CN101247252A - Method, device and system for multicast fast heavy-route - Google Patents
Method, device and system for multicast fast heavy-route Download PDFInfo
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- CN101247252A CN101247252A CNA2008100655440A CN200810065544A CN101247252A CN 101247252 A CN101247252 A CN 101247252A CN A2008100655440 A CNA2008100655440 A CN A2008100655440A CN 200810065544 A CN200810065544 A CN 200810065544A CN 101247252 A CN101247252 A CN 101247252A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/16—Multipoint routing
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Abstract
The present invention discloses a method of multicasting fast heavy-route, which includes: multicasting distribute tree is established after message of user adding is received; received multicasting stream is transmitted to said user by the multicasting distribute tree; the routing device DR is executed malfunction detection; when the DR fault is tested, the multicasting distribute tree transmits the multicasting stream. The present invention also discloses device and system of multicasting fast heavy-route. using the invention embodiment, BDR establishs multicasting distribute tree, multicasting stream arrives DR and BDR, BDR upgrades to DR and transmits received multicasting stream after BDR tests DR fault, thereby quick recovery multicasting service is realized.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to the methods, devices and systems of the quick heavy-route of a kind of multicast.
Background technology
Multicasting technology is at first used in network layer and is grown up.Along with the continuous development of network, mutual various data, voice and video information gets more and more in the network on the one hand, and service such as emerging in addition ecommerce, web conference, online auction, video request program, remote teaching is risen gradually.These services have proposed requirement to Information Security, paid property, the network bandwidth.For the problem of these single-points to multiple spot, multicasting technology has solved this problem effectively, has realized the efficient data transmission of network mid point to multiple spot, in a large number conserve network bandwidth, reduction offered load.Utilize the multicast feature of network that some new value-added services can be provided easily.
The IP multicast protocol mainly contains the internet group management protocol that is used for host registration and is used for the multicast routing protocol that the multicast routing is transmitted.Between recipient's main frame and multicast router, usually adopt internet group management protocol IGMP (Internet Group Membership Protocol), this protocol definition set up and safeguard the mechanism of multicast member relation between main frame and the router.Move multicast routing protocol between the multicast router, multicast routing protocol be used for setting up and safeguard multicast path by, and correctly, forwarding multicasting stream efficiently.
PIM (Protocol Independent Multicast) is called Protocol Independent Multicast, and the expression multicast path is by irrelevant with unicast routing protocol, as long as unicast routing protocol can produce route table items.PIM utilizes existing singlecast router information, multicast message is carried out reversing paths transmit RPF (Reverse PathForwarding) inspection, thereby create the multicast routing table item, makes up multicast distribution tree.Fig. 1 is a prior art PIM multicast network schematic diagram, as shown in Figure 1, Protocol Independent Multicast-Dense Mode PIM-SM (ProtocolIndependent Multicast-Dense Mode) realizes that the core of multicast forwarding is structure and safeguards shared tree RPT (Rendezvous Point Tree), select a certain router as public root node, be called convergent point RP (Rendezvous Point), with RP is root, and multicast member is that the multicast distribution tree of leaf is called RPT.At user side, connect user's routing device, be called and specify routing device DR (Designated Router), DR initiates to add by the RP to this multicast group correspondence, sets up RPT.Multicast source is sent to RP to data, after data have arrived RP, multicast data flow is replicated and passes to the user along RPT, when arriving the DR that connects the user, data can trigger the foundation of shortest path tree SPT (Shortest PathTree), initiated to add to multicast source by DR, set up SPT, SPT just triggers the switching of RPT to SPT after setting up, multicast data flow afterwards just issues by SPT, until the user.
In real network, in order to improve reliability, the user is by two routing device incoming multicast networks, select one according to the PIM-SM consultation and be DR, another is for backing up specified circuit by equipment B DR (BackDesignated Router), initiate to add to RP and multicast source by DR, set up RPT and SPT.
The inventor finds that there is following shortcoming at least in above-mentioned prior art: when DR breaks down, BDR detects the DR fault, and BDR upgrades to DR, rebulids multicast distribution tree, and multicast data flow is forwarded to the user according to the multicast distribution tree that rebulids, thereby recovers multicast service.This process has several seconds to tens seconds usually, causes the multicast data flow short interruption, causes and has a strong impact on carrying out business that IPTV, video conference etc. have relatively high expectations in real time.
