CN103957159B

CN103957159B - A kind of method and path-calculating element for determining label switched path

Info

Publication number: CN103957159B
Application number: CN201410169444.8A
Authority: CN
Inventors: 董雯霞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-04-24
Filing date: 2014-04-24
Publication date: 2017-08-11
Anticipated expiration: 2034-04-24
Also published as: CN103957159A

Abstract

A kind of method and path-calculating element for determining label switched path of the present invention, it is related to communication technical field, disclose a kind of determination LSP method and PCE, in this scenario, because the first PCE is setting up in request message the information for carrying the first object network equipment to the 2nd PCE paths sent, the identification information of Ingress Network equipment and the identification information of egress network equipment, and in the all-network equipment that the first object network equipment includes for first object path, the network equipment being connected with the network equipment in domain where the 2nd PCE, the second destination path can be determined by receiving path and setting up the 2nd PCE of request message, and the first PCE and the 2nd PCE are not limited, therefore, solve run on present in prior art the controller in SDN domains and run on conventional domain server coexist in the case of, the defect of the LSP between the server that runs on the controller in SDN domains and run on conventional domain can not be determined.

Description

A kind of method and path-calculating element for determining label switched path

Technical field

The present invention relates to communication technical field, more particularly to a kind of determination LSP method and PCE (Path Computation Element, path-calculating element).

Background technology

SDN (Software Defined Network, software defined network), is a kind of new network framework, its core Technology separates network equipment chain of command and data surface, realizes the flexible control of network traffics, be core network and should Innovation provides good platform.

There are two kind equipments in SDN：Controller and interchanger, wherein, controller is responsible for carrying out centralized Control to network, to friendship Change planes and issue flow table (flow table)；And each interchanger has a flow table to be used to carry out packet lookup and forwarding, such as Shown in Figure 1A.

In actual applications, the deployment of SDN framework is progressively to dispose stage by stage, and the short time can not possibly substitute biography completely The system network architecture, that is to say, that the controller for running on SDN domains can be with running on traditional domain server (chain of command and data surface Unseparated server) it can coexist, (deployment of controller single-point), (deployment of controller multiple spot) shown in Fig. 1 C as shown in Figure 1B, that There will be the LSP (Label between the server for setting up and running on the controller in SDN domains and running on conventional domain Switched Path, label switched path) the need for.

But, in the prior art, when need set up run on SDN domains controller and run on conventional domain server it Between LSP when, either controller is the start node that LSP is set up, and is also operate in what the server of conventional domain was set up for LSP Start node, start node does not know the network equipment being connected in this domain with the network equipment in domain where opposite end, therefore, nothing Method sets up LSP, therefore, exists run on what the controller in SDN domains coexisted with running on the server of conventional domain in the prior art In the case of can not set up LSP defect.

The content of the invention

The embodiment of the present invention provides a kind of determination LSP method and PCE, to solve to run on present in prior art The controller in SDN domains can not determine LSP defect with running in the case that the server of conventional domain coexists.

Concrete technical scheme provided in an embodiment of the present invention is as follows：

First aspect there is provided it is a kind of determine label switching path LSP method, including：

RX path sets up request message, wherein, request message is set up in the path includes Tag switching to be determined Identification information, the identification information of egress network equipment of Ingress Network equipment in the LSP of path；

When determining that the egress network equipment is located at outside the domain of first path computing unit PCE places, according to the entrance The first object path in domain where the identification information of the network equipment determines the first PCE, wherein, the first object path is A part in the LSP to be determined；

In the all-network equipment that the first object path is included, it is connected with the network equipment in domain where the 2nd PCE The network equipment, be used as the first object network equipment；

The attribute information of the first object network equipment, the identification information of the Ingress Network equipment and described will be carried The path of the identification information of egress network equipment is set up request message and sent to the 2nd PCE, to cause the 2nd PCE according to institute State the mark of the attribute information, the identification information of the Ingress Network equipment and the egress network equipment of the first object network equipment Know second destination path in domain where information determines the 2nd PCE；Wherein, the LSP to be determined includes first mesh Mark path and second destination path.

With reference in a first aspect, in the first possible implementation, request message is set up for path computing in the path Request message PCReq.

With reference in a first aspect, or first aspect the first possible implementation, second of possible realization side In formula, the attribute information of the first object network equipment includes the internet of the exterior chain interface of the first object network equipment Protocol IP address.

With reference in a first aspect, or first aspect the first to second possible implementation, it is possible at the third In implementation, domain where the first PCE is software defined network SDN domains, and the first PCE runs on the SDN controls On device；Domain is conventional domain where 2nd PCE, and the 2nd PCE is run on server or routing device；Or,

Domain is conventional domain where first PCE, and the first PCE is run on server or routing device；Described Domain is SDN domains where two PCE, and the 2nd PCE is run on the SDN controllers.

With reference in a first aspect, or first aspect first to the third possible implementation, it is possible at the 4th kind In implementation, by carry the attribute information of the first object network equipment, the Ingress Network equipment identification information Request message is set up with the path of the identification information of the egress network equipment to send to the 2nd PCE, to cause the 2nd PCE Set according to the attribute information of the first object network equipment, the identification information of the Ingress Network equipment and the egress network After second destination path in domain where standby identification information determines the 2nd PCE, in addition to：

If the first PCE is run on the SDN controllers, the 2nd PCE is run on server or routing device, lead to The all-network equipment that cross control passage includes to the first object path sends corresponding label respectively.

Second aspect there is provided a kind of method for determining label switched path LSP, including：

Receive attribute information, the Ingress Network for the carrying first object network equipment that first path computing unit PCE is sent Request message is set up in the path of the identification information of equipment and the identification information of egress network equipment, wherein, the path is set up please It is the first PCE it is determined that the first object path in domain where the first PCE to seek message, and is included from the first object path All-network equipment in determine hair after the first object network equipment that be connected of the network equipment with domain where the 2nd PCE Send；

According to the attribute information of the first object network equipment, the identification information of the Ingress Network equipment and it is described go out Second destination path in domain where the identification information of the mouth network equipment determines the 2nd PCE, wherein, the LSP to be determined Including the first object path and second destination path.

With reference to second aspect, in the first possible implementation, request message is set up for path computing in the path Request message PCReq.

With reference to the first possible implementation of second aspect, or second aspect, second of possible realization side In formula, the attribute information of the first object network equipment includes the internet of the exterior chain interface of the first object network equipment Protocol IP address.

