CN101147348A

CN101147348A - Automatic exchange optical network layered route calculation and connection establishing method

Info

Publication number: CN101147348A
Application number: CNA2005800493120A
Authority: CN
Inventors: 高鹏
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2005-07-28
Filing date: 2005-07-28
Publication date: 2008-03-19
Anticipated expiration: 2025-07-28
Also published as: WO2007012223A1; CN101147348B

Abstract

A method for automatically switched optical network hierarchy routing calculating and connection establishing, comprises the steps: a), configures each routing area of the optical network and its speaker, forms hierarchy topological relation that can calculate routing by the interaction between the various hierarchies and broadcasting within the routing areas; b) after the entrance network element receives the connection establishing request, sends it to the entrance connection controller CC1 of the routing area RA1;c) each routing area which receives the connection request searches the routing in the routing area by the entrance connection controller, and originates connection establishing, if it is bottom hierarchy routing area, completes the establishment of the optical mark channel in the routing area, proceeds step e), or else, proceeds step d);d) each node connection controller on the routing in the area sends sub network connection establishing request to the corresponding connection controller of the next hierarchy routing area speaker, returns to step c); e) each routing area returns the connection establishing result hierarchy and hierarchy to the entrance network element. The method of the invention makes the signaling interaction process of the routing calculating and the connection establishing hierarchically and consecutively, and is beneficial to complete the connection establishing rapidly.

Description

The method that automatic exchange optical network layered router-level topology and connection are set up

The method and technology field that automatic exchange optical network layered router-level topology and connection are set up

The present invention relates to ASON（ASON :Automatically Switched Optical Network) field, the method that router-level topology and connection are set up more particularly in hierarchical structure optical-fiber network.Background technology

In recent years, the communication service such as speech, data, video develops further towards synthesization direction, and Internet total business volumes are increased with the speed be doubled in explosion type every year, is changed into swallowing the main force of backbone bandwidth.According to statistics, the annual growth of voice portfolio is only 10% in world wide, and the annual growth of data service reaches 40%, China's data service annual growth then more than 400%, develop it is extremely swift and violent.The continuous growth of portfolio, along with features such as the sudden of Internet business itself presence, self-similarity and lacks of uniformity, it is meant that designed at present towards speech, the SDH/SONET transmission net systems based on circuit switching need to carry out overall upgrading and renewal to data-centered New Generation Optical network.

In order to adapt to the rapid emergence of data service, it was recognized that the thinking of development of optical-fiber network can not be limited only in terms of improving transmission capacity, it is often more important that how to give full play to by routeing and exchanging the networking flexibility brought after shift-in photosphere.Optical-fiber network intelligence is assigned by the protocol means automatically controlled in increase, this network by IP efficiency, DWDM capacity, SDH/SONET robustness, it is combined together with advanced control software, optical-fiber network is obtained unprecedented flexibility and upgradability.ASON is exactly one of which good solution.

After the appearance of ASON network technologies, distributed connection is set up the centralization connection that instead of in conventional optical network and set up in ASON networks, each node is respectively provided with connection route and calculated and selective power, so requires to carry out communication network topology information using Routing Protocol.In order to solve after network size expansion, routed domain（RA ：Routing Area) in the network topological information propagated the problem of sharply increase and have a strong impact on network performance, propose the scheme of hierarchy type route, namely split the network into the routed domain of different levels, limitation carries out the scope of Routing Information Exchange by " flooding ", and G.8080 what ITU-T was drafted gives route domain hierarchy and sub-network point pool（SNPP G.7715 relation), elaborate ASON road By topology requirement.

At present, light network forum（OIF) proposing one, (Open Shortest Path First using OSPF）The hierarchy routing draft of protocol extension, the draft is illustrated with regard to the basic framework of hierarchy routing.But, automatic exchange optical network layered router-level topology and connection are set up, need to set up demand signalling interaction with the distributed progress router-level topology of interlayer and connection in layer, this is all not specified by corresponding exchange method in standard suggestion and agreement, can also utilize without existing method.

