CN100459516C - Automatic identifying method for near-end CV mode of multi-protocol tag exchange - Google Patents
Automatic identifying method for near-end CV mode of multi-protocol tag exchange Download PDFInfo
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- CN100459516C CN100459516C CNB2005100341543A CN200510034154A CN100459516C CN 100459516 C CN100459516 C CN 100459516C CN B2005100341543 A CNB2005100341543 A CN B2005100341543A CN 200510034154 A CN200510034154 A CN 200510034154A CN 100459516 C CN100459516 C CN 100459516C
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Abstract
A method for automatically identifying near end CV mode of multiprotocol countermark interchange includes setting CV mode at far end of countermark interchange path by management plane, setting track mode at near end of countermark interchange path by management plane, tracking and holding consistency to far end CV mode by near end of countermark interchange path according to CV mode message.
Description
Technical field
The present invention relates to the multiple label switching technology in a kind of optical-fiber network, in particular, in the operation of multiprotocol label switching with safeguard the automatic identifying method of near-end connectivity checking (CV) pattern in (MPLS OAM).
Background technology
Multiprotocol label switching (Multi-Protocol Label Switching, hereinafter to be referred as MPLS) technology, introduced the thought of ATM fixed length label exchange, made the datum plane of traditional IP network to " connection is arranged " transition, not realize the next generation network of " carrier class " from " have and connect "; At present, the control plane of MPLS network still is connectionless, after introducing service quality QoS (Quality of Service), traffic engineering TE (Traffic Engineering), virtual privately owned (special use) network VPN (VirtualPrivate Network), moving and safeguard OAM technology such as (Operations and Maintenance), MPLS becomes the key technology of the integration of three networks gradually.
ITU-T has defined MPLS OAM technology, and it comprises that detection of connectivity, fault delivery method and protection switch etc.See also Y.1710, Y.1711, Y.1712, Y.1713 and Y.1720, for the detection of connectivity technology, ITU-T has defined three kinds of patterns:
a)CV：
Label switching path LSP (Label Switched Path, hereinafter to be referred as: LSP) far-end is the CV message every detection messages of transmission in 1 second; If near-end was not received this message within 3 seconds, then think loss of connectivity.What the CV message carried is network unique identifier TTSI (TrailTermination Source Identifier, source end trace termination (function) sign), can detect the situation that whether occurs wrong connection (Misbranching) in the network.
b)FFD-CV：
FFD-CV finishes same function with CV, and with respect to the CV pattern, the detection messages of FFD-CV is that FFD-CV message transmission frequency is higher, can finish failure of connectivity faster and detect, thereby timely trigger protection switching operation reduces time of service interruption.The transmission frequency of FFD-CV has only clearly been stipulated 6 kinds in Y.1711,10ms, and 20ms, 50ms, 100ms, 200ms, 500ms, but maximum can be supported 255 kinds of transmission frequency, unspecified transmission frequency is reserved.The FFD-CV message also carries TTSI.
c)FEC-CV：
CV, FFD-CV pattern require LSP at first to build up, but many times, the situation that LSP has only the part path to build up can occur, and at this moment, need to use the FEC-CV pattern.Under this pattern, not according to TTSI sign LSP, but according to FEC sign LSP.
At every LSP, can only from CV, FFD-CV and three kinds of patterns of FEC-CV, select wherein a kind ofly, can not mix use.
Hereinafter, will be with CV pattern general reference CV, FFD-CV, these three kinds of patterns of FEC-CV, CV message general reference CV message, FFD-CV message, these three kinds of patterns of FEC-CV message.
Decompose according to general function, network is made up of datum plane, control plane, management plane, and datum plane is called transmission plane or user plane sometimes again.Control plane is mainly finished and is called out control, connects control, and supports these to connect protocol processes such as required route, signaling, for example neighbours' discovery/link management, signaling, route and protection etc. in the routed domain.Management plane is finished the maintenance function of datum plane, control plane and whole system, it is responsible for all interplanar coordination and cooperations, can be configured and manage end-to-end the connection, be that of control plane replenishes, and comprises Element management system and network management system.Have the M.3010 management function of institute's standard, i.e. performance management, fault management, configuration management, accounting management and safety management function, in addition, it also comprises built-in network planning tool.Datum plane simultaneously, also will transmit some controls and network management information with in-band method for the user provides from end-to-end two-way or unidirectional information transfer service.
The function boundary of management layer and control plane is moved gradually, and the function of control plane is powerful gradually.Traditional SDH network, management layer is powerful, and the configuration of teleservice is almost all finished by management layer, has control plane hardly.Introduce automatic optical switching network ASON (AutomaticSwitched Optical Networks) afterwards, call out the function of control, connection control and finished by control plane, management plane only need tell the attributes such as source, place and bandwidth of the required connection of control plane to get final product.
