CN1315294C

CN1315294C - Method for realizing universal multi-protocol mark exchange in network

Info

Publication number: CN1315294C
Application number: CNB031228976A
Authority: CN
Inventors: 李立祥
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2003-05-07
Filing date: 2003-05-07
Publication date: 2007-05-09
Anticipated expiration: 2023-05-07
Also published as: CN1549521A

Abstract

The present invention provides a method for realizing generalized multi-protocol label switching (GMPLS) in a network, which comprises: setting a label space type used by each traffic engineering link circuit (TE link circuit) and the specific format parameters of labels in a label space in the network; starting to use the set TE link circuit; sharing resources when different LSPs pass through the same link circuit in the process of creating, maintaining and deleting the LSPs. The method can be used for realizing the flexible mapping of the labels and the real resources in a GMPLS system, can solve the problem that different LSPs can not use the same physical resource because of the rule of one-to-one correspondence between the labels and the real resource in the prior art, and can also realize the complete control of all resources passing a path when the LSPs are created; the method increases the sharing capability of network resources and realizes the optimal utilization of the network resources.

Description

A kind of method that in network, realizes GMPLS

Technical field

The present invention relates to GMPLS (GMPLS) technology, be specifically related to a kind of method that in network, realizes GMPLS.

Background technology

Along with the flourish people of Internet have also proposed higher demand to the application of network.The MPLS technology is exactly a kind of emerging technology that develops for the problem of the quick forwarding that solves message in the IP network and service quality (QoS) assurance and traffic engineering.MPLS is used for improving the forwarding speed of router and an agreement proposing, but because the performance of MPLS in traffic engineering (te) and these two very crucial in present IP network technology of VPN (virtual private network) (VPN), MPLS becomes the major criterion that enlarges the IP network scale day by day.

The key of mpls protocol is a notion of having introduced label (Label).It is a kind of weak point easy-to-handle, do not comprise topology information, only have an information content of local sense.The Label weak point is to handle in order to be easy to, and can directly quote by index of reference usually.Only having local sense is for the ease of distributing.The essential characteristic of MPLS technology is: enter the message of mpls domain for each, traffic classification according to message, edge router distributes a mark to it, since then, all MPLS routers are directly transmitted by mark after receiving this message that marks, simultaneously mark is modified to the new mark of own and next router agreement, so after the message of tape label leaves mpls domain, goes out with the IP message again.When the message of this tape label left mpls domain, label was separated by edge router.The quality of service type of MPLS packet can be decided by the various parameters of MPLS edge router according to IP bag, as parameters such as the source address of IP, destination address, port numbers, COS (TOS) values.As for the IP bag that arrives same destination, can set up different forward-paths according to the requirement of its TOS value, to reach its requirement to transmission quality.Simultaneously, by management, can also effectively solve load balancing and congestion problems in the network to special route.As when appearance in the network is congested, the new forwarding route of the foundation that MPLS can be real-time is shared its flow, with alleviating network congestion.

In optical transport network, what adopt when the user provides business is static configuration on the other hand, and bandwidth can only carry out the setting one by one of each website and then offer the user using by hand.Professional modification or maintenance also are to rely on manual finishing.Need to provide the mechanism cover automation, intelligence in the application.

GMPLS (GMPLS) is that the MPLS technological expansion is applied in the optical transfer network, with the optical transfer network intellectuality, make network can realize the bandwidth on-demand supply, realize the optimization utilization of Internet resources, provide abundant difference business to supply different application needs, and guarantee the bearing capacity good the upper strata switching network.

Using the network of GMPLS is made up of two essential elements: node (be called as LSR equally, LSR) and the path (be called as label switched path equally, LSP).But the LSR of GMPLS comprises all types of nodes, can be packet switching (PSC) node, also can be Time Division Multiplexing node, wavelength exchange (LSC) node or optical fiber exchange (FSC) node; LSP both can be a virtual path that transmits the IP bag, also can be a TDM special line, or the radio frequency channel of a dense wave division multipurpose (DWDM).

The network of this application GMPLS has comprised various exchanged forms: packet switching, circuit switching even light exchange, so the fragment of one section regular length that mark no longer only is a message to be increased previously also can be time slot, wavelength, an optical port in the optical-fiber network but be extended to; It no longer is to come packet is transmitted by heading that mark is transmitted, but has become the time slot interconnection of equipment in the optical-fiber network, wavelength exchange, goes into, goes out mark corresponding concrete respectively time slot and wavelength.

In GMPLS,, a plurality of physical links can be bundled into a TE Link for the convenience of traffic engineering.The characteristics of TE Link are to have unified TE parameter, carry out route according to the formed network topology of TE Link after this binding and calculate, and can reduce the expense that the routing iinformation diffusion needs, and simplify network topology, make things convenient for routing.In addition, in the present SDH/SONET equipment, to the time slot on the same physical port, may be configured to different attributes, like this, a port may be divided into different a plurality of links and carry out routing and road construction.This TE Link is that a kind of logic exists, optical fiber that may corresponding one or more reality also may be striding of the foundation LSP of a plurality of nodes.If stride the LSP of a plurality of nodes, the first and last node of this LSP just becomes the node of when the pathfinding " direct neighbor " by this TE Link.The process of routing is carried out in this virtual topology that is formed by TE Link.

Briefly introduce processing method and flow process in present GMPLS framework below.

At first from big aspect, the GMPLS framework can be divided into three parts: the one, to the configuration of network basic resources such as node and link; The 2nd, select or calculating path; Three are to use set path to set up LSP, take the Internet resources on the respective paths and provide bandwidth to use to the user.

Configuration to the network link resource is as follows:

At first in network, set TE Link between each adjacent node.In this step processing, be included in the address that each node is set Member Link, set the synthetic TE Link of which bar Member Link bindings group, set the address of TE Link.The various TE attributes of each Member Link that TE Link comprised (comprise that link is to support time gas exchange, wavelength exchange, still port exchange, and other needs the attribute considered such as protection level etc. in the routing process of traffic engineering) must unanimity.