The content of the invention

The technical problem to be solved in the present invention is to provide a kind of method that automatic exchange optical network layered router-level topology and connection are set up, route is calculated in the way of hierarchy routing for the optical-fiber network with hierarchical structure, signal passage is set up.

For clear accurate, the characteristics of first the advising with reference to ASON hierarchy routing standards and embody the inventive method of statement, the following concept of definition：

Node：With control plane path control deivce（RC controller), is connected（The control point of function such as CC).Ingress node：Refer to the connection foundation request for being used for receiving that other nodes are sent in user, other routed domains or domain in a domain, complete the node that intra-area routes are calculated.Ingress node corresponds to specific connection and sets up request, and different business, Ingress node may be different.

Endorsement point（Speaker) ：One specified in routed domain is used for the special joint communicated with upper layer node, the path control deivce of endorsement point（RC) in addition to conventional Routing Protocol task is completed as with other nodes, it is also responsible for and upper one route corresponding path control deivce communication on level, meanwhile, the connection controller of endorsement point（CC) it is responsible for receiving upper strata connection request and returning to connection setting up result, if endorsement point is not the Ingress node of the connection request, the connection request in the upper strata domain received need to be sent to the corresponding Ingress node in this domain.

In order to solve the above-mentioned technical problem, the invention provides a kind of method that automatic exchange optical network layered router-level topology and connection are set up, applied to the optical-fiber network with hierarchical structure, comprise the following steps：

(a) each routed domain and its endorsement point in the optical-fiber network are configured, the broadcast for interacting routing iinformation in interlayer by endorsement point and being route in domain forms the complete layer for carrying out router-level topology Secondary topological relation；

(b) entrance network element is received after the connection foundation request of user, is sent to connection the controller CC1, domain RA1 of correspondence Ingress node on routed domain RA1 while comprising the routed domain where the service source network element and purpose network element；

(c) each routed domain for receiving connection request obtains intra-area routes by the connection controller Check inquiry path control deivces of its Ingress node, connection is initiated in domain and sets up process, if the domain is bottom domain, the foundation of signal passage in domain is completed, step is performed（E), if there be the lower floor domain included in the domain, step is performed（d) ；

(d) connection that the connection controller of each node sends subnet to the connection controller of the endorsement point in its corresponding next layer of domain again on the intra-area routes, which is set up, asks, return to step（c) ；

(e) connection is set up the connection controller CC1 that result successively returns to routed domain RA1 by the connection controller of its endorsement point upwards by each routed domain for receiving connection request, again returns to the entrance network element that initial launching connection is set up.

Further, the above method can also have the characteristics that：The step（A) in, the interaction of interlayer routing iinformation is carried out by the path control deivce of the path control deivce of endorsement point in each domain and its upper strata domain corresponding node, this layer of path control deivce is then that the network topology in domain is understood by the process that " flooded " in domain so that the routing iinformation for all lower floor's routed domains that the path control deivce of each node is all included with this domain and this domain in routed domain.

Further, the above method can also have the characteristics that：The step（B) in, the entrance network element is that routed domain RA1 that connection request should be sent to is determined according to the domain inclusion relation obtained from LIST SERVER.

Further, the above method can also have the characteristics that：The step（A) in, to each endorsement point, a corresponding path control deivce is configured for it in its last layer domain.Further, the above method can also have the characteristics that：The step（C) during the connection in routed domain is set up, the connection controller of certain node, which receives connection and set up after message, in route consults distribution link connection, into this domain, the connection controller of next node sends connection and sets up message again, if the path control deivce of the node corresponds to a next layer of domain and the next layer of domain is that Subnetwork connection is covered Routed domain, then the connection controller of the node will also to the next layer of domain endorsement point connection controller send Subnetwork connection set up ask.

Further, the above method can also have the characteristics that：Connection in the routed domain sets up process using RS VP signaling procedures.

Further, the above method can also have the characteristics that：The step（D) each node connects the endorsement point in the corresponding next layer of domain of controller in, refers to the endorsement point in the path control deivce that the same node of controller is connected with this next layer of domain corresponding in configuration.

