CN100403704C - Method for detecting fault by near-end node - Google Patents
Method for detecting fault by near-end node Download PDFInfo
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Abstract
The present invention relates to a method for detecting the failure of a near end node, which comprises the following steps: A. a far end node of a label switching path (LSP) transmits a detecting message to the near end node; B. the near end node of the label switching path analyzes the detecting message to obtain the detecting type and the detecting frequency of the detecting message; C. the near end node uses the detecting type and the detecting frequency to carry out operation management and maintain OAM detection. The method realizes dynamically adjust the information of the near end node of the LSP at the far end node, and avoids service interruption in the adjusting process. Simultaneously, the arrangement of LSP detection can be controlled by the far end node, and the detecting configuration is simplified.
Description
Technical field
The present invention relates to fault detection technique field in the compunication, relate in particular to a kind of method of detecting fault by near-end node.
Background technology
MPLS (Multiprotocol Label Switch, multiprotocol label switching) is the synthesis of a kind of exchange and route, it merges network layer route and link layer exchange, its advantage is to improve routing performance price ratio, improve the route retractility, and make user network import and implement on the new network business greater flexibility is arranged.But the control plane of current MPLS technical network still is connectionless, for making traditional IP (Internet Protocol, Internet protocol) datum plane of network from " do not have connect " to " connection is arranged " transition, introduced ATM (Asynchronous Transfer Mode, asynchronous transfer mode) thought of fixed length label exchange realizes the carrier-class next generation network.
The flexibility of IP route technology that the MPLS technology is seamlessly integrated and the simple and direct property of two layers of exchange, introducing QoS (Quality of Service, service quality), TE (Traffic Engineering, traffic engineering), VPN (Virtual Private Network, virtual private networks), OAM (OperationAdministration and Maintenance, Operations Management and maintenance) etc. after the technology, MPLS becomes the key technology of the integration of three networks gradually, and has increased the means of some management and operation for IP network.
MPLS OAM technology is based on the MPLS technology, and service such as switches for the MPLS network provides detection of connectivity, fault delivery and the protection of LSP (LabelSwitch Path, label switched path).
In the detection of connectivity technology, detection messages has two types: CV (ConnectivityVerification, detection of connectivity), FFD (Fast Failure Detection, defects detection fast).
In CV detects, the LSP distant-end node sent a CV message every 1 second, if near-end node was not received message within 3 seconds, then think LOCVD (Loss of ConnectivityVerification Defect, the loss of connectivity defective), if near-end node was received at least 5 correct CV messages within 3 seconds, then think ED (hypervelocity defective, Excess Defect) takes place.The CV message carries (the Trail Termination Source Identifier of LSP unique identifier TTSI in the network simultaneously, the sourcesink connection identifier), can detect the situation that occurs wrong connection (Misbranching) in the network, if near-end node was only received the message that carries wrong TTSI within 3 seconds, then think and mismatch (MisMatch) occurs in the network, if near-end node was not only received the message that carries correct TTSI but also receive the message that carries wrong TTSI within 3 seconds, then think to occur wrong the merging in the network.
FFD finishes same function with CV; detect with respect to the CV message; the detection messages transmission frequency of FFD is higher, and can finish failure of connectivity faster and detect, thus timely trigger protection switching operation; reduce time of service interruption; the transmission frequency of FFD message has only clearly been stipulated 6 kinds (10ms, 20ms,, 50ms, 100ms, 200ms, 500ms) in standard; but maximum can be supported 255 kinds of transmission frequency, and unspecified transmission frequency is reserved.Simultaneously the FFD message also carries TTSI, and is can detected defect type consistent with CV.
When the message detection is broken down, can be by transmitting BDI (the reverse preliminary warning notice of Backward Defect Indication) message, be backward channel of detected LSP binding, the message that near-end node is received by analysis, after detecting LSP generation defective, the BDI message that will carry defect information by backward channel sends to distant-end node, thereby makes distant-end node in time know defect state.The backward channel of carrying BDI may be following three types: a dedicated reverse LSP, with the corresponding unique reverse LSP of forward direction LSP; Article one, share reverse LSP.Many the shared reverse LSP of forward direction LSP, all LSP return the BDI message all by this reverse LSP; Non-MPLS return path.