Then use LMP Link Manager Protocol (LMP) to carry out link TE the attribute mutual circular and the inspection of (comprising the attribute of TE Link and the attribute of the Member Link that it comprises).Just can be used by later TE Link, promptly can use the resource (time slot, wavelength or port) on the link in routing with when setting up LSP.If do not pass through, reporting errors then, TE Link is disabled, can not set up the LSP by this link.This process relates to control channel configuration (Control channelconfiguration), link annexation verification (Link Verification), the link attribute correlating validation processes such as (Link property correlation) of LMP agreement.

Path selection or calculating:

Set up LSP and bandwidth is offered the user and use, at first want first node and the end-node (i.e. two of Ye Wu beginning and end end nodes) of clear and definite LSP, and the attribute specification (as much bandwidth, protection class or the like) of LSP needs.The path be selected or be calculated to network need according to user's requirement.Can act on Routing Protocol and algorithm calculates,, also can manually specify a complete path such as Open Shortest Path First (OSPF-TE) with the traffic engineering expansion.This path generally obtains by calculating or manually specifying at first node, can be assigned to and use which bar TE Link, also can further be assigned to use which mark on which bar TE Link.

Use set path to set up and safeguard LSP:

Use the signaling protocol of GMPLS,, set up LSP as RSVP.The process of setting up is initiated by first node, up to end-node, begins upstream to return successively response by end-node again.First node is set up LSP and is completed successfully after receiving and setting up response and handle successfully.The bandwidth that equipment on the first and last node can bring into use this LSP to provide is provided the user, transmits the information data of oneself.

If in the process in selected path, only specified TE Link, when setting up LSP, determine to use on this TE Link which bar Member Link (if TE Link has many Member Links) and concrete which resource (time slot, wavelength, port) so.If in the process in selected path, both specified TE Link, also specified the mark that uses on the TE Link, if TE Link comprises a plurality of Member Links so, two nodes that the upstream and downstream of this link is adjacent will carry out member's link selection, determine to use which Member Link.

In present this processing framework, concrete which resource of using when usage flag represents to set up this LSP.The use of mark lacks flexibility in the GMPLS technical system at present, has made some unified regulations for the mark on the interface (as time slot interface-crossover, lambda switch capable in the optical-fiber network) of non-packet switch type.To the time slot interface-crossover of SDH (Synchronous Digital Hierarchy) (SDH, Synchronous Digital Hierarchy) and Synchronous Optical Network (SONET, Synchronous Optical Network), the mark on it has been made specified in more detail.This specified in more detail makes in GMPLS, to the mark that uses on such interface no longer just the mark in MPLS have local sense, but had whole network unified format and meaning.This hard and fast rule make that it is unfavorable that scheduling and the granularity of intersecting may occur expanding when diminishing in the bandwidth capacity increase of interface simultaneously.Simultaneously, these marks must could be determined concrete implication on an optical port, thereby can only be that a port forms a label space.Become at a plurality of port bindings that (link on each port is exactly a Member Link under the situation of a link, be exactly total be bound into the link TE Link), because the mark on the different port may be identical, can determine employed concrete time slot so also will add the information of Member Link.This is just top to be the reason that the Member Link selection course certainly exists to set up the LSP process.And the selection of member's link can only be carried out by two adjacent nodes by the TE Link under it, and source node can't be specified which the bar Member Link that uses a TE Link when initiating to set up a LSP like this.

The wavelength mark has only been stipulated that at present length is 32 bits, do not stipulated concrete form, neither one mark and the actual regulation of using the corresponding relation of wavelength, the processing method after also the neither one configuration makes mistakes.

Summary of the invention

The above-mentioned mark that the objective of the invention is to overcome prior art lacks flexibility with concrete resource mapping relations, Different L SP can not shared resource, between node during the no-protocol merchant human configuration easily make mistakes, do not have the shortcoming of mark and the regulation of the actual corresponding relation that uses wavelength, a kind of method that realizes GMPLS (GMPLS) in network is provided.Described method comprises:

Set in the described network the concrete format parameter of mark in the employed label space type of each flow engineering link (TE Link) and label space;

Enable and set the TE Link that finishes;

Set up, safeguard and the process of deletion LSP in, different LSP is during through same link, shared resource.

Alternatively, but described enabling set the TE Link usage flag space negotiations process finish and between link-attached two adjacent nodes, carry out label space and consult, and after consulting successfully, enable automatically.

Alternatively, when setting up label switched path (LSP), in assigned tags on the first node and control the physical resource that uses on the link of LSP process.

Preferably, the tag format in employed label space type of described setting TE Link and the label space comprises step:

Set the employed label space type of each TE Link of each node in the described network, described node comprises optical port, wavelength switching node, SDH (Synchronous Digital Hierarchy) (SDH) node and Synchronous Optical Network (SONET) node, and the employed label space type of described TE Link comprises TE Link label space and Member Link label space;

According to the tag format in the employed label space type setting of the described TE Link of the setting label space.

Alternatively, described usage flag space negotiations process is carried out label space and is consulted to comprise step between link-attached two adjacent nodes:

Between the adjacent node type of the employed label space of described TE Link set and parameter thereof being carried out label space in described network consults;

Judge whether described label space negotiation is passed through,

If described negotiation is not passed through, the change Link State with identify on this link resource not

Can be used to set up label switched path (LSP), show the configuration error of described adjacent node, restart negotiations process after the prompting modification configuration according to negotiation result about the attribute of described TE Link,

If described negotiation is passed through, then change Link State and can be used to set up LSP with the resource that identifies on this link.

