CN101835066A - Label switched path (LSP) processing method based on link bundle - Google Patents

Abstract

The invention discloses a label switched path (LSP) processing method based on a link bundle, comprising the following steps: determining one or more bundled links and one or more non-bundled links which are passed through by an LSP through a route calculation and wavelength allocation entity; selecting member links from each bundled link by the route calculation and wavelength allocation entity according to a first preset strategy; and determining wavelengths of each selected member link and each non-bundled link used for transmission in the LSP and wavelengths of nodes which are passed through by the LSP through the route calculation and wavelength allocation entity according to a second preset strategy. By virtue of the invention, a scheme for realizing LSP establishing process in the bundled link technology is provided, thus filling in gaps in the prior art.

Description

Tag changeable path path processing method based on link bundle

Technical field

The invention belongs to the optical-fiber network transmission field, relate to wavelength switched optical network (WavelengthSwitch Optical Network, abbreviating WSON as) lining is based on the tag changeable path path processing method of link bundle, relates in particular to the tag changeable path path processing method based on link bundle.

Background technology

In wavelength switched optical network, may there be multilink between a pair of node, demand based on the route extensibility, may need this multilink as a traffic engineering (Traffic Engineering independently, abbreviating TE as) link is flooded to ospf (Open Shortest Path First, abbreviate OSPF as) or the routing protocol (Intermediate System to Intermediate SystemRouting Protocol abbreviates IS-IS as) of Intermediate System-to-Intermediate System in.And, in the standard RFC4201 of IETF, describe corresponding realization mechanism and introduced the notion of harness link (bundled link), after using the link bundle technology, the flow parameter information that the harness link is relevant just can be by inundation, but the information relevant with Member Link (component link) but can be by inundation, and, regulation according to RFC4201, OSPF-TE (OpenShortest Path First Traffic Engineering that can the expansion bands traffic engineering, abbreviate OSPF as) and based on the RSVP (Resource Reserve Protocol TrafficEngineering abbreviates RSVP-TE as) of traffic engineering expansion.

If a wavelength division multiplexing (Wavelength Division Multiplexing abbreviates WDM as) node has the ability of wavelength Conversion, that is, wavelength can be switched to another wavelength on the different directions.But under a limited number of situations of wavelength shifter, be not that every wavelength of every optical fiber can both be switched on any other wavelength on other optical fiber arbitrarily, so the constraint of wavelength conversion capability directly has influence on wavelength connectedness potential in the wavelength switched optical network.

Generally, an optical fiber the wavelength that can support be pre-configured, and be static attribute information, these attribute informations are changed need be by the method for HardwareUpgring.For every optical fiber, common only needs are once pre-configured or through route protocol flooding once, because network is when moving, the wavelength of optical fiber support does not need often to be changed.

If the node that execution route calculates is not known the available information of wavelength (yet can be described as label), can only calculate at the level execution route of TE Link, and coordinate the selection (just adopting distributed Wavelength Assignment mechanism) of wavelength by signaling protocol mechanism, unless some node is the long conversion of all-wave on the optical channel, otherwise can cause treatment effeciency lower, and cause higher obstruction.Generally, limited or do not have under the situation of wavelength conversion capability in wavelength conversion capability, the available information of wavelength calculates particularly important for carrying out wavelength channel effectively, accurately.Because the path computing entity also needs to know connectivity constraint information, wavelength conversion capability constraint information and the wavelength Conversion available information of WDM intranodal, so wavelength channel need be considered five factors when calculating: constraint of node wave length transfer capability and wavelength Conversion available information, node wave length connectivity constraint information, every optical fiber wavelength available information and wavelength constraint information.

The Internet engineering duty group (Internet Engineering Task Force, abbreviate IETF as) general controls and management plane (Common Control and MeasurementPlane, abbreviating CCAMP as) the draft draft-ietf-ccamp-rwa-info of working group expands route agreement (OSPF-TE), make and carry out route and Wavelength Assignment (RoutingWavelength Assignment, abbreviating RWA as) entity (for example path-calculating element (PathComputation Element abbreviates PCE as)) can know the wavelength constraint information of the whole network TE Link, wavelength available information, the connectivity constraint of node, wavelength conversion capability constraint and wavelength Conversion available information.

But after the link bundle technology was applied to wavelength switched optical network, the wavelength constraint information and the wavelength available information of link will be hidden, and can't satisfy the demand that the entity of carrying out RWA requires to know the whole network TE Link wavelength constraint information and wavelength available information.Unless, carry out the entity of RWA and can collect these information.

In wavelength switched optical network, we handle wavelength as label, are not from the client layer angle, make TE Link or Member Link wavelength is seen.

After TE Link among the WSON carried out harness, the draft draft-ietf-mpls-explicit-resource-control-bundle of MPLS working group according to IETF, can be to RFC3209, the expansion of RFC3471 and RFC3473 and use, at this moment, can be by explicit route object (the Explicit Route Object after the expansion, abbreviate ERO as) subobject, explicitly appointment＜harness link, Member Link, label (wavelength) 〉.

If adopt distributed Wavelength Assignment and distributed Member Link to select, each node that just needs to connect is selected Member Link and wavelength.Certainly, we can come explicit specify labels (wavelength) by draft ERO object, set up in the process in connection, and each node is responsible for Member Link and is selected." 4.1Processing ofComponent Interface Identifier ERO Subobject " chapters and sections of draft draft-ietf-mpls-explicit-resource-control-bundle provide the principle of utilizing label and Member Link to carry out the explicit control of resource simultaneously.As can be seen, do not having under wavelength conversion capability or the wavelength conversion capability condition of limited, the connection of adopting distributed wavelength to distribute is set up process and can be produced bigger obstruction.

According to the RFC4201 regulation, after using the link bundle technology, to have only the harness link to can be used as TE Link and in Routing Protocol, flood, the information of Member Link does not flood in Routing Protocol.In order to solve the wavelength Conversion restricted problem in the wavelength switched optical network, regulation in the existing WSON draft (for example draft-ietf-ccamp-rwa-info) of the CCAMP working group of IETF:, the wavelength constraint information and the wavelength available information of link are carried out inundation by expansion Routing Protocol (OSPF-TE) (for example RFC3630).But, used the link bundle technology after, the harness link information inundation that this method and RFC4201 mention requires contradiction.That is, the entity of carrying out RWA will be known the wavelength constraint information and the wavelength available information of TE Link, still, after using the link bundle technology, the wavelength constraint information and the wavelength available information of TE Link can be hidden, and Here it is after using the link bundle technology in the wavelength switched optical network, the problem of existence.Like this, in the harness link technology, in the existing technical scheme for how to obtain these information that are hidden and realize in the wavelength switched optical network not providing concrete solution based on the process of setting up of the LSP of link bundle technology.

Summary of the invention

Consider exist in the correlation technique in the harness link technology, how to realize LSP the process of setting up problem and the present invention is proposed, for this reason, main purpose of the present invention is to provide the tag changeable path path processing method of a kind of wavelength switched optical network (WSON) lining based on link bundle, to address the above problem.

According to an aspect of the present invention, provide a kind of tag changeable path path processing method based on link bundle.

Tag changeable path path processing method based on link bundle according to the present invention comprises: route is calculated and the Wavelength Assignment entity determine LSP via one or more harness links and unbunding link; Route calculating and Wavelength Assignment entity are selected Member Link according to first predetermined policy from each harness link; Route calculate and the Wavelength Assignment entity according to second predetermined policy, determine that selected Member Link and unbunding link are used to the wavelength that transmits and the employed wavelength Conversion of node of definite LSP process in LSP.

And, this method also comprises: route is calculated and the Wavelength Assignment entity is known the link bundle information that is used to support route calculating and Wavelength Assignment in all harness links in advance, wherein, link bundle information comprises: the wavelength constraint information of harness link, the wavelength available information of harness link.

And, route calculating and Wavelength Assignment entity obtain the wavelength constraint information of harness link by the wavelength constraint information that calculates all Member Links in the harness link, wherein, the wavelength constraint information of harness link is meant: the union of all wavelengths constraint information that all Member Links in the harness link are supported.

Particularly, route calculating and Wavelength Assignment entity can obtain the wavelength available information of harness link by the wavelength available information that calculates all Member Links in the harness link, wherein, the wavelength available information of harness link is meant: the union of all the Member Link wavelength availables in the harness link; And, but when a wavelength in equal time spent of a plurality of Member Links of harness link, this wavelength useful number is that this wavelength of a plurality of Member Links can be with the summation of number in the harness link.

Wherein, in label switched path foundation and demolishing process, this label switched path the wavelength available supported of the Member Link in the harness link of process when occupied, with occupied wavelength from all wavelength availables and concentrate and to remove, and make corresponding wavelength in the harness link can reduce the number of occupied wavelength with number; Under the situation that finishes to take at occupied wavelength, add the wavelength that finishes to take to all wavelengths and concentrate, and make corresponding wavelength in the harness link increase the number that finishes the wavelength that takies with number; And, when the wavelength available information of the Member Link in the harness link changes, recomputate the wavelength available information of harness link, and inundation result of calculation, wherein, result of calculation is the union of all Member Link wavelength available informations.

In addition, when the Member Link wavelength constraint information in the harness link changed, this method also comprised: recomputate the wavelength constraint information of harness link, wherein, result calculated remains the union of all Member Link wavelength constraint informations; The wavelength constraint information that inundation recomputates.

In addition, in the method, also need link bundle information is carried out inundation, if this link bundle information changes, the link bundle information after inundation changes again.

In the method, know and be used to support route to calculate in all harness links and the mode of the link bundle information of Wavelength Assignment comprises one of following: the link bundle information that route calculating and Wavelength Assignment entity obtain by pre-configured mode; Or each node will link bundle information separately sends to route and calculates and the Wavelength Assignment entity, and wherein, when link bundle information changed, each node reconfigured or send the link bundle information after the variation.

This method also can comprise: route calculating and Wavelength Assignment entity are known the parameter information of all Member Links in advance, wherein, parameter information comprises: wavelength constraint information and wavelength available information that all Member Links that each harness link comprises, each Member Link are supported.

