link tunnel to the current optimal tunnel.

In one embodiment, on the basis of any one of the foregoing embodiments, the tunnel scoring unit 902 is further configured to:

In one embodiment, on the basis of any of the foregoing embodiments, the tunnel switching unit 903 is further configured to:

the SD-WAN controller 106 determines whether the difference between the attenuation score of the active link tunnel and the minimum attenuation score in the other tunnels continuously increases or the difference is greater than a predetermined threshold for a predetermined metric period, wherein the metric period is greater than the monitoring period;

The switching device of the SD-WAN network tunnel in the embodiment of the present application receives, through the SD-WAN controller 106, bidirectional quality information of at least two tunnels between each client pre-device and other client pre-devices in the plurality of client pre-devices sent by the plurality of client pre-devices in a predetermined monitoring period; the SD-WAN controller 106 calculates a quality score of each of the at least two tunnels according to the bidirectional quality information of the at least two tunnels between each client pre-device and other client pre-devices, and performs attenuation correction on the quality score, so as to calculate an attenuation score of each of the at least two tunnels; the SD-WAN controller 106 determines a current optimal tunnel of the at least two tunnels according to the comparison of the attenuation scores of each tunnel in the at least two tunnels in a certain period of time, and controls each client front-end device to switch the primary link tunnel to the current optimal tunnel. Therefore, on one hand, the method and the device can reduce the problem of frequent tunnel switching caused by tunnel network quality fluctuation in the SD-WAN network, and avoid access link oscillation of any client front-end equipment; on the other hand, when the tunnel quality of the primary link of any client front-end equipment in the SD-WAN network is continuously deteriorated but does not reach the switching threshold value, the primary link tunnel can be timely switched to the current optimal tunnel according to the comparison of the attenuation scores of the tunnel quality of the primary link and the standby link, so that the communication quality of the access link of any client front-end equipment is improved to the greatest extent.

It should be noted that, as those skilled in the art can understand, the different embodiments described in the method embodiments of the present application, the explanation and the achieved technical effects thereof are also applicable to the device embodiments of the present application, and are not repeated herein.

Further, the embodiment of the application also provides an electronic device, which may include: a processor and a memory. Wherein the memory stores computer program instructions that the processor may invoke in the memory to perform all or part of the steps of the methods described in any of the embodiments of the present application. The computer program instructions in the memory described above may be embodied in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product.

Further, the present application also provides a computer program product comprising a non-transitory computer readable storage medium storing a computer program capable of performing all or part of the steps of the method of any of the embodiments of the present application when the computer readable storage medium is connected to a computer device, the computer program being executed by one or more processors of the computer device.

Further, the present application also provides a non-transitory computer readable storage medium having stored thereon a computer program executable by one or more processors to perform all or part of the steps of the methods described in any of the embodiments of the present application.

From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments of the present application may be implemented by software or by a combination of software and necessary general hardware platforms, and of course may be implemented by hardware functions. Based on such understanding, the technical solutions of the present application may be embodied in essence or in a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device, including for example but not limited to a personal computer, a server, or a network device, to perform all or part of the steps of the method of any of the embodiments of the present application. The aforementioned storage medium may include: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic or optical disk, or other various media capable of storing computer program code.

The above describes exemplary embodiments of the present application, it should be understood that the above-described exemplary embodiments are not limiting, but rather illustrative, and the scope of the present application is not limited thereto. It will be appreciated that modifications and variations to the embodiments of the present application may be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations are intended to be within the scope of the present application.

Claims

1. The switching method of the SD-WAN network tunnel is applied to an SD-WAN controller and is characterized by comprising the following steps of:

2. The method for switching an SD-WAN network tunnel according to claim 1, wherein the SD-WAN controller calculates a first quality score of the first tunnel and a second quality score of the second tunnel according to the bidirectional quality information of the first tunnel and the bidirectional quality information of the second tunnel, respectively, comprising:

3. The method for switching between SD-WAN network tunnels according to claim 2, wherein said SD-WAN controller determines the current optimal tunnel of said first tunnel and said second tunnel based on a comparison of a first decay score of said first tunnel and a second decay score of said second tunnel over a period of time, comprising:

4. A method of switching SD-WAN network tunnels according to claim 3, wherein the SD-WAN controller controls the first client pre-device to switch the active link tunnel to the current optimal tunnel, comprising:

5. The method according to claim 4, wherein the first quality information and the second quality information include a maximum delay time and a maximum jitter time of the first tunnel in the first direction and the second direction in the monitoring period, respectively, and the third quality information and the fourth quality information include a maximum delay time and a maximum jitter time of the second tunnel in the first direction and the second direction in the monitoring period, respectively.

6. The method according to claim 5, wherein the SD-WAN controller calculates the first quality score based on a binary continuous function operation of first quality information in a first direction and second quality information in a second direction of the first tunnel; calculating the second quality score based on binary continuous function operation of third quality information of the first direction and fourth quality information of the second direction of the second tunnel, including:

7. The switching method of the SD-WAN network tunnel is applied to an SD-WAN controller and is characterized by comprising the following steps of:

8. A switching device of an SD-WAN network tunnel, applied to an SD-WAN controller, comprising:

9. A switching device of an SD-WAN network tunnel, applied to an SD-WAN controller, comprising: