CN1859431A - Method for realizing two-way marked exchange path - Google Patents
Method for realizing two-way marked exchange path Download PDFInfo
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Abstract
The present invention discloses bidirectional labeling exchange route implementation method. Said method establishes bidirectional labeling exchange route through distributing identifier bidirectional LSP-ID, decomposing down transmitting user configured information, and configuring each MPLS node etc steps. Said configuration includes port number configuration, label configuration, band width configuration, and service type configuration, wherein said service type and band width configuration needing respectively configuring in LSP two directions. Said invention provided bidirectional LSP implementation method realize using one bidirectional LSP to substitute two independent direction LSP for bearing bidirectional business, at the same time effectively saving management cost. Furthermore the present invention also provides bidirectional LSP performance statistics, warning processing and protective treatment method, to solve bidirectional LSP specific application.
Description
Technical field
The present invention relates to the implementation method of a kind of two-way marked exchange path (bidirectional LSP), the situation of communication field telecommunication service operator when providing the lsp tunnel of multi-protocols agreement label switched (MPLS) professional is provided.
Background technology
The MPLS technology gains universal acceptance in the data communication field at present.The MPLS functional layer is between data link layer and the network layer, can satisfy professional to demands such as quick forwarding, service quality (QoS), protection and traffic engineerings.Along with the popularization of MPLS technology on optical switching network, MPLS switching technology (GMPLS) technology of light, data general-purpose has also produced.This has further expanded MPLS The Application of Technology field.
The most significant technical characteristic of MPLS has provided the LSP function.LSP can provide annexation end to end, and concrete business can be concerned about to have passed through what path between LSP start node and the end node, and LSP is the basis that MPLS provides functions such as QoS, protection and traffic engineering.
The data channel end to end that LSP provides is for the MPLS technology provides plurality of advantages.The definition of LSP is unidirectional, begins by intermediate node from start node, arrives end node at last, finishes the one-way transmission of Frame.Yet under the overwhelming majority's situation, be two-way by the LSP loaded service, two-way services must be had a try 1 and be transmitted among two LSP.Two-way services are carried on unidirectional LSP and have been caused many managerial inconvenience, have doubled management workload.Therefore, for the needs of managing, introduced the notion of bidirectional LSP.
At present, defined bidirectional LSP from technical standpoint in the system of GMPLS, the problem that has occurred when having focused on the use of bidirectional LSP in signaling protocol.But bidirectional LSP in actual applications, for the problem of its Operation and Maintenance aspect, comprises how creating of bidirectional LSP, and the problem of the aspects such as performance statistics, alarm and protection in the two-way process that relates to, and also do not have clear and definite implementation method.
Summary of the invention
The objective of the invention is successfully to set up bidirectional LSP by this method, thereby effectively reduce the management cost of carrying two-way services by LSP for bidirectional LSP provides a kind of implementation method.
A plurality of device nodes connect and compose a network by the bottom link, and these transmission nodes are used for distributing or set up LSP and connect.LSP connects provides service channel end to end, and the business of finishing from the start node to the end node transmits.
A MPLS system must comprise control aspect and data plane.The control aspect is responsible for receiving the configuration information and the various information that report webmaster from webmaster.Do not considering under the signaling capability prerequisite that the control aspect is the media between webmaster and the data plane.Data plane receives the management of control aspect, directly is responsible for the function of practical business.