Preferably, comprise step in assigned tags on the first node and the step of controlling the physical resource that uses on the link of LSP process during the described LSP of foundation:

When setting the label space of link, select to use TE Link label space type, after the form of setting label space was also consulted to finish, link can be used to set up LSP;

After determining the attribute of the first and last node of LSP of required foundation and LSP, specify LSP to arrive each TE Link of end-node process and the mark value of using on the link at first node;

By the information that configures, use the signaling protocol of GMPLS to initiate to carry out the foundation of LSP at first node:

Each node is selected the well-determined resource that must use by the TE Link and the mark value in the TE Link label space of appointment in setting up the LSP process, carry out the foundation of LSP;

After first node finally received and handles successful response message and dispose, circular completed successfully by the LSP of the requirement foundation of appointment.

Preferably, described set up, safeguard and the process of deletion LSP in, different LSP is during through same link, the step of shared resource comprises step:

Set up article one LSP;

Set up the second LSP that wants the shared portion resource with described article one LSP as follows:

If on the common node of two LSP processes, it receives the inlet of data and same resource is all shared in the outlet of transmission data, that then uses on the common link of described two LSP processes goes into and goes out mark except " example " territory is different, other regional value is just the same, and two LSP share same interconnection;

If on the common node of two LSP processes, its inlet that receives data is shared same resource, go but need send to different outlets, then described two LSP go into mark except the difference of " example " territory on the link of common reception data, and other regional value is just the same; Two LSP on the link that sends data to go out mark separate, the corresponding separately Export resource that oneself will use; The mode of " broadcasting " is adopted in the interconnection of two LSP, and data are duplicated and sent in all outlets;

If on the common node of two LSP processes, it receives the inlet difference of data, but same resource is shared in the outlet that sends data, then described two LSP on the link that receives data to go into mark independent mutually, the corresponding separately inlet resource that oneself will receive data; Two LSP go out mark except the difference of " example " territory on the link of common transmission data, other regional value is just the same; The mode of " choosing is received " is adopted in the interconnection of two LSP, selects the good shared outlet that is forwarded to go the data-signal of difference inlet by predetermined rule.

Alternatively, if when setting up second LSP data on article one LSP and information are no longer needed, described foundation and described article one LSP want the step of the second LSP of shared portion resource to comprise step:

If on the common node of two LSP processes, it receives the inlet of data and same resource is all shared in the outlet of transmission data, then the resource on the link of corresponding reception and transmission data is used by second LSP, article one LSP is labeled as resource and discharges;

If on the common node of two LSP processes, its inlet that receives data is shared same resource, go but need send to different outlets, then the inlet resource of two LSP on the link of common reception data used by second LSP, and article one LSP is labeled as resource and discharges; The Export resource of two LSP on the link that sends data is separate, discharges the resource of article one LSP, the employed resource of application second LSP; Discharge the interconnection of article one LSP, set up second LSP interconnection;

If on the common node of two LSP processes, it receives the inlet difference of data, but sends the shared same resource of outlet of data, and then the inlet resource of two LSP on the link that receives data is independent mutually, discharge the resource of article one LSP, the employed resource of application second LSP; The Export resource of two LSP on the link of common reception data used by second LSP, and article one LSP is labeled as resource and discharges; Discharge the interconnection of article one LSP, set up second LSP interconnection.

Preferably, set up, safeguard and the process of deletion LSP in, different LSP is during through same link, the step of shared resource comprises the steps:

When deletion has the LSP of shared resource,

If on the node of this LSP process, it receives the inlet resource of data and the Export resource of transmission data is all shared with other LSP, does not then change other LSP taking resource; Directly the deletion of this LSP of mark is moved successfully;

If on the node of this LSP process, its inlet resource that receives data is shared, but Export resource do not have, and does not then change other LSP taking the inlet resource; Discharge the Export resource that this LSP takies; Delete the broadcast data forwarding that this LSP exports from entering the mouth to;

If on the node of this LSP process, its inlet resource that receives data is not shared, but the outlet that sends data is shared, and then discharges the inlet resource of this LSP; Do not change other LSP taking to Export resource; Cancellation is received the monitoring and the choosing of data-signal on the inlet of this LSP.

Preferably, the step of tag format comprises step in the described setting label space type and token space: if the label space type that the described TE Link of setting uses is described TE Link label space type, then described TE Link is specified unified tag format; If the label space type that the described TE Link of setting uses is described Member Link label space type, then each described Member Link of forming described TE Link is specified its tag format respectively.

Alternatively, the step of tag format comprises step in the described setting label space type and token space: form if TE Link is the Member Link with port exchange attribute, set the tag format of the port of link; Form if TE Link is the Member Link with wavelength exchange attribute, set the wavelength tag format of link; If TE Link is the link with Member Link composition of SDH or SONET time gas exchange attribute, set the time slot tag format of link.

Alternatively, describedly between the adjacent node type of the employed label space of described TE Link set and parameter thereof are carried out the step that label space consults comprise step in described network: utilize the label space configuration messages that the employed label space of described TE Link is carried out the label space parameter negotiation in the described network between the adjacent node, described label space configuration messages comprises flag parameters configuration messages and Member Link sign configuration messages.

Alternatively, utilize the label space configuration messages that the step that the employed label space of described TE Link carries out the label space parameter negotiation is comprised step in the described network between the adjacent node:

The label space type is the TE Link of described Member Link label space, utilizes the flag parameters configuration messages employed label space to be carried out the negotiation of corresponding relation of form, mark and resource of type, the mark of label space;

The label space type is the TE Link of described TE Link label space, at first utilize the flag parameters configuration messages employed label space to be carried out the negotiation of corresponding relation of form, mark and resource of type, the mark of label space, utilize Member Link sign configuration messages to carry out the negotiation of Member Link method for expressing in mark then.

