CN101374075A - Method, device and system for protecting multicast source - Google Patents
Method, device and system for protecting multicast source Download PDFInfo
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Abstract
本发明涉及通信领域，尤其涉及一种组播源保护的方法、装置和系统。该方法包括：在骨干网边缘设备PE上配置至少两个伪线PW作为一个保护组；所述保护组中的每个PW接收到相同组播数据流；所述保护组中的一个PW作为工作PW，转发接收到的数据和网络组管理协议IGMP报文，所述保护组中的另外至少一个PW作为备份PW，转发IGMP协议报文；检测所述PE到组播源的链路是否正常；当检测到工作链路故障时进行主备PW切换，以保证用户的组播业务不中断。也可以采用虚拟交换实例VSI的备份保护方式。采用本发明的实施方式的组播源保护方法，可以使用更少的网络设备，进行简化的组网，而且组网上也可以更灵活。
The present invention relates to the communication field, in particular to a method, device and system for multicast source protection. The method includes: configuring at least two pseudowire PWs on the backbone network edge device PE as a protection group; each PW in the protection group receives the same multicast data flow; one PW in the protection group acts as a working PW, forwarding received data and network group management protocol IGMP messages, at least one other PW in the protection group is used as a backup PW, forwarding IGMP protocol messages; detecting whether the link between the PE and the multicast source is normal; When a working link failure is detected, the active/standby PW switchover is performed to ensure that the user's multicast service is not interrupted. The backup protection mode of the virtual switching instance VSI may also be adopted. By adopting the multicast source protection method in the implementation manner of the present invention, fewer network devices can be used to implement simplified networking, and the networking can also be more flexible.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for protecting a multicast source.
Background
In order to improve the reliability of the multicast service, the router realizes the protection function of the multicast VLAN1+1 on the basis of the copying function of the multicast VLAN. The multicast VLAN1+1 protection function implements 1+1 backup of multicast data stream through a working VLAN and a protection VLAN, and a router selects whether the working VLAN or the multicast stream of the protection VLAN is determined by an Operation Administration and Maintenance (OAM) fault detection mechanism at an ingress port of the multicast stream. And binding the continuous monitoring message CCM (continuity Check message) and the two VLANs together, wherein if the CCM is normal, the multicast flow in the VLAN is normal, and otherwise, the multicast flow is abnormal. Normally, the multicast data stream of the working VLAN is valid, and the multicast data stream of the protection VLAN is directly discarded.
In order to ensure that the multicast data stream received by the user is stable and effective, a multicast VLAN1+1 protection function may be configured. As shown in fig. 1, the devices Router a and Router B are routers, and a continuous monitoring cc (continuity check) detection mechanism of ethernet connectivity Fault management cfm (connectivity Fault management) is applied to the two routers (Router a and Router B). On Router a, VLAN 3 is a multicast VLAN, and VLAN 4 and VLAN 5 are user VLANs. VLAN 4 and VLAN 5 should be configured on Router B as multicast VLAN, and then a protection group can be further configured, thereby realizing the protection function of multicast 1+ 1.
Router a implements forwarding of data stream of multicast VLAN 3 in user VLAN 4 and user VLAN 5. Router B selects to receive a multicast data stream of a VLAN according to the detection result of the CCM data stream, and then forwards the effective multicast data stream to the user VLAN 100 and the user VLAN 200.
IGMP Snooping is mainly used at the edge of a metropolitan area network, and can be applied to typical multicast application scenarios such as IPTV (internet protocol television), video conference, and the like from the service perspective. However, the requirement that the multicast source needs multilink protection is more applicable to the scene of unidirectional data stream such as IPTV, in this case, the multicast source is usually located at one end of the city, and the users are distributed throughout the metropolitan area network. A Virtual Private LAN Service (VPLS) is usually arranged on a network between a multicast source and a multicast user, and a multicast VLAN1+1 protection function is configured, so that the networking of fig. 1 may be evolved into a network structure shown in fig. 2, and 6 devices are used in the middle, which results in an increase in networking cost.
Disclosure of Invention
The embodiment of the invention provides a method for protecting a multicast source, which solves the problem that the networking mode adopting multicast source protection in the current communication network is complex.
One embodiment of the invention for solving the technical problem is a method for protecting a multicast source, which comprises the steps of configuring at least two pseudo wires PW as a protection group, wherein the protection group is positioned between the multicast source and a receiver; each PW in the protection group receives the same multicast data stream; one PW in the protection group is used as a working PW to forward received data and a network group management protocol IGMP message, and at least one other PW in the protection group is used as a backup PW to forward the IGMP message; and when the link reaching the multicast source through the working PW fails, switching the main PW and the standby PW.
