CN117955908A - NDN network slicing method, device, equipment and medium based on SDN controller - Google Patents
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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
Technical Field
The present application relates to the field of network transmission technologies, and in particular, to an NDN network slicing method, apparatus, device, and medium based on an SDN controller.
Background
The named data Networking (NAMED DATA Networking, NDN) is a representative information center network solution, which completely discards address-based communication modes, adopts a content-based mode to naturally support content caching and multicasting characteristics, and has wide application prospects in the fields of video conferences, vehicle-mounted networks, video on demand, file transmission and the like.
The bandwidth and latency requirements of the network are quite different for different services. For example, video conferences have high requirements on network time delay and safety performance, high-definition map downloading in a vehicle-mounted network requires large bandwidth, and video-on-demand has requirements on network bandwidth and time delay. However, the NDN network does not distinguish service types in the network at the beginning of design, provides the same forwarding processing mode for different types of services, and ignores the differentiated requirements of different types of services on network performance, so that the end-to-end service support capability is not ideal, the service class protocol (SERVICE LEVEL AGREEMENT, SLA) of the service cannot be ensured, and the dynamic deployment and flexible adjustment of the service cannot be satisfied.
Aiming at the problem that the NDN network can not meet the differentiated requirements of different types of services on network performance in the related technology, no effective solution is proposed at present.
Disclosure of Invention
Based on this, it is necessary to provide an NDN network slicing method, device, equipment and medium based on an SDN controller in order to solve 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, where the SDN controller and an NDN router establish BGP-LS neighbors, and the method includes:
calculating slice paths with different measurement characteristics of the NDN router, and obtaining a forwarding table of the slice paths;
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.
In one embodiment, the 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 reachable layer information of the NDN router;
and 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 of the slice paths.
In one embodiment, the NDN packet includes an NDN interest packet, and selecting, on the NDN router, a corresponding slice path in the forwarding table to route and forward the NDN packet based on a metric characteristic of the NDN packet includes:
Adding slice identifiers to the NDN interest packets for identifying the measurement characteristics of the NDN messages;
And selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way based on the slice identifier in the NDN interest packet.
In one embodiment, before selecting a corresponding forwarding table on the NDN router to forward the NDN packet in a routing manner, the method includes:
Judging whether the NDN message needs to be routed and forwarded by a network slice;
if yes, selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way based on the slice identifier in the NDN interest packet;
If not, carrying out route forwarding on the NDN message according to the local route forwarding table of the NDN router.
In one embodiment, the forwarding table includes a forwarding information table and a slice identification mapping table of a slice interface; the forwarding information table is used for determining a three-layer outbound interface according to the request content name of the NDN interest packet, and the slice identification mapping table is used for determining reserved resources under the three-layer outbound interface according to the slice identification of the NDN interest packet.
In one embodiment, the routing forwarding the NDN packet according to the corresponding forwarding table includes:
Inquiring a content cache table of the intermediate routing node according to the request content name of the NDN interest packet, if the inquiry is successful, returning a matched NDN data packet from the resource reservation channel, and discarding the NDN interest packet;
If no matched NDN data packet is queried in the content cache table, querying a pending interest table according to the request content name of the NDN interest packet, if the query is successful, recording the resource reservation channel information of the NDN interest packet of the node into the pending interest table, and discarding the NDN interest packet;
If the content cache table and the pending interest table are not queried successfully, querying a three-layer outgoing interface in the forwarding information table according to the request content name, querying the slice identification mapping table according to slice identifications in the NDN interest packet, determining reserved resources under the three-layer outgoing interface, and forwarding the NDN interest packet from the reserved resources to other routing nodes.
In one embodiment, the method further comprises:
and if the forwarding information table is failed to be queried according to the request content name or the slice identification mapping table is failed to be queried according to the slice identification in the NDN interest packet, discarding the NDN interest packet.