As shown in Figure 1: determine the detection of connectivity pattern of LSP jointly by the near-end node (R5) of tested LSP and distant-end node (R1),
Set up a LSP_A between R1-＞R6-＞R5, as detected LSP
Set up a LSP_B between R5-＞R4-＞R3-＞R2-＞R1, as reverse LSP
Before opening the OAM detection, need dispose the OAM detected parameters respectively at near-end node (R5) and the distant-end node (R1) of LSP_A, comprising:
Detection messages type: CV or FFD;
Detection messages frequency: 10ms, 20ms, 50ms, 100ms, 200ms, 500ms;
TTSI: by LSR-ID (the Label Switch Router-Identification of the distant-end node of LSP, the LSR sign) reaches the Tunnel-ID (Tunnel-Identification that is bound with tested LSP, ID of trace route path) forms, as the whole network unique identification of LSP and be used for detecting the TTSI defective;
LSP goes into label: be respectively the outgoing label of LSP_A at hop node second from the bottom (R6), and at the label of going into of near-end node (R5), be used at near-end node sign LSP;
Reverse LSP: be used for when near-end node detects defective, transmitting the BDI message and give distant-end node.
After configuration effort is finished, order open detection by craft respectively at distant-end node and the near-end node of LSP.
When carrying out MPLS OAM detection, need be configured near-end node and distant-end node respectively, therefore following mistake can appear:
The TTSI of near-end node and distant-end node, LSP go into label or oppositely the LSP configuration is different, causes professional obstructed;
The type of detection of near-end node and distant-end node or detection frequency configuration are different, cause detecting unusual;
Backward channel can only be LSP, can't realize non-MPLS return path, and removes or transmit when obstructed as reverse LSP, and the BDI message can't arrive distant-end node, and distant-end node can't be known defective;
The near-end node and the distant-end node twice that need manual configuration LSP simultaneously when the MPLS OAM that carries out many LSP detects, need carry out a large amount of configuration efforts, also can therefore introduce the human configuration mistake;
Near-end node and distant-end node detect to be opened asynchronous the time, causes detecting unusual, and prior to the distant-end node open detection, or distant-end node stops to detect prior to near-end node, detects LOCVD mistakenly as near-end node;
When needs are revised the type of connectivity testing message and frequency, must stop OAM(Operation Administration Maintenance) respectively, remodify after the configuration of two ends again open detection respectively, use inconvenience at distant-end node and near-end node.
Summary of the invention
Main purpose of the present invention is to provide a kind of method of near-end node information processing, thereby realizes that distant-end node sends detection messages, and near-end node is by obtaining the type of detection in the message and detecting frequency, the detection of opening near-end node.
A kind of method of detecting fault by near-end node comprises:
The distant-end node of A, tag transform path LSP sends detection messages to near-end node;
The near-end node of B, described tag transform path is resolved described detection messages, obtains the type of detection of this detection messages and detects frequency;
C, described near-end node use described type of detection and described detection frequency to open Operations Management and safeguard that OAM detects.
Described type of detection comprises: detection of connectivity CV or quick defects detection FFD.
Obtain the type of detection of this detection messages and detect frequency and also comprise step before:
Described near-end node obtains the unique identification of LSP in the described detection messages, thereby sets up described near-end node OAM and described LSP binding relationship.
Described unique identification comprises: the sourcesink sign TTSI that goes into label or LSP of LSP.
Set up described near-end node OAM and described LSP binding relationship and be by described index of going into the OAM of label and described near-end node and set up mapping; Or mapping set up in the index of the OAM by described TTSI and described near-end node.
After described step C, also comprise step:
Described distant-end node sends the preliminary warning notice message FDI of expansion to described near-end node;
Described near-end node obtains this FDI, stops OAM and detects.
