CN100589399C - Method and system for realizing multicast service on multi-service transmission platform - Google Patents
Method and system for realizing multicast service on multi-service transmission platform Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing multicast service on MSTP. A group of timeslots is equipped on a transmission path to establish a multicast logical sub-net; the cross connection between the upper connection port of a packet switch module of converging network elements and the multicast logical sub-net is established, allowing the multicast service to be delivered from the converging network elements to the multicast logical sub-net; the cross connection between the upper connection port of the packet switch module of every access network element and the multicast logical sub-net is established, allowing every access network element to be able to receive the multicast service from the multicast logical sub-net and allowing the multicast service to be able to be transmitted along the multicast logic sub-net; the ports of the converging network elements and the access network elements is set to allow the multicast service to be distributed from the converging network elements to every access network element. By establishing the independent multicast logical sub-net, the timeslot cross module participates the multicast, and achieves high-efficient multicastdata transmission with the packet switch module, therefore, accomplishing the, thereby realizing the static multicast and the dynamic multicast of MSTP.
Description
Technical field
The present invention relates to the data traffic transmission network technology, relate in particular to the multicasting technology in the multi-service transmission.
Background technology
MSTP (MultiService Transport Platform, multiservice transport platform) be with SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) or SONET (Synchronous Optical Network, Synchronous Optical Network) technology is the basis, can transmit TDM (Time Division Multiplexing, time division multiplexing), Ethernet, IP (Internet Protocol, Internet protocol) and the network platform of multiple business such as ATM (Asynchronous TransferMode, asynchronous transfer mode) data.Ethernet or IP bag can pass through GFP (Generic Framing Procedure, Generic Framing Procedure) etc. mode is encapsulated in the higher order path of SDH or SONET or VCG (Virtual Concatenation Group, the virtual cascade group) pipeline that the low order channel virtual container is formed.Higher order path that the present invention relates to or low order channel can comprise: the VC4-4C of VC12, VC3, VC4 and cascade continuously etc.
The networking of MSTP can be the hybrid mode of ring-like, chain or ring-like and chain.
In access network, MSTP transmission network element is divided into convergence network element and access network element.The user inserts by access network element; Multicast server then is connected on the convergence network element.Multicast service sends on a plurality of access network elements from convergence network element, requires server to send a multicast packet, and the network element that participates in program request can be received a same data separately.
MSTP transmits the multicast packet business, the technology that adopts mainly is at present: packet switch (Ethernet or the IP exchange) intermodule at convergence network element and each access network element is set up the Virtual Concatenation passage of point-to-point respectively, the packet switch module of convergence network element is made multicast, and access network element (except multicasting to the port that non-networking uses) can not made multicast.
This method is very big to transfer bandwidth consumption, and (be virtual cascade group: VCG), and the linking number of point-to-point is many more, and the total bandwidth that takies is big more because the connection of each point-to-point all will take set of time-slot on whole ring or the chain.For the MSTP network of a 622M bandwidth, if the total bandwidth of multicast service is 200M, a looped network or connection that link network can only be built 3 point-to-points at most so.
Therefore, need a kind of solution of multicast efficiently, be used for overcoming the serious problem of bandwidth waste that exists in the prior art based on MSTP.
Summary of the invention
Main purpose of the present invention is to provide a kind of method and system of realizing multicast service on MSTP, is used to solve the serious problem of bandwidth waste, realizes that the high-efficient multicast data of MSTP transmits.
To achieve these goals, according to a first aspect of the invention, the invention provides a kind of method that on MSTP, realizes multicast service.Method may further comprise the steps:
Step S 102, on transmission path, by set of time-slot is set, set up multicast logical sub-net;
Step S104, set up the first line of a couplet port of packet switch module of convergence network element and the interconnection between the multicast logical sub-net, make multicast service to send to multicast logical sub-net from convergence network element, wherein, select the transmit port of the first line of a couplet port of packet switch module as multicast service, each multicast logical sub-net all has a first line of a couplet port corresponding with it, connects by the configuration of SDH/SONET time slot Cross module;
Step S106, set up the first line of a couplet port of packet switch module of each access network element and the interconnection between the multicast logical sub-net, make that each access network element can be from the multicast logical sub-net receiving multicast business, and make multicast service to forward along multicast logical sub-net, wherein, select the receiving port of a first line of a couplet port of packet switch module, connect by the configuration of SDH/SONET time slot Cross module as multicast service;
Step S 108, and the port of convergence network element and access network element is provided with, and make multicast service to be distributed to each access network element from convergence network element.
Alternatively, between convergence network element and each access network element, set up point-to-point respectively and be connected, be used to transmit unicast service and procotol.
