CN107547380B - Communication link determining method and device - Google Patents
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Abstract
The embodiment of the invention provides a method and a device for determining a communication link, which are applied to network equipment of a branch node, and the method comprises the following steps: circularly detecting the link quality of each branch node to the central node; when the cyclic detection times reach preset times, respectively calculating the average value of the link quality of each detected link; calculating the difference value of every two mean values; and when the absolute value of each difference is less than or equal to the difference threshold, determining the original communication link as the current communication link. By applying the embodiment of the invention, the link oscillation when the average values of the link quality of a plurality of links are the same or similar is effectively avoided, and the communication quality between the branch node and the central node is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a communication link.
Background
The networking shown in fig. 1 includes a branch node and a central node, wherein the branch node includes a client (e.g., client 100 and client 101) and a network device (e.g., guard wall device 102), and the central node includes a client (e.g., client 200 and client 201) and a network device (e.g., guard wall device 202).
In the branch center point scenario, one SP (Service Provider) provides one link, and the network device of the branch node accesses the network through multiple links, for example, through the SP of unicom, mobile, telecommunication, etc. When the branch node communicates with the central node, the network device of the branch node detects the link quality of each link (the link quality can be determined according to parameters such as packet loss quantity, delay and the like) in the order from high to low according to the priority of the preset link, each link is detected once as a cycle, the communication link is re-determined after the cycle is performed for a preset number of times, that is, for each link, calculating the link quality average value of the link according to the link quality obtained by detecting the preset times of the link, according to the link quality average value of each link, the link with the best link quality is determined as the communication link, namely the link with the best link quality is set to be in an activated state, the other links are determined to be non-communication links, that is, the other links are set to be in a deactivated state, and at this time, the link with the best link quality can be used for communication between the branch node and the central node.
In practical applications, the average values of the link qualities of multiple links detected by the network device of the branch node may be the same or similar, for example, the link qualities of the links are detected in an idle period, in this case, according to the above communication link determination method, a slight impact or a small traffic may cause re-determination of the communication link, which may easily cause oscillation of the link, and affect the communication quality between the branch node and the central node.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for determining a communication link, so as to avoid link oscillation when the mean values of link qualities of a plurality of links are the same or similar, and improve the communication quality between a branch node and a central node. The specific technical scheme is as follows:
in one aspect, an embodiment of the present invention discloses a method for determining a communication link, which is applied to a network device of a branch node, and the method includes:
circularly detecting the link quality of each branch node to the central node;
when the cyclic detection times reach preset times, respectively calculating the average value of the link quality of each detected link;
calculating the difference value of every two mean values;
and when the absolute value of each difference is less than or equal to the difference threshold, determining the original communication link as the current communication link.
In another aspect, an embodiment of the present invention discloses a communication link determining apparatus, which is applied to a network device of a branch node, and the apparatus includes:
the detection unit is used for circularly detecting the link quality of the link from each branch node to the central node;
the first calculating unit is used for respectively calculating the average value of the link quality of each detected link when the cyclic detection times reach the preset times;
the second calculating unit is used for calculating the difference value of every two mean values;
and the determining unit is used for determining the original communication link as the current communication link when the absolute value of each difference is less than or equal to the difference threshold.
In the embodiment of the invention, the link quality of a link from each branch node to a central node is circularly detected; when the cyclic detection times reach preset times, respectively calculating the average value of the link quality of each detected link; calculating the difference value of every two mean values; and when the absolute value of each difference value is less than or equal to the difference value threshold value, indicating that the average values of the link qualities of the plurality of links are the same or similar, refusing to determine the communication link again, and determining the original communication link as the current communication link. Therefore, link oscillation when the average values of the link qualities of a plurality of links are the same or similar is effectively avoided, and the communication quality between the branch node and the central node is improved. Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a networking;
fig. 2 is a schematic flow chart of a communication link determining method according to an embodiment of the present invention;
fig. 3 is another schematic flow chart of a communication link determining method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication link determining apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to avoid link oscillation when the average values of the link qualities of a plurality of links are possibly the same or similar and improve the communication quality between the branch node and the central node, the invention provides a method and a device for determining a signal link based on fig. 1. The present invention will be described in detail below with reference to specific examples.
Referring to fig. 2, fig. 2 is a schematic flowchart of a communication link determining method provided in an embodiment of the present invention, and the method is applied to a network device of a branch node, and the method includes:
s201: circularly detecting the link quality of each branch node to the central node;
here, the link quality is determined according to parameters such as the number of packet losses, delay, and the like. Based on this, the smaller the detected link quality value, e.g., the smaller the number of packet losses, the better the link quality.
In an embodiment of the present invention, the network device of the branch node presets a priority of each link, and the network device of the branch node detects the link quality of each link in an order from high priority to low priority, where each link is detected once as a cycle.
