WO2011150780A1 - 触发路由切换的方法和服务运营商侧运营商边缘设备 - Google Patents

触发路由切换的方法和服务运营商侧运营商边缘设备 Download PDF

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Publication number
WO2011150780A1
WO2011150780A1 PCT/CN2011/074829 CN2011074829W WO2011150780A1 WO 2011150780 A1 WO2011150780 A1 WO 2011150780A1 CN 2011074829 W CN2011074829 W CN 2011074829W WO 2011150780 A1 WO2011150780 A1 WO 2011150780A1
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Prior art keywords
edge device
neighbor relationship
route
side operator
relationship
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PCT/CN2011/074829
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English (en)
French (fr)
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王海波
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华为技术有限公司
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Priority to EP11789159.8A priority Critical patent/EP2613477B1/en
Publication of WO2011150780A1 publication Critical patent/WO2011150780A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/28Routing or path finding of packets in data switching networks using route fault recovery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06Management of faults, events, alarms or notifications
    • H04L41/0654Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0668Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/02Topology update or discovery
    • H04L45/04Interdomain routing, e.g. hierarchical routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/22Alternate routing

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a method for triggering route switching and a service operator side operator edge device. Background technique
  • the edge device In the communication network, not every device in the network uses equipment with high processing performance due to factors such as construction cost and modification period. Generally, for an edge device of a communication network, since the edge device needs to support relatively few functions, the edge device uses a device with relatively low processing performance, and accordingly, the routing capacity of the edge device is small.
  • the current network structure includes: User-end PE (User-end PE, UPE for short) and Service Provider-end PE (SPE).
  • UPE User-end PE
  • SPE Service Provider-end PE
  • the backbone network where the UPE is used to connect to the user terminal, the SPE is used to connect to the routing device in the backbone network, and one UPE is usually connected to multiple SPEs.
  • UPEs as edge devices of the network use devices with relatively low processing performance. Therefore, only a small number of routes are usually saved on the UPE.
  • the process of implementing the communication service based on the network structure shown in FIG. 1 mainly includes: The routing device in the backbone network advertises various routes to each SPE, and each SPE saves the received various routes; each SPE connects the UPE with the SPE. The route between the two routes is advertised to the UPE. After receiving the data of the user terminal, the UPE selects an SPE based on the default route. It is sent to the selected SPE. After receiving the data, the SPE sends the data to the backbone network according to various routes in the saved backbone network.
  • the SPE does not advertise a large number of routes in the backbone network to the UPE, but only advertises a default route to the UPE. Therefore, only a few routes are saved on the UPE, so that the edge device UPE can be configured. With the relatively low processing performance of the device, the networking requirements are met.
  • the link between the SPE and the routing device in the backbone network is faulty, so that the corresponding route cannot forward the data of the user terminal. Therefore, route switching is required.
  • the process of implementing the route switching in the prior art includes: pre-configuring a specified route in the backbone network to be monitored on each SPE; each SPE monitors the specified route; if an SPE such as SPE1 detects that the route saved by itself is not When the route is specified, the link fault of the routing device with the backbone network is determined, and the UPE is notified to cancel the default route between the SPE1 and the SPE1.
  • the UPE sends the data of the received user terminal to the SPE2 according to the default route advertised by the SPE2. Thereby, the route switching on the UPE is realized.
  • the embodiment of the invention provides a method for triggering route switching and an SPE, which can trigger a UPE to perform route switching when a link fails.
  • the UPE performs route switching.
  • a binding module configured to establish a binding relationship between the first neighbor relationship of the SPE to the routing device of the SPE and the second neighbor relationship of the SPE to the UPE;
  • a monitoring module configured to monitor whether the first neighbor relationship is interrupted
  • the triggering module when the monitoring module detects that the first neighbor relationship is interrupted, triggers the UPE corresponding to the second neighbor relationship to perform route switching.
  • the method for triggering route switching and the SPE proposed by the embodiment of the present invention utilizes the feature that the SPE needs to establish a neighbor relationship with the routing device and the UPE, and establishes a first neighbor relationship between the SPE and the routing device of the backbone network and a second neighbor of the SPE to the UPE.
  • the binding relationship of the relationship because the first neighbor relationship is interrupted, the link between the SPE and the routing device fails to communicate. Therefore, when the first neighbor relationship is interrupted, the previously established binding relationship can be linked to The second neighbor relationship triggers the UPE corresponding to the second neighbor relationship to perform route switching.
  • the UPE can be triggered to perform route switching when the link is faulty, so that the UPE can transmit data through the unfailed route, thereby improving data transmission. Reliability, which in turn improves network performance.
  • BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are used in the description of the claims Other drawings may also be obtained from these drawings without the use of creative labor.
  • FIG. 1 is a schematic diagram of a networking structure in the prior art.
  • FIG. 2 is a flowchart of a route switching method according to an embodiment of the present invention.
  • Embodiment 3 is a flowchart of a route switching method in Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural diagram of an SPE according to an embodiment of the present invention.
  • Figure 7 is a schematic structural view of Embodiment 1 of the SPE of the present invention.
  • Figure 8 is a schematic structural view of Embodiment 2 of the SPE of the present invention.
  • Figure 9 is a schematic structural view of Embodiment 3 of the SPE of the present invention.
  • Figure 10 is a schematic structural view of Embodiment 4 of the SPE of the present invention.
  • Figure 11 is a schematic structural view of Embodiment 5 of the SPE of the present invention.
  • Figure 12 is a schematic structural view of Embodiment 6 of the SPE of the present invention.
  • Figure 13 is a schematic structural view of Embodiment 7 of the SPE of the present invention.
  • Figure 14 is a schematic structural view of Embodiment 8 of the SPE of the present invention.
  • Figure 15 is a schematic structural view of Embodiment 9 of the SPE of the present invention.
  • FIG 16 is a block diagram showing the structure of an embodiment 10 of the SPE of the present invention. detailed description
  • the embodiment of the present invention provides a method for triggering route switching.
