CN117955908B - NDN network slicing method, device, equipment and medium based on SDN controller - Google Patents

Abstract

The application relates to an NDN network slicing method, device, equipment and medium based on an SDN controller, wherein slicing paths with different measurement characteristics of an NDN router are calculated, and a forwarding table of the slicing paths is obtained; issuing the forwarding table to the NDN router; and selecting a corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message based on the measurement characteristic of the NDN message. The method solves the problem that the NDN network can not meet the differentiated requirements of different types of services on network performance, and realizes the isolation of different service flows in the NDN network, thereby meeting the requirements of different communication transmission service characteristics.

Description

NDN network slicing method, device, equipment and medium based on SDN controller

Technical Field

The present application relates to the field of network transmission technology, and in particular to an NDN network slicing method, apparatus, device and medium based on an SDN controller.

Background technique

Named Data Networking (NDN) is a representative information-centric network solution. It completely abandons the address-based communication method and adopts a content-based addressing method. It naturally supports content caching and multicast features. It has broad application prospects in video conferencing, in-vehicle networks, video on demand, file transfer and other fields.

Different services have very different requirements for network bandwidth and latency. For example, video conferencing has high requirements for network latency and security performance, high-definition map downloads in vehicle networks require large bandwidth, and video on demand has requirements for network bandwidth and latency. However, when the NDN network was first designed, it did not distinguish between the types of services in the network, and provided the same forwarding processing method for different types of services, ignoring the differentiated requirements of different types of services for network performance. As a result, the end-to-end service support capability is not ideal, and the service level agreement (SLA) of the service cannot be guaranteed, and the dynamic deployment and flexible adjustment of the service cannot be met.

Regarding the problem in related technologies that NDN networks cannot meet the differentiated network performance requirements of different types of services, no effective solution has been proposed yet.

Summary of the invention

Based on this, it is necessary to provide an NDN network slicing method, device, equipment and medium based on an SDN controller to address the above technical problems.

In a first aspect, an embodiment of the present application provides an NDN network slicing method based on an SDN controller, wherein the SDN controller establishes a BGP-LS neighbor relationship with an NDN router, and the method includes:

Calculating slice paths of different metric characteristics of the NDN router, and obtaining a forwarding table of the slice path;

Sending the forwarding table to the NDN router;

Based on the metric characteristics of the NDN message, the NDN router selects a corresponding slice path in the forwarding table to route and forward the NDN message.

In one embodiment, calculating the slice paths of different metric characteristics of the NDN router and obtaining the forwarding table of the slice paths includes:

Collecting named data link state routing protocol information and network reachability layer information of the NDN router;

Based on the named data link state routing protocol information and the network reachability layer information, slice paths with different metric characteristics are calculated for the NDN router to obtain a forwarding table of the slice paths.

In one of the embodiments, the NDN message includes an NDN interest packet, and the selecting, based on the metric characteristics of the NDN message, a corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message includes:

Adding a slice identifier to the NDN interest packet to identify the metric characteristics of the NDN message;

Based on the slice identifier in the NDN interest packet, a corresponding forwarding table is selected on the NDN router to route and forward the NDN message.

In one embodiment, before selecting a corresponding forwarding table on the NDN router to route and forward the NDN message, the process includes:

Determine whether the NDN message requires network slicing for routing and forwarding;

If yes, based on the slice identifier in the NDN interest packet, select a corresponding forwarding table on the NDN router to route and forward the NDN message;

If not, the NDN message is routed and forwarded according to the local routing forwarding table of the NDN router.

In one of the embodiments, the forwarding table includes a forwarding information table and a slice identifier mapping table of a slice interface; the forwarding information table is used to determine a layer-3 output interface according to a request content name of the NDN interest packet, and the slice identifier mapping table is used to determine reserved resources under the layer-3 output interface according to a slice identifier of the NDN interest packet.

In one embodiment, routing and forwarding the NDN message according to the corresponding forwarding table includes:

Query the content cache table of the intermediate routing node according to the requested content name of the NDN Interest packet. If the query is successful, return the matching NDN data packet from the resource reservation channel and discard the NDN Interest packet.

If no matching NDN data packet is found in the content cache table, query the pending interest table according to the request content name of the NDN interest packet. If the query is successful, record the resource reservation channel information of the NDN interest packet of the node into the pending interest table and discard the NDN interest packet.