In another embodiment, the present invention provides a method for protecting a multicast source, including configuring at least two VSIs as a protection group, the protection group being located between the multicast source and a receiver; each VSI in the protection group receives the same multicast data stream; one VSI in the protection group is used as a working VSI to forward received data and a network group management protocol IGMP message, and at least one other VSI in the protection group is used as a backup VSI to forward the IGMP message; and when the link reaching the multicast source through the working VSI fails, switching the main VSI and the standby VSI.
Another embodiment of the present invention to solve the above technical problem is an apparatus for protecting a multicast source, comprising:
the multicast source protection method of the embodiment of the invention can use less network equipment to carry out simplified networking and can be more flexible in networking.
Drawings
Fig. 1 is a schematic diagram of a multicast source protection method in the prior art;
fig. 2 is a schematic diagram of another multicast source protection method in the prior art; (ii) a
Fig. 3 is a networking diagram of a PW-based multicast source protection method according to an embodiment of the present invention;
fig. 4 is a networking diagram of a PW-based multicast source protection method according to another embodiment of the present invention;
fig. 5 is a networking diagram of a VSI-based multicast source protection method according to an embodiment of the present invention;
fig. 6 is a networking diagram of a VSI-based multicast source protection method according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a multicast source protection apparatus according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a network structure for implementing multicast source protection according to an embodiment of the present invention.
Detailed Description
The following describes the implementation of the present invention with reference to specific embodiments.
IGMP Snooping (multicast data forwarding is realized by intercepting IGMP messages) operates in the two layers of the router, namely a link layer, and the output port information of the multicast messages is maintained by intercepting the multicast protocol messages sent between the upper layer router and the host, so that the forwarding of the multicast data messages is managed and controlled, and the two-layer multicast is realized.
The multicast source protection method of the embodiment of the invention can be a PW (Pseudo Wire) -based multicast source protection method, which mainly comprises the steps of configuring a pair of PWs on PE (provider edge) equipment as a protection group, wherein the protection group is positioned between a multicast source and a receiver (such as the PE equipment); each PW can receive the same multicast data stream simultaneously or successively; one PW in the protection group is used as a working PW to forward an IGMP protocol message, and multicast data is forwarded according to a two-layer multicast forwarding table; another PW in the protection group is used as a backup PW, the received data is discarded, and an IGMP protocol message is forwarded; configuring Eth-OAM on PE to detect whether the link from the local terminal to the multicast source is normal; and when the Eth-OAM detects that the working link fails, switching the main PW and the standby PW to ensure that the multicast service of the user is not interrupted.
Please refer to fig. 3, which is a networking diagram of a PW-based multicast source protection method according to an embodiment of the present invention. As shown in fig. 3, PE1, PE2, and PE3 belong to the same VPLS network, establish the same VSI, PE1 and PE2 establish PW _1, PE1 and PE3 establish PW _2, PE1 configures PW _2 as a backup tunnel of PW _1, and PE1 configures and detects whether links passing through PW _1 and PW _2 to Router1 are normal. Multicast data from a multicast source is duplicated at Router1 into PW _1 of PE2 and PW _2 of PE3, respectively. PE1 receives the two copies of data simultaneously or sequentially, selects one of them to forward to the user, and discards the other. Assume that the data of PW _1 is selected in the initial state. If PE2 fails, a link from PW _1 to Router1 is detected to fail on PE1, and PE1 reselects to receive data transmitted from PW _2 at this time, so that the user application is not affected. Therefore, the protection function of the multicast source can be arranged on the PE equipment, two pieces of equipment are reduced, and networking is simplified.
As shown in fig. 4, PE1, PE2, and PE3 belong to the same VPLS network, establish the same VSI, PE1 and PE2 establish PW _1, PE1 and PE3 establish PW _2, PE1 configures PW _2 as a backup channel of PW _1, and PE1 configures and detects whether links to Router1 respectively passing through PW _1 and PW _2 are normal. Two independent multicast sources 1 and 2 send identical multicast data to PW _1 of PE2 and PW _2 of PE3 respectively. The two data are received simultaneously or sequentially at PE1, one of which is selected for forwarding to the user and the other is discarded. Assume that the data for PW _1 is initially selected. If PE2 fails, it is detected at PE1 that the link from PW _1 to Router1 fails, and PE1 reselects to receive the data transmitted from PW _2, so as to ensure that the user application is not affected. As shown in fig. 4, the reliability is higher by using two independent multicast sources 1 and 2 for data transmission.
In the embodiment of the method for protecting a multicast source based on a PW, two or more PWs may be configured to form a protection group when configuring a PW protection group, and the configuration is not limited to be deployed on a PE of a backbone network edge device, and may also be deployed on a device with a similar function; configuring Eth-OAM on PE to detect whether the link from the local end to the multicast source is normal or not can be realized by detecting whether the working PW works normally or not, and correspondingly, when Eth-OAM detects that the working link fails, switching between the main PW and the standby PW is performed, or when the working PW fails, switching between the main PW and the standby PW is performed. The backbone edge device PE may be a carrier edge router or other device with similar functionality.
