CN1845502A - Multi protocol label switching connectivity checking mode arranging method - Google Patents
Multi protocol label switching connectivity checking mode arranging method Download PDFInfo
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- CN1845502A CN1845502A CN 200510034061 CN200510034061A CN1845502A CN 1845502 A CN1845502 A CN 1845502A CN 200510034061 CN200510034061 CN 200510034061 CN 200510034061 A CN200510034061 A CN 200510034061A CN 1845502 A CN1845502 A CN 1845502A
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Abstract
The connectivity check-mode negotiation method by multi-protocol label exchange comprises: initiating negotiation process once distributing CV mode configuration information for the label exchange path; sending device self CV capacity information to opposite-end device; selecting CV mode according to information sent from opposite-end; controlling the processing mode of CV state machine to start up the corresponding dynamic process mechanism. This invention can ensure same CV mode for both near and remote ends and can decrease business interruption.
Description
Technical field
What the present invention relates to is multiple label switching technology in the optical-fiber network, the machinery of consultation of connectivity checking (CV) pattern of the operation and maintenance of a kind of multiprotocol label switching in particular (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 "; The control plane of present MPLS network still uses connectionless.After introducing QoS, TE, technology such as VPN, OAM, MPLS becomes the key technology of the integration of three networks gradually.
ITU-T has defined the operation and maintenance MPLS OAM technology of multiprotocol label switching, comprises that detection of connectivity, fault delivery method and protection switch.See also Y.1710, Y.1711, Y.1712, Y.1713 and Y.1720, the detection of connectivity technology of prior art, 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 message within 3 seconds, then think loss of connectivity.The CV message carries network unique identifier TTSI, can detect the situation that 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 stipulated that clearly 6 kinds is 10ms in Y.1711,20ms, and 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-VC can not support the last two jump to eject the application of (PHP:Penultimate Hop Pop) and multipoint-to-point (MP2P:Multipoint-to-Point), 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.
For preventing to obscure, abbreviate first kind of pattern as NORM_CV.Hereinafter, CV mainly makes a general reference NORM-CV, FFD-CV, these three kinds of patterns of FEC-CV, these three kinds of CV message general reference NORM-CV messages, FFD-CV message, FEC-CV message.
Decompose according to general function, multi-protocol label switching network is called again sometimes and is transmitted plane or user plane by datum plane, and control plane, and management plane is formed.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 provides from end-to-end two-way or unidirectional information transfer service for the user, simultaneously, also will transmit some control and network management informations (in-band method).
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 be told the attributes such as source, place and bandwidth of the required connection of control plane.
Label switching path LSP in the prior art (Label Switched Path is determined by management plane hereinafter to be referred as: detection of connectivity pattern LSP), as shown in Figure 1, at network element R1-〉R6-〉set up a strip label switching path LSP_A between the R5; Management plane disposes the CV pattern of near-end and the far-end of LSP_A on R1 and R5.
If but near-end is different with the far-end configuration, can cause professional obstructed; When network element R1 is managed by different webmasters with R2, may be the equipment of different operators as R1 and R2 particularly, this kind situation can often take place.And this kind pattern need be in the near-end of LSP and far-end configuration twice, and the layoutprocedure workload is big.
Because the configuration of management plane is inconsistent, institute causes the different problem of business in order to solve, and introduced following workaround: management plane is provided with the CV pattern at the far-end of LSP, the CV pattern information is delivered to the near-end of LSP by control plane or datum plane.
In three kinds of CV patterns, the realization of NORM-CV is simple relatively, and is less demanding to the disposal ability of equipment because per second just sends a NORM-CV message, can realize with software; But the message transmission frequency of FFD-CV is higher, if according to the processing speed of 10ms, the disposal ability of equipment is had relatively high expectations, may be subjected to hardware constraints.FEC-CV is then later because standard is released, and need carry out algorithm process to FEC, and therefore now a lot of equipment are not supported.Like this,, and do not support, must cause professional obstructed so at near-end if in the CV pattern of the far-end of LSP configuration.
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 machinery of consultation of connectivity checking mode of multiprotocol label switching, under the inconsistent situation of the CV of LSP near-end and far-end mode capabilities, by the negotiation of near-end and far-end, the CV pattern that decision is fit to; Simultaneously, consider professional demand, possible certain bar LSP must adopt specific a kind of pattern, and at this moment, compatible prior art scheme can force to select a kind of CV pattern at near-end and the far-end of LSP by management plane.