If the query in the content cache table and the pending interest table is unsuccessful, the three-layer output interface is queried in the forwarding information table according to the requested content name, and the slice identifier mapping table is queried according to the slice identifier in the NDN interest packet to determine the reserved resources under the three-layer output interface, and the NDN interest packet is forwarded from the reserved resources to other routing nodes.

In one embodiment, the method further comprises:

If the query of the forwarding information table according to the request content name fails or the query of the slice identifier mapping table according to the slice identifier in the NDN interest packet fails, the NDN interest packet is discarded.

In a second aspect, an embodiment of the present application further provides an NDN network slicing device based on an SDN controller, wherein the SDN controller establishes a BGP-LS neighbor relationship with an NDN router, and the device includes:

A calculation module, used to calculate slice paths of different metric characteristics for the NDN router and obtain a forwarding table of the slice path;

A sending module, used for sending the forwarding table to the NDN router;

The forwarding module is used to select a corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message based on the metric characteristics of the NDN message.

In a third aspect, an embodiment of the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the method as described in the first aspect above.

In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the storage medium stores a computer program, wherein when the computer program is executed by a processor, the method described in the first aspect above is implemented.

The above-mentioned NDN network slicing method, device, equipment and medium based on the SDN controller, the SDN controller calculates the slice paths with different metric characteristics for the NDN router, divides the paths, and then sends the forwarding table of the slice paths with different metric characteristics calculated above to the NDN router. The SDN controller selects the corresponding slice path in the forwarding table on the NDN router according to the requirements of different business characteristics to route and forward the message, which solves the problem that the NDN network cannot meet the differentiated requirements of different types of services for network performance, and realizes the isolation of different business traffic in the NDN network, thereby meeting the requirements of different communication transmission business characteristics. At the same time, through the separation of the control plane and the forwarding plane, the SDN controller can centrally control and manage the entire NDN network, dynamically configure and flexibly schedule according to the requirements of network slicing to meet the characteristics of different network slices, and the data plane only needs to look up the table for forwarding, which improves the efficiency of NDN network slicing.

The details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

FIG1 is a hardware structure block diagram of a terminal device of an NDN network slicing method based on an SDN controller in an embodiment;

FIG2 is a flow chart of an NDN network slicing method based on an SDN controller in one embodiment;

FIG3 is a schematic diagram of an NDN topology prefix NLRI protocol message format in an embodiment;

FIG4 is a schematic diagram of a packet format after an NDN interest packet is extended in one embodiment;

FIG5 is a schematic diagram of a flow chart of an NDN message forwarding process in an embodiment;

FIG6 is a structural block diagram of an NDN network slicing device based on an SDN controller in an embodiment;

FIG. 7 is a schematic diagram of the structure of a computer device in an embodiment.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

Network slicing is a new type of network architecture that provides multiple logical networks on the same shared network infrastructure, each of which serves a specific business type or industry user. Through network slicing, operators can build multiple dedicated, virtualized, and isolated logical networks on a common physical network to meet the differentiated network performance requirements of different customers/businesses.

Software Defined Network (SDN), as an innovative network architecture, is a way to implement network virtualization. It realizes the separation of the forwarding plane and the control plane. Through a centralized controller, the topology and service quality requirements of network slices are dynamically configured and adjusted to meet the needs of different application scenarios.

In order to solve the problem that the NDN network in the related art cannot meet the differentiated requirements of different types of services for network performance, the embodiment of the present application proposes an NDN network slicing method based on an SDN controller. The method embodiment provided in this embodiment can be executed in a terminal, a computer or a similar computing device. For example, running on a terminal, FIG1 is a hardware structure block diagram of a terminal of the NDN network slicing method based on an SDN controller in this embodiment. As shown in FIG1, the terminal may include one or more (only one is shown in FIG1) processors 102 and a memory 104 for storing data, wherein the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA. The above-mentioned terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It can be understood by those skilled in the art that the structure shown in FIG1 is only for illustration and does not limit the structure of the above-mentioned terminal. For example, the terminal may also include more or fewer components than those shown in FIG1, or have a different configuration than that shown in FIG1.

The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the NDN network slicing method based on the SDN controller in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

The transmission device 106 is used to receive or send data via a network. The above network includes a wireless network provided by a communication provider of the terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (Radio Frequency, RF) module, which is used to communicate with the Internet wirelessly.

The embodiment of the present application provides an NDN network slicing method based on an SDN controller, and takes the method applied to the terminal in FIG. 1 as an example for explanation. As shown in FIG. 2, the method includes the following steps:

S201, calculating slice paths of different metric characteristics of the NDN router, and obtaining a forwarding table of the slice paths.

