WO2021169276A1 - Link detection method and apparatus, computer device, and storage medium - Google Patents

Abstract

The present application relates to the technical field of computers. Disclosed are a link detection method and apparatus, a computer device, and a storage medium. The method comprises: selecting M virtual local area network sub-interfaces from K virtual local area network sub-interfaces of a specific physical network interface according to a preset selection approach, establishing a detection protocol session in a virtual routing forwarding instance of the selected M virtual local area network sub-interfaces, using a virtual routing forwarding instance in which the detection protocol session is established as a detection virtual routing forwarding instance, and using a virtual routing forwarding instance of the unselected (K-M) virtual local area network sub-interfaces as a subscription virtual routing forwarding instance; obtaining link state information detected by the detection virtual routing forwarding instance; and instructing the subscription virtual routing forwarding instance to perform routing change processing according to the link state information. The technical solution of the present application can reduce the occupation of device resources of a network device such as a CPU and a memory, thereby improving the performance of the network device and the network transmission performance.

Description

Link detection method, device, computer equipment and storage medium

This application is based on the Chinese invention application with the application number 202010122314.4 and titled "Link Detection Method, Device, Computer Equipment and Storage Medium" filed on February 27, 2020, and claims the right of priority.

Technical field

This application relates to the field of computer technology, and in particular to a link detection method, device, computer equipment, and storage medium.

Background technique

With the development of network communication technology, in order to ensure the quality and speed of data transmission, the requirements for network equipment are getting higher and higher. If a network link fails, it is necessary to detect the point of failure as soon as possible so that timely measures can be taken, requiring network equipment to quickly detect the failure and switch traffic to the backup link to speed up network convergence. The detection of link failure is generally through the BFD (Bidirectional Forwarding Detection, bidirectional forwarding detection) protocol as a fast detection mechanism.

Create a BFD session on each VRF (Virtual Routing Forwarding) instance. Both parties of the BFD session periodically send BFD control packets to each other on the link, and also periodically check the BFD control sent by the other party on the link. The message is used for fault detection based on whether the control message from the other party is received under certain conditions. Based on the IEEE 802.1q standard specification, in routers or Layer 3 switches that support multiple VRFs, the same physical network interface can support up to 4096 VLANs (Virtual Local Area Network, virtual local area network) sub-interface, so 4096 VRF instances can be established. In order to achieve rapid route convergence in each VRF instance, a BFD session is opened to confirm the connectivity to the next hop. Assuming that the detection time of each BFD session is configured as 100 milliseconds, one data packet will be sent and received every 100 milliseconds. For 4096 BFD sessions, 40960 BFD data packets need to be sent and received per second. The inventor realized that if the detection time is configured to be shorter, more data packets need to be sent and received per second. This adds excessive overhead to the CPU (Central Processing Unit), memory, and network of a network device with limited resources.

Summary of the invention

The embodiments of the present application provide a link detection method, device, computer equipment, and storage medium to solve the occupation of network equipment resources and network transmission resources due to link failure detection in a link communication network, which leads to network equipment performance and network performance. The problem of degraded transmission performance.

A link detection method includes:

From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, and establish detection in the virtual routing and forwarding instances of the selected M virtual local area network sub-interfaces Protocol session, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM sub-interfaces of the virtual local area network that are not selected are used as subscription virtual routing and forwarding Examples, where K and M are both positive integers, and M<K;

Acquiring link state information detected by the detected virtual routing and forwarding instance;

Forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.

A link detection device includes:

The instance object selection module is used to select M virtual local area network sub-interfaces from the K virtual local area network sub-interfaces of a specific physical network interface according to a preset selection method, and select M virtual local area network sub-interfaces in the selected M virtual local area network sub-interfaces. A detection protocol session is established in a virtual routing and forwarding instance, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routes of the KM sub-interfaces of the virtual local area network that have not been selected The forwarding instance is used as a subscription virtual routing forwarding instance, where K and M are both positive integers, and M<K;

An information acquisition module, configured to acquire link state information detected by the virtual routing and forwarding detection instance;

The information processing module is configured to forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.

A computer device includes a memory, a processor, and computer-readable instructions that are stored in the memory and can run on the processor, wherein the processor implements the following steps when the processor executes the computer-readable instructions:

From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, and establish detection in the virtual routing and forwarding instances of the selected M virtual local area network sub-interfaces Protocol session, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM sub-interfaces of the virtual local area network that are not selected are used as subscription virtual routing and forwarding Examples, where K and M are both positive integers, and M<K;

Acquiring link state information detected by the detected virtual routing and forwarding instance;

Forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.

One or more readable storage media storing computer readable instructions. The computer readable storage medium stores computer readable instructions. When the computer readable instructions are executed by one or more processors, the The one or more processors execute the following steps:

From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, and establish detection in the virtual routing and forwarding instances of the selected M virtual local area network sub-interfaces Protocol session, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM sub-interfaces of the virtual local area network that are not selected are used as subscription virtual routing and forwarding Examples, where K and M are both positive integers, and M<K;

Acquiring link state information detected by the detected virtual routing and forwarding instance;

Forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.