Summary of the invention
For fast quick-recovery multicast service, improve the reliability of multicast service, the embodiment of the invention provides the methods, devices and systems of the quick heavy-route of a kind of multicast.
On the one hand, the embodiment of the invention provides the method for the quick heavy-route of a kind of multicast, comprising:
After receiving the message of user's adding, set up multicast distribution tree;
Receive the multicast data flow that is sent to described user by described multicast distribution tree;
To specifying routing device DR to carry out fault detect;
When detecting described DR fault, transmit described multicast data flow by described multicast distribution tree.
On the other hand, the embodiment of the invention also provides the device of the quick heavy-route of a kind of multicast, comprising:
The unit is set up in the path, after being used to receive the message of user's adding, sets up multicast distribution tree;
The multicast data flow receiving element is used to receive the multicast data flow that is sent to described user;
Fault detection unit is used for DR is carried out fault detect, detect the DR fault after, the notice retransmission unit transmit described multicast data flow;
Retransmission unit is used for transmitting described multicast data flow by described multicast distribution tree.
On the other hand, the embodiment of the invention also provides the system of the quick heavy-route of a kind of multicast, comprising:
First routing device is used for setting up first multicast distribution tree after the message that receives user's adding, receives the multicast data flow that is sent to described user, transmits described multicast data flow by described first multicast distribution tree;
Secondary route equipment is used for setting up second multicast distribution tree after the message that receives described user's adding, receives the multicast data flow that is sent to described user; Described first routing device is carried out fault detect, when detecting the described first via, transmit described multicast data flow by described second multicast distribution tree by equipment fault.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages: BDR sets up multicast distribution tree, and multicast data flow had both arrived DR, also arrive BDR, after BDR detects the DR fault, upgrade to DR, thereby realize fast quick-recovery multicast service, greatly improved the reliability of multicast service.
Description of drawings
Fig. 1 is a prior art PIM multicast network schematic diagram;
The process chart of the method for the quick heavy-route of multicast that Fig. 2 provides for the embodiment of the invention;
The process chart of the method for the quick heavy-route of multicast that Fig. 3 provides for another embodiment of the present invention;
The device schematic diagram of the quick heavy-route of multicast that Fig. 4 provides for the embodiment of the invention.
Embodiment
At the multicast network that adopts the PIM-SM agreement, Fig. 2 is the process chart of the method for the quick heavy-route of multicast that provides of the embodiment of the invention, and as shown in Figure 2, the method for the quick heavy-route of multicast that the embodiment of the invention provides comprises:
201, select DR and BDR;
The user is linked into multicast network by two routing devices, selects wherein one by competition and is DR, and another be BDR, and the rule of selecting DR and SDR can be just or according to routing device IP address size etc. according to user configured routing device priority.
202, DR and BDR initiate to add to RP, set up RPT;
After DR and BDR receive the message that the user adds, all initiate to add, between DR and the RP, all set up RPT between BDR and the RP to RP.
203, DR and BDR initiate to add to multicast source, set up SPT;
After multicast data flow arrives DR and BDR by the RPT tree, DR and BDR initiate to add to multicast source, set up SPT, finish the switching of RPT, after multicast data flow is forwarded to DR and BDR, when not detecting the DR fault to SPT, be responsible for the multicast data flow of receiving is transmitted to the user by DR, it is invalid that the outgoing interface state of BDR is changed to, and directly abandons the multicast data flow of receiving, the operating state of BDR monitoring DR.
204, BDR detects the DR fault, forwarding multicasting stream;
BDR carries out fault detect to DR, and BDR upgrades to DR after detecting the DR fault, and the outgoing interface state is changed to effectively, transmits the multicast data flow of receiving.
For instance, describedly carrying out fault detect, can be to detect BFD (Bidirectional Forwaring Detection) by two-way forwarding to carry out quick fault testing, and BFD is a kind of fast detection mechanism of low expense, detects fault usually in 30ms; Also can carry out fault detect by other detection means.
