CN101262419B - Multicast service forward method and device - Google Patents
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- CN101262419B CN101262419B CN2008100067468A CN200810006746A CN101262419B CN 101262419 B CN101262419 B CN 101262419B CN 2008100067468 A CN2008100067468 A CN 2008100067468A CN 200810006746 A CN200810006746 A CN 200810006746A CN 101262419 B CN101262419 B CN 101262419B
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Abstract
The invention discloses a method and a device for forwarding multicast service, which pertain to the communication filed. The method comprises the following steps: service provider information belonging to a client and port information corresponding to the client are obtained and the corresponding relationship between a port and a multicast VLAN is generated according to the multicast VLAN corresponding to the service provider information; after an IGMP access request message to the client is obtained from the port, the multicast VLAN corresponding to the port is found out according to the corresponding relationship; a multicast join request message including the found multicast VLAN is forwarded to an upstream unit; a multicast data stream is forwarded to the client through the port. The device for forwarding multicast service comprises an acquisition module, a generation module, a searching module, a multicast request forwarding module and a multicast data forwarding module. The corresponding relationship between the port and the multicast VLAN is dynamically generated by the method and the device of the invention and does not need to be re-configured when users change service providers.
Description
Technical field
The present invention relates to the communications field, method and multicast service forwarding unit that particularly a kind of multicast service is transmitted.
Background technology
Multicast is a kind of important IP technology, when the certain user's demand customizing messages in the network, multicast information sender (being multicast source) only sends once this information, and it is that multicast packet is set up tree type route by multicast routing protocol, and duplicate and distributing information fork on the road a long way off.Referring to Fig. 1, suppose user B, D and E demand customizing messages, for this information successfully is transferred to user B, D and E, user B, D and E need be formed recipient's set, transmit and duplicate according to the distribution situation of each recipient in this set information of carrying out by each router in the network, thereby information is transferred to exactly recipient B, D and the E of actual needs.
Client at first needs to obtain the IP address by DHCP (Dynamic Host Configuration Protocol, DHCP) relaying to Dynamic Host Configuration Protocol server and adds multicast network when obtaining multicast information.Wherein, DHCP relay provides the transparent transmission function to the dhcp broadcast message, can be sent to the broadcasting packet of client pellucidly on the Dynamic Host Configuration Protocol server of other network segment, can be sent to the broadcasting packet of Dynamic Host Configuration Protocol server end pellucidly the client of other network segment equally.
In the real network environment, dhcp relay feature generally is to realize on certain interface of router, at this moment needs the relay address for this interface configuration IP, is used for specifying Dynamic Host Configuration Protocol server.The IP relay address is meant the IP address of Dynamic Host Configuration Protocol server specified on the equipment as DHCP relay.Behind configuration DHCP relay function on the interface of router, the dhcp broadcast message of receiving from this interface will be sent to the Dynamic Host Configuration Protocol server of appointment.
Referring to Fig. 2, the process of client application IP address is as follows:
1) after dhcp client starts and carries out the DHCP initialization, at local network broadcast transmission DHCPDISCOVER (configuring request) message;
If local network does not have Dynamic Host Configuration Protocol server, after the network equipment that then link to each other with local network, the band dhcp relay feature is received this message, suitably handle and be transmitted to Dynamic Host Configuration Protocol server appointment, on other network.
2) after Dynamic Host Configuration Protocol server is received the DHCPDISCOVER message, the information that provides according to client in the message, be client distributing IP address, and send to the DHCP relay clean culture and to carry DHCPOFFER (configuration is replied) message of IP address information, after DHCP relay is received this message, its clean culture is transmitted to dhcp client;
3) after dhcp client is received the DHCPOFFER message, extract the IP address in the message, and, after DHCP relay is received this message, its clean culture is transmitted to Dynamic Host Configuration Protocol server to DHCP relay broadcast transmission DHCPREQUEST (confirming request) message;
4) after Dynamic Host Configuration Protocol server is received the DHCPREQUEST message of dhcp client by the DHCP relay transmission, return DHCPACK (confirming response) message or DHCPNAK (refusal response) message to it by DHCP relay.
DHCP Snooping (DHCP intercepts) is exactly on two-layer equipment, and the DHCP message is monitored and handled.Two-layer equipment identification and parsing DHCP message obtain information wherein; And might insert Option82 information, upstream device is transmitted information.Wherein, the Option field in the DHCP message is the field that is used for carrying control information between client and the Dynamic Host Configuration Protocol server, and this field can be used for depositing undefined control information and parameter in some common protocol.If client has disposed Options information at the Dynamic Host Configuration Protocol server end, client can obtain the configuration information in the Options field by the DHCP message that the Dynamic Host Configuration Protocol server end is responded in application IP address.
