CN100477635C - Transmission method and edge apparatus for multicast between fields - Google Patents
Transmission method and edge apparatus for multicast between fields Download PDFInfo
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- CN100477635C CN100477635C CNB2005101025134A CN200510102513A CN100477635C CN 100477635 C CN100477635 C CN 100477635C CN B2005101025134 A CNB2005101025134 A CN B2005101025134A CN 200510102513 A CN200510102513 A CN 200510102513A CN 100477635 C CN100477635 C CN 100477635C
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Abstract
The invention discloses a transmission method for multicast within domains to help local host and multicast resources create business connection, which comprises: on edge of the autonomous domain, the device generates and sends opposite group management protocol message to the autonomous domain with multicast resource according to received multicast route protocol packet; it translates send data to host in domain. It also discloses said edge device. In this invention, edge route on access autonomous domain realizes interactive between IGMP protocol translation unit an self multicast route protocol to represent autonomous domain and as access host for opposite.
Description
Technical field
The present invention relates to the transmission field of multicast service, particularly a kind of transmission method of multicast between fields and edge device.
Background technology
Increased popularity along with multicast service, such as: online game, Email, electronic money management etc. are based on the business of the Internet, IPTV (Internet Protocol TV particularly, IPTV) being extensive use of of emerging service such as makes the also gained popularity of multicast service of striding autonomous territory (network by an ISP operation is called an autonomous territory).Wherein, IPTV is a kind of broadband cabled television network that utilizes, and integrates multiple technologies such as the Internet, multimedia, communication, and the brand-new technology of the multiple interactive services that comprises Digital Television is provided to the domestic consumer.At the business realizing of above-mentioned multicast, must make it to share each other multicast service by coordinating the autonomous territory that different operators disposes.
Inner in autonomous territory by multicast transmission information in the territory, between different autonomous territories, to transmit information by multicast between fields.The implementation of multicast between fields mainly contains MSDP (multicast source discovery agreement)/MBGP at present
(Multicast Border Gateway Protocol) and PIM-SSM.The former utilizes the MSDP agreement to propagate multicast source action message SA, has which multicast source to use with indication, be aided with the path that MBGP selects suitable propagation multicast data flow simultaneously, but the multicast routing protocol of moving between each territory of this mode all is PIM-SM.The latter is exactly the simplification version of PIM-SM agreement in fact, removed process for registering the multicast source, inserting side operation igmpinternet is IGMPV3Lite, the URD agreement of IGMPV3 or CISCO, and the user knows the address of multicast source, directly add, realize receiving multicast business stream.
In above-mentioned two kinds of schemes, the multicast protocol of inside, different autonomous territory must be identical, and promptly multicast is the PIM-SM agreement in the territory, an autonomous territory, and multicast also must be the PIM-SM agreement in territory, the autonomous territory of Tong Xin another with it.Yet incomplete when identical for the multicast of each inside, autonomous territory, above-mentioned multicast between fields transmission just can't realize.If, then must revise configuration significantly in each autonomous territory of mandatory requirement, even update the equipment, with multicast protocol in the territory in unified each autonomous territory for realizing the multicast between the territory.
Summary of the invention
The problem to be solved in the present invention provides a kind of transmission method of multicast between fields, with the defective that can not carry out the multicast between fields transmission between the autonomous territory that solves in the prior art multicast protocol in using same area not.
For achieving the above object, the invention discloses a kind of transmission method of multicast between fields, be connected in order to assist main frame in this autonomous territory to set up multicast service with the multicast source in other autonomous territories, may further comprise the steps:
A, at this edge device place, autonomous territory, generate corresponding igmpinternet message according to the multicast routing protocol message of receiving, and send the igmpinternet message to autonomous territory, multicast source place;
B, at this edge device place, autonomous territory, the multicast group data that will be forwarded by multicast source direction main frame direction in this autonomous territory is transmitted.
The message of igmpinternet described in the steps A comprises: igmpinternet member relation report message or igmpinternet leave message;
Described igmpinternet member relation report message corresponding to the multicast path in the multicast routing protocol message by joining message, described igmpinternet leave message corresponding to the multicast path in the multicast routing protocol message by prune packet.
When the edge router in autonomous territory, multicast source place receives igmpinternet member relation report message, the multicast group in this message is collected in the tabulation; When the edge router in autonomous territory, multicast source place receives the igmpinternet leave message, with the deletion from tabulation of the multicast group in this message.