After described step C, also comprise step:
Described distant-end node sends the preliminary warning notice message FDI of expansion to described near-end node;
Described near-end node obtains this FDI, stop OAM and detect, and transmission stops response message to described distant-end node;
When described distant-end node receives described response message, send the message that has new type of detection and detect frequency;
Described near-end node uses described new type of detection and detects frequency and restart described near-end node OAM detection.
Also comprise step after the described step C:
When near-end node detects defective, this near-end node is resolved the detection messages that far-end sends, obtain the address information of distant-end node, thereby described near-end node obtains the backward channel that sends Backward Defect Indication BDI message, announces described distant-end node and defective occurs.
The address information of obtaining distant-end node is by obtaining the sign ID of the label translation router LSR of distant-end node in the switching path TTSI sign, determining the address information of distant-end node according to described ID.
After described step C, also comprise step:
When described LSP is removed, stop to have the OAM detection of the near-end node of binding relationship with this LSP.
The present invention can bring following effect:
Label is gone in the forwarding of TTSI, the LSP that is comprised in the transmission message of near-end node and distant-end node, make near-end node bind mutually with this LSP, thereby the TTSI, the LSP that realize near-end node and distant-end node go into the consistent of label, simultaneously, near-end node obtains the type of detection of distant-end node or detects frequency from the message that distant-end node sends, and use the type of detection of distant-end node and detect the detection of frequency unlatching near-end, thereby the detection frequency and the type of detection of near-end node and distant-end node are consistent, guarantee to detect normal operation;
Near-end node obtains the sign ID of the label translation router LSR of distant-end node in the switching path TTSI sign from detection messages, obtain the address information of distant-end node according to described ID, thereby identify the passage of BDI message, thereby make distant-end node in time know defective; Distant-end node is adjusted the type of detection and the sense cycle of LSP near-end node dynamically, avoids being in course of adjustment service disconnection occurring;
Near-end node is simplified the near-end node of LSP and the configuration of distant-end node by obtaining the information of upgrading near-end node in the message that obtains the distant-end node transmission, avoids the mistake of introducing because of human configuration.
Description of drawings
Fig. 1 is the detection of connectivity ideograph of LSP in the prior art.
Fig. 2 is the flow chart of detecting fault by near-end node method among the present invention.
Embodiment
Core of the present invention is: in MPLS OAM detects, obtain the message information of distant-end node transmission for the near-end node of LSP, by resolving this message information; Carry out corresponding operating according to the information near-end node that is resolved to, thereby finish operation near-end node.
Describe the present invention in detail below in conjunction with accompanying drawing:
The concrete handling process of the method for the invention is as shown in Figure 2:
The distant-end node of steps A, LSP sends detection messages to near-end node.
Described detection messages is that distant-end node passes through first message that this LSP arrives near-end node.
The near-end node of step B, described tag transform path is resolved described detection messages, obtains the type of detection of this detection messages and detects frequency;
Described type of detection comprises: detection of connectivity CV or quick defects detection FFD.
Step C, described near-end node use described type of detection and described detection frequency to open Operations Management and safeguard that OAM detects.
Also comprise step in the type of detection of obtaining this detection messages with before detecting frequency:
Obtain the unique identification of LSP in step D, the detection messages of near-end node, thereby the detection messages that distant-end node sends arrives near-end node by same LSP, realize that the OAM detection of near-end node is bound mutually with this LSP according to the distant-end node transmission.
The unique identification of LSP comprises: the forwarding in the detection messages go into label or TTSI.
The label of transmitting of going into is non-0 empty label.
Go into label when empty when what transmit, the forwarding by obtaining LSP go into OAM and the described LSP binding relationship that label is set up near-end node; Otherwise, set up the OAM of near-end node and the binding relationship of described LSP according to the TTSI in the detection messages, thereby be implemented in the unimpeded of business.
The OAM of near-end node and described LSP binding are to set up mapping relations by the index of transmitting label or TTSI and described near-end node OAM.
Described message information is first detection messages that described distant-end node sends.