Further, the above method can also have the characteristics that：The step（D) in, the connection controller of endorsement point receives Subnetwork connection and set up after request, if the endorsement point is not the Ingress node of the connection request, needs the Subnetwork connection setting up request and is sent to the corresponding Ingress node in this domain.

Further, the above method can also have the characteristics that：The step（E) in, result is set up in the connection that next node is returned on it have received route of the connection controller of each node on each intra-area routes, when being the routed domain that Subnetwork connection is covered corresponding to next layer of domain and the next layer of domain, the connection that also receive domain endorsement point connection controller return is set up after result, connection is returned to its previous node set up result again, when the connection received is set up result and succeeded, return to the result that connection is successfully established, otherwise, the result of failure is returned, and resource releasing processing is carried out to established connection.

Further, the above method can also have the characteristics that：In this method, the signalling interactive process between the different routed domains without inclusion relation is parallel procedure.

As from the foregoing, the method set up using the automatic exchange optical network layered router-level topology and connection of the present invention, router-level topology and connection can be made to set up interaction stratification, the methodization of signaling, while hierarchy routing connection is set up and carried out parallel, it is that quick connection foundation provides the foundation.Summary of drawings

Fig. 1 is the structural representation of lamina optical network of the embodiment of the present invention.

Fig. 2 is the corresponding relation figure of path control deivce of the embodiment of the present invention and lower floor's network domains.

Fig. 3 is the Signalling exchange schematic diagram that connection of the embodiment of the present invention is set up. The preferred forms of the present invention

First illustrate the lamina optical network structure of the present embodiment with reference to Fig. 1 below.

As shown in figure 1, the network is constituted by four layers, the routed domain that each layer is not waited by quantity is constituted.Each routed domain is made up of control plane component and transport plane resource, physically associated with a number of network element comprising control plane logical process plate, and each control plane logical process plate includes connection controller（CC), path control deivce（RC), Link Resource Manager（) etc. LRM control plane processing function, logically, will have control plane path control deivce（RC controller), is connected（) etc. CC the control point of function is referred to as node.The path control deivce and connection controller that same numbering is mentioned below refer to the different control functions module of same node on physical layer, and such as path control deivce N123 and connection controller N123 refer to the different control functions of same node.The part of nodes in domain is merely illustrated in figure.

The bottom of Fig. 1 lamina optical network structures includes seven routed domains：L1RAK L1RA2, L1RA3, L1RA4, L3RA2, L2RA3, L2RA4, bottom here refer to the layer near transport plane, and although L3RA2 and L2RA3, L2RA4 are three layers and two layers in logic, but belong to bottom.Network element node Nl l l, N112, N121, N122, N13 N132, N141, N142, N321, N322, N23 N232, N241, N242 are the transport layer network elements for being physically present light connects, routed domain L1RA1 realizes that other bottom routed domains are similar with routed domain L1RA1 by network element Nl l l, N112 and control plane logical process function.

Routed domain L2 A1, L2RA2, L2RA3, L2RA4 constitute the second layer in logic, and routed domain L3RA1, L3RA2, L3 A3 constitute third layer in logic, and routed domain L4RA constitutes the 4th layer in logic.

Routed domain L4RA and routed domain L3RA1, L3RA2, relation between L3RA3, routed domain L3RA1 and routed domain L2RA1, relation between L2RA2, relation between routed domain L3RA3 and routed domain L2RA3. L2RA4, routed domain L2RA1 and routed domain L1RA1, relation and routed domain L2RA2 and routed domain L1RA3 between L1RA2, relation between L1RA4 meet that G.8080 ITU-T advise comprising strategy, hereinafter by routed domain L3RA1, L3RA2, L3RA3 is referred to as the next layer of domain that routed domain L4RA is included, the next layer of domain L2RA1 that domain L3RA1 is included, L2RA2 is referred to as the routed domain that its last layer domain L4RA is included, it is other to analogize with this. User first passes through management plane and configures optical network layered structure and the endorsement point in domain.The filling network element node of black is the endorsement point specified by management plane in Fig. 1, to each endorsement point, and a corresponding path control deivce is configured for it in its last layer routed domain.

