CN100488162C - Controlled multicasting system and method for realizing multicasting - Google Patents
Controlled multicasting system and method for realizing multicasting Download PDFInfo
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- CN100488162C CN100488162C CNB2004100968606A CN200410096860A CN100488162C CN 100488162 C CN100488162 C CN 100488162C CN B2004100968606 A CNB2004100968606 A CN B2004100968606A CN 200410096860 A CN200410096860 A CN 200410096860A CN 100488162 C CN100488162 C CN 100488162C
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Abstract
This invention discloses a controlled multicast system and a method for realizing it, in which, the system includes a separable route system, a portal certification server, an AAA certification server, a multicast source and users, the portal server, AAA server, multicast source and the users are connected with the system separately to interact information by the system, which includes a central switch sub-system, a service process sub-system and an interface sub-system, the central switch sub-system includes a transmission module, a switch control module and several switch modules, the service process sub-system includes a transmission module, a service control module, a service management module and a user module, which simplifies the controlled multicast in MAN or WAN to that of port level to reduce cost.
Description
Technical field
The present invention relates to multicasting technology, relate in particular in the communication technique field controlled multicasting system and method for realizing group broadcasting thereof based on separate type route exchange device and system.
Background technology
Under present network architecture, grouped data report will be passed through edge router-core router-edge router at least, the multi-hop route just can be finished transfer of data end to end, in addition in the metropolitan area network scope end to end packet data exchanged also passed through the multi-hop route and realized.This network exists following obstacle to the application of multicast: one is based on the multi-hop packet exchange, and end-to-end time delay is uncertain, and network performance descends, and causes the forwarding performance of multicast packet to descend; The 2nd, the application of a large amount of routers causes the whole network network topology to become totally interconnected (Mesh) structure, and number multicast routing protocol performance various, that implement complexity makes the quality of multicast be difficult to more be guaranteed.And the present magnitude that can arrive the T bit based on the route switching capacity in the data communication, on capacity, can satisfy following metropolitan area or provincial network application, on the management intensity of traffic management device, the degree of depth of formation can reach 1,000,000 magnitudes, has reached the especially characteristics such as application requirements of metropolitan area of wide area equally.Like this, the network that is made of a large amount of routers at present can be substituted by a kind of brand-new route exchange device and system, and we claim that this equipment and system are separate type routing device and system.This system functional block diagram such as Fig. 1 are made up of center switching subsystem, service process subsystem, interface subsystem, and wherein interface subsystem and service process subsystem can be same physical entity.Fig. 2 uses this system equipment to set up metropolitan area network or wide area network schematic diagram.
In addition, traditional router based on IGMP agreement (Internet Group Management Protocal) and RADIUS (Remote Authentication Dial In User Service) is not enough to the restriction that sends and the main frame of receiving multicast data is done, and this commercialization to security of multicast and multicast is totally unfavorable.Based on this, people such as Norihiro Ishikawa proposed IGMP Extended Protocol " mandate of IGMP agreement expansion in the IP multicast " (IGMP Extension for Authentication of IPMulticast in 1998, draft-ietf-idmr-igmp-auth-01.txt) multicast transmission and recipient are authenticated, (RADIUSExtension for Multicast Router authentication draft-yamanouchi-radius-ext-00.txt) has increased some attributes newly to user right with RADIUS Extended Protocol " mandate of multicast router RADIUS is expanded "; United States Patent (USP) 5959989 has proposed a kind of igmpinternet CGMP (CISCO Group ManagementProtocol) effective multicast problem that solves under the vlan environment; In addition, application number is modified model agreement HGMP and the RADIUS+ that has proposed IGMP and RADIUS in 02100445.5 the Chinese invention patent ublic specification of application, has solved the sender and recipient's the authorization identifying and the problem of controlled adding that participate in multicast to a certain extent.
Although said method can solve recipient and sender's the authorization identifying and the problem of controlled adding that participates in multicast under the existing network architecture under certain condition, but because said method all is based on the structure of existing network, as the shortcoming that existing multicast is realized, the realization of controlled multicasting will be subjected to the strong restriction of factors such as the many and complexity of multicast protocol; In addition, all adopt Ethernet switch to cooperate the realization of controlled multicasting in superincumbent two patents, will increase the complexity and the cost of maintenance, be unfavorable for the application of controlled multicasting; It is more complicated to adopt controlled multicasting equipment in the above-mentioned patent to realize especially in a metropolitan area, wide area system, is unfavorable for the demand of networking.