With reference to second of possible implementation of second aspect, in the third possible implementation, according to described The mark of the attribute information of the first object network equipment, the identification information of the Ingress Network equipment and the egress network equipment Second destination path in domain, is specifically included where information determines the 2nd PCE：

Determine the exterior chain for the first object network equipment that the attribute information of the first object network equipment includes The network segment of the IP address of interface；

Second destination network device is determined according to the network segment, second destination network device is the 2nd PCE institutes There is the network equipment of the identical network segment in domain with the network segment；

According to second destination network device, the identification information of the Ingress Network equipment and the egress network equipment Identification information determine the 2nd PCE where domain the second destination path.

With reference to second aspect, or second aspect first to the third possible implementation, it is possible at the 4th kind In implementation, domain where the first PCE is software defined network SDN domains, and the first PCE runs on the SDN controls On device；Domain is conventional domain where 2nd PCE, and the 2nd PCE is run on server or routing device；Or,

It is possible at the 5th kind with reference to first to fourth kind of possible implementation of second aspect, or second aspect In implementation, the attribute information according to the first object network equipment, the identification information of the Ingress Network equipment and After second destination path in domain where the identification information of the egress network equipment determines the 2nd PCE, in addition to：

If the 2nd PCE is run on the SDN controllers, the first PCE is run on server or routing device, lead to The all-network equipment that cross control passage includes to second destination path sends corresponding label respectively.

It is possible at the 6th kind with reference to first to the 5th kind of possible implementation of second aspect, or second aspect In implementation, attribute information, the entrance of the carrying first object network equipment that first path computing unit PCE is sent are being received The path of the identification information of the network equipment and the identification information of egress network equipment is set up after request message, in addition to：

When determining that the egress network equipment is located at outside the domain of the 2nd PCE places, by the second destination path bag In the all-network equipment included, the network equipment being connected with the network equipment in domain where the 3rd PCE is used as the 3rd target network Network equipment；

Information, the identification information of the Ingress Network equipment and the outlet of the 3rd destination network device will be carried The path of the identification information of the network equipment is set up request message and sent to the 3rd PCE, to cause the 3rd PCE according to described The mark letter of the attribute information of three destination network devices, the identification information of the Ingress Network equipment and the egress network equipment 3rd destination path in domain where breath determines the 3rd PCE；Wherein, the LSP to be determined also includes the 3rd target Path.

With reference to the 6th kind of possible implementation of second aspect, in the 7th kind of possible implementation, the described 3rd Domain is conventional domain where PCE, and the 3rd PCE is run on server or routing device；Or

Domain is SDN domains where 3rd PCE, and the 3rd PCE is run on the SDN controllers.

The third aspect there is provided a kind of first path computing unit PCE, including：

Receiving unit, request message is set up for RX path, wherein, request message is set up in the path to be included treating really Identification information, the identification information of egress network equipment of Ingress Network equipment in fixed label switching path LSP；

First determining unit, during for determining that the egress network equipment is located at outside the domain of the first PCE places, according to described The first object path in domain where the identification information of Ingress Network equipment determines the first PCE, wherein, the first object road Footpath is the part in the LSP to be determined；

Second determining unit, in the all-network equipment that includes the first object path, and where the 2nd PCE The network equipment of the network equipment connection in domain, is defined as the first object network equipment；

Transmitting element, for the attribute information of the first object network equipment, the Ingress Network equipment will to be carried The path of identification information and the identification information of the egress network equipment is set up request message and sent to the 2nd PCE, to cause The 2nd PCE is stated according to the attribute information of the first object network equipment, the identification information of the Ingress Network equipment and described Second destination path in domain where the identification information of egress network equipment determines the 2nd PCE；Wherein, it is described to be determined LSP includes the first object path and second destination path.

With reference to the third aspect, in the first possible implementation, the path that the receiving unit is received is set up please Message is sought for path computing request message PCReq, and/or request message is set up for PCReq in the path that the transmitting element is sent.

With reference to the first possible implementation of the third aspect, or the third aspect, second of possible realization side In formula, the attribute information for the first object network equipment that second determining unit is determined is set including the first object network The internet protocol address of standby exterior chain interface.

It is possible at the third with reference to the first to second possible implementation of the third aspect, or the third aspect In implementation, domain where the first PCE is software defined network SDN domains, and the first PCE runs on the SDN controls On device；Domain is conventional domain where 2nd PCE, and the 2nd PCE is run on server or routing device；Or,

With reference to the third aspect, or the third aspect first to the third possible implementation, it is possible at the 4th kind In implementation, the transmitting element is additionally operable to：

If the first PCE is run on the SDN controllers, the 2nd PCE runs on server or routing device On, the all-network equipment included by control passage to the first object path sends corresponding label respectively.

Fourth aspect there is provided the 2nd PCE of one kind, including：

Receiving unit, attribute information, Ingress Network for receiving the carrying first object network equipment that the first PCE is sent Request message is set up in the path of the identification information of equipment and the identification information of egress network equipment, wherein, the path is set up please It is the first PCE it is determined that the first object path in domain where the first PCE to seek message, and is included from the first object path All-network equipment in determine the first object network equipment that is connected of the network equipment with domain where the 2nd PCE Send afterwards；

Determining unit, for the attribute information according to the first object network equipment, the mark of the Ingress Network equipment Second destination path in domain where the identification information of knowledge information and the egress network equipment determines the 2nd PCE, wherein, institute Stating LSP to be determined includes the first object path and second destination path.

With reference to fourth aspect, in the first possible implementation, the path that the receiving unit is received is set up please It is path computing request message PCReq to seek message.

With reference to the first possible implementation of fourth aspect, or fourth aspect, second of possible realization side In formula, the attribute information of the first object network equipment used in the determining unit includes the first object network equipment The internet protocol address of exterior chain interface.

With reference to second of possible implementation of fourth aspect, in the third possible implementation, determination is stated single Member is additionally operable to：

With reference to fourth aspect, or fourth aspect first to the third possible implementation, it is possible at the 4th kind In implementation, domain where the first PCE is software defined network SDN domains, and the first PCE runs on the SDN controls On device；Domain is conventional domain where 2nd PCE, and described second runs on server or routing device；Or,

It is possible at the 5th kind with reference to first to fourth kind of possible implementation of fourth aspect, or fourth aspect In implementation, in addition to transmitting element, the transmitting element is used for：

If the first PCE is run on the SDN controllers, the 2nd PCE runs on server or routing device On, the all-network equipment included by control passage to second destination path sends corresponding label respectively.

