CN117279057A

CN117279057A - Link switching method and device

Info

Publication number: CN117279057A
Application number: CN202311056756.3A
Authority: CN
Inventors: 黄翔; 单丽娜
Original assignee: New H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2023-08-18
Filing date: 2023-08-18
Publication date: 2023-12-22

Abstract

The application provides a link switching method and device, and relates to the technical field of wireless. The method is applied to the AP, and comprises the following steps: performing event monitoring on a physical port corresponding to a main link between the AP and a main AC; when the physical port is monitored to generate a setting event, a main link disconnection message is sent to a standby AC so as to instruct the standby AC to switch the link of the standby AC to a main link; receiving a link switching message sent by the standby AC; and switching the standby link on the AP into the active link. Therefore, by detecting the physical port, the fault in the link can be detected in time, and further the quick switching of the link is realized.

Description

Link switching method and device

Technical Field

The present disclosure relates to the field of wireless technologies, and in particular, to a link switching method and device.

Background

An AP (Access Point) dual-link backup technology is a high-reliability networking scheme in a wireless network. By deploying the main and standby stations AC Access Controller and accessing the controller), the functions of double-link backup, fault transfer, service back-off and the like based on the AP are realized, and the network risk caused by single AC fault is reduced.

In practical application, when the primary link fails to keep alive due to failure of the primary AC or local network, the AP immediately senses that the primary link is disconnected, and then triggers link switching. The link switching process is approximately as follows: the AP actively informs the standby AC of the message of the main link disconnection, and after the standby AC receives the message, the standby AC switches the link state of the standby AC from standby to active. At this time, the backup AC is upgraded to the primary AC, and the AP is notified to perform link switching. After receiving the link switching message, the AP switches the standby link to the main link to instruct the wireless service of the AP to be taken over by the new main AC. If the current primary AC configures the IP address of the backup AC, the AP begins probing the backup AC, attempting to establish a new backup link.

In the above AP dual-link backup technology, a state machine that relies on a protocol is required to detect a network failure, for example, a state machine that uses CAPWAP to perform failure detection, where the state machine has a certain retry mechanism, and the maximum time is from several seconds to tens of seconds. However, for explicit network failure detection, when the state machine is used for detection, the response time of the state machine is relatively long, and the link switching speed is affected.

Disclosure of Invention

In view of this, the present application provides a method and apparatus for link switching, which are used to detect a link failure in time and perform link switching.

Specifically, the application is realized by the following technical scheme:

according to a first aspect of the present application, there is provided a link switching method, applied to an AP, the method including:

performing event monitoring on a physical port corresponding to a main link between the AP and a main AC;

when the physical port is monitored to generate a setting event, a main link disconnection message is sent to a standby AC so as to instruct the standby AC to switch the link of the standby AC into a main link;

receiving a link switching message sent by the standby AC;

and switching the standby link on the AP into the active link.

Optionally, when the physical port is monitored to generate a setting event, sending a main link disconnection message to the standby AC, including:

and when the physical port is monitored to generate a down event, sending a main link disconnection message to the standby AC.

Optionally, the physical port is at least one of: RJ-45 interface, optical fiber interface.

Optionally, the method for monitoring the physical port to generate the setting event comprises the following steps:

if the physical port is an RJ-45 interface, confirming that a setting event occurs to the physical port when the PHY chip is monitored to generate a down signal;

if the physical port is an optical fiber interface, when the insufficient optical power of the optical fiber interface is monitored or the optical fiber of the optical fiber interface is pulled out, confirming that a setting event occurs in the physical port.

Optionally, sending the primary link disconnection message to the backup AC includes:

and if the IP address of the standby AC is configured on the main AC, sending a main link disconnection message to the standby AC indicated by the IP address.

According to a second aspect of the present application, there is provided a link switching apparatus, provided in an AP, the apparatus including:

the monitoring module is used for carrying out event monitoring on a physical port corresponding to a main link between the AP and the main AC;

the sending module is used for sending a main link disconnection message to the standby AC when the monitoring module monitors that the physical port has a set event so as to instruct the standby AC to switch the link of the standby AC to the main link;

the receiving module is used for receiving the link switching message sent by the standby AC;

and the switching module is used for switching the standby link on the AP into the main link.

Optionally, the sending module is specifically configured to send a primary link disconnection message to the backup AC when the monitoring module monitors that the physical port has a down event.

Optionally, the monitoring module is specifically configured to, if the physical port is an RJ-45 interface, confirm that a setting event occurs on the physical port when it is monitored that the PHY chip generates a down signal; if the physical port is an optical fiber interface, when the insufficient optical power of the optical fiber interface is monitored or the optical fiber of the optical fiber interface is pulled out, confirming that a setting event occurs in the physical port.