In a second aspect, an embodiment of the present application further provides an NDN network slicing apparatus based on an SDN controller, where the SDN controller and an NDN router establish BGP-LS neighbors, and the apparatus includes:
the calculation module is used for calculating slice paths with different measurement characteristics for the NDN router and obtaining a forwarding table of the slice paths;
the issuing module is used for issuing the forwarding table to the NDN router;
And the forwarding module is used for selecting a corresponding slice path in the forwarding table on the NDN router to forward the NDN message in a routing way based on the measurement characteristic of the NDN message.
In a third aspect, embodiments of the present application also provide a computer device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the method according to the first aspect described above.
In a fourth aspect, embodiments of the present application further provide a computer readable storage medium, in which a computer program is stored, wherein the computer program, when executed by a processor, implements the method according to the first aspect.
According to the NDN network slicing method, device, equipment and medium based on the SDN controller, the SDN controller calculates slicing paths with different measurement characteristics for the NDN router to divide paths, then the SDN controller transmits the calculated forwarding tables of the slicing paths with different measurement characteristics to the NDN router, and the SDN controller selects the corresponding slicing paths in the forwarding tables on the NDN router to route and forward the message according to different service characteristic requirements, so that the problem that the NDN network cannot meet the differentiated requirements of different types of services on network performance is solved, isolation of different service flows in the NDN network is realized, and the requirements of different communication transmission service characteristics are met. Meanwhile, the SDN can centrally control and manage the whole NDN through the separation of the control surface and the forwarding surface, and is dynamically configured and flexibly scheduled according to the requirements of network slices so as to meet the characteristic requirements of different network slices, and the data plane only needs to look up and forward, so that the efficiency of the NDN network slices is improved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
Fig. 1 is a hardware block diagram of a terminal device of an NDN network slicing method based on an SDN controller in one embodiment;
FIG. 2 is a flow diagram of an NDN network slicing method based on an SDN controller in one embodiment;
FIG. 3 is a diagram illustrating an exemplary message format of an NDN topology prefix NLRI protocol;
FIG. 4 is a diagram of a packet format of an NDN extended interest packet in one embodiment;
FIG. 5 is a flow diagram of an NDN message forwarding process in one embodiment;
FIG. 6 is a block diagram of an NDN network slicing device based on an SDN controller in one embodiment;
FIG. 7 is a schematic diagram of a computer device architecture in one embodiment.
Detailed Description
The present application will be described and illustrated with reference to the accompanying drawings and examples in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided by the present application without making any inventive effort, are intended to fall within the scope of the present application.
Network slicing is a new network architecture that provides multiple logical networks on the same shared network infrastructure, each serving a particular business type or industry user. Through network slicing, operators can construct a plurality of special, virtualized and isolated logic networks on a common physical network to meet the differentiated requirements of different clients/services on network performance.
The software defined network (Software Defined Network, SDN) is used as an innovative network architecture, is an implementation mode of network virtualization, realizes separation of a forwarding plane and a control plane, dynamically configures and adjusts topology and service quality requirements of network slices through a centralized controller, and can meet requirements of different application scenes.
In order to solve the problem that an NDN network in the related art cannot meet the differentiated requirements of different types of services on network performance, an embodiment of the application provides an NDN network slicing method based on an SDN controller. The method embodiments provided in the present embodiment may be executed in a terminal, a computer, or similar computing device. For example, the method runs on a terminal, fig. 1 is a hardware block diagram of the terminal of the NDN network slicing method based on the SDN controller in this embodiment. As shown in fig. 1, the terminal may include one or more (only one is shown in fig. 1) processors 102 and a memory 104 for storing data, wherein the processors 102 may include, but are not limited to, a microprocessor MCU, a programmable logic device FPGA, or the like. The terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and is not intended to limit the structure of the terminal. For example, the terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.
The memory 104 may be used to store computer programs, such as software programs and modules of application software, such as a computer program corresponding to an NDN network slicing method based on an SDN controller in this embodiment, and the processor 102 executes the computer programs stored in the memory 104 to perform various functional applications and data processing, that is, implement the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used to receive or transmit data via a network. The 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) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module for communicating with the internet wirelessly.
