CN106101200A - Based on route and the Anycast method and system rewriteeing in a kind of NDN - Google Patents
Based on route and the Anycast method and system rewriteeing in a kind of NDN Download PDFInfo
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- CN106101200A CN106101200A CN201610390347.0A CN201610390347A CN106101200A CN 106101200 A CN106101200 A CN 106101200A CN 201610390347 A CN201610390347 A CN 201610390347A CN 106101200 A CN106101200 A CN 106101200A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/63—Routing a service request depending on the request content or context
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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Abstract
The invention discloses in a kind of NDN based on route and the Anycast method and system rewriteeing.The method includes: client sends the first request to network；First request is forwarded to the scheduler of certain server zone by intermediate router based on Anycast route；Scheduler selects one of bundle of services server according to the first preset strategy；First request is rewritten as the second request according to the agreement between scheduler and server by scheduler；Second request is transmitted to selected server by scheduler；Server returns the first response message to scheduler；First response message is rewritten as the second response message according to the agreement between scheduler and server by scheduler；Second response message is returned to client by scheduler.The method and system of the present invention can in NDN network diversified Anycast demand, do not destroy NDN content router forward engine forwarding logic.
Description
Technical field
The present invention relates to name data network (Named Data Networking, NDN) technical field, particularly relate to one
Plant in NDN based on route and the Anycast method and system rewriteeing.
Background technology
At present, based on the access to internet for the user transfers content obtaining to based on point-to-point communication.And it is traditional
TCP/IP network only transferring content, not perceived content, thus cause substantial amounts of redundant flow transmission on network.In order to solve
The content blast causing due to content obtaining, research circle proposes NDN network using content as center, it is achieved that content and ground
Location and the decoupling of sender and recipient, and provide ubiquitous built-in caching to meet user, to content, there is heavy-tailed feature
Asynchronous access.
There is the service that many has hundreds of millions on a large scale, such as Google, Facebook, wechat etc. in existing internet.This
A little services are usually constructed with one group of server or server cluster being physically distributed but providing same services.For a user, this
Class service substantially belongs to Anycast service.But, the transmission mode of existing NDN only provides the Anycast simply based on Anycast route
Mechanism, it is impossible to meet flexible and changeable Anycast demand.Therefore, it is necessary to propose a kind of NDN can meet appointing of diversified demand
Broadcast technology.
Content of the invention
The present invention solves above-mentioned technical problem, provide a kind of NDN based on route and the Anycast method and system rewriteeing, energy
Do not destroy CCN content router and forward the forwarding logic of engine.Described technical scheme is as follows:
On the one hand, the present invention proposes a kind of Anycast method based on route and rewriting for NDN, comprises the steps:
Client sends the first request to network；
First request is forwarded to the scheduler of certain server zone by intermediate router based on Anycast route；
Scheduler selects one of bundle of services server according to the first preset strategy；
First request is rewritten as the second request according to the agreement between scheduler and server by scheduler；
Second request is transmitted to selected server by scheduler；
Server returns the first response message to scheduler；
First response message is rewritten as the second response message according to the agreement between scheduler and server by scheduler；
Second response message is returned to client by scheduler.
Further, the Service name of described first request is an Anycast service name；The scheduler of each server zone
To this Anycast service name of network notifications；First request is forwarded to several by intermediate router by the Anycast routing mechanism of NDN
The scheduler of some server zone in server zone.
Further, described second request includes the mark that can identify selected server.
Further, the entitled Anycast service identical with the Service name of the first request of the service of described second response message
Name, the reverse path hop-by-hop that the second response message is forwarded by the first request message returns to client.
On the other hand, the present invention proposes in a kind of NDN based on route and the Anycast system rewriteeing, comprising:
Client: be used for generating and sending the first request, receive the second response message；
Scheduler: for network notifications Anycast service name or its prefix, reception the first request, foundation the first policy selection
Server, first request that rewrites are the second request, forward second to ask, receive the first response message, rewrite the first response message
It is the second response message, forward the second response message；
Server: for receiving the second request, generating and send the first response message；
Intermediate router: for setting up according to the regular of NDN and updating route forwarding table, forward first to ask according to fib table
Seek message, return the second response message according to PIT table.
The present invention uses above technical scheme compared with prior art, has following technical effect that
By the present invention, diversified Anycast demand can be supported in NDN, particularly can effectively solve scaling concern,
Server can be selected according to server state neatly.In addition, technology proposed by the invention does not destroy NDN content router
Forward the forwarding logic of engine.