Summary of the invention
Purpose of the present invention is exactly at realizing shortcoming such as complexity in the background technology based on controlled multicasting under the existing network architecture, proposing a kind of controlled multicasting system and method for realizing group broadcasting thereof based on separate type route exchange device and system.
A kind of controlled multicasting system comprises separate type route system, portal server, aaa server, multicast source and user; Described portal server, aaa server, multicast source and user link to each other with the separate type route system respectively, by separate type route system interactive information; Described separate type route system comprises center switching subsystem, service process subsystem, interface subsystem, and each subsystem all has the multicast management control module that accordingly multicast data message is managed control; A described center switching subsystem connects several service process subsystems respectively, a service process subsystem connects several interface subsystems respectively, described center switching subsystem be used to finish operation, the routing table of the generation of exchanges data control command of the forwarding of data message and whole system and agreements such as distribution, interconnection or route generation, routing table synchronously and maintenances, network information collection, policy calculation, Internet resources configuration and issue, service resources configuration and distributing; Described service process subsystem is used to finish message access control, message processing, traffic management, exchange control and exchange of signaling processing, native protocol processing and assistance and finishes system-wide service resource management, network management, veneer management; Described interface subsystem is used to finish the access of message data.
Above-mentioned center switching subsystem comprises delivery module, switching control module and several switching modules, described delivery module is used to finish the transmitting-receiving of message data, Switching Module is used for the exchange of message data, and the control information of exchange is finished in switching control module; Described service process subsystem comprises delivery module, message control module, service management module and line module, and described line module is used for message access control, message processing, traffic management, exchange control and exchange of signaling to be handled; Described service management module is used for that native protocol is handled and system-wide service resource management is finished in assistance and to the applied resource management of line module; Described message control module is used for network management and veneer management; And line module and delivery module be configured and supervise; Described delivery module is responsible for finishing the transmitting-receiving of message data; Described line module further comprises exchange processing sub, traffic management submodule and message processing sub.
The method of realizing group broadcasting of above-mentioned multi-cast system comprises the following steps:
Step 1, user add multi-cast system:
1.1 the user inserts according to the interface application that the portal server provides, aaa server carries out access authentication; If by authenticating, then the separate type route system allows user port to insert, and aaa server begins accounting access and carries out next step multicast authority authentication, otherwise announcement user access makes mistakes;
1.2 user applies adds multicast group, aaa server adds purview certification.By then carrying out next step, otherwise announcement user right error message;
Step 2, multi-cast system carry out data forwarding:
2.1 aaa server will authenticate by the multicast exchange of management control module in the switching subsystem of information announcement center;
After 2.2 multicast exchange of management control module is carried out associative operation, user's receiving multicast data;
2.3 announcing aaa server when user port begins to receive data, the multicast interface management control module under the user in the interface subsystem begins the multicast charging;
Step 3, user withdraw from multi-cast system:
3.1 user applies withdraws from multicast group, affiliated interface subsystem stops forwarding multicast packet, announces aaa server simultaneously and stops the multicast charging;
3.2 user applies exits network, affiliated interface subsystem stops this port and inserts, and announces aaa server simultaneously and stops accounting access.
The present invention passes through the improvement to the implementation strategy of the change of traditional route exchange device form and network configuration and controlled multicasting, the network context of multicast problem and controlled multicasting implementation have on this basis been changed, the controlled multicasting problem of implementation of the whole network is simplified to the problem that controlled multicasting is realized in the route exchange device, overcome the shortcoming of controlled multicasting implementation method complexity in the prior art, improved the efficiency of service and the service quality of controlled multicasting.Adopt system of the present invention and implementation method, realize comparing with existing controlled multicasting, controlled multicasting in metropolitan area network or the wide area network is reduced to the controlled multicasting of port level, simplified the realization of controlled multicasting in metropolitan area network or wide area network greatly, reached the effect of simplifying controlled multicasting, save the resource cost in the controlled multicasting implementation procedure, improved the implementation efficiency of controlled multicasting; And because networking is convenient, this controlled multicasting based on the separate type route system realizes that relevance grade is wideer.