Wherein, route calculating and Wavelength Assignment entity obtain the parameter information of each node in advance, here, parameter information comprise following one of at least: each harness link of intranodal and connectivity constraint information, wavelength conversion capability constraint information, the wavelength Conversion available information between other harness links; Connectivity constraint information between each harness link and the unbunding link, wavelength conversion capability constraint information, wavelength Conversion available information; Connectivity constraint information between the intranodal unbunding link, wavelength conversion capability constraint information, wavelength Conversion available information.

Wherein, the parameter information that obtains each node comprises: route calculate and the Wavelength Assignment entity by calculate in the harness link between all Member Links and unbunding link and and other harness links in Member Link between connectivity constraint information, wavelength conversion capability constraint information, wavelength Conversion available information, obtain between harness link and other harness links and and the unbunding link between connectivity constraint information, wavelength conversion capability constraint information, wavelength Conversion available information; Wherein, the connectivity constraint information between harness link and the unbunding link, wavelength conversion capability constraint information and wavelength Conversion available information are the unions of connectivity constraint information, wavelength conversion capability constraint information and the wavelength Conversion available information between all Member Links and this unbunding link in this harness link; Connectivity constraint information between the harness link, wavelength conversion capability constraint information and wavelength Conversion available information are the unions of the connectivity constraint information between all Member Links, wavelength conversion capability constraint information and wavelength Conversion available information in these harness links; And, two wavelength to many Member Links and other links in the harness link (comprising the Member Link in other unbunding links and other harness links) but between wavelength Conversion time spent all, this wavelength is to being that wavelength Conversion can be with the summation of number between all Member Links and other links (comprising the Member Link in other unbunding links and other harness links) in this harness link in the wavelength Conversion useful number between harness link and other links (comprising other unbunding links and harness link).

Wherein, route calculating and Wavelength Assignment entity obtain the parameter information of each node, route calculating and Wavelength Assignment entity can also obtain the parameter information of node by pre-configured mode, also can be each node send to route with the parameter of node calculates and the Wavelength Assignment entity, and the parameter information of node must be able to be configured or be sent out when changing again.

Particularly, this method also can comprise: the wavelength available transfer capability between the Member Link in the harness link and other links (comprising Member Link and other unbunding link in other harness link) occupied or discharge after, wavelength available transfer capability information between corresponding harness link and other links (comprising other harness link and other unbunding link) must be calculated again, result of calculation remains the union of the wavelength Conversion available information of all Member Links and other links in the harness link (comprising the Member Link in other unbunding links and other harness links), and need be broadcasted again.

Preferably, above-mentioned first predetermined policy can comprise one of following: select Member Link in the harness link at random; All available Member Links in the harness link are sorted according to pre-defined rule, select the Member Link in precalculated position, ordering back; According to the number of times that Member Link in the harness link was used, from available Member Link, select to be used the maximum Member Link of number of times; From the harness link, select Member Link according to offered load.

Preferably, above-mentioned second predetermined policy can comprise one of following: select at random in the wavelength available of Member Link; All wavelength availables to Member Link sort according to pre-defined rule, select the wavelength in precalculated position, ordering back; According to the number of times that the Member Link medium wavelength was used, from wavelength available, select to be used the maximum wavelength of number of times; Select from the wavelength available of Member Link according to offered load.

By above-mentioned at least one technical scheme of the present invention, provide and realized that in the harness link technology LSP sets up the scheme of process, filled up the blank of prior art.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the flow chart based on the tag changeable path path processing method of link bundle according to the embodiment of the invention;

Fig. 2 is the scene schematic diagram according to the WDM node of the embodiment of the invention;

Fig. 3 is the schematic diagram of draft draft-ietf-ccamp-rwa-info to the expansion of route agreement (OSPF-TE/IS-IS);

Fig. 4 be in the prior art RFC4201 to the schematic diagram of the regulation of the flow parameter of harness link;

Fig. 5 is the schematic diagram of the route extended method of the embodiment of the invention;

Fig. 6 is the form schematic diagram according to the wavelength available information of the harness link of the embodiment of the invention;

Fig. 7 is a WSON topology of networks schematic diagram that uses the link bundle technology;

Fig. 8 is with wavelength constraint information and wavelength available information during as the flow parameter of harness link, the WSON topology of networks schematic diagram that route is calculated and the Wavelength Assignment entity is known;

Fig. 9 is the schematic diagram that the label switched path signaling of distribution of employing distributed wavelength and the selection of distributed Member Link is set up process.

Embodiment

Functional overview

In wavelength switched optical network, introduce after the harness link technology, the process of setting up for label switched path (LSP), do not provide the scheme of concrete solution, and, for adopting distributed Wavelength Assignment, selection and wavelength (label) that each node in the connection is responsible for Member Link distribute, but exist in the wavelength switched optical network and do not have wavelength Conversion or the limited constraint of wavelength Conversion, compare with the foundation that is connected of control TDM business, not only there is the competition of resource (bandwidth), also there is the competition of label (wavelength), can produce higher obstructive, though adopt Crankback mechanism can solve such problem, also can cause signaling frequently to recall inefficiency.

Based on this, the objective of the invention is the link bundle technology is applied in the wavelength switched optical network, propose Member Link selection, Wavelength Assignment and route and calculated the architectural framework that combines, and realized a kind of scheme that solves the problem of link bundle in the wavelength switched optical network by Routing Protocol (OSPF-TE) expansion, this scheme has kept the advantage of RFC4201 link bundle technology, solves the problem of wavelength switched optical network link bundle simultaneously.

Under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.

According to the embodiment of the invention, provide the tag changeable path path processing method of a kind of wavelength switched optical network (WSON) lining based on link bundle.

Fig. 1 is the flow chart based on the tag changeable path path processing method of link bundle according to the embodiment of the invention, and as shown in Figure 1, this method may further comprise the steps:

Step S102, route calculates and the Wavelength Assignment entity (for example, PCE) determine LSP via one or more harness links and one or more unbunding link;

Step S104, route calculating and Wavelength Assignment entity are selected Member Link according to first predetermined policy from each harness link;

Step S106, route calculating and Wavelength Assignment entity are according to second predetermined policy, determine that selected each Member Link and each unbunding link are used to the wavelength that transmits and the employed wavelength of node of definite LSP process in LSP, wherein, the employed wavelength of each node can be the wavelength afterwards through wavelength shifter, also can be wavelength without wavelength shifter, if the wavelength of process wavelength shifter, the then wavelength of this wavelength for from the wavelength Conversion available information of this node, selecting.

Below above-mentioned steps is elaborated.

(1) step S102

Route calculating and Wavelength Assignment entity are before calculating route, need know the link bundle information that is used to support route calculating and Wavelength Assignment in all harness links in advance, wherein, this link bundle information comprises: the wavelength constraint information of harness link, the wavelength available information of harness link, particularly, route calculating and Wavelength Assignment entity can pass through the described link bundle information of Routing Protocol (OSPF-TE or IS-IS-TE) acquisition.And the method for passing through prior art obtains the wavelength constraint information and the wavelength available information of unbunding link.

Route calculating and Wavelength Assignment entity are by calculating the wavelength constraint information of all Member Links in the harness link, obtain the wavelength constraint information of harness link, wherein, the wavelength constraint information of this harness link is meant: the union of all wavelengths constraint information that all Member Links in the harness link are supported.That is to say that the wavelength constraint information of harness link is the union of all Member Link wavelength constraint informations, when a wavelength was supported in a Member Link at least, the harness link just can be supported this wavelength.

Route calculating and Wavelength Assignment entity are by calculating the wavelength available information of all Member Links in the harness link, obtain the wavelength available information of harness link, wherein, the wavelength available information of harness link is meant: the union of all the Member Link wavelength availables in the harness link.And, but when a wavelength in many Member Links time spent all, this wavelength useful number of harness link is that this wavelength of all Member Links can be with the summation of number.

In label switched path foundation and demolishing process, this label switched path the wavelength available supported of the Member Link in the harness link of process when occupied, occupied wavelength is removed from all wavelength availables and concentrated, corresponding wavelength can reduce corresponding number with number in the harness link, and under the situation that finishes to take at this wavelength, add wavelength to all wavelengths also concentrate, corresponding wavelength can increase corresponding number with number in the harness link.When the wavelength available information of the Member Link in the harness link changes, the wavelength available information of harness link needs to be calculated again so, result of calculation remains the union of all Member Link wavelength available informations, and the wavelength available information of this harness link need be broadcasted again.

When the Member Link wavelength constraint information in the harness link changes, then the wavelength constraint information of harness link needs to be calculated again, result of calculation remains the union of all Member Link wavelength constraint informations, and the wavelength constraint information of this harness link need be broadcasted (that is inundation above) again.

(OSPF-TE or IS-IS-TE) carries out inundation with link bundle information via Routing Protocol, and any information relevant with Member Link can not if change, then be needed the link bundle information after this variation again by inundation by inundation in the harness link.

The link bundle information that route is calculated and the Wavelength Assignment entity can obtain by pre-configured mode (for example, by management plane with the link bundle information configuration to route calculate and the Wavelength Assignment entity in), also can be that each node sends to route calculating and Wavelength Assignment entity with link bundle information separately, and, when link bundle information changes, then need the link bundle information after this variation is configured again or is sent out.

Adopt that centralized route is calculated, when centralized Wavelength Assignment and centralized or distributed Member Link are selected, route calculating and Wavelength Assignment entity are before label switched path is set up, need know the parameter information of all Member Links in advance, wherein, parameter information comprises: wavelength constraint information and wavelength available information that all Member Links that each harness link comprises, each Member Link are supported, if route is calculated and the Wavelength Assignment entity must obtain these parameter informations by Routing Protocol, so just there is no need to use the link bundle technology.

The link bundle information that route is calculated and the Wavelength Assignment entity can also obtain by pre-configured mode (for example, by management plane with information configuration in this entity), also can be that the link bundle information that each node is incited somebody to action sends to route calculating and Wavelength Assignment entity, and link bundle information must be able to be configured or be sent out when changing again.

