WO2021259352A1 - Data packet forwarding method and apparatus, and network device - Google Patents

Abstract

The present application relates to the technical field of communications and provides a data packet forwarding method and apparatus, and a network device. The method comprises: obtaining a network packet received by a network device, and determining whether the network packet is an abnormal packet; if yes, setting an abnormal identifier for the abnormal packet; and searching in a preset routing table for routing information corresponding to the abnormal identifier, and forwarding the network packet according to the found routing information.

Description

Data packet forwarding method, device and network equipment

cross reference

The present invention claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 202010595491.4, and the invention title is "Data packet forwarding method, device and network equipment" on June 24, 2020. The entire content of the application is by reference Incorporate in the present invention.

Technical field

This application relates to the field of communication technology, and in particular to a method, device and network equipment for forwarding data packets.

Background technique

At present, the quality of the communication link can be judged through the quality parameters of the link, and network switching can be performed when it is judged that the currently used communication link has poor network quality, so as to ensure the normality of the link.

However, in some cases, it is difficult to obtain the quality parameters of the link. For example, when the network is completely disconnected, the delay data of the network cannot be counted. Therefore, when the network is completely disconnected, it is difficult to achieve a perfect network distribution, which leads to the unsmooth network and reduces the user experience.

Summary of the invention

In view of this, this application provides a data packet forwarding method, device and network equipment to alleviate the above technical problems.

In the first aspect, an embodiment of the present application provides a data packet forwarding method, which is applied to a network device, and the method includes: obtaining a network packet received by the network device, and determining whether the network packet is an abnormal packet; if so, An abnormal identifier is set for the abnormal packet; routing information corresponding to the abnormal identifier is searched in a preset routing table, and the network packet is forwarded according to the found routing information.

In the second aspect, an embodiment of the present application provides a data packet forwarding device, which is applied to a network device, and the device includes: a judgment module for obtaining a network packet received by the network device, and judging whether the network packet is abnormal Packet; a setting module for setting an abnormality identifier for the abnormal packet when the judgment result of the judgment module is yes; a forwarding module for looking up routing information corresponding to the abnormality identifier in a preset routing table, The network packet is forwarded according to the found routing information.

In the third aspect, an embodiment of the present application provides a network device including a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the processor executes the computer program, Implement the method described in the first aspect above.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium with a computer program stored on the computer-readable storage medium, and the computer program executes the method described in the first aspect when the computer program is run by a processor.

The data packet forwarding method, device, and network equipment provided in the embodiments of the present application can obtain the network packet received by the network device, and when it is determined that the network packet is an abnormal packet, set an abnormality identifier for the abnormal packet; The routing information corresponding to the abnormal identifier is searched in the routing table, and the network packet is forwarded according to the found routing information, and the network packet can still be forwarded, thereby ensuring the smoothness of the network and improving the user experience.

In order to make the implementation scheme of the present application more obvious and understandable, the following detailed descriptions are given in the following with various embodiments and accompanying drawings.

Description of the drawings

In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the specific embodiments or the description of the prior art. Obviously, the appendix in the following description The drawings are some embodiments of the application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a flowchart of a data packet forwarding method provided by an embodiment of the application;

Figure 2 is a schematic diagram of a firewall architecture provided by an embodiment of the application;

FIG. 3 is a flowchart of another data packet forwarding method provided by an embodiment of the application;

FIG. 4 is a schematic structural diagram of a data packet forwarding apparatus provided by an embodiment of the application;

FIG. 5 is a schematic structural diagram of a network device provided by an embodiment of this application.

detailed description

In order to make the technical solutions of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of this application.

At present, in the prior art, the quality of the link is usually judged by the quality parameter of the link, for example, a judgment is made for the delay of the application and so on. However, in some cases, the delay cannot be judged. For example, when the network is completely disconnected, it is impossible to count the delay data for TCP (Transmission Control Protocol) interaction. Therefore, when the network is completely disconnected, it cannot be done. A perfect network distribution.

In addition, there are other solutions that count the RTT (Round Trip Time) time of each TCP stream for the TCP itself. By counting these RTT times, the current network quality can also be judged. The higher the RTT, the higher the RTT. The worse the network quality. However, this method also has certain limitations. For example, in the current era of mobile games, most of the implementations of mobile games are implemented using UDP (User Datagram Protocol, User Datagram Protocol) protocol to achieve statistics. The RTT time technology is limited to detecting TCP-type packets, and cannot be judged for UDP-type packets. This is because the UDP protocol does not have the so-called RTT time. Therefore, in the case of the UDP protocol, it is difficult to count the RTT time. Way to judge the quality of the link.