The function difference of Options field, the object of its effect is also different, for example, Option 77 is used for client, be used for the affiliated type of identify customer end or application program, according to User Class (user type) entrained in the Option field, it is client distributing IP address and relevant configured parameter that Dynamic Host Configuration Protocol server is selected suitable address pool.Option 77 generally is configured by the user in client, and needn't dispose at server end with order.The form of Option field is as follows:
Client is after Dynamic Host Configuration Protocol server obtains the IP address, send IGMP (Internet Group Management Protocol according to the multicast router of IP address in network, Internet Group Management Protocol) message that joins request, add multicast group, Layer 2 switch is issued to multicast router with the flow of this multicast group, is forwarded to client by multicast router.
In the prior art, on two-layer equipment because there is not a multicast routing protocol, so, all send by the forms of broadcasting to the forwarding of flux of multicast.Referring to Fig. 3, Layer 2 switch can cause the significant wastage of bandwidth like this to all port duplicated multicast flows.In order to save bandwidth, configuration IGMP Snooping (IGMP snooping) function on switch SwitchA and SwitchB, know under which port and connecting client by intercepting IGMP that client sends to the multicast router message that joins request, the multicast group that client is added forms binding relationship with corresponding secondary layer switch port, when issuing flux of multicast, SwitchA and SwitchB port duplicated multicast flow to these multicast traffics of needs, compare before with configuration IGMP Snooping, on secondary layer switch port, realized the wholesale as required of flux of multicast.
In addition, layer 2-switched client access interface may belong to different VLAN (Virtual Local Area Network, VLAN), and isolate between the different VLAN, message can not intercommunication, if all duplicate a flux of multicast, also can cause the significant wastage of bandwidth for each VLAN.In order to save bandwidth, use a special M-VLAN by M-VLAN at the uplink port of multicast source correspondence, make this uplink port belong to this M-VLAN (a plurality of ports share) by configuration; Layer 2 switch joins request the IGMP that receives, and is forwarded in this M-VLAN; Multicast source is forwarded to Layer 2 switch with flux of multicast in this M-VLAN, Layer 2 switch according to the result of IGMP Snooping, copies to different access interface with flux of multicast again.The access interface that belongs to different VLAN so just can use identical M-VLAN.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following shortcoming:
Carrying out flux of multicast when wholesale, need to pass through at DSLAM (Digital Subscriber Line Access Multiplexer, multiplexer in digital user line access) corresponding relation of static configuration user port and M-VLAN or on the Layer 2 switch, realize flux of multicast wholesale to the M-VLAN clients corresponding, when client is selected different multicast service providers, must on Layer 2 switch, be configured the pairing M-VLAN of user port again, use dumbly, maintenance workload is very big.
Summary of the invention
In order to improve the flexibility that multicast service is transmitted, method and multicast service forwarding unit that the embodiment of the invention provides a kind of multicast service to transmit.Described technical scheme is as follows:
On the one hand, the method that the embodiment of the invention provides a kind of multicast service to transmit, described method comprises:
Intercept the DynamicHost configuration access request message that client sends, obtain the affiliated service provider's information of described client in the described DynamicHost configuration access request message, and obtain and receive the port information that the configuration of described DynamicHost inserts request message, according to the multicast virtual local area network of described service provider's information correspondence, generate the corresponding relation of described port and described multicast virtual local area network;
Get access to the internet group management access request message of described client from described port after, find the multicast virtual local area network corresponding with described port according to described corresponding relation;
The upstream device forwarding multicasting message that joins request, described multicast join request and comprise the described multicast virtual local area network that finds in the message;
After receiving the multicast traffic stream of described upstream equipment transmission, transmit described multicast traffic stream by described port and give described client.
