CN1913526B - Automatic discovery method of wave transmission system link - Google Patents
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Abstract
This invention relates to a method and a device for automatically discovering wave division transmission system links, in which, the method includes: a source node sends link connection test information to an aim node by the electric layer overhead traffic of the wavelength on said link, which receives said test information and verifies the link for conection, if the verification is successfully, then it feeds back the successful information to the source end node, which receives the information and finishes the automatic discovery process of said link.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to the method that a kind of wave transmission system link is found automatically.
Background technology
Traditional wavelength-division network is a kind of static network of point-to-point, the appearance of ROADM/WSS (Reconfigurable Optical Add/drop Multiplexer/wavelength-selective switches) technology makes the mobilism of wavelength-division network become possibility, makes operator need not to redesign network new business and dynamically increase/modification Network just can be provided.In order further to reduce operation maintenance cost, (Automatically SwitchedOptical Network, ASON) technology is inevitable in conjunction with just becoming, and then has formed intelligent wavelength-division optical-fiber network for wave-division device and ASON.
Optical fiber link is present in fibre circuit interface unit (the Fiber Interface Unit of adjacent wavelength-division, FIU) between, it can carry the wavelength business, as long as optical conversion element (OpticalTransponder Unit in any two wavelength-divisions, OTU) disposed the wavelength business between the veneer, just have so two-way wavelength link, it can carrier wavelength business.These links are called flow engineering link in ASON.In ASON, these flow engineering links are used for bearer service, are the bases of service dispatching.Along with new business is on the increase, have up to a hundred optical fiber between two switching equipment of future network, up to a hundred wavelength paths are arranged again on every light.If like this numerous link is carried out manual configuration and control is infeasible fully.General multiple protocols label exchange (Generalized Multiprotocol Label Switching, GMPLS) introduced LMP Link Manager Protocol (Link Manager Protocol, LMP), the management of finishing on the plane classification, binding, sign, availability and the fault location of data link can transmitted, also can on control plane, finish maintenance, tentatively realize intellectuality control channel self.Yet transmitting Intellectualization of Optical Network is that the artificial intervention of expectation reduces as far as possible, the capacity of self-regulation of network, and the ability of reasonable distribution link circuit resource constantly strengthens.This not only needs the further refinement, perfect of Link Resource Manager agreement, the mechanism that more needs to be correlated with cooperates development, as the monitoring technology of auto discovery mechanism, optical link performance and with the raising of management plane data exchange capability, they be complement each other, the organic whole of mutual restriction.
Wherein, the checking of LMP connectivity of link is the requisite process of chain-link automatic finding, the connectedness of the main checking of connectivity of link checking particular data link, it is by the connectivity of exchange physical interface index checking physical channel, by in the physical channel, transmitting test post, in control channel, transmit test result message and finish.Most of checking message is transmitted in control channel, has only test post also different by the concrete transfer mechanism of physical channel transmission and distinct device.Wherein, control channel is used for carrier signaling, route and network management information between two adjacent nodes.Between a pair of node, may there be a plurality of control channels simultaneously, it is always readily available should guaranteeing to have at least a channel, when a control channel failure, switches to the another one control channel with can not adding negotiation.In wavelength-division network, the physical channel exists photosphere and two kinds of expense pattern of electricity layer: the photosphere expense is to be put into an Optical Supervisory Channel (Optical Supervisory Channel, OSC) transmit on, and Optical Supervisory Channel OSC be used as one independently wavelength channel transmit section with light and combine, in optical fiber, transmit then, all Optical Supervisory Channel OSC can be taken out at each website receiving terminal, deliver to host process after photosphere expense is wherein extracted; Electricity layer expense is the expense that increases when client signal converts the standard wave length to, can not handle along the node (except the electric via node) of road process, until end-node just can be extracted electricity layer expense when the standard wave length is converted to client signal again and handle electricity floor overhead extraction.