Route calculating and Wavelength Assignment entity are before calculating route, need obtain the parameter information of each node in advance, wherein, parameter information comprises: after the utilization link bundle technology, between each harness link of intranodal and other links (comprising harness link and unbunding link), the connectivity constraint information between the unbunding link, wavelength conversion capability constraint information, wavelength Conversion available information.

Route is calculated and the Wavelength Assignment entity can pass through Routing Protocol (OSPF-TE or IS-IS-TE) acquisition above-mentioned parameter information, the link bundle information that can also obtain by pre-configured mode (for example, by management plane with information configuration in this entity), also can be that each node sends to route calculating and Wavelength Assignment entity with its parameter information, and the parameter information of node must be able to be configured or be sent out when changing again.

Wavelength available transfer capability between Member Link in the harness link and other links (comprising Member Link and other unbunding link in other harness link) occupied or discharge after, wavelength available transfer capability information between corresponding harness link and other links (comprising other harness link and other unbunding link) can be calculated, result of calculation remains the union of the wavelength Conversion available information of all Member Links and other links in the harness link (comprising the Member Link in other unbunding links and other harness links), and need be broadcasted again.

Before label switched path is set up, route is calculated and the Wavelength Assignment entity all must get access to following information in advance: the wavelength constraint information of harness link and wavelength available information, and between the harness link of intra-node, between the unbunding link and the connectivity constraint information between harness link and the unbunding link, wavelength conversion capability constraint information and wavelength Conversion available information.

According to method shown in Figure 1, can be applied to the framework that following five kinds of route calculating, Wavelength Assignment and Member Link selection combine:

1, centralized route is calculated+centralized Wavelength Assignment+centralized Member Link selection; Perhaps,

2, centralized route is calculated+centralized Wavelength Assignment+distributed Member Link selection; Perhaps,

3, centralized route calculating+distributed Wavelength Assignment+centralized Member Link is selected; Perhaps,

4, centralized route calculating+distributed Wavelength Assignment+distributed Member Link is selected; Perhaps,

5, distributed route calculating+distributed Wavelength Assignment+distributed Member Link is selected.

When using above-mentioned arbitrary framework, before label switched path is set up, route is calculated and the Wavelength Assignment entity all must get access to the wavelength constraint information and the wavelength available information of harness link in advance, between the intra-node harness link, between the unbunding link and the connectivity constraint information between harness link and the unbunding link, wavelength conversion capability constraint information and wavelength Conversion available information.

Route calculate and the Wavelength Assignment entity definite LSP via one or more harness links and the unbunding link before, need know the parameter information of all harness links, this parameter information comprises: the wavelength constraint information of each harness link and unbunding link and wavelength available information, and between the intra-node harness link, connectivity constraint information, wavelength conversion capability constraint information and wavelength Conversion available information between the unbunding link, between harness link and the unbunding link.Route calculate and the Wavelength Assignment entity after the parameter information of knowing all harness links, when setting up a LSP link, can according to parameter information determine this LSP via one or more harness links.

Parameter information

Be connected to the different members link of same node by different interfaces, these interfaces have different connectednesses, for example, a typical WDM node as shown in Figure 2, this WDM node is made up of wavelength Conversion module (Wavelength Converter), multiplex/demultiplex module (Multiplex/De Multiplex) and wavelength Switching Module (Wavelength Switch).In the system of one 80 ripple, every optical fiber comprises 80 wavelength, owing to be subjected to the restriction of wavelength Conversion module ability, is not that each wavelength on every optical fiber can both exchange to any wavelength on any optical fiber.Suppose following scene one:

Optical fiber Fiber 1 and optical fiber Fiber 4 are communicated with, and optical fiber Fiber 2 and optical fiber Fiber 6 are communicated with, and optical fiber Fiber 3 and optical fiber Fiber 5 are communicated with.

The wavelength lambda 1 of Fiber 1 can be transformed into the wavelength lambda 2 on the Fiber 4, lambda 3 and lambda 4; Fiber 1 wavelength lambda 2 can be transformed into wavelength lambda 7 and the lambda 8 on the Fiber 4.Other wavelength can only exchange to the identical wavelength on the optical fiber Fiber 4 on the optical fiber Fiber 1.

The wavelength lambda 1 of Fiber 2 can exchange to wavelength lambda 4 and the lambda 5 on the Fiber 6.Other wavelength can only exchange to the identical wavelength on the optical fiber Fiber 6 on the optical fiber Fiber 2.

The wavelength lambda 3 of Fiber 3 can be transformed into wavelength lambda 7 and the lambda 8 on the Fiber 5; Fiber 3 wavelength lambda 1 can be transformed into wavelength lambda 5 and the lambda 6 on the Fiber 5, and other wavelength can only be transformed into the identical wavelength on the optical fiber Fiber5 on the optical fiber Fiber 3.

The communication information of this WDM intranodal is as follows:

[Fiber?1--->Fiber?4]

[Fiber?2--->Fiber?6]

[Fiber?3--->Fiber?5]

The wavelength conversion capability constraint information of this WDM intranodal is as follows:

[Fiber?1：lambda?1---->Fiber?4：lambda?2，lambda?3，lambda?4]

[Fiber?1：lambda?2---->Fiber?4：lambda?7，lambda?8]

[Fiber?2：lambda?1---->Fiber?6：lambda?4，lambda?5]

[Fiber?3：lambda?1---->Fiber?5：lambda?5，lambda?6]

[Fiber?3：lambda?3---->Fiber?5：lambda?7，lambda?8]

The wavelength Conversion available information of this WDM intranodal is as follows:

[Fiber?1：lambda?1---->Fiber?4：lambda?2，lambda?3，lambda?4]

[Fiber?1：lambda?2---->Fiber?4：lambda?7，lambda?8]

[Fiber?2：lambda?1---->Fiber?6：lambda?4，lambda?5]

[Fiber?3：lambda?1---->Fiber?5：lambda?5，lambda?6]

[Fiber?3：lambda?3---->Fiber?5：lambda?7，lambda?8]

Stipulate according to RFC4201, only have identical Link Type, TrafficEngineering metric, Resource Class, and the Member Link that head and the tail are positioned between the identical pair of L SR (Label Switch Router) can be bundled in together.Though these above-mentioned optical fiber have different connectednesses, but also can be tied to a harness link, but between the harness link, connectivity constraint information, wavelength conversion capability constraint information and the wavelength Conversion available information of harness link and unbunding link will be affected.Link by harness after, the communication information constraint information of intranodal, wavelength conversion capability constraint information and wavelength Conversion available information must be concluded sums up (Summary), be example with above-mentioned scene one below, after describing use link bundle technology, the summary (Summary) of how to calculate these information.

Scene two: supposing becomes a TE Link (Link 1) with optical fiber Fiber 1, Fiber 2 and Fiber 3 bindings, and the path computing entity needs (such as PCE) to know the connectedness of Link 1 and Fiber 4, Fiber 5 and Fiber 6 in advance.Optical fiber Fiber 1 and Fiber 4, Fiber2 and Fiber 6, Fiber 3 should no longer carry out inundation with the connectivity of Fiber 5, can not obtain these information by other paths but do not get rid of the path computing entity.Connectivity between harness link and the unbunding link, wavelength conversion capability constraint information and wavelength Conversion available information should be the Member Link in the harness link and the union (Union) of the connectivity between the unbunding link, wavelength conversion capability constraint information and wavelength Conversion available information.After using link bundle, path computing entity (such as PCE) need know that the information of node becomes:

The communication information of this WDM intranodal is as follows:

[Link?1--->Fiber?4]

[Link?1--->Fiber?5]

[Link?1--->Fiber?6]

The wavelength conversion capability constraint information of this WDM intranodal is as follows:

[Link?1：lambda?1---->Fiber?4：lambda?2，lambda?3，lambda?4]

[Link?1：lambda?2---->Fiber?4：lambda?7，lambda?8]

[Link?1：lambda?1---->Fiber?6：lambda?4，lambda?5]

[Link?1：lambda?3---->Fiber?5：lambda?7，lambda?8]

[Link?1：lambda?1---->Fiber?5：lambda?5，lambda?6]

The wavelength Conversion available information of this WDM intranodal is as follows:

[Link?1：lambda?1---->Fiber?4：lambda?2，lambda?3，lambda?4]

[Link?1：lambda?2---->Fiber?4：lambda?7，lambda?8]

[Link?1：lambda?1---->Fiber?6：lambda?4，lambda?5]

[Link?1：lambda?3---->Fiber?5：lambda?7，lambda?8]

[Link?1：lambda?1---->Fiber?5：lambda?5，lambda?6]

Scene three: suppose that optical fiber Fiber 5 and Fiber 6 are further tied, form harness link Link 2, then path computing entity (such as PCE) need know that the information of node becomes:

The communication information of this WDM intranodal is as follows:

[Link?1--->Fiber?4]

[Link?1--->Link?2]

The wavelength conversion capability constraint information of WDM intranodal is as follows:

[Link?1：lambda?1---->Fiber?4：lambda?2，lambda?3，lambda?4]

[Link?1：lambda?2---->Fiber?4：lambda?7，lambda?8]

[Link?1：lambda?1---->Link?2：lambda?4，lambda?5，lambda?6]

[Link?1：lambda?3---->Link?2：lambda?7，lambda?8]

The wavelength Conversion available information of Link 1 is as follows in the node WDM:

[Link?1：lambda?1---->Fiber?4：lambda?2，lambda?3，lambda?4]

[Link?1：lambda?2---->Fiber?4：lambda?7，lambda?8]

[Link?1：lambda?1---->Link?2：lambda?4，lambda?6]

[Link 1:ambda 1----〉Link 2:lambda 5, lambda 5] (two wavelength conversion capability can be used)

[Link?1：lambda?3---->Link?2：lambda?7，lambda?8]

Scene four: suppose to have a wavelength switching path through optical fiber Fiber 3 and Fiber 5, and used the wavelength Conversion between lambda 1 and the lambda 5.Fiber connectivity constraint information and wavelength conversion capability constraint information are with constant so; The wavelength Conversion available information will change.Originally there are two wavelength conversion capability between lambda 1 and the lambda 5, will be reduced to one now.Path computing entity (such as PCE) need be known following information so:

[Link?1：lambda?1---->Fiber?4：lambda?2，lambda?3，lambda?4]

[Link?1：lambda?2---->Fiber?4：lambda?7，lambda?8]

[Link?1：lambda?1---->Link?2：lambda?4，lambda?6]

[Link 1:lambda 1----〉Link 2:lambda 5] (only surplus wavelength conversion capability)

[Link?1：lambda?3---->Link?2：lambda?7，lambda?8]

Need to prove, route is calculated and the Wavelength Assignment entity can (for example obtain above-mentioned each parameter information by pre-configured mode, by management plane with information configuration in this entity), also can be that each node sends to route calculating and Wavelength Assignment entity with above-mentioned each parameter information, route be calculated and the Wavelength Assignment entity can also be known above-mentioned parameter information (for example node carries out inundation by the Routing Protocol of prior art to above-mentioned parameter information) by Routing Protocol.