Adopt following method with the physical resource correspondence of the mark on the TE Link on TE Link: for the described TE Link that uses TE Link label space type, mark in the label space has comprised the information of Member Link, the result who consults by member's link mark configuration messages corresponds to the Member Link that should use, again by being marked at corresponding employed resource on the Member Link.

Dispose the active and the passive attribute of adjacent node in the described network;

Active node sends the label space configuration messages;

Passive node receives the label space configuration messages that described active node sends;

Judge whether to accept the configuration parameter of the label space in the described label space configuration messages,

If can accept, then return one and just respond, and enable the label space of configuration,

If cannot accept, then return a Negative Acknowledgment, and the configuration parameter of which the described label space of explanation in the described label space configuration messages cannot be accepted in described Negative Acknowledgment, and to the recommended value of the configuration parameter of described label space.

Utilize the present invention; can in the GMPLS system, realize the flexible mapping of mark and real resource; solve mark and real resource in the prior art one to one the Different L SP that brings of regulation can not use the problem of same physical resource; can realize that building afterwards earlier of RSVP delete (make-before-break); and the trail protection of LSP, perhaps realize broadcasting service.Simultaneously, the negotiations process of the concrete form of defined label space and mark, allow two adjacent nodes that the concrete form and the implication of mark are consulted automatically and circulated a notice of, guarantee the consistency of both sides to the definition and the use of mark, avoid not having the mistake that may occur when human configuration is specified when consulting, can assist location of mistake and find mistake early; In path appointment or path computing process, can just accurately control at first node employed resource, no longer need the Member Link selection course, simplified the computational process in path; Utilize the present invention, can also when setting up LSP, realize control fully through used resource on the path.

Description of drawings

Fig. 1 is the tag format when link is optical port exchange link in the network described in the present invention;

Fig. 2 is the tag format when link is wavelength exchange link in the network described in the present invention;

Fig. 3 is the tag format when link is the time gas exchange link of SDH or SONET in the network described in the present invention;

Fig. 4 is the flow chart of the step of the preferred embodiments of the present invention method of realizing GMPLS (GMPLS) in network;

Fig. 5 be the present invention when realizing in network that carrying out label space in the method for GMPLS (GMPLS) in described network between the adjacent node consults relevant main/detail flowchart that passive attribute is set;

Fig. 6 is the form and the parameter of the flag parameters configuration messages in the configuration messages of label space described in the present invention;

Fig. 7 is the form and the parameter of the Member Link sign configuration messages in the configuration messages of label space described in the present invention;

Fig. 8 carries out label space to carry out that active node label space negotiation state changes schematic diagram in the step of label space configuration in consulting between adjacent node between the adjacent node in described network among the present invention shown in Figure 5;

Fig. 9 carries out label space to carry out that passive vertex ticks space negotiation state changes schematic diagram in the step of label space configuration in consulting between adjacent node between the adjacent node in described network among the present invention shown in Figure 5;

Figure 10 utilizes the mode that adopts broadcasting described in the present invention same shared Ingress node data in the network to be sent to the schematic diagram of the method realization multicast of different Egress nodes;

Figure 11 is that the method for utilizing described in the present invention the mode that adopts choosing to receive that same shared Egress node in the network is received different Ingress node data realizes that the make-before-break mode of the trail protection of LSP and resource reservation protocol (rsvp) sets up the schematic diagram of LSP.

Embodiment

The present invention is described in further detail below in conjunction with the drawings and specific embodiments:

At first the node in the network described in the present invention is done an explanation, node in the described network is the device node of optical transport network, comprise TDM (time division multiplexing) node, LSC (wavelength exchange) node, FSC (optical fiber exchange) node, Fig. 1, Fig. 2, Fig. 3 are respectively the different tag formats when optical port node, wavelength switching node, SDH node are used for different switching paths with the SONET node in the network described in the present invention:

With reference to Fig. 1, Fig. 1 be described in the present invention in the network optical port node be used for tag format on the link of optical fiber exchange, wherein 11 is the port-mark position of optical port node, represents which port; 12 is the instance identification position of optical port node, the not isolabeling that expression port one 1 need use when being shared by Different L SP.The total length of mark (comprising port-mark 11 and instance identification 12) is 32 bits.Port-mark 11 and instance identification 12 length separately can change, and occurrence can be 32 but should keep both sums by carrying out determining when mark is consulted with adjacent node.

With reference to Fig. 2, Fig. 2 is that the medium wavelength of network described in the present invention switching node is used for the tag format on the wavelength exchange link, and wherein 21 is the port-mark position of wavelength switching node, represents which port; 22 is the wavelength sign position of wavelength switching node, represents which wavelength; 23 is the instance identification position of wavelength switching node, the not isolabeling that expression port 21 need use when being shared by Different L SP.The total length of mark (comprising port-mark 21, wavelength sign 22 and instance identification 23) is 32 bits.Port-mark 21, wavelength sign 22 and instance identification 23 concrete variable-length separately can be 32 but should keep three's sum by carrying out determining when mark is consulted with adjacent node.

With reference to Fig. 3, Fig. 3 be described in the present invention in the network SDH node or SONET node be used for tag format on the time gas exchange link, wherein 31 is the port-mark position of SDH node or SONET node, represents which port; 32 is the wavelength sign position of SDH node or SONET node, represents which wavelength; 38 is the instance identification position of SDH node or SONET node, the not isolabeling that expression port 31 need use when being shared by Different L SP.

Wherein identify 33 to the sign 37 S, U, K, L, M be illustrated respectively in time slot position in the different multiplex modes of SDH/SONET.Specifically:

S:--is illustrated in which AUG-1/STS-3 among the STM-N/STS-N, the just position of AUG-1/STS-3.As the light mouth for STM-16/STS-48, this value can be 1--16.Wherein STM represents the Synchronous Transport Module level-N among the SDH, and STS represents the synchronous driving signal among the SONET.