In the prior art, utilize the photosphere expense on the Optical Supervisory Channel that the physical channel is provided,, finish the proof procedure of connectivity of link, and then realized the automatic discovery of optical fiber link between the node by this physical channel transmitting-receiving LMP agreement TEST message.But this scheme has two shortcomings: the one, and this method needs each wavelength-division all to dispose independent light monitoring and controlling channels OSC unit module and is used to extract the photosphere expense, increases cost; In addition, this Optical Supervisory Channel unit module is easy to damage, in case damage, optical fiber link just can't continue to finish the link verification process, and then can't realize rediscovering of optical fiber link.
In another prior art, under the situation of no available photosphere expense,, walk around the connectivity of link proof procedure by link far-end information manually is set, directly carry out the consistency correlating validation, and then finish the discovery of optical fiber link.Like this, this process need manual intervention can not be satisfied " automatically find ", in addition, if physical link exists error code and nothing really not to be connected, will think mistakenly that this link can use, and causes verifying that the link that passes through is still unavailable.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide the method that a kind of electricity layer expense of utilizing wavelength realizes the automatic discovery of wavelength link and optical fiber link, overcome the defective of utilizing the photosphere expense can't realize the wavelength chain-link automatic finding, overcome simultaneously and when Optical Supervisory Channel OSC damages, utilized the photosphere expense can't realize the problem that optical fiber link is found again automatically.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides the method that a kind of wave transmission system link is found automatically, comprising:
The source end node sends the authentication mechanism negotiation message to destination node; The respective field of described authentication mechanism negotiation message is filled to be wavelength link mode or optical fiber link pattern;
Described destination node receives described authentication mechanism negotiation message, if described destination node is supported described wavelength link mode or described optical fiber link pattern, then return authentication mechanism and consult success message, and the present mode of the optical conversion element OTU of local terminal is done corresponding modify to described source end node;
Described source end node sends the connectivity of link test post by the electricity layer expense of wavelength on the link to described destination node;
Described destination node receives described connectivity of link test post, the present mode of described OTU by judging local terminal is determined the test post that test post that described connectivity of link test post is the wavelength link verification or optical fiber link are verified, then according to determining that the result carries out the corresponding link Connectivity Verification, if be proved to be successful then to described source end node return link Connectivity Verification success message;
Described source end node receives after described connectivity of link is proved to be successful message, carries out link consistency correlating validation, finishes the automatic discovery of described link.
Wherein, when described link was the wavelength link, the electricity layer expense of described wavelength was the electricity layer expense on this wavelength.
Wherein, when described link was optical fiber link, the electricity layer expense of described wavelength was the electricity layer expense on arbitrary wavelength of this optical fiber link.
Wherein, described connectivity of link test post is the test post that comprises interface identifier and checking sign.
As seen from the above technical solution provided by the invention, adopt method of the present invention, overcome the defective of utilizing the photosphere expense can't realize the wavelength chain-link automatic finding, overcome simultaneously and when Optical Supervisory Channel OSC damages, utilized the photosphere expense can't realize the problem that optical fiber link is found again automatically, also avoided manual intervention to cross Connectivity Verification.
Description of drawings
Fig. 1 is the LMP agreement BEGIN_VERIFY object schematic diagram of one embodiment of the invention;
Fig. 2 is the wavelength chain-link automatic finding schematic diagram of one embodiment of the invention;
Fig. 3 is the wavelength chain-link automatic finding scheme schematic diagram of one embodiment of the invention;
Fig. 4 finds schematic diagram automatically for the optical fiber link of one embodiment of the invention;
Fig. 5 finds the scheme schematic diagram automatically for the optical fiber link of one embodiment of the invention.
Embodiment
Core concept of the present invention provides the automatic discovery that a kind of electricity layer expense by wavelength on the wavelength link realizes the automatic discovery of wavelength link and realize optical fiber link by the electricity layer expense of wavelength on the optical fiber link.The defective that adopts this method to overcome to utilize the photosphere expense can't realize the wavelength chain-link automatic finding has overcome simultaneously and has utilized the photosphere expense can't realize the problem that optical fiber link is found again automatically when Optical Supervisory Channel OSC damages.
Connectivity of link checking of the present invention is mainly used in the connectedness of verification msg link, also can be used for exchanging the sign of link in RSVP-TE and CR-LDP signaling.Its test post by sending the Ping class is the verification msg link one by one, comprises that in the link bundle of one group of optical fiber each forms link, and wherein test post has comprised the interface identifier and the checking sign of link, and described test post transmits by data link.