Description of drawings
Fig. 1 is the functional block diagram of separate type route system among the present invention;
Fig. 2 is the annexation figure of the multi-cast system that proposes of the present invention;
Fig. 3 is the controlled multicasting module distribution figure of separate type route system;
Fig. 4 is multicast user's table in the separate type route system.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the functional block diagram of separate type route system during the present invention proposes, and as shown in Figure 1, the separate type route system comprises center switching subsystem, service process subsystem, interface subsystem; A described center switching subsystem connects several service process subsystems respectively, a service process subsystem connects several interface subsystems respectively, described center switching subsystem be used to finish operation, the routing table of the generation of exchanges data control command of the forwarding of data message and whole system and agreements such as distribution, interconnection or route generation, routing table synchronously and maintenances, network information collection, policy calculation, Internet resources configuration and issue, service resources configuration and distributing; Described service process subsystem is used to finish message access control, message processing, traffic management, exchange control and exchange of signaling processing, native protocol processing and assistance and finishes system-wide service resource management, network management, veneer management; Described interface subsystem is used to finish the access of message data.Further, the center switching subsystem comprises delivery module, switching control module and several switching modules, described delivery module is used to finish the transmitting-receiving of message data, and Switching Module is used for the exchange of message data, and the control information of exchange is finished in switching control module; Described service process subsystem comprises delivery module, message control module, service management module and line module, and described line module is used for message access control, message processing, traffic management, exchange control and exchange of signaling to be handled; Described service management module is used for that native protocol is handled and system-wide service resource management is finished in assistance and to the applied resource management of line module; Described message control module is used for network management and veneer management; And line module and delivery module be configured and supervise; Described delivery module is responsible for finishing the transmitting-receiving of message data; Described line module further comprises exchange processing sub, traffic management submodule and message processing sub.
Fig. 2 is the annexation figure of the multi-cast system that proposes of the present invention.Concern as shown in Figure 2 based on physical connection between the each several part in the controlled multicasting realization system in the metropolitan area/wide area network of separate type route exchange device establishment and space structure, the controlled multicasting system that the present invention proposes, comprise the separate type route system, the portal server, aaa server, multicast source and user; Described portal server, aaa server, multicast source and user link to each other with the separate type route system respectively, by separate type route system interactive information.
Fig. 3 is the controlled multicasting module distribution figure of separate type route system, as shown in Figure 3, each subsystem all has corresponding multicast management control module in the separate type route system, and each multicast management control module manages control to the multicast data message in each subsystem respectively.
Fig. 4 is multicast user's table in the separate type route system.As shown in Figure 4, multicast user's table is divided into three grades, wherein multicast address is the unique identification of each multicast group, and service process subsystem ID is the unique identification of service process subsystem in the separate type route system, and interface subsystem ID is the unique identification of interface subsystem in the separate type route system.
Use the method for the realization multicast of above-mentioned multi-cast system, comprise the following steps:
Step 1, user add multi-cast system:
1.1 the user inserts according to the interface application that the portal server provides, aaa server carries out access authentication; If by authenticating, then the separate type route system allows user port to insert, and aaa server begins accounting access and carries out next step multicast authority authentication, otherwise announcement user access makes mistakes;
1.2 user applies adds multicast group, aaa server adds purview certification.By then carrying out next step, otherwise announcement user right error message;
Step 2, multi-cast system carry out data forwarding:
2.1 aaa server will authenticate by the multicast exchange of management control module in the switching subsystem of information announcement center;
After 2.2 multicast exchange of management control module is carried out associative operation, user's receiving multicast data;
2.3 announcing aaa server when user port begins to receive data, the multicast interface management control module under the user in the interface subsystem begins the multicast charging;
Step 3, user withdraw from multi-cast system:
3.1 user applies withdraws from multicast group, affiliated interface subsystem stops forwarding multicast packet, announces aaa server simultaneously and stops the multicast charging;
3.2 user applies exits network, affiliated interface subsystem stops this port and inserts, and announces aaa server simultaneously and stops accounting access.
In one embodiment of the invention, idiographic flow is:
The first step, user add multi-cast system:
1, the user includes the access application that inserts user name and access pin according to the interface input that the portal server provides.If authenticate by aaa server, then this user allows access and aaa server to begin to charge and enter next step, otherwise the announcement user inserts make mistakes (aaa server and user do not have corresponding relation, but are determined and announcement separate type route system by multicast content provider).
2, the user selects respective program according to the group broadcasting program list of multicast source, at first send the IGMP message to the corresponding interface subsystem, the interface subsystem loopback adds the interface and requires the user to import multicast to add ID and password, and then with user port ID, multicast address, multicast add ID and password be packaged into application information through the center switching subsystem send to aaa server (multicast add ID, password with insert user name, access pin can be identical also can be different).
