WO2008017223A1 - Procédé, appareil et réseau permettant de communiquer réciproquement des résultats de détection de pannes - Google Patents

Procédé, appareil et réseau permettant de communiquer réciproquement des résultats de détection de pannes Download PDF

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Publication number
WO2008017223A1
WO2008017223A1 PCT/CN2007/001267 CN2007001267W WO2008017223A1 WO 2008017223 A1 WO2008017223 A1 WO 2008017223A1 CN 2007001267 W CN2007001267 W CN 2007001267W WO 2008017223 A1 WO2008017223 A1 WO 2008017223A1
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WO
WIPO (PCT)
Prior art keywords
link
detection
status
state
module
Prior art date
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PCT/CN2007/001267
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English (en)
Chinese (zh)
Inventor
Kang Zi
Jinfeng Zhao
Quan Yu
Yang Zhang
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.)
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008017223A1 publication Critical patent/WO2008017223A1/fr

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    • 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
    • H04L41/0677—Localisation of faults

Definitions

  • the present invention relates to the field of network management, and in particular, to a method, device and network for interworking of fault detection results. Background of the invention
  • Ethernet technology is simple and easy to use, low in price, and bandwidth can be continuously improved. It has been widely used as a service or as a network structure in enterprise networks, metropolitan area networks, and wide area networks, but traditional Ethernet. The maintainability and operational capability are relatively weak. With the gradual expansion of Ethernet promotion, the demand for Ethernet operation, management and maintenance (OAM) functions is becoming stronger. OAM technology is a technology that provides operational and maintainable functions. It can automatically detect various failures in the network and then take corresponding remedial measures to avoid the expansion of faults or to minimize the negative effects caused by faults.
  • PWE3 Pseudo Wire Emulation Edge-to-Edge (PWE), originally known as Martini Draft, is an end-to-end Layer 2 service bearer technology, originally intended for multi-protocol label switching. Emulated Ethernet on (MPLS, Multi Protocol Label Switching). P E3 simulates various point-to-point services on a Packet Switched Network (PSN). The simulated service can be a telemetry data monitor.
  • MPLS Multi Protocol Label Switching
  • PWE3 uses the tunneling mechanism on the PSN to simulate the necessary attributes of a service.
  • the tunnel here is called a virtual line (PW, Pseudo Wire).
  • PWE3 can be a protocol data unit for a specific service
  • PDU Protocol Data Unit
  • the PDU contains simulation specific services. Required data and control information.
  • the operator can transfer all the transmission services to a converged network using the PWE3 mechanism, such as an IP/MPLS network. From the user's point of view, the PWE3 analog virtual line can be considered as a dedicated link or circuit.
  • ETHOAM Ethernet Operation, Management, and Maintenance
  • VLANs virtual local area networks
  • ETHOAM's fault detection function is through continuity.
  • the main functions of ETHOAM include: fault detection function, fault confirmation function (Ping), fault location and isolation function ( TraceRoute), fault notification and alarm suppression.
  • the BFD (Bidirectional Forwarding Detection) technology can solve the PW fault detection problem. Because of its simple detection mechanism, high flexibility and good versatility, BFD technology has obtained the fault detection in pseudowire simulation. A wide range of applications. BFD for PW is used as a fault detection mode. The fault detection is implemented by detecting Hello packets.
  • a basic ETH PWE3 network architecture is established.
  • the user edge (CE, Customer Edge) establishes a PW between CE1 and CE2.
  • CE1, CE2 and the provider edge (PE, Provider Edge) PE1 and PE2 respectively Ethernet access, here does not distinguish the specific signaling implementation of PW, only a simple PW between PE1 and PE2.
  • the ETHOAM fault detection mechanism can be used to detect the fast faults of the Ethernet link between CE1 and PE1.
  • the BFD for PW detection technology can be used to detect fast faults on the PW link.
  • the detection mechanism between CE2 and PE2 is related to CE1 and PE1. The detection mechanism is the same.
  • Embodiments of the present invention provide a method for interworking of fault detection results to solve the problem of interworking of fault detection results in a network.
  • the method for interworking the fault detection results is applied to a network including at least one first link and at least one second link, where the first link and the second link are adjacent links, and the method includes Establishing a state association of the first link and the second link; when the first link fails, setting a state of the first link according to the state association; searching for the state in the state association The state of the first link is set according to the state of the first link, and the detection packet is sent to the second link.
  • Embodiments of the present invention provide a fault detection result interworking device.
  • the fault detection result interworking device is applied to a network including at least one first link and at least one second link, where the first link and the second link are adjacent links, and the fault is
  • the detection result interworking device includes:
  • An initialization module configured to establish a state association between the first link and the second link
  • a link detection module configured to detect a state of the first link