In Fig. 1, node Nl l l, N12 N131, N141 are respectively routed domain L1RA1, L1RA2, L1RA3, L1RA4 endorsement point, and node N211, N212, N221, N222 are the node of endorsement point Nl l l, N121, N131, N141 on the second layer where corresponding path control deivce respectively.Node N212, N221 are respectively the endorsement point of routed domain L2RA1, L2RA2, and node N311, N312 are node of endorsement point N212, N221 in third layer where corresponding path control deivce respectively.Node N311 is routed domain L3RA1 endorsement point, and node N411 is nodes of the endorsement point N311 on the 4th layer where corresponding path control deivce.Node N321 is routed domain L3RA2 endorsement point, and node N412 is nodes of the endorsement point N321 on the 4th layer where corresponding path control deivce.Node N231, N241 are respectively the endorsement point of routed domain L2RA3, L2RA4, and node N331, N332 are node of endorsement point N231, N241 in third layer where corresponding path control deivce respectively.Node N331 is routed domain L3RA3 endorsement point, and node N413 is nodes of the endorsement point N331 on the 4th layer where corresponding path control deivce.L4RA domains are top layer routing control fields, without endorsement point.

This layer of path control deivce understands the network topology in domain by the process that " flooded " in domain, some path control deivces in this layer of domain are also responsible for the endorsement point communication of corresponding lower floor's routed domain, understand the routing iinformation of its corresponding lower floor's routed domain and in this routed domain " flooding " distribution, form the stable hierarchical topology relation for carrying out router-level topology, the routing iinformation for all lower floor's routed domains that the path control deivce of each node is included with this routed domain and this routed domain in each routed domain, each node can respond routing inquiry request, calculate intra-area routes.Fig. 2 shows the corresponding relation of path control deivce and the routing control field of lower floor's network.Path control deivce such as node N211 corresponds to routing control field L1RA1, and node N212 path control deivce corresponds to routing control field L1RA2, etc..

Illustrate the flow of the embodiment of the present invention with reference to Fig. 1, Fig. 2 and Fig. 3.Fig. 3 is the Signalling exchange schematic diagram that the present embodiment layering route connection is set up, and the straight line that S+ numerals are labeled with figure represents the repeating process of signaling, digital hundred and tens represented program number, units represent during different disposal example.The units of signaling procedure represents the order of signaling procedure in same domain, disregards the processing time that signaling is set up in connection.It should be noted that, although by the Signalling exchange mistake between not same area in flow below Journey is write in a step, but is intended merely to statement simply, and the signalling interactive process between same area is not parallel procedure, without orbution.

As shown in Figure 2, it is assumed that user sets up a connection from network element Ni l 1 to network element N242 to optical-fiber network request, what user specified network element N111 enters mark（Label) and network element N242 goes out mark, " mark " here refer to above and below business point, corresponding physical concept can be some port in equipment.This process is as shown in the process 11 in Fig. 3.

Step 1, entrance network element N111 receives the connection request of user, according to domain inclusion relation, controller N411 is connected it is determined that connection is set up into request and is sent directly to corresponding entrance in the 4th layer of routed domain L4RA, this process is shown with process S11 in figure 3；

Here, if domain where the source and destination of business needs cross-layer to solve, it is accomplished by connecting and sets up the routed domain that request is sent to upper strata, it is specific to need across several layers of, it can be determined according to the domain inclusion relation of a variety of methods acquisitions such as " LIST SERVER ", the upper strata domain is needed simultaneously comprising the domain where the business two ends network element.

