CN104811393A - Multicasting message duplicating handling method and device and open flow controller (OFC) - Google Patents
Multicasting message duplicating handling method and device and open flow controller (OFC) Download PDFInfo
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Abstract
The invention provides a multicasting message duplicating handling method and device and an open flow controller (OFC). The method is applied to the SDN. The method comprises the steps of acquiring a link connection topological graph of an OFSW (open flow switch) in the SDN from the OFC; determining flow table articles and group table articles of the OFSW to handle the messages in a multicasting group according to the link connection topological graph and the incidence relation to a terminal user and the multicasting group; distributing the determined flow table articles and group table articles to the OFSW; performing multicasting duplicating the multicasting group messages through the OFSW according to the flow table articles and group table articles. With the adoption of the method, the problems of bandwidth waste and small resource utilization caused by duplicating the multicasting messages for each user in the BNG in related technology can be solved; the multicasting duplicating is minimized; the bandwidth resource is saved; the jam is avoided.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of multicast message duplication method, device and open flows controller (OpenFlow Controller, referred to as OFC).
Background technology
Current Internet(the Internet based on TCP/IP) through the development of four more than ten years, obtain huge success, closely bound up with people, become one of work, the requisite infrastructure of studying and living.The Internet of TCP/IP formula, because of the division of labor and the organizational principle of " gateway/network equipment carries out simple process, host side/side is given in complicated process " at the beginning of its design, define current internet architecture present situation: the application layer protocol of host computer side can be modified easily, neatly and dispose, therefore application layer software is by leaps and bounds developed, and therefore the function of application layer is enriched greatly, what form with it sharp contrast is network layer, although the design of network layer protocol is simple, but extensibility is not by force and not easily revise, cause: on the one hand, the many fatal leak that Internet aspect spills cruelly is difficult to be repaired and improve for a long time, as network management be difficult to dispose, network security problem is day by day serious, forwarding strategy that is that do one's best can not provide the service quality of user's request, multicast is difficult to dispose and application etc., on the other hand, New Deal, new opplication is difficult to accomplished owing to proposing to change requirement to network layer, as the difficulty from IPv4 to IPv6 transition, access device day by day presents ubiquitous mobility and challenges to network reliability and Differentiated Services ability with heterogeneous, in large scale network situation, route faces scalability problem, the application such as cloud computing and contents distribution proposes new demand to forwarded efficiency, the father Vinton G.Cerf of TCP/IP also points out should to do better in the Internet in network security and network reliability, and (" safety and reliability is the most basic two thresholds of Future Internet of marching toward, otherwise this framework cannot be survived ") etc.Therefore the Internet define at present one " application layer is flexible and changeable, a hundred flowers blossom, network layer stiff difficulty become, filled with flaws " difficult situation.The Internet will solve current institute's problems faced and difficult situation, needs to inquire into from the carrying out of the aspect such as network architecture, control profound level, study and reform, the opportunity that could comprehensively meet 21st century new and huge challenge.
For how solving current internet institute's problems faced and challenge, domestic and international research institution has carried out a large amount of positive exploration and research from internet architecture aspect.Mainly experienced by the development in two stages, can be divided into two class modes to the improvement of the Internet, evolved is improved and revolutionary improvement.
For many years, in quality of service guarantee, mobile support, high efficient and reliable and safety assurance etc., many problems are exposed for traditional IP, research field all adopts design to address these problems respectively with the mode of repairing targetedly, just improve immediately once the weakness or mistake that find the network run, such as in legacy interconnect network architecture, add new agreement and functional unit etc.The improved procedure of this " repair-> pinpoint the problems-> revise again " is based on existing the Internet TCP/IP architecture, progressively evolution and development are carried out to existing network, to add new function and characteristic solves current problems faced, be a kind of Evolution(evolved) improved procedure.The advantage of this improved procedure is to be easy to dispose and implement, and is conducive to the existing input protected in existing Internet Construction.But its defect is: (1) certain repairing just solves the problem of local among a small circle; (2) existing improvement may be introduced short-term yield and see have destructive as NAT, or local income has destructiveness to entirety for a long time; (3) certain repairing may be not easy " compatibility " following continuation amendment; (4) through repeatedly repairing, the Internet becomes more and more " thick and heavy ", complicated, dumb, beyond the ability to bear of simple architecture designing Internet originally; (5) some the intrinsic problems in legacy interconnect network architecture are difficult to the solution obtaining essence.At present or mainly gradually the Internet is improved in the mode of " evolution ".
2005 start, research field forms another kind of viewpoint gradually, only have redesign network architecture fundamentally could solve IP network institute problems faced, and current internet architecture " Clean-Slate " (starting from scratch) just carries out the inning of thoroughly change comprehensively, give up existing internet architecture completely, design a kind of completely newly, the next generation internet architecture that merges multiple design object.This scheme is intended to fundamentally to solve the various problems that existing internet architecture exists, and is that a kind of Revolution(is revolutionary) improvement project.The advantage of this scheme is: (1) can break away from the constraint of TPC/IP architecture, jumps out its constraint and framework, to solve the Internet for many years because of remaining challenges that architecture causes; (2) can carry out again, comprehensively designing to the Internet, the problems of overall solution the Internet, the realization of many new demands of overall arrangement the Internet.But the defect of this scheme is: (1) due to brand-new network may not compatible existing the Internet, need the infrastructure of replacing legacy network completely, the problem that therefore there is network design He seamlessly transit; (2) how to set up new architecture, and establish new architecture and whether can solve current and future network problems faced and also there is great risk; (3) need the experimental network rebuilding applicable brand-new architecture, evolution cost is high.