Another example about parameter information is: suppose that optical fiber Fiber 1 supports wavelength lambda1, lambda 2, lambda3, and lambda 4, and lambda 5, and lambda 8, and lambda 9, and lambda 10, and lambda 11; Fiber2 supports wavelength lambda 4, and lambda 5, lambda6, and lambda 9, and lambda 10, and lambda 11, and lambda 12.Wavelength constraint information and the wavelength available information of Fiber 1 and Fiber 2 are as follows:

The wavelength constraint information:

Fiber?1：[lambda?1-lambda?5]，[lambda?8-lambda?11]

Fiber?2：[lambda?4-lambda?6]，[lambda?9-lambda?12]

The wavelength available information:

Fiber?1：[lambda?1-lambda?5]，[lambda?8-lambda?11]

Fiber?2：[lambda?4-lambda?6]，[lambda?9-lambda?12]

When these two optical fiber are tied to a link, such as Link1, the wavelength constraint information of this harness link and wavelength available information are as follows so:

The wavelength constraint information:

Link1：[lambda?1-lambda?6]，[lambda?8-lambda?12]

The wavelength available information:

Link1：[lambda?1-lambda?3]，

Link1:(lambda 4, and lambda 4) (note: two lambda 4 can use)

Link1:(lambda 5, and lambda 5) (note: two lambda 5 can use)

Link?1：[lambda?6-lambda?8]，

Link1:(lambda 9, and lambda 9) (note: two lambda 9 can use)

Link?1：[lambda?10-lambda?12]

Used the wavelength lambda 4 and lambda 5 of Fiber1 when certain bar wavelength switching path after, the variation of the wavelength available of Member Link can cause the wavelength available of harness link to change, and the wavelength available information of harness link should be calculated again.Therefore, the available lambda 5 of harness link and lambda 4 wavelength are only surplus respectively next.Up-to-date wavelength available information needs again inundation once.If certain the bar Member Link in the harness link breaks down (such as disconnected fine), the wavelength available information of harness link should be rejected the wavelength available information of the Member Link that breaks down so.When all Member Links of harness link all broke down, this harness link no longer inundation was gone out.

In addition, at present, in the link bundle technology, when the link bundle information of each harness link is flooded, can not flood harness link wavelength constraint information and wavelength available information, but like this, can produce the foundation of LSP and hinder.The path computing entity can obtain above-mentioned each parameter information by pre-configured mode, also can be that each node sends to the path computing entity with above-mentioned each parameter information, the path computing entity can also be known above-mentioned parameter information (for example node carries out inundation by Routing Protocol to above-mentioned parameter information) by Routing Protocol.So, consideration (for example is increased to harness link wavelength constraint information and wavelength available information in the middle of the flow parameter of link bundle, the route agreement is expanded), these two information are flooded, provide below and how the route agreement is expanded, with wavelength constraint information and the wavelength available information that obtains these harness links.

Link bundle information

Route is calculated and the Wavelength Assignment entity is known in all harness links each link bundle information, and link bundle information is carried out inundation.Wherein, link bundle information comprises: the wavelength constraint information of harness link, the wavelength available information of harness link.The wavelength constraint information of harness link is meant: the union of all wavelengths that all Member Links in the harness link are supported.The wavelength available information of harness link is meant: the union of all wavelengths that all Member Links in the harness link are supported, when the wavelength that the Member Link in the harness link is supported is occupied, occupied wavelength is removed from all wavelength availables and concentrated, and under the situation that finishes to take at this wavelength, wavelength is added to all wavelength availables and concentrated.

No matter adopting centralized Wavelength Assignment still is that distributed wavelength distributes, after all the wavelength constraint information of Member Link in the harness link and wavelength available information can being summed up (Summary), traffic engineering parameter together with the harness link of RFC4201 definition is carried out inundation, and other information of member's link can not be with harness link inundation.(OSPF/IS-IS)。

The link bundle information that the node of harness both link ends is stored can obtain by configuration, perhaps, utilizes the automatic discovery of passing through of RFC4204 (LMP) definition to obtain.

Because the entity of carrying out Wavelength Assignment can access the wavelength constraint information and the wavelength available information of harness link, carry out the entity of Wavelength Assignment and just can carry out wavelength channel calculating and Wavelength Assignment effectively accurately, and do not mind that it still is that distributed wavelength distributes that Wavelength Assignment and Member Link select to adopt centralized Wavelength Assignment.Like this, need expand the relevant ietf standard of existing harness link, the expansion of Routing Protocol is divided into two steps as described below.

First: the wavelength constraint information of harness link

Ietf draft draft-ietf-ccamp-rwa-info expands route agreement (OSPF-TE/IS-IS), increased the description of wavelength connectivity, wavelength conversion capability constraint information and the wavelength Conversion available information of wavelength constraint information, wavelength available information and node to TE Link, Fig. 3 is the schematic diagram of draft draft-ietf-ccamp-rwa-info to the expansion of route agreement (OSPF-TE/IS-IS).

By (for example to the relevant criterion of existing harness link, RFC4201) expand, after can wavelength constraint information and wavelength available information summary (Summary) with Member Link in the harness link, traffic engineering parameter together with the harness link of RFC4201 definition is carried out inundation, harness link wavelength constraint information is all Member Link wavelength constraint information unions, Fig. 4 be in the prior art RFC4201 to the schematic diagram of the regulation of the flow parameter of harness link.The present invention expands traffic engineering parameter shown in Figure 4, increase the wavelength constraint information (as the PortWavelengthRestriction among Fig. 5) of harness link, other flow parameters in company with the harness link are flooded to Interior Gateway Protocol (InteriorGateway Protocol together, abbreviate IGP as) lining, wherein, the wavelength constraint information of calculating harness link is the local policy problem of intranodal.

The wavelength constraint information that has added Member Link can cause the increase of the TE information of harness link, but these information only needs inundation once, and other flow parameter information of Member Link can not be by inundation, so do not influence for the performance of Routing Protocol.And owing to need not every Member Link is carried out the maintenance of RSVP-TE signaling status and OSPF-TE neighbours' maintenance, after WSON had used the link bundle technology, the advantage of link bundle did not change.

In addition, an optical fiber the wavelength that can support be pre-configured, and be static information, these attributes are changed needs HardwareUpgring usually.If the wavelength constraint information of Member Link really will change, the variation of the wavelength constraint information of Member Link can cause the variation of the wavelength constraint information of harness link so, the wavelength constraint information of harness link should be calculated again, if formed by a plurality of link aggregations, harness link wavelength constraint information remains all Member Link wavelength constraint information unions so.

Second: harness link wavelength available information

The present invention expands the traffic engineering parameter that RFC4201 has defined, increase a wavelength available information (as the AvailableWavelengthInfo among Fig. 5), wavelength available (label) information of expression harness link is flooded in the IGP together in company with other flow parameters of harness link.Article one, harness link wavelength available information is the union of all Member Link wavelength available information.

Because in the connection foundation and demolishing process of LSP, the wavelength available of Member Link can change, so the variation of the wavelength available of Member Link can cause the wavelength available of harness link to change, the wavelength available information of harness link should be calculated again.If formed by a plurality of link aggregations, the wavelength available information of harness link remains the union of all Member Link wavelength available informations so, and wherein, the wavelength available information of calculating the harness link is the local policy problem of intranodal.

After wavelength switched optical network application link harness technology, the maximum bandwidth reserved of harness link (Maximum Reservable Bandwidth), bandwidth reserved (UnreservedBandwidth), maximum LSP bandwidth (Maximum LSP Bandwidth) and harness link bandwidth computational methods are abideed by the treatment principle of RFC4201 defined.

Utilize existing IETF consensus standard below, an instantiation of Routing Protocol expansion is provided.Fig. 5 is the schematic diagram of the route extended method of the embodiment of the invention, on the RFC4201 standard base, has increased by two sub-TLV.

First sub-TLV is PortWavelengthRestriction, consider that draft-ietf-ccamp-rwa-info has become IETF working group draft, this example directly adopts the same format of the PortWavelengthRestriction among the draft-ietf-ccamp-rwa-info to define, and this sub-TLV has described the wavelength constraint information of harness link.

Second sub-TLV is AvailableWavelengthInfo, and it has described the wavelength available information of harness link, and its formal definition as shown in Figure 6.Detailed content is described below: W:3bits, be used for representing the number of bits of wavelength state, and for example, during W=1, the state (whether this wavelength is assigned with) of respective wavelength is indicated in expression with the value of a bit.The related wavelength of these wavelength and above-mentioned PortWavelengthRestriction is related, is man-to-man relation; AvailableWavelengthInfo Length:16bits, the length of indication AvailableWavelengthInfo; AvailableWavelengthInfo: the state of wavelength, each bit or a plurality of bit (by " W " indication) and the indication wavelength upstate.For example, under the situation of W=1, bit is 1 o'clock, represents this corresponding wavelength to use, and bit is 0 o'clock, represents this wavelength to be assigned with.Padded bit: be the byte that guarantees that 32 bit aligned are filled.

