CN102439919A

CN102439919A - Method, device and system for building lable switching path

Info

Publication number: CN102439919A
Application number: CN2011800022185A
Authority: CN
Inventors: 林毅
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-05-02
Anticipated expiration: 2031-09-28
Also published as: CN102439919B; WO2012149777A1

Abstract

The embodiment of the invention provides a method, a device and a system for building a label switching path, relating to the communication technology field. The method comprises the steps of using an entrance core node to receive a first path message sent by a source edge node, wherein, the first path message carries a first session identification; transforming the first path message into a second path message carrying the first session identification and a second session identification, wherein, the second session identification comprises the address message of the entrance core node, the address message of an exit core node and a tunnel identification distributed to the entrance core node, so that a core node in a core network takes the second session identification as the session identification of a label switching path; transmitting the second path message to the exit core node detailedly to make the exit core node restore the second path messages to be the first path messages via the first session identification, and transmitting the first path messages to the lodge node to build the label switching path.

Description

The methods, devices and systems that label switched path is set up

Technical field

The present invention relates to communication technical field, the methods, devices and systems that particularly a kind of label switched path is set up.

Background technology

Along with the continuous expansion of tranmission techniques, a kind of new network technology-GMPLS (Generalized Multi-Protocol Label Switching, the exchange of general multiple protocols label) that can accomplish label switched path foundation automatically arises at the historic moment.In the network of GMPLS, GMPLS utilizes RSVP-TE (Resource ReserVation Protocol-Traffic Engineering, the RSVP of band traffic engineering) to realize establishment of connection, and wherein, basic process is following:

1, source node is for connecting distribution T unnel ID (Tunnel Identifier) and LSP ID (label switching path Identifier, label switched path sign);

2, begin from source node,, carry Tunnel Identifier and label switched path sign etc. in the message along closure hop-by-hop transmit path (Path) message;

3, after destination node is received Path message; Begin from destination node; Carry out operations such as label distribution, resource reservation and interconnection foundation along the opposite direction that connects by node, and upstream nodes returns Resv (RESV) message, carry institute's distributed labels information in the message;

4, source node is received Resv message, connects to set up successfully.

A kind of model of existing GMPLS network is Overlay model (overlay model); Under overlay model; Be between two Overlay Network (overlay network) node, to set up 1 label switched path that passes Core Network (core network); But in the existing GMPLS network, the routing iinformation between overlay network and the core network is isolated each other, and promptly the node in the overlay network can not obtain the detailed topology information in the core network through Routing Protocol; Likewise; Node in the core network can not obtain the detailed topology information in the overlay network through Routing Protocol; In the time need between the node in two overlay networks, setting up 1 connection of passing core network; Need to adopt the UNI (User-Network Interface, User Network Interface) between overlay network and the core network to carry out establishment of connection.

In existing overlay network; Requirement source EN (Edge Node; Fringe node), inlet CN (Core Node; Core node), the uni interface of outlet CN, four nodes of place EN belongs to identical addressing space, just can adopt GMPLS UNI signaling, realizes the automatic foundation of the connection of EN EN to the place from the source.Source EN is the upstream node of inlet CN, and outlet CN is the upstream node of place EN.Under this prerequisite, the signaling message of GMPLS can begin from source EN, is sent to place EN along the node hop-by-hop that connects process, realizes establishment of connection.Set up in the process in connection, the Tunnel ID that each node utilizes source EN address+place EN address+source EN to distribute is as the unique identification of this session.

But in real network is disposed, because overlay network and core network possibly be independent separately the deployment, therefore when carrying out addressing for network node; Within same addressing space, be not that two networks carry out address assignment probably; Because independent addressing separately, the node address in the overlay network possibly conflict with the node address in the core network, as has distributed identical address; Though can occur belonging to two different sessions in this case; But because the node address in the overlay network has distributed identical address with node in the core network, cause two situation that session identification is identical, cause the node in the core network can not correctly distinguish different label switched paths; Thereby signaling protocol is handled confusion taking place, finally causes setting up correct label switched path.Or overlay network adopts different addressing modes with core network; For example the node in the overlay network adopts the addressing mode of IPv4; Node in the core network has then adopted the addressing mode of IPv6; If belong to different addressing modes between overlay network and the core network, after then the node in the core network receives the PATH of the node transmission in the overlay network, because the addressing space is different; Can not correctly discern the address of carrying in the PATH, thereby also can cause to set up correct label switched path.

Summary of the invention

In order to solve the problem that correctly to set up label switched path in the prior art, the methods, devices and systems that the embodiment of the invention provides a kind of label switched path to set up.Said technical scheme is following:

On the one hand, the method that provides a kind of label switched path to set up, said method comprises:

The inlet core node receives from source fringe node first PATH; Said first PATH carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of source node, the address information of destination node and said source node distribute;

With the said first path message conversion is second PATH; Said second PATH carries said first session identification and second session identification; Said second session identification comprises: the Tunnel Identifier that address information and the said inlet core node of the address information of said inlet core node, outlet core node distributes makes core node in the core network with the session identification of said second session identification as label switched path;

The said second PATH hop-by-hop is sent to said outlet core node; Make said outlet core node said second PATH is reduced to said first PATH according to said first session identification; And said first PATH sent to said destination node, to set up label switched path.

On the other hand, a kind of Ingress node is provided, said node comprises:

Receiver module; Be used to receive first PATH that sends from the source fringe node; Said first PATH carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of source node, the address information of destination node and said source node distribute;

Modular converter; Being used for the said first path message conversion is second PATH; Said second PATH carries said first session identification and second session identification; Said second session identification comprises: the Tunnel Identifier that address information and the said inlet core node of the address information of said inlet core node, outlet core node distributes makes core node in the core network with the session identification of said second session identification as label switched path;

Sending module; Be used for the said second PATH hop-by-hop is sent to said outlet core node; Make said outlet core node said second PATH is reduced to said first PATH according to said first session identification; And said first PATH sent to said destination node, to set up label switched path.

On the other hand, the method that also provides a kind of label switched path to set up, said method comprises:

User Network Interface UNI server receives from source fringe node first PATH; Said first PATH carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of source node, the address information of destination node and said source node distribute;

Said second PATH is sent to said inlet core node; Make said inlet core node the said second PATH hop-by-hop sent to the server at said outlet core node place; The server at said outlet core node place is reduced to said first PATH according to said first session identification with said second PATH; Said first PATH is sent to said destination node, to set up label switched path.