In order to solve current the Internet Problems existing, realize disposing fast, flexibly new procotol, open programmable network is suggested, open programmable network refers to and allows network research person and be not equipment vendors, carries out on network devices programming and manage its network architecture or procotol.Open programmable formula thinking is one of representative achievements of revolutionary improvement project, substantially may be summarized to be: by multiple functional networks original and deposit, overall, complicated MAN/WAN network or the network equipment carry out cutting by function, such as, be divided into data retransmission part and logic control part, or system core part and user function part etc.Interface between each several part is open with standard.Open and standardized interface based on this, each part can self-evolution and improvement and do not need notice or other parts of the another part of impact, and whole like this network or the network equipment also will realize independently, smooth evolution and improvement.Open programmable formula thinking facing challenges is: (1) network hierarchy needs to possess certain reasonability, science and extensibility; (2) interface of science, extendible point of interlayer is defined; (3) if control plane takes centralized management mode, then need to consider connection, extensibility (as expanding to the whole world) etc. between territory.
In the research of open programmable network, Berkeley(Berkeley) the SDN(Software Defined Networking that proposes of the people such as Scott Shenker of university, software defined network) technology, Stanford(Stamford) technology such as OpenFlow of university is the representative achievements of network opening Journal of Sex Research.The hierarchical model of SDN/OpenFlow technology comprises infrastructure layer, network control layer and application layer three levels.The infrastructure layer of SDN/OpenFlow network is made up of each forwarding unit, forwarding unit is more simple relative to structure the router in current network, switch and all kinds of gateway, do not have complicated Control Plane(chain of command), main work is the forwarding carrying out data flow.The capital equipment of network control layer is network operating system (or claiming SDN/OpenFlow controller), network operating system is controlled multiple stage forwarding unit by standardized interface simultaneously, instead of originally even current independent of the chain of command in individual device network management system, can realize network management and end to end data flow rule issue (namely to the multiple stage forwarding unit on forward-path issue stream rule), network operating system is by API(Application Programming Interface simultaneously, application programming interface) mutual with application layer.Application layer is made up of different application, applies network management and the controlling functions that directly can be called key-course by api interface.
In SDN/OpenFlow network, undertaken (as OpenFlow agreement) alternately by IP address-based communication protocol message between network control layer equipment (as controller) and infrastructure layer equipment (i.e. forwarding unit), between the network terminal, and between the network terminal and application server, data traffic between application server and application server is forwarded by stream table between forwarding unit, the stream table of every bar stream generates by controller and is handed down to forwarding unit, inquiry and generation that controller carries out stream table is given on the data message of forwarding unit to the stream table not hitting the current storage of forwarding unit is unified, forwarding unit needs wait controller to issue new stream table just can forwarding data packets.
Fig. 1 is that in correlation technique, multicast user is based on BNG scene networking schematic diagram, and as shown in Figure 1, user multicast generally realizes direct or indirect every user by wideband network gateway (Broadband Network Gateway, referred to as BNG) equipment and copies.Certain BNG can pass through Access Node Control Protocol (Access Node Control Protocol, referred to as ANCP) switch such as protocol integrated test system SW1, SW2, issue corresponding multicast service strategy (such as, multicast access control, multicast replication control, multicast bandwidth control and multicast charging policy), but flow process is complicated, the fineness controlled and flexibility are also inadequate, so actual deployment is little.ANCP is by GSMPv3 general switch management protocol (General Switch Management Protocol, referred to as RFC3292) expand, continue to use the section sets of GSMPv3: as the neighbor uni-cast based on Adjacency Protocol Message, based on the Topology Discovery of Port Up/Down Event Message, based on the topological arrangement of Port Management Message.Also Internet Group Management Protocol (Internet Group ManagementProtocol can be opened in respective switch deploy in addition, referred to as IGMP) function of Snooping, the multicast group added by switch perception user also performs multicast replication work.But the chain of command functional requirement of this mode to switch is higher, and be not suitable for being deployed on SDN Autonomous Domain network internal forward node.Therefore, the method that user access network generally uses is carried out multicast message by user and is copied on borde gateway BNG, as shown in Figure 1, if the N number of user of this BNG gateway down-hanging, the flux of multicast that network side is come can carry out N part on BNG to be copied, there is very large bandwidth waste for the switch in user access network in this, as user4-userN N-3 part flux of multicast can all the time access switch SW3 take link bandwidth all the time between SW5 and BNG.
Therefore, in the related, borde gateway BNG carries out multicast message by user and copies, there is bandwidth waste, the problem that resource utilization is not high.
Summary of the invention
The invention provides a kind of multicast message duplication method, device and open flows controller, at least to solve in correlation technique, borde gateway BNG carries out multicast message by user and copies, there is bandwidth waste, the problem that resource utilization is not high.
According to an aspect of the present invention, provide a kind of multicast message duplication method, be applied to software defined network SDN, comprise: the link link topology obtaining open flows switch OFSW described SDN from open flows controller OFC; According to described link link topology, and the incidence relation of terminal use and multicast group determine described OFSW for the treatment of multicast group message stream table clause and organize table clause; The described stream table clause determined and described group of table clause are handed down to described OFSW by described OFC, and wherein, described OFSW carries out multicast replication process according to described stream table clause and described group of table clause to described multicast group message.
Preferably, according to described link link topology, and the described incidence relation of described terminal use and described multicast group determines that described OFSW is for the treatment of the stream table clause of multicast group message with organize table clause and comprise: after terminal use's access authentication passes through, pass through the forward-path of described SDN from network side node interface NNI to Customer Premises Network interface UNI for described terminal use calculates one; Along described forward-path, according to the described incidence relation of described terminal use and described multicast group, terminal use's set that OFSW one by one adds described multicast group by traversal determine flux of multicast that described terminal use gathers enter to interface corresponding go out to set of interfaces; Generate described group of table clause corresponding to described OFSW and described stream table clause to set of interfaces according to going out described in OFSW each on described forward-path, wherein, the action lists of described stream table clause comprises the action being associated with described group of table clause.
