WO2016197817A1 - Procédé et appareil pour sortir d'un redémarrage par commande - Google Patents

Procédé et appareil pour sortir d'un redémarrage par commande Download PDF

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Publication number
WO2016197817A1
WO2016197817A1 PCT/CN2016/083179 CN2016083179W WO2016197817A1 WO 2016197817 A1 WO2016197817 A1 WO 2016197817A1 CN 2016083179 W CN2016083179 W CN 2016083179W WO 2016197817 A1 WO2016197817 A1 WO 2016197817A1
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WO
WIPO (PCT)
Prior art keywords
interface
instance
area
exit
lsa
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PCT/CN2016/083179
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English (en)
Chinese (zh)
Inventor
何建军
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中兴通讯股份有限公司
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Publication of WO2016197817A1 publication Critical patent/WO2016197817A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0659—Management of faults, events, alarms or notifications using network fault recovery by isolating or reconfiguring faulty entities
    • H04L41/0661—Management of faults, events, alarms or notifications using network fault recovery by isolating or reconfiguring faulty entities by reconfiguring faulty entities
    • 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

Definitions

  • the present application relates to, but is not limited to, a communication routing technology, and more particularly to a method and apparatus for exiting a graceful restart (GR).
  • GR graceful restart
  • GR Graceful Restart
  • the active/standby switchover may be interrupted due to a restart of the routing protocol or other reasons, and route flapping may occur on the entire network. Due to the redundancy fault tolerance, link guarantee, and node fault recovery functions of the GR, the GR has been widely used in the scenarios of active/standby switchover and system upgrade to implement non-stop forwarding of key services during active/standby switchover or system upgrade.
  • the neighbor router After the active/standby switchover (OSPF) of the Open Shortest Path First (OSPF), the neighbor router will help restart the router to complete the graceful restart.
  • the main responsibilities include assisting the restart of the router to complete the synchronization of the link state database, regardless of the neighbor status of the restart router. How to maintain a connection to the restart router in the Link State Advertisement (LSA) generated by the router.
  • LSA Link State Advertisement
  • the neighbor router After the router is restarted, the neighbor router will help restart the router to complete the smooth restart process. After all neighboring routers complete the synchronization of the link state database, the restarting router has obtained all the link state information in the database before the restart. At this time, the router restarts the smooth restart process, and the smooth restart LSA of the aging age is sent to notify the neighbor router to exit. GR assistance process.
  • the router will not notify other neighbor routers that have completed the link state database synchronization to exit the GR assistance process, so that the assisted link state database has been completed.
  • the synchronized neighbor router exits the GR assist process lag.
  • the present application provides a method and apparatus for exiting a graceful restart, which can avoid the lag of the neighboring router that has completed the synchronization of the link state database.
  • the application provides a method for exiting a graceful restart, including:
  • the neighboring router corresponding to the interface is notified to exit the GR assistance process.
  • determining whether each interface included in the instance performs the exit GR process includes:
  • the link state advertisement (LSA) generated before the switching is obtained.
  • the LSA includes a router LSA and/or a network LSA.
  • all neighbor router information obtained before the switching from the LSA includes:
  • the method further includes:
  • the method further includes:
  • the interface When the interface completes the GR process in the area, it detects and determines whether all interfaces in the area are out of GR processing.
  • the method before exiting the GR process, the method further includes:
  • the method further includes:
  • the shortest path first (SPF) calculation in the trigger area obtains the intra-area routing information
  • the route calculation between the areas under the instance and the route calculation of the external route are triggered.
  • the routing table is updated according to the calculated intra-area routing information, the inter-area route calculation, and the external route routing calculation to regenerate the link state advertisement packet and send it to other neighboring routers.
  • the method further includes:
  • the method further includes:
  • the present application further provides an apparatus for exiting a graceful restart, which includes at least an interface exit unit, where the interface exit unit includes: an interface exit determination module and a neighbor router processing module;
  • the interface exits the judging module, and is configured to determine whether each interface included in the instance performs an exit smooth restart (GR) process;
  • GR exit smooth restart
  • the neighbor router processing module is set to complete the exit of the interface that determines to exit the GR processing. After the GR is processed, the neighbor router corresponding to the interface is notified to exit the GR assistance process.
  • the interface exit judgment module is set to: for each interface under the instance,
  • the link state advertisement (LSA) generated before the switching is obtained.
  • the LSA includes a router LSA and/or a network LSA.
  • the interface exit judgment module is set to: for each interface under the instance,
  • the device further includes: an area exit unit and an instance exit unit; wherein
  • the area exit unit is set to exit the GR process when all the interfaces in the area are out of the GR process.
  • the instance exits the unit and is set to exit the GR process when all the areas in the instance are out of the GR process.
  • the device further includes an area exit judging unit, configured to: when an interface is completed in the area to complete the GR processing, detecting and determining whether all interfaces in the area are completed to exit the GR processing, and all interfaces in the area are completed to exit.
