WO2011026437A1 - 用户侧组播业务主备保护系统、方法及路由设备 - Google Patents
用户侧组播业务主备保护系统、方法及路由设备 Download PDFInfo
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- WO2011026437A1 WO2011026437A1 PCT/CN2010/076598 CN2010076598W WO2011026437A1 WO 2011026437 A1 WO2011026437 A1 WO 2011026437A1 CN 2010076598 W CN2010076598 W CN 2010076598W WO 2011026437 A1 WO2011026437 A1 WO 2011026437A1
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- routing device
- routing
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- multicast service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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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
- H04L45/22—Alternate routing
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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
- H04L45/24—Multipath
- H04L45/247—Multipath using M:N active or standby paths
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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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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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
- H04L45/58—Association of routers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0093—Point-to-multipoint
Definitions
- the present invention relates to the field of data traffic protection, and in particular, to a user side multicast service active backup protection system, method, and routing device. Background technique
- IPTV Internet Protocol Television
- Some multicast service data traffic protection schemes have been proposed in the prior art, such as active/standby protection of the multicast source.
- the multicast proxy server is connected to the multicast source primary server and the multicast source standby server respectively, and the multicast proxy server provides cooperation for the multicast source primary server and the multicast source standby server.
- the interface translates the source address of the multicast source to the same external network address and forwards the data stream of the multicast source.
- the multicast source backup server runs the multicast source backup and the multicast source backup server to implement the active/standby protection of the multicast source.
- the active/standby protection scheme of the multicast source is mainly used to solve the problem of instability of the multicast source in the prior art, and is difficult to apply to the receiving end close to the user side.
- a scheme for multicast static group backup is also proposed in the prior art.
- multicast static group information is configured on the interface of the primary router on the network side, and hotspot channels are introduced into the primary router, and are performed on the standby router.
- Manual backup Since this solution needs to be manually configured, it is impossible to dynamically back up the multicast program information that the user clicks on, and since the user information is not backed up in the standby router, the user cannot be identified and authenticated. This is difficult to protect the interests of operators.
- the object of the present invention is to provide a user-side multicast service active/standby protection system, a method, and a routing device, which can implement active/standby protection of data traffic of a user-side multicast service.
- the present invention provides a routing device, where the routing device and the at least one second routing device are both connected to the aggregation device, the routing device is a primary device, and the routing device includes: synchronous backup of user information. And a module, configured to synchronize, by using the aggregation device, user information of the multicast service to the at least one second routing device in real time.
- the present invention provides a routing device, where the routing device and the first routing device are both connected to the aggregation device, and the first routing device is a master device, and the routing device includes:
- a user information synchronization storage module configured to store user information of a multicast service synchronized in real time from the first routing device
- an active/standby switchover module configured to: when detecting that the first routing device becomes unavailable from available, select the second active device to replace the first routing device.
- the present invention provides a user-side multicast service active/standby protection system, including a first routing device and at least one second routing device; the first routing device and the at least one second routing device are both Connecting to the aggregation device; the first routing device is configured to synchronize user information of the multicast service to the at least one second routing device in real time by using the aggregation device; the at least one second routing device is configured to detect When the first routing device becomes unavailable from available, the second primary device is elected to take over the first routing device.
- the present invention provides a user-side multicast service active/standby protection method, in which a first routing device and at least one second routing device are both connected to an aggregation device, and the first routing device is a primary device.
- the method includes:
- the first routing device synchronizes user information of the multicast service to the at least one second routing device in real time by the aggregation device;
- the second primary device is selected from the at least one second routing device to replace the first routing device.
- the present invention configures the routing device as the primary and backup devices on the user side, and synchronizes the user information to the routing device in real time, thereby ensuring that the user can be identified and authenticated after the active/standby switchover.
- the invention is not affected, and the legality of the user traffic and the channel is ensured, thereby ensuring the economic benefits of the operator.
- the invention can also improve the switching speed, ensure the continuity of the service, and provide a good service experience for the user.
- FIG. 1 is a scenario diagram of an application of an active/standby protection system for a user-side multicast service according to the present invention.