Preferably, according to after going out described in OFSW each on described forward-path and generating described group of table clause corresponding to described OFSW and described stream table clause to set of interfaces, also comprise: the multicast receiving described terminal use changes request; Described multicast according to the described terminal use that receives changes request, along described forward-path, according to the incidence relation of the described terminal use after upgrading with described multicast group, OFSW one by one enters described in renewal to interface corresponding go out to set of interfaces; Go out described in after upgrading according to OFSW each on described forward-path and upgrade described stream table clause corresponding to described OFSW and described group of table clause to set of interfaces.
Preferably, according to going out described in OFSW each on described forward-path to generate described group of table clause corresponding to described OFSW to set of interfaces and described stream table clause comprises: judge that whether the multicast resource of current OFSW on described forward-path is sufficient; When judged result is no, select the extra replication processes of a upper node at described current OFSW because described OFSW multicast resource deficiency causes the multicast message of described current OFSW user's set of not reproducible forwarding, wherein, the multicast message additionally copied with unicast forwarding processing mode by described current OFSW.
Preferably, in the extra replication processes of a upper node selected at described current OFSW because after the multicast message of the not enough described current OFSW user's set causing not reproducible to forward of described current OFSW multicast resource, also comprise: for the group table clause that a described upper node OFSW carries out multicast message replication processes and generate adds one to multiple bucket, wherein, the multicast group user that the described current OFSW of described one or more barrels of correspondences cannot process gathers and corresponding goes out to set of interfaces, described one or more bucket carries the operational motion for two of described multicast message layers of head being revised as clean culture encapsulation.
According to a further aspect in the invention, provide a kind of multicast message replication processes device, be applied to software defined network SDN, comprise: acquisition module, for obtaining the link link topology of open flows switch OFSW in described SDN from open flows controller OFC; Determination module, for according to described link link topology, and the incidence relation of terminal use and multicast group determines that described OFSW is for the treatment of the stream table clause of multicast group message with organize table clause; Issue module, for the described stream table clause determined and described group of table clause are handed down to described OFSW by described OFC, wherein, described OFSW carries out multicast replication process according to described stream table clause and described group of table clause to described multicast group message.
Preferably, described determination module comprises: computing unit, for after terminal use's access authentication passes through, passes through the forward-path of described SDN from network side node interface NNI to Customer Premises Network interface UNI for described terminal use calculates one; Determining unit, for along described forward-path, according to the described incidence relation of described terminal use and described multicast group, terminal use's set that OFSW one by one adds described multicast group by traversal determine flux of multicast that described terminal use gathers enter to interface corresponding go out to set of interfaces; Generation unit, for generating described group of table clause corresponding to described OFSW and described stream table clause to set of interfaces according to going out described in OFSW each on described forward-path, wherein, the action lists of described stream table clause comprises the action being associated with described group of table clause.
Preferably, described determination module also comprises: receiving element, changes request for the multicast receiving described terminal use; First updating block, request is changed for the described multicast according to the described terminal use received, along the described forward-path corresponding to terminal use that multicast change occurs, according to the incidence relation of described terminal use and the described multicast group after upgrading, OFSW one by one enters described in renewal to interface corresponding go out to set of interfaces; Second updating block, goes out described in after upgrading according to OFSW each on described forward-path and upgrades described stream table clause corresponding to described OFSW and described group of table clause to set of interfaces.
Whether preferably, described generation unit comprises: judgment sub-unit, sufficient for judging the multicast resource of current OFSW on described forward-path; Process subelement, for when the judged result of described judgment sub-unit is no, select the extra replication processes of a upper node at described current OFSW because described current OFSW multicast resource deficiency causes the multicast message of described current OFSW user's set of not reproducible forwarding, wherein, the multicast message additionally copied with unicast forwarding processing mode by described OFSW.
Preferably, described generation unit also comprises: add subelement, for adding one to multiple bucket for the group table clause that a described upper node OFSW carries out multicast message replication processes and generate, wherein, the multicast group user that the described current OFSW of described one or more barrels of correspondences cannot process gathers and corresponding goes out to set of interfaces, and described one or more bucket carries the operational motion for two of described multicast message layers of head being revised as clean culture encapsulation.
According to also one side of the present invention, provide a kind of open flows controller OFC, comprise the device described in above-mentioned any one.