In the above-mentioned link detection method, device, computer equipment and storage medium, the specific virtual local area network sub-interface is selected in a preset manner from the virtual local area network sub-interface of the specific physical network interface as the detection virtual route forwarding instance, and the detection The detection protocol session is established in the virtual routing and forwarding instance to detect the link state information, and the unselected virtual local area network sub-interface is used as the subscribed virtual routing and forwarding instance, and the link state information is obtained by subscribing. It is not necessary to establish in each virtual local area network sub-interface Detecting protocol sessions to detect link state information can further reduce the occupation of network equipment's CPU and memory and other equipment resources, as well as reduce the occupation of network transmission resources, improve the forwarding and response capabilities of network equipment, and thus improve network equipment Performance and network transmission performance.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

FIG. 1 is a flowchart of a link detection method in an embodiment of the present application;

2 is a flowchart of step S2 in the link detection method in an embodiment of the present application;

FIG. 3 is a flowchart of step S5 in the link detection method in an embodiment of the present application;

Figure 4 is a schematic diagram of a link detection device in an embodiment of the present application;

Fig. 5 is a schematic diagram of a computer device in an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The link detection method provided in this application can be applied to network equipment, where the network equipment can specifically be various computers, hubs, switches, bridges, routers, gateways, network interface cards, wireless access points, printers, and modems. , And portable wearable devices, etc. The network device selects the detection virtual routing and forwarding instance and subscribing to the virtual routing and forwarding instance according to a preset method, obtains the link state information detected by the detection virtual routing and forwarding instance, and instructs the subscribed virtual routing and forwarding instance to make routing changes based on the link state information deal with.

In an embodiment, as shown in FIG. 1, a link detection method is provided. The method is applied to a network device as an example for description, which specifically includes steps S1 to S3, which are described in detail as follows:

S1 : From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, and establish a detection protocol session in the virtual routing and forwarding instance of the selected M virtual local area network sub-interfaces, The virtual routing and forwarding instance that has established the detection protocol session is used as the detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the unselected KM virtual local area network sub-interfaces are used as the subscription virtual routing and forwarding instances, where K and M are both positive integers , M<K.

Specifically, based on the IEEE 802.1q standard specification, one physical network interface of a network device can support a maximum of 4096 virtual local area network sub-interfaces, so a maximum of 4096 virtual routing and forwarding instances can be established. Among them, a virtual routing and forwarding instance is a VRF instance, which is specifically a virtual router in a virtual local area network sub-interface. The virtual router includes: an independent routing table, an independent address space, a collection of network interfaces belonging to the virtual router, and a group The routing protocol used only for this virtual router. The network devices communicate with each other by accessing the routing table stored in the address space of the virtual routing and forwarding instance through the routing protocol of the virtual routing and forwarding instance.

From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, where K is less than or equal to the maximum number of virtual local area network sub-interfaces 4096, M is less than K, and both K and M Is a positive integer. Among them, the preset selection method may be a random selection method.

Establish a detection protocol session in the virtual routing and forwarding instance in each selected virtual local area network sub-interface. Among them, the detection protocol session is a BFD session, which is a communication session established by the link detection protocol in the process of detecting link state information.

Specifically, in this embodiment, the link detection protocol for establishing a detection protocol session is specifically a two-way forwarding detection protocol, that is, the BFD protocol, which can establish contact with links, interfaces, tunnels, routes, or other network forwarding components. Intermediate system protocol: The two-way forwarding detection protocol can establish a peer relationship with neighboring systems. Each system monitors the two-way forwarding detection protocol rate from other systems at a negotiated rate, and the monitoring rate can be set in millisecond increments. When the peer-to-peer system does not receive a preset number of data packets, it infers that the software or hardware infrastructure protected by the two-way forwarding detection protocol is faulty, regardless of whether the infrastructure is a label switching path, other types of tunnels, or a switched Ethernet network. The two-way forwarding detection protocol is deployed on the control plane of routers and other systems. The network failure detected by the two-way forwarding detection protocol can be recovered by the forwarding plane or the control plane.

It should be noted that the network device uses the virtual routing and forwarding protocol that has established a two-way forwarding detection protocol session as the detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM virtual local area network sub-interfaces that are not selected are used as the subscription virtual routing and forwarding instances, thereby There is no need to establish a two-way forwarding detection protocol session on each virtual routing and forwarding instance to detect link state information. It is only necessary to detect the link status by detecting the virtual routing and forwarding instance, and subscribe to the virtual routing and forwarding instance through subscription. Obtain link status information to reduce the occupation of network equipment's CPU and memory and other equipment resources, as well as reduce the occupation of network transmission resources, thereby improving the forwarding and responsiveness of network equipment, and improving network equipment performance and network transmission performance.

S2 : Obtain the link state information detected by the virtual routing and forwarding instance.

Specifically, the link state is detected by detecting the two-way forwarding detection protocol session established in the virtual routing and forwarding instance, and the link state information is obtained through the gateway address of the target link in the two-way forwarding detection protocol session.