(2) step S104 is to step S106

In this step, route calculating and Wavelength Assignment entity are known the parameter information of all Member Links, wherein, parameter information comprises: the information of all wavelengths that all Member Links that each harness link comprises, each Member Link are supported, wherein, the information of all wavelengths of each Member Link support comprise following one of at least: the wavelength available information of Member Link, the wavelength constraint information of Member Link.

It is one of following that first predetermined policy comprises: select Member Link in the harness link at random; All available Member Links in the harness link are sorted according to certain strategy or rule (sorting such as the weight of link, remaining bandwidth or the like), select the Member Link in precalculated position, ordering back; Select according to the number of times that Member Link in the harness link was used, from available Member Link, select to be used the maximum Member Link of number of times; From the harness link, select Member Link according to offered load.

It is one of following that second predetermined policy comprises: select at random in the wavelength available of Member Link; All wavelength availables to Member Link sort according to certain strategy (such as the weight of wavelength), select the wavelength in precalculated position, ordering back; The number of times that was used according to the Member Link medium wavelength selects to be used the maximum wavelength of number of times from wavelength available; Select from the wavelength available of Member Link according to offered load.

Example

Use the wavelength switched optical network topological diagram after the link bundle technology to be example with shown in Figure 7 below, describe step S102, S104 and S106 and how specifically to implement the method that label switched path is set up.

As shown in Figure 7: Link12 is connected with ComponentLink25-1 and Component Link25-2 among the harness link Link25; Link23 is connected with Component Link34-1 and Component Link34-2 among the harness link Link34; Link54 is connected with Component Link25-1 and Component Link25-2 among the harness link Link25; Link46 is connected with Component Link34-1 and Component Link34-2 among the harness link Link34; Link54 is connected with harness link Link46.Have wavelength conversion capability λ 1--between Component Link24-1 and the Link54 and between Component Link24-2 and the Link54〉λ 2.Between Component Link34-1 and the Link46, between Component Link34-2 and the Link46 and have wavelength conversion capability λ 2--between Link54 and the Link46 λ 1, λ 2--λ 4 and λ 3--λ 4.

According to wavelength switched optical network topological diagram shown in Figure 7, route is calculated and the Wavelength Assignment entity must be known wavelength switched optical network topological diagram shown in Figure 8 in advance, and obtains following information by network topological diagram shown in Figure 8:

(1), obtain the connectivity constraint information of each intranodal, specific as follows shown in:

Node 2:

[Link?12--->Bundled?Link25]

[Link?12--->Link23]

Node 3:

[Link?23--->Bundled?Link34]

Node 4:

[Bundled?Link34--->Link46]

[Link54--->Link46]

Node 5:

[Bundled?Link25--->Link54]

(2), obtain the wavelength conversion capability constraint information of each intranodal, specific as follows shown in:

Node 5:

[Bundled?Link?25：λ1---->Link54：λ2]

Node 4:

[Bundled?Link?34：λ2---->Link46：λ1，λ4]

[Bundled?Link?34：λ3---->Link46：λ4]

[Link?54：λ2---->Link46：λ1，λ4]

[Link?54：λ3---->Link46：λ4]

(3), obtain the wavelength Conversion available information of each intranodal, specific as follows shown in:

Node 5:

[Bundled?Link?25：λ1---->Link54：λ2]

Node 4:

[Bundled?Link?34：λ2---->Link46：λ1，λ4]

[Bundled?Link?34：λ3---->Link46：λ4]

[Link?54：λ2---->Link46：λ1，λ4]

[Link?54：λ3---->Link46：λ4]

(4), obtain the wavelength constraint information of each link, specific as follows shown in:

Link12：λ1，λ2，λ3

Link23：λ1，λ2，λ3

Link54：λ2，λ3，λ5

Link46：λ1，λ4

Bundled?Link25：λ1，λ2，λ3，λ6

Bundled?Link34：λ1，λ2，λ3，λ4

(5), obtain the wavelength available information of each link, specific as follows shown in:

Link12：λ1，λ2，λ3

Link23：λ1，λ2，λ3

Link54：λ2，λ3，λ5

Link46：λ1，λ4

Bundled Link25: λ 1, λ 2, and λ 2, and λ 3, λ 6 (two λ 2 can use)

Bundled?Link34：λ1，λ2，λ3，λ4

Scene: suppose that the client need set up a wavelength switching path between No. 1 node and No. 6 nodes, there are following several optional routes (need to prove: do not having under the situation of wavelength conversion capability, the some wavelength on optical fiber can only be switched to the identical optical fiber on the optical fiber of an other connection) so:

Optional route 1: through 1,2,3,4 and No. 6 node, use wavelength X 1, the weight in whole piece path is 4; Do not use the wavelength conversion capability of any intra-node.

Optional route 2: through 1,2,3, No. 4 node, use wavelength X 2, at No. 4 node places, arrive No. 6 nodes through wavelength Conversion λ 2 → λ 1 or λ 2 → λ 4, the weight in whole piece path is 4; This route has been used a wavelength conversion capability altogether.

Optional route 3: through 1,2,3, No. 4 node, use wavelength X 3, at No. 4 node places, arrive No. 6 nodes through wavelength Conversion λ 3 → λ 4, the weight in whole piece path is 4; This route has been used a wavelength conversion capability altogether.

Optional route 4: through 1,2,5, No. 4 node, use wavelength X 2, at No. 4 node places, arrive No. 6 nodes through wavelength Conversion λ 2 → λ 1 or λ 2 → λ 4, the weight in whole piece path is 5; This route has been used a wavelength conversion capability altogether.

Optional route 5: through 1,2,5, No. 4 node, use wavelength X 3, at No. 4 node places, arrive No. 6 nodes through wavelength Conversion λ 3 → λ 4, the weight in whole piece path is 5; This route has been used a wavelength conversion capability altogether.

Optional route 6: through 1,2, No. 5 node, use wavelength X 1, at No. 5 node places, arrive No. 4 nodes through wavelength Conversion λ 1 → λ 2, at No. 4 node places, arrive No. 6 nodes through wavelength Conversion λ 2 → λ 1 or λ 2 → λ 4, the weight in whole piece path is 5; This route has been used two wavelength conversion capability altogether.

Route is calculated and the Wavelength Assignment entity will be according to certain strategy in above-mentioned several optional routes, select an optional route and be used to set up label switched path, these strategies can adopt the acquiescence implementation or decide (such as being configured by management plane) by the mode of configuration.

For example, the strategy that route is calculated and the Wavelength Assignment entity obtains is: pay the utmost attention to weight, wavelength conversion capability secondly, under this strategy, should at first select the route of weight maximum, having such as above-mentioned that to have weight limit all be three routes of 5, all is the route of selecting cost wavelength conversion capability minimum in 5 the route in these three weights, such as above-mentioned optional route 4 and optional route 5.If pay the utmost attention to wavelength conversion capability, secondly weight should select optional route 1 so, because it does not spend the wavelength conversion capability of any node, the Internet resources of cost are minimum, and cost is saved most, and the whole piece path all is to use wavelength X 1.

If it is preferential that the strategy of taking is a weight, wavelength conversion capability secondly, route is calculated and the Wavelength Assignment entity has just been determined route between No. 1 node and No. 6 nodes so, it is through Link12, Bundled Link25, Link54 and Link46.Follow-up step S104 and S 106 are example with this route, in conjunction with the framework that route calculating, Wavelength Assignment and Member Link are selected, describe corresponding implementation method.At this moment, the wavelength Conversion of wavelength on the Member Link of label clearing house process, unbunding link and the Member Link and intranodal use also is not determined.

In the present invention, if adopting centralized Wavelength Assignment and centralized Member Link selects, the entity of carrying out route calculating and Wavelength Assignment can be by the ERO subobject after the draft draft-ietf-mpls-explicit-resource-control-bundle expansion, set up in the process in connection, if carry out wavelength constraint information and wavelength available information that route calculating and Wavelength Assignment entity can be known Member Link, meeting explicitly appointment＜harness link, Member Link, label 〉, and centralized Wavelength Assignment and link bundle technology combined.That is, RWA need know that wavelength constraint information and wavelength available information on every Member Link can carry out Wavelength Assignment.

Centralized route is calculated+centralized Wavelength Assignment+centralized Member Link selection

In step S102, route calculate and determined No. 1 node of Wavelength Assignment entity and No. 6 nodes between route (it is through Link12, Bundled Link25, Link54 and Link46), if having selected centralized route calculates+framework of centralized Wavelength Assignment, do not having under wavelength Conversion or the wavelength Conversion condition of limited, set up the probability that blocks in order to reduce to connect, Member Link also adopts centralized the selection, therefore the entity of carrying out Wavelength Assignment need be known wavelength constraint information and the wavelength available information on the Member Link in advance before label switched path is set up, can determine to select which bar Member Link.

According to example shown in Figure 8, after route is calculated and the Wavelength Assignment entity determined route (it is through Link12, Bundled Link25, Link54 and Link46) between No. 1 node and No. 6 nodes.Route is calculated and the wavelength constraint information and the wavelength available information of the Member Link that the Wavelength Assignment entity also needs to know that Bundled Link25 is comprised.After having known these information, because this route can be selected the wavelength X 2 or λ 3 (if the selection λ 1 of harness link, cause the whole piece route need spend wavelength conversion capability twice), so it need select a Member Link that satisfies condition at BundledLink25.According to shown in Figure 7, owing to there are two Member Links that satisfy condition, the Member Link of policy selection that can mention according to this patent S104.Supposed that route is calculated and the Wavelength Assignment entity selection Component Link25-2, on this harness link, exist two wavelength to satisfy condition so, be respectively λ 2 or λ 3, the suitable wavelengths of policy selection that can be mentioned according to this patent S106 is such as λ 2.This moment, route is calculated and the Wavelength Assignment entity has just been determined detailed route: through 1,2,5,4, Link12, Bundled Link25, Link54 use wavelength X 2, at No. 4 node places, through wavelength Conversion λ 2--〉λ 1 or λ 2--〉λ 4, through No. 6 nodes of the most total arrival of Link46, the weight in whole piece path is 5, and wherein harness link Bundled Link25 has selected Member Link Component Link25-2; This route has been used a wavelength conversion capability altogether, and on No. 4 nodes, λ 2 can be exchanged into λ 1 or λ 4, and λ 3 can only be converted to λ 4, and route is calculated and the Wavelength Assignment entity should determine that selection λ 2 still be λ 3 according to certain strategy.Such as selecting λ 2--〉λ 4 or λ 2--〉λ 1 (because select one of them, λ 2 still can be converted at this node), rather than λ 3--〉λ 4, suppose finally to have selected λ 2--〉λ 4.