The edge router cycle in autonomous territory, multicast source place sends the general query message, with the inquiry multicast member; The edge router of playing the part of host role in the described multicast group responds inquiry by sending response message.
Described multicast routing protocol comprises: Protocol Independent Multicast-Sparse Mode PIM-SM agreement, Protocol Independent Multicast-Dense Mode PIM-DM agreement or Distance Vector Multicast Routing Protocol DVMRP.
Described igmpinternet comprises Internet Group Management Protocol IGMP or multicast listener discovery MLD agreement.
The invention also discloses a kind of edge device of realizing multicast between fields, set up multicast service with the multicast source in other autonomous territories and be connected with thinking main frame in this autonomous territory, comprise the igmpinternet converting unit in the described edge device, this unit is converted to the igmpinternet message with the multicast routing protocol message, and this igmpinternet message is sent to other autonomous territories.
The igmpinternet message comprises igmpinternet member relation report message or igmpinternet leave message;
Described igmpinternet member relation report message corresponding to the multicast path in the multicast routing protocol message by joining message, described igmpinternet leave message corresponding to the multicast path in the multicast routing protocol message by prune packet.
The edge device cycle in autonomous territory, multicast source place sends the general query message, and with the inquiry multicast member, the edge device of playing the part of host role in the described multicast group responds inquiry by sending response message.
Compared with prior art, the present invention has the following advantages:
The other side's that respectively does for oneself access main frame is looked in different autonomous territories mutually among the present invention; The edge router in autonomous territory, access side realizes that IGMP conversion unit of protocol and the multicast routing protocol of oneself link, and from one's own side's autonomous territory, serve as the role of the other side's access main frame by its representative.
Further, when edge router receives that the multicast routing protocol in this autonomous territory adds information, trigger the IGMP protocol element of oneself, send the report of IGMP member relation, tell the edge router in adjacent autonomous territory, wish to receive this multicast service; If instead receive the multicast routing protocol leave message in this autonomous territory, then trigger the IGMP protocol element of oneself, send IGMP leave message, tell the edge router in adjacent autonomous territory, do not wish receiving multicast business.By message in the autonomous territory and the conversion of IGMP message, realize the inter-domain communication in different autonomous territories.
In addition, the present invention does not need to change the multicast routing protocol and most relevant configurations in each autonomous territory, do not relate to the change of standard agreement yet, only improving the edge router in autonomous territory just can realize, therefore, provide bigger compatibility to conventional network equipment, expanded range of application of the present invention.
Description of drawings
Fig. 1 is the flow chart of basic principle of the present invention;
Fig. 2 is the network structure of a specific embodiment of the present invention;
Fig. 3 is the network structure of another specific embodiment of the present invention;
Fig. 4 is the network structure of another specific embodiment of the present invention.
Embodiment
Below we will be in conjunction with the accompanying drawings, optimum implementation of the present invention is described in detail.At first it is to be noted, the implication of the term of using among the present invention, words and claim can not only only limit to its literal and common implication and go to understand, the implication and the notion that also comprise and then conform to technology of the present invention, this is because we are as the inventor, to suitably provide the definition of term, so that the most appropriate description is carried out in our invention.Therefore, the configuration that provides in this explanation and the accompanying drawing is first-selected embodiment of the present invention, rather than will enumerates all technical characteristics of the present invention.We will recognize to also have the various equivalent scheme or the modifications that can replace our scheme.
The transmission method of multicast between fields provided by the invention is used to assist main frame in this autonomous territory to set up multicast service with the multicast source in other autonomous territories and is connected, and its basic procedure may further comprise the steps as shown in Figure 1:
S101, locate, generate corresponding igmpinternet message according to the multicast routing protocol message of receiving, and send the igmpinternet message to autonomous territory, multicast source place at this autonomous territory edge device (normally three-layer equipment, as router or three-tier switch).
S102, at this edge device place, autonomous territory, the multicast group data that will be forwarded by multicast source direction main frame direction in this autonomous territory is transmitted.