3, result and application information loopback center switching subsystem,, otherwise enter next step after the aaa server authentication if not by authentication then announce the user multicast power error message.
Second step, multi-cast system carry out data forwarding:
1, the center switching subsystem of separate type route system is received the aaa server authentication by after the information, " the multicast user's table " in its multicast exchange of management control module inquiry route system:
If do not contain this multicast address in the table the separate type route system as common multicast router, multicast exchange of management control module notice multicast source is transmitted the data of this multicast address and update group broadcasting user table to user port;
If there is this multicast address still and in the corresponding list item of this multicast address not contain the affiliated service process subsystem ID of user port in the table, then the center switching subsystem arrives corresponding user port to this transmitting multicast data, and update group broadcasting user table;
Contain the service process subsystem ID under the user port in the list item of this multicast address and this multicast address correspondence but do not contain interface subsystem ID under the user port if having in the table, then the center switching subsystem notifies the multicast service management control module in this service process subsystem to transmit this multicast packet to user port, and update group broadcasting user table;
Contain the service process subsystem ID under the user port in the list item of this multicast address and this multicast address correspondence and contain interface subsystem ID under the user port if having in the table, then the center switching subsystem notifies the multicast interface management control module in this interface subsystem to transmit this multicast packet to user port, and update group broadcasting user table;
2, after user port begins to receive data, corresponding multicast interface management control module notice aaa server begins to charge, and regularly feed back connection status (cycle of interface subsystem feedback connection status is that route system is controlled), if do not connect then announcement server stops to charge.
3, after the center switching subsystem is received behind the multicast packet legitimacy of data message verified, data are transmitted (checking of legitimacy can realize by the methods such as legitimate secret of source address, destination address, multicast address or multicast content).
The 3rd step, user withdraw from multi-cast system:
1, user applies withdraws from multicast group, sends in each corresponding interface subsystem and moves back the group application.
2, each interface subsystem receive from the area under one's jurisdiction move back group application after, multicast interface management control module is moved back group application (comprising port numbers and multicast address) to this and is transmitted to corresponding aaa server, aaa server stops to charge, and this is moved back group Request Notices center switching subsystem.
3, the center switching subsystem is revised corresponding multicast user's table; If have only clauses and subclauses in the corresponding multicast address list item then this list item deletion and notice multicast source stopped to send this multicast packet in this route system, if a plurality of clauses and subclauses are arranged then delete corresponding clauses and subclauses.
4, the center switching subsystem is notified each subsystem to revise and is transmitted the data that stop to transmit to this port this multicast address accordingly when revising multicast user's table.
5, user applies exits network, and affiliated interface subsystem stops this port and inserts, and announces aaa server simultaneously and stops accounting access.
Claims (10)
1, a kind of controlled multicasting system is characterized in that comprising separate type route system, portal server, aaa server, multicast source and user; Described portal server, aaa server, multicast source and user link to each other with the separate type route system respectively, by separate type route system interactive information; Described separate type route system comprises center switching subsystem, service process subsystem and interface subsystem, and each subsystem all has the multicast management control module that accordingly multicast data message is managed control; A described center switching subsystem connects several service process subsystems respectively, a service process subsystem connects several interface subsystems respectively, described center switching subsystem be used to finish operation, the routing table of the generation of exchanges data control command of the forwarding of data message and whole system and distribution, interconnection or Routing Protocol generation, routing table synchronously and maintenances, network information collection, policy calculation, Internet resources configuration and issue and service resources configuration and distributing; Described service process subsystem is used to finish message access control, message processing, traffic management, exchange control and exchange of signaling processing, native protocol processing and assistance and finishes system-wide service resource management, network management and veneer management; Described interface subsystem is used to finish the access of data message.
2, controlled multicasting system according to claim 1, it is characterized in that: described center switching subsystem comprises delivery module, switching control module and several switching modules, described delivery module is used to finish the transmitting-receiving of data message, Switching Module is used for the exchange of data message, and the control information of exchange is finished in switching control module; Described service process subsystem comprises delivery module, message control module, service management module and line module, and described line module is used for message access control, message processing, traffic management, exchange control and exchange of signaling to be handled; Described service management module is used for that native protocol is handled and system-wide service resource management is finished in assistance and to the applied resource management of line module; Described message control module is used for network management and veneer management, and line module and delivery module are configured and supervise; Described delivery module is responsible for finishing the transmitting-receiving of data message; Described line module further comprises exchange processing sub, traffic management submodule and message processing sub.