Specifically, the SDN controller calculates slice paths (network slices) with different metric characteristics for the NDN router, including calculating the slice path for traffic with maximum bandwidth, calculating the slice path for traffic with minimum delay and guaranteed bandwidth, calculating the slice path for timely switching when a network failure occurs without interrupting the flow and without affecting other types of services, and calculating the slice path to meet the differentiated network performance requirements of other services.

S202: Send the forwarding table to the NDN router.

Specifically, the SDN controller sends the forwarding table of the slice paths with different metric characteristics calculated above to the NDN router, and the NDN router receives the forwarding table.

The above-mentioned SDN controller includes a topology management unit, a host service unit, an NDN management unit, a computing unit and a delivery unit. The topology management unit is responsible for collecting and maintaining the network topology map between NDN routers and completing link discovery through the BGP-LS protocol. The host service unit is used to obtain the location of the host in the global view, understand the users connected to the network by intercepting ARP, DHCP and other data packets, and then provide this information to the host service. The NDN management unit is used to maintain the producer's data table, including the host's MAC address, the hash value of the data packet content name, etc. The computing unit is used to calculate the NDN forwarding table matched by the slice path of different metric characteristics. The delivery unit is used to deliver the above forwarding table to the NDN router.

S203, based on the metric characteristics of the NDN message, select a corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message.

Specifically, the metric characteristics of NDN messages, that is, the differentiated requirements of business messages for network performance, include capabilities such as massive access, deterministic latency, and extremely high reliability. This application selects the corresponding slice path in the forwarding table sent by the SDN controller on the NDN router to route and forward the business message based on the metric characteristics required by the business message.

The NDN network of the present application includes multiple NDN routers, the NDN network is connected to the SDN controller, each NDN routing node is connected to the SDN controller, the SDN controller establishes a BGP-LS neighbor with the NDN router, the SDN controller calculates slice paths with different metric characteristics for the NDN router, and divides the paths, and then the SDN controller sends the forwarding table of the slice paths with different metric characteristics calculated above to the NDN router, and the SDN controller selects the corresponding slice path in the forwarding table on the NDN router according to the requirements of different business characteristics to route and forward the message, which solves the problem that the NDN network cannot meet the differentiated requirements of different types of services for network performance, and realizes the isolation of different business traffic in the NDN network, thereby meeting the requirements of different communication transmission business characteristics. At the same time, through the separation of the control plane and the forwarding plane of the SDN network, the SDN controller can centrally control and manage the entire NDN network, dynamically configure and flexibly schedule according to the requirements of network slicing to meet the characteristics of different network slices, and the data plane only needs to look up the table and forward, which improves the efficiency of NDN network slicing.

In one embodiment, calculating the slice paths of different metric characteristics of the NDN router and obtaining the forwarding table of the slice paths includes the following:

Collecting the named data link state routing protocol information and the network reachable layer information of the NDN router; calculating slice paths with different metric characteristics for the NDN router based on the named data link state routing protocol information and the network reachable layer information, and obtaining a forwarding table for the slice paths.

Specifically, the SDN controller and the NDN router establish an N-BGP peer relationship through the NBGP protocol and publish the route to the NDN router. As shown in Table 1, a new link state is added to the BGP-LS route, which is defined as the NDN topology prefix NLRI (Network Layer Reachability Information). The SDN controller obtains the network reachability layer information of the NDN router through the extended BGP-LS protocol. The NDN topology prefix NLRI protocol format is the same as the topology prefix NLRI of IPv4/IPv6. The NLRI type value is 5, the new protocol identifier (Protocol ID) value is 7, and the type is defined as "NLSR (Named Data Link State Routing Protocol)". Other protocol fields are the same as the topology prefix NLRI of IPv4/IPv6, such as identifier, local node descriptors, and prefix descriptors. The NDN topology prefix NLRI protocol message format is shown in Figure 3. Furthermore, the SDN controller collects the NLSR information of the NDN router through BGP-LS. The present application calculates slice paths with different metric characteristics for the NDN router based on the named data link state routing protocol information and the network reachability layer information, and obtains a forwarding table for the slice path.

Table 1

In one of the embodiments, based on the metric characteristics of the NDN message, selecting the corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message includes the following:

S301, adding a slice identifier to the NDN interest packet to identify the metric characteristics of the NDN message.