Based on this, the data packet forwarding method, device, and network equipment provided by the embodiments of the present application can effectively alleviate the above-mentioned technical problems.

In order to facilitate the understanding of this embodiment, a method for forwarding a data packet disclosed in the embodiment of the present application is first introduced in detail.

Specifically, an embodiment of the present application provides a method for forwarding a data packet, which is applied to a network device, as shown in FIG. 1 is a flowchart of a method for forwarding a data packet, and the method includes the following steps.

Step S102: Obtain the network packet received by the network device, and determine whether the network packet is an abnormal packet.

Step S104, if yes, set an abnormality flag for the abnormal packet.

Specifically, the network packet in the embodiment of this application refers to a data packet transmitted in a network using a specified protocol, such as ICMP (Internet Control Message Protocol, Internet Control Message Protocol) packet, DNS (Domain Name System Service Protocol) , Domain Name System) packets, game packets, etc., these packets follow a certain network protocol when they are transmitted on the network link, and carry corresponding packet information, such as protocol type, identification, IP address, etc., the above steps The judging process of the abnormal packet in S102 can be realized according to the corresponding packet information, and then judge whether it is an abnormal packet, and if it is judged to be an abnormal packet, continue to execute the following step S106 to forward the abnormal packet.

Step S106, searching for routing information corresponding to the abnormal identifier in the preset routing table, and forwarding the network packet according to the found routing information.

Specifically, the preset routing table is usually a routing table pre-stored in the network device, including an abnormal identifier and routing information corresponding to the abnormal identifier, so that when the corresponding routing information is found, it can be based on the search The arrived routing information determines the next hop of the abnormal packet to facilitate the forwarding of the abnormal packet.

The data packet forwarding method provided by the embodiment of the application can obtain the network packet received by the network device, and when it is determined that the network packet is an abnormal packet, set an abnormal identifier for the abnormal packet; The routing information corresponding to the abnormal identifier is forwarded to the network packet according to the found routing information. The above is the method of searching routing information for the abnormal packet, which can still forward the network packet when the network packet is abnormal, thereby ensuring the network's integrity Smooth, improve user experience.

In actual use, the above-mentioned network equipment usually includes physical physical equipment connected to the network, such as switches, bridges, routers, gateways, etc., and, in order to provide users with a safe network environment, the network equipment is usually configured with a firewall architecture , And the firewall architecture generally includes multiple detection nodes, each detection node is also registered with a preset callback function, and multiple detection nodes are connected in sequence to form a network packet propagation link.

For ease of understanding, FIG. 2 shows a schematic diagram of a firewall architecture. Specifically, in the embodiment of the present application, the firewall architecture is Linux kernel netfilter firewall architecture as an example for description. The firewall architecture is equivalent to a filter architecture. Analyze and process the received network packets. Specifically, the firewall architecture is implemented based on the netfilter firewall technology, which can implement all packets in and out on the kernel side. In specific implementation, the firewall architecture may have multiple nodes on the link for sending, receiving, and routing network packets. The detection node in the embodiment of the present application is a part or all of the multiple nodes to achieve this The data packet forwarding method provided in the application embodiment.

In actual use, the Netfilter firewall is usually a data packet processing module inside the core layer of the Linux operating system, which usually has the following functions: network address translation, data packet content modification, and data packet filtering, etc., and the above nodes are also called Mount point, or callback function point, in order to mount the registered callback function. When the network packet arrives at these locations, you can actively call back to adjust the number, so that the routing direction can be changed when the network packet is routed. Specifically, as shown in Figure 2, the nodes of the Linux kernel netfilter firewall architecture include PRE_ROUTING, LOCAL_IN, LOCAL_OUT, FORWARD, POST_ROUTING, etc., and in the embodiment of this application, the abnormality of the network packet is judged, and the process of forwarding the network packet, All are based on these nodes. Therefore, on the basis of FIG. 1 and FIG. 2, FIG. 3 also shows a flowchart of another data packet forwarding method, which further explains the data forwarding process of the embodiment of the present application, as shown in FIG. 3, including The following steps.

Step S302: Obtain the network packet received by the network device.

Specifically, based on the firewall architecture shown in Figure 2, network packets can enter the network device in the layer 2 processing module, and then be transmitted along the propagation link to the next node in the direction indicated by the arrow to further perform the following steps .

Step S304: Extract the packet information of the network packet; where the packet information includes at least one of the following: protocol type and identity ID.