Specifically, the main working process of the two-way forwarding detection protocol to establish a two-way forwarding detection protocol session is as follows:

1. Use the two-way forwarding detection protocol to first establish a two-way forwarding detection protocol session on a link between two endpoints, relying on the upper layer protocol to establish, for example, when a neighbor with open shortest path first is established, the neighbor information will be notified to the two-way forwarding detection protocol. The two-way forwarding detection protocol establishes a two-way forwarding detection protocol session neighbor based on this information. If there are multiple links between the two endpoints, a two-way forwarding detection protocol session can be established for each link. Among them, the open shortest path is preferred as an internal gateway protocol, which is used to make routing decisions in a single autonomous system. It is an implementation of the link state routing protocol and belongs to the interior gateway protocol.

2. The two-way forwarding detection protocol session performs two-way forwarding detection protocol session detection between two network nodes that establish the session. If a link failure is found, the two-way forwarding detection protocol session neighbor is removed, and the upper layer protocol is notified immediately, and the upper layer protocol will immediately switch accordingly.

When a two-way forwarding detection protocol session is established, there are two establishment modes: active mode and passive mode.

Active mode: Before establishing a two-way forwarding detection protocol session, regardless of whether it receives a two-way forwarding detection protocol control message from the target link gateway address end, it will actively send a two-way forwarding detection protocol control message to the target link gateway address end.

Passive mode: The two-way detection protocol control message will not be actively sent before the dialogue is established, until the two-way forwarding detection protocol control message sent from the target link gateway address is received.

In the session initialization process, at least one of the communicating parties must be running in active mode to successfully establish a session.

The two-way forwarding detection protocol has two operating modes after the session is established: asynchronous mode and query mode.

Asynchronous mode: In this mode, both link network nodes will periodically send two-way forwarding detection protocol control messages. If they do not receive the two-way forwarding detection protocol control message from the target link gateway address within the detection time, it will be considered corresponding The link network node fails.

Query mode: Assume that each system has an independent method to confirm that it is connected to other systems. In this way, as long as a two-way forwarding detection protocol session is established, the system stops sending two-way forwarding detection protocol control messages, unless a certain system needs to explicitly verify connectivity. If you want to explicitly verify the connectivity, the system sends a short series of two-way forwarding detection protocol control packets. If the return message is not received within the detection time, the session status is declared as Down; if the target link gateway address end is received In response to the message, the protocol remained silent again. Among them, the session state Down is the message state during the two-way forwarding detection protocol session, and the two-way forwarding detection protocol session message state includes: 0—AdminDown; 1—Down; 2—Init; 3—Up.

There is also an echo function in the two-way forwarding detection protocol session. After the echo function is activated, one end of the session periodically sends two-way detection protocol echo messages, and the target link gateway address does not process the echo messages, but only this The message is forwarded and then sent back to the sender. The sender detects the session state according to whether it can receive the two-way detection protocol message. The two-way forwarding detection protocol echo message is only used to detect the link status information of the directly connected network segment, and the two-way forwarding detection protocol control message can also detect the link status information of the non-directly connected network segment.

Further, the obtained link state information may be a link failure or an unblocked link.

It should be noted that the two-way forwarding detection protocol used in this embodiment provides a universal and standardized media-independent and protocol-independent protocol, which can detect link failures on any type of two-way forwarding path between network devices, which can be Different upper-layer application services provide consistent fast fault detection time, microsecond link detection accuracy, reduce application interruption time, and improve network reliability.

S3 : Forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing based on the link state information.

Specifically, after the network device obtains the link state information detected by the virtual routing and forwarding instance, the virtual routing and forwarding instance that is not selected as the subscribing virtual routing and forwarding instance performs processing according to the link state information detected by the virtual routing and forwarding instance. Routing change processing.

Store the detected link state information in a preset database, and notify the subscribed virtual routing and forwarding instance that pays attention to the link state information through the subscription mechanism. Among them, the subscription mechanism is that when an event occurs, the party that detects or generates the event acts as the active party to notify the subscriber as the passive party through the notification function. The notification function is a notification linked list in which one party is the notifier and the other party is the receiver. The linked list can be a function linked list.

The subscribed virtual route forwarding instance performs different route change processing according to different link state information. Among them, the link state information may include: link failure and link unblocking. When the link state information indicates that the link is down, route convergence is performed; when the link state information indicates that the link is unblocked, the route is restored.

It should be noted that in this embodiment, there are two ways to forward the link state information to the subscribed virtual route forwarding instance: one is to directly obtain the link state information through the subscription mechanism; the other is, By storing the detected link state information in a preset database, the link state information is obtained from the preset database. When one method fails, the other method can be used as a backup method. The two methods can exist simultaneously in the process of link detection in the active and standby mode, which can improve the efficiency of link state information forwarding and improve the network equipment. Forwarding ability and response ability, thereby improving network equipment performance and network transmission performance.