Be the detection of connectivity pattern of determining LSP by management plane in the prior art, its step as shown in Figure 1: by R1-〉R6-set up a LSP_A between the R5; Then management plane disposes the CV pattern of LSP_A near-end and far-end respectively on R1 and R5.If but near-end is different with the far-end configuration, can cause professional obstructed; When particularly R1 is managed by different webmasters with R2, may be the equipment of different operators as R1 and R2, the configuration of near-end and far-end is different can often to be taken place.
And it is apparent that this kind pattern need be in near-end and the far-end configuration twice of LSP, the configuration effort amount is bigger.
Therefore, there is defective in prior art, and awaits improving and development.
Summary of the invention
The object of the present invention is to provide a kind of automatic identifying method of near-end CV mode of multiprotocol label switching, after far-end has determined the CV pattern, need not to dispose simultaneously, to reduce the workload of configuration, evasive action risk at far-end and near-end; Simultaneously, allow management plane configuration CV pattern.
Technical scheme of the present invention is as follows:
A kind of automatic identifying method of near-end connectivity checking CV pattern of multiprotocol label switching is used for the near-end of label switched path and the consistent process of far-end connectivity checking CV pattern, and it may further comprise the steps at least:
A) management plane is provided with connectivity checking CV pattern at the far-end of described label switched path;
B) management plane is arranged on the near-end of described label switched path for following the tracks of the pattern of far-end connectivity checking CV pattern;
C) near-end of described label switched path is followed the tracks of the connectivity checking CV mode message of far-end, and maintenance and far-end connectivity checking CV pattern is consistent.
Described automatic identifying method, wherein, described step C) it is to receive the MPLS OAM message that far-end transmits by datum plane by near-end that the described CV mode message in is followed the tracks of, to determine far-end CV pattern.
Described automatic identifying method, wherein, described step C) described far-end CV mode message is followed the tracks of in is by carrying the CV pattern that the CV pattern is determined far-end in the signaling message of near-end by control plane.
Described automatic identifying method, wherein, described signaling message is the PATH based on RSVP RSVP.
Described automatic identifying method, wherein, described signaling message is the label request message of label distribution protocol LDP.
Described method, wherein, the tracing process in the described step c) also comprises:
C1) message of circular wait multiprotocol label switching is transmitted the CV message reception indication of processing subsystem;
C2) when from data flow, receiving the CV message, CV pattern information is wherein discerned and judged whether identical with current mode record;
C3) as inequality, change the present mode of near-end record into receive CV pattern, get back to described step c1);
C4) the CV pattern as predetermined number is identical, and the CV mode state machine processing module of control near-end selects the state machine of corresponding described CV mode record to handle.
Described method, wherein, it is at step c1) set in advance a CV packet accouter before, and
At described step c3) mid-described CV packet accouter is 1; And
Described step c4) identical with current mode record in as the CV pattern information, then described CV packet accouter is added 1 operation, value until this CV packet accouter surpasses the predetermined times condition, the near-end of this label switched path is set at the CV pattern of described CV mode record correspondence.
Described method, wherein, the default value of described CV mode record is specially CV.
The automatic identifying method of the near-end CV mode of a kind of multiprotocol label switching provided by the present invention, owing to adopt after the CV pattern of LSP far-end is set, carry out mode tracking at near-end,, avoided the inconsistent situation of CV pattern configurations of LSP near-end and far-end to adopt the CV pattern of far-end; And allow management plane in the near-end configuration CV of LSP pattern, with existing scheme compatibility; Can change the CV pattern of near-end by the CV pattern of adjusting LSP at far-end dynamically, avoid in the mode adjustment process, service disconnection occurring.
Description of drawings
Fig. 1 is the schematic network structure of the detection of connectivity of prior art;
Fig. 2 is the schematic network structure of automatic identifying method of the near-end CV mode of multiprotocol label switching of the present invention;
Fig. 3 is the structural representation of the message handling system of the inventive method;
Fig. 4 is the process chart of the CV state machine of the inventive method;
Fig. 5 is that the LSP near-end CV mode of the inventive method is followed the tracks of the process chart of processing module;
Fig. 6 is the schematic network structure that the CV mode tracking of the inventive method is handled.
Embodiment
Below will be by preferred embodiment of the present invention is described in detail.