On the other hand, the system that also provides a kind of label switched path to set up, said system comprises: aforesaid inlet core node and outlet core node;

Said outlet core node is used to receive second PATH that said inlet core node hop-by-hop sends; According to first session identification, said second PATH is reduced to first PATH, said first PATH is sent to destination node, to set up label switched path.

On the other hand, a kind of server is provided also, said server comprises:

Receiver module; Be used for receiving from source fringe node first PATH; Said first PATH carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of source node, the address information of destination node and said source node distribute;

Forwarding module; Be used for said second PATH is sent to said inlet core node; Make said inlet core node the said second PATH hop-by-hop sent to the server at said outlet core node place; The server at said outlet core node place is reduced to said first PATH according to said first session identification with said second PATH, said first PATH is sent to said destination node, to set up label switched path.

On the other hand, the system that also provides a kind of label switched path to set up, said system comprises: the server at aforesaid server, inlet core node and outlet core node place;

Said inlet core node is used to receive second PATH that said server sends, and the said second PATH hop-by-hop is sent to the server at said outlet core node place;

The server at said outlet core node place is used for according to first session identification said second PATH being reduced to first PATH, said first PATH is sent to destination node, to set up label switched path.

The beneficial effect of the technical scheme that the embodiment of the invention provides is: first session identification that carries in first PATH at inlet core node place is changed second session identification; Second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes; Second session label information is unique at the inlet core node to the path of outlet core node; Core node in the core network is with the session identification of said second session identification as label switched path; Cause the node in the core network can not correctly distinguish different label switched paths thereby solved, can't set up the problem of correct label switched path because source node is identical with inlet core node address.And owing to be second PATH with the first path message conversion at inlet core node place; Make core node in the core network with the session identification of said second session identification as label switched path; Even the addressing space of the addressing space of overlay network and core network is different like this; Node on the core net still can read second PATH after the conversion, thereby also can solve the problem that can't correctly set up label switched path because addressing mode is different.

Description of drawings

In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the flow chart of the method set up of a kind of label switched path that the embodiment of the invention provides;

Fig. 2 is the flow chart of the method set up of a kind of label switched path that the embodiment of the invention provides;

Fig. 3 is the flow chart of the method set up of a kind of label switched path that the embodiment of the invention provides;

Fig. 4 is that a kind of that the embodiment of the invention provides is deployed in the system schematic beyond each node of network with the UNI department server;

Fig. 5 is the sketch map of a kind of UNI_info Format Object of providing of the embodiment of the invention;

Fig. 6 is the system schematic of a kind of label switched path of providing of the embodiment of the invention;

Fig. 7 is the sketch map of a kind of core node that enters the mouth that the embodiment of the invention provides;

Fig. 8 is the system schematic that a kind of label switched path that the embodiment of the invention provides is set up;

Fig. 9 is the sketch map of a kind of server of providing of the embodiment of the invention;

Figure 10 is the system schematic that a kind of label switched path that the embodiment of the invention provides is set up.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.

Understand for convenient, tunnel (Tunnel), connection (also claiming LSP or path), session (session) three's relation once need be described:

Connection be first end-node between a pipeline setting up, can be used for transmitting the business of client layer;

Tunnel is the transmission resource that between a pair of first end-node, provides for specific transactions of client layer, and a tunnel possibly comprise 1 or many connections.For example, break down and carry out heavy-route, perhaps the bandwidth that connects to be made amendment if connect, then after the heavy-route or the amended connection of bandwidth be two different connections with original being connected, but belong to same Tunnel; And for example, for 1+1 or 1: 1 business, operating path and protection path are two and different are connected but belong to same Tunnel;

At control plane, the GMPLS signaling protocol utilizes 1 Session to set up and control 1 Tunnel.In signaling protocol, can carry the sign of session and the sign that is connected, indicate the pairing Tunnel of this signaling message and be connected;

That GMPLS utilizes is that source node address+destination node address+source node is distributed, in source node unique Tunnel ID, as the unique identification of 1 session;

That GMPLS utilizes is that session sign+source node distributes, in source node (or in source node+Tunnel ID scope) unique LSP ID, as the unique identification of 1 connection.

Referring to Fig. 1, the method that the embodiment of the invention provides a kind of label switched path to set up comprises:

101: the inlet core node receives first PATH that sends from the source fringe node; Said first PATH carries first session identification, and said first session identification comprises the address information of source node, the address information of destination node and the Tunnel Identifier that said source node distributes;

102: with the first path message conversion is second PATH; Second PATH carries said first session identification and second session identification; Said second session identification comprises: the Tunnel Identifier that address information and the said inlet core node of the address information of said inlet core node, outlet core node distributes makes core node in the core network with the session identification of said second session identification as label switched path;

103: the said second PATH hop-by-hop is sent to said outlet core node; Make said outlet core node second PATH is reduced to first PATH according to said first session identification; And said first PATH sent to said destination node, to set up label switched path.

In the present embodiment; Source fringe node, place fringe node, source node and destination node belong to overlay network; The inlet core node belongs to core network with the outlet core node, and the source fringe node is the upstream node of inlet core node, and the place fringe node is the downstream node of outlet core node.

In the present embodiment, be second PATH, comprise the said first path message conversion:

Obtain the address information of place fringe node, search pre-configured User Network Interface information, confirm the outlet core node that links to each other with said place fringe node according to the address information of said place fringe node; Said pre-configured UNI information comprises: the address information of the address information of said source fringe node, the inlet core node corresponding with said source fringe node, the address information of the address information of said place fringe node, the outlet core node corresponding with said place fringe node;

Address information according to said definite outlet core node is that label switched path distributes Tunnel Identifier; Obtain second session identification, said second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes;

Said first session identification that carries in first PATH is replaced with said second session identification, obtain second PATH, said second PATH comprises said first session identification and said second session identification.

In the present embodiment, also carry the port-mark of said source node or the port-mark of said inlet core node in first PATH, be used to indicate the User Network Interface that said source node is selected;

Wherein, when carrying the port-mark of said source node in said first PATH, after first PATH that said inlet core node reception sources node sends, also comprise:

The port-mark of said source node is replaced being the port-mark of said inlet core node.