In this embodiment, the network device first divides the virtual routing and forwarding instances in the virtual local area network sub-interfaces into detection virtual routing and forwarding instances and subscribing to virtual routing and forwarding instances in a preset manner, and establishes a two-way forwarding detection protocol in the virtual routing and forwarding detection instances. Session, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the obtained link state information. The virtual routing and forwarding instances in the virtual local area network sub-interfaces are divided into detection virtual routing and forwarding instances and subscribing to virtual routing and forwarding instances in a preset manner. Only two-way detection protocol sessions are established in the detection virtual routing and forwarding instances, without the need for each Establishing a two-way forwarding detection protocol session in the virtual routing and forwarding instance to detect link state information can further reduce the occupation of device resources such as CPU and memory of network equipment, reduce the occupation of network transmission resources, and improve the forwarding ability of network equipment. Responsiveness, thereby improving network equipment performance and network transmission performance.

In an embodiment, as shown in FIG. 2, in step S2, obtaining the link state information detected by the detection virtual routing and forwarding instance specifically includes steps S21 to S22, which are described in detail as follows:

S21 : Instruct the detection virtual route forwarding instance to send a detection protocol control message to the target link gateway address and receive a response message from the target link gateway address.

Specifically, the detection message sent by the two-way forwarding detection protocol session is a user datagram protocol message, which provides a method for sending encapsulated IP datagrams without establishing a connection. Two types of messages are defined: control messages And echo messages.

Control messages: Sessions at both ends of the link monitor the link status through control messages interactively.

Echo message: One end of the link sends echo messages back by the other end to realize bidirectional monitoring of the link.

Among them, the two-way forwarding detection protocol session establishment process is a three-way handshake process. After this process, the sessions at both ends become Up. During this process, the corresponding parameters are negotiated. The subsequent state changes are carried out based on the defect detection results. , And deal with it accordingly.

The four states of the two-way forwarding detection protocol session establishment process are expressed as follows:

Down : Indicates that the session has started to be created;

Init : Indicates that it is communicating with the peer system;

Up : Indicates that the session is successfully established and the connection between the systems is working normally;

AdminDown : Indicates that the session is forcibly changed to the Down state, which will make the peer enter and remain in the Down state.

Specifically, the end of the establishment of the bidirectional forwarding detection protocol session is A, and the end of the target link gateway address is B.

The two-way forwarding detection protocol session establishment process is detailed as follows:

1 , A and B start the two-way forwarding detection protocol, the initial state of each is Down, and the carrying state of the two-way forwarding detection protocol session message is Down.

2 , End B receives the two-way forwarding detection protocol session message with the status of Down, the local state switches to Init, and sends the two-way forwarding detection protocol session message carrying the state as Init.

3 , After the B-side local two-way forwarding detection protocol session status is Init, the packet with the status Down is not processed again.

4 , A-side two-way forwarding detection protocol session state change process is the same as above.

5 , End B receives a two-way forwarding detection protocol session message with a status of Init, and the local status switches to Up.

6 , The process of the A-side in the two-way forwarding detection protocol session state change is the same as the above.

7 , A and B will start a timeout timer after the change from Down state to Init state occurs. The function of this timer is to prevent the local state from being blocked in the Init state. If the state is not received within the specified time, the state is Init. Or if the Up bidirectional forwarding detection protocol session message, the state automatically switches back to Down.

8 , The local status Up indicates that the session is established successfully.

Among them, if in step 2, end A does not receive a control message with a session status of Down sent by end B within a specified time, end A considers that end B is faulty.

S22 : Determine the link status information according to the response message of the target link gateway address to the detection protocol control message.

Specifically, the two-way forwarding detection protocol actively sends a control message to the target link gateway address end, and the target link gateway address sends a corresponding response message, then the link state information is a link failure; if the target link If the gateway address does not send a corresponding response message, the link status information is that the link is unblocked. Among them, in the process of detecting the link status information, when the two-way forwarding detection protocol session is established, regardless of whether the two-way forwarding detection protocol control message sent by the target link gateway address is received, it will actively send to the target link The gateway address end periodically sends a two-way forwarding detection protocol control message. If the two-way forwarding detection protocol response message from the target link gateway address end is not received within the detection time, it is considered that the corresponding target link gateway address end has a link Road failure. Otherwise, the link is considered unobstructed.

In this embodiment, the detection protocol control message is sent to the target link gateway address through the detection virtual route forwarding instance, and the link state information is determined by the response message of the target link gateway address to the detection protocol control message. Link failure or unblocked link can detect link state information more accurately and stably, improve the responsiveness of network equipment, and thereby improve the performance of network equipment.

In one embodiment, in step S3, forwarding the link state information to the subscribed virtual route forwarding instance specifically includes step S31, which is described in detail as follows:

S31 : Instruct the subscribed virtual route forwarding instance to use link state information as a parameter of the preset callback function, and instruct the subscribed virtual route forwarding instance to execute a preset callback function to obtain link state information, where the preset callback function is to detect the virtual The callback function of the subscription virtual routing and forwarding instance registered in the notification list of the routing and forwarding instance.