Step S306: Determine whether the network packet is an abnormal packet according to the packet information.

Step S308, if yes, set an exception flag for the abnormal packet.

In actual use, considering that there can be multiple types of network packets If the protocol type is an ICMP packet, after extracting the packet information, the category identifier of the ICMP packet can be obtained; then it is determined whether the category identifier is a preset abnormal identifier; if it is, the network packet is determined to be an abnormal packet.

Further, in order to facilitate the judgment of whether the ICMP packet is an abnormal packet, a comparison table of the type identification of the ICMP packet is generally pre-stored in the network equipment, so that when the packet information of the network packet is extracted, it is judged whether the type identification is It is an abnormal identification, and then it is determined whether the ICMP packet is an abnormal packet.

For ease of understanding, Table 1 shows a comparison table of the category identifiers of ICMP packets, as shown in Table 1:

Message Type	ICMP message function
0	Echo Reply
3	Destination Unreachable
4	Source quench
5	Redirect changes the transmission path
8	Echo request
11	Time Exceeded for a datagram overflow transmission

12	Parametre Problem On a datagram parameter problem
13	Timestamp request time label requirements
14	Timestamp reply
15	Information request
16	Information reply
17	Address mask request
18	Address mask reply Address mask reply

Among them, in the above Table 1, the Message Type in the first column is the category identifier, and the second column is the corresponding ICMP message function. Generally, if the category identifier of the ICMP packet extracted in step S304 is the category identifier in the first column, It can be determined that the ICMP packet is an abnormal packet, and then continue to step S308 to set an abnormality identifier for the abnormal packet. If the category identifier of the ICMP packet extracted in step S304 is not any of the category identifiers in the first column of Table 1, It means that the ICMP packet is a normal network packet, and it can be forwarded normally according to the propagation link shown in Figure 2. At this time, each node of the firewall architecture processes and forwards the network packet according to the conventional processing method.

It should be understood that what Table 1 shows is only a feasible comparison table for the category identifiers of ICMP packets. In other embodiments, the content of the comparison table can be set according to actual usage. For example, there may be other types of category identifiers. The logo, or remove some disabled logos, etc., are specifically set according to actual usage conditions, which are not limited in the embodiments of the present application.

In actual use, based on the firewall architecture shown in Figure 2, the above processing of ICMP packets can be implemented in the PRE_ROUTING node. At this time, the PRE_ROUTING node is used as a detection node in the embodiment of the present application, which can detect the category identifier of the ICMP packet. , And then determine whether the ICMP packet is an abnormal packet.

Further, if the protocol type of the network packet is a DNS packet, the DNS code of the DNS packet is obtained; and it is determined whether the DNS code is a preset abnormal code; if it is, it is determined that the network packet is an abnormal packet.

In specific implementation, the above-mentioned network device will also pre-store the abnormal code table of the DNS packet. When it is determined that the network packet is a DNS packet based on the protocol type of the packet information, it can further obtain the DNS code of the DNS packet and query the abnormal code Table to determine whether the DNS packet is an abnormal packet.

Further, the above DNS code usually refers to the RCODE in the DNS packet. The above processing process for the DNS packet can also be implemented in the PRE_ROUTING node of the firewall architecture shown in FIG. 2. At this time, the PRE_ROUTING node is still a detection node in the embodiment of the present application. , The DNS code of the DNS packet can be checked to determine whether the DNS packet is an abnormal packet.

In addition, the data packet forwarding method provided by the embodiment of the application can also process game packets. Specifically, if the identity ID of the above network packet is a game packet, it is determined whether the time interval for receiving the game packet is greater than the preset Time interval; if it is, it is determined that the network packet is an abnormal packet.

Specifically, taking the game packets of mobile games as an example, most of the current mobile games themselves also have the function of detecting network latency, mainly through several common methods, such as establishing a special UDP port. Specially send and receive game packets regularly, or send fixed-size game packets regularly, and so on. The embodiment of this application uses the Linux kernel netfilter firewall architecture to monitor the entry and exit of all game packets on the kernel side. Therefore, in this embodiment of the application, the above steps S304 to S306 can be used to determine the identity ID on the kernel side. Which network packets are game packets for mobile game applications? Specifically, you can determine whether the current network is abnormal through the special timing monitoring behavior of each game. For example, through the special timing monitoring behavior to determine whether the time interval for receiving the game packet is greater than The preset time interval and so on. If it is greater than the preset time interval, it means that the network is abnormal. At this time, the received network packet is an abnormal packet. At this time, the next network packet can be marked with different mark values, and different mark values can be matched to query different ones. The routing table allows data packets to go to different interfaces to access the network.