Route calculate and the Wavelength Assignment entity determined the harness link of process, Member Link in the harness link, after the wavelength of unbunding link and relevant link and the wavelength conversion capability of use, the ERO subobject of the draft draft-ietf-mpls-explicit-resource-control-bundle expansion of MPLS working group that just can be by IETF, set up in the process at label switched path, for each harness link and unbunding link, difference explicitly appointment＜harness link, Member Link, label (wavelength)〉and＜unbunding, label (wavelength) 〉, carry out the explicit control of resource.

When adopting the Member Link of centralized route calculating+centralized Wavelength Assignment+centralized to select, can handle according to following several steps:

Step 1: (such as PCE) obtains wavelength constraint information, the wavelength available information of Member Link in the harness link in the entity of calculating of execution route and Wavelength Assignment, can these information be sent to the entity that execution route calculates by centralized configuration mode (for example entity that these information configuration is calculated to execution route by management plane) or each node.

Step 2: route is calculated and the entity of Wavelength Assignment is carried out route calculating, Member Link is selected and the Wavelength Assignment process.Determined the wavelength of harness link, the Member Link in the harness link, unbunding link and definite relevant link of process and the intra-node wavelength conversion capability of use.

Step 3: the ERO subobject of the draft draft-ietf-mpls-explicit-resource-control-bundle expansion of the MPLS working group by IETF, utilize the output result (route is calculated and the Wavelength Assignment result) of step 2, set up in the process in connection, for each harness link and unbunding link, difference explicitly appointment＜harness link, Member Link, label (wavelength)〉and＜the unbunding link, label (wavelength) 〉, carry out the explicit control of resource.Such as, according to above-mentioned example, the resource among explicit appointment Fig. 7 is＜Link12 that λ 2 〉,＜Bundled Link25, Component Link25-2, λ 2 〉,＜Link54, λ 2 〉,＜Link46, λ 4 〉

Step 4: source node (No. 1 node among Fig. 8) is initiated the distributed process of setting up of connection, carries the ERO subobject that step 3 generates in the signaling (Path message).

Step 5: intermediate node (2,5, No. 4 nodes among Fig. 8) receive connect set up signaling (Path message) after, according to ERO and ERO subobject respectively appointment＜the unbunding link, label (wavelength)〉and＜the harness link, Member Link, label (wavelength)〉carry out member's link selection and Wavelength Assignment.

Step 6: intermediate node (2,5, No. 4 nodes among Fig. 8) receives to connect and sets up signaling and confirm after (Resv message), according to the wavelength of reserving, the resource (as ROADM or OXC) that transmits the plane is configured.

Step 7: route is calculated and the Wavelength Assignment entity topology information after the collection network variation again.Topology information after can will changing by centralized configuration mode (topology information after for example will changing by management plane is configured to the entity that execution route calculates) or each node sends to the entity that execution route calculates.

Centralized route is calculated+centralized Wavelength Assignment+distributed Member Link selection

In step S102, route calculate and determined No. 1 node of Wavelength Assignment entity and No. 6 nodes between route (it is through Link12, Bundled Link25, Link54 and Link46), if selected centralized route to calculate+the centralized framework that Wavelength Assignment+distributed Member Link is selected, need so route calculate and the Wavelength Assignment entity further specify the whole piece label switched path the wavelength that uses on the harness link of process and the unbunding link.Mention in the above-mentioned example through 1,2,5,4 nodes, can use on Link12, Bundled Link25 and the Link54 link: λ 2 or λ 3 are (if select λ 1, cause the whole piece route need spend wavelength conversion capability twice), and on No. 4 nodes, λ 2 can be exchanged into λ 1 or λ 4, and λ 3 can only be converted to λ 4, and route is calculated and the Wavelength Assignment entity should determine that selecting λ 2 still is λ 3 according to certain strategy.At this time should select the more wavelength of wavelength Conversion available capability, such as selecting λ 2--〉λ 4 or λ 2--〉λ 1 (because select one of them, λ 2 still can be converted at this node), rather than λ 3--λ 4.Suppose finally to have selected λ 2--〉λ 4, the wavelength of whole piece label switched path is just decided so, that is to say that Link12, Bundled Link25, Link54 select wavelength X 2, and Link46 selects wavelength X 4.

Adopt centralized route to calculate+centralized Wavelength Assignment+when distributed Member Link is selected, can handle according to following several steps:

Step 1: source node (No. 1 node among Fig. 8) calculate according to route and determined No. 1 node of Wavelength Assignment entity and No. 6 nodes between route (it is through Link12, Bundled Link25, Link54 and Link46), utilize prior art to generate corresponding ERO object, indicate label switched path the harness link and the unbunding link of process, and the employed wavelength of these links, such as, according to above-mentioned example, resource among explicit appointment Fig. 8 is＜Link12, λ 2 〉,＜Bundled Link25, λ 2 〉,＜Link54, λ 2 〉,＜Link46, λ 4 〉, and this ERO object put into Path message, then wavelength available λ 2 is put into the Label Set object of Path message, No. 2 nodes send Path message downstream at last.

After step 2:2 node received the Path message of upstream, it was found and will send Path message on harness link Bundled Link25 toward No. 5 nodes in downstream.It need select one to satisfy the specified wavelength of ERO object in the harness link, the wavelength X 2 that found that Component Link25-1 and Component Link25-2 is all available, can select a Member Link according to above-mentioned first predetermined policy, such as, the result who selects is Component Link25-2, No. 2 nodes are put into a newly-generated Label Set object with selected wavelength X 2 so, and newly-generated Label Set object is put in the Path message, at last, No. 5 nodes send Path message downstream.

After step 3:5 node received the Path message of upstream, it found to need to send Path message toward No. 4 nodes in downstream on unbunding link Link54.No. 5 nodes are from the wavelength available of Link54, the specified wavelength of ERO object is satisfied in selection, just λ 2, selected wavelength X 2 is put into a newly-generated Label Set object, and this newly-generated Label Set object is put in the Path message, at last, No. 4 nodes send Path message downstream.

After step 4:4 node received the Path message of upstream, it found to need to send Path message toward No. 6 nodes in downstream on unbunding link Link46.No. 4 nodes are selected to satisfy the specified wavelength of ERO object from the wavelength available of Link46, and just λ 4.At this moment, its finds the wavelength X on the Link54 2 to be transformed into the λ 4 on the Link46, and the λ 2 in No. 4 nodes can be transformed into the λ 4 on the Link46 really; So No. 4 node takies this wavelength conversion capability.At this moment, generate a new Label Set object, and λ 4 is put in this object, and this newly-generated Label Set object is put in the Path message, last, No. 6 nodes send Path message downstream.

After step 5:6 node received the Path message of upstream, its discovery Label Set object had been specified λ 4 wavelength.So No. 6 nodes subtract 1 with the useful number of λ 4 in the wavelength available of Link46, and inundation again.No. 6 node generates a Label object, λ 4 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 6 node sends Resv message to No. 4 nodes.

After step 6:4 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 4), according to the wavelength conversion capability λ 2--that takies〉Label object of λ 4 generations, λ 2 is put into this Label object, and this Label object put into Resv message, at last, No. 4 node sends Resv message to No. 5 nodes, and configuration transmits the resource (such as ROADM or OXC) on plane.No. 4 nodes subtract 1 with the useful number of λ 4 in the wavelength available of Link46, and the available number of λ 2 in the wavelength available of Link54 is subtracted 1, and inundation again.With λ 2--in the wavelength conversion capability information between Link54 and the Link46〉λ 4 can subtract 1 with number, and inundation again

After step 7:5 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 2), the resource on the transmission plane between configuration member's link Component Link25-2 and the Link54 (such as ROADM or OXC).No. 5 node generates a Label object, λ 2 is put into this Label object, and this Label object is put into Resv message, and last, No. 5 node sends Resv message to No. 2 nodes on Bundled Link.No. 5 nodes subtract 1 with the available number of λ 2 in the wavelength available of Link54, and the available number of the wavelength available λ 2 of harness link Bundled Link25 is subtracted 1 (last, also surplus wavelength available).

After step 8:2 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 2), the resource on the transmission plane between configuration member's link Component Link25-2 and the Link12 (such as ROADM or OXC).No. 2 node generates a Label object, λ 2 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 2 node sends Resv message to No. 1 node.No. 5 nodes subtract 1 with the available number of λ 2 in the wavelength available of Link12, and the available number of the wavelength available λ 2 of harness link Bundled Link25 is subtracted 1 (last, also surplus wavelength available).

After step 9:1 node receives the Resv message in downstream,, revise the wavelength available information of Link12, λ 2 wavelength can be subtracted 1 with number according to the specified wavelength of Label object (λ 2), and inundation again.

Centralized route calculating+distributed Wavelength Assignment+centralized Member Link is selected

In step S102, route calculate and determined No. 1 node of Wavelength Assignment entity and No. 6 nodes between route (it is through Link12, Bundled Link25, Link54 and Link46), select framework if selected centralized route calculating+distributed Wavelength Assignment+centralized Member Link, the entity of calculating of execution route and Wavelength Assignment need be known wavelength constraint information and the wavelength available information on the Member Link in advance before label switched path is set up, can determine to select which bar Member Link.

According to route calculate and the resultant Fig. 8 of Wavelength Assignment entity in topology information, it knows that there are several wavelength selection schemes in the route (it passes through Link12, Bundled Link25, Link54 and Link46) between No. 1 node and No. 6 nodes:

(1), use wavelength X 2, at No. 4 node places, through wavelength Conversion λ 2-through 1,2,5,4〉λ 1 or λ 2-〉No. 6 nodes of λ 4 arrival, the weight in whole piece path is 5; This route has been used a wavelength conversion capability altogether.