After step C, also comprise step e among the present invention, as shown in Figure 4:
Step e, near-end node obtain the FDI message of the expansion of distant-end node transmission, judge whether the OAM detection of near-end node needs to stop, when determining that the OAM that need stop near-end node detecting, and stops near-end node OAM and detects; Otherwise, continue to carry out corresponding operation.
Be provided with in the FDI message of described expansion and stop the inspection sign, this sign is used to identify near-end node and is used to identify near-end node and whether stops OAM and detect, when stopping inspection, this is designated when stopping near-end node OAM and detecting sign, the OAM that stops near-end node detecting, be designated non-when stopping to indicate when this stops inspection, do not stop the OAM of near-end node, carry out normal business operation.
Above-mentioned stop the OAM that the inspection sign can use " 1 " sign need stop near-end node and detect, " 0 " expression does not need to stop the detection of near-end node OAM, and this stops examining sign and can also not represent to stop to detect and do not stop to detect with other mode.
Near-end node receives the FDI of distant-end node expanded function, is designated the OAM detection that need stop near-end node when confirming to stop examining, and near-end node stops OAM and detects; Otherwise, carry out the flow process of coming out normally, thereby stopping of detecting of near-end node OAM just can be controlled by the management plane of distant-end node fully.
After step e, also comprise step F 1 among the present invention, F2, F3 as shown in Figure 5:
Step F 1, when near-end node stops OAM and detects, send and stop examining response message to distant-end node;
Step F 2, distant-end node obtain the described response message that stops examining, and send to have the new detection frequency and the detection messages of type of detection;
Step F 3, near-end node obtain described detection messages, and the OAM that restarts near-end node with new detection frequency and detection detects.
After step C, also comprise step G among the present invention:
Step G, near-end node obtain the backward channel BDI of OAM.
Near-end node needs to send the BDI message to distant-end node to backward channel, therefore the address that need obtain distant-end node after detecting defective.
The LSR ID that preceding 16 bytes of TTSI are distant-end node (label conversion Route Distinguisher) determines the address of distant-end node by this LSR ID.
Near-end node obtains LSR ID among the TTSI in the detection messages according to the detection messages that distant-end node sends, and obtains the distant-end node address information, thereby finds the optimal path of transmitting the BDI message, realizes the purpose to distant-end node announcement defective.
When the LSP that has a binding relationship with near-end node is removed, should stops near-end node OAM and detect.
The beneficial effect that the application of the invention brings is:
Label is gone in the forwarding of TTSI, the LSP that is comprised in the transmission message of near-end node and distant-end node, make near-end node bind mutually with this LSP, thereby the TTSI, the LSP that realize near-end node and distant-end node go into the consistent of label, simultaneously, near-end node obtains the type of detection of distant-end node or detects frequency from the message that distant-end node sends, and use the type of detection of distant-end node and detect the detection of frequency unlatching near-end, thereby the detection frequency and the type of detection of near-end node and distant-end node are consistent, guarantee to detect normal operation;
Near-end node obtains the sign ID of the label translation router LSR of distant-end node in the switching path TTSI sign from detection messages, obtain the address information of distant-end node according to described ID, thereby identify the passage of BDI message, thereby make distant-end node in time know defective; Distant-end node is adjusted the type of detection and the sense cycle of LSP near-end node dynamically, avoids being in course of adjustment service disconnection occurring;
Near-end node is simplified the near-end node of LSP and the configuration of distant-end node by obtaining the information of upgrading near-end node in the message that obtains the distant-end node transmission, avoids the mistake of introducing because of human configuration.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (11)
1. the method for a detecting fault by near-end node is characterized in that, comprising:
The distant-end node of A, tag transform path LSP sends detection messages to near-end node;
The near-end node of B, described tag transform path is resolved described detection messages, obtains the type of detection of this detection messages and detects frequency;
C, described near-end node use described type of detection and described detection frequency to open Operations Management and safeguard that OAM detects.
2. method according to claim 1 is characterized in that, described type of detection comprises: detection of connectivity CV or quick defects detection FFD.