For realizing described purpose, the present invention finishes the establishment of bidirectional LSP by following steps:
(1) user provides and sets up the configuration information that bidirectional LSP needs, and bidirectional LSP is set up in application;
(2) after MPLS control aspect receives that the user sets up the application of bidirectional LSP, distribute an identifier bidirectional LSP-ID, be used for identifying user and ask the bidirectional LSP set up, the corresponding unique identifier bidirectional LSP-ID of bidirectional LSP;
(3) MPLS control aspect is decomposed user configuration information, and the configuration interface by webmaster is issued on each node of LSP successively;
(4) from start node, through intermediate node, arrive end node at last, each MPLS node is configured according to the configuring request of receiving, and feedback configuration failure or success; If there is the LSP node of configuration failure, optional the selecting of then control aspect issues configuration or cancellation configuration this time again;
Described configuration comprises the configuration of port numbers, the configuration of label, the configuration of bandwidth, the configuration of COS;
The configuration of port numbers comprises the configuration of port numbers and downstream end slogan upstream; The configuration of label comprises the label that upstream enters the mouth, upstream exports label, enter the mouth label and export the configuration of label downstream downstream;
The configuration of COS and the configuration of bandwidth, the both direction that needs to distinguish bidirectional LSP disposes respectively;
(5) after all node configuration successes of LSP, return to control aspect successful information, this bidirectional LSP is promptly successfully set up, and can use to finish different business for the user and transmit purpose.
Configuration information described in the above-mentioned steps (1), comprise start node, end node, LSP by way of intermediate contact, the LSP port numbers and the MPLS label that use during by each node, and the COS of LSP business and bandwidth information.
After bidirectional LSP was created, in order to guarantee the fail safe of network, important business generally needed configuration backup LSP, realized professional protection.Because bidirectional LSP is an indivisible unit, direction is all no longer distinguished in the configuration of the protection of bidirectional LSP, protection relation, and two-way working LSP is by two-way standby LSP protection.When needing protection, the other bidirectional LSP that can create or select to have set up is as backup LSP, and the relevant protection attribute of appointment.
Bidirectional LSP provides in equipment after the business, reports the various performance situations of transmitting and receiving service by network management interface.The statistics of bidirectional LSP and the statistics of unidirectional LSP are different, comprise the statistics to the transmitting and receiving service situation of both direction.Because the unidirectional characteristic in tunnel, use unidirectional " forwarding " parameter just passable during the through performance of the bag of statistics unidirectional tunnel, but two-way forwarding performance must be distinguished direction and add up respectively; The forwarding of the bag from start node to the end node direction is called " transmitting downstream ", and the forwarding of the bag from the end node to the start node is called " forwarded upstream ".The concrete parameter of performance statistics is identical with unidirectional statistics.
Bidirectional LSP provides in equipment after the business, reports various alarm statuses by network management interface.The alarm source of LSP comprises MPLS bottom fault and this layer fault.For unidirectional LSP, occur under the alarm situation at MPLS bottom or this layer, by signaling and message, the fault two ends produce " alarm signal indication " and " indication of remote alarm signal " respectively.The alarm of bidirectional LSP provides the alarming processing of bidirectional LSP and reports, and alarm parameter is identical with unidirectional LSP, but alarm parameter need be identified in the direction in the bidirectional LSP.Because any LSP warning information in the bidirectional LSP all is reflected on the bidirectional LSP, if two unidirectional LSP in the bidirectional LSP interrupt simultaneously, actually at the two ends of bidirectional LSP will produce two alarm signals simultaneously, i.e. " alarm signal indication " and " indication of remote alarm signal ".
Utilize the implementation method of the bidirectional LSP that the present invention proposes, can successfully set up bidirectional LSP, realized that technically a bidirectional LSP substitutes two independently unidirectional LSP with the carrying two-way services, has effectively saved management cost simultaneously.In addition, the present invention has also further proposed performance statistics, alarming processing and the protection processing method of bidirectional LSP, has solved the concrete application problem of bidirectional LSP.
Description of drawings
Fig. 1 is the conceptual schematic view of bidirectional LSP.
Fig. 2 is the establishment configuration parameter example of bidirectional LSP.
Fig. 3 is the performance parameter of bidirectional LSP.
Fig. 4 is the alarm parameter of bidirectional LSP.