U:--is illustrated in which VC-3/STS-1_SPE among the AUG-1/STS-3, and value is 1--3.Wherein, AUG represents administrative unit groups, and VC (virtual container) is a kind of message structure in order to support that channel layer connects in the SDH net.STS-1_SPE is a kind of payload structure among the SONET, is equivalent to the VC-3 among the SDH.

K:--should be worth only effective to the SDH interface.If AUG-1 is made up of a VC-4 rather than three VC-3, which TUG-3 among this value representation VC-4, value 1--3.Wherein, TUG represents the tributary unit group.

L:--is illustrated in which TUG-2/VT-Group among TUG-3 (or VC-3)/STS-1_SPE.A TUG-3 (or VC-3)/STS-1_SPE can be made up of 7 TUG-2/VT-Group, L value 1--7.Wherein, VT-Group represents empty branch road group, is the division of among the SONET the inner payload structure of a STS-1 being carried out.

M:--is to the VT-Group of SONET, can be by 4 VT1.5_SPE, and perhaps 3 VT2_SPE, perhaps 2 VT3_SPE form, to the TUG-2 of SDH, can be by 4 VC11, perhaps 3 VC12 form.During M value 1--2, indication is which VT3_SPE among the VT-Group; During M value 3--5, indication is which VT2_SPE/VC12 among the VT-Group/TUG-2; During M value 6--9, indication is which VT1.5_SPE/VC11 among the VT-Group/TUG-2.

In the mark, the territory that need not use puts 0 without exception.

Wherein the total length of mark (comprising each above-mentioned territory) is 32 bits, or uses 64 bits when not enough.Wherein the concrete variable-length of each identification field by carrying out determining when mark is consulted with adjacent node, is total up to 32 or 64 bits but should keep.

With reference to Fig. 4, Fig. 4 is the flow process of the step of the preferred embodiments of the present invention method of realizing Multi-Protocol Label Switch (MPLS) in network:

At first set the tag format in the employed label space type of each TE Link and label space in the described network in step 41, described TE Link can be that actual a plurality of physical links are or/and a LSP who has set up according to the needs of switching path in the network, each physical link in the described TE Link is a Member Link, and the employed label space type of described TE Link comprises TE Link label space and Member Link label space;

Then, enter step 42, the negotiations process of usage flag space is carried out label space and is consulted between link-attached two adjacent nodes, between adjacent node, carry out the label space negotiations process, the type of label space, tag format, mark are held consultation and circulated a notice of to mapping relations of concrete physical resource etc.Fig. 5 has described the artis master in this step/by the detailed process of attribute aspect; Fig. 6 has then described the process that usage flag spatial configuration message in this step is carried out concrete label space parameter negotiation to Fig. 9, comprises the content of label space configuration messages, the detailed action in the negotiations process;

Refer again to Fig. 4, after carrying out the label space negotiation between the adjacent node, enter step 43, judge whether described label space negotiation is passed through;

Do not pass through if consult, enter step 45, the change Link State can not be used to set up label switched path (LSP) with the resource that identifies on this link, show the configuration error of described adjacent node about the attribute of described TE Link, enter step 46 then, revise configuration, return step 42 then according to the prompting of negotiation result, restart negotiations process

If consult to pass through, enter step 44, the change Link State can be used to set up LSP with the resource that identifies on this link;

Enter step 47 then, after on TE Link, using TE Link label space type and setting tag format in the label space, when setting up LSP in assigned tags on the first node and control the physical resource that uses on the link of LSP process;

Enter step 48 then, set up, safeguard and the process of deletion LSP in, different LSP is during through same link, shared resource.

Spoken of Fig. 5 above and described step 42 among Fig. 4, between adjacent node, carried out the detailed process that relevant master/passive attribute was set when label space was consulted, this flow process has been elaborated below with reference to Fig. 5:

At first enter step 51, when adopting control channel configuration in the LMP agreement to the setting of the master/passive attribute of adjacent two nodes;

Enter step 52 then, the judgement master/by property value,

If passive node then enters step 54, wait for the label space configuration messages that the other side sends,

Then, enter step 59, receive the message that the other side sends,

Enter step 510 again, judge whether the message that receives is the label space configuration messages,

If, then enter step 511, carry out normal label space layoutprocedure,

If not, illustrate to receive message error, enter step 57, ban use of the link that is connected to this node;

If active node enters step 53, outwards send out the label space configuration messages, and wait for the other side's response,

Enter step 55, receive the message that the other side sends,

Then, enter step 56, judge whether the message that receives is the label space configuration messages, if illustrate that two nodes all are active node now, the LMP agreement of carrying out previously

The control channel layoutprocedure wrong, enter step 57, ban use of the link that is connected to this node.

If not, enter step 58, judge further whether the message of receiving is the other side's response message,

If, illustrate lead/to be provided with normally by attribute, enter step 511, carry out normal label space layoutprocedure,

If not, illustrate to receive message error, enter step 57, ban use of the link that is connected to this node.

Above described two nodes carry out in the normal label space layoutprocedure, two nodes need be held consultation to concrete parameter such as label space type, tag format, mark value.For Member Link label space type, only need the tag format in the negotiation label space, adopt the flag parameters configuration messages just passable.When using such link, still need to introduce the process that a Member Link is selected, but can check the configuration of mark both sides between two nodes, strengthened the ability of misarrangement.

For TE Link label space type, not only want the label physique formula in the configuration flag space, also to circulate a notice of mutually and consult the expression value of Member Link in mark, so the label space configuration messages has two, be expressed as flag parameters configuration messages and Member Link sign configuration messages respectively, carry out the configuration of the tag format in the label space and the configuration that Member Link is represented respectively in mark.

