CN111835639A - SD-WAN network intelligent link selection method based on cloud computing - Google Patents
SD-WAN network intelligent link selection method based on cloud computing Download PDFInfo
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Abstract
An SD-WAN network intelligent link selection method based on cloud computing belongs to the technical field of networks. The method is applied to the client device and comprises the following steps: step S10, establishing a plurality of communication links between the client device and a plurality of edge routers deployed in the cloud environment; step S20, detecting the network status of each communication link; step S30, according to the detected network condition, evaluating the quality grade of each link; step S40, according to the quality grade of each link, determining one of the links with the highest quality grade as a main link and the other links as standby links; and step S50, setting the route of the client device according to the determined main link and the standby link. The invention evaluates the network quality grade in time through periodic active detection, intelligently selects a relatively optimal link for the network, and fully considers the actual use requirements of users.
Description
Technical Field
The invention belongs to the technical field of networks, and particularly relates to an SD-WAN network intelligent link selection method based on cloud computing.
Background
Two basic components of a traditional enterprise network: (1) network devices such as routers, switches, VPN gateways, etc.; (2) MPLS/MSTP and other enterprise-level line resources. Although the line resources can satisfy a certain SLA (Service level agent, defined by delay, packet loss rate, jitter, bandwidth, etc.), in reality, the network environment changes constantly and is very complex, and even if there is a combination of good network equipment and high-quality line resources, IT cannot be guaranteed that the enterprise IT application can obtain a satisfactory effect, for example: (1) network resources cannot be reasonably utilized, for example, during the peak period of network access, network congestion occurs, line resources are not enough, and in the idle period, expensive network dedicated lines cannot be fully utilized; (2) the network quality is not satisfactory, the network is unstable, the internet speed is slow, and the like, and although an enterprise can improve the network experience by purchasing line resources with higher-level SLAs, the cost is inevitably increased.
The application of the SD-WAN technology solves the problems to a great extent, so that network resources of enterprises are utilized more fully, and the network quality is improved more greatly. To a certain extent, the SD-WAN operation network is a substitute for enterprise-level line resources, and the SD-WAN CPE (Customer personal Equipment, hereinafter referred to as CPE) is a substitute for various enterprise-network WAN side devices. The SD-WAN operation network can provide a stable and high-quality network for users at the cloud end, but the network stability between a user gateway (CPE) and the SD-WAN cloud network cannot be guaranteed. At present, a common method is to provide multiple links between a CPE and an SD-WAN cloud network, that is, the CPE establishes a connection with multiple VPEs (Virtual Provider Edge, Edge routers of a service Provider backbone network, deployed on a cloud, including a public cloud and a private cloud), selects one of the links as a main link, and selects a backup link only when the main link is disconnected. Due to the fact that the network environment changes from moment to moment, the main link may not be the optimal link from the CPE to the SD-WAN cloud network.
The invention patent CN201210539033.4 discloses a method for switching between a main link and a standby link, and specifically discloses a method applied to a wireless routing device, where the wireless routing device dials through a first wireless modem module to access the main link and dials through a second wireless modem module to access the standby link, and the method includes the following steps: A. establishing a uniform link signal quality judgment standard for judging the signal quality of the main link and the standby link, and setting a switching condition according to the signal quality of the links; B. detecting the signal quality of the main link and the standby link in real time; C. when the detected signal quality is judged to meet the set switching condition, starting a switching program to switch the main link and the standby link; the link signal quality judgment standard is as follows: within the set or configured time y1, if the current signal strength values s read in the time exceeding a certain proportion z1 are all lower than a lower threshold value x1 of signal strength, determining that the link signal quality is poor, wherein z1 is the set or configured percentage of time for determining that the link signal quality meets the lower threshold value x 1; within the set or configured time y2, if the current signal strength values s read in the time exceeding a certain proportion of z2 are all higher than the signal strength upper threshold value x2, the link signal quality is judged to be good, and z2 is the set or configured time percentage for judging that the link signal quality meets the upper threshold value x 2; the x1 and x2 are configurable in manual mode and dynamically calculated in automatic mode. The method is applied to wireless routing equipment, and the main link and the standby link are predetermined and are switched and selected by judging the signal quality of the links.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the SD-WAN network intelligent link selection method based on cloud computing, so that the main link between the client equipment and the SD-WAN cloud network can be dynamically adjusted according to the real-time state of the network link, the network speed is increased, and the user experience is improved.