It is possible at the 6th kind with reference to first to the 5th kind of possible implementation of fourth aspect, or fourth aspect In implementation, the determining unit is additionally operable to：

With reference to the 6th kind of possible implementation of fourth aspect, in the 7th kind of possible implementation, the described 3rd Domain is conventional domain where PCE, and the 3rd PCE is run on server or routing device；Or

The present invention has the beneficial effect that：

In the prior art, in the case where the controller for running on SDN domains and the server for running on conventional domain coexist, nothing By start node of the controller in SDN domains for LSP is operate in, the server for being also operate in conventional domain is LSP starting section Point, start node does not know the network equipment being connected in this domain with the network equipment in domain where opposite end, therefore, it is impossible to determine LSP, and then LSP can not be set up.And in the embodiment of the present invention, it is determined that during LSP, RX path sets up request message, wherein, road Request message is set up in footpath includes identification information, the outlet net of the Ingress Network equipment in label switching path LSP to be determined The identification information of network equipment；It is determined that when the outlet network equipment is located at outside the domain of first path computing unit PCE places, according to entrance The first object path in domain where the identification information of the network equipment determines the first PCE, wherein, first object path is to be determined A part in LSP；In the all-network equipment that first object path is included, connect with the network equipment in domain where the 2nd PCE The network equipment connect, is used as the first object network equipment；The attribute information, the Ingress Network that carry the first object network equipment are set Standby identification information and the path of the identification information of egress network equipment are set up request message and sent to the 2nd PCE, to cause Two PCE are according to the mark of the attribute information, the identification information of Ingress Network equipment and egress network equipment of the first object network equipment Know second destination path in domain where information determines the 2nd PCE；Wherein, LSP to be determined includes first object path and second Destination path, in this scenario, because the first PCE carries the first mesh being set up to the 2nd PCE paths sent in request message Mark the identification information of the information of the network equipment, the identification information of Ingress Network equipment and egress network equipment, and first object net In the all-network equipment that network equipment includes for first object path, the network being connected with the network equipment in domain where the 2nd PCE Equipment, the second destination path can be determined by receiving path and setting up the 2nd PCE of request message, and the first PCE and the 2nd PCE are equal Do not limit, therefore, solve the controller that SDN domains are run on present in prior art and the server for running on conventional domain In the case of coexisting, it is impossible to it is determined that run on the controller in SDN domains and run on conventional domain server between LSP lack Fall into.

Brief description of the drawings

Figure 1A is the schematic diagram for the controller for running on SDN domains in the prior art；

Figure 1B is the schematic diagram for the controller single-point deployment for running on SDN domains in the prior art；

Fig. 1 C are the schematic diagram for the controller multiple spot deployment for running on SDN domains in the prior art；

A kind of detail flowchart that Fig. 2A is determination LSP in the embodiment of the present invention；

Fig. 2 B are the schematic diagram in first object path in the embodiment of the present invention；

Another detail flowchart that Fig. 3 A are determination LSP in the embodiment of the present invention；

Fig. 3 B are the schematic diagram of the second destination path in the embodiment of the present invention；

The schematic device for the first embodiment that Fig. 4 A are determination LSP in the embodiment of the present invention；

The schematic flow sheet for the first embodiment that Fig. 4 B are determination LSP in the embodiment of the present invention；

The schematic device for the second embodiment that Fig. 5 A are determination LSP in the embodiment of the present invention；

The schematic flow sheet for the second embodiment that Fig. 5 B are determination LSP in the embodiment of the present invention；

The illustrative view of functional configuration that Fig. 6 A are the first PCE in the embodiment of the present invention；

The entity apparatus structural representation that Fig. 6 B are the first PCE in the embodiment of the present invention；

The illustrative view of functional configuration that Fig. 7 A are the 2nd PCE in the embodiment of the present invention；

The entity apparatus structural representation that Fig. 7 B are the 2nd PCE in the embodiment of the present invention.

Embodiment

To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The all other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.

The terms "and/or", only a kind of incidence relation for describing affiliated partner, represents there may be three kinds of passes System, for example, A and/or B, can be represented：Individualism A, while there is A and B, these three situations of individualism B.In addition, herein Middle character "/", it is a kind of relation of "or" to typically represent forward-backward correlation object.

Coexisted to solve to run on the controller in SDN domains present in prior art with running on the server of conventional domain In the case of, it is impossible to it is determined that run on the controller in SDN domains and run on conventional domain server between LSP defect, this In inventive embodiments, propose in a kind of determination LSP method, the program, in this scenario, because the first PCE is to the 2nd PCE The path of transmission is set up in request message the information for carrying the first object network equipment, the identification information of Ingress Network equipment and gone out The identification information of the mouth network equipment, and in the all-network equipment that the first object network equipment includes for first object path, with The network equipment of the network equipment connection in domain where the 2nd PCE, receiving path and setting up the 2nd PCE of request message to determine Second destination path, and the first PCE and the 2nd PCE are not limited, therefore, are solved and are run on present in prior art The controller in SDN domains and run on conventional domain server coexist in the case of can not determine to run on the controller in SDN domains with The LSP run between the server of conventional domain defect.

The preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

Refering to shown in Fig. 2A, a kind of method for determining LSP is provided in the embodiment of the present invention, this method embodiment flow is such as Under：

Step 200：RX path sets up request message, wherein, request message is set up in path to be included in LSP to be determined Ingress Network equipment identification information, the identification information of egress network equipment；

Step 210：It is determined that when the outlet network equipment is located at outside the domain of first path computing unit PCE places, according to entrance The first object path in domain where the identification information of the network equipment determines the first PCE, wherein, first object path is to be determined A part in LSP；

Step 220：In the all-network equipment that first object path is included, the network equipment with domain where the 2nd PCE The network equipment of connection, is used as the first object network equipment；

Step 230：Attribute information, the identification information of Ingress Network equipment and the outlet of the first object network equipment will be carried The path of the identification information of the network equipment is set up request message and sent to the 2nd PCE, to cause the 2nd PCE according to first object net The identification information of the attribute information of network equipment, the identification information of Ingress Network equipment and egress network equipment determines the 2nd PCE institutes The second destination path in domain；Wherein, LSP to be determined includes first object path and the second destination path.

