CN101610181A - Realize method, the Apparatus and system of fault detect - Google Patents

Realize method, the Apparatus and system of fault detect Download PDF

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Publication number
CN101610181A
CN101610181A CNA2009100882824A CN200910088282A CN101610181A CN 101610181 A CN101610181 A CN 101610181A CN A2009100882824 A CNA2009100882824 A CN A2009100882824A CN 200910088282 A CN200910088282 A CN 200910088282A CN 101610181 A CN101610181 A CN 101610181A
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vccv
message
ping
ping message
fault
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CN101610181B (en
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刘长宝
赵思乐
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2009100882824A priority Critical patent/CN101610181B/en
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Priority to PCT/CN2010/075080 priority patent/WO2011006428A1/en
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H04L43/103—Active monitoring, e.g. heartbeat, ping or trace-route with adaptive polling, i.e. dynamically adapting the polling rate
    • 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
    • H04L41/40—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using virtualisation of network functions or resources, e.g. SDN or NFV entities

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A kind of method that realizes fault detect comprises: receive virtual circuit connectivity and detect the VCCV-PING message, carry the transmitting terminal state information in the described VCCV-PING message; Resolve described VCCV-PING message, judge that according to described transmitting terminal state information whether transmitting terminal breaks down, and when transmitting terminal breaks down, is provided with failure identification in this locality.The embodiment of the invention also provides a kind of Apparatus and system of realizing fault detect.Because the VCCV-PING message is the basic OAM demand of PWE3, therefore, adopt the VCCV-PING message of expansion to realize fault detect, can support the whole network to realize that network failure detects, and realize complete O﹠M mapping, reduced system's implementation complexity and development and maintenance cost.

Description

Method, device and system for realizing fault detection
Technical Field
The invention relates to the technical field of communication, in particular to a fault detection implementation scheme.
Background
In order to improve the operation and Maintenance performance of the network and ensure the reliability of the network, when a network side fails, a network side failure notification needs to be sent to a CE (Customer Edge) through a network technology of an AC (Access Circuit) side, so that the CEs on both sides of OAM Mapping (operation and Maintenance Mapping; OAM, Operations and Maintenance) sense the network side failure.
The AC side network technology for implementing the transmission of the network side fault may be ATM (asynchronous transfer Mode) OAM, E-LMI (Ethernet-Local management interface), or the like. Specifically, network side fault transmission can be realized by using signaling such as VCCV-BFD (Virtual Circuit Connectivity Detection-Bidirectional Forwarding Detection; Virtual Circuit Connectivity Detection; Bidirectional Forwarding Detection), T-LDP (T-label distribution Protocol), and the like.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
communication equipment which does not support VCCV-BFD or T-LDP exists in the existing network, and the equipment cannot realize the transmission of network side faults by using VCCV-BFD signaling or T-LDP signaling. Therefore, no implementation scheme supporting the network-wide implementation of network-side fault delivery exists in the prior art.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for realizing fault detection, thereby supporting the whole network to realize network side fault transmission and realizing complete operation and maintenance mapping.
The purpose of the invention is realized by the following technical scheme:
a method of implementing fault detection, comprising:
receiving a virtual circuit connectivity detection (VCCV-PING) message, wherein the VCCV-PING message carries state information of a transmitting end;
and analyzing the VCCV-PING message, judging whether the sending end has a fault according to the state information of the sending end, and setting a fault identifier locally when the sending end has the fault.
An apparatus for implementing fault detection, comprising:
the device comprises a message receiving module, a virtual circuit connectivity detection (VCCV-PING) module and a virtual circuit connectivity detection (VCCV-PING) module, wherein the VCCV-PING message carries state information of a transmitting end;
and the state detection module is used for analyzing the VCCV-PING message received by the message receiving module, judging whether the sending end has a fault according to the sending end state information, and setting a fault identifier locally when the sending end has the fault.
A system for implementing fault detection, the system comprising a source operator equipment PE and a sink PE,
the source end PE and the host end PE are connected through a pseudo wire PW;
the source PE is used for sending a request message to the sink PE through the PW, and the request message carries state information of the source;
the host PE is used for receiving and analyzing the request message, judging whether the source end fails according to the state information of the source end, and if the source end fails, setting a failure identifier locally.
According to the technical scheme provided by the embodiment of the invention, the fault detection is realized by adopting the extended VCCV-PING message, the network fault detection can be realized in the whole network, and the system realization complexity and the development and maintenance cost are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a PWE3 network structure provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a processing procedure provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The VCCV-PING message is a basic operation and maintenance requirement of PWE3(Pseudo Wire Emulation Edge to Edge, end-to-end Pseudo Wire Emulation), and communication devices in the PWE3 network all support the VCCV-PING message. The embodiment of the invention realizes the network side fault detection by expanding the VCCV-PING message, thereby realizing the operation and maintenance mapping.
