WO2009026829A1 - Procédé et système de protection contre les défaillances d'une connexion de commande de niveau 2 - Google Patents

Procédé et système de protection contre les défaillances d'une connexion de commande de niveau 2 Download PDF

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Publication number
WO2009026829A1
WO2009026829A1 PCT/CN2008/072061 CN2008072061W WO2009026829A1 WO 2009026829 A1 WO2009026829 A1 WO 2009026829A1 CN 2008072061 W CN2008072061 W CN 2008072061W WO 2009026829 A1 WO2009026829 A1 WO 2009026829A1
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WIPO (PCT)
Prior art keywords
edge node
connection
layer
normal
abnormality
Prior art date
Application number
PCT/CN2008/072061
Other languages
English (en)
French (fr)
Inventor
Ruobin Zheng
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to ES08784052T priority Critical patent/ES2374029T3/es
Priority to AT08784052T priority patent/ATE529998T1/de
Priority to EP08784052A priority patent/EP2192743B1/en
Publication of WO2009026829A1 publication Critical patent/WO2009026829A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • 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
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/08Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
    • 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
    • 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

Definitions

  • the present invention relates to the field of communications, and more particularly to an anomaly protection technique for layer 2 control connections.
  • the Customer Premises Network is composed of User Equipment (“UE") and the Premises Gateway RG.
  • the Access Network is accessed by an Access Node (referred to as “Access Node”).
  • AN Access Node
  • EN Broadband Remote Access Server
  • Aggregation Network the aggregation network between the two.
  • WiMAX Worldwide Interoperability for Microwave Access
  • ASN GW Access Service Network Gate Way
  • AN is usually a base station.
  • BS Digital Subscriber Line
  • DSL Digital Subscriber Line
  • EN is usually Broadband Remote Access Server (BRAS) or Broadband Network Gateway (Broadband Network Gateway) , referred to as “BNG” for short
  • BNG Broadband Network Gateway
  • AN is usually a Digital Subscriber Line Access Multiplexer (DSLAM).
  • DSL Digital Subscriber Line
  • BRAS Broadband Remote Access Server
  • BNG Broadband Network Gateway
  • DSL Digital Subscriber Line Access Multiplexer
  • L2CP Layer 2 Control Protocol
  • the existing technology controls the AN and the EN through the L2C connection established between the AN and the EN of the access network, and performs an L2C packet or an Internet Protocol (IP) session. Message interaction.
  • IP Internet Protocol
  • the inventors of the present invention have found that there is no related protection technology for L2C connection in the prior art. Once an abnormality occurs in the L2C connection, how to protect the normal transmission of the message becomes an urgent problem to be solved. Summary of the invention
  • the main technical problem to be solved by the embodiments of the present invention is to provide a layer 2 control connection abnormal protection method and system, so that the L2C connection can be protected when the connection is abnormal.
  • an embodiment of the present invention provides a layer 2 control connection abnormal protection method, which includes the following steps:
  • the layer 2 control connection on the first edge node is switched to the other normal edge node to implement the "1 + 1" backup or load sharing of the edge node. , or implement "N + 1" backup or load sharing of the edge node.
  • the embodiment of the present invention further provides a layer 2 control connection abnormal protection system, comprising: a monitoring unit, configured to monitor an edge node in the access network and/or a connection of the edge node; When the monitoring unit finds that the first edge node is abnormal, switching the layer 2 control connection on the first edge node to another normal edge node to implement "1 + 1" backup or load sharing of the edge node, or Backup or load sharing of "N + 1".
  • a layer 2 control connection abnormal protection system comprising: a monitoring unit, configured to monitor an edge node in the access network and/or a connection of the edge node; When the monitoring unit finds that the first edge node is abnormal, switching the layer 2 control connection on the first edge node to another normal edge node to implement "1 + 1" backup or load sharing of the edge node, or Backup or load sharing of "N + 1".
  • the EN and/or the connection of the EN in the access network are monitored. If the L2C connection of the first EN is abnormal, the L2C connection on the first EN is switched to another normal EN, so that the L2C connection of the EN occurs. The fault can be protected and the L2C packet or IP session packet can still be transmitted normally.
  • FIG. 1 is a schematic diagram of a general reference architecture of an access network in the prior art
  • FIG. 2 is a schematic diagram of a connection failure in an abnormality protection method for an L2C connection according to a first embodiment of the present invention
  • FIG. 3 is a flowchart of an abnormality protection method for an L2C connection according to a first embodiment of the present invention
  • FIG. 4 is a flowchart of an abnormality protection method for an L2C connection according to a second embodiment of the present invention
  • FIG. 5 is a third embodiment of the present invention. Schematic diagram of connection failure in the abnormal protection method of the L2C connection;
  • FIG. 6 is a flowchart of an abnormality protection method for an L2C connection according to a third embodiment of the present invention
  • FIG. 7 is a flowchart of an abnormality protection method for an L2C connection according to a fourth embodiment of the present invention
  • 8 is a schematic diagram of a connection failure in an abnormality protection method for an L2C connection according to a fifth embodiment of the present invention
  • FIG. 9 is a flowchart of an abnormality protection method for an L2C connection according to a fifth embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a connection failure in an abnormality protection method for an L2C connection according to a sixth embodiment of the present invention.
  • FIG. 11 is a flowchart of an abnormality protection method for an L2C connection according to a sixth embodiment of the present invention.
  • FIG. 12 is a structural diagram of an abnormality protection system for an L2C connection according to a seventh embodiment of the present invention. detailed description
  • a first embodiment of the present invention relates to an abnormality protection method for L2C connection.
  • a reference point or connection is established between each EN in the access network, and there is a reference point or connection between EN1 and EN2 as shown in FIG. 2, and multiple ENs are coordinated by a controller (Controller). , realizes the "1 + 1" or "N + 1" backup of EN, that is, one EN corresponds to one spare EN, or N EN corresponds to one spare EN.
  • the L2C connection is established between the AN and the source EN (EN1), and the L2C connection is detected by the L2CP survival monitoring mechanism or other abnormal monitoring mechanism.
  • EN1 the source EN
  • the specific process is shown in Figure 3.
  • step 301 when there is a fault in the aggregation network between the AN and the source EN, the source EN will detect an L2C connection anomaly.
  • step 302 the source EN reports an L2C connection exception to the controller.
  • step 303 the controller sends a handover request to one or more destinations EN (e.g., EN2).
  • the destination EN forwards the handover request to the AN.
  • step 305 the destination EN or controller allocates the resources required for source EN switching. Step 305 can be performed prior to step 304 or between step 304 and step 306.
  • step 306 after the AN receives the handover request from the destination EN, the AN completes the resource reservation before the handover, and then sends a handover response to the destination EN, agreeing to switch the L2C connection of the source EN.
  • step 307 after the destination EN receives the handover response of the AN, and the resource allocation on the destination EN is completed, a handover response is sent to the controller, the handover response indicating that the L2C connection of the source EN is agreed to be switched.
  • the controller may receive a handover response from multiple destination ENs, and the controller may make a handover decision to select the appropriate destination EN. If the controller receives only one handover response for the destination EN, step 308 may be omitted.