Present invention is described below in conjunction with specific embodiment, comprises autonomous territory 100 and autonomous territory 200 in network as shown in Figure 2, comprise in the autonomous territory 100 multicast source 11, with multicast source 11 direct-connected router one 2 and edge routers 13; Autonomous territory 200 comprises main frame 21, the router two 2 that is connected with main frame 21 and edge router 23.Communicate by letter with edge router 23 by edge router 13 with autonomous territory 200 in autonomous territory 100.For ease of describing, arrange here: the interface of edge router 23 adjoining edge router ones 3 is called upstream Interface, and the interface that edge router 23 connects autonomous territory 200 internal routers 22 is called downstream interface; The interface of edge router 13 adjoining edge router twos 3 is a downstream interface, and the interface that edge router 13 connects autonomous territory 100 internal routers 12 is called upstream Interface.
What suppose to move between 100 internal routers of autonomous territory is the PIM-DM multicast routing protocol, and what move between 200 internal routers of autonomous territory is the PIM-SM multicast routing protocol, and igmpinternet is that (in IPV4, igmpinternet is IGMP to IGMP; Be applied among the IPV6, igmpinternet can be corresponding multicast listener discovery MLD agreement, and the method that both realize is identical, just the applied environment difference).
In the PIM-DM territory, the router of operation PIM-DM agreement periodically sends Hello message, finds the PIM router of adjacency, carries out the judgement of leaf network, leaf router, and be responsible for electing Designated Router in multiple-access network.When multicast source began to send multicast packet, the all-network node all needed to receive data in the territory, therefore adopted " diffusion-beta pruning " (diffusion herein also can be understood as adding) mode to carry out multicast packet and transmitted.Router is to the total interface forward multicast packets except that the RPF (interface of upstream adjacent node correspondence) of multicast source correspondence on the way.If certain zone does not have multicast member in the network, the router in this zone can send beta pruning message, will be towards this regional forwarding interface beta pruning, and set up the beta pruning state, start timer simultaneously, work as timer expiry, the beta pruning state becomes forwarding state again.Wherein, the beta pruning state comprises the information of multicast source and multicast group, when multicast member having occurred in the beta pruning zone, needn't wait for that upstream beta pruning state is overtime, and initiatively upstream sends graft packet, so that the beta pruning state becomes forwarding state.
In pim-sm domain, carry out the forwarding of multicast packet by setting up multicast distribution tree, multicast distribution tree is divided into shared tree and shortest path tree, and PIM-SM finishes the foundation and the maintenance of multicast distribution tree by the adding/beta pruning mechanism that shows.
When this main frame 21 is unwilling to watch this program, then can send the IGMP leave message of corresponding group; The router two 2 that connects it will send the PIM beta pruning message of corresponding group to the multicast source direction; As a same reason, this beta pruning message must arrive edge router 23; Edge router 23 receives that the PIM prune packet from downstream interface will trigger the IGMP conversion unit of protocol sends IGMP leave message from corresponding group to edge router 13; Edge router 13 finds to have group to leave, and will send beta pruning message with corresponding flow process, blocks corresponding multicast data flow.
Improvement of the present invention only relates to edge router, i.e. edge router in this example 23.The present invention makes the group adding behavior of multicast routing protocol be converted into the group adding behavior of IGMP, and allows the group of multicast routing protocol leave behavior by increase the IGMP conversion unit of protocol in edge router, and the group that is converted into IGMP is left behavior.Edge router specific implementation method is as follows:
At first, in edge router 23, be provided with and safeguard a multicast group tabulation, this multicast list is used to store multicast group information, after the PIM-SM of the router two 2 in edge router 23 receives autonomous territory 200 joins message, trigger the IGMP conversion unit of protocol and send the corresponding IGMP member relation report message of organizing, and the multicast group in this message is stored in the multicast list to upstream Interface; Behind the PIM-SM prune packet of the router two 2 in edge router 23 receives autonomous territory 200, trigger the IGMP conversion unit of protocol and send the corresponding igmp leave message of organizing, and the multicast group in this prune packet is deleted from multicast list to upstream Interface.
Receiving IGMP general polling message from upstream Interface when edge router 13, will travel through the multicast group tabulation, is that each multicast group starts the report timer that counts down, and the time is 10 seconds.If do not receive the IGMP member relation report message of multicast group before the timer expired, then send the IGMP member relation report message of corresponding group.