The embodiment of the application provides an NDN network slicing method based on an SDN controller, which is illustrated by taking a terminal in FIG. 1 as an example, and as shown in FIG. 2, the method comprises the following steps:
s201, calculating slice paths with 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 a slice path of a traffic with a maximum bandwidth, calculating a slice path of a traffic with a minimum delay and a guaranteed bandwidth, and when a network failure occurs, timely switching slice paths that do not flow and do not affect other types of services, and in order to meet the requirements of other services on network performance differentiation.
S202, the forwarding table is issued to the NDN router.
Specifically, the SDN controller issues the calculated forwarding tables of the slice paths with different metric characteristics to the NDN router, and the NDN router receives the forwarding tables.
The SDN controller comprises a topology management unit, a host service unit, an NDN management unit, a calculation unit and a issuing unit. The topology management unit is responsible for collecting and maintaining network topology diagrams among the NDN routers, and link discovery is completed through the BGP-LS protocol. The host service unit is used for acquiring the position of the host in the global view, knowing the user connected to the network by intercepting ARP, DHCP and other data packets, and providing the information to the host service. The NDN management unit is configured to maintain a data table of the producer, including a MAC address of the host, a hash value of a content name of the data packet, and the like. The calculating unit is used for calculating NDN forwarding tables matched with slice paths with different metric characteristics. And the issuing unit is used for issuing the forwarding table to the NDN router.
S203, based on the measurement characteristics of the NDN message, selecting a corresponding slice path in the forwarding table on the NDN router to forward the NDN message in a routing way.
Specifically, the measurement characteristics of the NDN message, namely the differentiated requirements of the service message on network performance, including the capabilities of massive access, deterministic delay, extremely high reliability and the like, are selected on the NDN router according to the measurement characteristics required by the service message, and the service message is routed and forwarded by a corresponding slice path in a forwarding table issued by the SDN controller.
The NDN network comprises a plurality of NDN routers, the NDN network is connected with an SDN controller, each NDN routing node is connected with the SDN controller, the SDN controller and the NDN router establish BGP-LS neighbors, the SDN controller calculates slice paths with different measurement characteristics for the NDN router to divide the paths, then the SDN controller transmits forwarding tables of the calculated slice paths with different measurement characteristics to the NDN router, and the SDN controller selects the corresponding slice paths in the forwarding tables on the NDN router according to different service characteristic requirements to forward the messages in a routing way, so that the problem that the NDN network cannot meet the different requirements of different types of services on network performance is solved, the isolation of different service flows in the NDN network is realized, and the requirements of different communication transmission service characteristics are met. Meanwhile, the SDN network can centrally control and manage the whole NDN network through separation of the control surface and the forwarding surface, and is dynamically configured and flexibly scheduled according to the requirements of network slices so as to meet the characteristic requirements of different network slices, and the data plane only needs to look up and forward, so that the efficiency of the NDN network slices is improved.
In one embodiment, the 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 reachable layer information of the NDN router; and 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 of the slice paths.
Specifically, the SDN controller and the NDN router establish an N-BGP peer between NBGP protocols and issue routes to the NDN router. As shown in table 1, a link state is newly added to the BGP-LS route, which is defined as an NDN topology prefix NLRI (Network Layer Reachability Information ), and the SDN controller obtains 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 IPv4/IPv6 topology prefix NLRI, the NLRI type value is 5, the newly added Protocol identification (Protocol ID) value is 7, the type is defined as "NLSR (named data link state routing Protocol)", and other Protocol fields are the same as the IPv4/IPv6 topology prefix NLRI, such as an Identifier (Identifier), a local node descriptor (Local Node Descriptors), and a prefix descriptor (PrefixDescriptors). The message format of the NDN topology prefix NLRI protocol is shown in fig. 3. Further, the SDN controller collects NLSR information of the NDN router through BGP-LS, and the application calculates slice paths with different measurement characteristics for the NDN router based on the named data link state routing protocol information and the network reachable layer information to obtain a forwarding table of the slice paths.
TABLE 1
In one embodiment, the selecting, on the NDN router, a corresponding slice path in the forwarding table to route and forward the NDN message based on the metric characteristic of the NDN message includes:
S301, adding slice identification to the NDN interest packet, wherein the slice identification is used for identifying the measurement characteristic of the NDN message.