The invention is realized by the following technical scheme:
a SD-WAN network intelligent link selection method based on cloud computing is applied to client equipment and comprises the following steps:
step S10, establishing a plurality of communication links between the client device and a plurality of edge routers deployed in the cloud environment;
step S20, detecting the network status of each communication link;
step S30, according to the detected network condition, evaluating the quality grade of each link;
step S40, according to the quality grade of each link, determining one of the links with the highest quality grade as a main link and the other links as standby links;
and step S50, setting the route of the client device according to the determined main link and the standby link.
The Virtual Provider Edge (VPE) is deployed in a cloud environment and provides a plurality of optional link exits for client equipment, and the VPE is also an entrance of an SD-WAN cloud network. An IPSec VPN tunnel is established between the client device and the VPEs, the IPSec VPN provides a secure communication channel for the two private networks on the public network, and the security of the connection between the client device and the VPEs is ensured through an encryption channel. The client device deployed at the enterprise network outlet serves as an enterprise gateway, and the optimal link from the current client device to the SD-WAN cloud network can be intelligently selected for a user, so that the safety and stability of the network are ensured.
Preferably, the client device is a CPE device or a VCPE device.
The method is suitable for CPE Equipment and VCPE (Virtual Customer experience Equipment, VCPE for short, Linux host based on x86 platform or docker service mirror).
Preferably, step S20 includes:
step S21, sending periodic detection instructions to each link to obtain the detection results of each communication link;
step S22, according to the detection result, obtaining the packet loss rate, the average delay value, and the jitter value of each link, and obtaining the bandwidth ratio of each link.
Preferably, step S30 includes:
step S31, according to the detected network state, including packet loss rate, average delay value, jitter value, respectively comparing the packet loss rate evaluation standard table, average delay value evaluation standard table, jitter value evaluation standard table, determining the packet loss evaluation level, average delay evaluation level, jitter evaluation level of each link;
in step S32, according to the bucket law, the worst level among the packet loss evaluation level, the average delay evaluation level, and the jitter evaluation level in each link is used as the quality level of the link, and the quality levels of all links are determined in this way.
Preferably, the step S31 includes:
step S311, according to the network state of the periodic detection, each link has packet loss rate, average delay value and jitter value of a plurality of periodic detections; determining the weighted packet loss rate, the weighted average delay value and the weighted jitter value of each link according to a weighting algorithm;
step S312, comparing the packet loss rate determined by each link with the packet loss rate evaluation standard table to obtain the packet loss evaluation grade of each link; comparing the average delay value determined by each link with an average delay value evaluation standard table to obtain the average delay evaluation grade of each link; and comparing the jitter value determined by each link with a jitter value evaluation standard table to obtain the jitter evaluation grade of each link.
Preferably, step S40 includes:
when one of the following conditions A, B, C is detected, according to the quality level of each link, determining one of the links with the highest quality level as a main link and the others as standby links:
A. a main link is not set in the current network;
B. the link with the changed quality level in the current network is a current main link, and the quality level of the current main link becomes lower and the network is unavailable;
C. the link with the changed quality level in the current network is the current main link, and the quality level of the current main link becomes low and the network is in a busy state.
Preferably, when two or more links with the highest quality level in each link are available, the link with the optimal evaluation level is selected as the main link according to the evaluation levels of key options of the links, wherein the key options are one of packet loss, average delay and jitter.
Preferably, case C includes: and when detecting that the link with the changed quality level in the current network is the current main link, the quality level of the current main link is lowered and the network is in a busy state, selecting the link with the highest quality level in the current standby link according to the quality level of each link, and if the quality level of the current standby link is higher than the quality level of the current main link and the bandwidth of the current standby link is larger than the bandwidth of the current main link, selecting the current standby link as the main link.
Preferably, the step S40 further includes: when detecting that a link with a changed quality level in the current network is a current standby link, the quality level of the current standby link is higher and is equal to the quality level of a current main link, the current main link meets the condition that the bandwidth ratio of the current main link is lower than the threshold value of the bandwidth ratio, and the current standby link meets the condition that the evaluation level of the key option of the current standby link is better than the evaluation level of the same key option of the current main link, selecting the current standby link as the main link; the key option is one of packet loss, average delay and jitter.