By the present invention, adopt the link link topology obtaining open flows switch OFSW described SDN from open flows controller OFC; According to described link link topology, and the incidence relation of terminal use and multicast group determine described OFSW for the treatment of multicast group message stream table clause and organize table clause; The described stream table clause determined and described group of table clause are handed down to described OFSW by described OFC, wherein, described OFSW carries out multicast replication process according to described stream table clause and described group of table clause to described multicast group message, solve and on borde gateway BNG, carry out multicast message by user in correlation technique and copy, there is bandwidth waste, the problem that resource utilization is not high, and then reach and reduce multicast replication as much as possible, save bandwidth resources, avoid congested effect.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 be in correlation technique multicast user based on BNG scene networking schematic diagram;
Fig. 2 is the flow chart of the multicast message duplication method according to the embodiment of the present invention;
Fig. 3 is the structured flowchart of the multicast message replication processes device according to the embodiment of the present invention;
Fig. 4 is the preferred structure block diagram one of determination module 34 in the multicast message replication processes device according to the embodiment of the present invention;
Fig. 5 is the preferred structure block diagram two of determination module 34 in the multicast message replication processes device according to the embodiment of the present invention;
Fig. 6 is the preferred structure block diagram one of generation unit 46 in determination module 34 in the multicast message replication processes device according to the embodiment of the present invention;
Fig. 7 is the preferred structure block diagram two of generation unit 46 in determination module 34 in the multicast message replication processes device according to the embodiment of the present invention;
Fig. 8 is the structured flowchart of the open flows controller according to the embodiment of the present invention;
Fig. 9 is the networking schematic diagram copied according to the user multicast under the SDN framework of the embodiment of the present invention;
Figure 10 is the flow chart of the user multicast clone method according to the preferred embodiment of the invention under SDN framework.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Provide a kind of multicast message duplication method in the present embodiment, be applied to software defined network SDN, Fig. 2 is the flow chart of the multicast message duplication method according to the embodiment of the present invention, and as shown in Figure 2, this flow process comprises the steps:
Step S202, obtains the link link topology of open flows switch OFSW this SDN from open flows controller OFC;
Step S204, according to this link link topology, and the incidence relation of terminal use and multicast group determine OFSW for the treatment of multicast group message stream table clause and organize table clause;
Step S206, is handed down to OFSW by this stream table clause determined and group table clause by OFC, and wherein, this OFSW carries out multicast replication process according to above-mentioned stream table clause and group table clause to multicast group message.
Pass through above-mentioned steps, according to the link link topology of SDN, and the incidence relation of terminal use and multicast group determines carrying out the stream table clause of multicast message process and organizes table clause, namely the forward-path according to terminal use carries out the stream table clause of multicast forwarding data and organizes table clause, copy relative to carrying out multicast message by user in correlation technique on borde gateway BNG, there is bandwidth waste, the problem that resource utilization is not high, and then reach and reduce multicast replication as much as possible, save bandwidth resources, avoid congested effect.
According to link link topology, and the incidence relation of terminal use and multicast group determines that the stream table clause of OFSW for the treatment of multicast group message is with when organizing table clause, can be the embedded application of an of network element for what complete this operation, such as, after receiving the triggering message of reaching the standard grade of terminal use, authentication processing is carried out to this terminal use, after terminal use's access authentication passes through, pass through above-mentioned SDN for this terminal use calculates one (NNI is to the forward-path of Customer Premises Network interface UNI from network side node interface; Along forward-path, according to the incidence relation of terminal use and multicast group, the terminal use that OFSW one by one adds multicast group by traversal gather determine flux of multicast that terminal use gathers enter to interface corresponding go out to set of interfaces; Group table clause corresponding to OFSW and stream table clause is generated to set of interfaces according to going out of each OFSW on forward-path, wherein, it should be noted that, when generating stream table clause, can enter according to multicast group destination address key assignments (multicast object IP and/or multicast object MAC) and/or flux of multicast and generate to interface, the action lists of this stream table clause comprises the action being associated with group table clause.
The action lists of stream table clause comprises the action being associated with group table clause.The SDN topology information provided by OFC calculates unicast forwarding route for terminal use, and be the group table clause that each OFSW maintenance customer multicast is relevant along this terminal use's unicast forwarding route on SDN, adopt when specifying flux of multicast entrance on OFSW, by user's compound mapping of designated multicast group in outgoing interface set, thus generation group table clause, by the binding by unicast forwarding and multicast forwarding, ensure that the barrelage amount of group table clause is minimum, thus reduce copying of multicast message, effectively save the bandwidth of multicast link.
Terminal use can be in different situations, add or withdraw from multicast group, namely the multicast state of terminal use can change, and need when changing to carry out corresponding renewal according to the multicast state occurred to the link carrying out multicast, such as, according to after the going out and generate group table clause corresponding to OFSW and each OFSW on forward-path from stream table clause to set of interfaces, the multicast receiving terminal use changes request; Change request according to the multicast of terminal use received, along forward-path, according to the incidence relation of the terminal use after upgrading and multicast group, OFSW is one by one updated into interface corresponding go out to set of interfaces; Going out after upgrading according to OFSW each on forward-path upgrades stream table clause corresponding to OFSW and group table clause to set of interfaces, namely when the multicast relations of terminal use changes, each OFSW on the multicast link that the terminal use that multicast relations change occurs is corresponding carries out the renewal of corresponding stream table clause and group table clause (such as, convection current table clause and/or group table clause carry out following operation one of at least: create, amendment, to delete), to carry out multicast smoothly according to new multicast relations.
It should be noted that, generating group table clause corresponding to OFSW with when flowing table clause according to going out of each OFSW on forward-path to set of interfaces, the situation of multicast resource deficiency may be met, such as, the entry of group table, or the bucket that group is shown.Therefore, first can judge that whether the multicast resource of current OFSW on this forward-path is sufficient; When judged result is no, namely when judged result is the multicast resource deficiency on current OFSW, select the extra replication processes of a upper node at current OFSW because OFSW multicast resource deficiency causes the multicast message of current OFSW user's set of not reproducible forwarding, wherein, the multicast message additionally copied with unicast forwarding processing mode by this current OFSW.
In addition, in the extra replication processes of a upper node selected at current OFSW because after the multicast message of the not enough current OFSW user's set causing not reproducible to forward of current OFSW multicast resource, also comprise: for the group table clause that a node OFSW on this carries out multicast message replication processes and generate adds one to multiple bucket, wherein, the multicast group user that the current OFSW of these one or more barrels of correspondences cannot process gathers and corresponding goes out to set of interfaces, and one or more bucket carries the operational motion for two of multicast message layers of head being revised as clean culture encapsulation.