Optionally, the sending module is specifically configured to send a primary link disconnection message to the backup AC indicated by the IP address if the IP address of the backup AC is configured on the primary AC.

According to a third aspect of the present application there is provided an AP comprising a processor and a machine-readable storage medium storing a computer program executable by the processor, the processor being caused by the computer program to perform the method provided by the first aspect of the embodiments of the present application.

According to a fourth aspect of the present application there is provided a machine-readable storage medium storing a computer program which, when invoked and executed by a processor, causes the processor to perform the method provided by the first aspect of the embodiments of the present application.

The beneficial effects of the embodiment of the application are that:

in the link switching method and device provided by the embodiment of the application, event monitoring is performed on a physical port on the AP corresponding to a main link between main ACs; when the physical port is monitored to generate a setting event, a main link disconnection message is sent to a standby AC so as to instruct the standby AC to switch the link of the standby AC to a main link; receiving a link switching message sent by the standby AC; and switching the standby link on the AP into the active link. Therefore, by carrying out event monitoring on the physical port, the fault in the link can be timely and accurately detected, the quick switching of the main link and the standby link is further realized, the monitoring result of a state machine is not needed, and the problem of low link switching speed caused by long monitoring response time of the state machine is solved.

Drawings

Fig. 1 is a flow chart of a link switching method provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a link switching device according to an embodiment of the present application;

fig. 3 is a schematic hardware structure of an electronic device for implementing a link switching method according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with aspects as described herein.

The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the corresponding listed items.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first message may also be referred to as a second message, and similarly, a second message may also be referred to as a first message, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.

The link switching method provided in the present application is described in detail below.

Referring to fig. 1, fig. 1 is a flowchart of a link switching method provided in the present application, where the method may be applied to an AP, and when the AP implements the method, the method may include the following steps:

s101, carrying out event monitoring on a physical port corresponding to a main link between the AP and the main AC.

In this step, in order to timely monitor whether the primary link fails, the embodiment proposes that the AP performs event monitoring on a physical port corresponding to the primary link between the AP and the AC, that is, performs event monitoring on a physical port where a service packet transmitted by the primary link enters the AP and an output port (physical port) where the AP sends the service packet to the AC.

Specifically, the AP may be provided with a CAPWAP module, and then the CAPWAP module performs monitoring whether an event occurs at the physical port.

And S102, when the physical port is monitored to generate a setting event, sending a main link disconnection message to a standby AC (access control) to instruct the standby AC to switch the link of the standby AC to the main link.

In this step, the setting event may be an event for indicating that the active link corresponding to the physical port cannot pass through the communication service. Therefore, after the physical port is monitored to generate the setting event, the current main link cannot provide communication transmission service subsequently, so that the main-standby switching flow can be started at this time, namely, a main link disconnection message is sent to the standby AC to instruct the standby AC to switch the link of the standby AC to the main link, and the monitoring result of a state machine is not required to be equal any more, thereby improving the switching speed of the main-standby link.

Optionally, the events that can occur by the physical ports may be, but are not limited to, up events, down events, etc., where up events are used to indicate that the current physical port is online and has no fault, and up events are used to indicate that the current physical port has fault, and no service can be provided. Therefore, the above-described setting event may be set as a down event, and thus, step S102 may be performed according to the following procedure: and when the physical port is monitored to generate a down event, sending a main link disconnection message to the standby AC.

Specifically, when a down event occurs on the physical port, it indicates that the physical port corresponding to the active link cannot provide a communication service, that is, a service packet between the AP and the AC cannot be normally transmitted from the active link, so that switching between the active link and the standby link is required at this time, that is, at this time, a switching flow of the active link and the standby link can be directly triggered without waiting for a monitoring result of the state machine. The AP may send the above-mentioned primary link disconnection message to the backup AC, so after the backup AC receives the disconnection message, it may know that the primary link cannot currently provide service, and it is necessary to switch the backup link between itself and the AP to the primary link, and at the same time, the backup AC is promoted to the primary AC, thereby implementing timely switching of the link, and further implementing normal transmission of the subsequent message.

S103, receiving the link switching message sent by the standby AC.

In this step, after the standby AC promotes the link between itself and the AP to be the active link according to the active link disconnection message, a link switching message is sent to the AP, which indicates that itself has been switched to the active AC on the one hand, and informs the AP to switch the standby link between itself and the standby AC to be the active link on the other hand.

S104, switching the standby link on the AP into the active link.