On the other hand, the embodiment of the invention provides a kind of multicast service forwarding unit, and described multicast service forwarding unit comprises:
Acquisition module, be used to intercept the DynamicHost configuration access request message that client sends, and after the DynamicHost configuration that listens to described client transmission inserts request message, obtain the affiliated service provider's information of described client in the described DynamicHost configuration access request message, and obtain the port information that receives described DynamicHost configuration access request message;
Generation module is used for the multicast virtual local area network of service provider's information correspondence of obtaining according to described acquisition module, generates the corresponding relation of described port and described multicast virtual local area network;
Search module, be used for when described multicast service forwarding unit gets access to the internet group management access request message of described client from described port after, the corresponding relation that generates according to described generation module finds the multicast virtual local area network corresponding with described port;
The multicast request forwarding module is used for the upstream device forwarding multicasting message that joins request, and described multicast joins request and comprises the described multicast virtual local area network that module finds of searching in the message;
The transmitting multicast data module after being used to receive the multicast traffic stream of described upstream equipment transmission, is transmitted described multicast traffic stream by described port and is given described client.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
The embodiment of the invention is by obtaining service provider's information and the client corresponding port information under the client, M-VLAN according to service provider's information correspondence, generate the corresponding relation of port and M-VLAN, when thereby the user selects different service providers, can directly select in client, do not need to reconfigure again the M-VLAN of port correspondence, improved the flexibility that multicast service is transmitted.
Description of drawings
Fig. 1 is the schematic diagram of multicast transmission mode in the prior art;
Fig. 2 is the schematic diagram that client is obtained the IP address in the prior art to Dynamic Host Configuration Protocol server;
Fig. 3 is the schematic diagram that multicast service is transmitted in the prior art;
Fig. 4 is the flow chart of the method transmitted of the multicast service that provides of the embodiment of the invention 1;
Fig. 5 is the structural representation of the multicast service forwarding unit that provides of the embodiment of the invention 2.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention is by intercepting the DHCP request message that client sends, and the service provider's information under the identify customer end dynamically is mapped to different service providers' M-VLAN with client port, has improved the flexibility that multicast service is transmitted.
Embodiment 1
Referring to Fig. 4, the method that the embodiment of the invention provides a kind of multicast service to transmit specifically comprises:
101: client sends DHCP to Dynamic Host Configuration Protocol server and inserts request message, obtains the IP address.
DHCP inserts in the request message and carries the Option60 field, and this field is represented the information of the service provider under the client, and for example, client wants is seen the program of BTV, then the value representation BTV of Option60 field.
Client is a prior art to the process that Dynamic Host Configuration Protocol server obtains the IP address, repeats no more herein.
102: two layers of access device obtain service provider's information and the client corresponding port information under the client.
Wherein, two layers of access device are intercepted client and are inserted request message to the DHCP that Dynamic Host Configuration Protocol server sends, resolve the Option60 information in this DHCP access request message, obtain the affiliated service provider's information of client, and obtain the port information that receives DHCP access request message.
103: two layers of access device generates the corresponding relation of port and M-VLAN according to the M-VLAN of service provider's information correspondence of obtaining.
The corresponding relation of service provider's information and M-VLAN is pre-configured on two layers of access device, and two layers of access device generates the corresponding relation of port and M-VLAN according to the M-VLAN of service provider's information correspondence of obtaining.For example, receive that from port 3/0/1 DHCP inserts request message, the value of Option60 field is a BTV, and the M-VLAN of default BTV's correspondence is 1000, generates following mapping so: port 3/0/1:1000.
104: client sends the IGMP message that joins request according to the IP address that obtains to multicast router.
105: two layers of access device get access to client after the IGMP that multicast router sends joins request message, insert the multicast group information that client adds in the request message according to IGMP, generate the corresponding relation of port and multicast group information.
Wherein, two layers of access device can obtain IGMP that client the sends message that joins request according to IGMP Proxy of the prior art or Snooping function, and detailed process no longer is described in detail in detail herein.
Client comprises client and wants the multicast group information that adds in the IGMP that multicast router sends joins request message, two layers of access device gets access to IGMP and joins request to resolve behind the message and obtain client and want the multicast group information that adds, can preserve the corresponding relation of port information and this multicast group information with the form of form.
For example, multicast group information can be the MAC Address of multicast group, after two layers of access device get access to this information, adds port information and multicast group information to the multicast forwarding control table.For example, port is 3/0/1, and client wants is seen the TV programme of BTV's channel, and the MAC Address of BTV's channel place multicast group is 01005E7FFFFF, and then the multicast forwarding control table is as shown in table 1:
The control table of table 1 multicast forwarding
| Multicast group mac address | Client port |
| 01005E7FFFFF | 3/0/1 |
106: two layers of access device gets access to IGMP that client sends and joins request behind the message, finds the M-VLAN corresponding with port according to the corresponding relation of port and M-VLAN.
107: two layers of access device join request by upstream Interface upstream device forwarding multicasting, and multicast joins request and comprises the M-VLAN that finds in the message.
For example, the M-VLAN of port 3/0/1 correspondence be 1000, two layers of access device by upstream Interface upstream device forwarding multicasting VLAN is that 1000 multicast joins request.