  • switch decisions You can use the first-to-first-choice method, that is, the controller selects the destination EN corresponding to the first received handover response. Alternatively, you can use the optimal selection method, that is, the controller receives the The handover response, select the optimal destination EN for resource allocation, such as the purpose of the most resource allocation EN.
  • step 309 the controller issues a switching command to the source EN to switch to the corresponding destination EN, the switching command includes the identifier of the destination EN to be switched, and initiates the switching process of the L2C connection, that is, the connection of the L2C starts to change.
  • step 310 source EN sends a handover command to the AN.
  • the source EN may migrate the context and status information of the L2C connection to the destination EN by a reference point or connection between the source EN and the destination EN. And / or source EN can migrate the context and status information of the IP session to the destination EN through a reference point or connection between the source EN and the destination EN.
  • the purpose EN is the backup EN of the source EN. In this embodiment, different source ENs can be backed up by different ENs, that is, "1 + 1" backup is realized; or, different source ENs can also be backed up by the same EN, that is, "N + 1" backup is realized. .
  • the L2C connection between the AN and the source EN is replaced by a bidirectional connection between the AN and the destination EN, and a bidirectional connection between the destination EN and the source EN, as shown in Figure 2. Shown in the dotted line.
  • the AN sends the L2C packet or the IP session packet whose destination address is the source EN to the destination EN, but the L2C packet or the IP session packet is not terminated by the destination EN, but is passed through the destination EN.
  • the source EN goes to the source EN and performs subsequent transmission or processing by the source EN.
  • the source EN sends the L2C packet or the IP session packet whose destination address is AN to the destination EN, and goes to the AN through the destination EN.
  • step 312 the context and status information of the L2C connection, and/or the migration of the context and status information of the IP session is completed, that is, the handover is completed, and the destination EN sends an indication to the AN indicating that the handover is complete, notifying the AN that the current L2C connection has been switched.
  • the AN and the destination EN can directly exchange L2C packets or IP session packets.
  • the second embodiment of the present invention also relates to an abnormal protection method for L2C connection, which is substantially the same as the first embodiment, except that in the first embodiment, the controller participates in the switching of the L2C connection of the source EN, that is, When the source EN finds an abnormality, it reports to the controller, and the controller sends a handover request to one or more destinations EN.
  • the independent controller is not provided to uniformly coordinate the L2C connection switching process.
  • the L2C connection switching process is controlled by the EN itself.
  • step 401 is the same as the step 301, and details are not described herein again.
  • step 402 source EN sends a handover request to destination EN.
  • step 403 after receiving the handover request, the destination EN forwards the handover request to the AN.
  • step 404 the destination EN allocates resources required for source EN switching. Step 404 can be performed before step 403 or between step 403 and step 405.
  • step 405 after the AN receives the handover request from the destination EN, the AN completes the resource reservation before the handover, and then sends a handover response to the destination EN, the handover response indicating that the L2C connection of the source EN is agreed to be switched.
  • step 406 after the destination EN receives the handover response of the AN and the resource allocation on the destination EN is completed, a handover response is sent to the source EN, the handover response indicating agreement to switch EN.
  • source EN may receive a handover response from multiple destination ENs, source EN may make a handover decision to select the appropriate destination EN, and source EN may send a handover command to destination EN indicating that the destination EN is selected.
  • step 408 the source EN sends a handover command to the AN, which includes the identifier of the destination EN to which the handover is made, and initiates a handover procedure of the L2C connection, that is, the connection of the L2C begins to change.
  • Steps 409 and 410 are the same as steps 311 and 312, and are not described here.
  • the third embodiment of the present invention also relates to an abnormal protection method for an L2C connection.
  • a reference point or a connection is established between each EN in the access network, and multiple ENs are coordinated by a controller to implement EN "1 + 1" or " ⁇ + ⁇ backup or load sharing.
  • the present embodiment is substantially the same as the first embodiment, and the difference is that, in the first embodiment, the abnormal protection method of the L2C connection when the aggregation network between the source EN and the AN is faulty is described; Describes the abnormal protection method of the L2C connection when the source EN is overloaded, or when the aggregation network after the source EN fails, such as when the aggregation network between the source EN and the core network fails. As shown in Figure 5.
  • the survival of the L2C connection is also detected by the L2CP survival monitoring mechanism or other abnormality monitoring mechanism.
  • the specific process is shown in Figure 6.
  • step 601 when the source EN is overloaded, or the aggregation network after source EN fails, the source EN will detect an L2C connection anomaly.
  • Steps 602 to 610 are the same as steps 302 to 310, and are not described herein again.
  • the source EN may migrate the context and status information of the L2C connection to the destination EN through a reference point or connection between the source EN and the destination EN; and/or the source EN may set the context and status information of the IP session.
  • the target EN is migrated by a reference point or connection between the source EN and the destination EN.
  • the L2C connection is replaced by a one-way connection from the AN to the source EN, and a one-way connection from the source EN to the destination EN, as shown by the dashed line in Figure 5.
  • the AN sends the L2C packet or the IP session packet whose destination address is the source EN to the source EN, but the L2C packet or the IP session packet is not in the source EN. At the end, it is transferred to the destination EN via the source EN, and is subsequently transmitted or processed by the destination EN.
  • step 612 the context and status information of the L2C connection, and/or the migration of the context and status information of the IP session is completed, that is, the handover is completed, and the destination EN sends an indication to the AN indicating that the handover is complete, notifying the AN that the current L2C connection has been switched.
  • the AN and the destination EN can directly exchange L2C packets or IP session packets.
  • the fourth embodiment of the present invention also relates to an abnormal protection method for an L2C connection.
  • a reference point or a connection is established between each EN in the access network, and multiple ENs are coordinated by a controller to implement EN "1 + 1" or "N + ⁇ backup or load sharing.
  • the present embodiment is substantially the same as the second embodiment, and the difference is that, in the second embodiment, the abnormal protection method of the L2C connection when the aggregation network between the source EN and the AN is faulty is described;
  • the description describes the abnormal protection method of the L2C connection when the source EN is overloaded, or when the aggregation network after the source EN fails, such as when the aggregation network between the source EN and the core network fails.
  • the survival of the L2C connection is also detected by the L2CP survival monitoring mechanism or other abnormality monitoring mechanism.
  • the specific process is shown in Figure 7.
  • step 701 when the source EN is overloaded, or the aggregation network after the source EN fails, the source EN will detect an L2C connection abnormality.
  • Steps 702 to 708 are the same as steps 402 to 408, and are not described herein again.
  • the source EN may migrate the context and state information of the L2C connection to the destination EN through a reference point or connection between the source EN and the destination EN; and/or the source EN may set the context and status information of the IP session.
  • the target EN is migrated by a reference point or connection between the source EN and the destination EN.
  • the L2C connection between the AN and the source EN is replaced by a one-way connection from the AN to the source EN and a one-way connection from the source EN to the destination EN, as shown in the dotted line in Figure 5. Part of it. Specifically, before the handover is completed, the AN sends the L2C packet or the IP session packet whose source address is the source EN to the source EN. However, the L2C packet or the IP session packet is not terminated by the source EN, but is passed through the source. EN transfers to the destination EN for subsequent transmission or processing by the destination EN.
  • step 710 the context and status information of the L2C connection, and/or the context and status information of the IP session are migrated, that is, the handover is completed, and the destination EN sends an indication to the AN indicating that the handover is complete, notifying the AN that the current L2C connection has been switched to
  • the AN and the destination EN can directly exchange L2C packets or IP session packets.