Preferably, the step S40 further includes:
when detecting that a link with a changed quality grade in the current network is a standby link, the quality grade of the current standby link is higher than the quality grade of the current main link, and the current standby link meets the condition that the bandwidth of the current standby link is larger than the bandwidth of the current main link, selecting the current standby link as the main link;
and when the link with the changed quality level in the current network is detected to be a standby link, the quality level of the current standby link is higher than the quality level of the current main link, the current standby link meets the condition that the bandwidth of the current standby link is less than or equal to the bandwidth of the current main link, and the current main link meets the conditions that the bandwidth ratio of the current main link is less than the bandwidth ratio threshold and the network flow of the current main link is less than the bandwidth of the current standby link, selecting the current standby link as the main link.
Preferably, the step S40 further includes:
when one of the following conditions a, b, c, d and e is detected, determining that the current main link is still the main link:
a. the link with the changed quality level in the current network is the current main link, and the quality level of the current main link is high;
b. the link with the changed quality level in the current network is the current standby link, and the quality level of the current standby link becomes lower;
c. the link with the changed quality grade in the current network is a current standby link, and the quality grade of the current standby link is higher and is smaller than that of the current main link;
d. the link with the changed quality level in the current network is a current standby link, the quality level of the current standby link is higher and equal to the quality level of the current main link, and the condition that the bandwidth ratio of the current main link is lower than the bandwidth ratio threshold value or the condition that the evaluation level of the key option of the current standby link is higher than the evaluation level of the same key option of the current main link cannot be met, wherein the key option is one of packet loss, average delay and jitter;
e. the link with the changed quality level in the current network is a standby link, the quality level of the current standby link becomes higher and is higher than the quality level of the current main link, and the condition that the bandwidth of the current standby link is less than or equal to the bandwidth of the current main link, the condition that the bandwidth ratio of the current main link is lower than the bandwidth ratio threshold value or the condition that the network flow of the current main link is less than the bandwidth of the current standby link cannot be met.
Preferably, the step S50 includes:
if the main link and the standby link are not set in the current network, setting the route of the client device according to the main link and the standby link determined in the step S40;
if the main link and the standby link are set in the current network and changed, the original route setting is deleted, and the route of the client device is set according to the main link and the standby link determined again in step S40.
The invention has the following beneficial effects:
an SD-WAN network intelligent link selection method based on cloud computing,
(1) the method can intelligently select the relatively optimal link for the SD-WAN network, improve the network speed and improve the user experience. According to the method, each routing is carried out, the current quality is selected to be the best, and the actual use requirement of a user is considered.
(2) Network oscillation is reduced, and the network environment is stabilized. Network environment changes thousands, instantaneous oscillation of a certain link should not cause link change, otherwise frequent link change can cause network oscillation. When the link level is evaluated, weighted packet loss rate, average delay and jitter are used instead of the last link packet loss rate, average delay and jitter, so that network oscillation is reduced to a great extent, and in addition, the network is more stable due to the balance of bandwidth proportion.
Drawings
Fig. 1 is a general flowchart of an SD-WAN network intelligent link selection method based on cloud computing according to the present invention;
FIG. 2 is a diagram of SD-WAN cloud network topology.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the invention relates to a method for selecting an SD-WAN network intelligent link based on cloud computing, which is applied to a client device, and the method comprises:
step S10, establishing a plurality of communication links between the client device and a plurality of edge routers deployed in the cloud environment;
step S20, detecting the network status of each communication link;
step S30, according to the detected network condition, evaluating the quality grade of each link;
step S40, according to the quality grade of each link, determining one of the links with the highest quality grade as a main link and the other links as standby links;
and step S50, setting the route of the client device according to the determined main link and the standby link.
Before executing steps S20-S50, an SD-WAN network environment is constructed. After the network environment is constructed, the intelligent link selection process can be executed according to the steps S20-S50. In step S10, the SD-WAN network environment is mainly constructed by the client device and a plurality of edge routers deployed in the cloud environment, and an IPSec VPN tunnel is constructed between the client device and the edge routers, where the tunnel is a secure communication channel and can ensure secure communication between the client device and the edge routers. The client device may be a CPE device or a VCPE device (fig. 2 shows a network topology diagram of a communication connection between the CPE device and the VPE device, and a communication connection between the VCPE device and the VPE device). The method is not limited to the SD-WAN network constructed by only CPE equipment and a plurality of VPE equipment, or the SD-WAN network constructed by only VCPE equipment and a plurality of VPE equipment, or the SD-WAN network simultaneously constructed by CPE equipment and VCPE equipment and a plurality of VPE equipment respectively.