Further, in the present embodiment, also carry first label switched path sign LSP ID in first PATH; Then said second PATH carries second label switched path sign and said first label switched path sign, and said second label interaction path sign is that said inlet core node is that label switched path distributes.

In the present embodiment, the said second PATH hop-by-hop is sent to after the said outlet core node, also comprises:

Said outlet core node receives said second PATH;

According to said first session identification, second session identification in said second PATH is replaced with said first session identification, to obtain said first PATH.

In the present embodiment, also carry the network identity at said source node place in first PATH, be used to show the network at said source node place.

The beneficial effect of method embodiment provided by the invention is: first session identification that carries in first PATH at inlet core node place is changed second session identification; Second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes; Second session label information is unique at the inlet core node to the path of outlet core node; Core node in the core network is with the session identification of said second session identification as label switched path; Cause the node in the core network can not correctly distinguish different label switched paths thereby solved, can't set up the problem of correct label switched path because source node is identical with inlet core node address.And owing to be second PATH with the first path message conversion at inlet core node place; Make core node in the core network with the session identification of said second session identification as label switched path; Even the addressing space of the addressing space of overlay network and core network is different like this; Node on the core net still can read second PATH after the conversion, thereby also can solve the problem that can't correctly set up label switched path because addressing mode is different.

Referring to Fig. 2, the method that the embodiment of the invention provides a kind of label switched path to set up comprises:

201: User Network Interface UNI server receives first PATH that sends from the source fringe node; Said first PATH carries message and carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of source node, the address information of destination node and said source node distribute;

202: with the said first path message conversion is second PATH; Said the 2nd P PATH carries said first session identification and second session identification; Said second session identification comprises: the Tunnel Identifier that the address information of the address information of said inlet core node, said outlet core node and said inlet core node distribute makes core node in the core network with the session identification of said second session identification as label switched path;

203: said second PATH is sent to said inlet core node; Make said inlet core node the said second PATH hop-by-hop sent to the UNI server at said outlet core node place; The UNI server at said outlet core node place is reduced to first PATH according to said first session identification with said second PATH; Said first PATH is sent to said destination node, to set up label switched path.

Obtain the address information of place fringe node, search pre-configured UNI information, the address information of definite outlet core node that links to each other with said place fringe node according to the address information of said place fringe node; Said pre-configured UNI information comprises: the address information of the address information of said source fringe node, the inlet core node corresponding with said source fringe node, the address information of the address information of said place fringe node, the outlet core node corresponding with said place fringe node;

Said first session identification that carries in said first PATH is replaced with said second session identification, obtain second PATH, said second PATH comprises said first session identification and said second session identification.

The beneficial effect of method embodiment provided by the invention is: through the UNI server is set; First session identification that carries in first PATH is changed second session identification; Second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes; Second session label information is unique at the inlet core node to the path of outlet core node; Core node in the core network is with the session identification of said second session identification as label switched path; Cause the node in the core network can not correctly distinguish different label switched paths thereby solved, can't set up the problem of correct label switched path because source node is identical with inlet core node address.And owing to be second PATH with the first path message conversion at inlet core node place; Make core node in the core network with the session identification of said second session identification as label switched path; Even the addressing space of the addressing space of overlay network and core network is different like this; Node on the core net still can read second PATH after the conversion, thereby also can solve the problem that can't correctly set up label switched path because addressing mode is different.

Referring to Fig. 3, the method that the embodiment of the invention provides a kind of label switched path to set up, source node and source fringe node are a node in the present embodiment, and destination node and place fringe node are a node, and concrete grammar comprises:

301: initialization UNI server.

In the present embodiment, for solving the addressing space bound problem of UNI, a kind of UNI server is provided, has disposed the relevant information of UNI link in this UNI server, promptly pre-configured UNI information is like two end node address, two ends interface IP address etc.When setting up UNI and connect, the UNI server can be realized the conversion to the address designation in the PATH, and to the forwarding of PATH.In concrete the realization, this UNI server can be to be independent of the server beyond each node in the network, also can directly be deployed on the inlet and/or Egress node at core network edge, and promptly the edge core node is directly as the UNI server.In addition, 1 centralized UNI server can be in 1 core network, only disposed, also 1 distributed UNI server of each edge core node deployment can be.Present embodiment is not done concrete qualification to this.As shown in Figure 4; Provide a kind of and distributed the UNI department server has been deployed in the system schematic beyond each node of network; Wherein the fringe node in the overlay network is EN1 and EN2, and the core node in the core network is CN1, CN2 and CN3, and wherein CN1 is the inlet core node; CN2 is the outlet core node, and UNI server A and UNI server B are to be deployed in CN1 and the outer server of CN2 respectively.

In the present embodiment, the UNI server is by operator's control of core network, and overlay network is connected to this core network to the core network carrier application in networking; Core network configuration UNI server, thus can service be provided for overlay network.Concrete, in netinit, the operator of core network can dispose the information of each UNI link on each UNI server.These UNI link informations can directly be configured in the routing table, also can be as independent UNI link information table.For example, for the UNI server among Fig. 4, configurable UNI link information as shown in table 1 below:

Table 1

Wherein, the form of presentation of the port of UNI link can be the IP address, also can be in the unique non-number port sign of an intranodal.In addition, for the situation of link bundling, promptly many Member Links are bound the situation of 1 UNI link, except the port address of configuration binding link or the port-mark, also need the further Member Link sign of inner each the bar Member Link of configuration binding link.

In the present embodiment; Situation for distributed UNI server; Can also on each UNI server, only dispose the information of corresponding UNI link (being local UNI link), through Routing Protocol, in core network, be flooded to other UNI servers to the information of this UNI link then; Other servers dispose the information of UNI link non-indigenous automatically according to the UNI link information of receiving.UNI server A as shown in Figure 4 and UNI server B all are distributed servers; On two servers, disposed local UNI link information respectively; Promptly in UNI server A deploy the address information of EN1 and CN1, in UNI server B deploy the address information of EN2 and CN2, pass through Routing Protocol then; In core network; The address information of UNI server A and UNI server B deploy is flooded to other UNI server, and the address information that is about to UNI server A deploy is flooded on the UNI server B, and the address information on the UNI server B is flooded on the UNI server A.