Aspect and advantage that the present invention adds will part be given in the following description, and these will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description
Fig. 1 shows the Anycast service scene schematic diagram according to an embodiment of the present invention.
Fig. 2 shows in the NDN according to an embodiment of the present invention based on route and the Anycast method flow diagram rewriteeing.
Fig. 3 shows that in the NDN according to an embodiment of the present invention, the entity based on route and the Anycast method rewriteeing is handed over
Figure mutually.
Fig. 4 shows in the NDN according to an embodiment of the present invention based on route and the Anycast system deployment signal rewriteeing
Figure.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of described embodiment is shown in the drawings, wherein ad initio
To the element that same or similar label represents same or similar element or has same or like function eventually.Below by ginseng
The embodiment examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative used herein " ", "
Individual ", " described " and " being somebody's turn to do " may also comprise plural form.It is to be further understood that use in the specification of the present invention arranges
Diction " including " refers to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existence or adds
Other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that when we claim unit
Part is " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or also can exist
Intermediary element.Additionally, " connection " used herein or " coupling " can include wireless connection or couple.Wording used herein
"and/or" includes one or more any cell listing item being associated and whole combination.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (include technology art
Language and scientific terminology) there is the meaning identical with the general understanding of the those of ordinary skill in art of the present invention.Also should
Being understood by, those terms defined in such as general dictionary should be understood that the meaning having with the context of prior art
The consistent meaning of justice, and unless defined as here, will not be explained by idealization or excessively formal implication.
Fig. 1 shows the Anycast scene schematic diagram according to an embodiment of the present invention.In figure, large-scale service is by many
The individual server zone being geographically spread out is to provide service.These M server zone Site 1, Site being geographically spread out
2 ..., Site M is connected by network.Each Site has multiple server, and such as Site k includes NkIndividual server.Each
Server all provides identical service.The client desiring access to service sends service request by network, finally by certain clothes
One of business device group server service request.Connect client and the network of each server zone is NDN network.
The NDN that the present invention proposes introduces this entity of scheduler based on route and the Anycast method rewriteeing, such as Fig. 3 institute
Show.Each server zone has a scheduler, is used for selecting one of server zone server.Scheduler generally and certain
Server zone is positioned at same network, as the shop front of server zone.
Fig. 2 shows in the NDN according to an embodiment of the present invention based on route and the Anycast method flow diagram rewriteeing.Tool
Body comprises the steps:
1) client sends the first request to network.
The Virtual Service name of the entitled described service of service in the first request that client sends, such as/foo.com/
generic-service-name。
So that the scheduler of certain server zone can be forwarded to the request of above-mentioned Service name prefix, each service
The scheduler of device group needs to notice to the route system of NDN with the route bar of the entitled prefix of Virtual Service of described service after deployment
Mesh, i.e./foo.com/generic-service-name.Alternatively, scheduler can be by the route entry be polymerized to route
System is noticed, such as/foo.com.Described route entry notice message spreads to the router of NDN network through Routing Protocol carrying,
And inject route forwarding table FIB.Substantially, this route entry is an Anycast route entry, and intermediate router is assisted by route
View calculates the suitable forwarding port reaching certain scheduler.
2) the first request is forwarded to the scheduler of certain server zone by intermediate router based on Anycast route.
After receiving the first request, intermediate router is according to the suitable port of forwarding entry coupling in FIB, by its hop-by-hop
It is forwarded to the scheduler of certain server zone.Owing to the scheduler of multiple server zones all have advertised identical route entry, because of
This, the request to same services that different clients sends may be forwarded to the scheduler of different server zones, and
Identical client is likely to be forwarded to different server zones in the request to same services not sent in the same time
Scheduler.Therefore, under the mechanism based on Anycast service, it is difficult to support the Anycast based on stream.
3) scheduler selects one of bundle of services server according to the first preset strategy.
After the first request has been forwarded to the scheduler of certain server zone according to Anycast route, scheduler is according to first
Preset strategy selects the server of first class services request.To this end, scheduler at least needs to configure the service of the server zone at place
Device information.Server can also periodically or Real-time Feedback be to scheduler by the state of self, in order to it carries out more complicated request
Scheduling.Scheduler can use simple randomized policy to randomly choose a server service first and ask, it would however also be possible to employ wheel
Turn strategy and make requests on scheduling, can also make requests on according to the state (such as real time load, residue service ability etc.) of server
Scheduling.The first preset strategy that scheduler is used by the present invention is not any limitation as.