In step S20, the network condition of the communication link is detected by the client device, primarily detecting the IPSec VPN link. Specifically, the step S20 includes:
step S21, sending periodic detection instructions to each link to obtain the detection results of each communication link;
step S22, according to the detection result, obtaining the packet loss rate, the average delay value, and the jitter value of each link, and obtaining the bandwidth ratio of each link.
The client device comprises a network detection module for actively initiating a periodic detection instruction, such as an ICMP message or a UDP packet, to each link, and the detection destination is a VPE device. A certain number of packets are sent in each period, for example, 20 packets are sent in one period, and the period is 5 seconds. And then, according to the detection result, obtaining the packet loss rate, the average delay value and the jitter value of the detection message of each link. And in addition, the bandwidth ratio of each link is obtained, and the higher the bandwidth ratio is, the more busy the link is.
Specifically, the method for calculating the bandwidth ratio includes: assuming that the link receives a message r, the total message sent is s, the probing period is t, the bandwidth is B, and the bandwidth ratio is B between two probes, the calculation formula is as follows:
。
when the client device receives the detection result, step S30 is executed. Specifically, step S30 includes:
step S31, according to the detected network state, including packet loss rate, average delay value, jitter value, respectively comparing the packet loss rate evaluation standard table, average delay value evaluation standard table, jitter value evaluation standard table, determining the packet loss evaluation level, average delay evaluation level, jitter evaluation level of each link;
in step S32, according to the bucket law, the worst level among the packet loss evaluation level, the average delay evaluation level, and the jitter evaluation level in each link is used as the quality level of the link, and the quality levels of all links are determined in this way.
The packet loss rate evaluation standard table is a table in which packet loss rates and packet loss rate evaluation levels are stored in a one-to-one correspondence manner, the average delay value evaluation standard table is a table in which average delay values and average delay value evaluation levels are stored in a one-to-one correspondence manner, and the jitter value evaluation standard table is a table in which jitter values and jitter value evaluation levels are stored in a one-to-one correspondence manner. The packet loss rate evaluation standard table, the average delay value evaluation standard table and the jitter value evaluation standard table are stored in the client device after being preset. The evaluation criterion can be set according to actual conditions, for example, the network packet loss setting criterion mainly refers to the packet loss rate. And (3) excellent: the packet loss rate is 0; good: the packet loss rate is (0,5% ], the difference is the packet loss rate is (5%,90% ]), the unavailability is the packet loss rate is (90%, 100% ], for example, the network average delay can be set to be standard, the excellence is [0, 60ms ], the excellence is (60 ms,120 ms), the difference is (120 ms,300 ms), the unavailability is more than 300ms, for example, the jitter has a large influence on real-time communication, and the evaluation standard can be set according to the actual use requirement.
The client device also comprises a link evaluation module, and after receiving the detection result obtained by the network detection module, the link evaluation module can evaluate the quality of the current link according to the packet loss rate, the average delay value and the jitter value obtained by the link in the latest period; the quality of the current link can also be evaluated according to the packet loss rate, the average delay value and the jitter value obtained by detecting the last 10 periods of the link (or adjusting the times according to the needs). When the values of the plurality of detection periods are adopted, the step S31 includes:
step S311, according to the network state of the periodic detection, each link has packet loss rate, average delay value and jitter value of a plurality of periodic detections; determining the weighted packet loss rate, the weighted average delay value and the weighted jitter value of each link according to a weighting algorithm;
step S312, comparing the packet loss rate determined by each link with the packet loss rate evaluation standard table to obtain the packet loss evaluation grade of each link; comparing the average delay value determined by each link with an average delay value evaluation standard table to obtain the average delay evaluation grade of each link; and comparing the jitter value determined by each link with a jitter value evaluation standard table to obtain the jitter evaluation grade of each link.
In step S311, the weighting algorithm may determine the ratio of the detected values in each period according to the weights, and then calculate a more accurate and reasonable final value for determining the evaluation level in step S312.
After each detection period is finished, the network detection module stores the detection data, and the evaluation module evaluates the link. The link evaluation module calculates weighted jitter value, packet loss rate and average delay value according to a certain weighting mode by taking the latest n times of detection results on the link, the weighting mode can be adjusted according to needs, generally speaking, the newer detection data has higher weight, after the weighted data is obtained, the level of each data falling into the evaluation standard is seen, and according to the bucket law, the worst level in the three weighted data is taken as the quality level of the current link.