Embodiment
Here provide a kind of typical case of bidirectional LSP to use---the application in the multi-service transport platform (MSTP) of embedded MPLS.The MSTP of embedded MPLS provides Ethernet Private Line/private network business, and Ethernet Private Line/private network business features promptly has the amphicheirality.As the business that provides, necessarily have very strong manageability, manageability in addition on the MSTP product, therefore easy management becomes a key takeaway in this field so that reliable and stable business to be provided fast.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical solution of the present invention:
Hardware components
The MPLS node device of a plurality of embedded synchronous digital hierarchys (SDH) connects and composes a network by the SDH link.Other has between network management system equipment and SDH network element and establishes a communications link, and network management system equipment is used for management and transmits network element, and the network management system functions of the equipments realize on a PC.
Software section
Mainly finish on the MSTP software of embedded MPLS and can be divided into control aspect and data plane driving two large divisions.The control aspect is responsible for receiving the configuration of webmaster, and finishes issuing of configuration.In addition, the control aspect receives the operational order of webmaster, complete operation maintenance function; Data plane drive software part is operated the order of adaptive control aspect then to hardware register, finally finish the function on upper strata.
Below the detailed process explanation is done in the establishment of bidirectional LSP and the enforcement of maintenance:
(1) SDH that sets up on the webmaster between the node connects, normally the cascaded series of VCG, for example virtual cascade group; The LSP of MPLS carries out on these SDH connection basis;
(2) user provides and sets up the configuration information that bidirectional LSP needs, and bidirectional LSP is set up in application; Configuration information comprise start node, end node, LSP by way of intermediate contact, the LSP port numbers and the MPLS label that use during by each node, and the COS of LSP business and bandwidth information;
(3) after MPLS control aspect receives that the user sets up the application of bidirectional LSP, distribute an identifier bidirectional LSP-ID, be used for the bidirectional LSP of the required foundation of identifying user, the corresponding unique identifier bidirectional LSP-ID of bidirectional LSP;
(4) MPLS control aspect is decomposed user configuration information, and parameter is seen Fig. 2, and the configuration interface by webmaster is issued on each node of LSP successively;
(5) from start node, through intermediate node, arrive end node at last, each MPLS node is configured according to the configuring request of receiving, and feedback configuration failure or success; If there is the LSP node of configuration failure, then controls level selection and issue configuration again;
Described configuration comprises the configuration of port numbers, the configuration of label, the configuration of bandwidth, the configuration of COS;
The configuration of port numbers comprises the configuration of port numbers and downstream end slogan upstream; The configuration of label comprises the label that upstream enters the mouth, upstream exports label, enter the mouth label and export the configuration of label downstream downstream;
The configuration of COS and the configuration of bandwidth, the both direction that needs to distinguish bidirectional LSP disposes respectively;
(6) after all node configuration successes of LSP, return to control aspect successful information, this bidirectional LSP is promptly successfully set up, and can use to finish different business for the user and transmit purpose.
After bidirectional LSP was created and finished, the user can be as required by the protection of network management configuration LSP on this basis, and alternative configuration comprises 1+1 protection and protection in 1: 1.1+1 protection is meant can bearer service on the protection path, and protection in 1: 1 is meant on the protection path not bearer service, and details see also ITU-T YD 1720 standards.Create successful bidirectional LSP, have identical start node and destination node, but by selecting backup LSP in the bidirectional LSP in different paths, the parameter of configuration protection relation comprises time of delay and recovery time.
The user is creating configuration service on the successful bidirectional LSP, and these business can be Ethernet service and ethernet vlan business.