For the present invention there being further understanding, method of the present invention is described further below in conjunction with accompanying drawing.
Present embodiment electricity consumption layer expense, (as transmission medium operation LMP agreement, receiving-transmitting chain checking message is finished the automatic discovery of wavelength link for optical channel data unit, the ODU) GCC1 of expense as the optical channel data cell.
At first, expansion LMP agreement is so that the LMP agreement is supported wavelength link verification and optical fiber link checking, and increased the test post processing unit in the LMP protocol entity, is used for sending or extract the continuity testing message of the electricity layer expense of wavelength.Figure 1 shows that the BEGIN_VERIFY object schematic diagram of LMP agreement, VerifyTransport Mechanism increases by two kinds of Validation Mode: LAMBDA_LINK_MODE and FIBER_LINK_MODE on original J0, DCC basis, wherein, LAMBDA_LINK_MODE is used to identify the TEST message of transmitting-receiving wavelength link verification, and FIBER_LINK_MODE is used to identify the TEST message of transmitting-receiving optical fiber link checking.Generally, the OTU acquiescence is only supported wavelength link verification pattern LAMBDA_LINK_MODE, can be used to find optical fiber link if specify, then support two kinds of patterns of wavelength link verification pattern LAMBDA_LINK_MODE and/or optical fiber link checking FIBER_LINK_MODE.
Consult shown in Figure 2ly, realize a kind of application scenarios of wavelength link discovery for the electricity layer expense of utilizing wavelength.The wavelength link is present between any two nodes, as node A among Fig. 2 is the source end node, Node B is a destination node, and each node comprises following wavelength division unit module: WSS (wavelength-selective switches), MUX (multiplexer), DMUX (demodulation multiplexer)), FIU (fibre circuit interface unit), OTU (optical conversion element).Described wavelength division unit module all is a veneer independently, and wherein, OTU is used for wavelength conversion as optical conversion element, is the top and the end of wavelength link.May there be a plurality of wavelength-division nodes between source end node A and the destination node B, wherein said wavelength-division node can be the wavelength-division node identical with destination node B with source end node A, also can be and do not comprise FIU and OTU wavelength division unit module, only be used for the wavelength-division node that wavelength intersects.WSS, MUX, DMUX module are used to realize that wavelength intersects, and also can replace with Reconfigurable Optical Add/drop Multiplexer optical cross-connect OXC, as long as the module that substitutes can realize the wavelength interleaving function.
Disposed on the end node A of source OTU＜-bi-directional wavelength of FIU intersects, also disposed on the destination node B OTU＜-bi-directional wavelength of FIU intersects, therefore can generate two-way wavelength link (shown in Fig. 2 dotted line) respectively between source end node A and destination node B, the initial condition of described wavelength link is DOWN.
In an embodiment of the present invention, control channel is used to transmit the LMP agreement except TEST message, and this control channel both can adopt also can adopt outside the band in the band; Wherein, in-band channel is meant signaling and the same channel of data sharing, and outband channel is meant the transmission channel of the transmission channel of control information and data is separated that promptly signaling is separated transmission with business.Referring to shown in Figure 3, be the scheme schematic diagram, visible control channel and the transmission of TEST message overhead byte are irrelevant.
The process of the wavelength chain-link automatic finding between source end node A and the destination node B is:
31) after master control borad detects the OTU veneer and reaches the standard grade, create the OTU control interface, be used for sending or receive connective TEST message, create control channel by the LMP agreement in the electricity layer expense of wavelength, and the negotiations process of start-up control channel;
32) after control channel was consulted to pass through, the control channel state was UP, and the OTU light mouth in wavelength link correspondence sends checking message then, carried out the authentication mechanism of wavelength link and consulted;
33) after the authentication mechanism of wavelength link is consulted successfully, on the control interface of wavelength link correspondence, receive and dispatch the TEST message that is used for the wavelength link verification and carry out the connectivity of link checking, if the Connectivity Verification success is then returned the Connectivity Verification success message to source end node A;
34) after end node A in source receives the Connectivity Verification success message, carry out link consistency correlating validation, finish the automatic discovery of link.