In addition, can communicate by letter with the overlay network control plane for making the UNI server, the UNI server needs 1 control plane interface to link to each other with the control plane of overlay network, and this interface need distribute one to belong to the address of same addressing space with overlay network simultaneously.If the UNI server is independent of outside the core net, then the UNI server also needs another interface to link to each other with the control plane of core net, and is same, and this interface need distribute 1 to belong to the address of same addressing space with core network.

302: when needs connected between EN1 and EN2, source EN1 sent Path message through intermediate node to EN2.

In the present embodiment; Source EN1 as shown in Figure 4 is exactly the source node of label switched path, when EN1 need connect between EN1 and EN2, (supposes that this connection belongs to a new tunnel), and EN1 can send Path message to corresponding UNI server; In Path message; Carry source node address information, destination node address information and the unique tunnel address information in the source node scope, as shown in Figure 4, EN1 is respectively EN1 and EN2 by head, the destination node that normal mode indicates connection; And be distributed in tunnel ID unique in the EN1 scope (for example tunnel ID=111); It is unique in the source that the is identified at EN scope that perhaps address of this tunnel ID and place EN is formed that (promptly in the EN of source, all arrive the tunnel of phase chummage EN, and the value of its tunnel ID is all different; The tunnel ID in the tunnel of chummage EN maybe be not identical but arrive), this source node address information, destination node address information and the unique tunnel address information in the source node scope are exactly first session identification.

In the present embodiment, also comprise IF_ID RSVP_HOP object in the message, comprise the local terminal port-mark or the Peer-Port sign of UNI link in this object, be used to indicate the selected UNI link of source node.For example, in Fig. 4, EN1 possibly select the two ends port-mark to be respectively the UNI link of Pa and P1, and under normal conditions, what comprise in the IF_ID RSVP_HOP object is the Peer-Port sign (P1, i.e. link ID) of UNI link.(for example the EN node does not know that the Peer-Port of this UNI link identifies but the EN node maybe be because of the addressing space problem can not be inserted the sign of the Peer-Port of this UNI link in this object; Or the signaling process of EN node is not supported IPv6; And the Peer-Port sign is the form of IPv6; Therefore can't in IF_ID RSVP_HOP, insert UNI Peer-Port sign), in this case, EN1 can fill in the port-mark (Pa) of local terminal in IF_ID RSVP_HOP object.

At last, EN1 is encapsulated as the IP bag to Path message, and the destination address of IP bag is corresponding UNI server.Like this, Path message just can be sent to the UNI server.

303:UNI server or inlet core node are handled the Path message that receives.

In the present embodiment, UNI server or inlet core node receive that the processing to Path message specifically comprises after the Path message:

1) confirms the outlet core node.UNI server or inlet core node obtain the address information of place fringe node, according to place fringe node address information, search the UNI information that is disposed, the address information of definite outlet core node that links to each other with the place fringe node.More preferably; If the place fringe node links to each other with a plurality of outlet core nodes (being called many ownership) simultaneously; Then the UNI server can be selected optimum outlet core node according to network topology and resource situation; For example the UNI server can calculate the path from source EN to cost minimum the EN of place, thereby confirms the outlet core node.

2) address replacement.UNI server or inlet core node replace with the inlet core node with the source node address in the Path message, destination node address and export the address of core node, promptly replace with the address of EN1 the address of CN1, replace with the address of EN2 the address of CN2.In addition; If what the IF_ID RSVP_HOP object in the Path message comprised is the port-mark of UNI link in the EN side, then also need replace with the port-mark of UNI link to this sign according to UNI information in inlet core node side; Promptly replace with P1 to Pa; Like this inlet core node can know EN selected be any bar UNI link, reserved resource on selected UNI link is then given professional the use.

3) UNI server or inlet core node are that label switched path distributes tunnelID according to the address information of outlet core node, and this tunnel ID is unique in inlet core node scope; Perhaps; Being identified at of the address composition of this tunnel ID and outlet core node is unique in the inlet core node scope (promptly in the inlet core node; All arrive the tunnel of identical outlet core node; The value of its tunnel ID is all different, maybe be identical but arrive the different tunnel ID that export the tunnel of core nodes).Wherein, the address of inlet core node, outlet core node and inlet core node are that label switched path distributes tunnel ID for as second session identification according to the address information of outlet core node.

What step 2)-3) carry out is the process of second PATH with the said first path message conversion exactly.

In the present embodiment; The session sign that UNI server or inlet core node send source node; Replace with after the 2nd session sign, also need in Path message, to preserve session sign, specifically comprise the node address of source EN and place EN, the tunnel ID that source EN distributes.In concrete the realization, can in Path message, preserve these information by UNI_info object of redetermination.The UNI server can also be preserved the LSP ID that source EN distributes.Referring to Fig. 5; The embodiment of the invention provides the sketch map of a UNI_info Format Object; Wherein Tunnel source end point address and Tunnel destination end point address are respectively the node address (take 32 bits when adopting IPv4 respectively, take 128 bits when adopting IPv6 respectively) of source EN and place EN; Tunnel ID and LSP ID are respectively Tunnel ID and the LSP ID that source node distributes, and the LSP id field is optional.

In the present embodiment, Path message is also carried LSP ID, and the LSP ID that UNI server or inlet core node can directly adopt source EN to distribute also can redistribute a new LSP ID.If distribute new LSP ID, then need fill in the LSP ID that source EN distributes in the UNI_info object.

In the present embodiment, UNI server or inlet core node session sign (the tunnel ID that source EN address+place EN address+source EN distributes) and the session sign after the conversion (the inlet core node tunnel ID that the address+outlet core node address+inlet core node distributes) before conversion is preserved in this locality.UNI server or inlet core node can also be preserved before the conversion and the LSP ID after the conversion.

Need to prove that if the UNI department server is deployed in outside the inlet core node, then the UNI server need send to the inlet core node to the Path message of handling.Wherein, the UNI server can adopt the RSVP-TE agreement, also can adopt other communication protocols to send, and this present embodiment is not done concrete qualification.If the UNI server directly is deployed in the inlet core node, then do not need this process.