  • the fifth embodiment of the present invention also relates to an abnormal protection method for L2C connection.
  • This embodiment is similar to the first embodiment.
  • it is also necessary to establish a reference point or a connection between each EN in the access network, and multiple ENs are coordinated by a controller to implement an IP edge node.
  • Aggregation Switch abbreviated as "AGS”
  • the L2C connection of the source EN is carried on the bidirectional connection between the AN and the controller and the bidirectional connection between the controller and the source EN, and the L2CP survival is monitored and monitored by the L2CP survival mechanism or other abnormal monitoring mechanism.
  • the controller will detect an L2C connection abnormality.
  • step 902 the controller sends a handover request to one or more destinations EN.
  • step 903 the destination EN or controller allocates the resources required for the EN handover.
  • step 904 after the resource allocation on the destination EN is completed, the destination EN is sent to the controller.
  • a handover response is sent, the handover response indicating an agreement to switch the L2C connection of the source EN.
  • the controller may receive a handover response from multiple destination ENs, and the controller makes a handover decision to select the appropriate destination EN.
  • step 906 the controller issues a handover command to the source EN to switch to the selected destination EN, the handover command including the identity of the destination EN to which the handover is made, and the handover procedure is initiated.
  • the source EN may migrate the context and state information of the L2C connection to the destination EN through a reference point or connection between the source EN and the destination EN; and/or the source EN may set the context and status information of the IP session,
  • the target EN is migrated by a reference point or connection between the source EN and the destination EN.
  • the L2C connection between the controller and the source EN is replaced by a bidirectional connection between the controller and the destination EN, and a bidirectional connection between the destination EN and the source EN, such as This is shown in the dotted line in Figure 8.
  • the controller sends the L2C packet or the IP session packet whose destination address is the source EN to the destination EN, but the L2C packet or the IP session packet is not terminated by the destination EN, but is The EN transits to the source EN, and the source EN performs subsequent transmission or processing.
  • the source EN sends the L2C packet or the IP session packet whose destination address is AN to the destination EN, and transfers to the controller through the destination EN. Then transfer to AN.
  • step 908 the context and status information of the L2C connection (including the IP session), and/or the context and status information of the IP session are migrated, ie, the handover is completed, and the source EN's L2C connection is switched between the destination EN and the controller.
  • the controller and the destination EN can directly exchange L2C packets or IP session packets.
  • the sixth embodiment of the present invention also relates to an abnormality protection method for L2C connection, which is substantially the same as the fifth embodiment, except that in the fifth embodiment, a convergence network between the source EN and the controller is described.
  • the abnormal protection method of the L2C connection in the present embodiment, the description is when the source EN is overloaded, or the aggregation network after the source EN fails, such as when the aggregation network between the source EN and the core network fails.
  • L2C connection anomaly protection method as shown in Figure 10.
  • the survival of the L2C connection is also monitored by the L2CP survival mechanism or other abnormality monitoring mechanism.
  • the specific process is shown in Figure 11.
  • step 1101 when the source EN is overloaded, or the aggregation network after the source EN fails, the controller detects that the L2C connection is abnormal.
  • Steps 1102 to 1106 are the same as steps 902 to 906, and are not described herein again.
  • the source EN can pass the context and status information of the L2C connection through the source EN.
  • the reference point or connection with the destination EN is migrated to the destination EN; and/or the source EN can migrate the context and status information of the IP session to the destination EN through a reference point or connection between the source EN and the destination EN.
  • the L2C connection between the controller and the source EN is replaced by a one-way connection from the controller to the source EN and a one-way connection from the source EN to the destination EN, as shown in Figure 10 Shown in the dotted line.
  • the controller sends the L2C packet or the IP session packet whose source address is the source EN to the source EN, but the L2C packet or the IP session packet is not terminated by the source EN, but is The source EN is transferred to the destination EN for subsequent transmission or processing by the destination EN.
  • step 1108 the context and status information of the L2C connection (including the IP session), and/or the context and status information of the IP session are migrated, ie, the handover is completed, and the L2C connection of the source EN is switched between the controller and the destination EN.
  • the bidirectional connection, and the bidirectional connection between the AN and the controller, the controller and the destination EN directly exchange L2C packets or IP session packets.
  • the seventh embodiment of the present invention relates to an L2C-connected abnormality protection system, as shown in FIG. 12, including: a monitoring unit 121 for monitoring EN and its connection in an access network; and a switching unit 122 for When the monitoring unit 121 finds that the L2C connection of the first EN is abnormal, the L2C connection on the first EN is switched to another normal EN. Therefore, when the L2C connection of the EN is faulty, it can be protected, and the L2C packet or the IP session packet can still be transmitted normally.
  • the switching unit includes the following subunit: an information transmission subunit 1221, configured to pass context and status information of the L2C connection on the first EN
  • an information transmission subunit 1221 configured to pass context and status information of the L2C connection on the first EN
  • a reference point or connection between the first EN and the normal EN is sent to the normal EN.
  • the system may further include: a requesting unit 123, configured to send a handover request of the L2C connection to the at least one other normal EN; and a receiving unit 124, configured to receive a response from the at least one other normal EN indicating that the handover is agreed; 125.
  • the method is used to select one of the normal ENs when the receiving unit receives the acknowledgement of the consent switch from the at least two normal ENs.
  • the switch indication unit 126 is configured to instruct the switching unit 122 to use the first EN.
  • the L2C connection is switched to the normal EN selected by the selection unit 125.
  • each logical unit may be a functional module in different physical devices in the network in actual applications, or may be different physical devices in the network.
  • the functional modules in the process are composed together.
  • the above-mentioned monitoring unit, switching unit, requesting unit, receiving unit, selecting unit and switching indicating unit may all be set in EN, and the EN controls the switching of the L2C connection by itself; or, an independent setting may be set in the system.
  • the controller is configured to set the above unit in the controller, and the controller uniformly controls the switching of the L2C connections of the EN; and the controller controls the switching of the L2C connection of the first EN to which normal EN, thereby You can select the most suitable EN to switch, so that "1 + 1" or " ⁇ + ⁇ backup or load sharing works best.
  • some of the above units can be set in EN, and some units are set in control. Or other network elements in the access network.
  • the EN and its connection in the access network are monitored. If the source EN is found to be abnormal, the L2C connection on the source EN is switched to other normal EN, thereby making EN The L2C connection can be protected when it is faulty. The L2C packet or IP session packet can still be transmitted normally.
  • the L2C connection is bidirectionally between the AN and the normal EN before the handover is completed.
  • the connection and the normal bidirectional connection between the EN and the source EN are replaced; if the source EN is abnormal because the connection between the source EN and the core network is faulty, or the source EN is overloaded, the L2C connection is from the AN to the source before the handover is completed.
  • the L2C connection is established between the source EN and the controller, and between the controller and the AN, if the cause of the source EN abnormality is a connection failure between the source EN and the controller, the L2C connection is made before the handover is completed.
  • the bidirectional connection between the controller and the normal EN, the normal bidirectional connection between the EN and the source EN is replaced; if the source EN is abnormal due to a connection failure between the source EN and the core network, or the source EN is overloaded, then Before the handover is completed, the L2C connection is replaced by a one-way connection from the controller to the source EN, and a one-way connection from the source EN to the normal EN. Therefore, L2C packets or IP session packets can be transmitted normally during the L2C connection switchover.