Step 2, connection controller N411 inquires about the path control deivce of this node, and the route results that path control deivce N411 is calculated in the L4RA of domain are N411<→N412<—>N413, then connects controller N411 and initiates connection successively to connection controller N412, connection controller N412 to connection controller N413 again and set up process, this process is shown with process S21 and process S22 in figure 3；

It is not construed as limiting for the specific method present invention that intra-area routes are calculated.Process is set up in connection in domain can use RSVP signaling procedures, node N412 connection controller, which is received, consults distribution link connection after Path message, into this domain, next node N413 connection controller sends Path message, if the path control deivce of the node（Or other corresponding path control deivces）Corresponding to comprising next layer of domain, then its connect controller also need to the next layer of domain endorsement point connection controller send Subnetwork connection set up request.

Step 3, connection controller N411, N412 and N413 in the L4RA of domain receive connection and set up after request, inclusion relation based on routed domain judges the gateway network element for the next layer of routed domain that Subnetwork connection is covered, and Subnetwork connection is set up into request is sent to and same node（Also can specially it specify）Path control deivce corresponding to lower floor's network endorsement point N311, N321 and N331, this process in figure 3 with Process S31, S32 and S33 are shown, if the path control deivce of the upper node of route does not have corresponding next layer of routed domain or the next layer of domain not to be the routed domains that Subnetwork connection is covered, and avoid the need for sending Subnetwork connection foundation request；

Step 4, domain L3RA1 and L3RA3 endorsement point N311 and N331 are also the Ingress node of the connection simultaneously, after Subnetwork connection foundation request is received, intra-area routes are calculated respectively in domain L3RA1 and L3RA3, the route results that endorsement point N311 is calculated in the L3RA1 of domain are N311<—>N312, the route results that endorsement point N331 is calculated in the L3RA3 of domain are N331<—>N332, endorsement point N311 and endorsement point N331 initiate connection to N312 and N332 respectively and set up process, this process is shown with process S41 and process S42 in figure 3 according to router-level topology result；

Step 5, Subnetwork connection is set up endorsement point N212 and N221 that request is sent to the corresponding lower floor's network of same node-routing controller by the connection controller N311 and N312 in the L3RA1 of domain according to the inclusion relation of routed domain;Equally, Subnetwork connection is set up endorsement point N231 and N241 that request is sent to the corresponding lower floor's network of same node-routing controller by the connection controller N331 and N332 in the L3RA3 of domain.This process is shown with process S51, S52, S53 and S54 in figure 3；

Step 6, domain L2RA1 and L2RA2 endorsement point N212 and N221 receive Subnetwork connection and set up after request, in the L2RA1 of domain, endorsement point N212 is not the Ingress node of Subnetwork connection, need Subnetwork connection setting up the Ingress node N211 that request is sent to the domain, this process is shown in Fig. 3 with process S55；Endorsement point in domain L2RA1 interior nodes N211 and domain L2RA2（It is also Ingress node）N221 calculates intra-area routes respectively, and the route results that node N211 is calculated in the L2RA1 of domain are N211<— >N212, the route results that endorsement point N221 is calculated in the L2RA2 of domain are N221<→ N222, node N211 and endorsement point N221 initiate connection to N212 and N222 respectively and set up process according to router-level topology result.This process is shown with process S61 and process S62 in figure 3；

Step 7, according to the inclusion relation of routed domain, Subnetwork connection is set up endorsement point Nl 11 and N121 that request is sent to the corresponding lower floor's network of same node-routing controller by the connection controller N211 and N212 in the L2RA1 of domain；Equally, Subnetwork connection is set up endorsement point N131 and N141 that request is sent to the corresponding lower floor's network of same node-routing controller by the connection controller N221 and N222 in the L2RA2 of domain, and this process is shown with process S71, S72, S73, S74 in figure 3；

Step 8, bottom routed domain L1RA1, L1RA2, L1RA3, L1RA4, L3RA2, L2RA3, L2RA4 endorsement point（It is also Ingress node）Connection controller Nl l l, N12 N131, N141, N321, N23 N241 receive the route calculated after Subnetwork connection request in respective domain, result of calculation is respectively： N111<—>N112、 N121<— >N122、 N131<—>N132、 N141<—>N142、 N32K— >N322, N231<— >232 N24K → N242, carry out the connection in each domain as shown by dotted lines in figure 3 and set up process, carry out signal path in domain（Data transmission channel）Foundation.What bottom domain was carried out is that actual data path sets up process, each bottom domain is all successfully established, whole piece business is just created successfully, and data flow will reach outlet network element N242 from entrance network element N111 by network element N112, N12 N122, N13 N132, N141, N142, N32 N322, N23 N232, the N241 in each bottom domain.