4) the inlet core node is except accomplishing above 1)-3) the step; Also need handle Path message by normal mode; The control plane that is included in the inlet core node is created the state of a control piece; Preserve the information in the Path message, the link of the downstream direction of inlet core node is selected in the connection that will set up for institute, and downstream transmission Path message.Alternatively; When handling Path message; The inlet core node can also be signed distribution at the enterprising rower of the link of its selection, and (institute's distributed labels will be carried in the Path message; Send to the inlet core node) with the process of resource reservation, can also be further to the datum plane transmitting order to lower levels of inlet core node, set up inbound port from the core node that enters the mouth to the interconnection the outbound port.

304: each intercooler core node node is handled the Path message that receives.

In the present embodiment; Each the intercooler core node node that connects process is handled Path message by normal mode; The control plane that is included in node is created the state of a control piece, preserves the information in the Path message, the link of the connection selection downstream direction that will set up for institute; And hop-by-hop downstream transmission Path message, up to outlet core node node.Alternatively; When handling Path message; Intermediate node can also be signed distribution at the enterprising rower of the link of its selection, and (institute's distributed labels will be carried in the Path message; Send to the downstream neighbor node) and the process of resource reservation, can also be further to the datum plane transmitting order to lower levels of node, set up inbound port from intermediate node to the interconnection the outbound port.In the processing procedure of intermediate node to Path message, the UNI_info object remains unchanged, and is delivered to the outlet core node with Path message always.

305: after outlet core node or UNI server receive Path message Path message is handled.

In the present embodiment, because at inlet core node place, the UNI server is changed the original Path message that source node sends, so at outlet core node place, the UNI server needs the Path message after the reduction conversion, specifically comprises:

1) after outlet core node or UNI server are received Path message; From the UNI_info object, obtain source EN, the address information of place EN and the tunnel ID that source EN is distributed; Simultaneously; Outlet core node or UNI server are reduced to the address information of source EN, place EN and the tunnel ID that source EN is distributed with the source node address in the Path message, destination node address and tunnel ID, and the UNI_info object in the deletion Path message.Alternatively,, and comprise the LSP ID that source EN distributes in the UNI_info object, then export core node or UNI server and also need be reduced to the LSP ID in the Path message LSP ID that source EN distributes if the inlet core node has distributed new LSP ID.

2) outlet core node or UNI server are selected the UNI link between outlet core node and the place EN, give to connect and use.

In the present embodiment; If the UNI server is independent of outside the outlet core node; And by outlet core node selection UNI link; And the outlet core node does not have the port identification information of UNI link EN side in the place; Then export core node and in the IF_IDRSVP_HOP object, fill in the port-mark (like P3) of the outlet core node side of selected UNI link, the UNI server replaces being the port-mark (like Pc) of place EN side to the local terminal port-mark in the IF_ID RSVP_HOP object then according to the UNI information table.

Alternatively; If the UNI department server is deployed on the core node; Perhaps select the UNI link by the UNI server; Perhaps export the address information that core node has UNI link EN side in the place, then exporting core node or UNI server can directly be filled into the port-mark (like Pc) of selected UNI link in place EN side in the IF_ID RSVP_HOP object.

Further, UNI server or outlet core node node before reduction is preserved in this locality session sign (the inlet core node tunnel ID that the address+outlet core node address+inlet core node distributes) and reduce after session identify (the tunnel ID of source EN address+place EN address+source EN distribution).Preferably, UNI server or outlet core node node can also be preserved before the reduction and the LSP ID after the reduction.

Likewise, the outlet core node also need be handled Path message by normal mode, and the control plane that is included in the outlet core node is created the state of a control piece, preserves the information in the Path message; Alternatively; After the UNI link of having selected between outlet core node and the place EN; The outlet core node can also be signed distribution at the enterprising rower of the UNI of its selection link, and (institute's distributed labels will be carried in the Path message; Send to place EN node) and the process of resource reservation, can also be further to the datum plane transmitting order to lower levels of outlet core node, set up inbound port from the outlet core node to the interconnection the outbound port (being the port of UNI link) in outlet core node side.

At last, the UNI server is encapsulated as the IP bag to amended Path message, and the destination address of IP bag is the address of place EN.Like this, Path message just can be sent to place EN.

306: place EN2 handles Path message after receiving Path message, and returns Resv message through intermediate node to EN1.

In the present embodiment, after place EN receives Path message, handle this Path message by normal mode, comprising: the control plane of EN node is created the state of a control piece in the place, preserves the information in the Path message; If the unallocated label of outlet core node node before; Then EN node in place is signed the process of distribution and resource reservation at the enterprising rower of selecteed UNI link; Otherwise by outlet core node node institute's distributed labels reserved resource on selecteed UNI link; And upstream nodes returns Resv message, carries institute's distributed labels information in the message.Source in the Resv message, destination node still are source EN and place EN, the value that tunnel ID and LSPID still distribute for source EN.

Similar with step 202, if place EN does not have the port identification information of UNI link in outlet core node side, then in the IF_IDRSVP_HOP object, fill in the port identification information of UNI in the EN side.Place EN is encapsulated as the IP bag to Resv message, and the destination address of IP bag is the address of corresponding UNI server, thereby Resv message is sent to corresponding UNI server.

307: outlet core node or UNI server are to the processing of Resv message.

In the present embodiment; Outlet core node and UNI server are similar to the processing of Path message with inlet core node and UNI server to the processing of Resv message; Specifically comprise: the UNI server with in the Resv message source node address, destination node address replace address for inlet core node and outlet core node; Promptly replace being the address of CN1 to the address of EN1, replace being the address of CN2 to the address of EN2.Simultaneously, the UNI server replaces the tunnel ID for the distribution of inlet core node to the tunnel ID in the Resv message.In addition,, then also need replace this sign to be the port-mark of UNI link, promptly replace being P3 to Pc according to the UNI information table in the core node side if the IF_ID RSVP_HOP object in the Resv message comprises is the port-mark of UNI link in the EN side.

Alternatively, in the present embodiment,, then export core node or UNI server and also need replace LSP ID to the LSP ID in the Resv message for the distribution of inlet core node if the inlet core node has distributed new LSP ID.

Alternatively, comprise the UNI_info object in the Resv message, but since inlet core node or UNI server for saving the information in the UNI_info object, so this object can be with and can not be with.