The calculation formula of the weighting algorithm is as follows:
wherein,
is the most recently j-th acquired detection value,
is the weight corresponding to the j-th most recent probe, n is the total number of weighted calculations, and
is the final weight.
The weighting algorithm is illustrated by taking the average delay as an example. Taking n as 10, setting the weight of the weighting parameter
: {1%, 1%,2%, 3%, 5%, 5%, 8%, 10%, 20%, 45% }, i.e. the newly detected data weight is 45%, the weight of the second time is 20% and the third time is 10%, and so on, the earliest detection weight is the smallest, 1%.
Average delay data obtained from the last 10 detections
: { 37.314, 36.638, 38.194, 37.900,38.883, 37.550, 38.040, 38.162, 39.233, 36.809} (in ms), the weighted average delay calculation method is as follows: 37.314 + 1% +36.638 + 1% +38.194 + 2% +37.900 + 3% +38.883 + 5% +37.550 + 5% +38.040 + 8% +38.162 + 10% +39.233 + 20% + 36.809% =37.732
The link weighted average delay was calculated to be 37.732ms, which is the best rating in the evaluation criteria.
According to the method, the weighted jitter value and the packet loss rate can be calculated, and the level of the evaluation standard is respectively judged, each link has the three weighted data, and the level with the worst weighted data is selected as the quality level of the current link, so that the quality levels of all the links are determined.
And the client equipment selects the optimal link as a main link and other links as standby links according to the link quality grade. Specifically, step S40 includes: when one of the following conditions A, B, C is detected, according to the quality level of each link, determining one of the links with the highest quality level as a main link and the others as standby links:
A. a main link is not set in the current network;
B. the link with the changed quality level in the current network is a current main link, and the quality level of the current main link becomes lower and the network is unavailable;
C. the link with the changed quality level in the current network is the current main link, and the quality level of the current main link becomes low and the network is in a busy state.
In case a, the current network is a newly established network or a reestablished network, and a primary link is not set, a primary link and a standby link need to be selected based on the quality level of the link. In this case we choose { Q }idleThe highest link in the tree. When two or more links with the highest quality level are selected, selecting the link with the optimal evaluation level as a main link according to the evaluation levels of key options of the links, wherein the key options are one of packet loss, average delay and jitter. For example, if the user cares about the quality of real-time communication, the jitter may be selected as a key option, and when a plurality of links with the same quality level are encountered, the link with the minimum jitter is selected as the final main link. According to this selection rule, the main link is the one with the best network conditions among all the links currently.
In case B, the link with the changed quality level in the current network is the current primary link, and the quality level of the current primary link becomes lower and the network is unavailable, that is, the link level of the current primary link is 0, the primary link needs to be reselected immediately, and according to the quality level of each link, one link with the highest quality level in each link is determined to be the primary link, and the other links are the standby links. When two or more links with the highest quality level are selected, selecting the link with the optimal evaluation level as a main link according to the evaluation levels of key options of the links, wherein the key options are one of packet loss, average delay and jitter.
In case C, the link whose quality level changes in the current network is the current main link, and the quality level of the current main link becomes low and the network is in a busy state, i.e. the level of the current link is greater than 0. And selecting one of the current standby links with the highest quality grade according to the quality grade of each link, and selecting the current standby link as the main link if the quality grade of the current standby link is higher than the quality grade of the current main link and the bandwidth of the current standby link is larger than that of the current main link. Specifically, when the condition C occurs, the bandwidth ratio of the link is first looked up, and if the bandwidth ratio is high, it indicates that the link quality is reduced because the network is busy, in this case, an available link needs to be searched for by a standby link having a larger bandwidth than the current main link. And if the link quality grade in the standby link is higher than that of the main link and the bandwidth is larger than that of the main link, selecting the standby link as a new main link.
The step S40 further includes: when the link with the changed quality grade in the current network is detected to be the current standby link, and the quality grade of the current standby link is higher and equal to the quality grade Q of the current main linknew=QmainAnd the current primary link meets the condition that the bandwidth ratio of the current primary link is lower than the bandwidth ratio threshold (for example, the bandwidth ratio threshold is 30%, and the bandwidth ratio b of the current primary link is lower than 30%), and when the current standby link meets the condition that the evaluation grade of the key option of the current standby link is better than the evaluation grade of the same key option of the current primary link, the current standby link is selected as the primary link; the key option is one of packet loss, average delay and jitter.