  • a status bit setting module configured to receive a status of the first link sent by the link detection module, and when the first link fails, set a status of the first link according to the status association ;
  • a status bit viewing module configured to view a status of the first link according to the status association before sending the detection message to the second link
  • a detection packet sending module configured to: after receiving the state of the first link sent by the status bit viewing module, set a detection packet according to a state of the first link, and send the detection packet to the second link Send a test packet.
  • the network includes: at least one first link and at least one second link, wherein the first link and the second link are adjacent, at least one is located in the first link and the second link a node at the junction of the road, wherein the node includes: an initialization module, configured to establish a state association of the first link and the second link; and a link detection module, configured to detect the first a status of the link; a status bit setting module, configured to receive a status of the first link sent by the link detection module, and when the first link fails, set the first according to the status association a status of a link; a status bit viewing module, configured to view a status of the first link according to the status association before sending a detection packet to the second link; and detecting a message sending module, configured to After receiving the state of the first link sent by the status bit viewing module, the detection packet is set according to the state of the first link, and the detection packet is sent to the second link.
  • an initialization module configured to establish a state association of the first link and the second link
  • the network is an Ethernet PWE3 network, the first link is a virtual line link, and the second link is an access link AC; or the first link is a virtual line link AC, and the second link is Access link PW.
  • Figure 1 is a network architecture diagram of ETH PWE3
  • FIG. 2 is a flow chart of a method according to an embodiment of the present invention.
  • FIG. 3 is a flow chart of a method according to an embodiment of the present invention.
  • FIG. 4 is a flow chart of a method according to an embodiment of the present invention.
  • Figure 5 is a flow chart of a method of an embodiment of the present invention.
  • FIG. 6 is a structural diagram of an apparatus for intercommunicating fault detection results in an embodiment of the present invention. Mode for carrying out the invention
  • the ETHOAM used between the CE and the PE is a symmetric model because the two sides of the AC link continuously send CCM messages to each other. Therefore, the network architecture of the ETH PWE3 is a symmetric model.
  • the control plane and the forwarding plane of most routers are separated.
  • the detection performed by BFD for PW and ETHOAM is performed by the forwarding plane.
  • BFD The faults detected by the PW and ETHOAM require the forwarding plane to directly change the associated link state table and report it to the control plane. In this case, some processing is required at the junctions, such as PE1 and PE2, to achieve end-to-end fast interworking.
  • a linearly indexed PW and AC state table is established on the common data area at the junction of the PW link and the AC link, and the indexes of the PW and AC state tables are associated with the corresponding BFD and On the instance table of ETHOAM detection, check the PW or AC status bits in the corresponding PW and AC status tables for BFD and ETHOAM detection, and send detection packets based on the PW or AC status bits.
  • the method of advertising the fault detection result to the AC link and the method of advertising the fault detection result to the AC link includes the following steps.
  • Step 101 Create a linear index PW and AC state table in the common data area on PE1 and PE2, and associate the PW and AC state table indexes with the corresponding BFD detection instance table and the ETHOAM detection instance table.
  • Step 102 The BFD detection technology is used to detect the link PW, and when the PE1 is detected. When the link between the device and PE2 fails, go to step 103.
  • Step 103 PE1 and PE2 search for the corresponding PW and AC status tables according to the PW and AC status table indexes on the BFD detection instance table, and set the PW status bit to DOWN.
  • Step 104 The ETHOAM detection technology is used to detect the AC link.
  • the PE1 and the PE2 respectively search the corresponding PW and AC status tables according to the indexes of the PW and the AC status table on the ETHOAM detection instance table, and view the corresponding PW and AC.
  • the PW status bit in the status table > according to the PW status bit, send CCM messages with remote fault indication (RDI, Remote Defect Indication) flag 1 or type length value (TLV, Type Length Value) to CE1 and CE2 respectively.
  • the type of the TLV may be 3, indicating the interface TLV, and the length may be 1. According to the information contained in the TLV, it may be determined whether the link is faulty, that is, when the value of the TLV is 2, the link is faulty.
  • Step 105 After receiving the CCM message with the RDI flag bit 1 or the CCM message containing the TLV, CE1 and CE2 know that the link is faulty. If there is a backup link, CE1 and CE2 quickly switch to Backup link, otherwise the link is reported to be faulty.
  • a remote AC link (a link between PE2 and CE2) fails, that is, when PE2 does not receive the CCM packet from CE2, or the CCM packet with the RDI flag is 1 or the CCM packet with the TLV sent by CE2.
  • the fault detection result is advertised to the near-end AC link.
  • the method of (the link between PE1 and CE1) includes the following specific steps.