Equally, outlet core node node is handled this Resv message by normal mode, comprising: preserve the information in the Resv message, obtain place EN node institute distributed labels, thereby confirm to attend institute's reserved resource at the UNI link; If export the unallocated label of upstream neighbor node of core node node before; Then export the core node node and sign the process of distribution and resource reservation, otherwise press upstream neighbor node institute distributed labels reserved resource on selecteed link of outlet core node node at the enterprising rower of the selecteed link of updrift side.If when handling Path message, do not set up interconnection before the outlet core node node; Then also need further to the datum plane transmitting order to lower levels of this node, set up inbound port from outlet core node node to the interconnection the outbound port (being the port of UNI link) in outlet core node side.At last, outlet core node node upstream nodes is returned Resv message, carries institute's distributed labels information in the message.

308: each intercooler core node node is handled the Resv message that receives.

In the present embodiment; Each the intercooler core node that connects process is handled Resv message by normal mode; Comprise: preserve the information in the Resv message; Obtain downstream neighbor node institute distributed labels, thereby confirm that the link between this node and its downstream neighbor node attendes institute's reserved resource; If the unallocated label of upstream neighbor node of intermediate node before; Then intermediate node is signed the process of distribution and resource reservation at the enterprising rower of the selecteed link of updrift side, otherwise presses upstream neighbor node institute distributed labels reserved resource on selecteed link of intermediate node.If when handling Path message, do not set up interconnection before the intermediate node, then also need further to the datum plane transmitting order to lower levels of this node, set up inbound port from intermediate node to the interconnection the outbound port.At last, each intermediate node hop-by-hop upstream direction is sent Resv message, carries institute's distributed labels information in the message, up to the inlet core node.If comprise the UNI_info object in the Resv message, then in this process, the UNI_info object remains unchanged, and is delivered to the inlet core node with Resv message always.

309: inlet core node or UNI server are handled the Resv message that receives.

In the present embodiment; Inlet core node and UNI server are similar to the processing of Path message with outlet core node and UNI server to the processing of Resv message; Specifically comprise: after inlet core node or UNI server are received Resv message, from the UNI_info object or from the information that preserve this locality, obtain source EN, the address information of place EN and the tunnel ID that source EN is distributed.Simultaneously, inlet core node or UNI server are reduced to the address information of source EN, place EN and the tunnel ID that source EN is distributed with the source node address in the Resv message, destination node address and tunnel ID, and the UNI_info object in the deletion Path message.Alternatively, if the inlet core node has distributed new LSP ID, then enter the mouth core node or UNI server also need be reduced to the LSP ID in the Resv message LSP ID that source EN distributes.

In the present embodiment, the UNI server is filled into selected before UNI link in the IF_ID RSVP_HOP object at the port-mark (like Pa) of source EN side; Perhaps, the outlet core node is filled into selected before UNI link in the IF_ID RSVP_HOP object at the port-mark (like P1) of core node side, is converted into this sign by the UNI server port-mark (like Pa) of corresponding source EN side again.

Equally; Inlet core node node is handled this Resv message by normal mode; Comprise: preserve the information in the Resv message, obtain downstream neighbor node institute distributed labels, thereby confirm to attend institute's reserved resource at the link that enters the mouth between core node node and its downstream neighbor node; If the unallocated label of source EN node before, the core node node that then enters the mouth is signed the process of distributing with resource reservation at the enterprising rower of selecteed UNI link, otherwise presses source EN node institute distributed labels reserved resource on selecteed UNI link.Inlet core node node also comprises institute's distributed labels in Resv message.If when handling Path message, do not set up interconnection before the inlet core node node; Then also need further to the datum plane transmitting order to lower levels of this node, set up inbound port (being the port of UNI link) to the interconnection the outbound port in inlet core node side from inlet core node node.

At last, the UNI server is encapsulated as the IP bag to amended Resv message, and the destination address of IP bag is the address of source EN.Like this, Resv message just can be sent to source EN.

310: source EN1 is to the processing of Resv message.

In the present embodiment, after source EN1 node is received Resv message, preserve the information in the Resv message, obtain inlet core node node institute distributed labels, thereby confirm to attend institute's reserved resource, accomplish the process that connection is set up at the UNI link.

For making those skilled in the art more clearly understand the present invention, be exemplified below at present:

Shown in Figure 6; Suppose that core network is that two separate overlay networks (A and B) provide the transmission resource; Because core network, overlay network A, overlay network B are distribution node addresses in scope separately; Therefore might exist the address of EN1, EN3, CN1 identical (being 1.1.1.1 all), the situation of the address of EN2, EN4, CN2 identical (all being 1.1.1.2).For distinguishing different overlay networks, in the UNI server, can also dispose the sign of the affiliated overlay network of UNI link, as shown in table 2 below:

Table 2

Suppose to set up 3 connections such as CN1-CN2, EN1-EN2, EN3-EN4 respectively, then:

1, when the connection of setting up CN1-CN2,, therefore can connect foundation by normal GMPLS signaling owing to do not relate to the UNI signaling.Suppose CN1 being designated: source node address=1.1.1.1, destination node address=1.1.1.2, tunnel ID=111 to this session.

2, when setting up EN1-EN2, suppose that the tunnel ID that EN1 distributes also just is 111, promptly EN1 is similarly source node address=1.1.1.1 to the sign of this session, destination node address=1.1.1.2, tunnel ID=111.

At CN1 the session sign is changed; Although source and destination node address still are 1.1.1.1 and 1.1.1.2; But CN1 need be that this connects new 1 tunnel ID unique in the CN1 scope of distribution, and perhaps being identified at of the address of this tunnel ID and CN2 composition unique in the CN1 scope (like tunnel ID=222), so CN1 is designated the session of the connection of EN1-EN2: source node address=1.1.1.1; Destination node address=1.1.1.2, tunnel ID=222.

In addition; In the core network porch; Because CN1 or UNI server need provide at least 2 control plane interfaces, the control plane with EN1 and EN3 links to each other respectively, therefore; CN1 or UNI server can judge which overlay network the source fringe node in the Path message belongs to according to Path message from which control plane interface.But because the node address of EN2 and EN4 is identical, CN2 but can not judge that which this overlay network is the place fringe node that this UNI connects according to the place fringe node address information in the UNI_info object after receiving Path message.For preventing this situation, CN1 or UNI server need carry extra information and indicate source, the place fringe node that this UNI connects and belong to which overlay network in Path message.A kind of method is; In Path message, carry the port-mark P1 of source end UNI link in inlet core node side; Can be placed in ERO (Explicit Route Object, the explicit route object) object, like this; Outlet core node or UNI server can be according to the UNI information tables of configuration, and the source fringe node of judging this connection is from overlay network A; Another kind method is, newly-increased 1 overlay_network_ID object in Path, and the explicit source fringe node that indicates is from overlay network A.