S202: when the cyclic detection times reach preset times, respectively calculating the average value of the link quality of each detected link;
when the cycle detection times reach the preset times, aiming at each link, the network equipment of the branch node detects the link quality of the preset times according to a formula
Respectively calculating to obtain the average value of the link quality of each link; wherein Q isiIs the average value of the link quality of the ith link, n is the preset times, and QjIs the j-th detected link quality of the ith link.
Here, the smaller the average value of the link quality, the better the link quality is.
S203: calculating the difference value of every two mean values;
s204: and when the absolute value of each difference is less than or equal to the difference threshold, determining the original communication link as the current communication link.
If the absolute value of each difference value is less than or equal to the difference value threshold value, the mean value of the link quality of each link is the same or similar, link switching is refused, namely, the communication link is refused to be determined again, the original communication link (namely the link in the original activated (active) state) is determined as the current communication link, and the state of the link in the original active state is kept unchanged; in addition, the non-communication link (i.e. the link in the original deactivated state) is determined as the current non-communication link, and the state of the link in the original inactive state is also kept unchanged, so that link oscillation when the average values of the link quality of a plurality of links are possibly the same or close is effectively avoided, and the communication quality between the branch node and the central node is improved.
In an embodiment of the present invention, in order to reduce the amount of computation, a quality threshold is stored in advance in the network device of the branch node, and after calculating an average of link qualities of each detected link, a state of a link whose average is greater than the quality threshold may be directly set to an inactive state; and calculating the difference value of the mean value of every two mass threshold values.
In this case, if the absolute value of each difference is less than or equal to the difference threshold and the mean value corresponding to the original communication link is less than or equal to the quality threshold, determining the original communication link as the current communication link, wherein the state of the link in the original active state is unchanged, and the states of other links are set as inactive states;
if the absolute value of each difference is less than or equal to the difference threshold value, but the average value corresponding to the original communication link is greater than the quality threshold value, selecting the link with the highest priority from the links corresponding to the average value less than or equal to the quality threshold value, determining the selected link as the current communication link, setting the state of the selected link as the active state, and setting the state of the links except the selected link as the inactive state.
In an embodiment of the present invention, if the absolute value of each difference is greater than the difference threshold, it indicates that the quality of the current link is relatively large, and the link with the best link quality is selected as the current communication link, that is, the link corresponding to the minimum mean is determined as the current communication link, the state of the link corresponding to the minimum mean is set as an active state, and the state of the link other than the link corresponding to the minimum mean is set as an inactive state.
In an embodiment of the present invention, if there are a difference value whose absolute value is greater than the difference threshold and a difference value whose absolute value is less than or equal to the difference threshold in the calculated difference values, a link with the highest priority is selected from all links corresponding to the difference value whose absolute value is less than or equal to the difference threshold as an alternative link; here, all links corresponding to a difference value having an absolute value less than or equal to the difference threshold include: the absolute value is less than or equal to the difference value threshold value, and the subtracted number corresponding to the difference value and the link corresponding to the subtracted number;
determining a link corresponding to the minimum mean value in the alternative link and the residual link as a current communication link, setting the state of the link corresponding to the minimum mean value in the alternative link and the residual link as an active state, and setting the state of links except the link corresponding to the minimum mean value in the alternative link and the residual link as an inactive state. Here, the remaining links include: links except for all links corresponding to the difference value with the absolute value less than or equal to the difference value threshold value.
In an embodiment of the present invention, in order to facilitate determining the current communication link, the remaining links include links whose average value is less than or equal to the quality threshold except for all links corresponding to differences whose absolute values are less than or equal to the difference threshold.
The above embodiments are generally described with reference to the flow chart of communication link determination shown in fig. 3, and the flow includes:
s01, circularly detecting the link quality of each branch node to the link of the central node;
s02, when the cycle detection times reach the preset times, respectively calculating the average value of the link quality of each detected link from each branch node to the central node;
s03, calculating the difference value of the mean values of every two mass threshold values which are less than or equal to the mass threshold value;
when the absolute value of each difference is less than or equal to the difference threshold, S04 is executed; when the absolute value of each difference is greater than the difference threshold, S07 is performed; when the absolute value of each difference is not greater than the difference threshold, S08 is performed;
s04, judging whether the average value corresponding to the original communication link is less than or equal to the quality threshold value; if so, go to S05; otherwise, go to S06;
s05, determining the original communication link as the current communication link;
specifically, the state of the link originally in the active state is not changed, and the states of the other links are set to the inactive state.
S06, determining the link with the highest priority in the links corresponding to the average value less than or equal to the quality threshold as the current communication link;
specifically, the state setting value of the link with the highest priority among the links corresponding to the average value less than or equal to the quality threshold is set to be active state, and the states of the other links are set to be inactive state.