3. method according to claim 1 is characterized in that, obtains the type of detection of this detection messages and detect frequency also to comprise step before:
Described near-end node obtains the unique identification of LSP in the described detection messages, thereby sets up described near-end node OAM and described LSP binding relationship.
4. method according to claim 3 is characterized in that, described unique identification comprises: the sourcesink sign TTSI that goes into label or LSP of LSP.
5. according to the method for claim described 4, it is characterized in that, set up described near-end node OAM and described LSP binding relationship and be by described index of going into the OAM of label and described near-end node and set up mapping; Or mapping set up in the index of the OAM by described TTSI and described near-end node.
6. method according to claim 1 is characterized in that, also comprises step after described step C:
Described distant-end node sends the preliminary warning notice message FDI of expansion to described near-end node;
Described near-end node obtains this FDI, stops OAM and detects.
7. method according to claim 6 is characterized in that, is provided with among the FDI of described expansion to stop the inspection sign, and this sign is used to identify near-end node and whether stops the OAM detection.
8. method according to claim 7 is characterized in that, also comprises step after near-end node stops the OAM detection:
Near-end node sends and stops examining response message to distant-end node;
Distant-end node obtains the described response message that stops examining, and sends to have the new detection frequency and the detection messages of type of detection;
Near-end node obtains described the have new detection frequency and the detection messages of type of detection, and the OAM that restarts near-end node with new detection frequency and new type of detection detects.
9. method according to claim 1 is characterized in that, also comprises step after the described step C:
When near-end node detects defective, this near-end node is resolved the detection messages that distant-end node sends, obtain the address information of distant-end node, thereby described near-end node obtains the backward channel that sends Backward Defect Indication BDI message, announces described distant-end node and defective occurs.
10. method according to claim 9, it is characterized in that, the address information of obtaining distant-end node is by obtaining the sign ID of the label translation router LSR of distant-end node in the switching path TTSI sign, determining the address information of distant-end node according to described ID.
11. according to any described method of claim 1 to 10, it is characterized in that, after described step B, also comprise step:
When described LSP is removed, stop to have the OAM detection of the near-end node of binding relationship with this LSP.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101330442B (en) * | 2007-06-20 | 2010-12-08 | 中兴通讯股份有限公司 | Method for transferring defect indication information based on sharing reverse path |
| CN101197731B (en) * | 2007-12-12 | 2012-02-01 | 华为技术有限公司 | Path fault detection method, system and device |
| CN102752128B (en) * | 2012-04-19 | 2015-07-08 | 杭州华三通信技术有限公司 | Multi-protocol label switching (MPLS) traffic engineering (TE) tunnel fault detection method and device thereof |
| CN103888295B (en) * | 2014-03-07 | 2017-03-15 | 烽火通信科技股份有限公司 | The method and system of LSP quick detections are realized in PTN/IPRAN webmasters based on loopback |
| CN105703967B (en) * | 2014-11-27 | 2020-02-14 | 中兴通讯股份有限公司 | Method and device for detecting connectivity of label switched path |
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| CN1250263A (en) * | 1998-09-30 | 2000-04-12 | 朗迅科技公司 | Continuity and integrity method of automatic monitoring communication trunk line |
| JP2003174469A (en) * | 2001-12-06 | 2003-06-20 | Nef:Kk | Label switch router |
| CN1514585A (en) * | 2002-10-24 | 2004-07-21 | Method used for detecting conncetion failure, system and network entity | |
| US20050147050A1 (en) * | 2002-04-29 | 2005-07-07 | Joachim Klink | Method for examining the connectivity of links in mpls networks |
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| CN1250263A (en) * | 1998-09-30 | 2000-04-12 | 朗迅科技公司 | Continuity and integrity method of automatic monitoring communication trunk line |
| JP2003174469A (en) * | 2001-12-06 | 2003-06-20 | Nef:Kk | Label switch router |
| US20050147050A1 (en) * | 2002-04-29 | 2005-07-07 | Joachim Klink | Method for examining the connectivity of links in mpls networks |
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