The automatic identifying method of the near-end CV mode of multiprotocol label switching of the present invention, as shown in Figures 2 and 3, its message handling system comprises management plane and two levels of datum plane at least, described management plane is finished the detection of connectivity pattern configurations of LSP, receive the warning information of datum plane, and feed back to the user.Described datum plane is finished the MPLS message and is transmitted processing and MPLS OAM﹠amp; P handles; The MPLS message is transmitted processing subsystem identification OAM message, gives MPLS OAM﹠amp with the OAM message; The P processing subsystem simultaneously, is finished the protection switching action of LSP.Described MPLS OAM﹠amp; The P processing subsystem is responsible for CV mode tracking, the processing of CV state machine and protection and is switched processing etc., and it comprises CV mode tracking processing module respectively, and processing module is switched in a CV state machine processing module and a protection.Described datum plane is according to the data flow in the described MPLS message forwarding processing subsystem; by described CV mode tracking processing module the CV pattern is controlled; described CV state machine processing module is according to described MPLSCV message; connectivity state information is sent to described protection switch processing module, switch processing module by described protection and protection is switched control.
In the automatic identifying method of the present invention, therefore the CV pattern, can only be provided with CV mode tracking processing module at the LSP near-end at the LSP remote setting, specify LSP use a kind of CV pattern wherein by described management plane, this moment, described CV mode tracking processing module was left intact; Allow management plane change CV pattern.
Described message handling system is tracking mode (Tracking) at near-end in case by management plane appointment CV pattern, this CV mode tracking processing module receives the MPLS message and transmits the CV message that processing subsystem passes over, if in continuous a period of time, the identical CV message number of receiving is greater than a value, be assumed to be MODE_TRANSIT, think that then the CV pattern of LSP is changed.At this moment, control CV state machine processing module is carried out state machine and is switched, and the CV mode switch of near-end is become corresponding pattern.
Whether its handling process after beginning, is at first judged the setting of management layer force to have specified a kind of CV pattern still to be provided with for tracing mode as shown in Figure 4; If not forcing to specify the CV pattern, be set to tracing mode, then the default mode recording setting is CV; And be provided with a CV packet accouter; Circular wait MPLS message is transmitted the CV message reception indication of processing subsystem then, when from data flow, receiving the CV message, CV pattern information is wherein discerned and judged whether identical with current pattern, as inequality, change the CV mode record of near-end into receive CV pattern, simultaneously the CV packet accouter is changed to 1, gets back to above-mentioned circular wait MPLS message and transmit the state that the CV message of processing subsystem receives indication.If the CV pattern information in the CV message of receiving is identical with current CV pattern, then described CV packet accouter is added 1 operation, value until this CV packet accouter surpasses the predetermined times condition, think that then the CV pattern of LSP remote setting is the pattern of CV message correspondence, control the CV mode state machine processing module of near-end this moment, select CV, FFD_CV or FEC_CV state machine to carry out respective handling according to present CV pattern decision.
The type of the received so far CV message of cvMode representative record as shown in Figure 4, i.e. CV mode record, value is: among CV, FFD-CV, the FEC-CV one; The number of the cvMode type message that cvCounter representative record is received so far, i.e. CV packet accouter; The MODE_TRANSIT representative triggers the condition of CV pattern change---receive the number of certain CV message continuously, i.e. a predetermined times.
In above-mentioned steps, the trigger condition of described CV pattern change, can increase some constraints, such as in certain time interval, the CV message number of receiving continuously is greater than predetermined times condition MODE_TRANSIT, the CV pattern that then shows far-end is stable can be used for following the tracks of, so the CV pattern of near-end is set to identical with far-end; When change takes place described CV pattern, can provide warning information to described management plane---CV pattern change alarm; If in a period of time, the CV pattern of receiving is frequently changed, and then triggers loss of connectivity defective alarm dLOCV (Loss ofConnectivity Verification defect is hereinafter to be referred as dLOCV); If the mode tracking function is used in the management plane decision, so, need the dLOCV alarm of shielding CV state machine processing module.
In above-mentioned steps, the trigger condition of described CV pattern change can also be in the given time, whether the CV pattern in the CV message of being received is same type judges that the CV pattern of then upgrading near-end in this way is the type, otherwise, reclocking.When in this given time, when the CV pattern of the CV message of being received is same type, show that the CV pattern of far-end is determined; On the contrary, unstable or wrong if the CV pattern of far-end in variable condition the time, shows far-end, thereby near-end restarts timing, receives the CV pattern message of same type in the time at predetermined length.
Described CV state machine processing module is treated to the LSP far-end, as shown in Figure 5, according to the configuration of management plane, sends corresponding CV message according to given frequency.Y.1711 and ITU-T protocol specification Y.1713 concrete processing sees also ITU-T, and prior art is existing open, repeats no more.
Described CV state machine processing module is treated to the LSP near-end, is compatible prior art scheme, allows management plane to specify the CV pattern of LSP, so, then when needs use the prior art scheme, directly specifies the CV pattern of near-end to get final product by management plane.When using the inventive method, follow the tracks of set management plane of the pattern of far-end, during beginning, being defaulted as is the processing mode of CV; Afterwards, if receive the pattern change indication of CV mode tracking processing module, then according to the concrete processing mode of the decision of the cvModeOper in the indication.