Additionally provide a kind of multicast message replication processes device in the present embodiment, this device is used for realizing above-described embodiment and preferred implementation, has carried out repeating no more of explanation.As used below, term " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following examples preferably realizes with software, hardware, or the realization of the combination of software and hardware also may and conceived.
Fig. 3 is the structured flowchart of the multicast message replication processes device according to the embodiment of the present invention, and as shown in Figure 3, this application of installation, in software defined network SDN, comprises acquisition module 32, determination module 34 and issues module 36, being described below to this device.
Acquisition module 32, for obtaining the link link topology of open flows switch OFSW in SDN from open flows controller OFC; Determination module 34, is connected to above-mentioned acquisition module 32, for according to link link topology, and the incidence relation of terminal use and multicast group determine OFSW for the treatment of multicast group message stream table clause with organize table clause; Issue module 36, be connected to above-mentioned determination module 34, for the stream determined table clause and group table clause are handed down to OFSW by OFC, wherein, OFSW carries out multicast replication process according to stream table clause and group table clause to multicast group message.
Fig. 4 is the preferred structure block diagram one of determination module 34 in the multicast message replication processes device according to the embodiment of the present invention, as shown in Figure 4, this determination module 34 comprises computing unit 42, determining unit 44 and generation unit 46, is described below to this determination module 34.
Computing unit 42, for after terminal use's access authentication passes through, passes through the forward-path of SDN from network side node interface NNI to Customer Premises Network interface UNI for terminal use calculates one; Determining unit 44, be connected to above-mentioned computing unit 42, for along forward-path, according to the incidence relation of terminal use with multicast group, the terminal use that OFSW one by one adds multicast group by traversal gather determine flux of multicast that terminal use gathers enter to interface corresponding go out to set of interfaces; Generation unit 46, is connected to above-mentioned determining unit 44, and for generating group table clause corresponding to OFSW and stream table clause according to going out of each OFSW on forward-path to set of interfaces, wherein, the action lists of stream table clause comprises the action being associated with group table clause.
Fig. 5 is the preferred structure block diagram two of determination module 34 in the multicast message replication processes device according to the embodiment of the present invention, as shown in Figure 5, this determination module 34 is except comprising all structures shown in Fig. 4, also comprise: receiving element 52, first updating block 54 and the second updating block 56, be described this determination module 34 below.
Receiving element 52, is connected to above-mentioned generation unit 46, changes request for the multicast receiving terminal use; First updating block 54, be connected to above-mentioned receiving element 52, request is changed for the multicast according to the terminal use received, along the forward-path corresponding to terminal use that multicast change occurs, according to the terminal use after upgrading and the incidence relation of multicast group, OFSW is one by one updated into interface corresponding go out to set of interfaces; Second updating block 56, is connected to above-mentioned updating block 54, and going out after upgrading according to OFSW each on forward-path generates stream table clause corresponding to OFSW and group table clause to set of interfaces.
Fig. 6 is the preferred structure block diagram one of generation unit 46 in determination module 34 in the multicast message replication processes device according to the embodiment of the present invention, as shown in Figure 6, this generation unit 46 comprises: judgment sub-unit 62 and process subelement 64, be described this first generation unit 46 below.
Whether judgment sub-unit 62 is sufficient for judging the multicast resource of current OFSW on forward-path; Process subelement 64, be connected to above-mentioned judgment sub-unit 62, for when the judged result of judgment sub-unit is no, select the extra replication processes of a upper node at current OFSW because current OFSW multicast resource deficiency causes the multicast message of current OFSW user's set of not reproducible forwarding, wherein, the multicast message additionally copied passes through OFSW with unicast forwarding processing mode.
Fig. 7 is the preferred structure block diagram two of generation unit 46 in determination module 34 in the multicast message replication processes device according to the embodiment of the present invention, as shown in Figure 7, this generation unit 46 is except comprising all structures shown in Fig. 6, also comprise and add subelement 72, below this interpolation subelement 72 is described.
Add subelement 72, be connected to above-mentioned process subelement 64, for adding one to multiple bucket for the group table clause that a upper node OFSW carries out multicast message replication processes and generate, wherein, the multicast group user that one or more barrels of current OFSW of correspondence cannot process gathers and corresponding goes out to set of interfaces, and one or more bucket carries the operational motion for two of multicast message layers of head being revised as clean culture encapsulation.
Fig. 8 is the structured flowchart of the open flows controller according to the embodiment of the present invention, and as shown in Figure 8, this open flows controller 80 comprises the multicast message replication processes device 82 of above-mentioned any one.
By above-described embodiment and preferred embodiment, above-mentioned multicast message replication processes can relate to the process of three aspects, carries out that multicast message copies the application (such as, BNG application) of control treatment, OFC and OFSW, this BNG application can be unified with OFC.The access authentication of process user is responsible in BNG application, multicast management, SDN topology information is provided to calculate unicast forwarding route for user according to OFC, and be the group table clause that each OFSW maintenance customer multicast is relevant along user's unicast forwarding route on SDN, adopt when specifying flux of multicast entrance on OFSW, by user's compound mapping of designated multicast group in outgoing interface set, thus generation group table clause, the barrelage amount of guarantee group table clause is minimum, thus reduce copying of multicast message, the stream table clause that BNG application generates and group table clause are handed down to corresponding OFSW by OFC.It is topological that OFC is responsible for collection SDN, issues stream table clause, group table clause etc., and provide the exchange channels of reach the standard grade certification triggering message and the multicast change message between terminal use and BNG application.And OFSW carries out replication processes according to the stream table clause received and group table clause for the multicast message of match hit.Wherein, it is pointed out that the protocol interface between OFC and OFSW is OpenFlow agreement.When BNG application is separated with OFC and disposes, interface suggestion is between the two RESTful interface, such as hypertext transfer protocol (HypertextTransfer Protocol, referred to as HTTP); Inner privately owned interface can be adopted during both unifications.These do not limit.