Provide in the process of business at bidirectional LSP, the user needs the transmitting-receiving performance of monitoring traffic at LSP, according to the theory of SDH webmaster, regularly reports required performance, and performance parameter is seen Fig. 3, and the computational methods of performance are as follows:
The byte number that forwarding byte number downstream=be responsible for is transmitted from port upstream to the LSP of port downstream
The bag number that forwarding bag number downstream=be responsible for is transmitted from port upstream to the LSP of port downstream
The bag number that discarded packets number downstream=be responsible for abandons from port upstream to the LSP of port downstream
The byte number that upstream forwarding byte number=be responsible for is transmitted from port downstream to the LSP of port upstream
The bag number that upstream forwarding bag number=be responsible for is transmitted from port downstream to the LSP of port upstream
The bag number that upstream discarded packets number=be responsible for abandons from port downstream to the LSP of port upstream
According to the theory of SDH webmaster, the test point of bidirectional LSP alarm parameter is bidirectional LSP-ID, and fault parameter is seen Fig. 4, comprises upstream connectivity check failure, the failure of connectivity check downstream, upstream SDH layer fault and SDH layer fault downstream.When the MPLS of LSP layer or bottom detect fault and take place, alarm produce and the process that reports as follows:
(1) the SDH layer as MPLS service layer breaks down, SDH layer report and alarm signal; Perhaps this layer of MPLS breaks down, and for example, unidirectional LSP connectivity takes place detects failure (LOCV);
(2) the downstream end points of fault point produces fault warning on bidirectional LSP, for example LOCV alarm;
(3) the downstream end points sends reverse fault indication (BDI) signal to start node;
(4) start node of bidirectional LSP produces the BDI alarm.
Bidirectional LSP is in operation, can be because of breaking down or webmaster operation causes protecting the generation of switching, and it is machine-processed as follows that protection is switched:
The node protective switching of going bail for takes place in (1) break down alarm or BDI alarm of working LSP, and the business of switching is received and dispatched on the backup LSP simultaneously, and switching action is carried out at the transmitting-receiving of whole bidirectional LSP;
(2) webmaster can Artificial Control be switched generation, carries out Forced Switch and Manual Switch; Forced Switch has the priority that is higher than disturbance switching, and the priority of Manual Switch is lower than disturbance switching;
(3) after the fault recovery, business is switched recovery if desired, and then operating path is switched back in Ye Wu transmitting-receiving simultaneously; Switch recovery and can be configured to recoverable or irrevocable formula, recoverable needs provide the configuration of recovery time.
Claims (10)
1, a kind of implementation method of two-way marked exchange path is characterized in that, finishes the establishment of two-way marked exchange path (bidirectional LSP) by following steps:
(1) user provides and sets up the configuration information that bidirectional LSP needs, and bidirectional LSP is set up in application;
(2) after MPLS control aspect receives that the user sets up the application of bidirectional LSP, distribute an identifier bidirectional LSP-ID, be used for identifying user and ask the bidirectional LSP set up;
(3) MPLS control aspect is decomposed user configuration information, and the configuration interface by webmaster is issued on each node of LSP successively;
(4) from start node, through intermediate node, arrive end node at last, each MPLS node is configured according to the configuring request of receiving, and feedback configuration failure or success; If there is the LSP node of configuration failure, optional the selecting of then control aspect issues configuration or cancellation configuration this time again;
Described configuration comprises the configuration of port numbers, the configuration of label, the configuration of bandwidth, the configuration of COS;
The configuration of port numbers comprises the configuration of port numbers and downstream end slogan upstream; The configuration of label comprises the label that upstream enters the mouth, upstream exports label, enter the mouth label and export the configuration of label downstream downstream;
The configuration of COS and the configuration of bandwidth, the both direction that needs to distinguish bidirectional LSP disposes respectively;
(5) after all node configuration successes of LSP, return to control aspect successful information, this bidirectional LSP is promptly successfully set up, and can use to finish different business for the user and transmit purpose.
2, implementation method according to claim 1, it is characterized in that, configuration information described in the step 1 comprise start node, end node, LSP by way of intermediate contact, the LSP port numbers and multi-protocols agreement label switched (MPLS) label that use during by each node, and the COS of LSP business and bandwidth information.
3, implementation method according to claim 1 and 2 is characterized in that, after bidirectional LSP was created, two-way working LSP was by two-way standby LSP protection, and protected mode can be a 1+1 protection, perhaps protection in 1: 1.