The step S40 further includes:
when the link with the changed quality grade in the current network is detected to be a standby link, and the quality grade of the current standby link becomes higher and is greater than the quality grade Q of the current main linknew>QmainAnd the current standby link satisfies that the bandwidth of the current standby link is larger than the bandwidth B of the current main linknew>BmainWhen the condition is met, selecting the current standby link as a main link;
when the link with the changed quality grade in the current network is detected to be a standby link, and the quality grade of the current standby link becomes higher and is greater than the quality grade Q of the current main linknew>QmainAnd the current standby link meets the condition that the bandwidth of the current standby link is less than or equal to the bandwidth B of the current main linknew≤ BmainAnd the current primary link meets the conditions that the bandwidth ratio of the current primary link is lower than the bandwidth ratio threshold (for example, the bandwidth ratio threshold is 30%, and the bandwidth ratio B of the current primary link is lower than 30%) and the network traffic of the current primary link is smaller than the bandwidth B of the current standby linknewAnd if so, selecting the current standby link as the main link.
The step S40 further includes:
when one of the following conditions a, b, c, d and e is detected, determining that the current main link is still the main link:
a. the link with the changed quality level in the current network is the current main link, and the quality level of the current main link is high;
b. the link with the changed quality level in the current network is the current standby link, and the quality level of the current standby link becomes lower;
c. the link with the changed quality grade in the current network is a current standby link, and the quality grade of the current standby link is higher and is smaller than that of the current main link;
d. the link with the changed quality level in the current network is a current standby link, the quality level of the current standby link is higher and equal to the quality level of the current main link, and the condition that the bandwidth ratio of the current main link is lower than the bandwidth ratio threshold value or the condition that the evaluation level of the key option of the current standby link is higher than the evaluation level of the same key option of the current main link cannot be met, wherein the key option is one of packet loss, average delay and jitter;
e. the link with the changed quality level in the current network is a standby link, the quality level of the current standby link becomes higher and is higher than the quality level of the current main link, and the condition that the bandwidth of the current standby link is less than or equal to the bandwidth of the current main link, the condition that the bandwidth ratio of the current main link is lower than the bandwidth ratio threshold value or the condition that the network flow of the current main link is less than the bandwidth of the current standby link cannot be met.
In the above cases a, b, and c, if the quality level of the main link in the current network is still the highest among all links, the main link does not need to be reselected. The d and e conditions are determined after comparison, even if the quality level of the link exceeds the quality level of the current main link, if the condition of bandwidth ratio or key option is not met under the d condition, the current main link is still selected as the main link; and if the condition of the bandwidth or the bandwidth ratio or the network flow is not met under the condition of e, the current main link is still selected as the main link.
Based on whether the network sets the primary link and the standby link, step S50 specifically includes:
if the main link and the standby link are not set in the current network, setting the route of the client device according to the main link and the standby link determined in the step S40;
if the main link and the standby link are set in the current network and changed, the original route setting is deleted, and the route of the client device is set according to the main link and the standby link determined again in step S40.
The client device also comprises a link selection module used for selecting the current optimal link as the main link according to the evaluation grade of each link obtained by the link evaluation module. The client device also comprises a route selecting module, and the route of the client device is set according to the result of the link selecting module.
The currently used link is called a main link, and the quality grade of the main link is set as QmainAnd the unused link is called the standby link, and the link quality level is { Q }idleThere may be more than one, and the latest changing link quality level is Qnew. When the client device executes step S40, the link selection step is as follows:
and detecting whether a main link exists in the current network, if no main link exists, selecting the main link according to the quality grade of the link obtained by calculation in the steps S20 and S30. And (4) selecting the link with the highest quality grade as a main link and the other links as standby links according to a selection principle. And when more than one link with the highest link quality grade exists, determining the main link according to the optimal evaluation grade of the key options.
When detecting that a main link exists in the current network, whether the quality grade changes is the main link or the standby link needs to be detected. And if the link is the main link, judging the situation according to the situation.
If the link level becomes high, the link does not need to be changed; if the link level becomes low and the link level is 0, indicating that the network is not available, it is necessary to immediately reroute the link according to the quality levels of the links calculated in steps S20 and S30, and to take the link with the highest quality level as the main link.