Two types of messages in the NDN network are an NDN Interest (Interest) packet and an NDN Data (Data) packet, and communication of the NDN can be divided into two processes of sending the Interest packet and transmitting the Data packet back. The embodiment of the application expands the interest packet of the NDN, adds SI fields (Slice Information ) and the packet format of the NDN interest packet after expansion is shown in figure 4. The SI field carries a Slice identifier (Slice ID) for identifying a requirement on network performance when the NDN packet is routed and forwarded, and the logical node in the network Slice is uniquely identified by introducing the Slice identifier into the data plane, which network Slice the service packet is carried through is specified, and each Slice identifier corresponds to one network Slice.
S302, based on the slice identification in the NDN interest packet, selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way.
Specifically, according to 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 forward the NDN message in a routing manner.
In one embodiment, before selecting a corresponding forwarding table on the NDN router to forward the NDN packet in a routing manner, the method includes the following steps:
s401, judging whether the NDN message needs network slicing.
And S402, if yes, selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way based on the slice identifier in the NDN interest packet.
S403, if not, carrying out route forwarding on the NDN message according to a local route forwarding table of the NDN router.
In this embodiment, before selecting a corresponding forwarding table on the NDN router to forward the NDN packet in a routing manner, whether the NDN packet needs a network slice is determined. Specifically, the SI field length is 33 bits, the first 1bit is used to indicate whether a network slice is needed, and the last 32 bits are the slice identification length. If the first position of the SI field is 1, the message forwarding is that the message forwarding is necessary to be forwarded from a network slice channel corresponding to the slice identifier, and if the network slice channel does not exist at the moment, the message is discarded; if the first position of the SI field is 0, searching whether a network slice channel corresponding to the slice identifier exists, if so, carrying out service forwarding according to the corresponding network slice channel, and if not, not discarding the message, and carrying out route forwarding on the NDN message according to a local route forwarding table of the NDN router.
In one embodiment, the forwarding table issued by the SDN controller includes a forwarding information table (Forwarding Information Base, FIB) and a slice identification mapping table of a slice interface; the forwarding information table is used for determining a three-layer outbound interface according to the request content name of the NDN interest packet, and the slice identification mapping table is used for determining reserved resources (which can be sub-interfaces or channels) under the three-layer outbound interface according to the slice identification of the NDN interest packet.
In one embodiment, the routing forwarding the NDN packet according to the corresponding forwarding table includes the following contents:
Inquiring a Content Cache (CS) table of an intermediate routing node according to the request Content name of the NDN interest packet, if the inquiry is successful, returning a matched NDN data packet from a resource reservation channel, and discarding the NDN interest packet;
If the matched NDN data packet is not queried in the content cache Table, querying a pending interest Table (PENDING INTEREST Table, PIT) according to the request content name of the NDN interest packet, if the query is successful, recording the resource reservation channel information of the NDN interest packet of the node into the pending interest Table, and discarding the NDN interest packet;
If the content cache table and the pending interest table are not queried successfully, querying a forwarding table issued by the SDN controller, wherein the specific process is as follows: inquiring a three-layer outbound interface in a forwarding information table (FIB table) according to the request content name, inquiring the slice identification mapping table according to slice identifications in the NDN interest packet, determining reserved resources under the three-layer outbound interface, and forwarding the NDN interest packet from the reserved resources to other routing nodes.
In one embodiment, the routing forwarding process of the NDN packet according to the corresponding forwarding table further includes: and if the forwarding information table is failed to be queried according to the request content name or the slice identification mapping table is failed to be queried according to the slice identification in the NDN interest packet, discarding the NDN interest packet.
Fig. 5 is a flowchart of an NDN message forwarding process according to an embodiment of the present application, which includes the following implementation steps:
s501, the consumer host sends an NDN interest packet.
S502, judging whether slicing is needed or not according to the SI field of the NDN interest packet, and executing S503 if the initial position of the SI field is 1; if the SI field head position is 0, forwarding according to the common NDN message.