  • the method includes: Step 201: Establish a first neighbor relationship between the SPE to the routing device of the backbone network and the second neighbor relationship between the SPE and the UPE. Binding relationship.
  • Step 202 Monitor whether the first neighbor relationship is interrupted. When the first neighbor relationship is detected to be interrupted, step 203 is performed.
  • Step 203 Trigger the UPE corresponding to the second neighbor relationship to perform route switching.
  • the method for triggering route switching proposed by the embodiment of the present invention utilizes the SPE needs and The relationship between the routing device of the backbone network and the UPE to establish a neighbor relationship, and the binding relationship between the first neighbor relationship of the SPE to the routing device of the backbone network and the second neighbor relationship of the SPE to the UPE is established.
  • the link between the SPE and the routing device of the backbone network fails to communicate. Therefore, when the first neighbor relationship is interrupted, the binding relationship can be linked to the second neighbor relationship according to the previously established binding relationship, and the second neighbor relationship is triggered.
  • the UPE performs route switching, so that the UPE can transmit data through the route that has not failed, thereby improving the reliability of data transmission and thereby improving the performance of the network.
  • Manner 1 The route between the SPE and the UPE is revoked.
  • Manner 3 The priority of the route between the SPE and the UPE is lower than the priority of the route between the SPE and the UPE.
  • the method for triggering the UPE to perform route switching uses the above method to sell the route between the SPE and the UPE.
  • the process of implementing route switching in Embodiment 1 of the present invention includes:
  • Step 301 SPE1 establishes a binding relationship between the neighbor relationship of the SPE1 to the routing device of the backbone network (indicated as the neighbor relationship 1) and the neighbor relationship between the SPE1 and the UPE (recorded as the neighbor relationship 2).
  • the binding relationship between the neighbor relationship 1 and the neighbor relationship 2 is established to link to the neighbor relationship 2 by monitoring the neighbor relationship 1 in the subsequent process to trigger the route switching.
  • the specific implementation of the binding relationship between the neighbor relationship 1 and the neighbor relationship 2 may be: storing a neighbor relationship 1 and a neighbor relationship 2 in a mapping table, so that the neighbor relationship 1 can be mapped to the neighbor relationship 2.
  • SPE1 may be connected to one or more routing devices in the backbone network.
  • SPEl may establish a neighbor relationship with one or more routing devices in the backbone network.
  • SPE1 connects to two routing devices in the backbone network, namely, routing device 1 and routing device 2.
  • SPE1 establishes a neighbor relationship with routing device 1 (for convenience)
  • the neighbor relationship 1 is described as a neighbor relationship (11)
  • the SPE1 establishes a neighbor relationship 1 with the routing device 2 (for the convenience of subsequent description, the neighbor relationship 1 is described as a neighbor relationship 12)
  • the neighbor relationship 11 Both the neighbor relationship 12 can be classified as a neighbor relationship 1.
  • the established binding relationship is specifically: the neighbor relationship 1 is bound to the neighbor relationship 2, and the neighbor relationship 1 includes the neighbor relationship 11 and the neighbor relationship 12.
  • this step optionally includes:
  • the routing device 1 and the routing device 2 are the relationship between the primary routing device and the standby routing device, that is, the connection between the two routing devices and the SPE1 is the primary connection and the standby connection. Relationship, corresponding to the same path in the backbone network. In this way, when the route between the UPE and the SPE1 is subsequently switched to other routes, the primary connection and the backup connection may fail to communicate.
  • the neighbor relationship 11 and the neighbor relationship 12 in the neighbor relationship 1 are connected by using a logical relationship, such as "neighbor relationship 11 and neighbor relationship 12", and the logical relationship is used to indicate the neighbor relationship. 11 and the neighbor relationship 12 need to be interrupted at the same time to trigger subsequent route switching;
  • the routing device 1 and the routing device 2 are not the relationship between the primary routing device and the standby routing device, that is, the connection between the two routing devices and the SPE1 is not the primary connection and the backup connection. Relationship, corresponding to different paths in the backbone network. In this way, when the route between the UPE and the SPE1 is subsequently switched to another route, the connection failure between the two routing devices and the SPE1 cannot be communicated, in order to be able to communicate in the subsequent process.
  • the neighbor relationship 11 and the neighbor relationship 12 in the neighbor relationship 1 are connected by using a logical relationship, such as "neighbor relationship 11 or neighbor relationship 12".
  • a logical OR relationship is used to indicate any one of the neighbor relationship 11 and the neighbor relationship 12, which triggers subsequent route switching.
  • Step 302 SPE1 monitors whether the neighbor relationship 1 is interrupted. If yes, go to step 303. Otherwise, go back to step 302.
  • monitoring whether the neighbor relationship is interrupted is the prior art, and is not described in detail herein. However, it can be exemplified by: monitoring whether the neighbor relationship 1 is interrupted by monitoring keepalive messages or bidirectional forwarding detection protocol (BFD) packets.
  • BFD bidirectional forwarding detection protocol
  • the process in this step is specifically as follows: According to the established binding relationship, if multiple neighbor relationships 1 (neighbor relationship 11 and neighbor relationship 12) are logically connected, the route learned by SPE1 from routing device 1 and routing device 2 is the same. In the case, it is necessary to monitor whether multiple neighbor relationships 1 (neighbor relationship 11 and neighbor relationship 12) are all interrupted. If yes, perform subsequent trigger routing switching processing, otherwise, continue monitoring;
  • neighbor relationship 11 and neighbor relationship 12 are logical or connected, and the route learned by SPE1 from routing device 1 and routing device 2 is different, then only one neighbor relationship needs to be monitored. 1 (Neighbor relationship 11 or neighbor relationship 12) Is it interrupted? If yes, perform subsequent trigger routing switching processing. Otherwise, continue monitoring.
  • Step 303 SPE1 revokes the route between the UPEs corresponding to the SPE1 and the neighbor relationship 2.
  • An implementation process of this step is as follows: SPE1 sends an undo route notification to the UPE corresponding to the neighbor relationship 2.