Multicast logical sub-net, promptly the transmission path of multicast service can comprise at least a in the ring-like and chain path.MSTP can adopt SDH or SONET.
Alternatively, in step S108, to convergence network element and each access network element, set up the corresponding relation between first line of a couplet port and the multicast service port, be used for after protocol processes is finished, realize dynamic multicast configuration, wherein, the multicast service port is the transmit port of multicast service or the receiving port of multicast service.Alternatively, in step S108,, realize the static multicast configuration by network management configuration.
To achieve these goals, according to a second aspect of the invention, the invention provides a kind of system that on MSTP, realizes multicast service.System comprises: transmission network, be used to transmit multicast service, and transmission network is provided with set of time-slot, is used to constitute multicast logical sub-net; Convergence network element, be connected on the transmission network, establish interconnection between the first line of a couplet port of the packet switch module of convergence network element and the multicast logical sub-net, select the transmit port of the first line of a couplet port of packet switch module as multicast service, each multicast logical sub-net, all should there be a first line of a couplet port corresponding with it, connects, be used for multicast service is sent to multicast logical sub-net from convergence network element by the configuration of SDH/SONET time slot Cross module; And access network element, be connected on the transmission network, establish interconnection between the first line of a couplet port of the packet switch module of each access network element and the multicast logical sub-net, select the receiving port of a first line of a couplet port of packet switch module as multicast service, connect by the configuration of SDH/SONET time slot Cross module, be used for each access network element from the multicast logical sub-net receiving multicast business, multicast service forwards along multicast logical sub-net simultaneously.The port of convergence network element and access network element is set for multicast service and is distributed to each access network element from convergence network element.
Convergence network element and access network element comprise respectively: the packet switch module, be used to finish duplicating and transmitting of multicast packet, and the packet switch module comprises a plurality of first line of a couplet ports, is used for being associated with set of time-slot; Network protocol module is used to finish the processing of multicast protocol; The time slot Cross module is used to set up the time slot interconnection between the light mouth of the set of time-slot of first line of a couplet port and transmission network, the set of time-slot that makes first line of a couplet port correspond respectively to not share the same light mouthful; And the network management configuration module, be used to realize the configuration and the cross-coupled configuration of time slot of packet switching service (PSS).
Alternatively, convergence network element and each access network element establish the corresponding relation between first line of a couplet port and the multicast service port, are used for after protocol processes is finished, and realize dynamic multicast configuration, wherein, the multicast service port is the transmit port of multicast service or the receiving port of multicast service.Alternatively, the network management configuration module is used to realize the static multicast configuration.
Comprise at transmission network under the situation of bidirectional orbicular that the time slot Cross module of convergence network element carries out concurrent processing to both direction, the time slot Cross module of access network element carries out excellent receipts to both direction to be handled.
Alternatively, establish point-to-point respectively between convergence network element and each access network element and be connected, be used to transmit unicast service and procotol.
Transmission network can comprise at least a in the ring-like and chain network.MSTP can adopt SDH or SONET.
Pass through technique scheme, the present invention is by setting up independent multicast logical sub-net, make SDH/SONET time slot Cross module participate in multicast, and finish the high-efficient multicast data transmission together, thereby realized static multicast and the dynamic multicast of MSTP with the packet switch module.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is a flow chart of realizing the method for multicast service according to of the present invention on multiservice transport platform;
Fig. 2 is a schematic block diagram of realizing the system of multicast service according to of the present invention on multiservice transport platform;
Fig. 3 is the MSTP networking diagram according to the embodiment of the invention; And
Fig. 4 is the network element structure chart according to the embodiment of the invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
With reference to Fig. 1, the method for multicast service that realizes on MSTP according to the present invention may further comprise the steps:
Step S102 on transmission path, by set of time-slot is set, sets up multicast logical sub-net.Multicast logical sub-net, promptly the transmission path of multicast service can comprise at least a in the ring-like and chain path.
Step S104, set up the first line of a couplet port of packet switch module of convergence network element and the interconnection between the multicast logical sub-net, make multicast service to send to multicast logical sub-net from convergence network element, wherein, select the transmit port of the first line of a couplet port of packet switch module as multicast service, each multicast logical sub-net all has a first line of a couplet port corresponding with it, connects by the configuration of SDH/SONET time slot Cross module.
Step S106, set up the first line of a couplet port of packet switch module of each access network element and the interconnection between the multicast logical sub-net, make that each access network element can be from the multicast logical sub-net receiving multicast business, and make multicast service to forward along multicast logical sub-net.For each multicast logical sub-net, convergence network element all has a first line of a couplet port corresponding with it, wherein, selects the receiving port of a first line of a couplet port of packet switch module as multicast service, connects by the configuration of SDH/SONET time slot Cross module.