S503, judging whether the network slice channel corresponding to the slice identifier exists, if so, executing 504, and if not, discarding the NDN interest packet.
S504, judging whether the CS table inquires whether the data packet is successful, if so, forwarding the matched NDN data packet from the resource reservation channel, discarding the NDN interest packet, and if not, executing S505.
Specifically, the CS table of the intermediate routing node is queried, if the NDN data packet with response in the CS table is queried according to the longest public prefix matching algorithm of the data name, the NDN data packet is returned from the resource reservation channel, and then the NDN interest packet is discarded.
S505, judging whether the PIT table is successfully queried, if so, recording the resource reservation channel information to the PIT table, and discarding the NDN interest packet; if not, S506 is performed.
Specifically, the PIT table is queried according to a name longest common prefix matching algorithm. If a matching item is found in the PIT table, the routing node forwards the NDN interest packet with the same request before, but a return result is not obtained yet, and 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 is returned, the routing node sends the NDN data packet to the resource reservation channel according to the PIT table, stores the data into the CS table to serve the requirements of other subsequent nodes, and deletes the corresponding content name PIT table entry.
S506, judging whether the query of the FIB table is successful, and if so, executing S507; if not, discarding the NDN interest packet.
Specifically, if no matching NDN packet is found in the CS table and the PIT table, which indicates that the request content is processed by the router for the first time, a lookup is required in the FIB table, and the next hop-out interface of the three layers is found according to the corresponding content name in the FIB table.
S507, judging whether the query slice identification mapping table is successful, if so, forwarding the NDN interest packet from a corresponding forwarding channel of the mapping table, and recording channel information to a PIT table; if not, discarding the interest packet.
Specifically, a slice identification mapping table is queried according to slice identifications of SI fields in NDN interest packets, a resource reservation sub-interface or channel under the outgoing interface is determined, and finally the NDN interest packets are forwarded to other routing nodes by using the corresponding resource reservation sub-interface or channel, and corresponding content name PIT table entries are modified to indicate that the interest packets with the same content request indication content name are in request resolution.
It should be noted that the steps illustrated in the above-described flow or flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flow diagrams, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein.
The embodiment provides an NDN network slicing device based on an SDN controller, as shown in fig. 6, the device includes:
a calculating module 610, configured to calculate slice paths with different metric characteristics for an NDN router, and obtain a forwarding table of the slice paths;
A transmitting module 620, configured to transmit the forwarding table to the NDN router;
And a forwarding module 630, configured to select, on the NDN router, a corresponding slice path in the forwarding table to route and forward the NDN packet based on the metric characteristic of the NDN packet.
In one embodiment, the computing module 610 is further to:
collecting named data link state routing protocol information and network reachable layer information of the NDN router;
and 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 of the slice paths.
In one embodiment, forwarding module 630 is further to:
Adding slice identification to the NDN interest packet for identifying the measurement characteristic of the NDN message;
And selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way based on the slice identifier in the NDN interest packet.
In one embodiment, forwarding module 630 is further to:
Judging whether the NDN message needs network slicing or not;
if yes, selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way based on the slice identifier in the NDN interest packet;
If not, carrying out route forwarding on the NDN message according to the local route forwarding table of the NDN router.
In one embodiment, the forwarding table includes a forwarding information table and a slice identification mapping table of a slice interface; the forwarding information table is used for determining a three-layer outbound interface according to the request content name of the NDN interest packet, and the slice identification mapping table is used for determining reserved resources under the three-layer outbound interface according to the slice identification of the NDN interest packet.
In one embodiment, forwarding module 630 is further to:
Inquiring a content cache table of the intermediate routing node according to the request content name of the NDN interest packet, if the inquiry is successful, returning a matched NDN data packet from the resource reservation channel, and discarding the NDN interest packet;
If no matched NDN data packet is queried in the content cache table, querying a pending interest table according to the request content name of the NDN interest packet, if the query is successful, recording the resource reservation channel information of the NDN interest packet of the node into the pending interest table, and discarding the NDN interest packet;
If the content cache table and the pending interest table are not queried successfully, querying a three-layer outgoing interface in the forwarding information table according to the request content name, querying the slice identification mapping table according to slice identifications in the NDN interest packet, determining reserved resources under the three-layer outgoing interface, and forwarding the NDN interest packet from the reserved resources to other routing nodes.