Specifically, the link state information is forwarded to the subscription virtual routing forwarding instance through the subscription mechanism, where the subscription mechanism is implemented in a notification linked list mode with one party as the notifier and one party as the receiver. The notification linked list is a function linked list. When an event is notified, the time processing function registered by the receiver is run. When an event occurs, the function registered by the receiver will be executed.

The main elements of the notification list include:

Recipient: A party interested in a certain event. Defines that when an event occurs, the corresponding processing function is executed, that is, the callback function. But it needs to be registered in the notification list in advance.

Notifier: The notifier of the event. When an event is detected, or an event is generated by itself, all parties interested in the event are notified of the occurrence of the event. The notifier defines a notification chain, which stores the callback function of each recipient to the event. The notification process is to traverse each item in the notification chain, and then call the callback function of the corresponding event.

The main process of the operation of the notification list includes:

1 , The notifier defines the notification linked list.

2 , The recipient registers the callback function in the notification list.

3 , When an event occurs, the notifier sends a notification and executes the callback function of all elements in the notification linked list.

Further, when the detection virtual routing and forwarding instance detects link state information, a callback function is triggered, instructing the subscribed virtual routing and forwarding instance to use the detected link state information as a parameter of the callback function, and the subscribing virtual routing and forwarding instance will be the link state The information is substituted into the callback function to run, and the link status information is obtained.

In this embodiment, the subscribed virtual route forwarding instance is pre-registered in the notification linked list, and when the link state information is detected, the subscribed virtual route forwarding instance that subscribes to the link failure information can be quickly and accurately found in the notification linked list, and There is no need to search in every virtual routing and forwarding instance, thereby reducing the occupation of network transmission resources.

In an embodiment, in step S4, the link state information is forwarded to the subscribed virtual route forwarding instance, which specifically further includes step S41, which is described in detail as follows:

S41 : Store the link state information in the preset database, and instruct the subscription virtual routing and forwarding instance to obtain the link state information from the preset database.

Specifically, the preset database is a designated database in the memory of the network device, and is used to store the link state information detected by the two-way forwarding detection protocol session.

Instructs the subscribed virtual routing and forwarding instance to obtain the detected link state information from the specified database. The subscribed virtual route forwarding instance that has obtained the link state information will learn that the physical network interface where the subscribed virtual route forwarding instance is located is faulty, and then clear the local route related to the physical network interface.

In this embodiment, the manner of acquiring the detected link state information from the designated database does not affect the acquisition of the link state information through the subscription mechanism.

Further, there are two ways to forward the link state information to the subscribed virtual route forwarding instance: one is to directly obtain the link state information through the subscription mechanism; the other is to pass the detected link The status information is stored in a preset database, and the link status information is obtained from the preset database. When one method fails, the other method can be used as a backup method. This method of forwarding link state information using active and standby coexistence can improve the ability of network equipment to detect link state information and improve the forwarding of network equipment Ability and responsiveness to improve network equipment performance and network transmission performance.

In one embodiment, as shown in FIG. 3, in step S5, instructing the subscribed virtual route forwarding instance to perform route change processing according to link state information, specifically including steps S51 to S52, which are described in detail as follows:

S51 : If the link status information is a link failure, it instructs to subscribe to the virtual route forwarding instance for route convergence.

Specifically, when it is detected that the link state information in the link is a link failure, it is instructed to subscribe to the virtual route forwarding instance to perform route convergence.

Among them, routing convergence refers to the process that after the topology of the network changes, the routing table is re-established, sent and then learned until it is stable, and all related routers in the network are notified of the change, that is, the process of recalculation caused by changes in the network topology Route and discover the behavior of alternative routes.

S52 : If the link status information indicates that the link is unblocked, it will instruct to subscribe to the virtual route forwarding instance for route restoration.

Specifically, when it is detected that the link state information in the link is that the link is unblocked, it is instructed to subscribe to the virtual route forwarding instance to perform route restoration.

Among them, route restoration refers to the process of re-stabilizing the routing table after route convergence, and notifying all relevant routers in the network to restore the normal network.

In this embodiment, the subscribed virtual route forwarding instance performs different route change processing according to different link state information: when the link fails, the route is converged; the link is unblocked and the route is restored. Among them, the way to obtain link state information and solve link problems by subscribing to the virtual routing and forwarding instance, which is a subscription mechanism, can further reduce the occupation of device resources such as CPU and memory of network devices, and reduce the cost of network transmission resources. Occupy, improve the forwarding ability and responsiveness of network equipment.

In one embodiment, in step S6, after the virtual routing and forwarding instances of the KM virtual local area network sub-interfaces that are not selected are used as subscription virtual routing and forwarding instances, the link status detected by the virtual routing and forwarding instance is acquired. Before information, the link detection method specifically includes step S61, which is described in detail as follows:

S61 : When M is greater than 1, divide the subscription virtual route forwarding instance into M subscription groups, and set the correspondence between each subscription group and each detection virtual route forwarding instance, so that the subscription virtual route in each subscription group The forwarding instance is used to receive the link state information detected by a virtual routing and forwarding instance.