The connection controller of each domain interior nodes will connect and set up the connection controller that result returns to endorsement point in domain（If endorsement point non-portal nodes, connection is first set up the connection controller that result returns to Ingress node by each node, then is sent to by it connection controller of domain endorsement point）, will be connected by endorsement point Nl l l, N12K N13 N141, N321, N23 N241 connection controller and set up result and return to the connection controller for being sent to the last layer for setting up connection request route domain node N211, N212, N22 N222, N412, N331, N332.This process is shown with process S81, S82, S83, S84, S85, S86, S87 in figure 3;

Step 9, the connection that next layer of domain return is received in domain L2RA1, L2RA2 set up connection controller N212, N222 of result and the connection controller that result returns to this realm entry node N211, N221 respectively is set up into the connection, this process is as shown in process S88, S92 in Fig. 3.Because N211 is not endorsement point, the connection controller that result re-sends to this domain endorsement point N212 also is set up into the connection, this process is as shown in the process S91 in Fig. 3；

Step 10, the connection controller of domain L2RA1, L2RA2 endorsement point N212, N221, which will be connected, sets up result and returns to the connection controller for being sent to the last layer for setting up connection request route domain node N311, N312.This process is as shown in process S101, S102 in Fig. 3；

Step 11, next layer of domain is received in domain L3RA1, L3RA3 return to connection and set up connection controller N311, N312 of result and the connection controller that result returns to this realm entry node N311, N331 respectively is set up into the connection, as shown in process Sl l l, S112 in Fig. 3；

Step 12, the connection controller of domain L3RA1, L3RA3 endorsement point N311, N331, which will connect to set up result and return to, is sent to the last layer for setting up connection request route domain node N411, N413 Connection controller.As shown in process S121, S122 in Fig. 3；

Step 13, next layer of domain is received in the L4RA of domain return to connection and set up the connection controller N413 of result and connect and set up the connection controller that result returns to N412, connection is set up the connection controller that result returns to this realm entry node N411 by N412 connection controller again, as shown in process S131, S132 in Fig. 3；

Step 14, the connection that node N411 connection controller is received in domain with interlayer is set up after result, returns result to the node Nl l l that initial launching connection is set up.As shown in the process N141 in Fig. 3.

In embodiment, interlayer Subnetwork connection sets up the connection controller that request is destined to next layer of domain endorsement point, if endorsement point is not the Ingress node of Subnetwork connection, the Subnetwork connection is also set up into the connection controller that request is transmitted to the realm entry node, router-level topology is carried out by it, and initiate connection and set up process, the mode that calculating is a kind of " source routing " is carried out by Ingress node, can be with simplified signaling interaction.

Result is set up in the connection that next node is returned on it have received route of the connection controller of each node on the intra-area routes, when corresponding to next layer of domain, the connection that also receive domain endorsement point connection controller return is set up after result, connection is returned to its previous node set up result again, when the connection received is set up result and succeeded, the result that connection is successfully established is returned, otherwise, the result of failure is returned to.So, as long as receiving, the router-level topology for any routed domain asked is set up in connection or failure is set up in connection, then it is assumed that whole connect sets up failure, and failure information is returned to the entrance network element, and the connection being set up to oneself carries out resource releasing processing.

In summary, the interaction for the layering routing inquiry information that the present invention is used, in network size than there is provided a kind of well arranged clear router-level topology querying method of orderliness in the case of larger.