4, implementation method according to claim 1 and 2 is characterized in that, the bidirectional LSP of being set up provides in equipment after the business, reports the various performance situations of transmitting and receiving service by network management interface;
Forwarding performance is distinguished the upstream and downstream direction and is added up respectively, and the forwarding of the bag from start node to the end node direction is called " transmitting downstream ", and the forwarding of the bag from the end node to the start node is called " forwarded upstream ";
The concrete parameter of performance statistics and the computational methods of performance are as follows:
The byte number that forwarding byte number downstream=be responsible for is transmitted from port upstream to the LSP of port downstream
The bag number that forwarding bag number downstream=be responsible for is transmitted from port upstream to the LSP of port downstream
The bag number that discarded packets number downstream=be responsible for abandons from port upstream to the LSP of port downstream
The byte number that upstream forwarding byte number=be responsible for is transmitted from port downstream to the LSP of port upstream
The bag number that upstream forwarding bag number=be responsible for is transmitted from port downstream to the LSP of port upstream
The bag number that upstream discarded packets number=be responsible for abandons from port downstream to the LSP of port upstream.
5, implementation method according to claim 3 is characterized in that, the bidirectional LSP of being set up provides in equipment after the business, reports the various performance situations of transmitting and receiving service by network management interface;
Forwarding performance is distinguished the upstream and downstream direction and is added up respectively, and the forwarding of the bag from start node to the end node direction is called " transmitting downstream ", and the forwarding of the bag from the end node to the start node is called " forwarded upstream ";
The concrete parameter of performance statistics and the computational methods of performance are as follows:
The byte number that forwarding byte number downstream=be responsible for is transmitted from port upstream to the LSP of port downstream
The bag number that forwarding bag number downstream=be responsible for is transmitted from port upstream to the LSP of port downstream
The bag number that discarded packets number downstream=be responsible for abandons from port upstream to the LSP of port downstream
The byte number that upstream forwarding byte number=be responsible for is transmitted from port downstream to the LSP of port upstream
The bag number that upstream forwarding bag number=be responsible for is transmitted from port downstream to the LSP of port upstream
The bag number that upstream discarded packets number=be responsible for abandons from port downstream to the LSP of port upstream.
6, implementation method according to claim 1 and 2 is characterized in that, the bidirectional LSP of being set up provides in equipment after the business, when the MPLS of LSP layer or bottom detect fault and take place, alarm produce and the process that reports as follows:
(1) the downstream end points of fault point produces fault warning on bidirectional LSP;
(2) the downstream end points sends the reverse fault index signal to start node;
(3) start node of bidirectional LSP produces reverse fault indication alarm;
The test point of bidirectional LSP alarm parameter is bidirectional LSP-ID, and fault parameter comprises upstream connectivity check failure, the failure of connectivity check downstream, upstream SDH layer fault and SDH layer fault downstream.
7, implementation method according to claim 5 is characterized in that, the bidirectional LSP of being set up provides in equipment after the business, when the MPLS of LSP layer or bottom detect fault and take place, alarm produce and the process that reports as follows:
(1) the downstream end points of fault point produces fault warning on bidirectional LSP;
(2) the downstream end points sends the reverse fault index signal to start node;
(3) start node of bidirectional LSP produces reverse fault indication alarm;
The test point of bidirectional LSP alarm parameter is bidirectional LSP-ID, and fault parameter comprises upstream connectivity check failure, the failure of connectivity check downstream, upstream SDH layer fault and SDH layer fault downstream.
8, implementation method according to claim 6 is characterized in that, the bidirectional LSP of being set up is in operation, and is breaking down or webmaster action need protection when switching, and switches according to following method protection:
The node protective switching of going bail for takes place in (1) break down alarm or BDI alarm of working LSP, and the business of switching is received and dispatched on the backup LSP simultaneously, and switching action is carried out at the transmitting-receiving of whole bidirectional LSP;
(2) webmaster can Artificial Control be switched generation, carries out Forced Switch and Manual Switch; Forced Switch has the priority that is higher than disturbance switching, and the priority of Manual Switch is lower than disturbance switching;
(3) after the fault recovery, business is switched recovery if desired, and then operating path is switched back in Ye Wu transmitting-receiving simultaneously; Switch recovery and can be configured to recoverable or irrevocable formula, recoverable needs provide the configuration of recovery time.