  • an area exit judging unit configured to: when an interface is completed in the area to complete the GR processing, detecting and determining whether all interfaces in the area are completed to exit the GR processing, and all interfaces in the area are completed to exit.
  • all interfaces in the sending area complete the information of the GR processing to the area exit unit.
  • the device further includes an instance exit judging unit, configured to: when an area is completed and exiting the GR processing, the all areas in the instance are all detected to exit the GR processing, and all areas are completed in the instance. When exiting GR processing, all areas under the sending instance are completed. Exit the GR processing information to the instance exit unit.
  • the device further includes: a route update unit, configured to:
  • the shortest path first (SPF) calculation in the trigger area obtains the intra-area routing information
  • the route calculation between the areas under the instance and the route calculation of the external route are triggered.
  • the routing table is updated according to the calculated intra-area routing information, the inter-area route calculation, and the external route routing calculation to regenerate the link state advertisement packet and send it to other neighboring routers.
  • the apparatus further includes adding an identification unit, and the setting is:
  • the interface exit judging module is further configured to: when a neighboring router state of the interface reaches FULL, if the LSA generated before the switching is obtained, the sending does not include obtaining the LSA generated before the switching to the instance exiting unit;
  • the instance exiting unit is further configured to: directly exit the GR processing on the instance according to the information from the interface exiting the determining module that does not include the LSA that can be obtained before the switching.
  • the present application also provides a computer readable storage medium storing computer executable instructions that, when executed, implement the method of exiting a smooth restart as described above.
  • the technical solution of the present application includes: determining whether each interface included in the instance is subjected to an exit smooth restart (GR) process, and notifying the corresponding interface of the interface after the exiting GR processing is completed.
  • the neighbor router exits the GR assistance process.
  • the method of the present application performs the process of exiting the GR for each interface in the instance.
  • the neighbor router of the interface is notified to exit the GR assistance process, and the neighbor router that has assisted in synchronizing the link state database is avoided. Exiting the GR assistance process lags behind.
  • FIG. 1 is a flowchart of a method for exiting a smooth restart according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of an apparatus for exiting a smooth restart according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method according to Embodiment 1 of the present invention.
  • FIG. 5 is a flowchart of a method according to Embodiment 3 of the present invention.
  • the neighbor router after the neighbor router assists in restarting the router to complete the link state database synchronization, the neighbor router has completed the task of assisting the restarting router to synchronize the link state database during the GR, and the neighbor router may exit the GR assistance process.
  • FIG. 1 is a flowchart of a method for exiting a smooth restart according to an embodiment of the present invention. As shown in FIG. 1 , the method includes the following steps:
  • Step 100 Determine whether each interface included in the instance performs an exit smooth restart (GR) process
  • Step 101 After the exiting the GR process is completed, the neighboring router corresponding to the interface is notified to exit the GR assisting process.
  • the embodiment includes several areas, and each area includes a corresponding number of interfaces.
  • the interface included in the embodiment is an interface included in the area included in the example, which is common knowledge of those skilled in the art.
  • the determining whether each interface included in the instance performs the exit GR process includes:
  • the link state advertisement (LSA) generated before the switching is obtained.
  • the LSA includes a router LSA and/or a network LSA.
  • determining whether the neighbor router status reaches FULL includes: obtaining whether all the neighbor router information before the switching has been synchronized with the previous neighbor state database, and determining that the neighbor router status reaches FULL when the synchronization is performed, which belongs to the prior art.
  • the usual technical means of personnel will not be repeated here.
  • the network LSA is an LSA when the interface is a Designated Router (DR) interface, and the other type of interface is a router LSA, which is common knowledge of those skilled in the art.
  • DR Designated Router
  • All neighbor router information obtained before the switching from the LSA includes:
  • the interface in the instance and the neighbor router information corresponding to each interface are determined according to the connection information in the LSA.
  • the connection included in the LSA may be a point-to-point connection, a virtual link connection, or a connection to a transport network.
  • the method in this embodiment further includes:
  • the interface When the interface completes the GR process in the area, it detects and determines whether all interfaces in the area are out of GR processing.
  • the method in this embodiment further includes:
  • the method of this embodiment further includes: when the status of a neighboring router of the interface reaches FULL, if the LSA generated before the switching is not included, the instance is directly logged out of the GR.
  • the shortest path first (SPF) calculation in the trigger area obtains the intra-area routing information
  • the route calculation between the areas under the instance and the route calculation of the external route are triggered.