When more than two PWs are configured to form a protection group, determining a working PW, and the rest of the PWs are backup PWs, if a link connected with a multicast source through the working PW fails, selecting one of the backup PWs as a new working PW according to a certain preset strategy, for example, the backup PWs are preset with priorities, and when the master-backup switching occurs, the backup PW with the high priority is preferentially used as the new working PW; or, when the working PW fails, a new working PW may be reselected according to the load condition and/or the resource condition of each backup PW.
When a VPLS network is deployed in a network convergence layer, a router supports an IGMP Snooping function under a VSI (Virtual Switch Instance), and a router also supports the IGMP Snooping function in a VPLS over TE network. In the ethernet VPLS service environment, the PE device maintains a virtual Switch instance vsi (virtual Switch instance). The virtual switch instance is essentially a two-layer forwarding table unique to each customer VPLS. Provider PE (Provider Edge Device) devices create independent VSI tables based on forwarding information needed for ethernet frame exchange within a particular VPLS VPN. MAC (Media Access Control) address learning can be realized by the VSI of the PE. When there is new forwarding information, the MAC address is updated.
The multicast source protection method of the embodiment of the invention can be multicast source protection based on VSI, and mainly comprises the steps of configuring a pair of VSIs on PE equipment as a protection group, wherein the protection group is positioned between a multicast source and a receiver (such as the PE equipment); each VSI may receive the same multicast data stream; one VSI in the protection group is used as a working VSI, an IGMP protocol message is forwarded, and multicast data is forwarded according to a two-layer multicast forwarding table; another VSI in the protection group is used as a backup VSI, the received data are discarded, and an IGMP protocol message is forwarded; configuring Eth-OAM on PE to detect whether the link from the local terminal to the multicast source is normal; and when the Eth-OAM detects that the working link fails, switching the main VSI and the standby VSI, and ensuring that the multicast service of the user is not interrupted.
Fig. 5 shows an implementation manner of a multicast source protection method based on VSI according to an embodiment of the present invention, where VSI _1 is established between PE1 and PE2, VSI _2 is established between PE1 and PE3, VSI _2 is configured on PE1 as a backup channel of VSI _1, and meanwhile, PE1 is configured to detect whether links to Router1 respectively via VSI _1 and VSI _2 are normal. The multicast data from the multicast source is duplicated on Router1 and enters VSI _1 of PE2 and VSI _2 of PE3 respectively. The two data are received on the PE1 simultaneously or successively, one of the two data is selected to be forwarded to the user, and the other data is discarded. Assume that data from VSI _1 is initially selected.
If PE2 fails, PE1 detects that a link from VSI _1 to Router1 fails, and PE1 reselects to receive data transmitted from VSI _2 at the moment, so that user application is not affected.
Another embodiment of the multicast source protection method based on VSI according to the embodiment of the present invention is shown in fig. 6, where VSI _1 is established between PE1 and PE2, VSI _2 is established between PE1 and PE3, VSI _2 is configured on PE1 as a backup channel of VSI _1, and whether links of PE2 and PE3 are normal is detected from PE 1. Two independent multicast sources 1, 2 send identical multicast data into VSI _1 of PE2 and VSI _2 of PE3, respectively. The two data are received on the PE1 simultaneously or successively, one of the two data is selected to be forwarded to the user, and the other data is discarded. Assume that initially PE1 selects data for VSI _ 1.
If PE2 fails, link VSI _1 of PE2 is detected to fail on PE1, and at this time, PE1 reselects to receive data transmitted from VSI _2, so as to ensure that user application is not affected.
The multicast source protection method of the embodiment of the invention can use less network equipment to carry out simplified networking and can be more flexible in networking.
In the embodiment of the multicast source protection method based on the VSI, two or more VSIs may be configured to form a protection group when configuring the VSI protection group, and the configuration is not limited to be deployed on the edge device PE of the backbone network, and may also be deployed on devices with similar functions; configuring Eth-OAM on PE to detect whether the link from the local end to the multicast source is normal or not can also be realized by detecting whether the working VSI works normally, and correspondingly, when Eth-OAM detects that the working link fails, switching between the primary and secondary VSIs is performed, or when it detects that the working VSI fails. The backbone edge device PE may be a carrier edge router or other device with similar functionality.
When more than two VSIs are configured to form a protection group, determining a working VSI, and the rest are backup VSIs, if a link connected with a multicast source through the working VSI fails, selecting one of the backup VSIs as a new working VSI according to a certain preset strategy, for example, the backup VSIs preset priorities, and when the main-backup switching occurs, preferentially taking the backup VSI with high priority as the new working VSI; alternatively, when a working VSI fails, a new working VSI may be reselected according to the load condition and/or resource condition of each backup VSI.