S07, determining the link corresponding to the minimum mean value as the current communication link;
specifically, the state setting value of the link corresponding to the minimum average value is set to be active state, and the states of other links are set to be inactive state.
S08, selecting the link with the highest priority as the alternative link from all links corresponding to the difference value with the absolute value less than or equal to the difference value threshold;
and S09, determining the link corresponding to the minimum average value of the alternative link and the residual links as the current communication link.
Specifically, the state setting value of the link corresponding to the minimum average value of the candidate link and the remaining links is set to be an active state, and the states of the other links are set to be an inactive state.
Starting a silent timer after determining the current communication link; when the silence timer times out, S01 is re-executed.
The communication link determination method provided by the embodiment of the present invention is described in detail with reference to the network shown in fig. 1. In fig. 1, the guard wall device 102 of the branch node accesses the network through 3 links, which are SP1, SP2, and SP3, where the priorities of SP1, SP2, and SP3 are: SP1> SP2> SP 3; the communication link is SP2, and the state of SP2 is active state;
1. the protective wall equipment 102 circularly detects the link quality of 3 links of SP1, SP2 and SP 3;
2. when the number of cyclic detection times reaches a preset number, the protective wall device 102 calculates an average value of the link quality of the 3 links, for example, Q1、Q2And Q3；
Here, Q1、Q2And Q3Are all less than the quality threshold.
3. Guard wall device 102 calculates Q1、Q2And Q3The absolute value of the difference value of every two mean values is respectively as follows: q12＝|Q1-Q2|，Q13＝|Q1-Q3|，Q23＝|Q2-Q3|；
4. If Q12、Q13、Q23When the difference values are less than or equal to the difference value threshold value, the protective wall device 102 determines that the communication link is still SP2, the state of SP2 is set to be active state, and the states of SP1 and SP3 are set to be inactive state;
5. if Q12、Q13、Q23Are all greater than the difference threshold, the protective wall device 102 will then Q1、Q2And Q3The link corresponding to the smallest mean value of (A) is determined as the current communication link, e.g. Q1At a minimum, Q is determined1The corresponding SP1 is the current communication link, the state of the SP1 is set as an active state, and the states of the SP2 and the SP3 are set as an inactive state;
6. if Q12、Q13Greater than a difference threshold, Q23Less than or equal to the difference threshold, the guard wall device 102 follows Q23Selecting the highest priority from all the corresponding links SP2 and SP3High SP2 as an alternative link;
the link corresponding to the smallest mean value of the SP2 and the remaining links SP1 is determined as the current communication link, e.g., mean value Q corresponding to SP11And if the communication link is the current communication link, determining that the SP1 is the current communication link, and setting the state of the SP1 to be an active state and the states of the SP2 and the SP3 to be an inactive state.
It should be noted that the branch nodes communicate with the central node through an IPsec (Internet Protocol Security) tunnel, that is, a plurality of IPsec tunnels are established between the network devices of the branch nodes and the network devices of the central node, that is, the above-mentioned link is an IPsec link, and the above-mentioned determined communication link is an IPsec communication link.
By applying the embodiment, the link quality of the link from each branch node to the central node is circularly detected; when the cyclic detection times reach preset times, respectively calculating the average value of the link quality of each detected link; calculating the difference value of every two mean values; and when the absolute value of each difference value is less than or equal to the difference value threshold value, indicating that the average values of the link qualities of the plurality of links are the same or similar, refusing to determine the communication link again, and determining the original communication link as the current communication link. Therefore, link oscillation when the average values of the link qualities of a plurality of links are the same or similar is effectively avoided, and the communication quality between the branch node and the central node is improved.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a communication link determining apparatus according to an embodiment of the present invention, which is applied to a network device of a branch node, and the apparatus includes:
a detection unit 401, configured to cyclically detect link quality of a link from each branch node to the central node;
a first calculating unit 402, configured to calculate a mean value of link quality of each detected link when the number of times of loop detection reaches a preset number of times;
a second calculating unit 403, configured to calculate a difference between every two mean values;
a determining unit 404, configured to determine the original communication link as the current communication link when the absolute value of each difference is smaller than or equal to the difference threshold.
In an embodiment of the present invention, the determining unit 404 may further be configured to:
and when the absolute value of each difference value is greater than the difference value threshold value, determining the link corresponding to the minimum mean value as the current communication link.
In an embodiment of the present invention, the determining unit 404 may further be configured to:
when the absolute value of each difference is not larger than the difference threshold, selecting the link with the highest priority from all links corresponding to the difference with the absolute value smaller than or equal to the difference threshold as an alternative link;
determining a link corresponding to the minimum mean value in the alternative link and the residual links as a current communication link; the remaining links include links other than all links corresponding to differences having absolute values less than or equal to the difference threshold.