  • the UPE After receiving the revocation route notification, the UPE revokes the route with the SPE1. After receiving the data of the user terminal, the UPE sends the route to the SPE2 through the default route to the SPE2.
  • Embodiment 1 may further include the following steps.
  • Step 304 The SPE1 receives the neighbor relationship from the backbone network. 1 Convergence completion indication.
  • the routing device 1 After the link between the SPE1 and the routing device of the backbone network, such as the routing device 1, is restored, the routing device 1 advertises the routes in the backbone network to the SPE1. After the route is advertised, the routing device is configured.
  • Step 305 SPE1 issues a recovery route notification to the UPE corresponding to the neighbor relationship 2.
  • the UPE After receiving the recovery route notification from SPE1, the UPE will resume the route with SPE1.
  • the method for triggering the UPE to perform route switching uses the foregoing mode 2 (interrupting the neighbor relationship between the SPE and the UPE).
  • the process of implementing route switching in Embodiment 2 of the present invention includes:
  • Steps 401 to 402 are the same as all descriptions of steps 301 to 302.
  • Step 403 SPE1 interrupts the neighbor relationship between SPE1 and the UPE.
  • SPE1 interrupting the neighbor relationship 2
  • TCP Transmission Control Protocol
  • the UPE can determine that the route switching needs to be performed. After receiving the data of the user terminal, the UPE sends the route to the SPE2 through the default route to the SPE2.
  • the second embodiment may further include the following steps.
  • step 404 All descriptions of step 404 are the same as all descriptions of step 304.
  • Step 405 SPE1 restores the neighbor relationship 2 with the UPE.
  • one implementation of the SPEl recovery neighbor relationship 2 is: SPE1 opens a Transmission Control Protocol TCP connection between the UPEs corresponding to the neighbor relationship 2.
  • the mode for triggering the UPE to perform the route switching is the third mode (the priority of the route between the SPE and the UPE is less than the priority of the route between the other SPE and the UPE).
  • the process of implementing route switching in Embodiment 3 of the present invention includes:
  • Steps 501 to 502 are the same as all the descriptions of steps 301 to 302.
  • Step 503 SPE1 reduces the priority of the route between the SPE1 and the UPE corresponding to the neighbor relationship 2, and is lower than the priority of the route between the SPE2 and the UPE.
  • the UPE can be selected according to the length of the as-path field in the default route advertised by the SPE. For example, in the default route advertised by SPE1.
  • the length of the as-path field (denoted as length 1) is compared with the length of the as-path field (recorded as length 2) in the default route advertised by SPE2, and the data of the user terminal is sent to the as-path field of small length.
  • the SPE is selected according to the length of the as-path field according to the length of the as-path field.
  • the process in this step is: SPE1 continues to advertise the default route to the UPE corresponding to the neighbor relationship 2, and the as-s in the default route.
  • the length of the path field is increased, and is greater than the length of the as-path field in the default route advertised by SPE2 to the UPE.
  • the UPE After the priority of the route between the SPE1 and the UPE is reduced, the UPE sends the data to the SPE2 through the default route with the higher priority between the SPE2 and the SPE2. Route switching on the UPE.
  • the third embodiment may further include the following steps.
  • Step 504 SPE1 restores the priority of the route between the SPE1 and the UPE corresponding to the neighbor relationship 2.
  • SPE1 advertises the default route to the UPE corresponding to the neighbor relationship 2, and restores the length of the as-path field in the default route to the configuration value.
  • An embodiment of the present invention further provides an SPE.
  • the SPE includes:
  • the binding module 601 is configured to establish a binding relationship between the first neighbor relationship of the SPE to the routing device of the backbone network and the second neighbor relationship between the SPE and the UPE.
  • the monitoring module 602 is configured to monitor whether the first neighbor relationship is interrupted.
  • the monitoring module 602 may include a first monitoring submodule 6021, configured to monitor whether the first neighbor relationship is interrupted by monitoring a KeepAlive message; or
  • the monitoring module 602 can include a second monitoring sub-module 6022, configured to monitor whether the first neighbor relationship is interrupted by monitoring the BFD packet.
  • the triggering module 603 includes a first triggering module 6031, and the first triggering module 6031 is configured to interrupt a route between the SPE and the UPE corresponding to the second neighbor relationship.
  • the trigger module 603 includes a second trigger module 6032, and the second trigger module 6032 is configured to interrupt the second neighbor relationship;
  • the triggering module 603 includes a third triggering module 6033, and the third triggering module 6033 is configured to reduce the priority of the route between the SPE and the UPE corresponding to the second neighbor relationship. And lower than the priority of the route between other SPEs and the UPE.
  • the first triggering module 6031 may further include a first triggering execution sub-module 901, where the first triggering execution sub-module 901 is configured to send a revocation routing notification to the UPE corresponding to the second neighbor relationship; or
  • the third trigger module 6033 includes a second trigger execution sub-module 1101, and the second trigger execution sub-module 1101 is configured to advertise a default route to the UPE corresponding to the second neighbor relationship, where the default route is in the default route.
  • the length of the as-path field is increased, and is greater than the length of the as-path field in the default route advertised by the other SPEs to the UPE.
  • the SPE may further include a convergence module 1202 and a first recovery module 1201.
  • the convergence module 1202 and the second recovery module 1301 may be further included.
  • the convergence module 1202 and the third recovery module 1401 may be further included in the SPE.
  • the convergence module 1202 is configured to receive a first neighbor relationship convergence completion indication from the backbone network.
  • the first recovery module 1201 is configured to: after the convergence module 1202 receives the first neighbor relationship convergence completion indication, issue a recovery route notification to the UPE corresponding to the second neighbor relationship; the second recovery module 1301 is configured to: After the convergence module 1202 receives the first neighbor relationship convergence completion indication, the second neighbor relationship is restored; or
  • the third recovery module 1401 is configured to: after the convergence module 1202 receives the first neighbor relationship convergence completion indication, issue the default route to the UPE corresponding to the second neighbor relationship, where the default route is The length of the as-path field is restored to the configured value.