The positive response message of configuration that passive node returns when accepting configuration data in the configuration messages, the configuration Negative Acknowledgment message of returning when refusing the configuration data in the configuration messages.Every kind of response message also has two respectively, and expression is to which the response of two label space configuration messages respectively.Fig. 6 and Fig. 7 have represented the form and the parameter of these two configuration messages respectively.

With reference to Fig. 6, Fig. 6 is the form and the parameter of the flag parameters configuration messages in the configuration messages of label space described in the present invention, and wherein each parameter is expressed as follows respectively:

The Member Link interface IP address of field 61 expression node correspondences;

Field 62 expressive notation space types, differentiation are Member Link label space and TE Link label space;

Field 63 expressive notation total lengths are unit with the byte;

Field 64 expression port-mark length, bitwise;

Field 65 expression wavelength sign length, bitwise;

Field 66 expression wavelength mapping relations, be divided into forward and reverse two kinds, wherein the wavelength mapping relations of forward are meant the minimum value of minimum value 1 corresponding wavelength of wavelength sign length 65, reverse wavelength mapping relations are meant the maximum of minimum value 1 corresponding wavelength of wavelength sign length 65, if wavelength sign length 65 is 0, receiving node should be ignored the wavelength mapping relations so, and sending node puts 0 with the wavelength mapping relations when sending;

Field 67 expression S length of fields, the implication of S representative is with the S among Fig. 3, bitwise;

Field 68 expression U length of fields, the implication of U representative is with the U among Fig. 3, bitwise;

Field 69 expression K length of fields, the implication of K representative is with the K among Fig. 3, bitwise;

Field 610 expression L length of fields, the implication of L representative is with the L among Fig. 3, bitwise;

Field 611 expression M length of fields, the implication of M representative is with the M among Fig. 3, bitwise;

Field 612 expression example domains length bitwise, if be 0, illustrate and do not support to use resource-sharing on this links.

Wherein, if the type of LI(link interface) address 61 link corresponding (Member Link or TE Link) is inconsistent with the label space type 62 in the corresponding message, the passive node that then receives message is refused this message, and return label space type mistake;

If the type of LI(link interface) address 61 link corresponding and the label space type 62 in the corresponding message all are Member Links, port-mark length 64 is necessary for 0 so, be not that the passive node that received message at 0 o'clock is refused this message, and return label space type mistake;

With reference to Fig. 7, Fig. 7 is the form and the parameter of the Member Link sign configuration messages in the configuration messages of label space described in the present invention, and wherein each parameter is expressed as follows respectively:

The TE Link interface IP address of field 71 expression node correspondences;

The Member Link interface IP address and the corresponding label space middle port ident value of field 72 expression node correspondences.

Wherein, the Member Link interface IP address represents to belong to a member in the TE Link in the field 72; Port-mark value in the corresponding label space will be in Member Link label space configuration messages shown in Figure 6 can be represented in the scope of the port-mark length 64 of appointment, and the label space middle port ident value of each Member Link correspondence has nothing in common with each other, and can distinguish.

Fig. 8 and Fig. 9 have described respectively and carried out label space carries out active node and passive node node state in the label space negotiations process in the step of label space configuration in consulting between adjacent node variation among the present invention shown in Figure 5 between the adjacent node in described networks.

With reference to Fig. 8, as shown in FIG., active node node in the label space negotiations process has four kinds of states, is expressed as follows respectively:

The initial condition of state 801 expression active node when beginning to consult;

State 802 expression active node are sent the state behind the flag parameters configuration messages;

State 803 expression active node are sent the state behind the Member Link sign configuration messages;

The state of state 804 expression active node after consulting successfully.

In the label space negotiations process, the message that active node sends and receives is expressed as follows respectively:

Message 81 expression active node begin to hold consultation.Only when state 801 this incident be only legal.After receiving this incident, carry out action actA, get the hang of 802;

Message 82 expression active node are received the refusal response of passive node to the flag parameters configuration messages, and can't consult, and wait for that perhaps the other side's node returns response timeout.Only when state 802 this incident be only legal.After receiving this incident, carry out action actD, state turns back to state 801;

Message 83 expression active node are received the refusal response of passive node to the flag parameters configuration messages, and are negotiable, have comprised the recommended value of the other side to negotiable parameter in the response of returning.Only when state 802 this incident be only legal.After receiving this incident, carry out action actE, state remains unchanged, and still remains on state 802;

Message 84 expression active node are received the just response of passive node to the affirmation success of Member Link sign configuration messages.Only when state 802 this incident be only legal.After receiving this incident,, get the hang of 803 if TE Link label space type is carried out action actB; If Member Link label space type is carried out action actC, directly get the hang of 804;

Message 85 expression active node are received the refusal response of passive node to Member Link sign configuration messages, and can't consult, and wait for that perhaps the other side's node returns response timeout.Only when state 803 this incident be only legal.After receiving this incident, carry out action actD, state turns back to state 801;

Message 86 expression active node are received the refusal response of passive node to Member Link sign configuration messages, and are negotiable, have comprised the recommended value of the other side to negotiable parameter in the response of returning.

Only when state 803 this incident be only legal.After receiving this incident, carry out action actF, state remains unchanged, and still remains on state 803;

Message 87 expression active node are received the just response of passive node to the affirmation success of Member Link sign configuration messages.Only when state 803 this incident be only legal.After receiving this incident, carry out action actB, state remains unchanged;

Message 88 expression active node are received the just response of passive node to the affirmation success of Member Link sign configuration messages, and response is the message of last Member Link sign configuration messages.Only when state 803 this incident be only legal.After receiving this incident, carry out action actC, enter state 804.