During the present invention is implemented, the English description of Ingress Network equipment has a variety of, optionally, can be described as ingress, when So, in actual applications, there are other describing modes, be no longer described in detail one by one herein.

Similarly, the English description of egress network equipment also has a variety of, optionally, can be described as egress, actually should In, there are other describing modes, be no longer described in detail one by one herein.

In the embodiment of the present invention, request message is set up in path diversified forms, optionally, and path sets up request message and is PCReq (Path Computation Request Message, path computing request message).

In the embodiment of the present invention, determine that first object network is set in the all-network equipment included from first object path Standby mode has a variety of, optionally, can be in the following way：

The network equipment that will be connected in all-network equipment with the network equipment in domain where the 2nd PCE, is used as first object The network equipment.

As shown in Figure 2 B, the first PCE is run on the controller in SDN domains, when S1 is in the first object path determined, Now network equipment D3 is connected with running on the network equipment of conventional domain, then the first object network equipment is network equipment D3, When the first object path determined is S2, now network equipment D6 is connected with running on the server of conventional domain, then the first mesh The mark network equipment is network equipment D6.

In actual applications, first object path is determined, or determines the technology that the second destination path is comparative maturity, This is no longer described in detail one by one.

In the embodiment of the present invention, the form of the attribute information of the first object network equipment has a variety of, it may for example comprise the first mesh Mouth IP (Internet Protocol, Internet protocol) address of the outer link of the network equipment is marked, it is, of course, also possible to including it His form, is no longer described in detail one by one herein.

Wherein, exterior chain interface is to run in the network equipment in the first PCE places domain and run on domain where the 2nd PCE The connected interface of the network equipment.

In the embodiment of the present invention, optionally, domain is SDN domains where the first PCE, and the first PCE is run on SDN controllers； Domain is conventional domain where 2nd PCE, and the 2nd PCE is run on server or routing device；Or,

Domain is conventional domain where first PCE, and the first PCE is run on server or routing device；Domain where 2nd PCE is SDN domains, the 2nd PCE is run on SDN controllers.

Certainly, the first PCE, the 2nd PCE can also be run on server or routing device simultaneously, now, the first PCE institutes The domain where domain, the 2nd PCE is conventional domain；Or, the first PCE, the 2nd PCE can also be run on SDN controllers simultaneously, Now, domain where domain, the 2nd PCE where the first PCE is SDN domains.

In actual applications, the agreement of controller operation has PCE agreements, also has the network in other legacy protocols, this domain Operation performed by equipment is all completed under the control of the controller, and running on only allows PCE on the server of conventional domain Agreement, other agreements are to run on operation, such as RSVP (Resource Reservation on the network equipment in conventional domain Protocol, RSVP).

In actual applications, it is determined that after LSP, to set up LSP, now, to be set to the route in the destination path of determination Back-up issue of bidding documents label, therefore, in the embodiment of the present invention, set by the attribute information, the Ingress Network that carry the first object network equipment Standby identification information and the path of the identification information of egress network equipment are set up request message and sent to the 2nd PCE, to cause Two PCE are according to the mark of the attribute information, the identification information of Ingress Network equipment and egress network equipment of the first object network equipment After the second destination path for knowing domain where information determines the 2nd PCE, in addition to following operation：

It is logical by control if the first PCE is run on SDN controllers, the 2nd PCE is run on server or routing device The all-network equipment that road includes to first object path sends corresponding label respectively.

In the embodiment of the present invention, if it is in SDN domains that LSP Ingress Network equipment, which is run on, then triggering LSP is determined Main body can be APP (ApplicationProgram, the application program) triggerings run on the controller in SDN domains, also may be used Be Ingress Network equipment triggering；If LSP Ingress Network equipment run on be can be Ingress Network equipment in conventional domain Triggering, it is, of course, also possible to there is other trigger conditions, is no longer described in detail herein.

In the embodiment of the present invention, the network equipment run in SDN domains can as LSP Ingress Network equipment, also may be used Using the intermediary network device as LSP, LSP egress network equipment, similarly, the network run in conventional domain are also used as Equipment can as LSP Ingress Network equipment, can also as LSP intermediary network device, be also used as LSP outlet The network equipment.

Refering to shown in Fig. 3 A, another method for determining LSP is provided in the embodiment of the present invention, this method embodiment flow is such as Under：

Step 300：Receive attribute information, the Ingress Network equipment of the carrying first object network equipment of the first PCE transmissions Identification information and the path of identification information of egress network equipment set up request message, wherein, request message is set up in path is First PCE is it is determined that in the first object path in domain where the first PCE, and the all-network equipment included from first object path Determine what is sent after the first object network equipment being connected with the network equipment in domain where the 2nd PCE；

Step 310：According to the attribute information of the first object network equipment, the identification information of Ingress Network equipment and outlet net Second destination path in domain where the identification information of network equipment determines the 2nd PCE, wherein, LSP to be determined includes first object Path and the second destination path.

In the embodiment of the present invention, request message is set up in path diversified forms, optionally, and path sets up request message and is PCRep message.

In the embodiment of the present invention, the form of the attribute information of the first object network equipment has a variety of, it may for example comprise the first mesh The IP address of the exterior chain interface of the network equipment is marked, it is, of course, also possible to including other forms, be no longer described in detail one by one herein.

In the embodiment of the present invention, according to the attribute information of the first object network equipment, the identification information of Ingress Network equipment The mode of second destination path in domain has a variety of where determining the 2nd PCE with the identification information of egress network equipment, optionally, can With in the following way：

Determine the IP of the exterior chain interface for the first object network equipment that the attribute information of the first object network equipment includes The network segment of address；

Second destination network device is determined according to the network segment, the second destination network device be in domain where the 2nd PCE with the network segment The network equipment with the identical network segment；

It is true according to the identification information of the second destination network device, the identification information of Ingress Network equipment and egress network equipment Second destination path in domain where fixed 2nd PCE.

For example, as shown in Figure 3 B, if the first object network equipment that the first PCE is determined is network equipment D3, then the The network segment of the IP address for the exterior chain interface that two PCE include according to network equipment D3 attribute information, determines the 2nd PCE places The second destination network device being connected in domain with network equipment D3 is network equipment E1, wherein, network equipment E1 is second The network segment of the IP address of the exterior chain interface included in domain where PCE with network equipment D3 attribute information has the identical network segment The network equipment, it is then, true according to network equipment E1, network equipment D1 identification information and egress network equipment identification information The fixed optimal path using network equipment E1 as starting point, regard the optimal path using network equipment E1 as starting point determined as second Destination path, determines the technology that optimal path is this area comparative maturity, is no longer described in detail one by one herein.