In an embodiment of the present invention, the second calculating unit 403 may specifically be configured to:
calculating the difference value of the mean values of every two mass threshold values which are less than or equal to the mass threshold value;
the determining unit 404 may specifically be configured to:
and when the absolute value of each difference is less than or equal to the difference threshold and the mean value corresponding to the original communication link is less than or equal to the quality threshold, determining the original communication link as the current communication link.
In an embodiment of the present invention, the determining unit 404 may further be configured to:
and when the absolute value of each difference is less than or equal to the difference threshold and the average value corresponding to the original communication link is greater than the quality threshold, determining the link with the highest priority in the links corresponding to the average value less than or equal to the quality threshold as the current communication link.
By applying the embodiment, the link quality of the link from each branch node to the central node is circularly detected; when the cyclic detection times reach preset times, respectively calculating the average value of the link quality of each detected link; calculating the difference value of every two mean values; and when the absolute value of each difference value is less than or equal to the difference value threshold value, indicating that the average values of the link qualities of the plurality of links are the same or similar, refusing to determine the communication link again, and determining the original communication link as the current communication link. Therefore, link oscillation when the average values of the link qualities of a plurality of links are the same or similar is effectively avoided, and the communication quality between the branch node and the central node is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A communication link determination method applied to a network device of a branch node, the method comprising:
circularly detecting the link quality of each branch node to the central node;
when the cyclic detection times reach preset times, respectively calculating the average value of the link quality of each detected link;
calculating the difference value of every two mean values;
when the absolute value of each difference is less than or equal to the difference threshold, determining the original communication link as the current communication link;
when the absolute value of each difference is not larger than the difference threshold, selecting the link with the highest priority from all links corresponding to the difference with the absolute value smaller than or equal to the difference threshold as an alternative link;
determining the link corresponding to the minimum mean value in the alternative link and the residual links as a current communication link; the remaining links include links other than all links corresponding to the difference having an absolute value less than or equal to the difference threshold.
2. The method of claim 1, further comprising:
and when the absolute value of each difference value is greater than the difference value threshold value, determining the link corresponding to the minimum mean value as the current communication link.
3. The method according to any one of claims 1-2, wherein the step of calculating the difference between each two mean values comprises:
calculating the difference value of the mean values of every two mass threshold values which are less than or equal to the mass threshold value;
when the absolute value of each difference is less than or equal to the difference threshold, the step of determining the original communication link as the current communication link comprises the following steps:
and when the absolute value of each difference is less than or equal to the difference threshold and the average value corresponding to the original communication link is less than or equal to the quality threshold, determining the original communication link as the current communication link.
4. The method of claim 3, further comprising:
and when the absolute value of each difference is less than or equal to the difference threshold and the average value corresponding to the original communication link is greater than the quality threshold, determining the link with the highest priority in the links corresponding to the average value less than or equal to the quality threshold as the current communication link.
5. A communication link determination apparatus applied to a network device of a branch node, the apparatus comprising:
the detection unit is used for circularly detecting the link quality of the link from each branch node to the central node;
the first calculating unit is used for respectively calculating the average value of the link quality of each detected link when the cyclic detection times reach the preset times;
the second calculating unit is used for calculating the difference value of every two mean values;
the determining unit is used for determining the original communication link as the current communication link when the absolute value of each difference value is less than or equal to the difference value threshold;
the determining unit is further configured to:
when the absolute value of each difference is not larger than the difference threshold, selecting the link with the highest priority from all links corresponding to the difference with the absolute value smaller than or equal to the difference threshold as an alternative link;
determining the link corresponding to the minimum mean value in the alternative link and the residual links as a current communication link; the remaining links include links other than all links corresponding to the difference having an absolute value less than or equal to the difference threshold.
6. The apparatus of claim 5, wherein the determining unit is further configured to:
and when the absolute value of each difference value is greater than the difference value threshold value, determining the link corresponding to the minimum mean value as the current communication link.
7. The apparatus according to any one of claims 5 to 6,
the second calculating unit is specifically configured to calculate a difference between two mean values smaller than or equal to the mass threshold;
the determining unit is specifically configured to determine the original communication link as the current communication link when the absolute value of each difference is less than or equal to the difference threshold and the mean value corresponding to the original communication link is less than or equal to the quality threshold.
8. The apparatus of claim 7, wherein the determining unit is further configured to:
and when the absolute value of each difference is less than or equal to the difference threshold and the average value corresponding to the original communication link is greater than the quality threshold, determining the link with the highest priority in the links corresponding to the average value less than or equal to the quality threshold as the current communication link.
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