Wherein, the negotiation of the authentication mechanism of wavelength link described step 32) comprises:
321) at source end node A, the LMP protocol entity is filled to LAMBDA_LINK_MODE with the BeginVerify object Verify Transport Mechanism field of LMP negotiation message, sign is used to receive and dispatch the TEST message of wavelength link verification, and this BeginVerify message is sent to destination node B; Wherein BeginVerify message is also carried information such as authentication interval, data link number, type of coding, transmission rate, wavelength;
322), after the LMP protocol entity is received this negotiation message,, then return and consult success message BeginVerifyAck to source end node A if local terminal OTU supports the LAMBDA_LINK_MODE pattern at destination node B; Local terminal OTU present mode is revised as LAMBDA_LINK_MODE, and on the OTU control interface, extracts connectivity of link TEST message.
Wherein, the checking of wavelength connectivity of link described step 33) comprises:
After source end node A receives and consults success message BeginVerifyAck, on the OTU control interface, send TEST message, carry out Connectivity Verification.
Wherein, TEST message has been carried the port/interface numbering of this data link numbering and source end node A, destination node B quickens specific proof procedure with the checking sign, and mapping purpose interface identifier is given corresponding local value, because a TEST message can only be used to verify the connectedness of a direction, in general, can configuration A---between source end node A and the destination node B〉B direction and and B---〉the bi-directional wavelength link of A direction, so the checking of link needs transmitting-receiving TEST message twice, LMP agreement transmitting-receiving TEST message is finished A---〉the Connectivity Verification process of the wavelength link of B direction is as follows:
Source end node A sends the process of TEST message to destination node B: source end node A finds the OTU light mouth of wavelength link correspondence, sends TEST message then on the control interface of this OTU;
Destination node B receives the TEST message that source end node A sends at the process that receives TEST message on the OTU: destination node B on the OTU control interface, the LMP protocol entity finds that OTU is in the LAMBDA_LINK_MODE pattern, judge that received message is the TEST message that is used for the wavelength link verification, enter wavelength link verification process, if the wavelength link verification is passed through, destination node B sends the test mode success message by control channel, wherein the test mode success message has carried the interface identifier of destination node B, returns distant-end node A; If destination node B can not receive TEST message in authentication at interval, then send the test mode failed message to distant-end node A reporting errors by control channel.Finish A---like this〉Connectivity Verification on B direction wave long-chain road.
Source end node A also will return test mode response TestStatusAck message by control channel and confirm, when all wavelengths link verification finishes, source end node A will send EndVerify message by control channel, and destination node B returns EndVerifyAck end of message whole verification process after receiving EndVerify message.
Wherein the control interface of OTU is an abstract logic interfacing of coming out on the physics light mouth of OTU, can send message (as the Socket message) with it, and it is not limited to the message message of transmitting-receiving control channel, also can be used to receive and dispatch TEST message.And control channel is a passage in logic, can be understood as a link, consults to have passed through, and just can send the message that application program needs in the above.
In like manner, by the LMP agreement, destination node B sends the TEsT message be used for the wavelength link verification to source end node A, and the TEST message that source end node A processing intent Node B sends is finished B---〉Connectivity Verification on A direction wave long-chain road.
A---〉B direction and B---〉after the Connectivity Verification on A direction wave long-chain road all passes through, finish the Connectivity Verification of wavelength link between source end node A and the destination node B.
Wherein, described step 34) carry out link consistency correlating validation in, source end node A has understood relevant wavelength connection relationship with destination node B, the service bearer ability, thus realized the automatic discovery of relevant wavelength link.Wherein, link consistency correlating validation exchange link attribute can dynamically change the characteristic of link, as increasing link, change link protection mechanism, changing port identifiers etc.
Different with the wavelength link, optical fiber link exists only between the adjacent node, the present invention utilizes the electricity layer expense of wavelength, GCC1 as ODU (optical channel data cell) expense, as transmission medium, the TEST message of transmitting-receiving LMP agreement is finished the Connectivity Verification of optical fiber link, and then is realized the automatic discovery of this optical fiber link.