4) the first request is rewritten as the second request according to the agreement between scheduler and server by scheduler.
After determining the server of first class services request, the first request is then rewritten as the second request by scheduler, and remembers
Record this rewriting behavior lower.The rewriting that scheduler makes requests on according to the agreement run between scheduler and server, scheduler needs
Want based on described agreement, revised second request can be transmitted to selected server.For example, if scheduler kimonos
Business device between support NDN agreement, then can will request Service name be rewritten as server rely on request Service name, for example/
server-ID/foo.com/generic-service-name.Wherein server-ID is the mark of selected server.Again
As if run between scheduler and server is ICP/IP protocol, then scheduler can build an IP message, its seedbed
Location is the IP address of scheduler, and destination address is the IP address of selected server, simultaneously according to Service name generic-
Service-name determines the port numbers of service, and destination interface is set to corresponding port numbers, and other in request name
Out of Memory in parameter information and request body is rewritten according to the consensus standard being run and is encapsulated.In the process rewritten
In, it is possible to need to perform recalculating of message integrity, the calculating of such as IP message checksum.The present invention is to scheduling
The agreement and the corresponding rewriting rule that run between device and server are not any limitation as.
5) the second request is transmitted to selected server by scheduler.
After scheduler asks successfully to be rewritten as the second request by first, the second request is given selected based on protocol forward
Server, meanwhile, scheduler is recorded this rewriting behavior.Described rewriting record behavior at least to include the first request
Service name and the mapping relations of mark of the second request, in order to can be successfully according to should when scheduler continues response upon receipt
Mapping relations perform the reverse rewriting of response message.
6) server is to scheduler dispatches the first response message.
After server receives the second request, service this request, and construct the first response message.This first response message with
The protocol format running between server and scheduler builds, and based on this protocol forward to scheduler.For example, if scheduler
And between server run be NDN agreement, then the Service name of this first response message is /server-ID/foo.com/
Generic-service-name, and return to scheduler along the second reverse path asked.And for example, if scheduler kimonos
Run between business device is IP agreement, then the destination address of the first response message and destination interface are the source address of the second request
And source port, this first response is forwarded to scheduler by IP agreement.
7) the first response message is rewritten as the second response message according to the agreement between scheduler and server by scheduler.
After scheduler receives the first response message, by the rewriting behavior record according to the first request, the first response is disappeared
Breath is rewritten as the second response message.For example, if run between scheduler and server is NDN agreement, then respond first
Service name/the server-ID/foo.com/generic-service-name of message is rewritten as/foo.com/generic-
service-name.When rewriting, scheduler it may also be desirable to update information signature and key information simultaneously.And if scheduler
With run between server is IP agreement, first obtain the identification information of the first response message message, including < source address, mesh
Address, source port, destination interface >, accordingly construct second request identification information, then according to first request Service name and
The identification information of the second request is rewritten into the second response message.When performing to rewrite, except carrying out protocol conversion, scheduler
Also need to arrange the key information of packet and information signature information.
8) the second response message is returned to client by scheduler.
After scheduler Successful construct the second response message, by the second response message along the forward-path of the first request
Reverse path returns to client.
Fig. 3 shows that in the NDN according to an embodiment of the present invention, the entity based on route and the Anycast method rewriteeing is handed over
Figure mutually.Wherein, eight steps in the corresponding diagram 2 respectively of step (1)-(8).
Fig. 4 shows in the NDN according to an embodiment of the present invention based on route and the Anycast system deployment signal rewriteeing
Figure, comprising:
Client: for generating and sending the first request to network, the scheduler receiving a certain server zone from network returns
The second response message returning；
Scheduler: be positioned at the front of each server zone, for network notifications Anycast service name or its prefix, receives the
One request, according to the first policy selection server, rewriteeing the first request according to the agreement run between scheduler and server is
Second request, asks based on the protocol forward second running between scheduler and server, receives the first sound that server returns
Answering message, rewriteeing the first response message according to the agreement run between scheduler and server is the second response message, along the
The port that one request reaches returns the second response message；
Server: for receiving the second request, generate the first response message, returns the first response to corresponding scheduler and disappears
Breath；
Intermediate router: for setting up according to the regular of NDN and updating route forwarding table, forward first to ask according to fib table
Seek message, ask the reverse path of message forward-path to return the second response message according to PIT table along first.