3, the method for realizing group broadcasting of controlled multicasting system as claimed in claim 1 is characterized in that comprising the following steps:
Step 1, user add multi-cast system:
1.1 the user inserts according to the interface application that the portal server provides, aaa server carries out access authentication; If by authenticating, then the separate type route system allows user port to insert, and aaa server begins accounting access and carries out next step multicast authority authentication, otherwise announcement user access makes mistakes;
1.2 user applies adds multicast group, aaa server adds the multicast authority authentication; By then carrying out next step, otherwise announcement user multicast power error message;
Step 2, multi-cast system carry out data forwarding:
2.1 aaa server will authenticate by the multicast exchange of management control module in the switching subsystem of information announcement center;
After 2.2 multicast exchange of management control module is carried out associative operation, user's receiving multicast data;
2.3 announcing aaa server when user port begins to receive data, the multicast interface management control module under the user in the interface subsystem begins the multicast charging;
Step 3, user withdraw from multi-cast system:
3.1 user applies withdraws from multicast group, affiliated interface subsystem stops forwarding multicast packet, announces aaa server simultaneously and stops the multicast charging;
3.2 user applies exits network, affiliated interface subsystem stops this port and inserts, and announces aaa server simultaneously and stops accounting access.
4, method according to claim 3 is characterized in that the access application in the described step 1.1 comprises access user name and access pin.
5, method according to claim 4, it is characterized in that described step 1.2 specifically comprises: the user selects respective program according to the group broadcasting program list of multicast source, send the IGMP message to the corresponding interface subsystem earlier, the interface subsystem loopback adds the interface and requires the user to import multicast to add ID and password, and then user port ID, multicast address, multicast are added ID and password is packaged into application information and sends to aaa server through the center switching subsystem; After the aaa server authentication result and application information loopback center switching subsystem, if not by authentication then announce the user multicast power error message.
6, method according to claim 5 is characterized in that described multicast adds ID, multicast adding password is different with access user name, access pin.
7, method according to claim 5 is characterized in that described step 2.2 specifically comprises:
The center switching subsystem of separate type route system is received the aaa server authentication by after the information, " the multicast user's table " in its multicast exchange of management control module inquiry route system;
If do not contain this multicast address in the multicast user table, then the notice of the multicast exchange of management control module in separate type route system multicast source is transmitted the data of this multicast address and update group broadcasting user table to user port;
If there is this multicast address still and in the corresponding list item of this multicast address not contain the affiliated service process subsystem ID of user port in multicast user's table, then the center switching subsystem arrives corresponding user port to this transmitting multicast data, and update group broadcasting user table;
Contain the service process subsystem ID under the user port in the list item of this multicast address and this multicast address correspondence but do not contain interface subsystem ID under the user port if having in the multicast user table, then the center switching subsystem notifies the multicast service management control module in this service process subsystem to transmit this multicast packet to user port, and update group broadcasting user table;
Contain the service process subsystem ID under the user port in the list item of this multicast address and this multicast address correspondence and contain interface subsystem ID under the user port if having in the multicast user table, then the center switching subsystem notifies the multicast interface management control module in this interface subsystem to transmit this multicast packet to user port, and update group broadcasting user table.
8, method according to claim 3 is characterized in that also comprising in the described step 2: the center switching subsystem verifies the legitimacy of multicast packet after receiving multicast packet, checking by after again data are transmitted.
9, method according to claim 8 is characterized in that described legitimate verification verifies by the legitimate secret of source address, destination address, multicast address or multicast content.
10, method according to claim 3 is characterized in that described step 3.1 specifically comprises:
User applies withdraws from multicast group, sends to each corresponding interface subsystem and moves back the group application;
Each interface subsystem receive from the area under one's jurisdiction move back group application after, multicast interface management control module is moved back the group application to this that comprises port numbers and multicast address and is transmitted to corresponding aaa server, aaa server stops to charge, and this is moved back group Request Notices center switching subsystem; The center switching subsystem is revised corresponding multicast user's table; If corresponding multicast address has only clauses and subclauses then this list item deletion and notice multicast source to be stopped to send this multicast packet in this route system in the list item, if a plurality of clauses and subclauses are arranged then delete corresponding clauses and subclauses;
The center switching subsystem is notified each subsystem to revise and is transmitted the data that stop to transmit to this port this multicast address accordingly when revising multicast user's table.
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