Specifically, when M is 1, only one virtual routing and forwarding instance is selected from the virtual local area network sub-interfaces in the physical network interface as a detection virtual routing and forwarding instance, and the remaining unselected virtual routing and forwarding instances are subscribed as a subscribed virtual routing and forwarding instance for link detection; When M is greater than 1, select M virtual routing and forwarding instances from the virtual local area network sub-interfaces in the physical network interface as detection virtual routing and forwarding instances, and the remaining unselected virtual routing and forwarding instances are used as subscription virtual routing and forwarding instances and divided into M subscription packets. Set the correspondence between each subscription group in the M subscription groups and each detection virtual routing and forwarding instance in the M detection virtual routing and forwarding instances. Among them, each of the M subscription packets only accepts the link state information detected by one detection virtual routing and forwarding instance.

In this embodiment, when the number of physical network interfaces to be detected is large, the subscribed virtual route forwarding instance can be subscribed in a manner of subscribing to grouping, and multiple detection virtual route forwarding instances corresponding to the subscribed grouping can be used to perform link detection. When there are many physical network interfaces that need to be detected, this method can also further reduce the occupation of device resources such as CPU and memory of network equipment, as well as reduce the occupation of network transmission resources, and improve the forwarding and response capabilities of network equipment, thereby Improve network equipment performance and network transmission performance.

It should be understood that the size of the sequence number of each step in the foregoing embodiment does not mean the order of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

In an embodiment, a link detection device is provided, and the link detection device corresponds to the link detection method in the above-mentioned embodiment in a one-to-one correspondence. As shown in FIG. 4, the link detection device includes: an instance object selection module 10, an information acquisition module 20, and an information processing module 30. The detailed description of each functional module is as follows:

The instance object selection module 10 is used to select M virtual local area network sub-interfaces from the K virtual local area network sub-interfaces of a specific physical network interface according to a preset selection method, and forward them in the virtual routing of the selected M virtual local area network sub-interfaces The detection protocol session is established in the instance, the virtual routing and forwarding instance that has established the detection protocol session is used as the detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM virtual local area network sub-interfaces that are not selected are used as the subscription virtual routing and forwarding instances, where, K and M are both positive integers, M<K;

The information acquisition module 20 is configured to acquire link state information detected by the detection virtual routing and forwarding instance;

The information processing module 30 is configured to forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.

Further, the information acquisition module 20 includes:

The message detection submodule 21 is used to instruct the detection virtual route forwarding instance to send a detection protocol control message to the target link gateway address, and receive a response message of the target link gateway address;

The information confirmation sub-module 22 is used to determine the link state information according to the response message of the target link gateway address to the detection protocol control message.

Further, the information processing module 30 includes:

The notification linked list sub-module 31 is used to instruct the subscribed virtual route forwarding instance to use link state information as a parameter of the preset callback function, and instruct the subscribed virtual route forwarding instance to execute the preset callback function to obtain link state information, where the preset The callback function is a callback function for subscribing to the virtual routing and forwarding instance registered in the notification linked list of the detection virtual routing and forwarding instance in advance.

Further, the information processing module 30 also includes:

The database sub-module 32 is used to store the link state information in the preset database, and instruct the subscription virtual route forwarding instance to obtain the link state information from the preset database.

Further, the information processing module 30 also includes:

The route convergence sub-module 33 is configured to, if the link state information is a link failure, instruct to subscribe to the virtual route forwarding instance to perform route convergence;

The route restoration sub-module 34 is configured to, if the link state information is that the link is unblocked, instruct to subscribe to the virtual route forwarding instance to perform route restoration.

Further, the link detection device further includes:

The subscription grouping module 41 is used to divide the subscription virtual route forwarding instance into M subscription groups when M is greater than 1, and set the correspondence between each subscription group and each detection virtual route forwarding instance, so that each subscription The subscribed virtual routing and forwarding instance in the packet is used to receive the link state information detected by a detecting virtual routing and forwarding instance.

For the specific definition of the link detection device, please refer to the above definition of the link detection method, which will not be repeated here. Each module in the above-mentioned link detection device can be implemented in whole or in part by software, hardware, and a combination thereof. The above-mentioned modules may be embedded in the form of hardware or independent of the processor in the computer equipment, or may be stored in the memory of the computer equipment in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned modules.

In an embodiment, a computer device is provided. The computer device may be a network device, and its internal structure diagram may be as shown in FIG. 5. The computer equipment includes a processor, a memory, a network interface, and a database connected through a system bus. Among them, the processor of the computer device is used to provide calculation and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer readable instructions, and a database. The internal memory provides an environment for the operation of the operating system and computer-readable instructions in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. The computer-readable instructions are executed by the processor to realize a link detection method.

In an embodiment, one or more readable storage media storing computer readable instructions are provided. The computer readable storage medium stores computer readable instructions, and the computer readable instructions are executed by one or more processors. When executed, the one or more processors are caused to execute the computer-readable instructions to implement the steps of the link detection method in the foregoing embodiment, for example, steps S1 to S3 shown in FIG. 1. Alternatively, the processor implements the functions of the modules/units of the link detection apparatus in the foregoing embodiment when executing computer-readable instructions, for example, the functions of the modules 10 to 30 shown in FIG. 4. To avoid repetition, I won’t repeat them here. The readable storage medium in this embodiment includes a non-volatile readable storage medium and a volatile readable storage medium.