The two types of messages in the NDN network are NDN interest packets and NDN data packets. The communication of NDN can be divided into two processes: interest packet sending and data packet returning. The embodiment of the present application extends the interest packet of NDN, adds the SI field (Slice Information), and the packet format of the NDN interest packet after the extension is shown in Figure 4. Among them, the SI field carries a slice identifier (Slice ID), which is used to identify the requirements for network performance when the NDN message is routed and forwarded. By introducing the slice identifier in the data plane, the logical node in the network slice is uniquely identified, and the service message is specified through which network slice to carry. Each slice identifier corresponds to a network slice.

S302: Based on the slice identifier in the NDN interest packet, select a corresponding forwarding table on the NDN router to route and forward the NDN message.

Specifically, based on the slice identifier in the NDN interest packet, it can be determined through which network slice the message needs to be forwarded, and then the corresponding forwarding table is selected on the NDN router to route and forward the NDN message.

In one embodiment, before selecting a corresponding forwarding table on the NDN router to route and forward the NDN message, the following steps are included:

S401, determine whether the NDN message requires network slicing.

S402: If yes, based on the slice identifier in the NDN interest packet, a corresponding forwarding table is selected on the NDN router to route and forward the NDN message.

S403: If not, the NDN message is routed and forwarded according to the local routing forwarding table of the NDN router.

This embodiment determines whether the NDN message requires network slicing before selecting the corresponding forwarding table on the NDN router to route and forward the NDN message. Specifically, the SI field length is 33 bits, the first 1 bit is used to indicate whether network slicing is required, and the last 32 bits are the slice identifier length. If the first position of the SI field is 1, it means that the message forwarding must be forwarded from the network slice channel corresponding to the slice identifier. If the network slice channel does not exist at this time, the message is discarded; if the first position of the SI field is 0, check whether there is a network slice channel corresponding to the slice identifier. If it exists, the service is forwarded according to the corresponding network slice channel. If it does not exist, the message is not discarded, and the NDN message is routed and forwarded according to the local routing and forwarding table of the NDN router.

In one of the embodiments, the forwarding table sent by the SDN controller includes a forwarding information table (Forwarding Information Base, FIB) and a slice identifier mapping table of the slice interface; the forwarding information table is used to determine the three-layer outbound interface according to the request content name of the NDN interest packet, and the slice identifier mapping table is used to determine the reserved resources (which may be a sub-interface or a channel) under the three-layer outbound interface according to the slice identifier of the NDN interest packet.

In one embodiment, routing and forwarding the NDN message according to the corresponding forwarding table includes the following contents:

The content cache table (ContentStore, CS) of the intermediate routing node is queried according to the requested content name of the NDN interest packet. If the query is successful, the matching NDN data packet is returned from the resource reservation channel and the NDN interest packet is discarded;

If no matching NDN data packet is found in the content cache table, a pending interest table (PIT) is queried according to the request content name of the NDN interest packet. If the query is successful, the resource reservation channel information of the NDN interest packet of the node is recorded in the pending interest table, and the NDN interest packet is discarded;

If the query in the content cache table and the pending interest table is unsuccessful, the forwarding table sent by the SDN controller is queried. The specific process is: query the three-layer output interface in the forwarding information table (FIB table) according to the requested content name, and query the slice identifier mapping table according to the slice identifier in the NDN interest packet, determine the reserved resources under the three-layer output interface, and forward the NDN interest packet from the reserved resources to other routing nodes.

In one of the embodiments, the process of routing and forwarding the NDN message according to the corresponding forwarding table also includes: if the query of the forwarding information table according to the request content name fails or the query of the slice identifier mapping table according to the slice identifier in the NDN interest packet fails, then the NDN interest packet is discarded.

FIG5 is a flow chart of the NDN message forwarding process according to an embodiment of the present application, and the specific implementation steps are as follows:

S501, the consumer host sends an NDN interest packet.

S502, judging whether to perform slicing according to the SI field of the above NDN interest packet, if the first position of the SI field is 1, executing S503; if the first position of the SI field is 0, forwarding it as a normal NDN message.

S503, determine whether the network slice channel corresponding to the slice identifier exists. If so, execute 504; if not, discard the NDN interest packet.

S504, determine whether the CS table query data packet is successful. If successful, forward the matching NDN data packet from the resource reservation channel and discard the NDN interest packet. If unsuccessful, execute S505.

Specifically, the CS table of the intermediate routing node is queried. If a corresponding NDN data packet is found in the CS table according to the longest common prefix matching algorithm of the data name, the NDN data packet is returned from the resource reservation channel, and then the above NDN interest packet is discarded.