108: after upstream equipment receives that the multicast of two layers of access device joins request, send multicast traffic stream to two layers of access device.
Wherein, after upstream equipment receives that the multicast of two layers of access device joins request, transmit this multicast to multicast source and join request, after multicast source is received request, issue multicast traffic stream to this upstream equipment; After upstream equipment was received the multicast traffic stream that multicast source issues, two layers of access device were issued in the multicast data of coming down to a lower group circulation.
After 109: two layers of access device are received the multicast traffic stream of upstream equipment transmission, flow to client by client corresponding port multicast data forwarding.
When the corresponding relation of 105 middle ports and multicast group information is kept in the multicast forwarding control table, after two layers of access device are received the multicast traffic stream of upstream equipment transmission, multicast group address according to multicast traffic stream finds the multicast traffic stream corresponding port in the multicast forwarding control table, flow to multicast group corresponding port multicast data forwarding.
110: client is received multicast traffic stream, obtains multicast services.
Further, when the service provider's information under the client changed, the value that only needs to change the Option60 field in the DHCP access request message got final product, and need not reconfigure on two layers of access device.
Further, in the present embodiment, describe as example, can also use other Option fields to carry service provider's information with service provider's information of using the Option60 field to carry under the client, for example, Option77 field, Option82 field etc.
Two layers of access device can be Layer 2 switch, DASLAM or other wireless device etc. in the present embodiment.
Be that example describes at client-side with IGMP (IPv4) agreement in the present embodiment, for MLD (Multicast ListenerDiscovery, the multicast listener discovery) (IPv6) agreement, its principle is identical with the IGMP agreement with realization, and difference only is that the MLD agreement is the IPv6 protocol stack.
Present embodiment carries service provider's information under the client by the Option60 field, two layers of access device are intercepted the DHCP access request message of client, obtain service provider's information and client corresponding port information, M-VLAN according to service provider's information correspondence, generate the corresponding relation of port and M-VLAN, when thereby the user selects different service providers, directly the information of carrying in client change Option60 field gets final product, do not need to reconfigure again the M-VLAN of the port correspondence of two layers of access device, improve the flexibility that multicast service is transmitted, and reduced the workload of plant maintenance.
Embodiment 2
Referring to Fig. 5, the embodiment of the invention provides a kind of multicast service forwarding unit, and this multicast service forwarding unit comprises:
Acquisition module is used to obtain client affiliated service provider's information and client corresponding port information;
Generation module is used for the multicast virtual local area network of service provider's information correspondence of obtaining according to acquisition module, generates the corresponding relation of port and multicast virtual local area network;
Search module, be used for when the multicast service forwarding unit gets access to the internet group management access request message of client from port after, the corresponding relation that generates according to generation module finds the multicast virtual local area network corresponding with port;
The multicast request forwarding module is used for the upstream device forwarding multicasting message that joins request, and multicast joins request to comprise in the message and searches the multicast virtual local area network that module finds;
The transmitting multicast data module after being used to receive the multicast traffic stream of upstream equipment transmission, flows to client by the port multicast data forwarding.
Further, above-mentioned acquisition module can specifically comprise:
Intercept the unit, be used to intercept the DynamicHost configuration access request message that client sends;
Acquiring unit, be used for listening to after DynamicHost configuration that client sends inserts request message intercepting the unit, obtain the affiliated service provider's information of client in the DynamicHost configuration access request message, and obtain the port information that receives DynamicHost configuration access request message.
Further, above-mentioned multicast service forwarding unit can also comprise:
The multicast generation module, be used for the multicast service forwarding unit gets access to the internet group management access request message of client from port after, insert the multicast group information that client adds in the request message according to internet group management, generate the corresponding relation of port and multicast group information;
Correspondingly, after the transmitting multicast data module specifically is used to receive the multicast traffic stream of upstream equipment transmission,, flow to client by multicast group information corresponding port multicast data forwarding according to the port of multicast generation module generation and the corresponding relation of multicast group information.
Multicast service forwarding unit in the present embodiment can be two layers of access device among the embodiment 1, promptly can be Layer 2 switch, DASLAM or other wireless device etc.
Present embodiment inserts the information that request message carries the service provider by DHCP, after intercepting DHCP that the unit listens to client and inserting request message, acquiring unit obtains service provider's information and the client corresponding port information under the client, generation module is according to the M-VLAN of service provider's information correspondence, generate the corresponding relation of port and M-VLAN, when thereby the user selects different service providers, directly the information of carrying at client change DHCP access request message gets final product, do not need to reconfigure again the M-VLAN of the port correspondence of multicast service forwarding unit, improve the flexibility that multicast service is transmitted, and reduced the workload of plant maintenance.