  • the SPE may further include: a first processing module 1501, configured to separately establish the first neighbor relationship with multiple routing devices in the backbone network, After the routing device learns the same route, the SPE in the binding relationship and the multiple first neighbor relationships of the multiple routing devices are logically connected;
  • the monitoring module 602 includes a third monitoring submodule 6023 for monitoring whether all of the plurality of first neighbor relationships are interrupted.
  • the SPE may further include: a second processing module 1601, configured to separately establish the first neighbor relationship with multiple routing devices in the backbone network After learning different routes from the multiple routing devices, the binding relationship is as described in
  • the SPE uses a logical connection or a connection with multiple first neighbor relationships of the multiple routing devices
  • the monitoring module 602 includes a fourth monitoring sub-module 6024, configured to monitor whether any one of the plurality of first neighbor relationships is interrupted.
  • the embodiment of the present invention further provides a route switching system, which includes the UPE and any of the SPEs proposed in the foregoing embodiments of the present invention.

Description

触发路由切换的方法和服务运营商侧运营商边缘设备
本申请要求于 2010 年 9 月 8 日提交中国专利局、 申请号为 201010277423.X、 发明名称为 "触发路由切换的方法和服务运营商侧运营 商边缘设备" 的中国专利申请的优先权, 其全部内容通过引用结合在本申 请中。 技术领域
本发明实施例涉及通信技术, 尤其涉及触发路由切换的方法和服务运 营商侧运营商边缘设备。 背景技术
在通信网络中, 由于建设成本、 改造周期等因素影响, 网络中并非每 一台设备均使用处理性能高的设备。 通常, 对于通信网络的边缘设备, 由 于边缘设备需要支持的功能相对较少, 因此, 边缘设备会使用处理性能相 对较低的设备, 相应地, 边缘设备的路由容量就会很小。
参见图 1 , 目前的一种组网结构包括:用户侧运营商边缘设备(User-end PE, 简称: UPE )、服务运营商侧运营商边缘设备( Service Provider-end PE, 简称: SPE )和骨干网, 其中, UPE用于连接用户终端, SPE用于连接骨 干网中的路由设备, 一个 UPE通常连接多个 SPE。 UPE作为网络的边缘设 备会使用处理性能相对较低的设备, 因此, UPE上通常只保存较少的路由。
基于图 1 所示网络结构实现通信业务的过程主要包括: 骨干网中的路 由设备将各种路由发布到每一个 SPE,每一个 SPE保存接收到的各种路由; 每一个 SPE将 UPE与该 SPE之间的路由 (称为缺省路由 )发布给 UPE; 后续, UPE接收到用户终端的数据后, 根据缺省路由选择一个 SPE, 将数 据发送给所选的 SPE; SPE接收到数据后, 根据保存的骨干网中的各种路 由, 将数据发送到骨干网。
由以上描述可以看出, SPE没有将骨干网中的大量路由发布给 UPE, 而只是发布了一条缺省路由给 UPE, 因此, 保证了 UPE上只保存较少的路 由, 使得边缘设备 UPE可以釆用处理性能相对较低的设备, 满足了组网要 求。
SPE 与骨干网中路由设备之间的链路会发生故障, 使得相应的路由无 法转发用户终端的数据, 因此, 需要进行路由切换。 现有技术中实现路由 切换的过程包括:预先在每一个 SPE上配置需监控的骨干网中的指定路由; 每一个 SPE对指定路由进行监控; 如果一个 SPE比如 SPE1检测出自身保 存的路由中没有该指定路由时, 确定与骨干网路由设备的链路故障, 通知 UPE撤销与 SPE1之间的缺省路由;后续, UPE根据 SPE2发布的缺省路由 将接收到的用户终端的数据发送给 SPE2, 从而实现了 UPE上的路由切换。
但是, 在现有技术实现路由切换的过程中, 因为骨干网中的路由数量 巨大, 可达到几十万条路由, SPE 不可能对所有路由进行监控, 而只能对 预先配置的数量很少的指定路由进行监控, 这样, 就会使得非指定路由上 的链路故障时, SPE无法得知该故障, 从而无法在链路故障时触发 UPE进 行路由切换。 发明内容
本发明实施例提供触发路由切换的方法和 SPE, 在链路故障时能够触 发 UPE进行路由切换。
本发明实施例提供的触发路由切换的方法, 包括:
建立 SPE到骨干网的路由设备的第一邻居关系与所述 SPE到 UPE的第 二邻居关系之间的绑定关系;
监测所述第一邻居关系是否中断; 当监测到所述第一邻居关系中断时, 触发所述第二邻居关系对应的
UPE进行路由切换。
本发明实施例提供的 SPE, 包括:
绑定模块, 用于建立所述 SPE到骨干网的路由设备的第一邻居关系与 所述 SPE到 UPE的第二邻居关系之间的绑定关系;
监测模块, 用于监测所述第一邻居关系是否中断;
触发模块, 当所述监测模块监测到所述第一邻居关系中断时, 触发所 述第二邻居关系对应的 UPE进行路由切换。
本发明实施例提出的触发路由切换的方法和 SPE, 利用了 SPE需要与 路由设备和 UPE建立邻居关系的特点,建立 SPE到骨干网的路由设备的第 一邻居关系与 SPE到 UPE的第二邻居关系的绑定关系, 由于第一邻居关系 中断就表示 SPE与路由设备之间的链路出现故障无法通信, 因此, 在监测 到第一邻居关系中断时根据之前建立的绑定关系就能联动到第二邻居关 系, 触发第二邻居关系对应的 UPE进行路由切换, 这样, 在链路故障时就 能触发 UPE进行路由切换,从而使得 UPE能够通过未发生故障的路由传输 数据, 提高了数据传输的可靠性, 进而提高了网络的性能。 附图说明 实施例或现有技术描述中所需要使用的附图作一简单地介绍, 显而易见地, 下面描述中的附图是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1是在现有技术中一种组网结构示意图。
图 2是本发明实施例的一种路由切换方法的流程图;
图 3是本发明实施例 1中的路由切换方法的流程图;
图 4是本发明实施例 2中的路由切换方法的流程图; 图 5是本发明实施例 3中的路由切换方法的流程图;
图 6是本发明实施例的一种 SPE的结构示意图;
图 7是本发明 SPE的实施例 1的结构示意图;
图 8是本发明 SPE的实施例 2的结构示意图;
图 9是本发明 SPE的实施例 3的结构示意图;
图 10是本发明 SPE的实施例 4的结构示意图;
图 11是本发明 SPE的实施例 5的结构示意图;
图 12是本发明 SPE的实施例 6的结构示意图;
图 13是本发明 SPE的实施例 7的结构示意图;
图 14是本发明 SPE的实施例 8的结构示意图;
图 15是本发明 SPE的实施例 9的结构示意图;
图 16是本发明 SPE的实施例 10的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本 发明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描 述, 显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有作出创造性劳动前提 下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例提出了一种触发路由切换的方法,参见图 2,该方法包括: 步骤 201 : 建立 SPE到骨干网的路由设备的第一邻居关系与该 SPE到 UPE的第二邻居关系之间的绑定关系。
步骤 202: 监测所述第一邻居关系是否中断, 当监测到第一邻居关系中 断时, 执行步骤 203。
步骤 203: 触发所述第二邻居关系对应的 UPE进行路由切换。
可见, 本发明实施例提出的触发路由切换的方法, 利用了 SPE需要与 骨干网的路由设备和 UPE建立邻居关系的特点,建立 SPE到骨干网的路由 设备的第一邻居关系与该 SPE到 UPE的第二邻居关系的绑定关系,由于第 一邻居关系中断就表示该 SPE与骨干网的路由设备之间的链路出现故障无 法通信, 因此, 在监测到第一邻居关系中断时根据之前建立的绑定关系就 能联动到第二邻居关系, 触发第二邻居关系对应的 UPE进行路由切换, 从 而使得 UPE能够通过未发生故障的路由传输数据, 提高了数据传输的可靠 性, 进而提高了网络的性能。
在实际的业务实现中, 触发 UPE进行路由切换的方式有很多, 比如可 以釆用如下三种方式:
方式一、 撤销 SPE与 UPE之间的路由。
方式二、 中断 SPE与 UPE之间的邻居关系;
方式三、 使 SPE与 UPE之间路由的优先级低于其他 SPE与该 UPE之 间路由的优先级。
下面针对上述触发 UPE进行路由切换的三种方式分别举一个具体实施 例进行说明。
实施例 1 :
在该实施例 1中, 触发 UPE进行路由切换的方式釆用上述方式一 t 销 SPE与 UPE之间的路由 ) 。 参见图 1和图 3 , 以 SPE1为例, 本发明实 施例 1中实现路由切换的过程包括:
步骤 301: SPE1建立 SPE1到骨干网的路由设备的邻居关系 (记为邻 居关系 1 )与 SPE1到 UPE的邻居关系(记为邻居关系 2 )之间的绑定关系。
这里, 建立邻居关系 1与邻居关系 2的绑定关系是为了在后续过程中 能够通过对邻居关系 1的监测来联动到邻居关系 2,以触发路由切换。并且, 建立邻居关系 1与邻居关系 2的绑定关系的具体实现可以是: 在一张映射 表中保存邻居关系 1与邻居关系 2,使得邻居关系 1能够映射到邻居关系 2。
在实际的组网中, SPE1可能与骨干网中的一个或多个路由设备相连, 这样, SPEl就可能与骨干网中的一个或多个路由设备建立邻居关系 1。 针对 SPE1 与多个路由设备建立邻居关系 1 的情况, 参见图 1 , SPE1 连接骨干网中的两个路由设备即路由设备 1和路由设备 2, SPE1与路由设 备 1建立了邻居关系 1 (为便于后续描述, 将该邻居关系 1细化描述为邻居 关系 11 ) , SPE1与路由设备 2建立了邻居关系 1 (为便于后续描述, 将该 邻居关系 1细化描述为邻居关系 12 ) , 邻居关系 11和邻居关系 12都可以 归类为邻居关系 1。 相应地, 本步骤中, 建立的绑定关系具体为: 邻居关系 1与邻居关系 2绑定, 且邻居关系 1中包括邻居关系 11和邻居关系 12。
SPE1与路由设备 1和路由设备 2分别建立了邻居关系后, 会从该 2个 路由设备上学习到骨干网中的路由, 针对从该 2个路由设备学习到的路由 相同和不相同的情况, 需要区分后续触发路由切换过程的处理, 因此本步 骤中可选地包括:
如果学习到的路由相同, 表明路由设备 1和路由设备 2是主用路由设 备和备用路由设备的关系, 也就是说, 该 2个路由设备与 SPE1之间的连接 是主用连接和备用连接的关系, 对应骨干网中的同一路径。 这样, 后续触 发 UPE与 SPE1之间的路由切换到其他路由时, 应该对应上述主用连接和 备用连接都故障无法通信的情况, 为了在后续过程中能够实现此种处理, 在本步骤中, 在建立的绑定关系中, 将邻居关系 1中的邻居关系 11和邻居 关系 12使用逻辑与的关系连接, 如 "邻居关系 11 and邻居关系 12" , 使 用逻辑与的关系连接, 是为了指示邻居关系 11和邻居关系 12需同时中断, 才会触发后续的路由切换;
如果学习到的路由不相同, 路由设备 1和路由设备 2不是主用路由设 备和备用路由设备的关系, 也就是说, 该 2个路由设备与 SPE1之间的连接 不是主用连接和备用连接的关系, 对应骨干网中的不同路径。 这样, 后续 触发 UPE与 SPE1之间的路由切换到其他路由时, 应该对应该 2个路由设 备与 SPE1之间的任意一个连接故障无法通信的情况,为了在后续过程中能 够实现此种处理, 在本步骤中, 在建立的绑定关系中, 将邻居关系 1 中的 邻居关系 11和邻居关系 12使用逻辑或的关系连接,如 "邻居关系 11 or邻 居关系 12" , 使用逻辑或的关系连接, 是为了指示邻居关系 11和邻居关系 12中的任意一个中断, 都会触发后续的路由切换。
步骤 302: SPE1监测邻居关系 1是否中断, 如果是, 执行步骤 303 , 否则, 返回步骤 302。
监测邻居关系是否中断的处理是现有技术, 此处不再详细描述, 但可 以举例为: 通过监测保活( KeepAlive )报文或者双向转发检测协议( BFD ) 报文监测邻居关系 1是否中断。
本步骤过程具体为: 根据建立的绑定关系, 如果多个邻居关系 1 (邻居 关系 11和邻居关系 12 )之间是逻辑与连接, 对应 SPE1从路由设备 1和路 由设备 2学习到的路由相同的情况, 那么, 需要监测多个邻居关系 1 (邻居 关系 11和邻居关系 12 )是否全部中断, 如果是, 执行后续触发路由切换的 处理, 否则, 继续监测;
如果多个邻居关系 1 (邻居关系 11和邻居关系 12 )之间是逻辑或连接, 对应 SPE1从路由设备 1和路由设备 2学习到的路由不相同的情况, 那么, 只需要监测任意一个邻居关系 1 (邻居关系 11或者邻居关系 12 )是否中断, 如果是, 执行后续触发路由切换的处理, 否则, 继续监测。
步骤 303: SPE1撤销 SPE1与邻居关系 2对应的 UPE之间的路由。 本步骤的一种实现过程为: SPE1向邻居关系 2对应的 UPE发送撤销路 由通知。
UPE接收到撤销路由通知后, 撤销与 SPE1之间的路由, 在后续接收 到用户终端的数据后, 通过与 SPE2之间的缺省路由发送给 SPE2, 从而实 现了 UPE上的路由切换。
为了进一步保证在 SPE1与路由设备之间的链路故障恢复, 从而 SPE1 与路由设备之间的邻居关系 1恢复时, 能够恢复 UPE处的路由处理, 该实 施例 1还可以进一步包括如下步骤。
步骤 304: SPE1接收来自骨干网的邻居关系 1收敛完成指示。
在 SPE1与骨干网的路由设备比如路由设备 1之间的链路故障恢复后, 路由设备 1会向 SPE1发布骨干网中的路由, 在路由发布完成后, 路由设备
1向 SPE1发送邻居关系 1收敛完成指示,以告知路由发布完成,使得 SPE1 与路由设备 1之间的邻居关系 1恢复。
步骤 305: SPE1向邻居关系 2对应的 UPE发布恢复路由通知。
UPE接收到 SPE1发来的恢复路由通知后, 就会恢复与 SPE1之间的路 由。
实施例 2:
在该实施例 2中, 触发 UPE进行路由切换的方式釆用上述方式二(中 断 SPE与 UPE之间的邻居关系 ) 。 参见图 1和图 4, 以 SPE1为例, 本发 明实施例 2中实现路由切换的过程包括:
步骤 401〜步骤 402与步骤 301〜步骤 302的所有描述均相同。
步骤 403: SPE1中断 SPE1与 UPE之间的邻居关系 2。
这里, SPE1 中断邻居关系 2的一种实现为: SPE1 关闭与邻居关系 2 对应的 UPE之间的传输控制协议( Transmission Control Protocol,简称: TCP ) 连接。
在中断了邻居关系 2之后, UPE就可以确定需要进行路由切换, 在后 续接收到用户终端的数据后, 通过与 SPE2之间的缺省路由发送给 SPE2, 从而实现了 UPE上的路由切换。
为了进一步保证在 SPE1与路由设备之间的故障恢复, 从而 SPE1与路 由设备之间的邻居关系 1恢复时, 能够恢复 UPE处的路由处理, 该实施例 2还可以进一步包括如下步骤。
步骤 404的所有描述与步骤 304的所有描述相同。
步骤 405: SPE1恢复与 UPE之间的邻居关系 2。 这里, SPEl 恢复邻居关系 2的一种实现为: SPE1打开与邻居关系 2 对应的 UPE之间的传输控制协议 TCP连接。
实施例 3:
在该实施例 3中, 触发 UPE进行路由切换的方式釆用上述方式三 (使 SPE与 UPE之间路由的优先级氐于其他 SPE与该 UPE之间路由的优先级;)。 参见图 1和图 5 , 以 SPE1为例, 本发明实施例 3中实现路由切换的过程包 括:
步骤 501〜步骤 502与步骤 301〜步骤 302的所有描述均相同。
步骤 503: SPE1将 SPE1与邻居关系 2对应的 UPE之间的路由的优先 级降低, 且低于 SPE2与该 UPE之间路由的优先级。
在 UPE根据各个 SPE发布的缺省路由来选择接收用户终端数据的 SPE 时, 可以根据 SPE发布的缺省路由中的 as-path字段的长度来选择, 比如, 将 SPE1发布的缺省路由中的 as-path字段的长度 (记为长度 1 )与 SPE2发 布的缺省路由中的 as-path字段的长度 (记为长度 2 )进行比较, 将用户终 端的数据发送给长度小的 as-path字段对应的 SPE。