- FIG. 2 is a schematic structural diagram of an embodiment of a user-side multicast service active/standby protection system according to the present invention.
- FIG. 3 is a schematic structural diagram of another embodiment of a user-side multicast service active/standby protection system according to the present invention.
- the system embodiment includes a specific structure of an embodiment of a first routing device and a second routing device.
- FIG. 4 is a schematic flowchart of an embodiment of a method for protecting a primary-side service of a user-side multicast service according to the present invention.
- FIG. 5 is a schematic flowchart diagram of another embodiment of a method for protecting a primary-side service of a user-side multicast service according to the present invention.
- FIG. 6 is a schematic flowchart diagram of still another embodiment of a method for protecting a primary-side service of a user-side multicast service according to the present invention.
- FIG. 7 is a schematic flowchart of still another embodiment of a method for performing active/standby protection of a user-side multicast service according to the present invention. detailed description
- FIG. 1 is a scenario diagram of an application of an active/standby protection system for a user-side multicast service according to the present invention.
- the user side includes a first routing device (for example, a broadband remote access server, BRAS-1) and at least one second routing device BRAS-2 as a backup device.
- BRAS-1 for example, a broadband remote access server, BRAS-1
- BRAS-2 for example, a broadband remote access server
- BRAS-2 a broadband remote access server
- BRAS-2 only one second routing device BRAS-2 is schematically illustrated.
- BRAS-3, BRAS-4, etc. may be included as backup.
- the first routing device BRAS-1 and the second routing device BRAS-2 are both connected to the routing device in the IP/MPLS core network, and the downlink is connected to the aggregation device 31, the aggregation device 32 or the aggregation device 33 on the user side, and the aggregation device is connected.
- the core switch Core Switch, CSW for short
- the core switch CSW-31 is connected to the corresponding Digital Subscriber Line Access Multiplexer (DSLAM) 41, CSW-32.
- DSLAM-42 Digital Subscriber Line Access Multiplexer
- STB Set Top Box
- STB Phone Phone-62 and PC-PC can be connected to the Digital Subscriber Line Access Multiplexer DSLAM-41 via Home Gateway (HG) 51.
- the set-top box STB-63, the telephone phone-62, and the personal computer PC-61 can perform multicast channel information on-demand via PPPoE dial-up Internet access, or can be multicasted through the Dynamic Host Configure Protocol (DHCP). On-demand.
- DHCP Dynamic Host Configure Protocol
- the network side needs to identify and authenticate the user, so in the second Need to save multicast in routing device BRAS-2 User information for the business.
- FIG. 2 is a schematic structural diagram of an embodiment of a user-side multicast service active/standby protection system according to the present invention.
- the user-side multicast service active/standby protection system 200 (the rectangular frame pointed by the arrow) includes the first routing device 1 and at least one second routing device 2 (as shown in FIG. 2 as a second routing device). Example), wherein the first routing device 1 and the at least one second routing device 2 are both connected to the aggregation device 3 (corresponding to CSW-31, CSW-2 or CSW-33 in the scenario of FIG. 1), wherein the convergence device 3 It can be CSW-31, CSW-2 or CSW-33 in the scene of Figure 1.
- the first routing device 1 is configured to synchronize the user information of the multicast service to the at least one second routing device 2 in real time by the aggregation device 3.
- At least one second routing device 2 is configured to elect the second primary device to take over the first routing device 1 when it is detected that the first routing device 1 becomes unavailable from available.
- FIG. 3 is a schematic structural diagram of another embodiment of a user-side multicast service active/standby protection system according to the present invention.
- the system embodiment includes a specific structure of an embodiment of the first routing device 1 and the second routing device 2.
- the first routing device 1 is a master device, and may include a user information synchronization backup module 11 for synchronizing the user information of the multicast service to the second routing device 2 in real time by the aggregation device, thereby ensuring the second
- the user information of the multicast service running on the first routing device 1 is always received and saved in the routing device 2, so that the second routing device 2 can implement user identification and authentication according to the user information of the multicast service during the active/standby switchover.