If the link level becomes low but the value is still greater than 0, the bandwidth ratio of the link is looked up first, and if the bandwidth ratio is high, the link quality is reduced because the network is busy, in which case, an available link needs to be searched for by a standby link which is wider than the current main link. If the link quality grade in the standby link is larger than that of the main link and the bandwidth is larger than that of the main link, the standby link is selected as a new main link, the route is reset, and the link selection module informs the route selection module of switching the route.
If the newly changed link is a standby link and the link quality level is low, there is no need to reselect the primary link.
If the newly changed link is an idle link and the link quality level is high, a case-by-case selection is required.
If the new link quality level is less than the main link quality level, the main link does not need to be reselected;
if the new link quality level is equal to the primary link level, then the primary link bandwidth is to be seen. If the bandwidth occupation ratio is low (for example, the bandwidth occupation ratio is less than 30%, the network is idle), key options of the main link and the new link are compared, if the key option of the new link is better than that of the main link, the route needs to be reset, the link selection module informs the route selection module to switch the route, and the link does not need to be switched in other situations;
if the quality level of the new link is higher than the quality level of the main link, comparing the bandwidths of the main link and the new link, if the bandwidth ratio of the new link is larger, switching the current route, otherwise, looking at the bandwidth ratio of the main link, if the bandwidth ratio of the main link is very low (such as the bandwidth ratio is less than 30 percent, the network is idle), and the network flow of the main link does not exceed the bandwidth of the new link, resetting the route, switching the route, and otherwise, not switching the route.
And after receiving the route switching notification of the link selection module, the route selection module deletes the route of the old link and adds a new link route to complete the link selection. If no handover is received, no route re-setup is required.
According to the intelligent link selection method of the client equipment in the SD-WAN network environment based on the cloud computing system, provided by the invention, the network quality grade is evaluated in time through periodic active detection, the relatively optimal link is intelligently selected for the network, and the actual use requirements (such as the setting of key options) of a user are fully considered. The weighted packet loss rate, the average delay and the jitter are used instead of the packet loss rate, the average delay and the jitter of the latest link, so that the network oscillation is reduced to a great extent, and in addition, the balance of the bandwidth of the main link and the bandwidth ratio when the link is selected can also make the network more stable, and the network experience of a user is improved.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (12)
1. A SD-WAN network intelligent link selection method based on cloud computing is applied to client equipment and is characterized by comprising the following steps:
step S10, establishing a plurality of communication links between the client device and a plurality of edge routers deployed in the cloud environment;
step S20, detecting the network status of each communication link;
step S30, according to the detected network condition, evaluating the quality grade of each link;
step S40, according to the quality grade of each link, determining one of the links with the highest quality grade as a main link and the other links as standby links;
and step S50, setting the route of the client device according to the determined main link and the standby link.
2. The cloud-computing-based SD-WAN network intelligent link selection method as claimed in claim 1, wherein said client device is a CPE device or a VCPE device.
3. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 1, wherein step S20 includes:
step S21, sending periodic detection instructions to each link to obtain the detection results of each communication link;
step S22, according to the detection result, obtaining the packet loss rate, the average delay value, and the jitter value of each link, and obtaining the bandwidth ratio of each link.
4. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 1, wherein step S30 includes:
step S31, according to the detected network state, including packet loss rate, average delay value, jitter value, respectively comparing the packet loss rate evaluation standard table, average delay value evaluation standard table, jitter value evaluation standard table, determining the packet loss evaluation level, average delay evaluation level, jitter evaluation level of each link;
in step S32, according to the bucket law, the worst level among the packet loss evaluation level, the average delay evaluation level, and the jitter evaluation level in each link is used as the quality level of the link, and the quality levels of all links are determined in this way.
5. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 4, wherein said step S31 includes:
step S311, according to the network state of the periodic detection, each link has packet loss rate, average delay value and jitter value of a plurality of periodic detections; determining the weighted packet loss rate, the weighted average delay value and the weighted jitter value of each link according to a weighting algorithm;
step S312, comparing the packet loss rate determined by each link with the packet loss rate evaluation standard table to obtain the packet loss evaluation grade of each link; comparing the average delay value determined by each link with an average delay value evaluation standard table to obtain the average delay evaluation grade of each link; and comparing the jitter value determined by each link with a jitter value evaluation standard table to obtain the jitter evaluation grade of each link.
6. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 1, wherein step S40 includes:
when one of the following conditions A, B, C is detected, according to the quality level of each link, determining one of the links with the highest quality level as a main link and the others as standby links:
a main link is not set in the current network;
the link with the changed quality level in the current network is a current main link, and the quality level of the current main link becomes lower and the network is unavailable;
the link with the changed quality level in the current network is the current main link, and the quality level of the current main link becomes low and the network is in a busy state.