基于上述 UPE根据 as-path字段长度来选择接收数据的 SPE的特点, 可选地,本步骤的过程为: SPE1向邻居关系 2对应的 UPE继续发布缺省路 由, 将缺省路由中的 as-path字段的长度增加, 且大于 SPE2向该 UPE发布 的缺省路由中 as-path字段的长度。
在将 SPE1与 UPE之间路由的优先级降低之后, UPE在后续接收到用 户终端的数据后,就会通过与 SPE2之间的优先级较高的缺省路由将数据发 送给 SPE2 , 从而实现了 UPE上的路由切换。
为了进一步保证在 SPE1与路由设备之间的故障恢复, 从而 SPE1与路 由设备之间的邻居关系 1恢复时, 能够恢复 UPE处的路由处理, 该实施例 3还可以进一步包括如下步骤。
步骤 504的所有描述与步骤 304的所有描述相同。 步骤 505: SPE1恢复 SPE1与邻居关系 2对应的 UPE之间的路由的优 先级。
本步骤的一种实现过程为: SPE1向邻居关系 2对应的 UPE发布缺省路 由, 将缺省路由中的 as-path字段的长度恢复为配置值。
本发明实施例还提出了一种 SPE, 参见图 6, 该 SPE包括:
绑定模块 601 , 用于建立 SPE到骨干网的路由设备的第一邻居关系与 该 SPE到 UPE的第二邻居关系之间的绑定关系;
监测模块 602, 用于监测所述第一邻居关系是否中断;
触发模块 603 , 当监测模块 602监测到所述第一邻居关系中断时, 触发 所述第二邻居关系对应的 UPE进行路由切换。
可选地, 参见图 7, 本发明 SPE的实施例 1中, 监测模块 602可以包 括第一监测子模块 6021 , 用于通过监测 KeepAlive报文监测所述第一邻居 关系是否中断; 或者,
参见图 8, 本发明 SPE的实施例 2中, 监测模块 602可以包括第二监 测子模块 6022, 用于通过监测 BFD报文监测所述第一邻居关系是否中断。
可选地, 参见图 9, 本发明 SPE的实施例 3中, 触发模块 603包括第 一触发模块 6031 , 第一触发模块 6031用于中断 SPE与所述第二邻居关系 对应的 UPE之间的路由; 或者,
参见图 10, 本发明 SPE的实施例 4中, 触发模块 603包括第二触发模 块 6032, 第二触发模块 6032用于中断所述第二邻居关系; 或者,
参见图 11 , 本发明 SPE的实施例 5中, 触发模块 603包括第三触发模 块 6033 , 第三触发模块 6033用于将 SPE与所述第二邻居关系对应的 UPE 之间的路由的优先级降低, 且低于其他 SPE与该 UPE之间路由的优先级。
参见图 9, 所述第一触发模块 6031中还可以包括第一触发执行子模块 901 ,第一触发执行子模块 901用于向所述第二邻居关系对应的 UPE发送撤 销路由通知; 或者, 参见图 11 , 所述第三触发模块 6033 包括第二触发执行子模块 1101 , 第二触发执行子模块 1101用于向所述第二邻居关系对应的 UPE发布缺省路 由, 所述缺省路由中的 as-path字段的长度增加, 且大于其他 SPE向所述 UPE发布的缺省路由中 as-path字段的长度。
参见图 12, 本发明 SPE的实施例 6中, SPE可以进一步包括收敛模块 1202和第一恢复模块 1201 ; 或者, 参见图 13 , 本发明 SPE的实施例 7中, 本发明实施例提出的 SPE中可以进一步包括收敛模块 1202和第二恢复模块 1301 ; 或者, 参见图 14, 本发明 SPE的实施例 8中, 本发明实施例提出的 SPE中可以进一步包括收敛模块 1202和第三恢复模块 1401。
参见图 12〜图 14, 收敛模块 1202用于接收来自骨干网的第一邻居关系 收敛完成指示;
第一恢复模块 1201 ,用于在所述收敛模块 1202接收到所述第一邻居关 系收敛完成指示后, 向所述第二邻居关系对应的 UPE发布恢复路由通知; 第二恢复模块 1301 ,用于在所述收敛模块 1202接收到所述第一邻居关 系收敛完成指示后, 恢复所述第二邻居关系; 或者,
第三恢复模块 1401 ,用于在所述收敛模块 1202接收到所述第一邻居关 系收敛完成指示后, 向所述第二邻居关系对应的 UPE发布所述缺省路由, 所述缺省路由中的所述 as-path字段的长度恢复为配置值。
参见图 15 , 本发明 SPE的实施例 9中, SPE可以进一步包括: 第一处 理模块 1501 ,用于与骨干网中的多个路由设备分别建立所述第一邻居关系, 在从所述多个路由设备学习到相同的路由后, 将所述绑定关系中所述 SPE 与所述多个路由设备的多个第一邻居关系使用逻辑与连接;
所述监测模块 602包括第三监测子模块 6023 , 用于监测所述多个第一 邻居关系是否全部中断。
参见图 16, 本发明 SPE的实施例 10中, SPE可以进一步包括: 第二 处理模块 1601 , 用于与骨干网中的多个路由设备分别建立所述第一邻居关 系, 在从所述多个路由设备学习到不同的路由后, 将所述绑定关系中所述
SPE与所述多个路由设备的多个第一邻居关系使用逻辑或连接;
所述监测模块 602包括第四监测子模块 6024, 用于监测所述多个第一 邻居关系中的任意一个第一邻居关系是否中断。
本发明实施例还提出了一种路由切换系统, 该系统包括 UPE和上述本 发明实施例提出的任意一种 SPE。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机 可读取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序 代码的介质。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对 其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通 技术人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修 改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、 一种触发路由切换的方法, 其特征在于, 包括:
建立服务运营商侧运营商边缘设备到骨干网的路由设备的第一邻居关 系与所述服务运营商侧运营商边缘设备到用户侧运营商边缘设备的第二邻 居关系之间的绑定关系;
监测所述第一邻居关系是否中断;