If CV state machine processing module detects loss of connectivity in the inventive method, then trigger protection switches that module is carried out fault delivery, protection such as switches at processing.Detailed processing sees also ITU-TY.1720, and prior art is existing open, no longer describes.
The automatic identifying method of the near-end CV mode of multiprotocol label switching of the present invention because the CV pattern of LSP far-end only need be set, carries out mode tracking at near-end, has avoided the inconsistent situation of CV pattern configurations of LSP near-end and far-end; And allow management plane in the near-end configuration CV of LSP pattern, carried out compatibility with the scheme of prior art; Can only adjust the CV pattern of LSP dynamically, avoid in the mode adjustment process, service disconnection occurring at far-end.
Must explanation be, described message handling system can also comprise control plane, the inventive method is under the situation that control plane participates in, specify the CV pattern by management plane at the LSP far-end, can the CV pattern information be delivered to the LSP near-end by the signaling message of control plane, as shown in Figure 6, for example, when using RSVP-TE to set up the tunnel, when the LSP far-end carries out the label distribution request, carry the CV pattern information in Path message, the LSP near-end is according to CV information in the Path message of receiving, which kind of CV processing mode decision selects; The perhaps CV pattern information of in the label request Label of LDP Request message, carrying far-end.
Should be understood that above-mentioned explanation at specific embodiment of the present invention is comparatively concrete and detailed, can not therefore limit scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims; Those of ordinary skills can change or replace according to technical scheme of the present invention and the foregoing description, and all these changes or replacement all should belong to scope of patent protection of the present invention.
Claims (8)
1, a kind of automatic identifying method of near-end connectivity checking CV pattern of multiprotocol label switching is used for the near-end of label switched path and the consistent process of far-end connectivity checking CV pattern, and it may further comprise the steps at least:
A) management plane is provided with connectivity checking CV pattern at the far-end of described label switched path;
B) management plane is arranged on the near-end of described label switched path for following the tracks of the pattern of far-end connectivity checking CV pattern;
C) near-end of described label switched path is followed the tracks of the connectivity checking CV mode message of far-end, and maintenance and far-end connectivity checking CV pattern is consistent.
2, automatic identifying method according to claim 1 is characterized in that, described step C) in described far-end CV mode message is followed the tracks of be specially:
Receive the MPLS OAM message that far-end transmits by datum plane by near-end, to determine far-end CV pattern.
3, automatic identifying method according to claim 1 is characterized in that, described step C) in described far-end CV mode message is followed the tracks of be specially:
Be by carrying the CV pattern that the CV pattern is determined far-end in the signaling message of near-end by control plane.
4, automatic identifying method according to claim 3 is characterized in that, described signaling message is the PATH based on RSVP RSVP.
5, automatic identifying method according to claim 3 is characterized in that, described signaling message is the label request message of label distribution protocol LDP.
6, method according to claim 1 and 2 is characterized in that, the tracing process in the described step c) also comprises:
C1) message of circular wait multiprotocol label switching is transmitted the CV message reception indication of processing subsystem;
C2) when from data flow, receiving the CV message, CV pattern information is wherein discerned and judged whether identical with current mode record;
C3) as inequality, change the present mode of near-end record into receive CV pattern, get back to described step c1);
C4) the CV pattern as predetermined number is identical, and the CV mode state machine processing module of control near-end selects the state machine of corresponding described CV mode record to handle.
7, method according to claim 6 is characterized in that, described method sets in advance a CV packet accouter, and
At described step c3) mid-described CV packet accouter is 1; And
Described step c4) identical with current mode record in as the CV pattern information, then described CV packet accouter is added 1 operation, value until this CV packet accouter surpasses the predetermined times condition, the near-end of this label switched path is set at the CV pattern of described CV mode record correspondence.
8, method according to claim 9 is characterized in that, the default value of described CV mode record is specially CV.
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| CN1551571A (en) * | 2003-04-15 | 2004-12-01 | ���Ͽع�����˾ | Central internet protocol/multi protocol label switching verification in communication network management environment |
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Patent Citations (4)
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| 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 | |
| CN1551571A (en) * | 2003-04-15 | 2004-12-01 | ���Ͽع�����˾ | Central internet protocol/multi protocol label switching verification in communication network management environment |
| CN1455568A (en) * | 2003-05-29 | 2003-11-12 | 北京港湾网络有限公司 | Label synchronous control method concurrently operating multi-MPLS protocol in MPLS group network |
Non-Patent Citations (2)
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| 多协议标记技术(MPLS)及应用. 程建兴.广东农工商职业技术学院学报，第18卷第4期. 2002 |
| 多协议标记技术(MPLS)及应用. 程建兴.广东农工商职业技术学院学报，第18卷第4期. 2002 * |
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