The implementation scheme for realizing fault detection through the expanded VCCV-PING message in the embodiment of the invention specifically comprises the following steps:
receiving a VCCV-PING message, wherein the VCCV-PING message carries state information of a sending end; and analyzing the VCCV-PING message, judging whether the sending end has a fault according to the state information of the sending end, and setting a fault identifier locally when the sending end has the fault.
The sending end state information specifically refers to AC network state information of the sending end side. In addition, the VCCV-PING message also carries PW (Pseudo Wire) and AC identification information of the transmitting end, so that the receiving end can identify the transmitting end according to the PW and AC identification information.
In the method for detecting a network failure provided in the embodiment of the present invention, when a network failure at a transmitting end is detected, setting a failure identifier locally specifically means setting a failure identifier on a local AC, so as to notify a local CE of the network failure. If the network failure at the transmitting end is not detected, the canceling of the failure flag set locally specifically means canceling the failure flag set on the local AC, so as to stop notifying the local CE of the failure.
Further, in the fault detection method provided by the embodiment of the present invention, the VCCV-PING message may be sent manually or automatically. When a sending end automatically sends a VCCV-PING message and periodically sends the message, a receiving end needs to determine the receiving timeout time of the VCCV-PING message. The implementation mode is that the sending end carries overtime time information in the VCCV-PING message, and the receiving end determines the receiving overtime time of the VCCV-PING message consistent with the sending end according to the overtime time information carried in the VCCV-PING message after analyzing the VCCV-PING message. And when the time exceeds the receiving overtime time of the VCCV-PING message and the next VCCV-PING message is still not received, setting a fault identifier locally. In addition, the receiving end needs to determine the sending frequency of the VCCV-PING message, and the VCCV-PING message also carries the current message sending frequency information of the sending end, and the analyzing the VCCV-PING message further includes: and determining the sending frequency of the VCCV-PING message consistent with the sending end according to the current message sending frequency information of the sending end.
The timeout information may be VCCV-PING message reception timeout time set by the sending end, for example, 5ns, and the locally determined VCCV-PING message reception timeout time is the same as the VCCV-PING message reception timeout time set by the sending end. The timeout time information may also be the transmission frequency and the time interval information of the transmitting end (the time interval information refers to a multiple of the transmission frequency), and the determining the VCCV-PING message reception timeout time consistent with the transmitting end according to the timeout time is implemented by comparing the transmission frequency of the transmitting end with the local transmission frequency, comparing the time interval information of the transmitting end with the local time interval information, selecting according to a rule agreed with the transmitting end (for example, selecting a larger transmission frequency and a smaller time interval information), and multiplying the selected transmission frequency by the time interval information to obtain the VCCV-PING message reception timeout time consistent with the transmitting end.
And after the receiving overtime time of the VCCV-PING message is determined, the operation of determining the receiving overtime time of the VCCV-PING message is not repeated.
According to the embodiment of the invention, the network fault detection in the PWE3 is realized by expanding the VCCV-PING message and carrying the state information of the sending end in the message. Because the communication devices in the PWE3 network all support VCCV-PING messages, the system implementation complexity and the development and maintenance cost are reduced, and the fault detection of the whole network can be supported.
In the embodiment of the present invention, the VCCV-PING packet may be a request packet sent by a source end, or may also be a response packet returned by a sink end, and both communication parties implement fault detection through the extended VCCV-PING packet, and further implement operation and maintenance mapping, where the specific implementation manner includes:
a source end sends a request message to a sink end, wherein the request message carries state information of the source end;
the sink end receives and analyzes the request message, judges whether the source end has a fault according to the state information of the source end, if so, sets a fault identifier locally, otherwise, cancels the locally set fault identifier;
the host end sends a response message to the source end, and the response message carries the state information of the host end;
the source end receives and analyzes the response message, judges whether the sink end has a fault according to the state information of the sink end, if so, sets a fault identifier locally, otherwise, cancels the locally set fault identifier; the request message and the response message are VCCV-PING messages.
Further, in the above embodiment of the present invention, if the VCCV-PING packet (including the request packet and the response packet) is periodically transmitted, the source end and the sink end need to negotiate the consistent VCCV-PING packet transmission frequency and the VCCV-PING packet reception timeout time. The specific implementation mode is as follows:
the implementation scheme of the transmission frequency of the negotiation VCCV-PING message is as follows:
the request message sent by the source end carries message sending frequency information of the source end. And when the sink terminal analyzes the request message, determining the sending frequency of the VCCV-PING message consistent with the source terminal according to the message sending frequency information of the source terminal.