As shown in Figure 3 B, the second destination path includes three network equipments：Network equipment E1, network equipment E2, net Network equipment E3.

During the present invention is implemented, domain is software defined network SDN domains where the first PCE, and the first PCE runs on SDN controllers On；Domain is conventional domain where 2nd PCE, and the 2nd PCE is run on server or routing device；Or,

In actual applications, the agreement of controller operation has PCE agreements, also has the network in other legacy protocols, this domain Operation performed by equipment is all completed under the control of the controller, and running on only allows PCE on the server of conventional domain Agreement, other agreements are to run on operation, such as RSVP on the network equipment in conventional domain.

In actual applications, it is determined that after LSP, to set up LSP, now, to be set to the route in the destination path of determination Back-up issue of bidding documents label, therefore, in the embodiment of the present invention, in the attribute information according to the first object network equipment, Ingress Network equipment Identification information and egress network equipment identification information determine second destination path in domain where the 2nd PCE after, in addition to Following operation：

It is logical by control if the 2nd PCE is run on SDN controllers, the first PCE is run on server or routing device The all-network equipment that road includes to the second destination path sends corresponding label respectively.

Certainly, in actual applications, whole LSP end Network equipment may not be in the domain where the 2nd PCE, In domain where three PCE, therefore, in the embodiment of the present invention, the mesh of carrying first that first path computing unit PCE is sent is being received The path for marking the identification information of the attribute information, the identification information of Ingress Network equipment and egress network equipment of the network equipment is set up After request message, in addition to following operation：

It is determined that when the outlet network equipment is located at outside the domain of the 2nd PCE places, the all-network that the second destination path is included In equipment, the network equipment being connected with the network equipment in domain where the 3rd PCE is used as the 3rd destination network device；

The mark of information, the identification information of Ingress Network equipment and the egress network equipment of the 3rd destination network device will be carried The path of knowledge information is set up request message and sent to the 3rd PCE, to cause the 3rd PCE according to the attribute of the 3rd destination network device 3rd mesh in domain where the identification information of information, the identification information of Ingress Network equipment and egress network equipment determines the 3rd PCE Mark path；Wherein, LSP to be determined also includes the 3rd destination path.

The above-mentioned situation for simply teaching egress network equipment positioned at domain where the 3rd PCE, in actual applications, exports net Network equipment is also possible in domain where being located at domain where the 4th PCE, or the 5th PCE ... ..., now, any one go-between The implementation procedure of equipment can use said process, be no longer described in detail one by one herein.

Embodiment, concrete application scene given below, the process determined for LSP, make for a better understanding of the present invention Go out to be described in further detail, schematic device specifically as shown in Figure 4 A, flow chart specifically as shown in Figure 4 B, wherein, run on SDN The network equipment in domain is LSP Ingress Network equipment：

Step 400：The first PCE RX paths run on controller set up request message；

In the step, path sets up request message and sets up in request message and take for APP triggerings on controller, and the path Identification information, the egress network of Ingress Network equipment D1 in Problem with Some Constrained Conditions and corresponding strategy, and carrying LSP to be determined is set Standby E2 identification information.

Step 410：When first PCE determines that outlet network equipment E2 is located at outside SDN domains, according to Ingress Network equipment D1's Identification information determines the optimal path in this domain, i.e. first object path (S1), and the network that first object path is included With running on network equipment D3 that the routing device of conventional domain is connected as the first object network equipment in equipment；

Step 420：First PCE will carry network equipment D3 attribute information, Ingress Network equipment D1 identification information and The path of egress network equipment E2 identification information is set up request message and sent to the 2nd PCE；

Step 430：2nd PCE determines the net of the IP address for the exterior chain interface that network equipment D3 attribute information includes Section；

Step 440：2nd PCE is by the IP of the exterior chain interface included in conventional domain with network equipment D3 attribute information The network segment of location has the network equipment E1 of the identical network segment as the second destination network device；

Step 450：2nd PCE is according to the second destination network device E1, Ingress Network equipment D1 identification information and outlet Network equipment E2 identification information determines the second destination path (H1) of conventional domain.

In this embodiment, LSP includes first object path and the second destination path

The first PCE that what above-described embodiment was told about be operate on controller is sent out to the 2nd PCE run on server Send the scheme of path request message, certainly, in actual applications or, the 2nd PCE run on server is to operation In the first PCE transmitting path request messages on controller, implementation procedure is similar with said process, no longer carries out herein detailed one by one State.

Embodiment, concrete application scene given below, the process for determining LSP, make for a better understanding of the present invention Go out to be described in further detail, schematic device specifically as shown in Figure 5A, flow chart specifically as shown in Figure 5 B, wherein, Ingress Network Equipment is located at the first SDN domains, and egress network equipment is located at the 2nd SDN domains：

Step 500：The first PCE RX paths run on controller set up request message；

In the step, path sets up request message and sets up in request message and take for APP triggerings on controller, and the path Identification information, the egress network of Ingress Network equipment D1 in Problem with Some Constrained Conditions and corresponding strategy, and carrying LSP to be determined is set Standby F2 identification information..

Step 510：When first PCE determines that outlet network equipment E2 is located at outside SDN domains, according to Ingress Network equipment D1's Identification information determines the optimal path in this domain, i.e. first object path (S1), and the network that first object path is included With running on network equipment D3 that the routing device of conventional domain is connected as the first object network equipment in equipment；

Step 520：First PCE will carry network equipment D3 attribute information, Ingress Network equipment D1 identification information and The path of egress network equipment F2 identification information is set up request message and sent to the 2nd PCE；

Step 530：2nd PCE determines the net of the IP address for the exterior chain interface that network equipment D3 attribute information includes Section, has identical net by the network segment of the IP address of the exterior chain interface included in conventional domain with network equipment D3 attribute information The network equipment E1 of section is used as the second destination network device；

Step 540：2nd PCE is according to the second destination network device E1, Ingress Network equipment D1 identification information and outlet Network equipment F2 identification information determines the second destination path (H1) of conventional domain；

Step 550：Set in the network equipment that 2nd PCE includes the second destination path with running on the route of conventional domain Standby connected network equipment E2 is as the 3rd destination network device, and attribute information, the entrance that will carry the 3rd network equipment E2 The path of network equipment D1 identification information and egress network equipment F2 identification information is set up request message and sent to the 3rd PCE；

Step 560：3rd PCE, which will carry the 3rd network equipment E2 attribute information, Ingress Network equipment D1 mark, to be believed The path of breath and egress network equipment F2 identification information sets up request message and determines the 3rd destination path.