  • Step 201 Establish a linear index PW and AC state table in the common data area on PE1 and PE2, and associate the indexes of the PW and the AC state table to the instance table corresponding to the BFD detection and the ETHOAM detection.
  • Step 202 The ETHOAM detection technology is used to detect the remote AC link. When it is detected that the link between PE2 and CE2 is faulty, go to step 203.
  • Step 203 PE2 searches for the corresponding PW and AC status table according to the indexes of the PW and AC status tables on the ETHOAM detection instance table, and sets the AC status bits in the PW and AC status tables to DOWN.
  • Step 204 The BFD detection technology is used to detect the PW link.
  • the PE2 searches the corresponding PW and AC status table according to the PW and AC status table indexes on the BFD detection instance table.
  • PE2 checks the corresponding PW and AC status table.
  • the AC status bit in the AC sends a Hello packet containing the cascading path fault diagnosis word to PE1 according to the AC status bit DOWN.
  • Step 205 After the PE1 receives the Hello packet containing the cascading path fault diagnosis word, the PE1 searches for the corresponding PW and AC state table according to the indexes of the PW and the AC state table on the BFD detection instance table, and the PW is included in the PW.
  • the status bit is set to DOWN.
  • Step 206 Detecting the near-end AC link by using the ETHOAM detection technology, and the PE1 searches for the corresponding FW and AC status table according to the indexes of the PW and the AC status table on the ETHOAM detection instance table, and PE1 checks the corresponding PW and AC.
  • the PW status bit in the status table sends a CCM message with the RDI flag bit 1 or a CCM message containing the TLV to CE1 according to the PW status bit.
  • Step 207 After receiving the CCM message with the RDI flag bit 1 or the CCM message containing the TLV, the CE1 knows that the link is faulty. If there is a backup link, the CE1 quickly switches to the backup link. Otherwise, the link is reported to be faulty.
  • more flag bits may be stored in the PW and the AC status table, for example, the PW is down (PW down for expire) due to the BFD detection timeout, and the PW receives the fault message of the peer end. It is set to down (PW down for expire), PW is set to down (PW down for AC, ie, REMOTE AC DOWN), and AC is down (AC down for expire;), AC reception due to ETHOAM detection timeout.
  • PW down for RDI Set to down (AC down for RDI) to the fault message at the opposite end, The AC is set to down (AC down for PW) due to the adjacent PW failure. This allows you to locate the location where the fault occurred by viewing the PW and AC status tables.
  • ETHOAM and BFD detect link recovery they are responsible for changing the status of the detected AC or PW link in the PW and AC status tables to U? .
  • the embodiment of the present invention also provides a method for detecting fault interworking in an Ethernet PWE3 network.
  • the ETHOAM for monitoring AC and the BFD for monitoring PW are directly established on the PE device through the correspondence between AC and PW.
  • the corresponding relationship is used to implement fault detection interworking in the PWE3 network.
  • the PW link fails, for example, PE1 does not receive the Hello packet sent by the PE2, or receives the Hello message sent by the PE2.
  • the fault detection result is advertised to the AC link.
  • the method of advertising the fault detection result to the AC link includes the following steps.
  • Step 301 Add an index of the BFD detection instance table and a PW status bit in the ETHOAM detection instance table of the AC link.
  • Step 302 Add an index of the ETHOAM detection instance table and an AC status bit to the BFD detection instance table of the PW link.
  • Step 303 The BFD detection technology is used to detect the link PW.
  • the PE1 and the PE2 respectively search for the corresponding index according to the ETHOAM detection instance table in the BFD detection instance table.
  • the ETHOAM detection instance table sets the PW status bit in the ETHOAM detection instance table to DOWN.
  • Step 304 The ETHOAM detection technology is used to detect the AC link, and PE1 and PE2 view the PW status bits in the corresponding ETHOAM detection instance table, and send the CCM report with the RDI flag bit 1 to CE1 and CE2 according to the PW status bit. Text or CCM message containing TLV.
  • Step 305 CE1 and CE2 receive a CCM message with the RDI flag bit of 1 or After the CCM message of the TLV, the link is faulty. If there is a backup link, CE1 and CE2 quickly switch to the backup link. Otherwise, the link is faulty.
  • a remote AC link (a link between PE2 and CE2) fails, that is, when The PE2 does not receive the CCM packet from the CE2, or the CCM packet with the RDI flag is 1 or the CCM packet with the TLV sent by the CE2.
  • the fault detection result is advertised to the near-end AC link.
  • the method of (the link between PE1 and CE1) includes the following specific steps.
  • Step 401 Add an index of the BFD detection instance table and a PW status bit in the ETHOAM detection instance table of the AC link.
  • Step 402 Add an index of the ETHOAM detection instance table and an AC status bit to the BFD detection instance table of the PW link.
  • Step 403 The ETHOAM detection technology is used to detect the remote AC link.
  • the PE2 searches for the corresponding BFD detection instance table in the ETHOAM detection instance table.
  • the BFD test instance table sets the AC status bit in the BFD test instance table to DOWN.
  • Step 404 The BFD detection technology is used to detect the link PW.
  • the PE2 checks the AC status bit in the corresponding BFD detection instance table, and sends a Hello packet containing the cascaded path fault diagnosis word to the PE1 according to the AC status bit.