  • controller it is possible for the controller to coordinate which of the normal ENs the source EN's L2C connection is switched to, so that the most appropriate EN can be selected for switching, such that "1 + 1" or "N + 1" backup or load sharing best effect.
  • the source EN choose which of the normal ENs to switch the L2C connection to, which is more independent and reduces the burden on the controller.

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  • Signal Processing (AREA)
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Description

层 2控制连接的异常保护方法和系统
本申请要求于 2007 年 8 月 22 日提交中国专利局、 申请号为 200710076514.5、 发明名称为 "层 2控制连接的异常保护方法和系统" 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
本发明涉及通信领域, 特别涉及层 2控制连接的异常保护技术。
背景技术
接入网通用参考架构如图 1所示。其中,用户驻地网络( Customer Premises Network, 简称 "CPN" ) 由用户设备 ( User Equipment, 简称 "UE" )和驻地 网关 RG组成;接入网( Access Network )由接入节点( Access Node ,简称 "AN" ) 和边缘节点 (Broadband Remote Access Server, 简称 "EN" )及两者间的汇聚 网络 ( Aggregation Network ) 组成。 对于 ϋ波接入全球互通 (Worldwide Interoperability for Microwave Access, 简称 "WiMAX" )网络, EN通常为接入 服务网络网关 ( Access Service Network Gate Way, 简称 "ASN GW" ), AN通 常为基站( Base Station,简称 "BS" );对于数字用户线( Digital Subscriber Line, 简称 "DSL" )网络, EN通常为宽带远程接入服务器( Broadband Remote Access Server , 简称 "BRAS " )或宽带网络网关( Broadband Network Gateway , 简称 "BNG" ), AN通常为数字用户线接入复用器( Digital Subscriber Line Access Multiplexer, 简称 "DSLAM" )。
随着通信技术的发展, 接入网为支持新的业务, 需要在接入网的设备(包 括 AN和 EN )上增加控制。 由于对接入网的每一个设备分别进行控制会产生 较大负担, 为了减少这部分负担, 现有技术釆用层二控制协议(Layer2 Control Protocol, 简称 "L2CP" ), 通过 BRAS控制接入网中大量的 AN。 目前, L2CP 主要用于拓朴发现、 线路配置、 线路测试和组播控制。
根据 L2CP协议,现有技术通过接入网的 AN与 EN之间建立的 L2C连接, 来实现对 AN和 EN的控制 ,进行 L2C报文或网间互联协议( Internet Protocol, 简称 "IP" )会话报文的交互。 然而本发明的发明人发现, 现有技术中不存在 L2C连接的相关保护技术, 一旦 L2C连接发生异常, 将如何保护报文的正常 传输, 成为急待解决的问题。 发明内容
本发明实施方式要解决的主要技术问题是提供一种层 2 控制连接的异常 保护方法和系统, 使得 L2C连接异常时可以得到保护。
为解决上述技术问题,本发明的实施方式提供了一种层 2控制连接的异常 保护方法, 包括以下步骤:
对接入网中的边缘节点和 /或边缘节点的连接进行监测;
如果发现第一边缘节点的层 2控制连接异常, 则将第一边缘节点上的层 2 控制连接切换到其它正常的边缘节点, 以实现所述边缘节点的 "1 + 1" 的备 份或负荷分担, 或实现所述边缘节点的 "N + 1" 的备份或负荷分担。
本发明的实施方式还提供了一种层 2控制连接的异常保护系统, 包括: 监测单元, 用于对接入网中的边缘节点和 /或该边缘节点的连接进行监测; 切换单元, 用于在监测单元发现第一边缘节点异常时,将该第一边缘节点 上的层 2控制连接切换到其它正常的边缘节点,以实现所述边缘节点的" 1 + 1" 的备份或负荷分担, 或 "N + 1" 的备份或负荷分担。
本发明实施方式与现有技术相比, 主要区别及其效果在于:
对接入网中的 EN和 /或该 EN的连接进行监测, 如果发现第一 EN的 L2C 连接异常, 则将第一 EN上的 L2C连接切换到其它正常的 EN, 从而使得 EN 的 L2C连接发生故障时可以得到保护,仍然能够正常传输 L2C报文或 IP会话 报文。
附图说明
图 1是现有技术中接入网通用参考架构示意图;
图 2是根据本发明第一实施方式的 L2C连接的异常保护方法中的连接故 障示意图;
图 3是根据本发明第一实施方式的 L2C连接的异常保护方法流程图; 图 4是根据本发明第二实施方式的 L2C连接的异常保护方法流程图; 图 5是根据本发明第三实施方式的 L2C连接的异常保护方法中的连接故 障示意图;
图 6是根据本发明第三实施方式的 L2C连接的异常保护方法流程图; 图 7是根据本发明第四实施方式的 L2C连接的异常保护方法流程图; 图 8是根据本发明第五实施方式的 L2C连接的异常保护方法中的连接故 障示意图;
图 9是根据本发明第五实施方式的 L2C连接的异常保护方法流程图; 图 10是根据本发明第六实施方式的 L2C连接的异常保护方法中的连接故 障示意图;
图 11是根据本发明第六实施方式的 L2C连接的异常保护方法流程图; 图 12是根据本发明第七实施方式的 L2C连接的异常保护系统结构图。 具体实施方式
为使本发明的目的、技术方案和优点更加清楚, 下面将结合附图对本发明 的实施方式作进一步地详细描述。
本发明第一实施方式涉及一种 L2C连接的异常保护方法。 在本实施方式 中, 在接入网中的各 EN间建立参考点或连接, 如图 2所示的 EN1和 EN2之 间即存在参考点或连接, 多个 EN通过控制器 (Controller )进行协调, 实现 EN的 "1 + 1" 或 "N + 1" 备份, 即 1个 EN对应 1个备用 EN, 或 N个 EN 对应一个备用 EN。
图 2中, L2C连接建立于 AN和源 EN ( EN1 )之间, 通过 L2CP的存活 监控机制或其它异常监控机制检测 L2C连接的存活。 具体流程如图 3所示。
在步骤 301中, 当 AN和源 EN之间的汇聚网络存在故障时, 源 EN将检 测出 L2C连接异常。
在步骤 302中, 源 EN向控制器上报 L2C连接异常。