3, likewise, when setting up EN3-EN4, suppose that the tunnel ID that EN3 distributes also just is 222, promptly EN3 is similarly source node address=1.1.1.1 to the sign of this session, destination node address=1.1.1.2, tunnel ID=222.

At CN1 the session sign is changed; Although source and destination node address still are 1.1.1.1 and 1.1.1.2, CN1 need connect new 1 tunnel ID unique in the CN1 scope of distribution for this, and being identified in the CN1 scope that perhaps address of this tunnel ID and CN2 is formed is unique; Like tunnel ID=333; Therefore CN1 is designated the session of the connection of EN3-EN4: source node address=1.1.1.1, destination node address=1.1.1.2, tunnel ID=333.Likewise, also need carry port-mark P2 or the overlay_network_ID object of source end UNI link in the Path message, indicate the source fringe node from overlay network B in inlet CN side.

It is thus clear that each node in the core network can know correctly that 3 connections belong to different session respectively, so these 3 connections all can correctly be set up.

It is the execution mode of a node that a kind of source node and source fringe node are provided in the present embodiment, and wherein, source node and source fringe node also can not be nodes; The source fringe node is the intermediate node of whole label switched path; Rather than the promoter who sets up label switched path, in this case, in the time need connecting between source node and the destination node; The source node hop-by-hop sends Path message to the source fringe node; In this message, source node is respectively source node and destination node by the first end-node that normal mode indicates connection, and is distributed in unique tunnel ID in the network range of source node place; After the source fringe node is received Path message; Send Path message to corresponding UNI server and maybe this Path message is sent on the inlet core node with UNI server capability, UNI server or inlet core node are handled this Path message again, and source node and source fringe node are that the embodiment of a node is the same in concrete processing procedure to Path message and the foregoing description; With source node and destination node; And being distributed in that unique tunnel ID replaces with the address information of inlet core node, the address information of outlet core node and the Tunnel Identifier that the inlet core node distributes in the network range of source node place, difference is exactly, and is exactly among the embodiment of source fringe node at source node; The place fringe node is exactly a destination node; So carried the address information of place fringe node in the Path message, and be not under the scene of a node at source node and source fringe node, if source node before connecting, confirmed to connect each network domains that will pass through; Then can carry the entry node addresses of each network domains in the Path message, comprise the address of the Ingress node (being the place fringe node) of place overlay network; If source node also confirms to connect each network domains that institute will pass through before connect, the path computation service device that the UNI server can ask to have the global path computation ability carries out inter-domain path and calculates, thus definite place fringe node node address.Intermediate node in the core network is the same with handling process in the foregoing description for the processing of Path message, repeats no more at this.After the place fringe node is received Path message, after the Path Message Processing, send Path message to the destination node hop-by-hop; After destination node was received Path message, hop-by-hop returned Resv message along the road, thereby set up the label switched path of source node to destination node.

The beneficial effect of method embodiment provided by the invention is: in overlay network and core network, dispose the UNI server, or will enter the mouth core node and the function that exports expansion UNI server on the core node, in the UNI server, disposed the relevant information of UNI link; When setting up the UNI connection; The UNI server can be realized the conversion to the address designation in the Path message, and to the forwarding of Path message, even belong under the scene of different addressing spaces at overlay network and core network; Conversion through the UNI server; Convert the address information in the Path message into address information that core network node can be discerned, connect thereby set up UNI automatically, and at inlet core node place; Redistribute the address, tunnel; Avoided overlay network identical, the identical situation of sign of different sessions occurred, finally solved UNI and connected the problem that to set up automatically with the core network address.

Referring to Fig. 7, the embodiment of the invention provides a kind of inlet core node, comprising: receiver module 401, modular converter 402 and sending module 403.

Receiver module 401; Be used to receive first PATH that sends from the source fringe node; Said first PATH carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of source node, the address information of destination node and said source node distribute;

Modular converter 402; Being used for the said first path message conversion is second PATH; Said second PATH carries said session sign and the 2nd session sign; Said the 2nd session sign comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes make the core node in the core network identify with the session of said the 2nd session sign as label switched path;

Sending module 403; Be used for the said second PATH hop-by-hop is sent to said outlet core node; Make said outlet core node said second PATH is reduced to first PATH according to said session sign; And said first PATH sent to said destination node, to set up label switched path.

Wherein, modular converter 402 comprises:

Confirm the unit, be used to obtain the address information of place fringe node, search pre-configured User Network Interface UNI information, the address information of definite outlet core node that links to each other with said destination node according to the address information of said place fringe node; Said pre-configured UNI information comprises: the address information of the address information of said source fringe node, the inlet core node corresponding with said source fringe node, the address information of the address information of said place fringe node, the outlet core node corresponding with said place fringe node;

Allocation units; The address information that is used for according to the definite outlet core node in said definite unit is that label switched path distributes Tunnel Identifier; Obtain second session identification, said second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes;

The replacement unit is used for said first session identification that said first PATH carries is replaced with said second session identification, obtains second PATH, comprises said first session identification and said second session identification in said second PATH.

Referring to Fig. 8, the system that the embodiment of the invention also provides a kind of label switched path to set up comprises: aforesaid inlet core node 601 and outlet core node 602;

Said outlet core node 602 is used to receive second PATH that said inlet core node hop-by-hop sends; According to first session identification, said second PATH is reduced to first PATH, said first PATH is sent to destination node, to set up label switched path.

The beneficial effect of device embodiment provided by the invention is: first session identification that carries in first PATH at inlet core node place is changed second session identification; Second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes; Second session label information is unique at the inlet core node to the path of outlet core node; Core node in the core network is with the session identification of said second session identification as label switched path; Cause the node in the core network can not correctly distinguish different label switched paths thereby solved, can't set up the problem of correct label switched path because source node is identical with inlet core node address.And owing to be second PATH with the first path message conversion at inlet core node place; Make core node in the core network with the session identification of said second session identification as label switched path; Even the addressing space of the addressing space of overlay network and core network is different like this; Node on the core net still can read second PATH after the conversion, thereby also can solve the problem that can't correctly set up label switched path because addressing mode is different.