S505, determine whether the query of the PIT table is successful. If successful, record the resource reservation channel information into the PIT table and discard the above NDN interest packet; if unsuccessful, execute S506.

Specifically, the PIT table is queried according to the longest common prefix matching algorithm. If a match is found in the PIT table, it means that the routing node has previously forwarded the NDN interest packet of the same request, but has not yet obtained a return result. In this case, the resource reservation channel information of the interest packet of the node is recorded in the PIT table and then discarded. When the corresponding content request NDN data packet returns, the routing node sends the NDN data packet to the resource reservation channel according to the PIT table, and stores the data in the CS table to serve the needs of other subsequent nodes, and deletes the corresponding content name PIT table entry.

S506, determine whether the query of the FIB table is successful, if successful, execute S507; if unsuccessful, discard the above NDN interest packet.

Specifically, if no matching NDN data packet is found in the CS table and the PIT table, it means that the request content is processed by the router for the first time, and then it is necessary to search in the FIB table and find the next-hop out interface of the third layer according to the corresponding content name in the FIB table.

S507, determine whether the query of the slice identifier mapping table is successful. If successful, forward the above NDN interest packet from the corresponding forwarding channel of the mapping table, and record the channel information to the PIT table; if unsuccessful, discard the above interest packet.

Specifically, the slice identifier mapping table is queried according to the slice identifier of the SI field in the NDN interest packet, the resource reservation sub-interface or channel under the above-mentioned output interface is determined, and finally the corresponding resource reservation sub-interface or channel is used to forward the above-mentioned NDN interest packet to other routing nodes, and the corresponding content name PIT table entry is modified to indicate that the same content request indicates that the interest packet of the content name is being requested to be resolved.

It should be noted that the steps shown in the above process or the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

This embodiment provides an NDN network slicing device based on an SDN controller, as shown in FIG6 , the device includes:

A calculation module 610, configured to calculate slice paths of different metric characteristics for the NDN router, and obtain a forwarding table of the slice paths;

A sending module 620, configured to send the forwarding table to the NDN router;

The forwarding module 630 is used to select a corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message based on the metric characteristics of the NDN message.

In one embodiment, the calculation module 610 is further configured to:

Collecting named data link state routing protocol information and network reachability layer information of the NDN router;

Based on the named data link state routing protocol information and the network reachability layer information, slice paths with different metric characteristics are calculated for the NDN router to obtain a forwarding table of the slice paths.

In one embodiment, the forwarding module 630 is further configured to:

Add a slice identifier to the NDN interest packet to identify the metric characteristics of the NDN message;

Based on the slice identifier in the NDN interest packet, a corresponding forwarding table is selected on the NDN router to route and forward the NDN message.

In one embodiment, the forwarding module 630 is further configured to:

Determine whether the NDN message requires network slicing;

If yes, based on the slice identifier in the NDN interest packet, select a corresponding forwarding table on the NDN router to route and forward the NDN message;

If not, the NDN message is routed and forwarded according to the local routing forwarding table of the NDN router.

In one of the embodiments, the forwarding table includes a forwarding information table and a slice identifier mapping table of a slice interface; the forwarding information table is used to determine a layer-3 output interface according to a request content name of the NDN interest packet, and the slice identifier mapping table is used to determine reserved resources under the layer-3 output interface according to a slice identifier of the NDN interest packet.

In one embodiment, the forwarding module 630 is further configured to:

Query the content cache table of the intermediate routing node according to the requested content name of the NDN Interest packet. If the query is successful, return the matching NDN data packet from the resource reservation channel and discard the NDN Interest packet.

If no matching NDN data packet is found in the content cache table, query the pending interest table according to the request content name of the NDN interest packet. If the query is successful, record the resource reservation channel information of the NDN interest packet of the node into the pending interest table and discard the NDN interest packet.

If the query in the content cache table and the pending interest table is unsuccessful, the three-layer output interface is queried in the forwarding information table according to the requested content name, and the slice identifier mapping table is queried according to the slice identifier in the NDN interest packet to determine the reserved resources under the three-layer output interface, and the NDN interest packet is forwarded from the reserved resources to other routing nodes.

In one embodiment, the forwarding module 630 is further configured to:

If the query of the forwarding information table according to the request content name fails or the query of the slice identifier mapping table according to the slice identifier in the NDN interest packet fails, the NDN interest packet is discarded.