9, implementation method according to claim 1 and 2 is characterized in that, the configuration of port numbers described in the step 4 and the configuration of label, and for start node, upstream port numbers and gateway label all are 0; For end node, port numbers downstream and gateway label all are 0.
10, implementation method according to claim 8 is characterized in that, the configuration of port numbers described in the step 4 and the configuration of label, and for start node, upstream port numbers and gateway label all are 0; For end node, port numbers downstream and gateway label all are 0.
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| WO2008113258A1 (en) * | 2007-03-20 | 2008-09-25 | Huawei Technologies Co., Ltd. | Communication system, device, route switching method and label issued state notifying method |
| CN101141330B (en) * | 2007-10-23 | 2010-06-16 | 华为技术有限公司 | Method, system and equipment to establish BFD detection for LSP tunnel |
| WO2010127570A1 (en) * | 2009-05-08 | 2010-11-11 | 华为技术有限公司 | Method, device and system for establishing bidirectional point-to-multipoint label switched path |
| CN101404613B (en) * | 2008-11-20 | 2011-04-20 | 华为技术有限公司 | Data protection method and device |
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| WO2008113258A1 (en) * | 2007-03-20 | 2008-09-25 | Huawei Technologies Co., Ltd. | Communication system, device, route switching method and label issued state notifying method |
| US8121121B2 (en) | 2007-03-20 | 2012-02-21 | Huawei Technologies Co., Ltd. | Communication system, device, method for handing over a route and method for notifying a state of advertising a label |
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| CN101141330B (en) * | 2007-10-23 | 2010-06-16 | 华为技术有限公司 | Method, system and equipment to establish BFD detection for LSP tunnel |
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| WO2010127570A1 (en) * | 2009-05-08 | 2010-11-11 | 华为技术有限公司 | Method, device and system for establishing bidirectional point-to-multipoint label switched path |
| US8824451B2 (en) | 2010-02-26 | 2014-09-02 | Zte Corporation | Method and system for establishing an associated bidirectional label-switched path |
| WO2011103759A1 (en) * | 2010-02-26 | 2011-09-01 | 中兴通讯股份有限公司 | Method for establishing associated bidirectional label switching path and system thereof |
| CN102148713A (en) * | 2011-05-11 | 2011-08-10 | 烽火通信科技股份有限公司 | Linear protection switching method applicable to large-capacity PTN (packet transport network) device |
| CN102148713B (en) * | 2011-05-11 | 2013-12-11 | 烽火通信科技股份有限公司 | Linear protection switching method applicable to large-capacity PTN (packet transport network) device |
| WO2013091545A1 (en) * | 2011-12-21 | 2013-06-27 | 华为技术有限公司 | Path display method, device and communication system during service deployment |
| CN102611569A (en) * | 2011-12-21 | 2012-07-25 | 华为技术有限公司 | Path display method and device in service deployment and communication system |
| CN102611569B (en) * | 2011-12-21 | 2014-12-03 | 华为技术有限公司 | Path display method and device in service deployment and communication system |
| CN104219146A (en) * | 2013-06-04 | 2014-12-17 | 上海贝尔股份有限公司 | Method and device for label configuration in access network based on ANCP (access network control protocol) |
| CN104219146B (en) * | 2013-06-04 | 2018-09-04 | 上海诺基亚贝尔股份有限公司 | Method and apparatus based on ANCP label allocations in access net |
| WO2015035570A1 (en) * | 2013-09-11 | 2015-03-19 | Telefonaktiebolaget L M Ericsson (Publ) | Inter-chassis peer and method used therein |
| US10164863B2 (en) | 2013-09-11 | 2018-12-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Inter-chassis peer and method used therein |
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