- the second routing device 2 does not need to interrupt the accessed multicast service, and continues to provide services for the user according to the user information of the multicast service.
- the synchronous backup mode is N+1 backup, and N is a natural number.
- the real-time synchronization function of the first routing device 1 indicates that the first routing device 1 can synchronize the user information of the updated multicast service to the second routing device 2 in time according to the update status of the user information of the multicast service stored by itself.
- the second routing device 2 can ensure that the multicast service is not interrupted due to the change of the user information, and the user can be identified and authenticated.
- the second routing device 2 may include a user information synchronization storage module 22 and a master/slave switching module 21, wherein the user information synchronization storage module 11 is configured to store users of the multicast service synchronized in real time from the first routing device 1.
- the active/standby switching module 21 can pass The existing active/standby switchover protocol implements fault detection and active/standby switchover between the first routing device 1 and the second routing device 2, such as a Virtual Router Redundancy Protocol (VRRP).
- VRRP Virtual Router Redundancy Protocol
- the first routing device 1 communicates with the at least one second routing device 2 by periodically sending a VRRP multicast packet to ensure that the second routing device 2 can know the state of the first routing device 1 in time, and the second routing device
- the active/standby switching module 21 included in the 2 periodically checks whether an advertisement message sent by the first routing device 1 is received, and if not received, it can be determined that the first routing device 1 becomes unavailable from available.
- the second routing device is selected from the at least one second routing device 2 to take over the first routing device 1.
- the second primary device continues to provide the multicast service for the user, and the first routing device 1 is switched to the standby device and is released.
- the Address Resolution Protocol (ARP) is used to update the Medium Access Control (MAC) table of the downstream aggregation device 3.
- the active/standby switchback module may be further configured to perform the active/standby negotiation with the first routing device after the first routing device is restored from unavailable to available. If the result of the negotiation is that the first routing device is the primary device, the active/standby switchback module switches the first routing device to the primary device, switches the second primary device to the standby device, and advertises the gratuitous ARP to complete the user service. cut.
- the user information batch backup module may be further included in the second routing device, and the second primary device may perform the multicast service when the first routing device is switched to the primary device. The user information is backed up in batches to the first routing device.
- the user information of the multicast service mentioned in the foregoing refers to the information of the user side related to the accessed multicast service. For example, it includes at least the MAC address of the user, and may also include multicast information of the user side, for example. : User multicast traffic statistics mode, multicast group authorization list, and so on.
- the present invention also provides an embodiment for implementing a higher switching speed, that is, in another embodiment of the second routing device, a bidirectional forwarding test (Bidirectional Forwarding) can also be set.
- the Detect (abbreviated as BFD) module can establish a bidirectional forwarding detection session (BFD session, a BFD session) between the first routing device and the at least one second routing device, and detect whether the BFD session is If the status of the BFD session is Down, it is determined that the first routing device becomes unavailable from available.
- the second routing device can complete the active/standby switchover by using the existing active/standby switching protocol (for example, VRRP protocol) through the active/standby switching module.
- the existing active/standby switching protocol for example, VRRP protocol
- the second active device may perform the active/standby negotiation with the first routing device by using the existing active/standby switching protocol (for example, VRRP), if the negotiation result is the first
- the active/standby switchback module switches the first routing device to the primary device and the second primary device to the standby device.
- the BFD protocol is a path connectivity detection protocol.
- the purpose of BFD is to provide a low overhead and short detection time for fault detection between adjacent forwarding systems.
- the BFD packet is a packet encapsulated by the UDP protocol.
- the destination UDP port number is 2784, which can be loaded into any appropriate media or network protocol.
- BFD can run on multiple levels of the system. To meet the needs of fast detection, the BFD draft specifies that the transmission interval and reception interval unit is microsecond. However, limited to the current device processing capability, most vendors' devices can only achieve milliseconds when configuring BFD, and then convert to microseconds when performing internal processing.
- the default timer is 10ms, and three consecutive failures are detected, so that the link fault can be detected up to 30ms.
- the BFD state mechanism is implemented through the three-way handshake mode. The establishment and removal of the BFD state machine uses a three-way handshake mechanism to ensure that both systems can know the state change.