In one embodiment, forwarding module 630 is further to:
and if the forwarding information table is failed to be queried according to the request content name or the slice identification mapping table is failed to be queried according to the slice identification in the NDN interest packet, discarding the NDN interest packet.
The above-described respective modules may be functional modules or program modules, and may be implemented by software or hardware. For modules implemented in hardware, the various modules described above may be located in the same processor; or the above modules may be located in different processors in any combination.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured 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 computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program, when executed by a processor, implements an NDN network slicing method based on an SDN controller. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 7 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the 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, which when executed by a processor implements the steps of any of the above embodiments of an NDN network slicing method based on an SDN controller.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (RandomAccess Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. An NDN network slicing method based on an SDN controller, where the SDN controller and an NDN router establish BGP-LS neighbors, the method comprising:
calculating slice paths with different measurement characteristics of the NDN router, and obtaining a forwarding table of the slice paths;
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.
2. The method of claim 1, wherein the calculating the slice paths for the different metric characteristics of the NDN router, obtaining a forwarding table for the slice paths, comprises:
collecting named data link state routing protocol information and network reachable layer information of the NDN router;
and 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 of the slice paths.
3. The method of claim 1, wherein the NDN message comprises an NDN interest packet, and wherein selecting a corresponding slice path in the forwarding table on the NDN router to route the NDN message based on a metric characteristic of the NDN message comprises:
Adding slice identifiers to the NDN interest packets for identifying the measurement characteristics of the NDN messages;
And selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way based on the slice identifier in the NDN interest packet.
4. The method of claim 3, wherein before selecting a corresponding forwarding table on the NDN router to route the NDN message, the method comprises:
Judging whether the NDN message needs network slicing or not;
if yes, selecting a corresponding forwarding table on the NDN router to forward the NDN message in a routing way based on the slice identifier in the NDN interest packet;
If not, carrying out route forwarding on the NDN message according to the local route forwarding table of the NDN router.
5. A method according to claim 3, wherein the forwarding table comprises a forwarding information table and a slice identification mapping table of a slice interface; the forwarding information table is used for determining a three-layer outbound interface according to the request content name of the NDN interest packet, and the slice identification mapping table is used for determining reserved resources under the three-layer outbound interface according to the slice identification of the NDN interest packet.
6. The method of claim 5, wherein routing the NDN message according to the corresponding forwarding table comprises:
Inquiring a content cache table of the intermediate routing node according to the request content name of the NDN interest packet, if the inquiry is successful, returning a matched NDN data packet from the resource reservation channel, and discarding the NDN interest packet;
If no matched NDN data packet is queried in the content cache table, querying a pending interest table according to the request content name of the NDN interest packet, if the query is successful, recording the resource reservation channel information of the NDN interest packet of the node into the pending interest table, and discarding the NDN interest packet;
If the content cache table and the pending interest table are not queried successfully, querying a three-layer outgoing interface in the forwarding information table according to the request content name, querying the slice identification mapping table according to slice identifications in the NDN interest packet, determining reserved resources under the three-layer outgoing interface, and forwarding the NDN interest packet from the reserved resources to other routing nodes.
7. The method of claim 6, wherein the method further comprises:
and if the forwarding information table is failed to be queried according to the request content name or the slice identification mapping table is failed to be queried according to the slice identification in the NDN interest packet, discarding the NDN interest packet.
8. An NDN network slicing apparatus based on an SDN controller, the SDN controller establishing BGP-LS neighbors with an NDN router, the apparatus comprising:
The calculation module is used for calculating slice paths with different measurement characteristics of the NDN router and obtaining a forwarding table of the slice paths;
the issuing module is used for issuing the forwarding table to the NDN router;
And the forwarding module is used for selecting a corresponding slice path in the forwarding table on the NDN router to forward the NDN message in a routing way based on the measurement characteristic of the NDN message.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the method of any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the method of any one of claims 1 to 7.
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