Fig. 7 is a schematic structural diagram of an apparatus for protecting a multicast source according to an embodiment of the present invention. The apparatus for protecting a multicast source in fig. 7 includes:
at least two connections between the multicast source and the receiver, the at least two connections forming a protected group;
each connection in the protection group receives the same multicast data stream;
one connection in the protection group is used as a working connection for forwarding received data and a network group management protocol IGMP message, and the other connection in the protection group is used as a backup connection for forwarding the IGMP message;
and when the link reaching the multicast source through the working connection fails, switching the main connection and the standby connection.
Preferably, the connection is a pseudowire PW or a virtual switch instance VSI.
Preferably, the receiving party is a PE.
Preferably, the multicast source is one or more.
Fig. 8 shows a system for implementing multicast source protection, which includes a multicast source, the device for protecting the multicast source, and a receiver, where the receiver is a backbone edge device PE; the receiver is connected with the multicast source through the device for protecting the multicast source.
Preferably, the connection is a pseudowire PW or a virtual switch instance VSI.
Preferably, the receiving party is a PE.
Preferably, the multicast source is one or more.
The multicast source protection method of the embodiment of the invention can use less network equipment to carry out simplified networking and can be more flexible in networking.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention and without departing from the technical spirit of the present invention should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
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| CNA2008100682359A CN101374075A (en) | 2008-06-30 | 2008-06-30 | Method, device and system for protecting multicast source |
| PCT/CN2009/072195 WO2010000172A1 (en) | 2008-06-30 | 2009-06-09 | Method, system, receiving end device and multicast source device for multicast protection |
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| CNA2008100682359A CN101374075A (en) | 2008-06-30 | 2008-06-30 | Method, device and system for protecting multicast source |
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| WO2010000172A1 (en) * | 2008-06-30 | 2010-01-07 | 华为技术有限公司 | Method, system, receiving end device and multicast source device for multicast protection |
| WO2010020126A1 (en) * | 2008-08-19 | 2010-02-25 | 华为技术有限公司 | Method, device and system for transmitting data in vpls network |
| CN102025541A (en) * | 2010-12-08 | 2011-04-20 | 中兴通讯股份有限公司 | Method and system for realizing multicast protection |
| CN102025629A (en) * | 2010-12-10 | 2011-04-20 | 中兴通讯股份有限公司 | Method, device and system for realizing multicast service |
| CN102035665A (en) * | 2009-09-25 | 2011-04-27 | 中兴通讯股份有限公司 | Protection method and device for point-to-multipoint pseudowires (P2MP PW) |
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| CN101789879B (en) * | 2009-12-30 | 2013-01-16 | 中兴通讯股份有限公司 | Dynamic maintenance method and device for related link circuits |
| CN102316014A (en) * | 2010-07-01 | 2012-01-11 | 杭州华三通信技术有限公司 | Load sharing method and router under hierarchical virtual dedicated local area network service environment |
| CN102316014B (en) * | 2010-07-01 | 2015-01-21 | 杭州华三通信技术有限公司 | Load sharing method and router under hierarchical virtual dedicated local area network service environment |
| CN102025541A (en) * | 2010-12-08 | 2011-04-20 | 中兴通讯股份有限公司 | Method and system for realizing multicast protection |
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| WO2012079399A1 (en) * | 2010-12-15 | 2012-06-21 | 中兴通讯股份有限公司 | Multiplex section protection switching method for multiple element network system and inter network elements |
| CN102201999B (en) * | 2011-06-13 | 2017-09-22 | 中兴通讯股份有限公司 | A kind of method and system for realizing multicast service load sharing |
| CN102299846A (en) * | 2011-08-19 | 2011-12-28 | 杭州华三通信技术有限公司 | Method for transmitting BFD (Bidirectional Forwarding Detection) message and equipment |
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| CN102547819A (en) * | 2012-01-06 | 2012-07-04 | 华为技术有限公司 | Method for solving problem of double streams under 1+1 scene |
| CN102547819B (en) * | 2012-01-06 | 2014-07-30 | 华为技术有限公司 | Method for solving problem of double streams under 1+1 scene |
| CN102739529A (en) * | 2012-06-18 | 2012-10-17 | 中兴通讯股份有限公司 | Method and device for protecting pseudo wire protection group |
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| CN111726244A (en) * | 2016-11-28 | 2020-09-29 | 华为技术有限公司 | Transmission method and apparatus for operating, managing and maintaining OAM data |
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| CN108234358A (en) * | 2017-12-29 | 2018-06-29 | 新华三技术有限公司 | A kind of multicast message transmission method, device and machine readable storage medium |
| CN108234358B (en) * | 2017-12-29 | 2021-09-21 | 新华三技术有限公司 | Multicast message transmission method, device and machine readable storage medium |
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