在步骤 303中, 控制器向一个或多个目的 EN (如 EN2 )发送切换请求。 在步骤 304中, 目的 EN收到该切换请求后, 向 AN转发该切换请求。 在步骤 305中, 目的 EN或控制器对源 EN切换所需的资源进行分配。 步 骤 305可以在步骤 304之前执行, 也可以在步骤 304和步骤 306之间执行。
在步骤 306中, AN收到来自目的 EN的切换请求后, AN完成切换前的 资源预留, 之后, 向目的 EN发送切换应答, 同意切换源 EN的 L2C连接。
在步骤 307中, 当目的 EN收到 AN的切换应答, 且目的 EN上的资源分 配完成之后, 向控制器发送切换应答, 该切换应答表示同意切换源 EN的 L2C 连接。 在步骤 308中, 控制器可能收到来自多个目的 EN的切换应答, 控制器可 以进行切换决策选择合适的目的 EN, 如果控制器仅收到一个目的 EN的切换 应答,步骤 308可以省略。切换决策的方法有很多,可以釆用先来先选的方式, 即控制器选择最先收到的切换应答对应的目的 EN; 或者, 也可以釆用最优选 择方式, 即控制器根据收到的切换应答, 选择资源分配最优的目的 EN, 如资 源分配最充足的目的 EN。
在步骤 309中, 控制器向源 EN下达切换到相应目的 EN的切换命令, 该 切换命令中包含切换到的目的 EN的标识,启动 L2C连接的切换过程, 即 L2C 的连接开始发生变化。
在步骤 310中, 源 EN向 AN发送切换命令。
在步骤 311中, 源 EN可以将 L2C连接的上下文和状态信息, 通过源 EN 与目的 EN间的参考点或连接, 迁移到目的 EN。 和 /或源 EN可以将 IP会话的 上下文和状态信息,通过源 EN与目的 EN间的参考点或连接,迁移到目的 EN。 该目的 EN即为源 EN的备份 EN。在本实施方式中, 不同的源 EN可以通过不 同的 EN进行备份, 即实现 "1 + 1" 备份; 或者, 不同的源 EN也可以通过同 一个 EN进行备份, 即实现 "N + 1" 备份。
在启动 L2C连接的切换过程后, 到完成切换之前, AN和源 EN之间的 L2C连接由 AN与目的 EN之间的双向连接、 和目的 EN与源 EN之间的双向 连接替代, 如图 2中虚线部分所示。 具体地说, 在切换完成之前, AN将目的 地址为源 EN的 L2C报文或 IP会话报文发往目的 EN, 但该 L2C报文或 IP会 话报文不在目的 EN终结 , 而是经目的 EN中转到源 EN, 由源 EN进行后续传 输或处理; 另一方面, 源 EN将目的地址为 AN的 L2C报文或 IP会话报文发 送给目的 EN, 经目的 EN中转到 AN。
在步骤 312中, L2C连接的上下文和状态信息, 和 /或将 IP会话的上下文 和状态信息迁移完成,即切换完成, 目的 EN向 AN发送表示切换完成的指示, 通知 AN当前的 L2C连接已切换到 AN和目的 EN之间的双向连接上 , AN与 目的 EN之间可以直接交互 L2C报文或 IP会话报文。
可见, 通过对接入网中的 EN及其连接进行监测, 在发现 EN的 L2C连接 异常时, 将该 EN上的 L2C连接切换到其它正常的 EN, 使得 EN的 L2C连接 发生故障时可以得到保护, 仍然能够正常传输 L2C报文或 IP会话报文。
本发明第二实施方式同样涉及一种 L2C连接的异常保护方法, 与第一实 施方式大致相同, 其区别在于, 在第一实施方式中, 由控制器参与源 EN 的 L2C连接的切换, 也就是说, 在源 EN发现异常时, 向控制器进行上报, 由控 制器向一个或多个目的 EN发送切换请求; 而在本实施方式中, 不设置独立的 控制器统一协调该 L2C连接切换过程, 由 EN自行控制其 L2C连接切换过程。
具体流程如图 4所示, 步骤 401与步骤 301相同, 在此不再赘述。
在步骤 402中, 源 EN向目的 EN发送切换请求。
在步骤 403中, 目的 EN收到该切换请求后, 向 AN转发该切换请求。 在步骤 404中, 目的 EN对源 EN切换所需的资源进行分配。 步骤 404可 以在步骤 403之前执行, 也可以在步骤 403和步骤 405之间执行。
在步骤 405中, AN收到来自目的 EN的切换请求后, AN完成切换前的 资源预留, 之后, 向目的 EN发送切换应答, 该切换应答表示同意切换源 EN 的 L2C连接。
在步骤 406中, 当目的 EN收到 AN的切换应答, 并且目的 EN上的资源 分配完成之后, 向源 EN发送切换应答, 该切换应答表示同意切换 EN。
在步骤 407中, 源 EN可能收到来自多个目的 EN的切换应答, 源 EN可 以进行切换决策选择合适的目的 EN, 源 EN可以向目的 EN发送切换命令, 表明选中了该目的 EN。
在步骤 408中, 源 EN向 AN发送切换命令, 该切换命令中包含切换到的 目的 EN的标识, 启动 L2C连接的切换过程, 即 L2C的连接开始发生变化。
步骤 409和步骤 410与步骤 311和步骤 312相同, 在此不再赘述。
本发明第三实施方式同样涉及一种 L2C连接的异常保护方法, 在接入网 中的各 EN间建立参考点或连接, 多个 EN通过控制器( Controller )进行协调, 实现 EN的 "1 + 1" 或 "Ν + Γ 备份或负荷分担。
本实施方式与第一实施方式大致相同, 其区别在于, 第一实施方式中, 描 述的是当源 EN与 AN之间的汇聚网络存在故障时, L2C连接的异常保护方法; 而本实施方式中, 描述的是当源 EN过载, 或源 EN之后的汇聚网络出现故障 时,如源 EN与核心网之间的汇聚网络出现故障时, L2C连接的异常保护方法, 如图 5所示。
在本实施方式中, 同样通过 L2CP的存活监控机制或其它异常监控机制检 测 L2C连接的存活。 具体流程如图 6所示。
在步骤 601中, 当源 EN过载, 或源 EN之后的汇聚网络出现故障时, 源 EN将检测出 L2C连接异常。
步骤 602至步骤 610与步骤 302至步骤 310相同, 在此不再赘述。
在步骤 611中, 源 EN可以将 L2C连接的上下文和状态信息, 通过源 EN 与目的 EN间的参考点或连接, 迁移往目的 EN; 和 /或源 EN可以将 IP会话的 上下文和状态信息,通过源 EN与目的 EN间的参考点或连接,迁移往目的 EN。
在启动 L2C连接的切换过程后, 到完成切换之前, AN和源 EN之间的
L2C连接由 AN到源 EN的单向连接、 和源 EN到目的 EN的单向连接替代, 如图 5中虚线部分所示。 具体地说, 在切换完成之前(即步骤 612之前), AN 还是将目的地址为源 EN的 L2C报文或 IP会话报文发往源 EN, 但该 L2C报 文或 IP会话报文不在源 EN终结, 而是经源 EN中转往目的 EN, 由目的 EN 进行后续传输或处理。
在步骤 612中, L2C连接的上下文和状态信息, 和 /或将 IP会话的上下文 和状态信息迁移完成,即切换完成, 目的 EN向 AN发送表示切换完成的指示, 通知 AN当前的 L2C连接已切换到 AN和目的 EN之间的双向连接上 , AN与 目的 EN之间可以直接交互 L2C报文或 IP会话报文。
本发明第四实施方式同样涉及一种 L2C连接的异常保护方法, 在接入网 中的各 EN间建立参考点或连接, 多个 EN通过控制器( Controller )进行协调, 实现 EN的 "1 + 1" 或 "N + Γ 备份或负荷分担。