Having under this unified controller architecture of SDN/OpenFlow, BNG is no longer single physical equipment, but a kind of virtual unit formed by an OF Autonomous Domain network, the chain of command function realizing BNG (comprises certification, DHCP (Dynamic Host Configure Protocol, referred to as DHCP) the protocol conversation process such as/PPPoE) BNG apply (Application, referred to as APP) reside in open flows controller (OpenFlow Controller, referred to as OFC) on, also virtual (the Network Function Virtualization of network function can be used, referred to as NFV) mode reside on independent server, then the northbound interface and the OFC that pass through SDN are mutual.
Based on above-mentioned consideration, provide the user multicast replication theme under a kind of SDN framework in embodiments of the present invention, copied by the access network user multicast based on SDN framework, utilize the Multicast Replication Capability of the whole network network topology feature and each forward node perceived, press the subnet of link or isolation as far as possible (such as: VLAN (Virtual Local Area Network, referred to as VLAN)) copy multicast message, thus can copy by the more flexible and convenient user multicast that realizes, the bandwidth resources of key or backbone on effective saving user access network, avoid congested.
Below the user multicast replication theme under SDN framework is described.
Fig. 9 is the networking schematic diagram copied according to the user multicast under the SDN framework of the embodiment of the present invention, as shown in Figure 9, OF Autonomous Domain network indicates user access network in Fig. 9 schematic diagram, OFC can find that all open flows switch (OpenFlowSwitch, OFSW) nodes and link connect topological view.Figure 10 is the flow chart of the user multicast clone method according to the preferred embodiment of the invention under SDN framework, as shown in Figure 10, it should be noted that, below describe user multicast with comparatively stressing be replicated in manner of execution on user access network, copy for the user multicast under SDN framework, this flow process comprises the following steps:
Step S1002, OFC passes through and all OFSW link setups form OF Autonomous Domain network, and utilize link discovery mechanism (such as, Link Layer Discovery Protocol, Link Layer Discovery Protocol, referred to as LLDP) collect the Topology connection of this network, form the topological view be made up of node set and link set.
Step S1004, user reaches the standard grade and triggers message (PADI as DHCP Discovery or PPPoE) and accessed the interface of this message UNI(switch user oriented side by OF Autonomous Domain: the interface of edge switch access user) the OFSW perception at place, and hand to protocol processes corresponding to BNG application (such as by the path clustering of OFC, as the local specific protocol message that unknown flow rate or OFC preset stream entry capture, be encapsulated in OF-PacketIn message and give OFC, and resolve through OFC the APP functional module process handing to correspondence after perception).User reaches the standard grade after certification passes through, the path calculation module of OFC is that this user calculates the interface of its access UNI to first line of a couplet NNI(OF Autonomous Domain network towards public network side, multiple NNI can be had, NNI mainly expresses the entrance flowing through this OF Autonomous Domain of certain multicast source flow here) the two-way converting path of place node, and issue corresponding stream entry to this path OFSW on the way.
Step S1006, after calculating the forward-path of this user, is associated each node and each link in this user ID and its forward-path, forms the associated data table of user and forward node and link.Like this can according to user, node, enter mark to interface, retrieve interface.
User and link association table clause example as follows:
[UserID,NodeID,IngressInterface,EgressInterface]
Retrieval example is as follows:
<UserID,NodeID,IngressInterface>--><NodeID,EgressInterface>
Step S1008, OFC is added by BNG chain of command multicast protocol (serving as the role of multicast router) perception user or is left certain multicast group, form the associated data table of a user and multicast group (as <UserID, MulticastGroupID>), the multicast replication simultaneously triggering OF Autonomous Domain calculates, ALL group table information (Xin Jia or renewal) relevant with this multicast group on each OFSW on the forward-path revising this user in OF Autonomous Domain.Such as, the user's set adding this multicast group is retrieved by multicast group id, what travel through that these multicast traffics on OFSW that this user is integrated into current calculating enter enters to the set gone out to interface corresponding to interface, then generate the group table clause of ALL type according to this outgoing interface set, be handed down to the OFSW of current calculating.Because the number of links meeting this constraints is far smaller than number of users usually, thus can reduce multicast message copy demand.If when certain multicast replication calculates, multicast resource on certain node (such as, group table clause or Bucket entry amount full) not enough, then select to copy by user at a upper sensor selection problem in this path, a newly-increased Bucket, arranges action and two of multicast message layers of information is made into the mode of clean culture (such as, the multicast object MAC of message is modified as user MAC in this Bucket, multicast IP is constant), this Bucket follow-up copies forwarding message out on path, walks clean culture flow process; When user leaves this multicast group, this user multicast message of delete processing copies Bucket.
The Bucket information of OFSW by existing in ALL group table clause, implements multicast message and copies.
Step S1010, subsequent user adds or leaves certain multicast group and all can trigger the group table clause of OFC to the corresponding multicast group of each OFSW node in path, user place according to above-mentioned rule and calculate, find that there is link change just amendment group table clause and be handed down to corresponding OFSW node.Such as, what the multicast group of node was corresponding go out to set of interfaces from null set becomes when having nonempty set, newly-increased ALL type group table clause; What the multicast group of node was corresponding goes out to set of interfaces is nonempty set, and the number of links of set has during increase and decrease to be increased or corresponding Bucket in deletion group table clause; What the multicast group of node was corresponding goes out the ALL type group table clause deleted when nonempty set becomes null set to set of interfaces.
Below in conjunction with preferred implementation, the present invention will be described.