Industrial applicibility

The method that the automatic exchange optical network layered router-level topology of the present invention and connection are set up can apply to ASON, router-level topology and connection is set to set up interaction stratification, the methodization of signaling, parallel progress is set up in hierarchy routing connection simultaneously, is that quick connection foundation provides the foundation.

Claims

Claims

1st, a kind of method that automatic exchange optical network layered router-level topology and connection are set up, applied to the optical-fiber network with hierarchical structure, comprises the following steps：

(a) each routed domain and its endorsement point in the optical-fiber network are configured, the broadcast for interacting routing iinformation in interlayer by endorsement point and being route in domain forms the complete hierarchical topology relation for carrying out router-level topology；

(b) entrance network element is received after the connection foundation request of user, is sent to connection the controller CC1, domain RA1 of correspondence Ingress node on routed domain RA1 while comprising the routed domain where the service source network element and purpose network element；

(c) each routed domain for receiving connection request obtains intra-area routes by the connection controller query routing controller of its Ingress node, connection is initiated in domain and sets up process, if the domain is bottom domain, the foundation of signal passage in domain is completed, step is performed（E), if there be the lower floor domain included in the domain, step is performed（d) ；

(d) connection that the connection controller of each node sends subnet to the connection controller of the endorsement point in its corresponding next layer of domain again on the intra-area routes, which is set up, asks, return to step（c) ；

(e) connection is set up the connection controller CC1 that result successively returns to routed domain RA1 by the connection controller of its endorsement point upwards by each routed domain for receiving connection request, again returns to the entrance network element that initial launching connection is set up.

2nd, the method as described in claim 1, it is characterised in that the step（A) in, the interaction of interlayer routing iinformation is carried out by the path control deivce of the path control deivce of endorsement point in each domain and its upper strata domain corresponding node, this layer of path control deivce is then that the network topology in domain is understood by the process that " flooded " in domain so that the routing iinformation for all lower floor's routed domains that the path control deivce of each node is all included with this domain and this domain in routed domain.

3rd, the method as described in claim 1, it is characterised in that the step（B) in, the entrance network element is that routed domain RA1 that connection request should be sent to is determined according to the domain inclusion relation obtained from LIST SERVER.

4th, the method as described in claim 1, it is characterised in that the step（A) in, to each Individual endorsement point, a corresponding path control deivce is configured in its last layer domain for it.

5th, method as claimed in claim 4, it is characterised in that the step（C) during the connection in routed domain is set up, the connection controller of certain node, which receives connection and set up after message, in route consults distribution link connection, into this domain, the connection controller of next node sends connection and sets up message again, if it is the routed domain that Subnetwork connection is covered that the path control deivce of the node, which corresponds to a next layer of domain and the next layer of domain, the connection controller of the node will also send Subnetwork connection to the connection controller of the next layer of domain endorsement point and set up request.

6th, method as claimed in claim 5, it is characterised in that the connection in the routed domain sets up process using RS VP signaling procedures.

7th, method as claimed in claim 4, it is characterised in that the step（D) each node connects the endorsement point in the corresponding next layer of domain of controller in, refers to the endorsement point in the path control deivce that the same node of controller is connected with this next layer of domain corresponding in configuration.

8th, the method as described in claim 1, it is characterised in that the step（D) in, the connection controller of endorsement point receives Subnetwork connection and set up after request, if the endorsement point is not the Ingress node of the connection request, needs the Subnetwork connection setting up request and is sent to the corresponding Ingress node in this domain.

9th, method as claimed in claim 4, it is characterised in that the step（E) in, result is set up in the connection that next node is returned on it have received route of the connection controller of each node on each intra-area routes, when being the routed domain that Subnetwork connection is covered corresponding to next layer of domain and the next layer of domain, the connection that also receive domain endorsement point connection controller return is set up after result, connection is returned to its previous node set up result again, when the connection received is set up result and succeeded, return to the result that connection is successfully established, otherwise, the result of failure is returned, and resource releasing processing is carried out to established connection.

10th, the signalling interactive process between the method as described in claim 1, it is characterised in that in this method, the different routed domains without inclusion relation is parallel procedure.