本实施方式与第二实施方式大致相同, 其区别在于, 在第二实施方式中, 描述的是当源 EN与 AN之间的汇聚网络存在故障时, L2C连接的异常保护方 法; 而本实施方式中, 描述的是当源 EN过载, 或源 EN之后的汇聚网络出现 故障时, 如源 EN与核心网之间的汇聚网络出现故障时, L2C连接的异常保护 方法。
在本实施方式中, 同样通过 L2CP的存活监控机制或其它异常监控机制检 测 L2C连接的存活。 具体流程如图 7所示。 在步骤 701中, 当源 EN过载, 或源 EN之后的汇聚网络出现故障时, 源 EN将检测出 L2C连接异常。
步骤 702至步骤 708与步骤 402至步骤 408相同, 在此不再赘述。
在步骤 709中, 源 EN可以将 L2C连接的上下文和状态信息, 通过源 EN 与目的 EN间的参考点或连接, 迁移往目的 EN; 和 /或源 EN可以将 IP会话的 上下文和状态信息,通过源 EN与目的 EN间的参考点或连接,迁移往目的 EN。
在启动 L2C连接的切换过程后, 到完成切换之前, AN和源 EN之间的 L2C连接由 AN到源 EN的单向连接、 和源 EN到目的 EN的单向连接替代, 如图 5中虚线部分所示。 具体地说, 在切换完成之前, AN还是将目的地址为 源 EN的 L2C报文或 IP会话报文发往源 EN, 但该 L2C报文或 IP会话报文不 在源 EN终结,而是经源 EN中转往目的 EN,由目的 EN进行后续传输或处理。
在步骤 710中, L2C连接的上下文和状态信息, 和 /或 IP会话的上下文和 状态信息迁移完成, 即切换完成, 目的 EN向 AN发送表示切换完成的指示, 通知 AN当前的 L2C连接已切换到 AN和目的 EN之间的双向连接上 , AN与 目的 EN之间可以直接交互 L2C报文或 IP会话报文。
本发明第五实施方式同样涉及一种 L2C连接的异常保护方法。 本实施方 式与第一实施方式相类似, 在本实施方式中, 同样需要在接入网中的各 EN间 建立参考点或连接, 多个 EN通过控制器(Controller ) 的协调, 实现 IP边缘 节点的 "1 + 1" 或 "Ν + Γ 备份; 其区别在于, 本实施方式中的控制器位于 汇聚交换机(Aggregation Switch, 简称 "AGS" ), 如图 8所示。
当控制器和 EN之间的汇聚网络存在故障时, 相应 EN备份切换流程如图 9所示。
在本实施方式中,源 EN的 L2C连接承载在 AN与控制器之间的双向连接 和控制器与源 EN之间的双向连接上, 通过 L2CP的存活机制或其它异常监控 机制监控检测 L2CP的存活; 在步骤 901中, 当控制器和源 EN之间的汇聚网 络存在故障时 , 控制器将检测出 L2C连接异常。
在步骤 902中, 控制器向一个或多个目的 EN发送切换请求。
在步骤 903中, 目的 EN或控制器对 EN切换所需的资源进行分配。
在步骤 904中, 当目的 EN上的资源分配完成之后, 目的 EN向控制器发 送切换应答, 该切换应答表示同意切换源 EN的 L2C连接。
在步骤 905中, 控制器可能收到来自多个目的 EN的切换应答, 控制器进 行切换决策选择合适的目的 EN。
在步骤 906中,控制器向源 EN下达切换到所选择的目的 EN的切换命令, 该切换命令中包含切换到的目的 EN的标识, 启动切换过程。
在步骤 907中, 源 EN可以将 L2C连接的上下文和状态信息, 通过源 EN 与目的 EN间的参考点或连接, 迁移往目的 EN; 和 /或源 EN可以将 IP会话的 上下文和状态信息,通过源 EN与目的 EN间的参考点或连接,迁移往目的 EN。
在启动 L2C连接的切换过程后,到完成切换之前,控制器和源 EN之间的 L2C连接由控制器与目的 EN之间的双向连接、 和目的 EN与源 EN之间的双 向连接替代, 如图 8中虚线部分所示。 具体地说, 在切换完成之前, 控制器将 目的地址为源 EN的 L2C报文或 IP会话报文发往目的 EN, 但该 L2C报文或 IP会话报文不在目的 EN终结, 而是经目的 EN中转往源 EN, 由源 EN进行 后续传输或处理; 另一方面, 源 EN将目的地址为 AN的 L2C报文或 IP会话 报文发往目的 EN, 经目的 EN中转往控制器, 再传输给 AN。
在步骤 908中, L2C连接 (包括 IP会话 )的上下文和状态信息, 和 /或 IP 会话的上下文和状态信息迁移完成, 即切换完成, 源 EN的 L2C连接切换到目 的 EN与控制器之间的双向连接上, 和控制器与 AN之间的双向连接, 控制器 与目的 EN间可以直接交互 L2C报文或 IP会话报文。
本发明第六实施方式同样涉及一种 L2C连接的异常保护方法, 与第五实 施方式大致相同, 其区别在于, 在第五实施方式中, 描述的是当源 EN与控制 器之间的汇聚网络存在故障时, L2C连接的异常保护方法; 而本实施方式中, 描述的是当源 EN过载, 或源 EN之后的汇聚网络出现故障时, 如源 EN与核 心网之间的汇聚网络出现故障时, L2C连接的异常保护方法, 如图 10所示。
在本实施方式中, 同样通过 L2CP的存活机制或其它异常监控机制监控检 测 L2C连接的存活。 具体流程如图 11所示, 在步骤 1101中, 当源 EN过载, 或源 EN之后的汇聚网络出现故障时, 控制器将检测出 L2C连接异常。
步骤 1102至步骤 1106与步骤 902至步骤 906相同, 在此不再赘述。
在步骤 1107中,源 EN可以将 L2C连接的上下文和状态信息,通过源 EN 与目的 EN间的参考点或连接, 迁移往目的 EN; 和 /或源 EN可以将 IP会话的 上下文和状态信息,通过源 EN与目的 EN间的参考点或连接,迁移往目的 EN。
在启动 L2C连接的切换过程后,到完成切换之前,控制器和源 EN之间的 L2C连接由控制器到源 EN的单向连接、和源 EN到目的 EN的单向连接替代, 如图 10中虚线部分所示。 具体地说, 在切换完成之前, 控制器还是将目的地 址为源 EN的 L2C报文或 IP会话报文发往源 EN, 但该 L2C报文或 IP会话报 文不在源 EN终结, 而是经源 EN中转往目的 EN, 由目的 EN进行后续传输或 处理。
在步骤 1108中, L2C连接 (包括 IP会话 ) 的上下文和状态信息, 和 /或 IP会话的上下文和状态信息迁移完成, 即切换完成, 源 EN的 L2C连接切换 到控制器与目的 EN之间的双向连接、 和 AN与控制器之间的双向连接上, 控 制器与目的 EN之间直接交互 L2C报文或 IP会话报文。
本发明第七实施方式涉及一种 L2C连接的异常保护系统, 如图 12所示, 包括:监测单元 121 ,用于对接入网中的 EN及其连接进行监测;切换单元 122, 用于在该监测单元 121发现第一 EN的 L2C连接异常时, 将该第一 EN上的 L2C连接切换到其它正常的 EN。 从而使得 EN的 L2C连接发生故障时可以得 到保护, 仍然能够正常传输 L2C报文或 IP会话报文。
其中, 该第一 EN与该正常的 EN间存在参考点或连接; 该切换单元包括 以下子单元: 信息传输子单元 1221 , 用于将该第一 EN上的 L2C连接的上下 文和状态信息, 通过该第一 EN与该正常的 EN间的参考点或连接, 发送到该 正常的 EN。
该系统还可以包括: 请求单元 123 , 用于向至少一个其它正常的 EN发送 L2C 连接的切换请求; 接收单元 124, 用于接收来自至少一个该其它正常的 EN的表示同意切换的应答; 选择单元 125, 用于在该接收单元从至少两个该 正常的 EN收到该示同意切换的应答时, 从这些正常的 EN中选择一个; 切换 指示单元 126,用于指示切换单元 122将第一 EN的 L2C连接切换到该选择单 元 125选中的正常的 EN。