Technical scheme of the present invention is as follows:
A kind of machinery of consultation of connectivity checking mode of multiprotocol label switching, described method comprises:
A), management plane issues the CV pattern configurations information of label switched path;
B), equipment sends to opposite equip. according to described CV pattern configurations information with self CV ability information, and wait for and receive the CV ability information that the opposite end sends over;
C), the CV mode negotiation processing module of the control plane CV ability information of sending according to the opposite end is carried out the CV model selection; And control CV state machine processing module, enable and the selected corresponding state processing mechanism of CV pattern.
Described method wherein, also comprises:
D) if terminal device is unsuccessful to the CV mode negotiation, then send a warning message to management plane.
Described method, wherein, the two ends of described label switched path are after receiving the CV ability information of opposite end, two ends adopt identical sortord to sort to CV ability priority, and select the highest identical CV pattern of priority simultaneously.
Described method wherein, also comprises: when forcing selected a certain CV pattern, the CV ability information that sends to the opposite end is to force selected CV pattern to described management plane to the CV pattern configurations information of local terminal.
Described method, wherein, described CV ability information carries by signaling message.
Described method, wherein, described CV ability information carries by MPLSOAM protocol massages newly-increased in the datum plane or expansion.
Described method wherein, also is included in near-end and supports the CV mode negotiation, and far-end is not when supporting the CV mode negotiation, and near-end is taked follow-up mechanism, according to the CV pattern information of receiving, and the CV pattern of decision near-end.
Described method wherein, also is included in far-end and supports the CV mode negotiation, and near-end is selected a kind of CV pattern by far-end, if near-end is found the CV pattern information of receiving and can't mate with the CV pattern that is disposed that then report and alarm is given management plane when not supporting.
Described method, wherein, described CV ability information is the CV mode capabilities that an end equipment is supported, it comprises the combination of NORM-CV, FFD-CV or FEC-CV.
The machinery of consultation of the connectivity checking mode of a kind of multiprotocol label switching provided by the present invention, by negotiation at near-end and the far-end of LSP, select to use the CV pattern that is fit to, guaranteed that like this near-end selects identical CV pattern simultaneously with far-end, guarantee the realization of service channel, and when switching services, reduced service disconnection.
Description of drawings
Fig. 1 is the structural representation of multi-protocol label switching network of the connectivity checking of prior art;
Fig. 2 carries out the schematic network structure that connectivity checking mode is consulted for multiprotocol label switching of the present invention;
Fig. 3 is the schematic diagram of the multi-protocol label switching network functional structure graduation of the inventive method;
Fig. 4 is the schematic flow sheet of the CV mode negotiation processing procedure in the inventive method;
Fig. 5 is the high-level schematic functional block diagram that datum plane is held consultation of passing through of the inventive method.
Embodiment
Below in conjunction with accompanying drawing, will carry out comparatively detailed explanation to each preferred embodiment of the present invention.
As shown in Figures 2 and 3, the machinery of consultation of the connectivity checking mode of described multiprotocol label switching of the present invention, in multiprotocol label switching system, management plane connects described control plane of control and described datum plane, includes signaling process subsystem, traffic engineering processing subsystem and route processing subsystem in the described control plane; In described signaling process subsystem, be provided with a CV mode negotiation processing module, this CV mode negotiation processing module can be transmitted in the processing subsystem by the message in the described datum plane and obtain route/signaling protocol message, and the CV state machine processing module in the described datum plane is sent CV pattern control command.
The inventive method is finished the detection of connectivity pattern configurations of LSP by management plane, receives the warning information of control plane/datum plane, feeds back to the user.The detection of connectivity pattern configurations of LSP can have following option setting under the control of described management plane:
The CV pattern of Auto---LSP is consulted the back decision by near-end and far-end;
NORM-CV---forcing the CV pattern of LSP is NORM-CV;
FFD-CV---forcing the CV pattern of LSP is FFD-CV;
FEC-CV---forcing the CV pattern of LSP is FEC-CV.
Described control plane is finished the negotiation of LSP near-end and far-end CV pattern, negotiates after the CV pattern control CV state machine processing module; Finish the MPLS message by datum plane and transmit processing and MPLSOAM﹠amp; P handles; For route/signaling protocol message, give control plane and handle.Described message is transmitted processing subsystem identification OAM message, gives MPLS OAM﹠amp with the OAM message; The P processing subsystem; Identification route/signaling protocol message is given control plane and is handled; Simultaneously, finish the protection switching action of MPLS.MPLS OAM﹠amp; The P processing subsystem is finished processing of CV state machine and protection and is switched processing.