Preferred implementation one
Shown in Fig. 9, describe user with networking example above and add and leave the group table change caused:
1, after User1 certification access, form the associated data table clause (because user multicast mainly considers the path of NNI to UNI, so below only for the data table entries in this path) of user and forward node and link, comprising:
[User1ID,OFSW1ID,Intf1-2，Intf1-1（UNI）]
[User1ID,OFSW4ID,Intf4-3，Intf4-1]
[User1ID,OFSW6ID,Intf6-3（NNI），Intf6-1]
2, User1 adds multicast group MulticastGroup1, forms the associated data table clause of user and multicast group: [User1ID, MulticastGroup1ID].
3, for multicast group MulticastGroup1 calculates the group table clause of User1 forward-path in OF Autonomous Domain.
A, find user User1 by MulticastGroup1ID.
B, change along the forward-path node-by-node algorithm group table clause (corresponding MulticastGroup1) of User1.
C, on OFSW6, with <User1ID, OFSW6ID, Intf6-3(NNI) > finds the Intf6-1 of OFSW6, newly-increased ALL type group table clause, and this group entry has a Bucket, the action of output Intf6-1 is had in this Bucket, if this interface is the sub-interface of configuration VLAN, then set is had to express the semanteme (such as, VLAN tag is set, outputs to actual physical interfaces etc.) exported from this sub-interface in Bucket.OFSW4 and OFSW1 does similar operation and calculates corresponding group table clause.
D, OFC trigger and issue corresponding stream table clause (identifying the stream table of MulticastGroup1, the group table clause ID that mounting is corresponding) to each OFSW and organize table clause, get through the flux of multicast of user, certainly also to allow in step C pointwise after node-by-node algorithm to issue.
4, after User2 certification access, the associated data table clause (because user multicast mainly considers the path of NNI to UNI, so below only for the data table entries in this path) of user and forward node and link is formed.
[User2ID,OFSW2ID,Intf2-3，Intf2-1（UNI）]
[User2ID,OFSW4ID,Intf4-3，Intf4-2]
[User2ID,OFSW6ID,Intf6-3（NNI），Intf6-1]
5, User2 also adds multicast group MulticastGroup1, forms the associated data table clause of user and multicast group: [User2ID, MulticastGroup1ID].
6, for multicast group MulticastGroup1 calculates the group table clause of User2 forward-path in OF Autonomous Domain.
A, find user User1 and User2 by MulticastGroup1ID.
B, change along the forward-path node-by-node algorithm group table clause (corresponding MulticastGroup1) of User2.
C, on OFSW6, with <User1ID, OFSW6ID, Intf6-3(NNI) > finds the Intf6-1 of OFSW6, with <User2ID, OFSW6ID, Intf6-3(NNI) > finds the Intf6-1 of OFSW6, illustrates that group table clause corresponding on OFSW6 does not change.
The interface that D, the known OFSW6Intf6-1 of the topology link information data of attempting found according to OFC connect OFSW4 is Intf4-3.So on OFSW4, with <User1ID, OFSW4ID, Intf4-3> finds the Intf4-2 port of OFSW4, with <User1ID, OFSW4ID, Intf4-3> finds the Intf4-1 port of OFSW4, there is change, then upgrade existing group of table clause, increase a Bucket, the action of output Intf4-2 is had in this Bucket, if this interface is the sub-interface of configuration VLAN, the semanteme then having set to express in Bucket to export from this sub-interface (such as, VLAN tag is set, output to actual physical interfaces etc.).
E, on OFSW2, because there is no the information of User1, so need not User1 be looked into, with <User2ID, OFSW2ID, Intf2-3> finds the Intf2-1(UNI of OFSW2), newly-increased ALL type group table clause, there is a Bucket, the action of output Intf2-1 is had in this Bucket, if this interface is the sub-interface of configuration VLAN, then set is had to express the semanteme (such as, VLAN tag is set, outputs to actual physical interfaces etc.) exported from this sub-interface in Bucket.
F, OFC trigger and (such as identify the stream of MulticastGroup1 with multicast MAC to there being each OFSW of group table clause change to issue corresponding stream table clause, the group table clause ID that mounting is corresponding) and group table clause, get through the flux of multicast of user, certainly also to allow in step C pointwise after node-by-node algorithm to issue.
7, by that analogy, account form and process that User3, User4 and UserN add multicast group MulticastGroup1 can be understood.
8, User1 leaves MulticastGroup1, after OFC perceives this event, prolongs each node that path, User1 place is right, for it checks that MulticastGroup1 user gathers the change impact that go out to interface link set corresponding on MulticastGroup1.For OFSW6, because going out to interface of User2 is also that leaving of Intf6-1, User1 does not affect corresponding the going out to set of interfaces of MulticastGroup1, so the group table clause of MulticastGroup1 correspondence on OFSW6 does not change; For OFSW4, the going out of causing MulticastGroup1 corresponding of leaving of User1 has lacked Intf4-1 to set of interfaces, so the group table clause of MulticastGroup1 correspondence on OFSW4 should delete the Bucket of the corresponding Intf4-1 of an outgoing interface, OFC issues corresponding group table amendment message upgrades correspondence group table clause to OFSW4; Going out of causing MulticastGroup1 corresponding of leaving for OFSW1, User1 becomes null set to set of interfaces, and OFC issues corresponding group table amendment message and deletes corresponding group table clause to OFSW1.