- a BFD session has four states: Down, Init, Up, and AdminDown.
- the Down indicates that the session is in the Down state or just created.
- Ink indicates that the session can communicate with the peer system.
- the local end wants to make the session enter the Up state.
- Up indicates that the session has been successfully established.
- AdminDown indicates that the session is in an administrative Down state.
- the fast detection of whether the first routing device becomes available from the available routing device can reach milliseconds (for example, 100 to 200 ms), and the BFD protocol is also applied to the routing device.
- PIM Protocol Independent Multicast
- the active/standby switchover module of the second routing device is connected to the BFD module, and the active/standby switchover module of the second routing device can perform the active/standby switchover according to the unavailable state detected by the BFD module, because the first routing device
- the detection time of the unavailable state is shortened to 100 to 200 ms. Therefore, fast switching can be implemented between the first routing device and the second routing device, thereby ensuring the continuity of the multicast service. Since the switching time is very short, the user usually cannot detect the abnormality of the network, and since the user information of the multicast service is backed up in real time, the user does not need to re-online and on-demand, which not only improves the availability and multicast of the multicast service. User satisfaction can also protect the economic interests of operators.
- FIG. 4 it is a schematic flowchart of an embodiment of a method for performing active/standby protection of a user-side multicast service according to the present invention.
- the first routing device and the at least one second routing device are both connected to the aggregation device, and the first routing device is a network structure of the primary device, and the user-side multicast service active/standby protection process includes:
- Step 101 The first routing device synchronizes the user information of the multicast service to the at least one second routing device in real time by using the aggregation device.
- Step 102 The at least one second routing device selects the second primary device to replace the first routing device from the at least one second routing device when detecting that the first routing device becomes available from unavailable.
- the case where the first routing device in the embodiment is changed from unavailable to unavailable may include a failure of a link, an interface, a board, or a whole machine of the first routing device.
- the second active device needs to identify the received IGMP message of the user and send it to the IGMP protocol layer for processing. Since the user information of the multicast service has been After the backup is performed on the second active device, the user's IGMP report message can be authenticated by the user, and the user's IGMP entry is created to import the multicast traffic to the second active device.
- the first routing device synchronizes the user information of the multicast service to the second routing device in real time, and ensures that the second routing device always stores accurate user information, so that the network side can accurately identify the user.
- authentication to ensure the interests of operators, can also ensure the rapid recovery of services when switching, without interrupting the user's multicast service, and thus provide users with a good experience.
- FIG. 5 is a schematic flowchart diagram of another embodiment of a method for performing active/standby protection of a user-side multicast service according to the present invention.
- the embodiment further includes the step 100, that is, when at least two routing devices are configured on the user side, at least two routing devices configured on the user side may be paired by using an active/standby switching protocol (for example, VRRP protocol).
- an active/standby switching protocol for example, VRRP protocol.
- the first routing device can continuously update the multicast service according to the uplink/downlink of the user in step 101.
- User information and notify each second routing device in real time.
- Step 102 is similar to step 102 in FIG. 4 and will not be described again here.
- FIG. 6 is a schematic flowchart diagram of still another embodiment of a method for performing active/standby protection of a user-side multicast service according to the present invention.
- step 102 in this embodiment is specifically step 102a, that is, at least one second routing device periodically detects whether a notification message (such as a VRRP multicast packet, etc.) sent by the first routing device is received. If not received, it is determined that the first routing device becomes unavailable from available. At this time, the second primary device is selected from the at least one second routing device, and the first routing device is switched to standby.
- a notification message such as a VRRP multicast packet, etc.
- step 103a may be further included, that is, after the first routing device is restored from unavailable to available, the second active device performs primary-slave negotiation with the first routing device, if the negotiation result is first.
- the routing device functions as the primary device, the first routing device is switched to the primary device, and the second primary device is switched to the standby device.
- the second active device can also back up the user information of the multicast service to the first routing device in batches.
- the at least one second routing device when at least one second routing device detects that the first routing device becomes unavailable from available in step 102a, the at least one second routing device may also re-elect the PIM interface to select a new data forwarding. path.