When the IGMP group-specific query message of receiving from upstream Interface, can send several IGMP group-specific query messages.The edge router of playing the part of host role this moment responds inquiry by sending response message, and this edge router need be responded IGMP member relation report message in maximum response time, because the interface of edge router 13 adjoining edge routers may also connect other the main frame or the edge router of other self-control systems.
In addition, aging in order to prevent the multicast address on the edge router 23, edge router 23 needs the tabulation of periodic traversal multicast group, sends IGMP member relation report message.
Have a plurality of edge routers between the different autonomous territory among the present invention, as shown in Figure 3, comprise: autonomous territory 300 and autonomous territory 400, the router three 2, edge router 33 and the edge router 34 that comprise program source 31 in the autonomous territory 300, directly link to each other with program source 31; The router four 2, edge router 43 and the edge router 44 that comprise main frame 41 in the autonomous territory 400, directly link to each other with main frame 41; Edge router 33 links to each other with edge router 43, and edge router 34 links to each other with edge router 44.Though at this moment two autonomous territories link to each other by a plurality of edge routers, but for certain specific multicast source, really in the performance function, also has only a pair of edge router, can up transmit according to unicast routing table because the group of multicast routing protocol adds protocol massages, final the shortest that in path that only can reach is to edge router.Certainly, also might occur because autonomous intradomain router adopts multicast message to share technology and cause two edge routers all to need to make based on improved situation of the present invention.
Comprise a plurality of routers in the autonomous territory, be connected with a plurality of main frames under the router, as shown in Figure 4, comprise autonomous territory 500 and autonomous territory 600, wherein, autonomous territory 500 comprises router five 10, router five 20 and edge router 530, and router five connects main frame 511 (program source) and main frame 512 for 10 times, and router five connects main frame 521 and main frame 522 for 20 times; Autonomous territory 600 comprises router 610, router 620 and edge router 630, and router connects main frame 611 and main frame 612 for 610 times, and router connects main frame 621 and main frame 622 for 620 times; Communicate by letter with edge router 630 by edge router 530 in two autonomous territories.
The above-mentioned network system that constitutes with two autonomous territories is the reduction procedure that the present invention uses, and the present invention goes for the network environment in a plurality of autonomous territories such as three, four simultaneously.In each autonomous territory, adopt prior art to carry out multicast, just, changed the multicast transmission agreement between the territory by making edge router increase protocol conversion function.
The interface of router comprises Ethernet interface among the present invention, and POS mouth etc. can move the interface type of multicast service.
The multicast routing protocol that links with the IGMP conversion unit of protocol among the present invention is not limited to PIM-SM, also can be other agreement, such as: the DVMRP agreement.All multicast routing protocols all have group adding behavior and group to leave behavior, and this is basic Routing Protocol behavior; Reforming mode allows IGMP conversion unit of protocol and multicast routing protocol link too.
Description about the IGMP protocol processes among the present invention mainly is about IGMPV2, but be equally applicable to IGMPV1 and IGMPV3, for IGMPV1, it only can send IGMP member relation report message, and can not send leave message, when then receiving the leave message of multicast routing protocol, no longer respond general polling message and designated groups query message from edge router, it is just passable no longer to send IGMP member relation report message, and other are identical with IGMPV2.IGMPV3 has strengthened the function of IGMPV2, but those functions that strengthen and the present invention are irrelevant, handle identical with IGMPV2.
The IGMP conversion unit of protocol of mentioning except the present invention and the interlock of multicast routing protocol, also can manual static configuration IGMP group.
The present invention also provides a kind of edge router of realizing multicast between fields, set up multicast service with the multicast source in other autonomous territories and be connected with thinking main frame in this autonomous territory, comprise the igmpinternet converting unit in the described edge router, this unit is converted to the igmpinternet message with the multicast routing protocol message, and this igmpinternet message is sent to other autonomous territories.The multicast routing protocol message comprises igmpinternet member relation report message or igmpinternet leave message, correspond respectively in the multicast routing protocol message multicast path by join message and multicast path by prune packet.The edge router cycle in autonomous territory, multicast source place sends the general query message, and with the inquiry multicast member, the edge router of playing the part of host role in the described multicast group responds inquiry by sending response message.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1, a kind of transmission method of multicast between fields is connected in order to assist main frame in this autonomous territory to set up multicast service with the multicast source in other autonomous territories, it is characterized in that, may further comprise the steps:
A, at this edge device place, autonomous territory, generate corresponding igmpinternet message according to the multicast routing protocol message of receiving, and send the igmpinternet message to autonomous territory, multicast source place;
B, at this edge device place, autonomous territory, the multicast group data that will be forwarded by multicast source direction main frame direction in this autonomous territory is transmitted.