The response message sent by the destination carries the message sending frequency information of the destination. The source parsing response packet further includes: and determining the VCCV-PING message sending frequency consistent with the sink end according to the message sending frequency information of the sink end.
The determining, by the sink, the VCCV-PING packet sending frequency consistent with the source according to the packet sending frequency information of the source specifically includes: and the sink end compares the current message sending frequency of the source end with the local current message sending frequency, and selects the larger (or smaller) message sending frequency as the local VCCV-PING message sending frequency. Correspondingly, the determining, by the source end, the sending frequency of the VCCV-PING packet consistent with the sink end according to the message sending frequency information of the sink end specifically includes: the source end compares the current message sending frequency of the sink end with the local current message sending frequency, and selects the larger (or smaller) message sending frequency as the local VCCV-PING message sending frequency.
After the consistent VCCV-PING message sending frequency is determined through negotiation, the source end sends a request message according to the consistent VCCV-PING message sending frequency, the sink end sends a response message according to the consistent VCCV-PING message sending frequency, and the VCCV-PING message sending frequency is not repeatedly negotiated.
The implementation scheme of the receiving overtime time of the negotiation VCCV-PING message is as follows:
the request message sent by the source end carries the timeout information. And when the host terminal analyzes the request message, determining the receiving overtime time of the VCCV-PING message consistent with the source terminal according to the overtime information.
The response message sent by the host carries the time-out information. And when the source end analyzes the response message, determining the receiving overtime time of the VCCV-PING message consistent with the sink end according to the overtime information.
In the embodiment of the invention, the VCCV-PING message is expanded, and the expanded VCCV-PING message carries the state information of the local terminal. The source end and the sink end communicate through the extended VCCV-PING message, so that operation and maintenance mapping is realized. Because the VCCV-PING messages are the basic requirement of the PWE3 network, the communication devices in the network all support the transmission of the VCCV-PING messages. Therefore, the embodiment of the invention can realize the operation and maintenance mapping of the whole network, and reduce the complexity of system realization and the development and maintenance cost.
The following is a detailed description of specific implementations of embodiments of the present invention in a practical application.
The technical solution provided by the above embodiment of the present invention will be described in detail below by taking a specific application scenario as an example. In the PWE3 network shown in fig. 1, a PE1(Provider Edge, operator equipment) sends a VCCV-PING message to a PE2 through a PW1 established with a PE2, and a PE2 sends a VCCV-PING message to a PE1 through a PW2 established with a PE 1. Communication between the PE1 and the CE1 is performed through AC 1; communication between PE2 and CE2 is via AC 2.
In the application embodiment of the invention, the VCCV-PING message is expanded, and Status TLV (Status, state; TLV Tag Length Value, label Length content), Frequency TLV (Frequency TLV) and Interval TLV (time Interval TLV) are added in the VCCV-PING message. Wherein, Status TLV carries AC state information of the VCCV-PING message sending end side; the Frequency TLV carries the message sending Frequency of a VCCV-PING message sending end; the Interval TLV carries integer multiple information of the message sending frequency of the VCCV-PING message sending end. Assuming that PE1 and PE2 have not negotiated the message sending frequency and the message receiving timeout time, the processing procedure of implementing network fault detection and operation and maintenance mapping by periodically sending extended VCCV-PING messages is as shown in fig. 2, and the specific implementation manner may include:
201. PE1 (source end) starts a VCCV-PING message sending timer, and sends a request message to PE2 (sink end) according to local sending frequency through the VCCV-PING message sending timer control, wherein the request message is an extended VCCV-PING message;
202. PE2 receives and analyzes the request message, and acquires Status TLV, Frequency TLV and Interval TLV carried in the request message;
203. comparing the local current message sending frequency with the PE1 current message sending frequency, taking a larger value and adjusting the local message sending frequency (namely the sending frequency of the response message) to the larger value, wherein if the local current message sending frequency is the larger value, the adjustment is not needed; comparing locally set Interval information with Interval information of PE1, taking a smaller value, taking the product of the adjusted message sending frequency and the smaller Interval as local VCCV-PING message receiving overtime, starting an overtime timer, and timing according to the VCCV-PING message receiving overtime;
204. judging whether the AC1 on the PE1 side fails or not according to the acquired Status TLV (for example, Boolean function information is carried in the Status TLV or binary logic information represents state information on the AC1 side), if so, setting a fault identifier in a link monitoring protocol on the local AC2 side so as to notify the CE2 of the failure through a fault code carried by the link monitoring protocol; otherwise, canceling the fault identifier set on the link monitoring protocol at the local AC2 side, and stopping reporting the fault to the CE2 through the fault code carried by the link monitoring protocol;