In this step, after receiving the above link switching message, the AP may switch the standby link between the AP and the standby AC to the active link, and may start to provide the transmission service for interaction between the AP and the AC. Therefore, after the physical port is monitored to generate the setting event, the main and standby switching flow can be started, so that the link switching can be performed in time when the network cable fails, and the condition that the link switching speed is influenced due to the monitoring result of the waiting state machine is avoided.

By implementing the link switching method provided by the application, the physical ports corresponding to the main links between the APs and the main ACs are subjected to event monitoring; when the physical port is monitored to generate a setting event, a main link disconnection message is sent to a standby AC so as to instruct the standby AC to switch the link of the standby AC to a main link; receiving a link switching message sent by the standby AC; and switching the standby link on the AP into the active link. Therefore, by carrying out event monitoring on the physical port, the fault in the link can be timely and accurately detected, the quick switching of the main link and the standby link is further realized, the monitoring result of a state machine is not needed, and the problem of low link switching speed caused by long monitoring response time of the state machine is solved.

Alternatively, based on any one of the above embodiments, in this embodiment, the physical port may be at least one of the following, but not limited to: an RJ-45 interface, a fiber optic interface, etc.

On the basis, the method for monitoring the physical port to generate the setting event can be as follows: if the physical port is an RJ-45 interface, confirming that the physical port generates a setting event when the PHY chip generates a down signal; if the physical port is an optical fiber interface, when it is detected that the optical power of the optical fiber interface is insufficient or the optical fiber of the optical fiber interface is pulled out, it is confirmed that a setting event occurs in the physical port.

Specifically, the PHY chip belongs to a physical layer chip, and in an AP, the PHY chip is generally configured to implement a physical layer interface, so in this embodiment, the PHY chip is used to monitor the RJ-45 interface, and when it is monitored that the RJ-45 interface fails or a network cable is pulled out, it indicates that the RJ-45 interface cannot continue to provide communication services for a primary link, so the PHY chip may send a down signal to a CAPWAP module, and in this way, after the CAPWAP module receives the down signal, it may be confirmed that the setting event occurs in the physical port.

When the physical port is an optical fiber interface, whether the optical fiber interface has a down event or not can be confirmed by monitoring the interface condition of the optical fiber interface corresponding to the main link, specifically, the optical power of the optical fiber interface can be monitored, and/or whether the optical fiber in the optical fiber interface is pulled out or not can be monitored. When the optical power of the optical fiber interface is monitored to be insufficient, for example, the optical power is lower than a set power threshold, it indicates that the optical fiber interface cannot provide communication service under the optical power, or even if the optical fiber interface can provide communication service, there may be a situation that a signal is unstable and even a packet is lost, so in order to ensure normal communication between the AP and the AC, it may be considered that a down event is monitored, that is, the above-mentioned primary-backup link switching procedure is triggered. When the optical fiber interface is monitored to be pulled out, the fact that the main link corresponding to the optical fiber interface cannot continue to provide communication service can be directly determined, so that the fact that the physical port is monitored to generate the setting event can be directly confirmed, and the main link and standby link switching flow can be directly started.

Alternatively, based on any of the above embodiments, in this embodiment, the step of sending the active link disconnection message to the backup AC in S102 may be performed according to the following procedure: and if the IP address of the standby AC is configured on the main AC, sending a main link disconnection message to the standby AC indicated by the IP address.

In practical application, the corresponding backup AC may be set in the primary AC, that is, the backup AC designated by the primary AC may exist, and based on the scenario, when the AP monitors that the physical port has the set event, the AP needs to determine the backup AC of the primary AC at this time because the AP starts the primary-backup link switching flow, so when it is confirmed that the IP address of the backup AC is configured on the primary AC, the AP may send the primary link disconnection message to the backup AC corresponding to the IP address at this time.

If the IP address of the backup AC is not configured on the primary AC, at this time, the AP may send a primary link disconnection message to the backup AC corresponding to the IP address according to the locally configured IP address of the backup AC, so as to execute switching between the primary link and the backup link.

Notably, the above-described AP may be, but is not limited to, a FIT AP or the like.

Therefore, when the physical port used by the main link between the AP and the AC fails, the service switching can be effectively performed faster without waiting for the reaction of the state machine, thereby improving the switching speed of the main link and the standby link.

Based on the same inventive concept, the application also provides a link switching device corresponding to the link switching method. The implementation of the link switching device may refer specifically to the above description of the link switching method, and will not be discussed here.

Referring to fig. 2, fig. 2 is a link switching apparatus provided in an exemplary embodiment of the present application, which is disposed in an AP, and includes:

a monitoring module 201, configured to monitor an event on a physical port on the AP corresponding to a primary link between the primary ACs;

a sending module 202, configured to send a primary link disconnection message to a backup AC when the monitoring module monitors that a setting event occurs on the physical port, so as to instruct the backup AC to switch its own link to a primary link;

a receiving module 203, configured to receive a link switching message sent by the backup AC;

and a switching module 204, configured to switch the standby link on the AP to the active link.