Referring to Fig. 9, the embodiment of the invention provides a kind of server, comprising: receiver module 501, modular converter 502 and forwarding module 503.

Receiver module 501; Be used for receiving from path, source fringe node first via footpath message; Said first PATH carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of said source node, the address information of destination node and said source node distribute;

Modular converter 502; Being used for the said first path message conversion is second PATH; Said second PATH carries said first session identification and second session identification; Said second session identification comprises: the Tunnel Identifier that address information and the said inlet core node of the address information of said inlet core node, outlet core node distributes makes core node in the core network with the session identification of said second session identification as label switched path;

Forwarding module 503; Be used for said second PATH is sent to said inlet core node; Make said inlet core node that the said second PATH hop-by-hop is sent to said outlet core node; Said outlet core node is reduced to first PATH according to said second session identification with said second PATH, said first PATH is sent to said destination node, to set up label switched path.

Wherein, modular converter 502 comprises:

Confirm the unit, be used to obtain the address information of place fringe node, search pre-configured User Network Interface UNI information, confirm the outlet core node that links to each other with said place fringe node according to the address information of said place fringe node; Said pre-configured UNI information comprises: the address information of the address information of said source fringe node, the inlet core node corresponding with said source fringe node, the address information of the address information of said place fringe node, the outlet core node corresponding with said place fringe node;

Allocation units; The address information that is used for according to said outlet core node is that label switched path distributes Tunnel Identifier; Obtain second session identification, said second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes;

The replacement unit is used for said first session identification that said first PATH carries is replaced with said second session identification, obtains second PATH, and said second PATH comprises said first session identification and said second session identification.

Referring to Figure 10, the system that a kind of label switched path is set up comprises: the server 703 at aforesaid server 701, inlet core node 702 and outlet core node place;

Said inlet core node 702 is used to receive second PATH that said server 701 sends, and the said second PATH hop-by-hop is sent to the server 703 at said outlet core node place;

The server 703 at said outlet core node place is used for according to first session identification second PATH being reduced to first PATH, first PATH is sent to destination node, to set up label switched path.

The beneficial effect of system embodiment provided by the invention is: first session identification that carries in first PATH at inlet core node place is changed second session identification; Second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes; Second session label information is unique at the inlet core node to the path of outlet core node; Core node in the core network is with the session identification of said second session identification as label switched path; Cause the node in the core network can not correctly distinguish different label switched paths thereby solved, can't set up the problem of correct label switched path because source node is identical with inlet core node address.And owing to be second PATH with the first path message conversion at inlet core node place; Make core node in the core network with the session identification of said second session identification as label switched path; Even the addressing space of the addressing space of overlay network and core network is different like this; Node on the core net still can read second PATH after the conversion, thereby also can solve the problem that can't correctly set up label switched path because addressing mode is different.

Device that present embodiment provides and system specifically can belong to same design with method embodiment, and its concrete implementation procedure sees method embodiment for details, repeats no more here.

The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the method set up of a label switched path is characterized in that said method comprises:

2. method according to claim 1 is characterized in that, said is second PATH with the said first path message conversion, comprising:

Obtain the address information of place fringe node, search pre-configured User Network Interface information, the address information of definite outlet core node that links to each other with said place fringe node according to the address information of said place fringe node; Said pre-configured User Network Interface information comprises: the address information of the address information of said source fringe node, the inlet core node corresponding with said source fringe node, the address information of the address information of said place fringe node, the outlet core node corresponding with said place fringe node;

3. according to each described method of claim 1-2, it is characterized in that, also carry the port-mark of said source node or the port-mark of said inlet core node in said first PATH, be used to indicate the User Network Interface that said source node is selected;

4. according to each described method of claim 1-3, it is characterized in that, also carry first label switched path sign in said first PATH; Then said second PATH carries second label switched path sign and said first label switched path sign, and said second label interaction path sign is that said inlet core node is that label switched path distributes.

5. according to each described method of claim 1-4, it is characterized in that, the said second PATH hop-by-hop sent to after the said outlet core node, also comprise:

Said outlet core node receives said second PATH;

6. according to each described method of claim 1-5, it is characterized in that, also carry the network identity at said source node place in said first PATH, be used to show the network at said source node place.

One kind the inlet core node, it is characterized in that said node comprises:

8. node according to claim 7 is characterized in that, said modular converter comprises:

Confirm the unit, be used to obtain the address information of place fringe node, search pre-configured User Network Interface information, the address information of definite outlet core node that links to each other with said place fringe node according to the address information of said destination node; Said pre-configured User Network Interface information comprises: the address information of the address information of said source fringe node, the inlet core node corresponding with said source fringe node, the address information of the address information of said place fringe node, the outlet core node corresponding with said place fringe node;

Allocation units; The address information that is used for according to the definite said outlet core node in said definite unit is that label switched path distributes Tunnel Identifier; Obtain second session identification, said second session identification comprises: the address information of the address information of said inlet core node, outlet core node and the Tunnel Identifier that said inlet core node distributes;

9. the method set up of a label switched path is characterized in that said method comprises:

10. method according to claim 9 is characterized in that, said is second PATH with the said first path message conversion, comprising:

11. a server is characterized in that, said server comprises:

Receiver module; Be used to receive path first PATH that sends from the source fringe node; Said first PATH carries first session identification, and said first session identification comprises: the Tunnel Identifier that the address information of source node, the address information of destination node and said source node distribute;

12. server according to claim 11 is characterized in that, said modular converter comprises:

Confirm the unit, be used to obtain the address information of place fringe node, search pre-configured User Network Interface information, the address information of definite outlet core node that links to each other with said place fringe node according to the address information of said place fringe node; Said pre-configured User Network Interface information comprises: the address information of the address information of said source fringe node, the inlet core node corresponding with said source fringe node, the address information of the address information of said place fringe node, the outlet core node corresponding with said place fringe node;

13. the system that label switched path is set up is characterized in that said system comprises: like each described inlet core node of claim 7-8 and outlet core node;

14. the system that label switched path is set up is characterized in that said system comprises: like the server at each described server of claim 11-12, inlet core node and outlet core node place;