(2), use wavelength X 3, at No. 4 node places, through wavelength Conversion λ 3-through 1,2,5,4〉No. 6 nodes of λ 4 arrival, the weight in whole piece path is 5; This route has been used a wavelength conversion capability altogether.

At this time, relate to that route is calculated and the Wavelength Assignment entity is Member Link of Bundled Link25 selection, the Member Link of policy selection that can mention according to this patent S104.Supposed that route is calculated and the Wavelength Assignment entity selection Component Link25-2, so, the choosing wavelength that satisfies condition on this Component Link25-2 comprises λ 2 and λ 3.Which, need set up in the process at label switched path, by the local behavior decision of node as for selecting wavelength.

If when adopting the Member Link of centralized route calculating+distributed Wavelength Assignment+centralized to select, can handle according to following several steps:

Step 1: source node (No. 1 node among Fig. 8) calculate according to route and determined No. 1 node of Wavelength Assignment entity and No. 6 nodes between route (it is through Link12, Bundled Link25, Link54 and Link46), utilize prior art to generate corresponding ERO and ERO subobject, indicate label switched path the harness link of process, Member Link and unbunding link (such as, according to above-mentioned example, resource among explicit appointment Fig. 8 is Link12,＜Bundled Link25, Component Link25-2 〉, Link54, Link46), and with this ERO and ERO subobject put into Path message.With the wavelength available λ 2 of Link12, λ 3 puts into the Label Set object of Path message.At last, No. 2 nodes send Path message downstream.

After step 2:2 node received the Path message of upstream, it was found and will send Path message on harness link Bundled Link25 toward No. 5 nodes in downstream.It is according to the Member Link Component Link25-2 of ERO subobject appointment, from the wavelength available of ComponentLink25-2, the wavelength of the specified wave-length coverage of upstream Label Set object is satisfied in selection, so (λ 2 with selected wavelength, λ 3) put into a newly-generated Label Set object, newly-generated Label Set object is put in the Path message, and last, No. 5 nodes send Path message downstream.

After step 3:5 node received the Path message of upstream, it found to need to send Path message toward No. 4 nodes in downstream on unbunding link Link54.No. 5 nodes are from the wavelength available of Link54, the wavelength of the specified wave-length coverage of upstream Label Set object is satisfied in selection, so (λ 2 with selected wavelength, λ 3) put into a newly-generated Label Set object, and this newly-generated Label Set object is put in the Path message, at last, No. 4 nodes send Path message downstream.

After step 4:4 node received the Path message of upstream, it found to need to send Path message toward No. 6 nodes in downstream on unbunding link Link46.But it finds not satisfy the specified wavelength of Label Set object in the Path message on the Link46, and at this moment, it need check that whether the specified wavelength of Label Set object can be switched to some wavelength available on the Link46 at intra-node.Found that λ 2 specified in the Label Set object can be transformed into the λ 1 on the Link46, λ 4; Specified λ 3 can be transformed into the λ 4 on the Link46 in the Label Set object; So No. 4 node generates a new Label Set object, and with λ 1, λ 4 puts in this object, and this newly-generated Label Set object is put in the Path message, and is last, No. 6 nodes send Path message downstream.

After step 5:6 node received the Path message of upstream, its discovery Label Set object had been specified a plurality of wavelength (λ 1, and λ 4).Second predetermined policy that can mention according to this patent is selected a wavelength.Suppose to have selected λ 4.No. 6 node generates a Label object, λ 4 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 6 node sends Resv message to No. 4 nodes.No. 6 nodes subtract 1 with the useful number of λ 4 in the wavelength available of Link46, and inundation again.

After step 6:4 node receives the Resv message in downstream,, can be according to certain strategy at available wavelength conversion capability λ 2--according to the specified wavelength of Label object (λ 4)〉λ 4 and λ 3--〉select one among the λ 4.At this time should select the more wavelength of wavelength Conversion available capability, such as selecting λ 2--〉λ 4 or λ 2--〉λ 1 (because select one of them, λ 2 still can be converted at this node), rather than λ 3--λ 4.Suppose to have selected λ 2--〉λ 4, No. 4 nodes generate a Label object so, and λ 2 is put into this Label object, and this Label object put into Resv message, at last, No. 4 node sends Resv message to No. 5 nodes, and configuration transmits the resource (such as ROADM or OXC) on plane.No. 4 nodes subtract 1 with the useful number of λ 4 in the wavelength available of Link46, and the available number of λ 2 in the wavelength available of Link54 is subtracted 1, and inundation again.With λ 2--in the wavelength conversion capability information between Link54 and the Link46〉λ 4 can subtract 1 with number, and inundation again.

After step 7:5 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 2), the resource on the transmission plane between configuration member's link Component Link25-2 and the Link54 (such as ROADM or OXC).No. 5 node generates a Label object, λ 2 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 5 node sends Resv message to No. 2 nodes.No. 5 nodes subtract 1 with the available number of λ 2 in the wavelength available of Link54, and the available number of the wavelength available λ 2 of harness link Bundled Link25 is subtracted 1 (last, also surplus wavelength available).

After step 8:2 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 2), the resource on the transmission plane between configuration member's link Component Link25-2 and the Link12 (such as ROADM or OXC).No. 2 node generates a Label object, λ 2 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 2 node sends Resv message to No. 1 node.No. 5 nodes subtract 1 with the available number of λ 2 in the wavelength available of Link12, and the available number of the wavelength available λ 2 of harness link Bundled Link25 is subtracted 1 (last, also surplus wavelength available).

After step 9:1 node receives the Resv message in downstream,, revise the wavelength available information of Link12, λ 2 wavelength can be subtracted 1 with number according to the specified wavelength of Label object (λ 2), and inundation again.

(centralized route is calculated or distributed route is calculated)+distributed Wavelength Assignment+distributed Member Link is selected

In step S104, route (it is through Link12, Bundled Link25, Link54 and Link46) between route is calculated and the Wavelength Assignment entity is determined No. 1 node and No. 6 nodes, select framework if adopt distributed Wavelength Assignment+distributed Member Link, the selection of Wavelength Assignment and Member Link is when label switched path is set up so, is finished by calculating of the route on each node and Wavelength Assignment entity.

When adopting distributed Wavelength Assignment+distributed Member Link to select, handle according to following several steps, wherein Fig. 9 has described the signalling interactive process that whole label switched path is set up:

Step 1: source node (No. 1 node among Fig. 9) calculate according to route and determined No. 1 node of Wavelength Assignment entity and No. 6 nodes between route (it is through Link12, Bundled Link25, Link54 and Link46), utilize prior art to generate corresponding ERO object, indicate label switched path the harness link of process and unbunding link (such as, according to above-mentioned example, resource among explicit appointment Fig. 8 is Link12, Bundled Link25, Link54, Link46), and with this ERO object put into Path message.With the wavelength available λ 1 of Link12, λ 2, and λ 3 puts into the Label Set object of Path message.At last, No. 2 nodes send Path message downstream.

After step 2:2 node received the Path message of upstream, it was found and will send Path message on harness link Bundled Link25 toward No. 5 nodes in downstream.It need be selected one and satisfy the specified wave-length coverage of Label Set object in the harness link, found that Component Link25-1 and Component Link25-2 meet the demands, can select a Member Link according to first predetermined policy that this patent is mentioned, such as, the result who selects is Component Link25-2, No. 2 nodes are from the wavelength available of Component Link25-2 so, the wavelength of the specified wave-length coverage of upstream Label Set object is satisfied in selection, (λ 2 with selected wavelength, λ 3) put into a newly-generated Label Set object, newly-generated Label Set object is put in the Path message, at last, No. 5 nodes send Path message downstream.

After step 3:5 node received the Path message of upstream, it found to need to send Path message toward No. 4 nodes in downstream on unbunding link Link54.No. 5 nodes are from the wavelength available of Link54, the wavelength of the specified wave-length coverage of upstream Label Set object is satisfied in selection, (λ 2 with selected wavelength, λ 3) put into a newly-generated Label Set object, and this newly-generated Label Set object is put in the Path message, at last, No. 4 nodes send Path message downstream.

After step 4:4 node received the Path message of upstream, it found to need to send Path message toward No. 6 nodes in downstream on unbunding link Link46.But it finds not satisfy the specified wavelength of Label Set object on the Link46, and at this moment, it need check that whether the specified wavelength of Label Set object can be switched to some wavelength available on the Link46 at intra-node.Found that λ 2 specified in the Label Set object can be transformed into the λ 1 on the Link46, λ 4; Specified λ 3 can be transformed into the λ 4 on the Link46 in the Label Set object; So No. 4 node generates a new Label Set object, and with λ 1, λ 4 puts in this object, and this newly-generated Label Set object is put in the Path message, and is last, No. 6 nodes send Path message downstream.

After step 5:6 node received the Path message of upstream, its discovery Label Set object had been specified a plurality of wavelength (λ 1, and λ 4).Second predetermined policy that can mention according to this patent is selected a wavelength.Suppose to have selected λ 4.No. 6 node generates a Label object, λ 4 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 6 node sends Resv message to No. 4 nodes.No. 6 nodes subtract 1 with the useful number of λ 4 in the wavelength available of Link46, and inundation again.

After step 6:4 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 4), can be according to certain strategy at available wavelength conversion capability λ 2--〉λ 4 and λ 3--〉select one among the λ 4, at this time should select the more wavelength of wavelength Conversion available capability, such as selecting λ 2--〉λ 4 or λ 2--〉λ 1 is (because select one of them, λ 2 still can be converted at this node), rather than λ 3--λ 4.Suppose to have selected λ 2--〉λ 4, No. 4 nodes generate a Label object so, and λ 2 is put into this Label object, and this Label object put into Resv message, at last, No. 4 node sends Resv message to No. 5 nodes, and configuration transmits the resource (such as ROADM or OXC) on plane.No. 4 nodes subtract 1 with the useful number of λ 4 in the wavelength available of Link46, and the available number of λ 2 in the wavelength available of Link54 is subtracted 1, and inundation again.With λ 2--in the wavelength conversion capability information between Link54 and the Link46〉λ 4 can subtract 1 with number, and inundation again.