Source specified protocol independent multicast PIM-SSM (Protocol Independent Multicast-Source-Specific Multicast) agreement, it is the simplification of PIM-SM agreement, when the user adds multicast group with regard to the IP address in designated multicast source, DR directly initiates to add to multicast source, set up SPT on the way, so just do not need to set up RPT, the process of having avoided the RPT tree to switch to the SPT tree.At the multicast network that adopts the PIM-SSM agreement, the process chart of the method for the quick heavy-route of multicast that Fig. 3 provides for another embodiment of the present invention, as shown in Figure 3, the method for the quick heavy-route of multicast that another embodiment of the present invention provides comprises:
301, select DR and BDR;
The user is linked into multicast network by two routing devices, selects wherein one by competition and is DR, and another be BDR, and the rule of selecting DR and BDR can be just or according to routing device IP address size etc. according to user configured routing device priority.
302, DR and BDR initiate to add to multicast source, set up SPT;
After DR and BDR receive the message that the user adds, all initiate to add to multicast source, set up SPT, after multicast data flow is forwarded to DR and BDR, when the DR operate as normal, to be responsible for the multicast data flow of receiving is transmitted to the user by DR, it is invalid that the outgoing interface state of BDR is changed to, directly abandon the multicast data flow of receiving, the operating state of BDR monitoring DR.
303, BDR detects the DR fault, forwarding multicasting stream;
BDR carries out fault detect by detection means to DR, and BDR upgrades to DR after detecting the DR fault, and the outgoing interface state is changed to effectively, transmits the multicast data flow of receiving.
For instance, describedly carrying out fault detect by detection means, can be to carry out quick fault testing by BFD, also can be to carry out fault detect by other detection means.
In the embodiment of the invention, the user also can be linked into multicast network by many routing devices, selects wherein one by competition and is DR, and other are BDR, after the DR fault, select routing device again and upgrade to DR from BDR.
As shown in Figure 4, the embodiment of the invention also provides the device of the quick heavy-route of a kind of multicast, at the network that adopts the PIM agreement, when according to user configured routing device priority height or according to routing device IP address size etc., when described device was chosen to be BDR, described device comprised:
For instance, the described multicast distribution tree of setting up comprises: initiate to add to multicast source, and set up SPT between the multicast source;
At the multicast network that adopts the PIM-SM agreement, also comprise before described the adding: initiate to add to RP, and set up RPT between the RP to the multicast source initiation;
Multicast data flow receiving element 403 is used to receive the multicast data flow that is sent to described user;
Further, described multicast data flow receiving element can also be used for directly abandoning the multicast data flow of receiving when the DR operate as normal.
Further, described device can also comprise:
Multicast adds unit 401, is used to receive the message that the user adds, and makes it add multicast network according to joining request of described user.
The embodiment of the invention also provides the system of the quick heavy-route of a kind of multicast, comprising:
First routing device is used for setting up first multicast distribution tree after the message that receives user's adding, receives the multicast data flow that is sent to described user, transmits described multicast data flow by described first multicast distribution tree; Secondary route equipment is used for setting up second multicast distribution tree after the message that receives described user's adding, receives the multicast data flow that is sent to described user; Described first routing device is carried out fault detect, when detecting the described first via, transmit described multicast data flow by described second multicast distribution tree by equipment fault.
For instance, the described multicast distribution tree of setting up comprises: initiate to add to multicast source, and set up SPT between the multicast source; At the multicast network that adopts the PIM-SM agreement, also comprise before described the adding: initiate to add to RP, and set up RPT between the RP to the multicast source initiation.Described first routing device being carried out fault detect, can be to carry out quick fault testing by BFD, also can be to carry out fault detect by other detection means.
If the fault recovery of first routing device, competition again between first routing device and the secondary route equipment is selected one again and is DR, and another is BDR.
Routing device in the embodiment of the invention can be a router, also can be other equipment with routing function.The embodiment of the invention is set up multicast distribution tree by BDR, multicast data flow had both arrived DR, also arrive BDR, after BDR detects the DR fault, upgrade to DR and realized fast quick-recovery multicast service, switching only needs a few tens of milliseconds from the DR fault to multicast data flow, the basic perception of user less than, greatly improved the reliability of multicast service.