It should be noted that the above modules can be functional modules or program modules, and can be implemented by software or hardware. For modules implemented by hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be shown in FIG7. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing 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 and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, an NDN network slicing method based on an SDN controller is implemented. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covered on the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

Those skilled in the art will understand that the structure shown in FIG. 7 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in any one of the above-mentioned NDN network slicing method embodiments based on the SDN controller are implemented.

Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims (8)

1. A method for NDN network slicing based on an SDN controller, wherein the SDN controller establishes a BGP-LS neighbor relationship with an NDN router, wherein the method comprises: Calculating slice paths of different metric characteristics of the NDN router to obtain a forwarding table of the slice path; including: collecting named data link state routing protocol information and network reachability layer information of the NDN router; calculating slice paths of different metric characteristics for the NDN router based on the named data link state routing protocol information and the network reachability layer information to obtain a forwarding table of the slice path; Sending the forwarding table to the NDN router; Based on the metric characteristics of the NDN message, the NDN router selects the corresponding slice path in the forwarding table to route and forward the NDN message, wherein the NDN message includes an NDN interest packet, and the NDN interest packet has a slice identifier for identifying the metric characteristics of the NDN message and the logical nodes in the network slice, and the forwarding table includes a forwarding information table and a slice identifier mapping table of the slice interface; the forwarding information table is used to determine the three-layer output interface according to the request content name of the NDN interest packet, and the slice identifier mapping table is used to determine the reserved resources under the three-layer output interface according to the slice identifier of the NDN interest packet. 2. The method according to claim 1, characterized in that the NDN message includes an NDN interest packet, and the selecting, based on the metric characteristics of the NDN message, a corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message comprises: Adding a slice identifier to the NDN interest packet to identify the metric characteristics of the NDN message; Based on the slice identifier in the NDN interest packet, a corresponding forwarding table is selected on the NDN router to route and forward the NDN message. 3. The method according to claim 2, characterized in that before selecting the corresponding forwarding table on the NDN router to route and forward the NDN message, it includes: Determine whether the NDN message requires network slicing; If yes, based on the slice identifier in the NDN interest packet, select a corresponding forwarding table on the NDN router to route and forward the NDN message; If not, the NDN message is routed and forwarded according to the local routing forwarding table of the NDN router. 4. The method according to claim 3, wherein routing and forwarding the NDN message according to the corresponding forwarding table comprises: Query the content cache table of the intermediate routing node according to the requested content name of the NDN Interest packet. If the query is successful, return the matching NDN data packet from the resource reservation channel and discard the NDN Interest packet. If no matching NDN data packet is found in the content cache table, query the pending interest table according to the request content name of the NDN interest packet. If the query is successful, record the resource reservation channel information of the NDN interest packet of the node into the pending interest table and discard the NDN interest packet. If the query in the content cache table and the pending interest table is unsuccessful, the three-layer output interface is queried in the forwarding information table according to the requested content name, and the slice identifier mapping table is queried according to the slice identifier in the NDN interest packet to determine the reserved resources under the three-layer output interface, and the NDN interest packet is forwarded from the reserved resources to other routing nodes. 5. The method according to claim 4, characterized in that the method further comprises: If the query of the forwarding information table according to the request content name fails or the query of the slice identifier mapping table according to the slice identifier in the NDN interest packet fails, the NDN interest packet is discarded. 6. An NDN network slicing device based on an SDN controller, wherein the SDN controller establishes a BGP-LS neighbor relationship with an NDN router, wherein the device comprises: A calculation module, used to calculate slice paths of different metric characteristics of the NDN router, and obtain a forwarding table of the slice path; including: collecting named data link state routing protocol information and network reachability layer information of the NDN router; based on the named data link state routing protocol information and the network reachability layer information, calculating slice paths of different metric characteristics for the NDN router, and obtaining a forwarding table of the slice path; A sending module, used for sending the forwarding table to the NDN router; A forwarding module, used for selecting the corresponding slice path in the forwarding table on the NDN router to route and forward the NDN message based on the metric characteristics of the NDN message, wherein the NDN message includes an NDN interest packet, and the NDN interest packet has a slice identifier for identifying the metric characteristics of the NDN message and the logical nodes in the network slice, and the forwarding table includes a forwarding information table and a slice identifier mapping table of the slice interface; the forwarding information table is used to determine the three-layer output interface according to the request content name of the NDN interest packet, and the slice identifier mapping table is used to determine the reserved resources under the three-layer output interface according to the slice identifier of the NDN interest packet. 7. A computer device, comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the method according to any one of claims 1 to 5 when executing the computer program. 8. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.