The action that above-mentioned active node is carried out in the label space negotiations process is respectively described below:

ActA: active node sends out the flag parameters configuration messages by configuration parameter to peer node;

ActB: active node sends out Member Link sign configuration messages by configuration parameter to peer node;

ActC: identify this label space for enabling, can be for distributing and usage flag, that is to say can be for distributing and use link corresponding resource;

ActD: record report error reason and data;

ActE: active node recomputates new data according to the recommended value of the opposite end of consulting to receive, uses new data to send the flag parameters configuration messages to the opposite end;

ActF: active node recomputates new data according to the recommended value of the opposite end of consulting to receive, uses new data to send Member Link sign configuration messages to the opposite end;

Refer again to Fig. 9, as shown in FIG., passive node node in the label space negotiations process has three kinds of states, is expressed as follows respectively:

The initial condition of the state 901 passive nodes of expression when beginning to consult;

The passive node of state 902 expressions is received the flag parameters configuration messages, and handles successfully the state behind the acceptance configuration data wherein;

The state of the state 903 passive nodes of expression after consulting successfully.

In the label space negotiations process, the message that passive node sends and receives is expressed as follows respectively:

The passive node of message 91 expression receives that parameter can't be accepted maybe can't consult in the other side's the flag parameters configuration messages.Only when state 901 this incident be only legal.After receiving this incident, carry out action actI, state remains unchanged;

The passive node of message 92 expressions is received the other side's flag parameters configuration messages, and the parameter in the message need be held consultation.Only when state 901 this incident be only legal.After receiving this incident, carry out action actH, state remains unchanged;

The passive node of message 93 expressions is received the other side's flag parameters configuration messages, and accepts the other side's configuration data.Only at state 901 and when being passive node this incident be only legal.After receiving this incident,, enter state 902 if TE Link label space type is carried out action actG; If the Member Link space type is carried out action actJ, directly get the hang of 903;

The passive node of message 94 expression receives that parameter can't be accepted maybe can't consult in the other side's the Member Link sign configuration messages.Only when state 902 this incident be only legal.After receiving this incident, carry out action actI, state return state 901;

The passive node of message 95 expressions is received the other side's Member Link sign configuration messages, and accepts the other side's configuration data.Only when state 902 this incident be only legal.After receiving this incident, carry out action actG, state remains unchanged;

The passive node of message 96 expressions is received the other side's Member Link sign configuration messages, and the parameter in the message need be held consultation.Only when state 902 this incident be only legal.After receiving this incident, carry out action actH, state remains unchanged;

The passive node of message 97 expressions is received the other side's Member Link sign configuration messages, and accepts the other side's configuration data, and this message is last.Only when state 902 this incident be only legal.After receiving this incident, carry out action actJ, enter state 903;

The action that above-mentioned passive node is carried out in the label space negotiations process is respectively described below:

ActG: passive node returns the positive response message of the configuration messages of receiving to the opposite end;

ActH: passive node returns the Negative Acknowledgment message of the configuration messages of receiving to the opposite end, and returns the recommended value of negotiable parameter;

ActI: passive node returns the Negative Acknowledgment message of the configuration messages of receiving to the opposite end, and returns error reason and unacceptable parameter.

ActJ: passive node returns the positive response message of the configuration messages of receiving to the opposite end, and label space is enabled simultaneously, can be for distributing and usage flag, and that is to say and distribute and use the link corresponding resource

In the present invention, adopt foregoing tag format and label space, allow to represent same resource with different marks, such as, port, wavelength, time slot can realize that resource is shared on different LSP.Processing method to Different L SP resource-sharing:, in the time of sending to different outlets, adopt the mode (each outlet copy is a) of broadcast replication with a inlet resource of sharing (as port, wavelength, time slot); With a Export resource of sharing, in the time of receiving the data of different inlets, the mode that adopts choosing to receive only receives outlet with an inlet resource according to different rule (as the quality of signal).The processing method of this shared resource can be applied to the trail protection of multicast, LSP, the make-before-break mode of RSVP is set up the process of LSP.

With reference to Figure 10, Figure 10 utilizes the mode that adopts broadcasting described in the present invention same shared Ingress node data in the network to be sent to the schematic diagram of the method realization multicast of different Egress nodes:

Source node will be multicasted to a business different destination node (destination node 1 and destination node 2) and get on.Source node and each destination node are all set up a label switched path (LSP1 and LSP2), and they are set up with sharing mode, promptly can shared resource.Walk on the same link when (source node is between node of divergence) as LSP like this to the various objectives node, they just can shared a physical resource (different LSP, use identical time slot, the example difference in the mark only), in the time of need walking different paths (node of divergence to destination node 1 and node of divergence to destination node 2), on node of divergence, duplicate again and distribute.Improved utilization rate of network resource.

In the above in the method for the realization multicast shown in Figure 10 of Miao Shuing, the also mode that can broadcast, but adopt other method to realize, no matter which kind of method realizes the shared processing with a physical resource of this Different L SP, do not break away from spirit of the present invention.

With reference to Figure 11, Figure 11 utilizes the method that adopts broadcasting and choosing to receive described in the present invention to set up the schematic diagram of LSP in conjunction with the make-before-break mode of the trail protection of realizing LSP and RSVP:

When being used for trail protection, two LSP set up well earlier, and business datum is to send to simultaneously among two LSP on node of divergence.On merge node, the service signal quality of coming on two LSP is monitored, select that matter is measured delivers to outlet.The protection of 1+1 can be provided a business between bifurcated and merge node like this.

Make-before-break is the special method of setting up LSP that the RSVP signaling protocol can be realized.When the business datum on the LSP is impaired need build one in addition for these business datums the time, or, can use this method to reach optimum efficiency because the variation of network topology causes that the path of LSP process need adjust when optimizing network utilization.

The basic process of make-before-break is as follows: source node is newly set up a LSP, and allows it and original LSP shared resource.After foundation finishes, business datum is switched to new LSP go up transmission, delete original LSP.Since earlier the new LSP that sets up with after the LSP that will delete allow shared resource, can improve utilization rate of network resource, reduce resource requirement, also reduced the fluctuation range of topological sum link flow engineering attribute information in the network simultaneously, reduced the demand of routing iinformation diffusion.