Described CV mode negotiation processing module is sent to the opposite end with the CV mode capabilities of local terminal support by signaling message, both sides hold consultation, described CV ability is meant the CV pattern that LSP can support, for example: can support CV, FFD-CV, FEC-CV simultaneously, perhaps be merely able to support CV, FFD-CV, when the CV ability is sent to the opposite end, for every kind of CV pattern, all need to indicate and whether support, therefore the content in the following form need be sent to the opposite end:
| The CV pattern | CV | FFD-CV | FEC-CV |
| Whether support | Be (denying) | Be (denying) | Be (denying) |
Above-mentioned CV ability information can carry by signaling message, when creating LSP, carries out the negotiation of ability.For example, in the Path of RSVP-TE message, carry the CV ability information of LSP far-end, be delivered to the near-end of LSP, carry out the CV model selection, then the RESV message of result by RSVP is passed back to the LSP far-end at the LSP near-end.Perhaps, transmit the CV ability information by CR-LDP.
The process that described CV mode negotiation is handled, as shown in Figure 4, for: if management plane is a kind of fixing pattern with the CV pattern configurations, rather than Auto, then do following processing: if 1 equipment is supported the pattern of management plane configuration, then the CV capabilities setting is become the value of configuration, send to the opposite end, carry out the CV mode negotiation; If 2 equipment are not supported the pattern of management plane configuration, then report and alarm.
If management plane becomes Auto with the CV pattern configurations, do following processing: the ability with CV capabilities setting forming apparatus is supported, send to the opposite end, carry out the CV mode negotiation.
After receiving opposite end CV ability information, do following processing: if both sides do not have the common CV pattern of supporting, then report and alarm; If both sides have identical CV pattern, then carry out prioritization according to certain specification, select the highest pattern of priority; Identical prioritization method is selected at the two ends of LSP, for example can but be not limited to adopt following prioritization, the sequence arrangement that increases progressively according to priority:
NORM-CV——>FFD-CV——>FEC-CV
Or FEC-CV---〉FFD-CV---〉NORM-CV
……
For preventing the different prioritization method of LSP two ends use, the result who consults can be sent to the opposite end; If receive the pattern difference of the CV pattern of opposite end with local terminal, both sides' merit of failing to consultations, report and alarm.
After consulting successfully with the opposite end, with the control of the CV pattern after consulting CV state machine processing module, described CV handles the flow process of module through consultation, as shown in Figure 4, under some situation, may have only LSP wherein one section the CV ability can be sent to the opposite end; At this moment, by an end that receives the CV ability negotiation result is fed back to an other end.
In networking was used, the inventive method the end of following problem: LSP can occur and support the CV mode negotiation, and an other end is not supported.
If the LSP far-end is supported the CV mode negotiation, near-end does not support that then the LSP far-end can not receive the CV ability information or the CV pattern feedback information of opposite end, and a kind of CV pattern that far-end selection equipment is supported sends the CV message to the LSP near-end.If the LSP near-end is found the CV type of message of receiving and can't mate with the CV pattern of configuration that then report and alarm is given management plane.
If the LSP near-end is supported the CV mode negotiation, far-end does not support that the LSP near-end can not receive the CV ability information or the CV pattern feedback information of opposite end, and described LSP near-end can be taked the mode of mode tracking, according to received CV type of message, determine the CV pattern at datum plane.
If near-end can not be discerned received CV type of message, do not support that perhaps then report and alarm is given management plane.
In the described machinery of consultation of the present invention, in the indication of LSP far-end according to the cvModeOper that issues of control plane, its value: NORM-CV or FFD-CV or FEC-CV send corresponding CV message according to given frequency.Y.1711 and ITU-TY.1713 agreement regulation concrete processing procedure sees also ITU-T, does not repeat them here.
In of the cvModeOper that issue (value: NORM-CV or FFD-CV or the FEC-CV) indication of the described CV state machine of LSP near-end processing module, select operation NORM-CV (or FFD-CV or FEC-CV) near-end state machine according to control plane.Y.1711 and ITU-TY.1713 concrete processing sees also ITU-T, and prior art is existing open, does not repeat them here.
(cvModeAdmin when the CV pattern of management plane configuration is not Auto!=Auto), can directly concrete CV treatment mechanism according to the selection of configuration of management plane.If CV state machine processing module detects loss of connectivity, then trigger protection switches that module is carried out fault delivery, protection such as switches at processing.Detailed processing sees also ITU-T agreement regulation Y.1720, and is open for prior art, do not repeat them here.