Consult shown in Figure 4, for the electricity layer expense of utilizing wavelength realizes a kind of application scenarios that optical fiber link is found, described optical fiber link to be found exists only between the adjacent node, as source end node A and destination node B among Fig. 4, each node comprises following wavelength division unit module: WSS, MUX, DMUX, FIU, OTU.Described wavelength division unit module all is a veneer independently, and wherein, FIU is the fibre circuit interface, is used to connect optical fiber, is the top and the end of optical fiber link.Link to each other by optical fiber between source end node A and the destination node B, between do not have other nodes identical with source end node A, but between may exist other not comprise the wavelength-division of FIU and OTU wavelength division unit module.
Disposed on the end node A of source OTU＜-bi-directional wavelength of FIU intersects, also disposed on the destination node B OTU＜-bi-directional wavelength of FIU intersects, therefore can generate two-way wavelength link (shown in Fig. 4 dotted line) respectively between source end node A and destination node B, the initial condition of described wavelength link is DOWN.In an embodiment of the present invention, control channel both can adopt in-band method also can adopt out-band method, referring to shown in Figure 5, was the scheme schematic diagram, and visible control channel and overhead byte transmission are irrelevant.
Be used for finding optical fiber link if two OTU of this on source end node A and the destination node B are designated, just can utilize the connective TEST message of electricity layer expense receiving-transmitting chain of wavelength, and then realize the automatic discovery of associated fiber link.
51) after master control borad detects the OTU veneer and reaches the standard grade, create the OTU control interface, be used for electricity layer expense at wavelength and send or receive connective TEST message, the LMP agreement begins to create control channel, and the negotiations process of start-up control channel;
52) after control channel is consulted to pass through, send checking message, carry out the authentication mechanism of optical fiber link and consult at the OTU of optical fiber link correspondence light mouth;
53) after the authentication mechanism of optical fiber link was consulted successfully, the connective TEST message of receiving-transmitting chain was carried out the connectivity of link checking on the control interface of optical fiber link correspondence, if the Connectivity Verification success is then returned the Connectivity Verification success message to source end node A;
54) after end node A in source receives the Connectivity Verification success message, after Connectivity Verification passes through, carry out the link consistency checking, finish the automatic discovery of link.
Wherein, described step 52) in, after control channel is consulted to pass through, the control channel state is UP, the checking of all links of LMP protocol entity start node, when authenticating to optical fiber link, source end node A and destination node B find the OTU light mouth corresponding with optical fiber link according to the wavelength intersection respectively, carry out the optical fiber link authentication mechanism then and consult.The negotiations process of authentication mechanism is as follows:
521) at source end node A, the LMP protocol entity is filled to FIBER_LINK_MODE with the Verify Transport Mechanism field of the BEGIN_VERIFY object of LMP negotiation message, sign is used to receive and dispatch the TEST message of optical fiber link checking, and this BeginVerify message is sent to destination node B; Wherein BeginVerify message is also carried information such as authentication interval, data link number, type of coding, transmission rate, wavelength;
522) at destination node B, after the LMP protocol entity is received this negotiation message, if the OTU of local terminal optical fiber link correspondence supports the FIBER_LINK_MODE pattern, return negotiation success message BeginVerifyAck to the master end, and local terminal OTU present mode is revised as FIBER_LINK_MODE, and on the OTU control interface, extract TEST message.
Wherein, the optical fiber link Connectivity Verification comprises described step 53):
After source end node A receives and consults success message BeginVerifyAck, on the OTU control interface, send TEST message, carry out the Connectivity Verification of optical fiber link.