In this embodiment, LSP includes first object path, the second destination path and the 3rd destination path.

Based on above-mentioned technical proposal, refering to shown in Fig. 6 A, the embodiment of the present invention provides one kind the first PCE, the first PCE bags Receiving unit 60, the first determining unit 61, the second determining unit 62, and transmitting element 63 are included, wherein：

Receiving unit 60, request message is set up for RX path, wherein, path set up request message include it is to be determined LSP in Ingress Network equipment identification information, the identification information of egress network equipment；

First determining unit 61, during for determining that the outlet network equipment is located at outside the domain of the first PCE places, according to entrance net The first object path in domain where the identification information of network equipment determines the first PCE, wherein, first object path is to be determined A part in LSP；

Second determining unit 62, in the all-network equipment that includes first object path, with domain where the 2nd PCE The network equipment connection the network equipment, be defined as the first object network equipment；

Transmitting element 63, believes for will carry the attribute information of the first object network equipment, the mark of Ingress Network equipment The path of breath and the identification information of egress network equipment is set up request message and sent to the 2nd PCE, to cause the 2nd PCE according to the The identification information of the attribute information of one destination network device, the identification information of Ingress Network equipment and egress network equipment determines Second destination path in domain where two PCE；Wherein, LSP to be determined includes first object path and the second destination path.

In the embodiment of the present invention, optionally, request message is set up for PCReq in the path that receiving unit 60 is received, and/or Request message is set up for PCReq in the path that transmitting element is sent.

In the embodiment of the present invention, optionally, the attribute information for the first object network equipment that the second determining unit is determined The internet protocol address of exterior chain interface including the first object network equipment.

In the embodiment of the present invention, optionally, domain is software defined network SDN domains where the first PCE, and the first PCE is run on On SDN controllers；Domain is conventional domain where 2nd PCE, and the 2nd PCE is run on server or routing device；Or,

In the embodiment of the present invention, further, transmitting element 63 is additionally operable to：

As shown in Figure 6B, it is another first PCE provided in an embodiment of the present invention structure chart, the first PCE is included at least One processor 601, communication bus 602, memory 603 and at least one communication interface 604.

Wherein, communication bus 602 is used to realizing connection and communication between said modules, communication interface 604 be used for it is outer Portion's equipment is connected and communicated.

Wherein, memory 603 is used to store the program code for needing to perform, and these program codes can specifically include：Connect Unit 6031, the first determining unit 6032, the second determining unit 6033 and transmitting element 6034 are received, when said units are by processor During 601 execution, implement function such as：

Receiving unit 6031, request message is set up for RX path, wherein, request message is set up in path to be included treating really Identification information, the identification information of egress network equipment of Ingress Network equipment in fixed LSP；

First determining unit 6032, during for determining that the outlet network equipment is located at outside the domain of the first PCE places, according to entrance The first object path in domain where the identification information of the network equipment determines the first PCE, wherein, first object path is to be determined A part in LSP；

Second determining unit 6033, in the all-network equipment that includes first object path, and where the 2nd PCE The network equipment of the network equipment connection in domain, is defined as the first object network equipment；

Transmitting element 6034, for by carry the attribute information of the first object network equipment, Ingress Network equipment mark The path of the identification information of information and egress network equipment is set up request message and sent to the 2nd PCE, with cause the 2nd PCE according to The identification information of the attribute information of the first object network equipment, the identification information of Ingress Network equipment and egress network equipment is determined Second destination path in domain where 2nd PCE；Wherein, LSP to be determined includes first object path and the second destination path.

Based on above-mentioned technical proposal, refering to shown in Fig. 7 B, the embodiment of the present invention also provides one kind the 2nd PCE, the 2nd PCE Including receiving unit 70, determining unit 71, wherein：

Receiving unit 70, attribute information, entrance net for receiving the carrying first object network equipment that the first PCE is sent Request message is set up in the path of the identification information of network equipment and the identification information of egress network equipment, wherein, request is set up in path Message is the first PCE it is determined that the first object path in domain where the first PCE, and the all-network included from first object path Determine what is sent after the first object network equipment being connected with the network equipment in domain where the 2nd PCE in equipment；

Determining unit 71, for the attribute information according to the first object network equipment, the identification information of Ingress Network equipment Second destination path in domain where determining the 2nd PCE with the identification information of egress network equipment, wherein, LSP to be determined includes First object path and the second destination path.

In the embodiment of the present invention, optionally, request message is set up for PCReq in the path that receiving unit 70 is received.

In the embodiment of the present invention, optionally, the attribute information bag of the first object network equipment used in determining unit 71 Include the IP address of the exterior chain interface of the first object network equipment.

In the embodiment of the present invention, further, determining unit 71 is additionally operable to：

In the embodiment of the present invention, optionally, domain is software defined network SDN domains where the first PCE, and the first PCE is run on On SDN controllers；Domain is conventional domain where 2nd PCE, and second runs on server or routing device；Or,

In the embodiment of the present invention, further, in addition to transmitting element 72, transmitting element 72 is used for：

It is logical by control if the first PCE is run on SDN controllers, the 2nd PCE is run on server or routing device The all-network equipment that road includes to the second destination path sends corresponding label respectively.

In the embodiment of the present invention, optionally, domain is conventional domain where the 3rd PCE, and the 3rd PCE runs on server or route In equipment；Or

Domain is SDN domains where 3rd PCE, and the 3rd PCE is run on SDN controllers.

As shown in Figure 7 B, it is another 2nd PCE provided in an embodiment of the present invention structure chart, the 2nd PCE is included at least One processor 701, communication bus 702, memory 703 and at least one communication interface 704.

Wherein, communication bus 702 is used to realizing connection and communication between said modules, communication interface 704 be used for it is outer Portion's equipment is connected and communicated.