- FIG. 7 is a schematic flowchart diagram of still another embodiment of a method for performing active/standby protection of a user-side multicast service according to the present invention.
- the present embodiment is different from the previous embodiment in steps 102b-103b, wherein the fault detection and fault recovery detection are performed by using the BFD protocol in steps 102b and 103b, specifically:
- Step 102b It is determined whether the BFD session established between the first routing device and the at least one second routing device is in the Down state. If the BFD session is in the Down state, the first routing device is determined to be unavailable. . When it is determined that the first routing device becomes available from unavailable, the second routing device may select the second master from the at least one second routing device by using the existing active/standby switching protocol (for example, VRRP protocol) by using the active/standby switching module. The device is used to replace the first routing device.
- the existing active/standby switching protocol for example, VRRP protocol
- Step 103b Detect whether the BFD session established between the first routing device and the second active device is in the Up state, and if the BFD between the first routing device and the second active device is detected, If the session is in the Up state, it is determined that the first routing device is restored from being available to be available.
- the second routing device can perform the active/standby negotiation with the first routing device by using the existing active/standby switching protocol (for example, VRRP).
- the first routing device functions as the primary device, and the active/standby switchback module switches the first routing device to the primary device and the second primary device to the standby device.
- the second primary device can also back up the user information of the multicast service to the first routing device in batches.
- the BFD protocol is used to quickly detect the fault, so that the second routing device on the user side can detect the state that the first routing device becomes unavailable from available, and the detection time is shortened to 100 to 200 ms. Therefore, the switching time can also be improved to ensure the continuity of the multicast service. Since the switching time is very short, the user usually cannot detect the abnormality of the network, and the user information of the multicast service is prepared in real time. Therefore, users do not need to re-launch online and on-demand, which not only improves the availability of multicast services and the satisfaction of multicast users, but also protects the economic interests of operators.
- the at least one second routing device may re-elect the PIM interface. To choose a new data forwarding path.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP10813359A EP2442475A4 (en) | 2009-09-03 | 2010-09-03 | PRIMARY AND AUXILIARY PROTECTION SYSTEM OF A MULTICAST SERVICE, USER SIDE, ROUTING METHOD AND DEVICE |
BR112012008313A BR112012008313B1 (pt) | 2009-09-03 | 2010-09-03 | sistema e método de proteção ativa/standby para serviços de multicast do lado do usuário e dispositivo de roteamento |
JP2012521953A JP5676605B2 (ja) | 2009-09-03 | 2010-09-03 | ユーザ側のマルチキャストサービスのプライマリおよびスタンバイ保護システム、方法、ならびにルーティングデバイス |
US13/354,131 US9871724B2 (en) | 2009-09-03 | 2012-01-19 | System and method of active/standby protection for user-side multicast services and routing device |
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CN200910170119.2 | 2009-09-03 | ||
CN2009101701192A CN101651553B (zh) | 2009-09-03 | 2009-09-03 | 用户侧组播业务主备保护系统、方法及路由设备 |
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US13/354,131 Continuation US9871724B2 (en) | 2009-09-03 | 2012-01-19 | System and method of active/standby protection for user-side multicast services and routing device |
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US (1) | US9871724B2 (zh) |
EP (1) | EP2442475A4 (zh) |
JP (1) | JP5676605B2 (zh) |
CN (1) | CN101651553B (zh) |
BR (1) | BR112012008313B1 (zh) |
WO (1) | WO2011026437A1 (zh) |
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CN101651553B (zh) | 2013-02-27 |
EP2442475A4 (en) | 2012-09-19 |
EP2442475A1 (en) | 2012-04-18 |
BR112012008313B1 (pt) | 2019-09-10 |
JP5676605B2 (ja) | 2015-02-25 |
US20120113799A1 (en) | 2012-05-10 |
US9871724B2 (en) | 2018-01-16 |
CN101651553A (zh) | 2010-02-17 |
BR112012008313A2 (pt) | 2016-03-22 |
JP2013500651A (ja) | 2013-01-07 |
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