205. if the timeout timer times out and the request message sent by the PE1 is still not received, a fault identifier is set in the link monitoring protocol at the local AC2 side, so as to notify the CE2 of the fault through a fault code carried by the link monitoring protocol;
206. the PE2 sends a response message to the PE1, wherein the response message is a VCCV-PING message;
207. PE1 receives and analyzes the response message, and acquires StatusTLV, frequency TLV and Interval TLV carried in the response message;
208. comparing the local message sending frequency with the message sending frequency of the PE2, taking a larger value and adjusting the local message sending frequency to the larger value; comparing locally set Interval information with Interval information of PE2, taking a smaller value, taking the product of the adjusted message sending frequency and the smaller Interval as local VCCV-PING message receiving overtime, starting an overtime timer, and timing according to the VCCV-PING message receiving overtime;
209. judging whether the AC2 on the PE2 side fails according to the acquired Status TLV, if so, setting a failure identifier in a link monitoring protocol on the local AC1 side so as to notify the CE1 of the failure through a failure code carried by the link monitoring protocol; otherwise, canceling the fault identifier set on the link monitoring protocol at the local AC1 side, and stopping reporting the fault to the CE1 through the fault code carried by the link monitoring protocol;
210. if the timeout timer times out and the request message sent by PE2 is still not received, the link monitoring protocol on the local AC1 side sets a fault identifier, so as to notify the CE1 of the fault through a fault code carried by the link monitoring protocol.
After the PE1 and the PE2 negotiate the consistent message sending frequency and the message receiving overtime, the sending frequency and the message receiving overtime are not readjusted according to the received VCCV-PING message.
All or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The embodiment of the present invention further provides a device for implementing fault detection, the structure of which is shown in fig. 3, and the specific implementation structure includes:
the message receiving module 301 is configured to receive a virtual circuit connectivity detection VCCV-PING message, where the VCCV-PING message carries sending end state information;
and the state detection module 302 is configured to analyze the VCCV-PING message received by the message receiving module 301, determine whether the sending end fails according to the sending end state information, and set a failure identifier locally when the sending end fails. In addition, when the condition information of the sending end is judged that the sending end does not have a fault, the fault mark set locally is cancelled.
If the VCCV-PING message is periodically sent, the VCCV-PING message also carries timeout information, and the state detection module 302 includes a timeout time determination submodule 3021, a timing submodule 3022, and a processing submodule 3023: the timeout time determining submodule 3021 is configured to parse the VCCV-PING message, and determine, according to the timeout time information, a VCCV-PING message reception timeout time that is consistent with the transmission end; the timing submodule 3022 is configured to start timing when the timeout time determining submodule 3021 determines the VCCV-PING message reception timeout time; the processing sub-module 3023 is configured to set a fault identifier locally if the timing time of the timing sub-module 3022 exceeds the VCCV-PING message reception timeout time and the VCCV-PING message is still not received.
The embodiment of the present invention further provides a system for implementing fault detection, where the structure of the system is shown in fig. 4, and the specific implementation structure includes a source PE401 and a sink PE 402:
the source PE401 and the sink PE402 are connected through a virtual circuit PW;
the source PE401 is configured to send a request message to the sink PE402 through the PW, where the request message carries state information of the source;
the host PE402 is used for receiving and analyzing the request message, judging whether the source end fails according to the state information of the source end, and if the source end fails, setting a failure identifier locally; in addition, if the source end fails, the locally set fault identification is cancelled.
In the system provided in the foregoing embodiment of the present invention, the destination PE402 is further configured to send a response packet to the source PE401 through the PW, where the response packet carries the state information of the destination;
the source PE401 is further configured to receive and analyze the response packet, and determine whether the sink fails according to the state information of the sink, if so, set a failure identifier locally, otherwise, cancel the failure identifier locally set; the request message and the response message are VCCV-PING messages.
The system provided by the above embodiment of the present invention further includes a source customer edge device CE403 and a sink CE 403. The source end PE401 is connected with the source end CE403 through an access circuit AC; the destination PE402 is connected with the destination CE404 through an access circuit AC; the operation of the source PE401 or the sink PE402 setting the fault identifier locally is specifically setting the fault identifier on the local AC; the operation of the source PE401 or the sink PE402 canceling the locally set fault identifier is specifically canceling the locally set fault identifier on the local AC.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A method for performing fault detection, comprising:
receiving a virtual circuit connectivity detection (VCCV-PING) message, wherein the VCCV-PING message carries state information of a transmitting end;
and analyzing the VCCV-PING message, judging whether the sending end has a fault according to the state information of the sending end, and setting a fault identifier locally when the sending end has the fault.