Wherein, memory 703 is used to store the program code for needing to perform, and these program codes can specifically include：Connect Unit 7031, determining unit 7032 and transmitting element 7033 are received, when said units are performed by processor 701, following work(is realized Energy：

Receiving unit 7031, attribute information, entrance for receiving the carrying first object network equipment that the first PCE is sent Request message is set up in the path of the identification information of the network equipment and the identification information of egress network equipment, wherein, path is set up please It is the first PCE it is determined that the first object path in domain where the first PCE to seek message, and all nets included from first object path Determine what is sent after the first object network equipment being connected with the network equipment in domain where the 2nd PCE in network equipment；

Determining unit 7032, the mark for the attribute information according to the first object network equipment, Ingress Network equipment is believed Second destination path in domain where breath and the identification information of egress network equipment determine the 2nd PCE, wherein, LSP bags to be determined Include first object path and the second destination path；

Transmitting element 7033, if running on SDN controllers, the 2nd PCE for the first PCE runs on server or route In equipment, the all-network equipment included by control passage to the second destination path sends corresponding label respectively.

In summary, in the embodiment of the present invention, propose in a kind of method for setting up LSP, the program, it is determined that during LSP, connecing Receive path and set up request message, wherein, request message is set up in path includes the entrance in label switching path LSP to be determined Identification information, the identification information of egress network equipment of the network equipment；It is determined that the outlet network equipment, which is located at first path, calculates single When outside domain where first PCE, the first object path in domain according to where the identification information of Ingress Network equipment determines the first PCE, Wherein, first object path is the part in LSP to be determined；In the all-network equipment that first object path is included, The network equipment being connected with the network equipment in domain where the 2nd PCE, is used as the first object network equipment；First object net will be carried Request is set up in the path of the identification information of the attribute information of network equipment, the identification information of Ingress Network equipment and egress network equipment Message is sent to the 2nd PCE, to cause the 2nd PCE according to the attribute information of the first object network equipment, Ingress Network equipment Second destination path in domain where identification information and the identification information of egress network equipment determine the 2nd PCE；Wherein, it is to be determined LSP includes first object path and the second destination path, in this scenario, because the first PCE is in the path sent to the 2nd PCE Set up in request message and carry information, the identification information of Ingress Network equipment and the egress network equipment of the first object network equipment Identification information, and during the first object network equipment is the all-network equipment that includes of first object path, and where the 2nd PCE The network equipment of the network equipment connection in domain, the second target road can be determined by receiving path and setting up the 2nd PCE of request message Footpath, and the first PCE and the 2nd PCE are not limited, therefore, solve the control that SDN domains are run on present in prior art Device and run on conventional domain server coexist in the case of, it is impossible to the controller in SDN domains and run on tradition it is determined that running on The defect of LSP between the server in domain.

The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real Present one flow of flow chart or one square frame of multiple flows and/or block diagram or the device of the function in multiple square frames.

These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or Function in multiple square frames.

These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one The step of function in individual square frame or multiple square frames.

Although having been described for the above embodiment of the present invention, those skilled in the art once know basic creation Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include State embodiment and fall into having altered and changing for the scope of the invention.

Obviously, those skilled in the art can carry out various changes and modification without departing from this hair to the embodiment of the present invention The spirit and scope of bright embodiment.So, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention And its within the scope of equivalent technologies, then the present invention is also intended to comprising including these changes and modification.

Claims

1. a kind of method for determining label switching path LSP, it is characterised in that including：

RX path sets up request message, wherein, request message is set up in the path includes label switched path to be determined Identification information, the identification information of egress network equipment of Ingress Network equipment in LSP；

When determining that the egress network equipment is located at outside the domain of first path computing unit PCE places, according to the Ingress Network The first object path in domain where the identification information of equipment determines the first PCE, wherein, the first object path is described A part in LSP to be determined；

In the all-network equipment that the first object path is included, the net being connected with the network equipment in domain where the 2nd PCE Network equipment, is used as the first object network equipment；

Attribute information, the identification information of the Ingress Network equipment and the outlet of the first object network equipment will be carried The path of the identification information of the network equipment is set up request message and sent to the 2nd PCE, to cause the 2nd PCE according to described The mark letter of the attribute information of one destination network device, the identification information of the Ingress Network equipment and the egress network equipment Second destination path in domain where breath determines the 2nd PCE；Wherein, the LSP to be determined includes the first object road Footpath and second destination path.

2. the method as described in claim 1, it is characterised in that request message is set up for path computing request message in the path PCReq。

3. method as claimed in claim 1 or 2, it is characterised in that the attribute information of the first object network equipment includes The internet protocol address of the exterior chain interface of the first object network equipment.

4. method as claimed in claim 1 or 2, it is characterised in that domain where the first PCE is software defined network SDN Domain, the first PCE is run on SDN controllers；Domain is conventional domain where 2nd PCE, and the 2nd PCE runs on clothes It is engaged on device or routing device；Or,

Domain is conventional domain where first PCE, and the first PCE is run on server or routing device；2nd PCE Place domain is SDN domains, and the 2nd PCE is run on SDN controllers.

5. method as claimed in claim 1 or 2, it is characterised in that in the attribute by the first object network equipment is carried Request message is set up in the path of the identification information of information, the identification information of the Ingress Network equipment and the egress network equipment Send to the 2nd PCE, to cause attribute information, the entrance nets of the 2nd PCE according to the first object network equipment The second target road in domain where the identification information of network equipment and the identification information of the egress network equipment determine the 2nd PCE After footpath, in addition to：

It is logical by control if the first PCE is run on SDN controllers, the 2nd PCE is run on server or routing device The all-network equipment that road includes to the first object path sends corresponding label respectively.

6. a kind of method for determining label switching path LSP, it is characterised in that including：

Receive attribute information, the Ingress Network equipment for the carrying first object network equipment that first path computing unit PCE is sent Identification information and the path of identification information of egress network equipment set up request message, wherein, the path is set up request and disappeared Breath is the first PCE it is determined that the first object path in domain where the first PCE, and the institute included from the first object path Have and sent after the first object network equipment determined and be connected with the network equipment in domain where the 2nd PCE in the network equipment 's；

According to the attribute information of the first object network equipment, the identification information of the Ingress Network equipment and the outlet net Second destination path in domain where the identification information of network equipment determines the 2nd PCE, wherein, label switched path to be determined LSP includes the first object path and second destination path.

7. method as claimed in claim 6, it is characterised in that request message is set up for path computing request message in the path PCReq。

8. method as claimed in claims 6 or 7, it is characterised in that the attribute information of the first object network equipment includes The internet protocol address of the exterior chain interface of the first object network equipment.