After step 7:5 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 2), the resource on the transmission plane between configuration member's link Component Link25-2 and the Link54 (such as ROADM or OXC).No. 5 node generates a Label object, λ 2 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 5 node sends Resv message to No. 2 nodes.No. 5 nodes subtract 1 with the available number of λ 2 in the wavelength available of Link54, and the available number of the wavelength available λ 2 of harness link Bundled Link25 is subtracted 1 (last, also surplus wavelength available).

After step 8:2 node receives the Resv message in downstream, according to the specified wavelength of Label object (λ 2), the resource on the transmission plane between configuration member's link Component Link25-2 and the Link12 (such as ROADM or OXC).No. 2 node generates a Label object, λ 2 is put into this Label object, and this Label object is put into Resv message, and is last, and No. 2 node sends Resv message to No. 1 node.No. 5 nodes subtract 1 with the available number of λ 2 in the wavelength available of Link12, and the available number of the wavelength available λ 2 of harness link Bundled Link25 is subtracted 1 (last, also surplus wavelength available).

After step 9:1 node receives the Resv message in downstream,, revise the wavelength available information of Link12, λ 2 wavelength can be subtracted 1 with number according to the specified wavelength of Label object (λ 2), and inundation again.

As mentioned above,, provide and realized that in the harness link technology LSP sets up the scheme of process, filled up the blank of prior art by means of the tag changeable path path processing method based on link bundle provided by the invention.Adopt the present invention, solved the link bundle technology has been applied to the problem that wavelength switched optical network runs into, after particularly adopting the present invention to route agreement (OSPF-TE) expansion technique, no matter be to adopt distributed or centralized Wavelength Assignment, all solved the problem that the RWA entity need be known the wavelength constraint information and the wavelength available information of Member Link of carrying out well, provide standardized means for automatic wavelength switched optical network interconnects, keep the advantage of link bundle technology simultaneously.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (16)

1. the label switched path based on link bundle is the LSP processing method, it is characterized in that, comprising:

Route is calculated and the Wavelength Assignment entity determine described LSP via one or more harness links and one or more unbunding link;

Described route calculating and Wavelength Assignment entity are selected Member Link according to first predetermined policy from each harness link;

Described route calculating and Wavelength Assignment entity are determined wavelength that selected each Member Link and each unbunding link are used to transmit and the employed wavelength of node of determining described LSP process according to second predetermined policy in described LSP.

2. method according to claim 1 is characterized in that, described method also comprises:

Described route is calculated and the Wavelength Assignment entity is known the link bundle information that is used to support route calculating and Wavelength Assignment in all harness links in advance, wherein, described link bundle information comprises: the wavelength constraint information of harness link, the wavelength available information of harness link.

3. method according to claim 2, it is characterized in that, described route calculating and Wavelength Assignment entity obtain the wavelength constraint information of described harness link by the wavelength constraint information that calculates all Member Links in the harness link, wherein, the wavelength constraint information of described harness link is meant: the union of all wavelengths constraint information that all Member Links in the described harness link are supported.

4. method according to claim 2 is characterized in that,

Described route calculating and Wavelength Assignment entity obtain the wavelength available information of described harness link by the wavelength available information that calculates all Member Links in the harness link, wherein, the wavelength available information of described harness link is meant: the union of all the Member Link wavelength availables in the described harness link; And, but when a wavelength in equal time spent of a plurality of Member Links of described harness link, this wavelength useful number is that described this wavelength of a plurality of Member Link can be with the summation of number in the described harness link.

5. method according to claim 4 is characterized in that,

Setting up and removing in the process of described label switched path, if this label switched path the wavelength available supported of the Member Link in the described harness link of process occupied, then with occupied wavelength from all wavelength availables of described harness link and concentrate and remove, and make corresponding wavelength in the described harness link can reduce the number of described occupied wavelength with number;

Under the situation that finishes to take at described occupied wavelength, that the wavelength that described end is taken adds described all wavelengths to and concentrate, and make corresponding wavelength in the described harness link can increase the number of the wavelength that described end takies with number;

Under the situation that the wavelength available information of the Member Link in described harness link changes, recomputate the wavelength available information of described harness link, and inundation result of calculation, wherein, described result of calculation is the union of all Member Link wavelength available informations.

6. method according to claim 3 is characterized in that, when the Member Link wavelength constraint information in the described harness link changed, described method also comprised:

Recomputate the wavelength constraint information of described harness link, wherein, result calculated is the union of current all Member Link wavelength constraint informations;

The described wavelength constraint information that inundation recomputates.

7. method according to claim 2 is characterized in that, after having known described link bundle information, described method further comprises:

Described link bundle information is carried out inundation, if this link bundle information changes, the described link bundle information after inundation changes again.

8. method according to claim 2 is characterized in that, knows to be used to support route to calculate in all harness links and the mode of the link bundle information of Wavelength Assignment comprises one of following:

Described route is calculated and the Wavelength Assignment entity obtains described link bundle information by pre-configured mode;

Each node will link bundle information separately sends to described route and calculates and the Wavelength Assignment entity, and wherein, when link bundle information changed, described each node reconfigured or send after the variation link bundle information separately.

9. method according to claim 1 is characterized in that, described method also comprises:

Described route calculating and Wavelength Assignment entity are known the parameter information of all Member Links in advance, and wherein, described parameter information comprises: wavelength constraint information and wavelength available information that all Member Links that each harness link comprises, each Member Link are supported.

10. method according to claim 1 is characterized in that, described method also comprises:

Described route calculating and Wavelength Assignment entity obtain the parameter information of each node in advance, the parameter information of described each node that wherein, obtains comprise following one of at least: each harness link of intranodal and connectivity constraint information, wavelength conversion capability constraint information, the wavelength Conversion available information between other harness links; Connectivity constraint information, wavelength conversion capability constraint information, wavelength Conversion available information between described each harness link and the unbunding link; Connectivity constraint information, wavelength conversion capability constraint information, wavelength Conversion available information between the described intranodal unbunding link.

11. method according to claim 10 is characterized in that, the parameter information that obtains described each node comprises:

Described route calculating and Wavelength Assignment entity are by the connectivity constraint information between all Member Links and the unbunding link in the described harness link of calculating, the wavelength conversion capability constraint information, the wavelength Conversion available information, and the connectivity constraint information between the Member Link in all Member Links and other harness links in the described harness link, the wavelength conversion capability constraint information, the wavelength Conversion available information obtains the connectivity constraint information between described harness link and described other harness links, the wavelength conversion capability constraint information, the wavelength Conversion available information, and the connectivity constraint information between described harness link and the described unbunding link, the wavelength conversion capability constraint information, the wavelength Conversion available information;

Wherein, connectivity constraint information, wavelength conversion capability constraint information and the wavelength Conversion available information between described harness link and the described unbunding link is the union of connectivity constraint information, wavelength conversion capability constraint information and the wavelength Conversion available information between all Member Links and this unbunding link in this harness link; Connectivity constraint information, wavelength conversion capability constraint information and wavelength Conversion available information between described harness link and described other harness links is all Member Links in the described harness link and the union of connectivity constraint information, wavelength conversion capability constraint information and wavelength Conversion available information between all Member Links in described other harness links; And, but two wavelength are in the harness link between many Member Links and described other harness links and the time spent all of the wavelength Conversion between described many Member Links and the described unbunding link, this wavelength between described harness link and described other harness links and the wavelength Conversion useful number between described harness link and the described unbunding link be that wavelength Conversion can be with the summation of number between all Member Links and described other harness links and between described all Member Links and the described unbunding link in the described harness link.

12. method according to claim 11 is characterized in that, described route is calculated and the mode of the parameter information of described each node of Wavelength Assignment entity acquisition comprises one of following:

Described route calculating and Wavelength Assignment entity can also obtain the parameter information of described each node by pre-configured mode;

Each node will parameter information separately sends to described route and calculates and the Wavelength Assignment entity, and wherein, when parameter information changed, described each node reconfigured or send after the variation parameter information separately.

13. method according to claim 11 is characterized in that, also comprises:

Between Member Link in described harness link and described other harness links and the wavelength available transfer capability between described harness link and the described unbunding link is occupied or discharge after, recomputate the described wavelength available transfer capability information that takies or discharge, and inundation result of calculation, wherein, described result of calculation is in the described harness link between all Member Links and described other harness links and the union of the wavelength Conversion available information of described harness link and described unbunding link.

14., it is characterized in that it is one of following that described first predetermined policy comprises according to each described method in the claim 1 to 13:

In the harness link, select Member Link at random;

All available Member Links in the harness link are sorted according to predetermined policy, select the Member Link in precalculated position, ordering back;

According to the number of times that Member Link in the harness link was used, from available Member Link, select to be used the maximum Member Link of number of times;

From the harness link, select Member Link according to offered load.

15., it is characterized in that it is one of following that described second predetermined policy comprises according to each described method in the claim 1 to 13:

In the wavelength available of Member Link, select at random;

All wavelength availables to Member Link sort according to pre-defined rule, select the wavelength in precalculated position, ordering back;

According to the number of times that the Member Link medium wavelength was used, from wavelength available, select to be used the maximum wavelength of number of times;

Select from the wavelength available of Member Link according to offered load.

16., it is characterized in that described method is applied to the framework that following route calculating, Wavelength Assignment and Member Link selection combine according to each described method in the claim 1 to 13:

Centralized route is calculated+centralized Wavelength Assignment+centralized Member Link selection; Or

Centralized route is calculated+centralized Wavelength Assignment+distributed Member Link selection; Or

Centralized route calculating+distributed Wavelength Assignment+centralized Member Link is selected; Or

Centralized route calculating+distributed Wavelength Assignment+distributed Member Link is selected; Or

Distributed route calculating+distributed Wavelength Assignment+distributed Member Link is selected.

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