Specifically, based on the firewall architecture shown in Figure 2, the above processing of game packets can be performed at the LOCAL_IN node in Figure 2. After the network packets enter the network device through the data packet entry in Figure 2, they can be propagated along The link is transmitted to the LOCAL_IN node via the PRE_ROUTING node, and the LOCAL_IN node determines whether the time interval for receiving the game packet is greater than the preset time interval, and if so, it is determined that the network packet is an abnormal packet.

In addition, for game packets, the game type can also be determined through the packet information carried in the game packet, so as to detect whether the game sends a special UDP packet behavior. If the timing sending behavior is detected, you can use this Behavior to determine whether the interval time of each packet is regular. If it is irregular, it means that the network environment may be poor at that time, leading to packet loss or delay. Example: A game application sends a 60-length packet every 3 seconds, so we should be able to monitor on the kernel side that a 60-length udp packet is received every 3 seconds. If suddenly the interval time is prolonged or lost, we can judge that the network quality is poor and the delay is caused. At this time, we can continue to perform the following step S310 to forward the game packet to maintain the game experience.

In step S310, the routing information corresponding to the abnormal identifier is searched in the preset routing table, and the network packet is forwarded according to the searched routing information.

Specifically, in this step, the step of forwarding the network packet according to the found routing information includes: switching the first network currently used by the network device to the backup second network according to the found routing information; The routing information forwards network packets.

In actual use, the above-mentioned first network and second network may be a wireless wifi network and a telecommunication data network. Therefore, the first network is switched to the standby second network, which may be the wireless wifi network is switched to the telecommunication data network. The above-mentioned first and second networks may also be 5G telecommunication data networks and 4G telecommunication data networks. Therefore, the switching of the first network to the backup second network may be the switching of the wireless 5G telecommunication data network to the 4G telecommunication data network.

Further, after switching the first network currently used by the network device to the backup second network, the number of network packets forwarded through the second network can be continued to be recorded; if the number of network packets forwarded by the second network exceeds the preset number Threshold, the second network can be further switched to the first network, that is, switching between a wireless wifi network and a telecommunication data network, or switching between a 5G telecommunication data network and a 4G telecommunication data network can be realized.

In actual use, the above switching process is quite an exit mechanism, so as not to return to the first network interface for transmission after the network is switched to the second network, it can be implemented every 10 or 20 packets/DNS query / During transmission, an interface automatically switched back to try to transmit. If there is normal interaction on the first interface, the subsequent network packets can be switched back to the first network for transmission. If the first network is still abnormal, continue to use the second network interface to send network packets, so as to keep the network sending normally.

Further, on the basis of the above-mentioned embodiment, an embodiment of the present application also provides a data packet forwarding device, which is applied to network equipment. As shown in FIG. 4, a schematic structural diagram of a data packet forwarding device includes The following modules.

The judging module 40 is configured to obtain the network packet received by the network device, and determine whether the network packet is an abnormal packet.

The setting module 42 is configured to set an abnormality identifier for the abnormal packet when the judgment result of the judgment module is yes.

The forwarding module 44 is configured to search for routing information corresponding to the abnormal identifier in a preset routing table, and forward the network packet according to the searched routing information.

The data packet forwarding device provided in the embodiment of the present application has the same technical features as the data packet forwarding method provided in the foregoing embodiment, so it can also solve the same technical problem and achieve the same technical effect.

Further, an embodiment of the present application also provides a network device, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, and the processor implements the foregoing when the computer program is executed. The method described in Figure 1 or Figure 3.

Further, an embodiment of the present application also provides a schematic structural diagram of a network device. As shown in FIG. 5, it is a schematic structural diagram of the network device. The network device includes a processor 101 and a memory 100, and the memory 100 stores A computer-executable instruction executed by the processor 101, and the processor 101 executes the computer-executable instruction to implement the foregoing data packet forwarding method.

In the embodiment shown in FIG. 5, the network device further includes a bus 102 and a communication interface 103, where the processor 101, the communication interface 103, and the memory 100 are connected through the bus 102.

The memory 100 may include a high-speed random access memory (RAM, Random Access Memory), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 103 (which may be wired or wireless), and the Internet, a wide area network, a local network, a metropolitan area network, etc. may be used. The bus 102 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect, peripheral component interconnection standard) bus, or an EISA (Extended Industry Standard Architecture) bus or the like. The bus 102 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one bidirectional arrow is used to indicate in FIG. 5, but it does not mean that there is only one bus or one type of bus.