Therefore, by carrying out event monitoring on the physical port, the fault in the link can be timely and accurately detected, the quick switching of the main link and the standby link is further realized, the monitoring result of a state machine is not needed, and the problem of low link switching speed caused by long monitoring response time of the state machine is solved.

Optionally, based on the foregoing embodiment, in this embodiment, the sending module 202 is specifically configured to send a primary link disconnection message to the backup AC when the monitoring module monitors that a down event occurs on the physical port.

Optionally, based on any one of the foregoing embodiments, in this embodiment, the monitoring module 201 is specifically configured to, if the physical port is an RJ-45 interface, confirm that a setting event occurs on the physical port when it is detected that the PHY chip generates a down signal; if the physical port is an optical fiber interface, when the insufficient optical power of the optical fiber interface is monitored or the optical fiber of the optical fiber interface is pulled out, confirming that a setting event occurs in the physical port.

Optionally, based on any one of the foregoing embodiments, in this embodiment, the sending module 202 is specifically configured to send a primary link disconnection message to the backup AC indicated by the IP address if the IP address of the backup AC is configured on the primary AC.

Based on the same inventive concept, the embodiments of the present application provide an AP, as shown in fig. 3, which may include a processor 301 and a machine-readable storage medium 302, where the machine-readable storage medium 302 stores a computer program capable of being executed by the processor 301, and the processor 301 is caused by the computer program to perform the link switching method provided in any of the embodiments of the present application. The AP further comprises a communication interface 303 and a communication bus 304, wherein the processor 301, the communication interface 303, and the machine readable storage medium 302 perform communication with each other via the communication bus 304.

The communication bus mentioned by the above AP may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, or the like. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.

The communication interface is used for communication between the AP and other devices.

The machine-readable storage medium 302 may be a Memory, which may include random access Memory (Random Access Memory, RAM), DDR SRAM (Double Data Rate Synchronous Dynamic Random Access Memory, double rate synchronous dynamic random access Memory), or Non-Volatile Memory (NVM), such as at least one magnetic disk Memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.

The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

For the AP and machine-readable storage medium embodiments, the description is relatively simple, as the method content involved is substantially similar to the method embodiments described above, and reference will only be made to part of the description of the method embodiments.

It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The implementation process of the functions and roles of each unit/module in the above device is specifically shown in the implementation process of the corresponding steps in the above method, and will not be repeated here.

For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The above described apparatus embodiments are merely illustrative, wherein the units/modules illustrated as separate components may or may not be physically separate, and the components shown as units/modules may or may not be physical units/modules, i.e. may be located in one place, or may be distributed over a plurality of network units/modules. Some or all of the units/modules may be selected according to actual needs to achieve the purposes of the present application. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A link switching method, which is applied to an AP, comprising:

receiving a link switching message sent by the standby AC;

and switching the standby link on the AP into the active link.

2. The method of claim 1, wherein sending a primary link disconnect message to a backup AC when a setup event is detected for the physical port, comprises:

3. The method of claim 1, wherein the physical port is at least one of: RJ-45 interface, optical fiber interface.

4. A method according to claim 3, wherein the method for monitoring the physical port for a setup event comprises:

5. The method of claim 1, wherein sending the active link down message to the backup AC comprises:

6. A link switching apparatus, disposed in an AP, comprising:

7. The apparatus of claim 6, wherein the device comprises a plurality of sensors,

the sending module is specifically configured to send a primary link disconnection message to a standby AC when the monitoring module monitors that a down event occurs on the physical port.

8. The apparatus of claim 6, wherein the device comprises a plurality of sensors,

the monitoring module is specifically configured to, if the physical port is an RJ-45 interface, confirm that a setting event occurs in the physical port when it is monitored that the PHY chip generates a down signal; if the physical port is an optical fiber interface, when the insufficient optical power of the optical fiber interface is monitored or the optical fiber of the optical fiber interface is pulled out, confirming that a setting event occurs in the physical port.

9. The apparatus of claim 6, wherein the device comprises a plurality of sensors,

the sending module is specifically configured to send a primary link disconnection message to the backup AC indicated by the IP address if the IP address of the backup AC is configured on the primary AC.

10. An AP comprising a processor and a machine-readable storage medium storing a computer program executable by the processor, the processor being caused by the computer program to perform the method of any one of claims 1-5.

11. A machine-readable storage medium storing a computer program which, when invoked and executed by a processor, causes the processor to perform the method of any one of claims 1-5.