  • the routing table is updated according to the calculated intra-area routing information, the inter-area route calculation, and the external route routing calculation to regenerate the link state advertisement packet and send it to other neighboring routers.
  • the method in this embodiment performs the process of exiting the GR for each interface in the instance.
  • the neighboring router of the interface is notified to exit the GR assistance process, thereby avoiding the neighbors that have completed the synchronization of the link state database.
  • the router exits the GR assistance process lags.
  • the apparatus includes at least an interface exit unit, where the interface exit unit includes: an interface exit determination module and a neighbor router processing module;
  • the interface exits the judging module, and is configured to determine whether each interface included in the instance performs an exit smooth restart GR process
  • the neighboring router processing module is configured to notify the neighboring router corresponding to the interface to exit the GR assistance process after the interface that is determined to perform the GR-out process completes the GR process.
  • the interface exit judgment module is set to: for each interface under the instance,
  • the LSA includes a router LSA and/or a network LSA.
  • the interface exit judgment module is set to: for each interface under the instance,
  • the device of this embodiment further includes: an area exit unit and an instance exit unit; wherein
  • the area exit unit is set to exit the GR process when all the interfaces in the area are out of the GR process.
  • the instance exits the unit and is set to exit the GR process when all the areas in the instance are out of the GR process.
  • the apparatus of this embodiment further includes an area exit judging unit, configured to: when an interface is completed in the area to complete the GR processing, detecting and determining whether all interfaces in the area are completed to exit the GR processing, and all interfaces in the area are completed to exit the GR. During processing, all interfaces in the sending area complete the information of the GR processing to the area exit unit.
  • the device of this embodiment further includes an instance exit judging unit, which is configured to: when an area in the instance completes the exit of the GR process, detect and determine whether all areas under the instance are all completed to exit the GR process, and all areas are completed in the instance. When the GR is processed, all the areas in the sending instance complete the information of the GR processing to the instance exit unit.
  • an instance exit judging unit which is configured to: when an area in the instance completes the exit of the GR process, detect and determine whether all areas under the instance are all completed to exit the GR process, and all areas are completed in the instance.
  • the apparatus of this embodiment further includes: a route update unit, configured to:
  • the route calculation between the areas under the instance and the route calculation of the external route are triggered.
  • the routing table is updated according to the calculated intra-area routing information, the inter-area route calculation, and the external route routing calculation to regenerate the link state advertisement packet and send it to other neighboring routers.
  • the device of this embodiment further includes an adding identifier unit, which is set as:
  • the interface exit judging module is further configured to: when a neighboring router state of the interface reaches FULL, if the LSA generated before the switching is obtained, the sending does not include obtaining the LSA generated before the switching to the instance exiting unit;
  • the instance exiting unit is further configured to: directly exit the GR processing on the instance according to the information from the interface exiting the determining module that does not include the LSA that can be obtained before the switching.
  • the device in this embodiment may be directly disposed on the restarting router, or connected or interacted with the restarting router, and the setting or connecting does not require any creative work by those skilled in the art.
  • FIG. 3 is a flowchart of the method in this embodiment, as shown in FIG. The process includes the following steps:
  • Step 300 Restart the router and find that a neighbor router status on the interface reaches FULL.
  • Step 301 Restart the router to search the area database of the area to which the interface belongs, and obtain the link state advertisement (LSA) of the router generated before the interface is switched. If the LSA generated before the switchover is successful, Step 3030 is performed; if the LSA generated before the switching fails, step 3020 is performed;
  • LSA link state advertisement
  • Step 3020 The instance performs the exit GR process.
  • the neighboring router when the neighbor status of the neighboring router of the interface reaches FULL, the neighboring router has completed the synchronization to complete the synchronization of the database information. If the LSA and the network LSA generated before the restart of the restarting switch are not obtained, the local router cannot obtain the LSA and the network LSA. The neighbor information before the switchover indicates that the database on both ends is inconsistent. The restarter router immediately exits the GR process.
  • Step 3030 Obtain all neighbor router information before the switching from the LSA.
  • the step includes: determining an interface in the instance and neighbor router information corresponding to each interface according to the connection information in the LSA.
  • the connection included in the LSA may be a point-to-point connection, a virtual link connection, or a connection to a transmission network.
  • the connection contained in the LSA can be confirmed by the interface address of the Link Date field. If the interface type is point-to-point or virtual link, the Link ID field in the connection is the corresponding neighbor. If the interface type is broadcast network and the interface is not DR, the Link ID field in the connection is the corresponding neighbor (the neighbor is DR). If the interface type is the broadcast network and the interface is the DR, you need to find the network LSA generated before the switchover is restarted in the database.
  • the connection neighbor field in the network LSA is the corresponding neighbor on the interface.