当监测到所述第一邻居关系中断时, 触发所述第二邻居关系对应的用 户侧运营商边缘设备进行路由切换。
2、 根据权利要求 1所述的触发路由切换的方法, 其特征在于, 所述触 发所述第二邻居关系对应的用户侧运营商边缘设备进行路由切换包括: 中断所述服务运营商侧运营商边缘设备与所述第二邻居关系对应的用 户侧运营商边缘设备之间的路由; 或者,
中断所述第二邻居关系; 或者,
将所述服务运营商侧运营商边缘设备与所述第二邻居关系对应的用户 侧运营商边缘设备之间的路由的优先级降低, 且低于其他服务运营商侧运 营商边缘设备与所述用户侧运营商边缘设备之间路由的优先级。
3、 根据权利要求 2所述的触发路由切换的方法, 其特征在于, 所述中断所述服务运营商侧运营商边缘设备与所述第二邻居关系对应 的用户侧运营商边缘设备之间的路由包括: 向所述第二邻居关系对应的用 户侧运营商边缘设备发送撤销路由通知;
所述将所述服务运营商侧运营商边缘设备与所述第二邻居关系对应的 用户侧运营商边缘设备之间的路由的优先级降低包括: 向所述第二邻居关 系对应的所述用户侧运营商边缘设备发布缺省路由, 所述缺省路由中的 as-path字段的长度增加, 且大于其他服务运营商侧运营商边缘设备向所述 用户侧运营商边缘设备发布的缺省路由中 as-path字段的长度。
4、 根据权利要求 3所述的触发路由切换的方法, 其特征在于, 该方法 进一步包括: 接收来自骨干网的第一邻居关系收敛完成指示; 向所述第二邻居关系对应的用户侧运营商边缘设备发布恢复路由通 知; 或者,
恢复所述第二邻居关系; 或者,
向所述第二邻居关系对应的所述用户侧运营商边缘设备发布所述缺省 路由, 所述缺省路由中的所述 as-path字段的长度恢复为配置值。
5、 根据权利要求 1〜4任一所述的触发路由切换的方法, 其特征在于, 该方法进一步包括: 所述服务运营商侧运营商边缘设备与骨干网中的 多个路由设备分别建立所述第一邻居关系, 从所述多个路由设备学习到相 同的路由; 将所述绑定关系中所述服务运营商侧运营商边缘设备与所述多 个路由设备的多个第一邻居关系使用逻辑与连接;
所述监测所述第一邻居关系是否中断包括: 监测所述多个第一邻居关 系是否全部中断。
6、 根据权利要求 1〜4任一所述的触发路由切换的方法, 其特征在于, 该方法进一步包括: 所述服务运营商侧运营商边缘设备与骨干网中的 多个路由设备分别建立所述第一邻居关系, 从所述多个路由设备学习到不 同的路由; 将所述绑定关系中所述服务运营商侧运营商边缘设备与所述多 个路由设备的多个第一邻居关系使用逻辑或连接;
所述监测所述第一邻居关系是否中断包括: 监测所述多个第一邻居关 系中的任意一个第一邻居关系是否中断。
7、 一种服务运营商侧运营商边缘设备, 其特征在于, 包括: 绑定模块, 用于建立所述服务运营商侧运营商边缘设备到骨干网的路 由设备的第一邻居关系与所述服务运营商侧运营商边缘设备到用户侧运营 商边缘设备的第二邻居关系之间的绑定关系;
监测模块, 用于监测所述第一邻居关系是否中断;
触发模块, 当所述监测模块监测到所述第一邻居关系中断时, 触发所 述第二邻居关系对应的用户侧运营商边缘设备进行路由切换。
8、根据权利要求 7所述的服务运营商侧运营商边缘设备,其特征在于, 所述触发模块包括:
第一触发模块, 用于中断所述服务运营商侧运营商边缘设备与所述第 二邻居关系对应的用户侧运营商边缘设备之间的路由; 或者,
第二触发模块, 用于中断所述第二邻居关系; 或者,
第三触发模块, 用于将所述服务运营商侧运营商边缘设备与所述第二 邻居关系对应的用户侧运营商边缘设备之间的路由的优先级降低, 且低于 其他服务运营商侧运营商边缘设备与该用户侧运营商边缘设备之间路由的 优先级。
9、根据权利要求 8所述的服务运营商侧运营商边缘设备,其特征在于, 所述第一触发模块包括第一触发执行子模块, 用于向所述第二邻居关 系对应的用户侧运营商边缘设备发送撤销路由通知; 或者,
所述第三触发模块包括第二触发执行子模块, 用于向所述第二邻居关 系对应的所述用户侧运营商边缘设备发布缺省路由, 所述缺省路由中的 as-path字段的长度增加, 且大于其他服务运营商侧运营商边缘设备向所述 用户侧运营商边缘设备发布的缺省路由中 as-path字段的长度。
10、 根据权利要求 9所述的服务运营商侧运营商边缘设备, 其特征在 于, 进一步包括: 收敛模块, 用于接收来自骨干网的第一邻居关系收敛完 成指示; 以及
第一恢复模块, 用于在所述收敛模块接收到所述第一邻居关系收敛完 成指示后, 向所述第二邻居关系对应的用户侧运营商边缘设备发布恢复路 由通知; 或者,
第二恢复模块, 用于在所述收敛模块接收到所述第一邻居关系收敛完 成指示后, 恢复所述第二邻居关系; 或者,
第三恢复模块, 用于向所述第二邻居关系对应的所述用户侧运营商边 缘设备发布所述缺省路由, 所述缺省路由中的所述 as-path字段的长度恢复 为配置值。
11、 根据权利要求 7〜10任一所述的服务运营商侧运营商边缘设备, 其 特征在于, 进一步包括: 第一处理模块, 用于与骨干网中的多个路由设备 分别建立所述第一邻居关系, 在从所述多个路由设备学习到相同的路由后, 将所述绑定关系中所述服务运营商侧运营商边缘设备与所述多个路由设备 的多个第一邻居关系使用逻辑与连接;
所述监测模块包括第一监测子模块, 用于监测所述多个第一邻居关系 是否全部中断。
12、 根据权利要求 7〜10任一所述的服务运营商侧运营商边缘设备, 其 特征在于, 进一步包括: 第二处理模块, 用于与骨干网中的多个路由设备 分别建立所述第一邻居关系, 在从所述多个路由设备学习到不同的路由后, 将所述绑定关系中所述服务运营商侧运营商边缘设备与所述多个路由设备 的多个第一邻居关系使用逻辑或连接;
所述监测模块包括第二监测子模块, 用于监测所述多个第一邻居关系 中的任意一个第一邻居关系是否中断。
13、 一种路由切换系统, 所述系统包括用户侧运营商边缘设备和根据 权利要求 7-12任一项所述的服务运营商侧运营商边缘设备。
PCT/CN2011/074829 2010-09-08 2011-05-28 触发路由切换的方法和服务运营商侧运营商边缘设备 WO2011150780A1 (zh)

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