9, by that analogy, account form and process that User2, User3, User4 and UserN leave multicast group MulticastGroup1 can be understood.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a multicast message duplication method, is characterized in that, is applied to software defined network SDN, comprises:
The link link topology of open flows switch OFSW described SDN is obtained from open flows controller OFC;
According to described link link topology, and the incidence relation of terminal use and multicast group determine described OFSW for the treatment of multicast group message stream table clause and organize table clause;
The described stream table clause determined and described group of table clause are handed down to described OFSW by described OFC, and wherein, described OFSW carries out multicast replication process according to described stream table clause and described group of table clause to described multicast group message.
2. method according to claim 1, is characterized in that, according to described link link topology, and the described incidence relation of described terminal use and described multicast group determines that described OFSW is for the treatment of the stream table clause of multicast group message with organize table clause and comprise:
After terminal use's access authentication passes through, pass through the forward-path of described SDN from network side node interface NNI to Customer Premises Network interface UNI for described terminal use calculates one;
Along described forward-path, according to the described incidence relation of described terminal use and described multicast group, terminal use's set that OFSW one by one adds described multicast group by traversal determine flux of multicast that described terminal use gathers enter to interface corresponding go out to set of interfaces;
Generate described group of table clause corresponding to described OFSW and described stream table clause to set of interfaces according to going out described in OFSW each on described forward-path, wherein, the action lists of described stream table clause comprises the action being associated with described group of table clause.
3. method according to claim 2, is characterized in that, according to after going out described in OFSW each on described forward-path and generating described group of table clause corresponding to described OFSW and described stream table clause to set of interfaces, also comprises:
The multicast receiving described terminal use changes request;
Described multicast according to the described terminal use that receives changes request, along described forward-path, according to the incidence relation of the described terminal use after upgrading with described multicast group, OFSW one by one enters described in renewal to interface corresponding go out to set of interfaces;
Go out described in after upgrading according to OFSW each on described forward-path and upgrade described stream table clause corresponding to described OFSW and described group of table clause to set of interfaces.
4. method according to claim 2, is characterized in that, according to going out described in OFSW each on described forward-path to generate described group of table clause corresponding to described OFSW to set of interfaces and described stream table clause comprises:
Judge that whether the multicast resource of current OFSW on described forward-path is sufficient;
When judged result is no, select the extra replication processes of a upper node at described current OFSW because described OFSW multicast resource deficiency causes the multicast message of described current OFSW user's set of not reproducible forwarding, wherein, the multicast message additionally copied with unicast forwarding processing mode by described current OFSW.
5. method according to claim 4, it is characterized in that, in the extra replication processes of a upper node selected at described current OFSW because after the multicast message of the not enough described current OFSW user's set causing not reproducible to forward of described current OFSW multicast resource, also comprise:
For the group table clause that a described upper node OFSW carries out multicast message replication processes and generate adds one to multiple bucket, wherein, the multicast group user that the described current OFSW of described one or more barrels of correspondences cannot process gathers and corresponding goes out to set of interfaces, and described one or more bucket carries the operational motion for two of described multicast message layers of head being revised as clean culture encapsulation.
6. a multicast message replication processes device, is characterized in that, is applied to software defined network SDN, comprises:
Acquisition module, for obtaining the link link topology of open flows switch OFSW in described SDN from open flows controller OFC;
Determination module, for according to described link link topology, and the incidence relation of terminal use and multicast group determines that described OFSW is for the treatment of the stream table clause of multicast group message with organize table clause;
Issue module, for the described stream table clause determined and described group of table clause are handed down to described OFSW by described OFC, wherein, described OFSW carries out multicast replication process according to described stream table clause and described group of table clause to described multicast group message.
7. device according to claim 6, is characterized in that, described determination module comprises:
Computing unit, for after terminal use's access authentication passes through, passes through the forward-path of described SDN from network side node interface NNI to Customer Premises Network interface UNI for described terminal use calculates one;
Determining unit, for along described forward-path, according to the described incidence relation of described terminal use and described multicast group, terminal use's set that OFSW one by one adds described multicast group by traversal determine flux of multicast that described terminal use gathers enter to interface corresponding go out to set of interfaces;
Generation unit, for generating described group of table clause corresponding to described OFSW and described stream table clause to set of interfaces according to going out described in OFSW each on described forward-path, wherein, the action lists of described stream table clause comprises the action being associated with described group of table clause.
8. device according to claim 7, is characterized in that, described determination module also comprises:
Receiving element, changes request for the multicast receiving described terminal use;
First updating block, request is changed for the described multicast according to the described terminal use received, along the described forward-path corresponding to terminal use that multicast change occurs, according to the incidence relation of described terminal use and the described multicast group after upgrading, OFSW one by one enters described in renewal to interface corresponding go out to set of interfaces;
Second updating block, goes out described in after upgrading according to OFSW each on described forward-path and upgrades described stream table clause corresponding to described OFSW and described group of table clause to set of interfaces.
9. device according to claim 7, is characterized in that, described generation unit comprises:
Whether judgment sub-unit is sufficient for judging the multicast resource of current OFSW on described forward-path;
Process subelement, for when the judged result of described judgment sub-unit is no, select the extra replication processes of a upper node at described current OFSW because described current OFSW multicast resource deficiency causes the multicast message of described current OFSW user's set of not reproducible forwarding, wherein, the multicast message additionally copied with unicast forwarding processing mode by described OFSW.
10. device according to claim 9, is characterized in that, described generation unit also comprises:
Add subelement, for adding one to multiple bucket for the group table clause that a described upper node OFSW carries out multicast message replication processes and generate, wherein, the multicast group user that the described current OFSW of described one or more barrels of correspondences cannot process gathers and corresponding goes out to set of interfaces, and described one or more bucket carries the operational motion for two of described multicast message layers of head being revised as clean culture encapsulation.
11. 1 kinds of open flows controller OFC, is characterized in that, comprise the device according to any one of claim 6 to 10.
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