By technical scheme proposed by the invention, diversified Anycast demand can be met in NDN network.And this energy
The offer of power does not change the content naming rule of the NDN network architecture and NDN forwards the process logic of engine.
Those skilled in the art of the present technique are appreciated that the present invention can relate to perform in operation described herein
The equipment of one or more operation.Described equipment can specialized designs and manufacture for required purpose, or also can include
Known device in all-purpose computer, described all-purpose computer activates or reconstructs with having storage procedure Selection within it.This
The computer program of sample can be stored in equipment (for example, computer) computer-readable recording medium or be stored in be suitable to storage electronics refer to
Order is simultaneously coupled in any kind of medium of bus respectively, and described computer-readable medium is including but not limited to any kind of
Dish (including floppy disk, hard disk, CD, CD ROM and magneto-optic disk), immediately memory (RAM), read-only storage (ROM), electricity can be compiled
Journey ROM, electrically erasable ROM (EPROM), electrically erasable ROM (EEPROM), flash memory, magnetic card or light card.Readable
Medium includes for be stored by the readable form of equipment (for example, computer) or to be transmitted any mechanism of information.For example, readable
Medium include immediately memory (RAM), read-only storage (ROM), magnetic disk storage medium, optical storage medium, flash memory device, with
The signal (such as carrier wave, infrared signal, data signal) etc. that electricity, or other form is propagated.
Those skilled in the art of the present technique be appreciated that can with computer program instructions realize these structure charts and/or
The combination of the frame in each frame in block diagram and/or flow graph and these structure charts and/or block diagram and/or flow graph.Can be by this
The processor that a little computer program instructions are supplied to all-purpose computer, special purpose computer or other programmable data processing methods comes
Generate machine, thus the instruction being performed by the processor of computer or other programmable data processing methods create for
The method realizing specifying in the frame of structure chart and/or block diagram and/or flow graph or multiple frame.
Those skilled in the art of the present technique be appreciated that the various operations having discussed in the present invention, method, in flow process
Step, measure, scheme can be replaced, changed, combined or deleted.Further, there is discussed in the present invention each
Kind of operation, method, other steps in flow process, measure, scheme also can be replaced, changed, reset, decomposed, combined or deleted.
Further, of the prior art have and the step in the various operations disclosed in the present invention, method, flow process, measure, scheme
Also can be replaced, changed, reset, decomposed, combined or deleted.
The above is only the some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1., based on route and the Anycast method rewriteeing in NDN, comprise the steps:
Client sends the first request to network；
First request is forwarded to the scheduler of certain server zone by intermediate router based on Anycast route；
Scheduler selects one of bundle of services server according to the first preset strategy；
First request is rewritten as the second request according to the agreement between scheduler and server by scheduler；
Second request is transmitted to selected server by scheduler；
Server returns the first response message to scheduler；
First response message is rewritten as the second response message according to the agreement between scheduler and server by scheduler；
Second response message is returned to client by scheduler.
2. the method for claim 1, it is characterised in that described first request:
The Service name of the first request is an Anycast service name；
The scheduler of each server zone is to this Anycast service name of network notifications；
Some clothes that first request is forwarded in several server zones by the Anycast routing mechanism of NDN by intermediate router
The scheduler of business device group.
3. the method for claim 1, it is characterised in that the first request is rewritten as the second request by described scheduler:
Second request includes the mark that can identify selected server.
4. the method for claim 1, it is characterised in that the first response message is rewritten as the second response by described scheduler
Message:
The entitled Anycast service name identical with the Service name of the first request of service of the second response message.
5. the method for claim 1, it is characterised in that the second response message is returned to client by described scheduler:
The reverse path hop-by-hop that described second response message is forwarded by the first request message returns to client.
6. based on route and the Anycast system rewriteeing in a NDN, comprising:
Client, is used for generating and sending the first request, receives the second response message；
Scheduler, for network notifications Anycast service name or its prefix, reception the first request, foundation the first policy selection service
Device, first request that rewrites be the second request, forward the second request, receive the first response message, to rewrite the first response message be the
Two response messages, forward the second response message；
Server, for receiving the second request, generating and send the first response message；
Intermediate router, for setting up according to the rule of NDN and updating route forwarding table, forwards the first request to disappear according to fib table
Breath, returns the second response message according to PIT table.
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| CN108234325A (en) * | 2018-01-10 | 2018-06-29 | 北京知道创宇信息技术有限公司 | System and message forwarding method based on IP Anycasts |
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