Step S108 is provided with the port of convergence network element and access network element, makes multicast service to be distributed to each access network element from convergence network element.Alternatively, to convergence network element and each access network element, set up the corresponding relation between first line of a couplet port and the multicast service port, be used for after protocol processes is finished, realize dynamic multicast configuration, wherein, the multicast service port is the transmit port of multicast service or the receiving port of multicast service.Alternatively, by network management configuration, realize the static multicast configuration.
Alternatively, between convergence network element and each access network element, set up point-to-point respectively and be connected, be used to transmit unicast service and procotol.MSTP can adopt SDH or SONET.
With reference to Fig. 2, the system 10 of multicast service that realizes on MSTP according to the present invention comprises: transmission network 20, convergence network element 30 and access network element 40.
The port of convergence network element 30 and access network element 40 is set for multicast service and is distributed to each access network element 40 from convergence network element 30.
Alternatively, convergence network element 30 and each access network element 40 establish the corresponding relation between multicast protocol port and the multicast service port, are used for after protocol processes is finished, and realize dynamic multicast configuration, wherein, the multicast service port is the transmit port of multicast service or the receiving port of multicast service.Alternatively, the network management configuration module is used to realize the static multicast configuration.
Comprise at transmission network 20 under the situation of bidirectional orbicular that the time slot Cross module of convergence network element 30 carries out concurrent processing to both direction, the time slot Cross module of access network element 40 carries out excellent receipts to both direction to be handled.
Alternatively, establish point-to-point respectively between convergence network element 30 and each access network element 40 and be connected, be used to transmit unicast service and procotol.
MSTP can adopt SDH or SONET.
The present invention relates to Access Layer multi-service transmission field, ethernet switch technology, IP switching technology, relate in particular to the time slot configuration technology of SDH or SONET, and the multicasting technology in the packet network.
Fig. 4 is the relevant components module of network element, and the incidence relation schematic diagram of intermodule.With reference to Fig. 4, the network node of multiservice transport platform (being network element) comprises following correlation module:
SDH/SONET time slot Cross module 46 is used to set up the time slot interconnection between the set of time-slot of packet switch module 42 first line of a couplet ports and MSTP light mouth that transmission group net uses.By this interconnection, the first line of a couplet port of each packet switch module 42 can correspond to respectively in the set of time-slot of different MS TP light mouth and go.
Network management configuration module 48, this module are finished the configuration and the cross-linked configuration of SDH/SONET time slot of packet switching service (PSS).
All relate to above module in the existing technology, but the technology used in the present invention difference is: SDH/SONET time slot Cross module has also participated in multicast, and finishes high-efficient multicast data together with the packet switch module and transmit.And the present invention can use the concurrent excellent receipts mechanism of SNCP (path protection), can accomplish that the multicast service that encircles realizes automatically protection (fault self-recovery) fast.
Method of realizing group broadcasting on the multiservice transport platform may further comprise the steps:
The first step: the circuit of setting up point-to-point between convergence network element and each access network element respectively is connected, and is used to transmit unicast service and procotol;
Second step: on MSTP ring or chain, mark part SDH/SONET time slot, set up independently logical subnetwork (multicast logical sub-net), be specifically designed to the transmission of multicast service;
The 3rd step: in convergence network element, set up the first line of a couplet port of packet switch module and the interconnection between multicast logical sub-net, make the multicast packet business can send on the multicast logical sub-net;
The 4th step: at access network element, set up the first line of a couplet port of packet switch module and the interconnection between multicast logical sub-net, the multicast packet business can be received from multicast logical sub-net, continue to forward along multicast logical sub-net simultaneously;
The 5th step: in the packet switch module of each network element, set up the corresponding relation of first line of a couplet port and multicast service port,, can find certain protocol port corresponding service port to carry out dynamic multicast configuration so that after protocol processes is finished;
The 6th step: each network element moves agreement or by network management configuration, realizes dynamic multicast or static multicast, makes business can pass through convergence network element and access network element, is distributed to efficiently on each access network element equipment.