需要说明的是本实施方式中的单元均为逻辑单元,每个逻辑单元在实际应 用中可以是网络中不同物理设备中的功能模块,也可以由网络中不同物理设备 中的功能模块共同组成。
比如说, 上述的监测单元、 切换单元、 请求单元、 接收单元、 选择单元和 切换指示单元可以全部设置在 EN中,由 EN自行控制 L2C连接的切换;或者, 也可以在该系统中设置一个独立的控制器,将上述单元设置在该控制器中, 由 该控制器统一控制各 EN的 L2C连接的切换; 通过由控制器来协调将第一 EN 的 L2C连接的切换到哪个正常的 EN, 从而可以选择最合适的 EN进行切换, 使得 "1 + 1" 或 "Ν + Γ 备份或负荷分担的效果最好。 或者, 也可以将上述 单元中的部分单元设置在 EN中,部分单元设置在控制器或接入网中的其它网 元中。
综上所述,在本发明的实施方式中 ,对接入网中的 EN及其连接进行监测 , 如果发现源 EN异常, 则将源 EN上的 L2C连接切换到其它正常的 EN, 从而 使得 EN的 L2C连接发生故障时可以得到保护, 仍然能够正常传输 L2C报文 或 IP会话报文。
对于 L2C连接建立于源 EN和 AN之间的情况,如果源 EN异常的原因是 源 EN与 AN之间的网络连接故障, 则在切换完成之前, L2C连接由 AN与正 常的 EN之间的双向连接和正常的 EN与源 EN之间的双向连接替代; 如果源 EN异常的原因是源 EN与核心网之间的连接故障, 或源 EN过载, 则在切换 完成之前, L2C连接由 AN到源 EN的单向连接和源 EN到正常的 EN的单向 连接组成。从而在 L2C连接切换的过程中, 也能正常传输 L2C报文或 IP会话 报文。
对于 L2C连接建立于源 EN与控制器之间、 和控制器与 AN之间的情况, 如果源 EN异常的原因为源 EN与控制器之间的连接故障,则在切换完成之前, L2C连接由控制器与正常的 EN之间的双向连接、 正常的 EN与源 EN之间的 双向连接替代; 如果源 EN异常的原因为源 EN与核心网之间的连接故障, 或 源 EN过载, 则在切换完成之前, L2C连接由控制器到源 EN的单向连接、 源 EN到正常的 EN的单向连接替代。 从而在 L2C连接切换的过程中, 也能正常 传输 L2C报文或 IP会话报文。
可以由控制器来协调将源 EN的 L2C连接的切换到哪个正常的 EN, 从而 可以选择最合适的 EN进行切换, 使得 "1 + 1" 或 "N + 1"备份或负荷分担的 效果最好。
也可以由源 EN自行选择将 L2C连接的切换到哪个正常的 EN, 该方式的 独立性更好, 减少了控制器的负担。
虽然通过参照本发明的某些优选实施方式,已经对本发明进行了图示和描 述,但本领域的普通技术人员应该明白, 可以在形式上和细节上对其作各种改 变, 而不偏离本发明的精神和范围。

Claims

权 利 要 求
1. 一种层 2控制连接的异常保护方法, 其特征在于, 包括以下步骤: 对接入网中的边缘节点和 /或边缘节点的连接进行监测;
如果发现第一边缘节点的层 2控制连接异常,则将该第一边缘节点上的层 2控制连接切换到其它正常的边缘节点, 以实现所述边缘节点的 " 1 + Γ 的 备份或负荷分担, 或实现所述边缘节点的 "N + 1 " 的备份或负荷分担。
2. 根据权利要求 1所述的层 2控制连接的异常保护方法, 其特征在于, 所述接入网中的边缘节点为宽带接入服务器或宽带网络网关。
3. 根据权利要求 1所述的层 2控制连接的异常保护方法, 其特征在于, 所述对接入网中的边缘节点和 /或该边缘节点的连接进行监测包括:
釆用层 2控制协议的存活监控机制对接入网中的边缘节点和 /或该边缘节 点的连接进行监测。
4. 根据权利要求 1所述的层 2控制连接的异常保护方法, 其特征在于, 所述将该第一边缘节点上的层 2控制连接切换到其它正常的边缘节点的步骤 中, 还包括以下子步骤:
将所述第一边缘节点上的状态信息,通过该第一边缘节点与所述正常的边 缘节点间的参考点或连接, 发送到所述正常的边缘节点。
5. 根据权利要求 4所述的层 2控制连接的异常保护方法, 其特征在于, 所述第一边缘节点上的状态信息包括层 2控制连接和 /或 IP会话的状态信息。
6. 根据权利要求 1至 5任一项所述的层 2控制连接的异常保护方法, 其 特征在于,
所述发现第一边缘节点的层 2控制连接异常的步骤中,发现所述第一边缘 节点与所述接入节点之间的网络连接发生异常 ,或发现所述第一边缘节点与核 心网之间的网络连接发生异常, 或发现所述第一边缘节点超载;
所述切换的步骤中,将所述第一边缘节点与所述接入节点之间的双向连接 上的所述层 2控制连接,切换到所述正常的边缘节点与所述接入节点之间的双 向连接上。
7. 根据权利要求 6所述的层 2控制连接的异常保护方法, 其特征在于, 所述发现第一边缘节点的层 2控制连接异常的步骤中,发现所述第一边缘节点 与所述接入节点之间的网络连接发生异常; 所述切换的步骤完成之前, 所述接 入节点和所述第一边缘节点通过所述接入节点与所述正常的边缘节点之间的 双向连接和所述正常的边缘节点与所述第一边缘节点之间的双向连接进行才艮 文交互; 或者
所述发现第一边缘节点的层 2控制连接异常的步骤中,发现所述第一边缘 节点与核心网之间的网络连接发生异常, 或所述第一边缘节点超载; 所述切换 的步骤完成之前 ,所述接入节点通过所述接入节点到所述第一边缘节点的单向 连接和所述第一边缘节点到所述正常的边缘节点的单向连接向所述第一边缘 节点发送报文。
8. 根据权利要求 6所述的层 2控制连接的异常保护方法, 其特征在于, 所述切换的步骤之前, 还包括以下步骤:
所述第一边缘节点连接的控制器在发现该第一边缘节点的层 2控制连接 异常时, 向所述其它正常的边缘节点发送层 2控制连接的切换请求;
如果所述正常的边缘节点收到来自所述接入节点的表示同意切换的指示, 且所述正常的边缘节点上完成了切换所述层 2控制连接所需的资源分配,则该 正常的边缘节点向所述控制器发送所述表示同意切换的应答;
所述控制器在收到所述表示同意切换的应答后,向所述第一边缘节点发送 切换到正常的边缘节点的指示。
9. 根据权利要求 6所述的层 2控制连接的异常保护方法, 其特征在于, 所述切换的步骤之前, 还包括以下步骤:
所述第一边缘节点在发现其层 2控制连接异常时,向所述其它正常的边缘 节点发送层 2控制连接的切换请求;
如果所述正常的边缘节点收到来自所述接入节点的表示同意切换的指示, 且该正常的边缘节点上完成了切换所述层 2控制连接所需的资源分配,则该正 常的边缘节点向所述第一边缘节点发送切换到本边缘节点的指示。
10. 根据权利要求 1至 5任一项所述的层 2控制连接的异常保护方法, 其 特征在于, 所述发现第一边缘节点的层 2控制连接异常的步骤中,发现所述第 一边缘节点与所述控制器之间的网络连接发生异常,或发现所述第一边缘节点 与核心网之间的网络连接发生异常, 或发现所述第一边缘节点超载; 所述切换的步骤中,将所述第一边缘节点与所述控制器之间的双向连接上 的所述层 2控制连接,切换到所述正常的边缘节点与所述控制器之间的双向连 接上。
11. 根据权利要求 10所述的层 2控制连接的异常保护方法, 其特征在于, 所述发现第一边缘节点的层 2控制连接异常的步骤中,发现所述第一边缘节点 与所述控制器之间的网络连接发生异常; 所述切换的步骤完成之前, 所述控制 器和所述第一边缘节点之间通过所述控制器与所述正常的边缘节点之间的双 向连接、所述正常的边缘节点与所述第一边缘节点之间的双向连接进行报文交 互;