9. method as claimed in claim 8, it is characterised in that according to the attribute information of the first object network equipment, institute State the identification information of Ingress Network equipment and the identification information of the egress network equipment determine the 2nd PCE where domain the Two destination paths, are specifically included：

Determine the exterior chain interface for the first object network equipment that the attribute information of the first object network equipment includes IP address the network segment；

Second destination network device is determined according to the network segment, second destination network device is domain where the 2nd PCE In there is the network equipment of the identical network segment with the network segment；

According to the mark of second destination network device, the identification information of the Ingress Network equipment and the egress network equipment Know second destination path in domain where information determines the 2nd PCE.

10. the method as described in claim 6,7 or 9, it is characterised in that domain where the first PCE is software defined network SDN domains, the first PCE is run on SDN controllers；Domain where 2nd PCE is conventional domain, the 2nd PCE operations In on server or routing device；Or,

11. the method as described in claim 6,7 or 9, it is characterised in that in the attribute according to the first object network equipment The identification information of information, the identification information of the Ingress Network equipment and the egress network equipment determines domain where the 2nd PCE The second destination path after, in addition to：

It is logical by control if the 2nd PCE is run on SDN controllers, the first PCE is run on server or routing device The all-network equipment that road includes to second destination path sends corresponding label respectively.

12. the method as described in claim 6,7 or 9, it is characterised in that receiving what first path computing unit PCE was sent Carry the identification information of the attribute information, the identification information of Ingress Network equipment and egress network equipment of the first object network equipment Path set up after request message, in addition to：

When determining that the egress network equipment is located at outside the domain of the 2nd PCE places, second destination path is included In all-network equipment, the network equipment being connected with the network equipment in domain where the 3rd PCE is used as the 3rd destination network device；

By the identification information and the egress network of the information of carrying the 3rd destination network device, the Ingress Network equipment The path of the identification information of equipment is set up request message and sent to the 3rd PCE, to cause the 3rd PCE according to the 3rd mesh The identification information for marking the attribute information, the identification information of the Ingress Network equipment and the egress network equipment of the network equipment is true 3rd destination path in domain where fixed 3rd PCE；Wherein, the LSP to be determined also includes the 3rd destination path.

13. method as claimed in claim 12, it is characterised in that domain where the 3rd PCE is conventional domain, the described 3rd PCE is run on server or routing device；Or

Domain is SDN domains where 3rd PCE, and the 3rd PCE is run on SDN controllers.

14. a kind of first path computing unit PCE, it is characterised in that including：

Receiving unit, request message is set up for RX path, wherein, the path set up request message include it is to be determined Identification information, the identification information of egress network equipment of Ingress Network equipment in label switching path LSP；

First determining unit, during for determining that the egress network equipment is located at outside the domain of the first PCE places, according to the entrance The first object path in domain where the identification information of the network equipment determines the first PCE, wherein, the first object path is A part in the LSP to be determined；

Second determining unit, in the all-network equipment that includes the first object path, with domain where the 2nd PCE The network equipment of network equipment connection, is defined as the first object network equipment；

Transmitting element, for by carry the attribute information of the first object network equipment, the Ingress Network equipment mark The path of the identification information of information and the egress network equipment is set up request message and sent to the 2nd PCE, to cause described Two PCE are according to the attribute information, the identification information of the Ingress Network equipment and the outlet of the first object network equipment Second destination path in domain where the identification information of the network equipment determines the 2nd PCE；Wherein, the LSP bags to be determined Include the first object path and second destination path.

15. the first PCE as claimed in claim 14, it is characterised in that request is set up in the path that the receiving unit is received Message is path computing request message PCReq, and/or request message is set up for PCReq in the path that the transmitting element is sent.

16. the first PCE as described in claims 14 or 15, it is characterised in that second determining unit determine first The attribute information of destination network device includes the internet protocol address of the exterior chain interface of the first object network equipment.

17. the first PCE as described in claims 14 or 15, it is characterised in that domain where the first PCE is software defined network Network SDN domains, the first PCE is run on SDN controllers；Domain where 2nd PCE is conventional domain, the 2nd PCE fortune Row is on server or routing device；Or,

18. the first PCE as described in claims 14 or 15, it is characterised in that the transmitting element is additionally operable to：

If the first PCE is run on SDN controllers, the 2nd PCE is run on server or routing device, pass through control The all-network equipment that passage processed includes to the first object path sends corresponding label respectively.

19. the 2nd PCE of one kind, it is characterised in that including：

Receiving unit, attribute information, Ingress Network equipment for receiving the carrying first object network equipment that the first PCE is sent Identification information and the path of identification information of egress network equipment set up request message, wherein, the path is set up request and disappeared Breath is the first PCE it is determined that the first object path in domain where the first PCE, and the institute included from the first object path Have and sent out after the first object network equipment determined and be connected with the network equipment in domain where the 2nd PCE in the network equipment Send；

Determining unit, the mark for the attribute information according to the first object network equipment, the Ingress Network equipment is believed Second destination path in domain where breath and the identification information of the egress network equipment determine the 2nd PCE, wherein, it is to be determined LSP include the first object path and second destination path.

20. the 2nd PCE as claimed in claim 19, it is characterised in that request is set up in the path that the receiving unit is received Message is path computing request message PCReq.

21. the 2nd PCE as described in claim 19 or 20, it is characterised in that first object used in the determining unit The attribute information of the network equipment includes the internet protocol address of the exterior chain interface of the first object network equipment.

22. the 2nd PCE as claimed in claim 21, it is characterised in that the determining unit is additionally operable to：

23. the 2nd PCE as described in claim 19,20 or 22, it is characterised in that domain is fixed for software where the first PCE Adopted network SDN domains, the first PCE is run on SDN controllers；Domain where 2nd PCE is conventional domain, described second PCE is run on server or routing device；Or,

24. the 2nd PCE as described in claim 19,20 or 22, it is characterised in that also including transmitting element, the transmission list Member is used for：

If the first PCE is run on SDN controllers, the 2nd PCE is run on server or routing device, pass through control The all-network equipment that passage processed includes to second destination path sends corresponding label respectively.

25. the 2nd PCE as described in claim 19,20 or 22, it is characterised in that the determining unit is additionally operable to：

26. the 2nd PCE as claimed in claim 25, it is characterised in that domain where the 3rd PCE is conventional domain, described the Three PCE are run on server or routing device；Or

Domain is SDN domains where 3rd PCE, and the 3rd PCE is run on SDN controllers.