The present invention is that example is introduced with ring-like and mixed networking chain, referring to Fig. 3.Fig. 3 is the typical networking that the present invention uses.This networking comprises a two-way ring and a two-way chain.In fact can be the mixed networking mode of any ring and chain.Below in conjunction with the networking of Fig. 3, the enforcement of technical scheme is described in further detail:
The A: (L1～L5), be used to transmit unicast service and procotol that is connected that between convergence network element Na and each access network element (Nb, Nc, Nd, Ne, Nf), sets up point-to-point respectively.These connections are set up by SDH/SONET time slot Cross module, can be communicated with the relevant first line of a couplet port of packet switch module between different network elements.Certainly, prerequisite is that corresponding first line of a couplet port has been set up contact with a certain group of time slot on the corresponding packet switch module; Suppose that each bar connects and the relation table 1 of packet switch module first line of a couplet port shown in (first line of a couplet port table is shown NNI in the table).
Table 1
| Clean culture connects | Both port of origination | Destination interface |
| L1 | Na/NNI1 | Nb/NNI1 |
| L2 | Na/NNI2 | Nc/NNI1 |
| L3 | Na/NNI3 | Nd/NNI1 |
| L4 | Na/NNI4 | Ne/NNI1 |
| L5 | Na/NNI5 | Nf/NNI1 |
B: on MSTP ring or chain, set up independently logical subnetwork (multicast logical sub-net), be specifically designed to the transmission of multicast service.This logical subnetwork is actually the set of time-slot (virtual container) on MSTP ring or the chain.If the MSTP networking is a ring (as the ring of Na, Nb, Nc, Nd composition), this logical subnetwork also is a ring (two-way ring G1) so; If the MSTP networking is a chain (as the chain of Na, Ne, Nf composition), this logical subnetwork also is a chain (originating in the unidirectional chain G2 of convergence network element) so.Multicast packet will transmit on multicast logical sub-net.
C:, select the transmit port of the first line of a couplet port of packet switch module as multicast service in convergence network element.Each multicast logical sub-net all should have a first line of a couplet port corresponding with it.Connect by the configuration of SDH/SONET time slot Cross module, multicast packet can be sent on the corresponding logical subnetwork.For the logical subnetwork of bidirectional orbicular, there is the thing both direction, the time slot Cross module should be done concurrent processing, is convenient to access network element like this and realizes professional protection.
D:, select the receiving port of a first line of a couplet port of packet switch module as multicast service at access network element.Connect by the configuration of SDH/SONET time slot Cross module, multicast packet can be received from corresponding logical subnetwork, continue to forward along multicast logical sub-net simultaneously.For the logical subnetwork of bidirectional orbicular, there is the thing both direction, the time slot Cross module should be made judgment processing, and the preferential time slot of selecting not have to alarm intersects.
By above step, at each multicast logical sub-net, all set up the multicast topology structure of a tree type, this topology all can have one at the network element of each process and be branched to the packet switch module.The relation of logic of propositions subnet and multicast first line of a couplet port is as shown in table 2.
Table 2
| Multicast logical sub-net | Port one | Port 2 | Port 3 | Port 4 |
| G1 | Na/NNI11 | Nb/NNI2 | Nc/NNI2 | Nd/NNI2 |
| G2 | Na/NNI12 | Ne/NNI12 | Nf/NNI12 |
E: in the packet switch module of each network element, set up the corresponding relation of procotol port and multicast service port,, can find protocol port corresponding service port to carry out dynamic multicast configuration so that after protocol interaction is finished, as shown in table 3.
Table 3
Suppose that the user is connected in the UNIc port of access network element; Multicast server is connected in the UNIs port of convergence network element Na, explanation static state respectively and the dynamically implementation method of dual mode below:
F is if static multicast then according to the requirement of business, directly is provided with the multicast group of multicast channel correspondence by configuration order on webmaster.Promptly at each multicast channel, set up the corresponding relation of multicast address and multicast port: such as at convergence network element Na, certain multicast group should comprise Service-Port UNIs and multicast service port NNI11, NNI12; At access network element Nb, corresponding multicast group should comprise multicast service port NNI2 and user port UNIc; Other access network element configuration and Nb are basic identical.
G is if dynamic multicast then will be enabled multicast protocol at all network elements.For certain specific user's program request, the result of agreement operation is exactly the corresponding relation of setting up or having revised between certain multicast address and multicast port.By agreement program request channel, it is L1 (Na/NNI1＜----〉Nb/NNI1) in the table 1 that the clean culture of operation agreement connects as the UNIc of Nb, and then the multicast service port that obtains the protocol port correspondence by look-up table 3 is respectively the NNI11 of Na and the NNI2 of Nb; Like this, at convergence network element Na, this multicast group should comprise Service-Port UNIs and multicast service port NNI11, and at access network element Nb, this multicast group should comprise multicast service port NNI2 and user port UNIc.