In one embodiment, a computer-readable storage medium is provided, and computer-readable instructions are stored thereon. The computer-readable instructions implement the link detection method in the above method embodiments when executed by a processor, or the computer may When the read instruction is executed by the processor, the function of each module/unit in the link detection device in the foregoing device embodiment is realized. To avoid repetition, I won’t repeat them here.

A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing relevant hardware through computer-readable instructions, which can be stored in a non-volatile readable storage. The medium may also be stored in a volatile readable storage medium, and when the computer readable instructions are executed, they may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database, or other media used in the embodiments provided in this application may include non-volatile and/or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not a limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Channel (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the division of the above functional units and modules is used as an example. In practical applications, the above functions can be allocated to different functional units and modules as needed. Module completion, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still implement the foregoing The technical solutions recorded in the examples are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the application, and should be included in Within the scope of protection of this application .

Claims (20)

1. A link detection method, wherein the link detection method includes:

   From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, and establish detection in the virtual routing and forwarding instances of the selected M virtual local area network sub-interfaces Protocol session, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM sub-interfaces of the virtual local area network that are not selected are used as subscription virtual routing and forwarding Examples, where K and M are both positive integers, and M<K;

   Acquiring link state information detected by the detected virtual routing and forwarding instance;

   Forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.
2. 5. The link detection method according to claim 1, wherein said obtaining the link state information detected by the detection virtual route forwarding instance comprises:

   Instruct the detection virtual route forwarding instance to send a detection protocol control message to the target link gateway address, and receive a response message of the target link gateway address;

   The link state information is determined according to the response message of the target link gateway address to the detection protocol control message.
3. The link detection method according to claim 1, wherein said forwarding said link state information to said subscribed virtual route forwarding instance comprises:

   Instruct the subscribed virtual route forwarding instance to use the link state information as a parameter of a preset callback function, and instruct the subscribed virtual route forwarding instance to execute the preset callback function to obtain the link state information, wherein: The preset callback function is a callback function of the subscribed virtual route forwarding instance registered in the notification linked list of the detected virtual route forwarding instance in advance.
4. The link detection method according to claim 1, wherein said forwarding said link state information to said subscribed virtual route forwarding instance further comprises:

   The link state information is stored in a preset database, and the subscribed virtual route forwarding instance is instructed to obtain the link state information from the preset database.
5. The link detection method according to claim 1, wherein the instructing the subscribed virtual route forwarding instance to perform route change processing according to the link state information comprises:

   If the link state information is a link failure, instruct the subscribed virtual route forwarding instance to perform route convergence;

   If the link state information indicates that the link is unblocked, the subscribed virtual route forwarding instance is instructed to perform route restoration.
6. The link detection method according to claim 1, wherein, after the virtual routing and forwarding instances of the KM sub-interfaces of the virtual local area network that are not selected are used as subscription virtual routing and forwarding instances, and after the obtaining Before the detecting the link state information detected by the virtual route forwarding instance, the link detection method further includes:

   When M is greater than 1, divide the subscription virtual routing and forwarding instances into M subscription groups, and set the correspondence between each subscription group and each detection virtual routing and forwarding instance, so that each The subscription virtual routing and forwarding instance in the subscription packet is used to receive the link state information detected by the detecting virtual routing and forwarding instance.
7. A link detection device, wherein the link detection device includes:

   The instance object selection module is used to select M virtual local area network sub-interfaces from the K virtual local area network sub-interfaces of a specific physical network interface according to a preset selection method, and select M virtual local area network sub-interfaces in the selected M virtual local area network sub-interfaces. A detection protocol session is established in a virtual routing and forwarding instance, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routes of the KM sub-interfaces of the virtual local area network that have not been selected The forwarding instance is used as a subscription virtual routing forwarding instance, where K and M are both positive integers, and M<K;

   An information acquisition module, configured to acquire link state information detected by the virtual routing and forwarding detection instance;

   The information processing module is configured to forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.
8. 8. The link detection device according to claim 7, wherein the information processing module comprises:

   The notification linked list sub-module instructs the subscribed virtual route forwarding instance to use the link state information as a parameter of a preset callback function, and instructs the subscribed virtual route forwarding instance to execute the preset callback function to obtain the link State information, wherein the preset callback function is a callback function of the subscribed virtual route forwarding instance registered in the notification linked list of the detected virtual route forwarding instance in advance.
9. A computer device includes a memory, a processor, and computer-readable instructions that are stored in the memory and can run on the processor, wherein the processor implements the following steps when the processor executes the computer-readable instructions:

   From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, and establish detection in the virtual routing and forwarding instances of the selected M virtual local area network sub-interfaces Protocol session, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM sub-interfaces of the virtual local area network that are not selected are used as subscription virtual routing and forwarding Examples, where K and M are both positive integers, and M<K;