The invention process can realize that corresponding software can store in the storage medium that can read by the mode of software and hardware combination, for example, and in the hard disk of computer, floppy disk or the CD.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the method transmitted of a multicast service is characterized in that described method comprises:
Intercept the DynamicHost configuration access request message that client sends, obtain the affiliated service provider's information of described client in the described DynamicHost configuration access request message, and obtain and receive the port information that the configuration of described DynamicHost inserts request message, according to the multicast virtual local area network of described service provider's information correspondence, generate the corresponding relation of described port and described multicast virtual local area network;
Get access to the internet group management access request message of described client from described port after, find the multicast virtual local area network corresponding with described port according to described corresponding relation;
The upstream device forwarding multicasting message that joins request, described multicast join request and comprise the described multicast virtual local area network that finds in the message;
After receiving the multicast traffic stream of described upstream equipment transmission, transmit described multicast traffic stream by described port and give described client.
2. the method that multicast service according to claim 1 is transmitted is characterized in that, also comprises after the described internet group management that gets access to described client from described port inserts request message:
Insert the multicast group information that client adds described in the request message according to described internet group management, generate the corresponding relation of described port and described multicast group information;
Correspondingly, describedly transmit described multicast traffic stream by described port and give described client, be specially:
According to the corresponding relation of described port and described multicast group information, transmit described multicast traffic stream by described multicast group information corresponding port and give described client.
3. a multicast service forwarding unit is characterized in that, described multicast service forwarding unit comprises:
Acquisition module, be used to intercept the DynamicHost configuration access request message that client sends, and after the DynamicHost configuration that listens to described client transmission inserts request message, obtain the affiliated service provider's information of described client in the described DynamicHost configuration access request message, and obtain the port information that receives described DynamicHost configuration access request message;
Generation module is used for the multicast virtual local area network of service provider's information correspondence of obtaining according to described acquisition module, generates the corresponding relation of described port and described multicast virtual local area network;
Search module, be used for when described multicast service forwarding unit gets access to the internet group management access request message of described client from described port after, the corresponding relation that generates according to described generation module finds the multicast virtual local area network corresponding with described port;
The multicast request forwarding module is used for the upstream device forwarding multicasting message that joins request, and described multicast joins request and comprises the described multicast virtual local area network that module finds of searching in the message;
The transmitting multicast data module after being used to receive the multicast traffic stream of described upstream equipment transmission, is transmitted described multicast traffic stream by described port and is given described client.
4. multicast service forwarding unit according to claim 3 is characterized in that, described multicast service forwarding unit also comprises:
The multicast generation module, be used for described multicast service forwarding unit gets access to the internet group management access request message of described client from described port after, insert the multicast group information that client adds described in the request message according to described internet group management, generate the corresponding relation of described port and described multicast group information;
Correspondingly, after described transmitting multicast data module specifically is used to receive the multicast traffic stream of described upstream equipment transmission, according to the described port of described multicast generation module generation and the corresponding relation of described multicast group information, transmit described multicast traffic stream by described multicast group information corresponding port and give described client.
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| CN101425976B (en) * | 2008-12-09 | 2011-08-24 | 中兴通讯股份有限公司 | Method for multicast data packet forwarding control |
| CN101909010B (en) * | 2010-08-06 | 2012-10-10 | 福建星网锐捷网络有限公司 | Port configuration method and device as well as switcher equipment |
| CN102130822B (en) | 2010-08-28 | 2013-09-11 | 华为技术有限公司 | Targeted advertisement playing method, device and system |
| CN102148879A (en) * | 2010-10-22 | 2011-08-10 | 华为技术有限公司 | Port mapping method and device and communication system |
| CN109818869B (en) * | 2017-11-22 | 2021-06-04 | 北京华为数字技术有限公司 | Method for generating multicast traffic forwarding port and related equipment |
| CN110391919B (en) * | 2019-07-12 | 2021-03-23 | 杭州迪普科技股份有限公司 | Multicast traffic forwarding method and device, and electronic device |
| CN111541610A (en) * | 2020-04-21 | 2020-08-14 | 北京天融信网络安全技术有限公司 | Communication method, communication device, network equipment and computer readable storage medium |
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| CN1700676A (en) * | 2005-06-03 | 2005-11-23 | 港湾网络有限公司 | Cross-VLAN layer 2 multicast data transmission method of Ethernet switch |
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