CV mode negotiation in the inventive method can also be finished by datum plane, by MPLS OAM protocol massages is expanded, in the OAM message of expansion, carry the CV ability information, it is realized as shown in Figure 5, 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, receives the warning information of datum plane, and feeds 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, carry the CV ability information in the OAM message after expansion, by described CV mode tracking processing module the CV pattern is followed the tracks of, obtain and transfer to CV mode negotiation processing module after the CV ability information and hold consultation, according to negotiation result, described control plane sends instruction and selects the corresponding C V model to described CV state machine processing module then; Described CV state machine processing module also according to the connectivity state information in the described MPLS CV message, sends to described protection and switches processing module, switches processing module by described protection and protects when needed and switch.
To sum up, the machinery of consultation of the connectivity checking mode of multiprotocol label switching of the present invention by the CV mode negotiation process of LSP near-end and far-end, has guaranteed two ends selected common CV pattern that is suitable under the inconsistent situation of CV mode capabilities; Allow management plane in the near-end configuration CV of LSP pattern, compatible existing technical scheme; And can adjust the CV pattern of LSP dynamically at far-end, avoid in the mode adjustment process, service disconnection occurring.
Should be pointed out that the above-mentioned description to specific embodiment of the present invention can not be interpreted as the restriction to scope of patent protection of the present invention, its scope of patent protection should be as the criterion with claims.
Claims (9)
1, a kind of machinery of consultation of connectivity checking mode of multiprotocol label switching, described method comprises:
A), management plane issues the CV pattern configurations information of label switched path;
B), equipment sends to opposite equip. according to described CV pattern configurations information with self CV ability information, and wait for and receive the CV ability information that the opposite end sends over; C), the CV mode negotiation processing module of the control plane CV ability information of sending according to the opposite end is carried out the CV model selection; And control CV state machine processing module, enable and the selected corresponding state processing mechanism of CV pattern.
2, method according to claim 1 is characterized in that, described method also comprises:
D) if terminal device is unsuccessful to the CV mode negotiation, then send a warning message to management plane.
3, according to the described method of claim 1, it is characterized in that, the two ends of described label switched path are after receiving the CV ability information of opposite end, and two ends adopt identical sortord to sort to CV ability priority, and select the highest identical CV pattern of priority simultaneously.
4, method according to claim 1 is characterized in that, described method also comprises: when forcing selected a certain CV pattern, the CV ability information that sends to the opposite end is to force selected CV pattern to described management plane to the CV pattern configurations information of local terminal.
According to the described method of the arbitrary claim of claim 1～4, it is characterized in that 5, described CV ability information carries by signaling message.
According to the described method of the arbitrary claim of claim 1～4, it is characterized in that 6, described CV ability information carries by MPLS OAM protocol massages newly-increased in the datum plane or expansion.
7, method according to claim 1 is characterized in that, described method also is included in near-end and supports the CV mode negotiation, and far-end is not when supporting the CV mode negotiation, and near-end is taked follow-up mechanism, according to the CV pattern information of receiving, and the CV pattern of decision near-end.
8, method according to claim 1, it is characterized in that, described method also is included in far-end and supports the CV mode negotiation, and near-end is not when supporting, select a kind of CV pattern by far-end, if near-end is found the CV pattern information of receiving and can't mate with the CV pattern that is disposed that then report and alarm is given management plane.
9, method according to claim 1 is characterized in that, described CV ability information is the CV mode capabilities that an end equipment is supported, it comprises the combination of NORM-CV, FFD-CV or FEC-CV.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011015102A1 (en) * | 2009-08-07 | 2011-02-10 | 华为技术有限公司 | Method and network device for associated channel capability negotiation |
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| US6973057B1 (en) * | 1999-01-29 | 2005-12-06 | Telefonaktiebolaget L M Ericsson (Publ) | Public mobile data communications network |
| US6611532B1 (en) * | 1999-12-07 | 2003-08-26 | Telefonaktielbolaget Lm Ericsson (Publ) | Methods and apparatus for integrating signaling system number 7 networks with networks using multi-protocol label switching |
| KR100703499B1 (en) * | 2000-12-09 | 2007-04-03 | 삼성전자주식회사 | Database structure for implementing traffic engineering function in multi protocol label switching system and constructing method thereof |
| DE10147748A1 (en) * | 2001-09-27 | 2003-04-17 | Siemens Ag | Method and device for adapting label-switched paths in packet networks |
| US6970464B2 (en) * | 2003-04-01 | 2005-11-29 | Cisco Technology, Inc. | Method for recursive BGP route updates in MPLS networks |
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Effective date of registration: 20180503 Address after: California, USA Patentee after: Global innovation polymerization LLC Address before: London, England Patentee before: GW partnership Co.,Ltd. Effective date of registration: 20180503 Address after: London, England Patentee after: GW partnership Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |
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