2, the transmission method of multicast between fields according to claim 1 is characterized in that the message of igmpinternet described in the steps A comprises: igmpinternet member relation report message or igmpinternet leave message;
Described igmpinternet member relation report message corresponding to the multicast path in the multicast routing protocol message by joining message, described igmpinternet leave message corresponding to the multicast path in the multicast routing protocol message by prune packet.
3, as the transmission method of multicast between fields as described in the claim 2, it is characterized in that, when the edge router in autonomous territory, multicast source place receives igmpinternet member relation report message, the multicast group in this message is collected in the tabulation; When the edge router in autonomous territory, multicast source place receives the igmpinternet leave message, with the deletion from tabulation of the multicast group in this message.
As the transmission method of multicast between fields as described in the claim 2, it is characterized in that 4, the edge router cycle in autonomous territory, multicast source place sends the general query message, with the inquiry multicast member; The edge router of playing the part of host role in the described multicast group responds inquiry by sending response message.
5, the transmission method of multicast between fields according to claim 1, it is characterized in that described multicast routing protocol comprises: Protocol Independent Multicast-Sparse Mode PIM-SM agreement, Protocol Independent Multicast-Dense Mode PIM-DM agreement or Distance Vector Multicast Routing Protocol DVMRP.
6, as the transmission method of claim 1 to 5 multicast between fields as described in each, it is characterized in that described igmpinternet comprises Internet Group Management Protocol IGMP or multicast listener discovery MLD agreement.
7, a kind of edge device of realizing multicast between fields, set up multicast service with the multicast source in other autonomous territories and be connected with thinking main frame in this autonomous territory, it is characterized in that, comprise the igmpinternet converting unit in the described edge device, this unit is converted to the igmpinternet message with the multicast routing protocol message, and this igmpinternet message is sent to other autonomous territories.
8, as the edge device of realization multicast between fields as described in the claim 7, it is characterized in that: the igmpinternet message comprises igmpinternet member relation report message or igmpinternet leave message;
Described igmpinternet member relation report message corresponding to the multicast path in the multicast routing protocol message by joining message, described igmpinternet leave message corresponding to the multicast path in the multicast routing protocol message by prune packet.
9, as the edge device of realization multicast between fields as described in the claim 7, it is characterized in that, the edge device cycle in autonomous territory, multicast source place sends the general query message, with the inquiry multicast member, the edge device of playing the part of host role in the described multicast group responds inquiry by sending response message.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1988507B (en) * | 2006-12-14 | 2011-12-21 | 华为技术有限公司 | Method, system and router for repeating multicast data |
| CN101383757B (en) * | 2007-09-03 | 2012-03-21 | 华为技术有限公司 | Multicast routing method, apparatus and system, media gateway and media gateway controller |
| CN101459596B (en) * | 2007-12-14 | 2012-07-04 | 华为技术有限公司 | Method, system and equipment for multicast data transmission |
| CN101321077B (en) * | 2008-07-18 | 2011-02-02 | 华为技术有限公司 | Reliable multicast method, provider edge upper layer device and system |
| CN102761477B (en) * | 2012-05-08 | 2016-08-03 | 中兴通讯股份有限公司 | Multicast protocol file transmitting method and device |
| CN102739532A (en) * | 2012-06-21 | 2012-10-17 | 上海斐讯数据通信技术有限公司 | Method for preventing flooding of three-layer multicast data stream |
| CN102946355A (en) * | 2012-09-29 | 2013-02-27 | 华为技术有限公司 | Multicast group processing method, DCI router and system |
| JP6078876B2 (en) * | 2013-02-13 | 2017-02-15 | パナソニックＩｐマネジメント株式会社 | Wireless communication system, wireless device, and address setting method thereof |
| CN109728922B (en) * | 2017-10-27 | 2022-08-02 | 上海乾廷网络科技有限公司 | Method and related equipment for configuring multicast link in autonomous network |
| CN108494691B (en) * | 2018-06-22 | 2021-02-26 | 新华三技术有限公司 | Multicast forwarding method and device and tunnel endpoint equipment |
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