  • Step 405 After the PE1 receives the Hello packet containing the cascading path fault diagnosis word, the PE1 searches for the corresponding ETHOAM detection instance table according to the index of the ETHOAM detection instance table in the BFD detection instance table, and the ETHOAM detection instance table is The PW status bit is set to DOWN.
  • Step 406 The ETHOAM detection technology is used to detect the near-end AC link, and the PE1 checks the PW status bit in the corresponding ETHOAM detection instance table, according to the PW status bit.
  • a CCM message with a RDI flag of 1 or a CCM message containing a TLV is sent to CE1.
  • Step 407 After receiving the CCM message with the DI flag bit 1 or the CCM message containing the TLV, the CE1 knows that the link is faulty. If there is a backup link, the CE1 quickly switches to the backup link. Otherwise, the link is reported to be faulty.
  • an embodiment of the present invention further provides a fault detection result interworking device, where the apparatus includes an initialization module, a link detection module, a status bit setting module, a status bit viewing module, and a detection message sending module.
  • the initialization module is configured to establish a state association of two adjacent links, and associate the state associations with the detection instance tables of the two links respectively;
  • the link detection module is configured to detect the status of the two links, and send the detected link status to the status bit setting module.
  • the status bit setting module is configured to set the status of the link according to the correspondence between the detection instance table and the status on the link;
  • the status bit viewing module is configured to view the status of the link according to the status association of the two adjacent links, and send the status of the link to the detection.
  • the detection packet sending module is configured to set a detection packet according to the state of the link, and send a detection packet to the adjacent link of the link.
  • the initialization module may be an association module for the state table, configured to establish a state association table of linear indexes on the common data area of two adjacent links, and respectively set the state association table Corresponding to the detection instance table of the two links; at this time, the status bit setting module is configured to: after receiving the link state sent by the link detection module, when one of the links is found to be faulty, according to the link The detection instance table on the search finds the corresponding state association table, and sets the status bit of the link in the state association table to the fault state; The module is configured to view the status of the link according to a state association table on the common data area of the two adjacent links before sending the detection packet to the adjacent link of the link, and the link is The status is sent to the detection message sending module; the detecting message sending module is configured to: after receiving the status of the link sent by the status bit viewing module, if the status bit of the link is a fault status, the setting includes the fault flag bit.
  • the detection packet is sent to the adjacent link of the link and
  • the initialization module may be a link monitoring module, configured to add an index of the detection instance table of the adjacent link and a status bit of the adjacent link in the detection instance table of the link;
  • the bit setting module is configured to: after receiving the link state sent by the link detection module, if one link is found to be faulty, search for the detection instance table of the adjacent link according to the detection instance table of the link, and The status bit of the link in the detection instance table of the adjacent link is set to a fault state; the status bit viewing module is configured to view the detection instance of the adjacent link before sending the detection packet to the adjacent link of the link.
  • the status of the link in the table, and the status of the link is sent to the detection message sending module; the message sending module is configured to: after receiving the status bit to view the status of the link sent by the module, if the link When the status bit is in the fault state, the detection packet containing the fault flag is set, and the detection packet containing the fault flag is sent to the adjacent link.
  • Embodiments of the present invention also propose a network comprising at least two links, the two adjacent links, the state association of the two links being set at the nodes at the junction of the two links.

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

Abstract

La présente invention a trait à un procédé, un dispositif et un réseau permettant de communiquer réciproquement des résultats de détection de pannes, lequel procédé inclut les étapes consistant à : établir une relation d'état entre deux liaisons adjacentes et associer la relation d'état à la liste d'instances de détection des liaisons correspondantes (101), lorsque l'une des liaisons est en panne (102), définir l'état de la liaison en fonction de la relation d'état (103) ; et rechercher l'état de la liaison dans ladite relation d'état, définir le paquet de données de détection en fonction de l'état de la liaison et envoyer le paquet de données de détection à la liaison adjacente de la liaison (104). Le mode de réalisation de l'invention résout efficacement le problème d'intercommunication des résultats de détection de pannes.
PCT/CN2007/001267 2006-08-02 2007-04-18 Procédé, appareil et réseau permettant de communiquer réciproquement des résultats de détection de pannes WO2008017223A1 (fr)

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CNB2006101040694A CN100446476C (zh) 2006-08-02 2006-08-02 一种网络故障检测结果互通的方法和装置

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