The embodiment of the invention or its part can be stored in the computer-readable medium, this computer-readable medium can be the medium that comprises, stores, passes on, propagates or transmit computer program, described computer program is the program of use instruction with operation system and device, system or equipment that the embodiment of the invention was provided, or the program relevant with this instruction.This computer-readable medium can be electronics, magnetic, electromagnetism, optics, infrared or semi-conductive system, device, equipment, propagation medium or computer storage.
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 (10)
1, the method for the quick heavy-route of a kind of multicast is characterized in that, comprising:
After receiving the message of user's adding, set up multicast distribution tree;
Receive the multicast data flow that is sent to described user by described multicast distribution tree;
To specifying routing device DR to carry out fault detect;
When detecting described DR fault, transmit described multicast data flow by described multicast distribution tree.
2, the method for the quick heavy-route of multicast as claimed in claim 1 is characterized in that, also comprises: when not detecting described DR fault, described multicast data flow is abandoned.
3, the method for the quick heavy-route of multicast as claimed in claim 1 is characterized in that, describedly comprises specifying routing device DR to carry out fault detect: detect BFD by two-way forwarding described appointment routing device DR is carried out fault detect.
As the method for the quick heavy-route of the arbitrary described multicast of claim 1-3, it is characterized in that 4, the described multicast distribution tree of setting up comprises: initiate to add to multicast source, set up shortest path tree SPT.
5, the method for the quick heavy-route of multicast as claimed in claim 4 is characterized in that, and is described to multicast source initiation adding, sets up shortest path tree SPT and also comprises before:
Initiate to add to convergent point RP, set up shared tree RPT.
6, the method for the quick heavy-route of multicast as claimed in claim 1 is characterized in that, also comprises before the described multicast data flow of described forwarding: the outgoing interface state is changed to effectively.
7, the device of the quick heavy-route of a kind of multicast is characterized in that, comprising:
The unit is set up in the path, after being used to receive the message of user's adding, sets up multicast distribution tree;
The multicast data flow receiving element is used to receive the multicast data flow that is sent to described user;
Fault detection unit is used for DR is carried out fault detect, detect the DR fault after, the notice retransmission unit transmit described multicast data flow;
Retransmission unit is used for transmitting described multicast data flow by described multicast distribution tree.
8, the device of the quick heavy-route of multicast as claimed in claim 7 is characterized in that, the described multicast distribution tree of setting up comprises: initiate to add to multicast source, and set up SPT between the multicast source;
At the multicast network that adopts the PIM-SM agreement, also comprise before described the adding: initiate to add to RP, and set up RPT between the RP to the multicast source initiation.
9, as the device of the quick heavy-route of the arbitrary described multicast of claim 7-8, it is characterized in that, further comprise: multicast adds the unit, is used to receive the message that the user adds, and makes it add multicast network according to joining request of described user.
10, the system of the quick heavy-route of a kind of multicast is characterized in that, comprising:
First routing device is used for setting up first multicast distribution tree after the message that receives user's adding, receives the multicast data flow that is sent to described user, transmits described multicast data flow by described first multicast distribution tree;
Secondary route equipment is used for setting up second multicast distribution tree after the message that receives described user's adding, receives the multicast data flow that is sent to described user; Described first routing device is carried out fault detect, when detecting the described first via, transmit described multicast data flow by described second multicast distribution tree by equipment fault.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100655440A CN101247252A (en) | 2008-03-10 | 2008-03-10 | Method, device and system for multicast fast heavy-route |