Wherein, TEST message has been carried the port/interface numbering of this data link numbering and source end node A, destination node B quickens specific proof procedure with the checking sign, and mapping purpose interface identifier is given corresponding local value, because a TEST message can only be used to verify the connectedness of a direction, in general, source end node A and destination node B can dispose one group of (two) optical fiber and realize A---respectively〉optical fiber link and the B---of B direction〉optical fiber link of A direction, carry out A---so the checking of link needs source end node A to send TEST message to destination node B〉the optical fiber link Connectivity Verification of B direction, destination node B sends TEST message to source end node A and carries out B---〉the optical fiber link Connectivity Verification of A direction, as follows by LMP agreement transmitting-receiving TEST message process:
Source end node A sends the process of connectivity of link TEST message to destination node B: source end node A finds the OTU light mouth corresponding with optical fiber link according to the wavelength intersection, and then find corresponding OTU control interface, send the TEST message that is used for the optical fiber link checking then thereon;
Destination node B is receiving the process that is used for optical fiber link checking TEST message on the OTU: after destination node B receives the TEST message of source end node A transmission, the LMP protocol entity finds that OTU is in the FIBER_LINK_MODE pattern, judge that the message that receives is connectivity of link TEST message, intersect according to wavelength then and find FIU light mouth with optical fiber link, enter the relevant optical fiber link proof procedure of this FIU, if the optical fiber link checking is passed through, destination node B sends the test mode success message by control channel, wherein the test mode success message has carried the interface identifier of destination node B, returns distant-end node A; If destination node B can not receive TEST message in authentication at interval, then send the test mode failed message to distant-end node A reporting errors by control channel.The A---that finishes like this like this〉the Connectivity Verification of one-way optical fiber link between the B.
Source end node A also will return test mode response TestStatusAck message by control channel and confirm, when all wavelengths link verification finishes, source end node A will send EndVerify message by control channel, and destination node B returns EndVerifyAck end of message whole verification process after receiving EndVerify message.The Connectivity Verification of optical fiber link can transmit by the electricity layer expense of arbitrary wavelength of carrying on the optical fiber, also can send by specified wavelength.
In like manner, by the LMP agreement, destination node B sends connectivity of link TEST message to source end node A, and the TEST message that source end node A processing intent Node B sends is finished B---〉Connectivity Verification of the optical fiber link of A direction.
A---〉B direction and B---〉after the Connectivity Verification of optical fiber link of A direction all passes through, finish the Connectivity Verification of optical fiber link between source end node A and the destination node B.
Wherein, described step 54) carry out link consistency correlating validation in, source end node A has understood relevant optical fiber connection relation with destination node B, the service bearer ability, thus realized the automatic discovery of relevant optical fiber link.
In sum, the present invention increases by two kinds of Validation Modes of wavelength link verification and optical fiber link checking by expansion LMP agreement, utilizes the TEST message of the electricity layer expense transmitting-receiving LMP agreement of wavelength, finish the Connectivity Verification of wavelength link or optical fiber link, and then realize the automatic discovery of link.
The above; only for preferred implementation 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 claim.
Claims (4)
1. the method that wave transmission system link is found automatically is characterized in that, comprising:
The source end node sends the authentication mechanism negotiation message to destination node; The respective field of described authentication mechanism negotiation message is filled to be wavelength link mode or optical fiber link pattern;
Described destination node receives described authentication mechanism negotiation message, if described destination node is supported described wavelength link mode or described optical fiber link pattern, then return authentication mechanism and consult success message, and the present mode of the optical conversion element OTU of local terminal is done corresponding modify to described source end node;
Described source end node sends the connectivity of link test post by the electricity layer expense of wavelength on the link to described destination node;
Described destination node receives described connectivity of link test post, the present mode of described OTU by judging local terminal is determined the test post that test post that described connectivity of link test post is the wavelength link verification or optical fiber link are verified, then according to determining that the result carries out the corresponding link Connectivity Verification, if be proved to be successful then to described source end node return link Connectivity Verification success message;
Described source end node receives after described connectivity of link is proved to be successful message, carries out link consistency correlating validation, finishes the automatic discovery of described link.
2. method according to claim 1 is characterized in that, when described link was the wavelength link, the electricity layer expense of described wavelength was the electricity layer expense on this wavelength.
3. method according to claim 1 is characterized in that, when described link was optical fiber link, the electricity layer expense of described wavelength was the electricity layer expense on arbitrary wavelength of this optical fiber link.
4. method according to claim 1 is characterized in that, described connectivity of link test post is the test post that comprises interface identifier and checking sign.
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| CN114785698B (en) * | 2022-05-11 | 2023-06-27 | 武汉光迅科技股份有限公司 | Topology discovery and connectivity verification method and device in ROADM system |
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| WO2003056755A1 (en) * | 2001-12-21 | 2003-07-10 | Nortel Networks Limited | Method for automated connection discovery in optical networks |
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