The invention solves the serious problem of bandwidth waste, is a kind of solution of dynamic multicast efficiently based on multiservice transport platform.In addition, because physical layer uses the circuit of SDH/SONET time slot to connect, other is protected at a high speed so can realize professional 50ms level on ring.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a method that realizes multicast service on multiservice transport platform is characterized in that, may further comprise the steps:
Step S102 on transmission path, by set of time-slot is set, sets up multicast logical sub-net;
Step S104, set up the first line of a couplet port of packet switch module of convergence network element and the interconnection between the described multicast logical sub-net, make described multicast service to send to described multicast logical sub-net from described convergence network element, wherein, select the transmit port of the first line of a couplet port of described packet switch module as described multicast service, each described multicast logical sub-net all has a first line of a couplet port corresponding with it, connects by the configuration of SDH/SONET time slot Cross module;
Step S106, set up the first line of a couplet port of packet switch module of each access network element and the interconnection between the described multicast logical sub-net, make each described access network element to receive described multicast service from described multicast logical sub-net, and make described multicast service to forward along described multicast logical sub-net, wherein, select the receiving port of a first line of a couplet port of described packet switch module, connect by described SDH/SONET time slot Cross module configuration as described multicast service;
Step S108 is provided with the port of described convergence network element and described access network element, makes described multicast service to be distributed to each described access network element from described convergence network element.
2. method according to claim 1 is characterized in that, sets up point-to-point respectively and be connected between the described access network element of described convergence network element and each, is used to transmit unicast service and procotol.
3. method according to claim 1 is characterized in that, the transmission path of described multicast service comprises at least a in the ring-like and chain path.
4. method according to claim 1 is characterized in that, described multiservice transport platform adopts SDH (Synchronous Digital Hierarchy) or Synchronous Optical Network.
5. according to each described method in the claim 1 to 4, it is characterized in that, in step S108, to described convergence network element and each described access network element, set up the corresponding relation between first line of a couplet port and the multicast service port, be used for after protocol processes is finished, realize dynamic multicast configuration, described multicast service port is the transmit port of described multicast service or the receiving port of described multicast service.
6. according to each described method in the claim 1 to 4, it is characterized in that, in step S108,, realize the static multicast configuration by network management configuration.
7. a system that realizes multicast service on multiservice transport platform is characterized in that,
Comprise:
Transmission network is used to transmit described multicast service, and described transmission network is provided with set of time-slot, is used to constitute multicast logical sub-net;
Convergence network element, be connected on the described transmission network, establish interconnection between the first line of a couplet port of the packet switch module of described convergence network element and the described multicast logical sub-net, select the transmit port of the first line of a couplet port of described packet switch module as described multicast service, each described multicast logical sub-net, all should there be a first line of a couplet port corresponding with it, connects, be used for described multicast service is sent to described multicast logical sub-net from described convergence network element by the configuration of SDH/SONET time slot Cross module; And
Access network element, be connected on the described transmission network, establish interconnection between the first line of a couplet port of the packet switch module of each described access network element and the described multicast logical sub-net, select the receiving port of a first line of a couplet port of described packet switch module as described multicast service, connect by the configuration of SDH/SONET time slot Cross module, be used for each described access network element and receive described multicast service, and described multicast service forwards along described multicast logical sub-net from described multicast logical sub-net
Wherein, the port of described convergence network element and described access network element is set for described multicast service and is distributed to each described access network element from described convergence network element.
8. system according to claim 7 is characterized in that, described convergence network element and described access network element comprise respectively:
Described packet switch module is used to finish duplicating and transmitting of multicast packet, and described packet switch module comprises a plurality of first line of a couplet ports, is used for being associated with set of time-slot; Network protocol module is used to finish the processing of multicast protocol;
The time slot Cross module is used to set up the time slot interconnection between the light mouth of the described set of time-slot of described first line of a couplet port and described transmission network, the set of time-slot that makes described first line of a couplet port correspond respectively to not share the same light mouthful; And
The network management configuration module is used to realize the configuration and the cross-coupled configuration of described time slot of packet switching service (PSS).
9. system according to claim 7, it is characterized in that, described convergence network element and each described access network element establish the corresponding relation between first line of a couplet port and the multicast service port, be used for after protocol processes is finished, realize dynamic multicast configuration, described multicast service port is the transmit port of described multicast service or the receiving port of described multicast service.
10. system according to claim 8 is characterized in that, described network management configuration module is used to realize the static multicast configuration.
11. system according to claim 8, it is characterized in that, comprise at described transmission network under the situation of bidirectional orbicular, the described time slot Cross module of described convergence network element carries out concurrent processing to both direction, and the described time slot Cross module of described access network element carries out excellent receipts to both direction to be handled.
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