The processor 101 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 101 or instructions in the form of software. The aforementioned processor 101 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP), etc.; it may also be a digital signal processor (Digital Signal Processor, DSP for short), etc. ), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor 101 reads the information in the memory, and completes the steps of the data packet forwarding method of the foregoing embodiment in combination with its hardware.

Further, an embodiment of the present application also provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program, and the computer program executes the method shown in FIG. 1 or FIG. 3 when the computer program is run by a processor.

The data packet forwarding method, device, and computer program product of the network device provided by the embodiments of the present application include a computer-readable storage medium storing program code, and the instructions included in the program code can be used to execute the instructions in the previous method embodiments. For the specific implementation of the method described above, please refer to the method embodiment, which will not be repeated here.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the network equipment and device described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In addition, in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those skilled in the art, the specific meaning of the above-mentioned terms in this application can be understood under specific circumstances.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes. .

In the description of this application, it should be noted that the terms "first", "second", and "third" are only used for description, and cannot be understood as indicating or implying relative importance.

Finally, it should be noted that the above examples are only specific implementations of the application, which are used to illustrate the technical solutions of the application, not to limit it. The protection scope of the application is not limited thereto, although referring to the foregoing examples This application has been described in detail, and those skilled in the art should understand that any person skilled in the art within the technical scope disclosed in this application can still modify the technical solutions described in the foregoing embodiments or can easily imagine Changes, or equivalent replacements of some of the technical features; these modifications, changes, 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 this application, and should be covered by the scope of protection of this application Inside. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims (11)

1. A method for forwarding data packets, wherein, when applied to a network device, the method includes:

   Acquiring the network packet received by the network device, and determining whether the network packet is an abnormal packet;

   If yes, set an exception identifier for the abnormal packet;

   The routing information corresponding to the abnormal identifier is searched in a preset routing table, and the network packet is forwarded according to the searched routing information.
2. The method according to claim 1, wherein the network device is configured with a firewall architecture, the firewall architecture includes a plurality of detection nodes, each of the detection nodes is registered with a preset callback function, and a plurality of the detection nodes Connect sequentially to form the propagation link of the network packet.
3. The method according to claim 2, wherein the step of determining whether the network packet is an abnormal packet comprises:

   Extract the packet information of the network packet; wherein, the packet information includes at least one of the following: protocol type and identity ID;

   Determine whether the network packet is an abnormal packet according to the packet information.
4. The method according to claim 3, wherein the step of judging whether the network packet is an abnormal packet according to the packet information comprises:

   If the protocol type of the network packet is an ICMP packet, acquiring the category identifier of the ICMP packet;

   Judging whether the category identifier is a preset abnormal identifier;

   If it is, it is determined that the network packet is an abnormal packet.
5. The method according to claim 3, wherein the step of judging whether the network packet is an abnormal packet according to the packet information comprises:

   If the protocol type of the network packet is a DNS packet, obtain the DNS code of the DNS packet;

   Judging whether the DNS code is a preset abnormal code;

   If it is, it is determined that the network packet is an abnormal packet.
6. The method according to claim 3, wherein the step of judging whether the network packet is an abnormal packet according to the packet information comprises:

   If the identity ID of the network packet is a game packet, determining whether the time interval for receiving the game packet is greater than a preset time interval;

   If it is, it is determined that the network packet is an abnormal packet.
7. The method according to claim 1, wherein the step of forwarding the network packet according to the found routing information comprises:

   Switch the first network currently used by the network device to the backup second network according to the found routing information;

   The network packet is forwarded according to the routing information through the second network.
8. The method according to claim 7, wherein the method further comprises:

   After switching the first network currently used by the network device to the backup second network, recording the number of the network packets forwarded through the second network;

   If the number of the network packets forwarded by the second network exceeds a preset number threshold, the second network is switched to the first network.
9. A data packet forwarding device, which is applied to network equipment, and the device includes:

   The judgment module is used to obtain the network packet received by the network device, and judge whether the network packet is an abnormal packet;

   A setting module, which is used to set an abnormal identifier for the abnormal packet when the judgment result of the judgment module is yes;

   The forwarding module is configured to search for routing information corresponding to the abnormal identifier in a preset routing table, and forward the network packet according to the searched routing information.
10. A network device, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, wherein the processor implements any of claims 1-8 when the computer program is executed. The method described in one item.
11. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is run by a processor, the method according to any one of claims 1-8 is executed.

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