所述发现第一边缘节点的层 2控制连接异常的步骤中,发现所述第一边缘 节点与核心网之间的网络连接发生异常, 或所述第一边缘节点超载; 所述切换 的步骤完成之前, 所述控制器通过所述控制器到所述第一边缘节点的单向连 接、所述第一边缘节点到所述正常的边缘节点的单向连接向所述第一边缘节点 发送报文。
12. 根据权利要求 10所述的层 2控制连接的异常保护方法, 其特征在于, 所述切换的步骤之前, 包括以下步骤:
所述控制器在发现所述第一边缘节点异常时,向所述其它正常的边缘节点 发送层 2控制连接的切换请求;
如果所述正常的边缘节点上完成了切换所述层 2 控制连接所需的资源分 配, 则该正常的边缘节点向所述控制器发送表示同意切换的应答;
所述控制器在收到所述表示同意切换的应答后,向所述第一边缘节点发送 切换到正常的边缘节点的指示。
13. 根据权利要求 8或 9或 12中任一项所述的层 2控制连接的异常保护 方法, 其特征在于, 所述发送切换请求的步骤中, 所述控制器或所述第一边缘 节点向至少两个所述正常的边缘节点发送所述切换请求;
如果所述控制器或所述第一边缘节点从至少两个所述正常的边缘节点收 到所述表示同意切换的应答, 则从这些正常的边缘节点中选择一个, 所述层 2 控制连接切换到所选择的正常的边缘节点。
14. 一种层 2控制连接的异常保护系统, 其特征在于, 包括: 监测单元, 用于对接入网中的边缘节点和 /或边缘节点的连接进行监测; 切换单元, 用于在所述监测单元发现第一边缘节点的层 2控制连接异常 时,将该第一边缘节点上的层 2控制连接切换到其它正常的边缘节点, 以实现 所述边缘节点的 "1 + 1" 的备份或负荷分担, 或 "N + 1" 的备份或负荷分担。
15. 根据权利要求 14所述的层 2控制连接的异常保护系统, 其特征在于, 所述检测单元和 /或所述切换单元在所述边缘节点中。
16. 根据权利要求 14所述的层 2控制连接的异常保护系统, 其特征在于, 该系统还包括控制器, 用于控制所述层 2控制连接的切换;
所述检测单元和 /或所述切换单元在所述控制器中。
17. 根据权利要求 14所述的层 2控制连接的异常保护系统, 其特征在于, 所述第一边缘节点与所述正常的边缘节点间存在参考点或连接;
所述切换单元包括以下子单元:
信息传输子单元, 用于将所述第一边缘节点上的状态信息,通过该第一边 缘节点与所述正常的边缘节点间的参考点或连接, 发送到所述正常的边缘节 点。
18. 根据权利要求 14所述的层 2控制连接的异常保护系统, 其特征在于, 还包括:
请求单元,用于向至少一个所述其它正常的边缘节点发送层 2控制连接的 切换请求;
接收单元,用于接收来自至少一个所述其它正常的边缘节点的表示同意切 换的应答;
切换指示单元, 用于根据所述接收单元收到的应答,指示所述切换单元将 所述层 2控制连接切换到发送所述应答的所述正常的边缘节点。
19. 根据权利要求 18所述的层 2控制连接的异常保护系统, 其特征在于, 还包括:
选择单元 ,用于在所述接收单元从至少两个所述正常的边缘节点收到所述 表示同意切换的应答时, 从这些正常的边缘节点中选择一个;
所述切换指示单元指示所述切换单元将所述层 2 控制连接切换到所述选 择单元选中的正常的边缘节点。
PCT/CN2008/072061 2007-08-22 2008-08-20 Procédé et système de protection contre les défaillances d'une connexion de commande de niveau 2 WO2009026829A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2415857A (en) 2004-06-30 2006-01-04 Zarlink Semiconductor Inc Rapid end-to-end failover in a packet switched network
WO2007073761A1 (en) 2005-12-28 2007-07-05 Telecom Italia S.P.A. Method and system for providing user access to communication services, and related computer program product
WO2007082552A1 (en) 2006-01-20 2007-07-26 Telecom Italia S.P.A A method and system for accounting access by users to data networks, related computer program product

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1949918A (zh) * 2005-10-11 2007-04-18 华为技术有限公司 一种两层节点网络架构下的双播切换方法和设备
JP4542045B2 (ja) * 2006-01-24 2010-09-08 アラクサラネットワークス株式会社 データ通信装置およびその方法
CN100454875C (zh) * 2006-08-24 2009-01-21 华为技术有限公司 一种用户网络边缘设备双归属或多归属的实现方法及系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2415857A (en) 2004-06-30 2006-01-04 Zarlink Semiconductor Inc Rapid end-to-end failover in a packet switched network
WO2007073761A1 (en) 2005-12-28 2007-07-05 Telecom Italia S.P.A. Method and system for providing user access to communication services, and related computer program product
WO2007082552A1 (en) 2006-01-20 2007-07-26 Telecom Italia S.P.A A method and system for accounting access by users to data networks, related computer program product

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SANJAY WADHWA ET AL., GSMP EXTENSIONS FOR ACCESS NODE CONTROL MECHANISM ., 22 October 2006 (2006-10-22) *
WEI LEPING, OPTICAL SYNCHRONOUS DIGITAL TRANSPORT NETWORK, December 1998 (1998-12-01), pages 159 - 160, ISBN: 7-115-07344-9 *

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