7. The intelligent cloud-computing-based link selection method for the SD-WAN network according to claim 6, wherein when there are two or more links with the highest quality level in each link, the link with the optimal evaluation level is selected as a main link according to the evaluation level of a key option of the link, wherein the key option is one of packet loss, average delay and jitter.
8. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 6, wherein case C comprises: and when detecting that the link with the changed quality level in the current network is the current main link, the quality level of the current main link is lowered and the network is in a busy state, selecting the link with the highest quality level in the current standby link according to the quality level of each link, and if the quality level of the current standby link is higher than the quality level of the current main link and the bandwidth of the current standby link is larger than the bandwidth of the current main link, selecting the current standby link as the main link.
9. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 6, wherein the step S40 further comprises: when detecting that a link with a changed quality level in the current network is a current standby link, the quality level of the current standby link is higher and is equal to the quality level of a current main link, the current main link meets the condition that the bandwidth ratio of the current main link is lower than the threshold value of the bandwidth ratio, and the current standby link meets the condition that the evaluation level of the key option of the current standby link is better than the evaluation level of the same key option of the current main link, selecting the current standby link as the main link; the key option is one of packet loss, average delay and jitter.
10. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 6, wherein the step S40 further comprises:
when detecting that a link with a changed quality grade in the current network is a standby link, the quality grade of the current standby link is higher than the quality grade of the current main link, and the current standby link meets the condition that the bandwidth of the current standby link is larger than the bandwidth of the current main link, selecting the current standby link as the main link;
and when the link with the changed quality level in the current network is detected to be a standby link, the quality level of the current standby link is higher than the quality level of the current main link, the current standby link meets the condition that the bandwidth of the current standby link is less than or equal to the bandwidth of the current main link, and the current main link meets the conditions that the bandwidth ratio of the current main link is less than the bandwidth ratio threshold and the network flow of the current main link is less than the bandwidth of the current standby link, selecting the current standby link as the main link.
11. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 6, wherein the step S40 further comprises:
when one of the following conditions a, b, c, d and e is detected, determining that the current main link is still the main link:
a. the link with the changed quality level in the current network is the current main link, and the quality level of the current main link is high;
b. the link with the changed quality level in the current network is the current standby link, and the quality level of the current standby link becomes lower;
c. the link with the changed quality grade in the current network is a current standby link, and the quality grade of the current standby link is higher and is smaller than that of the current main link;
d. the link with the changed quality level in the current network is a current standby link, the quality level of the current standby link is higher and equal to the quality level of the current main link, and the condition that the bandwidth ratio of the current main link is lower than the bandwidth ratio threshold value or the condition that the evaluation level of the key option of the current standby link is higher than the evaluation level of the same key option of the current main link cannot be met, wherein the key option is one of packet loss, average delay and jitter;
e. the link with the changed quality level in the current network is a standby link, the quality level of the current standby link becomes higher and is higher than the quality level of the current main link, and the condition that the bandwidth of the current standby link is less than or equal to the bandwidth of the current main link, the condition that the bandwidth ratio of the current main link is lower than the bandwidth ratio threshold value or the condition that the network flow of the current main link is less than the bandwidth of the current standby link cannot be met.
12. The cloud-computing-based SD-WAN network intelligent link selection method according to claim 6, wherein said step S50 includes:
if the main link and the standby link are not set in the current network, setting the route of the client device according to the main link and the standby link determined in the step S40;
if the main link and the standby link are set in the current network and changed, the original route setting is deleted, and the route of the client device is set according to the main link and the standby link determined again in step S40.
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| CN116017604B (en) * | 2023-01-06 | 2023-09-29 | 北京国网富达科技发展有限责任公司 | Network integrated communication method and system applied to intelligent production equipment |
| CN115801551B (en) * | 2023-02-13 | 2023-04-28 | 北京徐工汉云技术有限公司 | SD-WAN network tunnel switching method and device |
| CN115801551A (en) * | 2023-02-13 | 2023-03-14 | 北京徐工汉云技术有限公司 | Switching method and device of SD-WAN (secure digital-Wide area network) network tunnel |
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| CN111835639B (en) | 2021-03-19 |
| WO2022007244A1 (en) | 2022-01-13 |
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