2. The method of claim 1, wherein if the VCCV-PING message is sent periodically, the VCCV-PING message also carries timeout information, and wherein
After the analyzing the VCCV-PING message, the method further includes: determining the receiving overtime time of the VCCV-PING message consistent with the sending end according to the overtime time information;
and when the receiving overtime time of the VCCV-PING message is determined, timing is started, and if the timing time exceeds the receiving overtime time of the VCCV-PING message and the next VCCV-PING message is still not received, a fault identifier is locally set.
3. The method of claim 2, wherein the VCCV-PING message further carries information about a current message transmission frequency of a transmitting end, and wherein the VCCV-PING message further carries information about a current message transmission frequency of the transmitting end
The analyzing the VCCV-PING message further includes:
and determining the sending frequency of the VCCV-PING message consistent with the sending end according to the current message sending frequency information of the sending end.
4. The method of claim 3, wherein the determining the VCCV-PING message transmission frequency consistent with the sender according to the current message transmission frequency information of the sender comprises:
and comparing the current message sending frequency of the sending end with the local current message sending frequency, and selecting the message sending frequency consistent with the sending end as the local VCCV-PING message sending frequency according to the preset convention of the sending end.
5. The method according to any of claims 1-4, wherein the VCCV-PING message comprises a request message or a response message, and wherein the receiving a virtual circuit connectivity check VCCV-PING message comprises:
receiving a request message sent by a source end;
or,
and receiving a response message returned by the sink terminal.
6. An apparatus for performing fault detection, comprising:
the device comprises a message receiving module, a virtual circuit connectivity detection (VCCV-PING) module and a virtual circuit connectivity detection (VCCV-PING) module, wherein the VCCV-PING message carries state information of a transmitting end;
and the state detection module is used for analyzing the VCCV-PING message received by the message receiving module, judging whether the sending end has a fault according to the sending end state information, and setting a fault identifier locally when the sending end has the fault.
7. The apparatus of claim 6, wherein the VCCV-PING message is sent periodically, and the VCCV-PING message further carries timeout information, and wherein
The state detection module comprises an overtime time determination submodule, a timing submodule and a processing submodule:
the overtime time determining submodule is used for determining the receiving overtime time of the VCCV-PING message consistent with the transmitting end according to the overtime time information after analyzing the VCCV-PING message; the timing submodule is used for starting timing when the overtime time determining submodule determines the receiving overtime time of the VCCV-PING message; and the processing submodule is used for setting a fault identifier locally if the timing time of the timing submodule exceeds the receiving overtime time of the VCCV-PING message and the VCCV-PING message is still not received.
8. A system for realizing fault detection is characterized in that the system comprises a source end operator equipment PE and a sink end PE,
the source end PE and the host end PE are connected through a pseudo wire PW;
the source PE is used for sending a request message to the sink PE through the PW, and the request message carries state information of the source;
the host PE is used for receiving and analyzing the request message, judging whether the source end fails according to the state information of the source end, and if the source end fails, setting a failure identifier locally.
9. The system of claim 8,
the destination PE is also used for sending a response message to the source PE through the PW, and the response message carries the state information of the destination;
the source end PE is also used for receiving and analyzing the response message, judging whether the sink end has a fault according to the state information of the sink end, if so, setting a fault identifier locally, and otherwise, canceling the locally set fault identifier; the request message and the response message are VCCV-PING messages.
10. The system according to claim 8 or 9, characterized in that the system further comprises a source customer edge device CE and a sink CE:
the source end PE is connected with the source end CE through an access circuit AC;
the destination PE is connected with the destination CE through an access circuit AC;
the operation of the source PE or the sink PE for locally setting the fault identifier is specifically setting the fault identifier on the local AC;
the operation of the source PE or the sink PE canceling the locally set fault identifier is specifically canceling the locally set fault identifier on the local AC.
CN2009100882824A 2009-07-13 2009-07-13 Method, device and system for realizing fault detection Expired - Fee Related CN101610181B (en)

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WO2011006428A1 (en) * 2009-07-13 2011-01-20 华为技术有限公司 Method, apparatus and sysytem for realizing failure dectection
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WO2017054532A1 (en) * 2015-09-28 2017-04-06 中兴通讯股份有限公司 Control message transmitting method and apparatus
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