  • Step 3031 Determine, according to the obtained information about all the neighboring routers before the switching, that all the neighboring routers reach the FULL state, and determine to perform the GR processing on the interface.
  • the interface When the interface is a point-to-point connection, determine whether all neighbor routers on the interface reach FULL. If all neighbor routers reach FULL, exit the GR processing on the interface. If the neighbor router status does not reach FULL, continue. monitor.
  • the interface obtained by analyzing the LSA can be added with an identifier or state code, and a corresponding completion identifier or state code is added to the interface that completes the GR processing. Methods of adding an identification or status code are a common technical means for those skilled in the art.
  • the interface When the interface is connected to the transport network, determine whether all neighbor routers of the interface reach FULL. If all neighbor routers reach FULL, exit the interface from the GR. If there is a neighbor router status that does not reach FULL, continue monitoring.
  • the interface When the interface is a virtual link, determine whether all the neighbor routers of the interface reach FULL. If all the neighbors reach the FULL state, the interface is removed from the GR. If the neighbor router does not reach the FULL state, the monitoring continues. .
  • the method in this embodiment needs to restart the router to obtain the network LSA generated before the switching, and obtain the neighbor router information before the restart by using the network LSA generated before the switching;
  • the method for obtaining the information of the neighboring routers before the restart is obtained by the network LSA. After the network LSA analyzes the information about the neighbor routers of the interface and the interface, the process of whether to exit the GR process and the LSA of the embodiment are performed. The method is consistent and will not be described here.
  • Step 3032 After the interface completes the GR process, the neighbor router corresponding to the interface is notified to exit the GR assistance process.
  • This example is based on the example that the interface is configured to remove the GR from the GR when the interface is removed from the GR.
  • FIG. 4 is a flowchart of a method in this embodiment. As shown in FIG. 4, the process includes the following steps:
  • Step 400 When an interface in the area completes the GR processing, it detects and determines whether all interfaces in the area are completed to exit the GR process.
  • the interface GR when the interface completes the GR processing, the interface GR is added to complete the identifier. Therefore, the identifier can be used to determine whether the interface completes the GR processing. If all the interfaces in the area are out of the GR process, go to step 401; otherwise, go to step 400 again.
  • Step 401 When all interfaces in the area are determined to exit the GR process, the area is subjected to GR processing.
  • the number of the interfaces that are identified by the GR is the same as the number of the interfaces that are added with the GR in the area.
  • step 400 is repeatedly performed until all interfaces complete the GR processing, and subsequent processing is performed.
  • Step 402 When the area completes the GR process, the shortest path first (SPF) in the trigger area is obtained.
  • the intra-area routing information is obtained by the calculation.
  • the obtained intra-area routing information is used to update the routing table when the subsequent instance exits the GR process.
  • FIG. 5 is a flowchart of a method in this embodiment. As shown in FIG. 5, the process includes the following steps:
  • Step 500 When the area is completed and the GR processing is completed in the instance, it is detected and determined whether all areas under the instance are completed to exit the GR processing;
  • step 501 is performed; otherwise, step 500 is re-executed.
  • step 501 when all the areas in the instance are out of the GR process, the instance is exited from the GR process.
  • Step 502 When the instance completes the GR process, the route calculation between the areas under the instance and the route calculation of the external route are triggered.
  • step 503 the intra-area routing information obtained when the GR processing is completed according to the area is completed, and the routing calculation between the inter-area and the routing calculation of the external routing are performed on all areas in the instance to complete the GR processing, and the routing table is updated, and the link is re-generated.
  • the status advertisement message is sent to other neighbor routers.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when the computer executable instructions are executed.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function.
  • This application is not limited to any specific combination of hardware and software.
  • the embodiment of the present application provides a method and an apparatus for exiting a graceful restart, which avoids the lag of the neighboring router that has completed the synchronization of the link state database.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé pour sortir d'un redémarrage par commande. Le procédé comprend les étapes consistant : à déterminer respectivement s'il faut effectuer un traitement de sortie d'un redémarrage par commande (GR) pour chaque interface comprise dans une instance ; et après que le traitement de sortie de GR est terminé pour une interface pour laquelle il est déterminé qu'il faut effectuer le traitement de sortie de GR, à donner l'instruction à un routeur voisin correspondant à l'interface de faire exister un processus d'assistance de GR. Selon le procédé, le traitement d'un GR existant est respectivement effectué pour chaque interface dans une instance, et lorsque le traitement d'un GR existant est effectué pour chaque interface, un routeur voisin correspondant à l'interface reçoit l'instruction de sortir d'un processus d'assistance de GR, ce qui permet d'empêcher à un routeur voisin, ayant achevé son assistance dans la synchronisation d'une base de données d'état de liaison, d'être en retard dans la sortie du processus d'assistance de GR.
PCT/CN2016/083179 2016-01-04 2016-05-24 Procédé et appareil pour sortir d'un redémarrage par commande WO2016197817A1 (fr)