| PCT/CN2009/070433 WO2009111958A1 (en) | 2008-03-10 | 2009-02-16 | Multicast fast rerouting method, device and system |
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| CNA2008100655440A CN101247252A (en) | 2008-03-10 | 2008-03-10 | Method, device and system for multicast fast heavy-route |
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| CN101247252A true CN101247252A (en) | 2008-08-20 |
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| CNA2008100655440A Pending CN101247252A (en) | 2008-03-10 | 2008-03-10 | Method, device and system for multicast fast heavy-route |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009111958A1 (en) * | 2008-03-10 | 2009-09-17 | 华为技术有限公司 | Multicast fast rerouting method, device and system |
| CN101841478A (en) * | 2010-04-27 | 2010-09-22 | 北京星网锐捷网络技术有限公司 | Route equipment switching method and route equipment |
| CN102299847A (en) * | 2011-08-19 | 2011-12-28 | 北京星网锐捷网络技术有限公司 | Method, apparatus and system for switching of multicast distribution trees, source equipment and objective equipment |
| CN102377584A (en) * | 2010-08-12 | 2012-03-14 | 盛科网络（苏州）有限公司 | Method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode) |
| CN102611566A (en) * | 2011-12-16 | 2012-07-25 | 华为技术有限公司 | Method and device for recovering customer service |
| CN103139612A (en) * | 2011-12-01 | 2013-06-05 | 苏州达联信息科技有限公司 | Method of managing dynamic network distribution trees of video live broadcast distribution network |
| WO2016177241A1 (en) * | 2015-07-07 | 2016-11-10 | 中兴通讯股份有限公司 | Method and device for selecting backup designated router and processing fault of designated router |
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| DE102010034604A1 (en) | 2010-08-13 | 2012-02-16 | Ziehl-Abegg Ag | Impeller for a fan |
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| KR100693052B1 (en) * | 2005-01-14 | 2007-03-12 | 삼성전자주식회사 | Apparatus and method of fast reroute for mpls multicast |
| CN101005442B (en) * | 2006-01-20 | 2012-01-11 | 华为技术有限公司 | Re-routing method |
| US8004960B2 (en) * | 2006-04-28 | 2011-08-23 | Cisco Technology, Inc. | Method and apparatus for forwarding label distribution protocol multicast traffic during fast reroute |
| CN100433726C (en) * | 2006-06-21 | 2008-11-12 | 杭州华三通信技术有限公司 | Method for recovering fault of multicast, and router of multicast |
| CN101247252A (en) * | 2008-03-10 | 2008-08-20 | 华为技术有限公司 | Method, device and system for multicast fast heavy-route |
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2008
- 2008-03-10 CN CNA2008100655440A patent/CN101247252A/en active Pending
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2009
- 2009-02-16 WO PCT/CN2009/070433 patent/WO2009111958A1/en active Application Filing
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| WO2009111958A1 (en) * | 2008-03-10 | 2009-09-17 | 华为技术有限公司 | Multicast fast rerouting method, device and system |
| CN101841478A (en) * | 2010-04-27 | 2010-09-22 | 北京星网锐捷网络技术有限公司 | Route equipment switching method and route equipment |
| CN101841478B (en) * | 2010-04-27 | 2013-11-20 | 北京星网锐捷网络技术有限公司 | Route equipment switching method and route equipment |
| CN102377584A (en) * | 2010-08-12 | 2012-03-14 | 盛科网络（苏州）有限公司 | Method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode) |
| CN102299847B (en) * | 2011-08-19 | 2014-06-04 | 北京星网锐捷网络技术有限公司 | Method, apparatus and system for switching of multicast distribution trees, source equipment and objective equipment |
| CN102299847A (en) * | 2011-08-19 | 2011-12-28 | 北京星网锐捷网络技术有限公司 | Method, apparatus and system for switching of multicast distribution trees, source equipment and objective equipment |
| CN103139612A (en) * | 2011-12-01 | 2013-06-05 | 苏州达联信息科技有限公司 | Method of managing dynamic network distribution trees of video live broadcast distribution network |
| CN103139612B (en) * | 2011-12-01 | 2017-03-29 | 苏州达联信息科技有限公司 | A kind of dynamic network distribution tree management method of live video distribution |
| CN102611566A (en) * | 2011-12-16 | 2012-07-25 | 华为技术有限公司 | Method and device for recovering customer service |
| CN102611566B (en) * | 2011-12-16 | 2015-01-21 | 华为技术有限公司 | Method and device for recovering customer service |
| US9143397B2 (en) | 2011-12-16 | 2015-09-22 | Huawei Technologies Co., Ltd. | Method and apparatus for recovering service |
| WO2013086858A1 (en) * | 2011-12-16 | 2013-06-20 | 华为技术有限公司 | Method and device for recovering customer service |
| WO2016177241A1 (en) * | 2015-07-07 | 2016-11-10 | 中兴通讯股份有限公司 | Method and device for selecting backup designated router and processing fault of designated router |
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| WO2009111958A1 (en) | 2009-09-17 |
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