In optical-fiber network, need walk on the node of divergence in different paths at two LSP, be with duplicating and two modes of sending out, business datum all being sent out two outlets simultaneously equally when setting up new LSP.On the merge node of two LSP, can select the inlet of a LSP according to the situation of service signal quality state and two LSP, its business is dealt into outlet gets on.If old LSP service signal has damaged, can when setting up new LSP, directly select the port service of going into of receiving new LSP; If new LSP sets up the old LSP of back this section point discovery that finishes and goes up service signal and damaged, can switch the business that choosing receives when damaging be new LSP; New LSP will delete old LSP after setting up and finishing, and deletion is received on the node in choosing and must earlier the business choosing be received deletion again on the new LSP the duplicating and distribute of business on node of divergence.

When the different inlet resource among described Figure 11 will receive and be forwarded in the same outlet, can select receipts in the above according to different rules, such as, according to the time of signal foundation or according to quality of signals.No matter adopt which kind of rule to realize the shared processing of this Different L SP, do not break away from spirit of the present invention with a physical resource.

Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and for example, in the mark method for expressing that is proposed among the present invention, concrete presentation format can have different modes; The LMP agreement can not be used in the mark negotiations process, and uses other agreement to carry out, and in addition, negotiations process also can change, if can make both sides can to the various parameters of label space and with concrete physical resource corresponding checking the how, reach an agreement.Wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.

Claims

1. method that in network, realizes GMPLS, described network comprises Optical Transmission Network OTN, it is characterized in that, described method comprises step:

Set in the described network the concrete format parameter of mark in the employed label space type of each traffic engineering TE link and label space;

The label space negotiation is carried out in the negotiations process of usage flag space between link-attached two adjacent nodes, and enables automatically after consulting successfully and set the TE Link that finishes;

In setting up label switched path LSP process, in assigned tags on the first node and control the physical resource that uses on the link of LSP process;

2. the method that realizes GMPLS in network as claimed in claim 1 is characterized in that the tag format in employed label space type of described setting TE Link and the label space comprises step:

Set the employed label space type of each TE Link of each node in the described network, described node comprises optical port, wavelength switching node, SDH (Synchronous Digital Hierarchy) SDH node and Synchronous Optical Network SONET node, and the employed label space type of described TE Link comprises TE Link label space and Member Link label space;

3. the method that realizes GMPLS in network as claimed in claim 1 is characterized in that, the space negotiations process of described usage flag is carried out label space and consulted to comprise step between link-attached two adjacent nodes:

Judge whether described label space negotiation is passed through,

If described negotiation is not passed through, the change Link State can not be used to set up LSP with the resource that identifies on this link, show the configuration error of described adjacent node, restart negotiations process after the prompting modification configuration according to negotiation result about the attribute of described TE Link

4. the method that realizes GMPLS in network as claimed in claim 1 is characterized in that, comprises step in assigned tags on the first node and the step of controlling the physical resource that uses on the link of LSP process during the described LSP of foundation:

By the information that configures, use the signaling protocol of GMPLS GMPLS to initiate to carry out the foundation of LSP at first node;

5. the method that realizes GMPLS in network as claimed in claim 1 is characterized in that, described set up, safeguard and the process of deletion LSP in, different LSP is during through same link, the step of shared resource comprises step:

Set up article one LSP;

6. the method that in network, realizes GMPLS as claimed in claim 5, it is characterized in that, if when setting up second LSP data on article one LSP and information are no longer needed, described foundation and described article one LSP want the step of the second LSP of shared portion resource to comprise step:

7. the method that realizes GMPLS in network as claimed in claim 1 is characterized in that, set up, safeguard and the process of deletion LSP in, different LSP is during through same link, the step of shared resource comprises the steps:

When deletion has the LSP of shared resource,

8. the method that in network, realizes GMPLS as claimed in claim 2, it is characterized in that, the step of tag format comprises step in the described setting label space type and token space: if the label space type that the described TE Link of setting uses is described TE Link label space type, then described TE Link is specified unified tag format; If the label space type that the described TE Link of setting uses is described Member Link label space type, then each described Member Link of forming described TE Link is specified its tag format respectively.

9. the method that in network, realizes GMPLS as claimed in claim 2, it is characterized in that, the step of tag format comprises step in the described setting label space type and token space: form if TE Link is the Member Link with port exchange attribute, set the tag format of the port of link; Form if TE Link is the Member Link with wavelength exchange attribute, set the wavelength tag format of link; If TE Link is the link with Member Link composition of SDH or SONET time gas exchange attribute, set the time slot tag format of link.

10. the method that in network, realizes GMPLS as claimed in claim 3, it is characterized in that, describedly between the adjacent node type of the employed label space of described TE Link set and parameter thereof are carried out the step that label space consults comprise step in described network: utilize the label space configuration messages that the employed label space of described TE Link is carried out the label space parameter negotiation in the described network between the adjacent node, described label space configuration messages comprises flag parameters configuration messages and Member Link sign configuration messages.

11. the method that in network, realizes GMPLS as claimed in claim 10, it is characterized in that, utilize the label space configuration messages that the step that the employed label space of described TE Link carries out the label space parameter negotiation is comprised step in the described network between the adjacent node:

12. the method that realizes GMPLS in network as claimed in claim 4 is characterized in that, comprises step in assigned tags on the first node and the step of controlling the physical resource that uses on the link of LSP process during the described LSP of foundation:

13. the method that in network, realizes GMPLS as claimed in claim 10, it is characterized in that, utilize the label space configuration messages that the step that the employed label space of described TE Link carries out the label space parameter negotiation is comprised step in the described network between the adjacent node:

Active node sends the label space configuration messages;