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CN201610003745.2 2016-01-04
CN201610003745.2A CN106941444A (zh) 2016-01-04 2016-01-04 一种退出平滑重启的方法及装置

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN113422722A (zh) * 2021-06-16 2021-09-21 锐捷网络股份有限公司 路由处理方法及装置

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US7508772B1 (en) * 2006-06-02 2009-03-24 Cisco Technology, Inc. Partial graceful restart for border gateway protocol (BGP)
CN101505277A (zh) * 2009-03-10 2009-08-12 华为技术有限公司 一种退出优雅重启的方法、设备及系统
CN102624635A (zh) * 2012-04-23 2012-08-01 杭州华三通信技术有限公司 一种平滑重启实现方法及设备

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US7508772B1 (en) * 2006-06-02 2009-03-24 Cisco Technology, Inc. Partial graceful restart for border gateway protocol (BGP)
CN101505277A (zh) * 2009-03-10 2009-08-12 华为技术有限公司 一种退出优雅重启的方法、设备及系统
CN102624635A (zh) * 2012-04-23 2012-08-01 杭州华三通信技术有限公司 一种平滑重启实现方法及设备

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CN113422722A (zh) * 2021-06-16 2021-09-21 锐捷网络股份有限公司 路由处理方法及装置
CN113422722B (zh) * 2021-06-16 2023-10-24 锐捷网络股份有限公司 路由处理方法及装置

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