   Acquiring link state information detected by the detected virtual routing and forwarding instance;

   Forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.
10. 9. The computer device according to claim 9, wherein said acquiring the link state information detected by said detecting virtual routing and forwarding instance comprises:

    Instruct the detection virtual route forwarding instance to send a detection protocol control message to the target link gateway address, and receive a response message of the target link gateway address;

    The link state information is determined according to the response message of the target link gateway address to the detection protocol control message.
11. 9. The computer device according to claim 9, wherein said forwarding said link state information to said subscription virtual route forwarding instance comprises:

    Instruct the subscribed virtual route forwarding instance to use the link state information as a parameter of a preset callback function, and instruct the subscribed virtual route forwarding instance to execute the preset callback function to obtain the link state information, wherein: The preset callback function is a callback function of the subscribed virtual route forwarding instance registered in the notification linked list of the detected virtual route forwarding instance in advance.
12. 9. The computer device according to claim 9, wherein said forwarding said link state information to said subscribed virtual route forwarding instance further comprises:

    The link state information is stored in a preset database, and the subscribed virtual route forwarding instance is instructed to obtain the link state information from the preset database.
13. 9. The computer device according to claim 9, wherein the instructing the subscribed virtual route forwarding instance to perform route change processing according to the link state information comprises:

    If the link state information is a link failure, instruct the subscribed virtual route forwarding instance to perform route convergence;

    If the link state information indicates that the link is unblocked, the subscribed virtual route forwarding instance is instructed to perform route restoration.
14. The computer device according to claim 9, wherein, after the virtual routing and forwarding instances of the KM virtual local area network sub-interfaces that are not selected are used as subscription virtual routing and forwarding instances, and after the obtaining of the Before detecting the link state information detected by the virtual routing and forwarding instance, it includes:

    When M is greater than 1, divide the subscription virtual routing and forwarding instances into M subscription groups, and set the correspondence between each subscription group and each detection virtual routing and forwarding instance, so that each The subscription virtual routing and forwarding instance in the subscription packet is used to receive the link state information detected by the detecting virtual routing and forwarding instance.
15. One or more readable storage media storing computer readable instructions. The computer readable storage medium stores computer readable instructions. When the computer readable instructions are executed by one or more processors, the The one or more processors execute the following steps:

    From the K virtual local area network sub-interfaces of a specific physical network interface, select M virtual local area network sub-interfaces according to a preset selection method, and establish detection in the virtual routing and forwarding instances of the selected M virtual local area network sub-interfaces Protocol session, the virtual routing and forwarding instance that has established the detection protocol session is used as a detection virtual routing and forwarding instance, and the virtual routing and forwarding instances of the KM sub-interfaces of the virtual local area network that are not selected are used as subscription virtual routing and forwarding Examples, where K and M are both positive integers, and M<K;

    Acquiring link state information detected by the detected virtual routing and forwarding instance;

    Forward the link state information to the subscribed virtual route forwarding instance, and instruct the subscribed virtual route forwarding instance to perform route change processing according to the link state information.
16. 15. The readable storage medium according to claim 15, wherein said acquiring the link state information detected by said detecting virtual routing and forwarding instance comprises:

    Instruct the detection virtual route forwarding instance to send a detection protocol control message to the target link gateway address, and receive a response message of the target link gateway address;

    The link state information is determined according to the response message of the target link gateway address to the detection protocol control message.
17. 15. The readable storage medium according to claim 15, wherein said forwarding said link state information to said subscription virtual route forwarding instance comprises:

    Instruct the subscribed virtual route forwarding instance to use the link state information as a parameter of a preset callback function, and instruct the subscribed virtual route forwarding instance to execute the preset callback function to obtain the link state information, wherein: The preset callback function is a callback function of the subscribed virtual route forwarding instance registered in the notification linked list of the detected virtual route forwarding instance in advance.
18. 15. The readable storage medium according to claim 15, wherein said forwarding said link state information to said subscription virtual route forwarding instance further comprises:

    The link state information is stored in a preset database, and the subscribed virtual route forwarding instance is instructed to obtain the link state information from the preset database.
19. 15. The readable storage medium according to claim 15, wherein the instructing the subscribed virtual route forwarding instance to perform route change processing according to the link state information comprises:

    If the link state information is a link failure, instruct the subscribed virtual route forwarding instance to perform route convergence;

    If the link state information indicates that the link is unblocked, the subscribed virtual route forwarding instance is instructed to perform route restoration.
20. The readable storage medium according to claim 15, wherein, after the virtual routing and forwarding instances of the KM virtual local area network sub-interfaces that are not selected are used as subscription virtual routing and forwarding instances, and after the obtaining The link state information detected by the detecting virtual routing and forwarding instance before includes:

    When M is greater than 1, divide the subscription virtual routing and forwarding instances into M subscription groups, and set the correspondence between each subscription group and each detection virtual routing and forwarding instance, so that each The subscription virtual routing and forwarding instance in the subscription packet is used to receive the link state information detected by the detecting virtual routing and forwarding instance.