KR20100073963A - Multi-layer transport network and te link management method about fa-lsp between the layers at the multi-layer transport network - Google Patents

Abstract

PURPOSE: A resource management method between multi-layered networks is provided to embody transmission path management and network resource management about the multi-layer transmission resources. CONSTITUTION: A node1(5), a node 2 and a node 3 proceed switching and control to an upper layer(3), a middle layer(2) and a lower layer(1) about their resources. A node 4(6) performs switching and control about resources of the middle layer and the lower layer. A node 5(7) performs switching and controlling resources of the lower layer. Each node forms TE(Traffic Engineering) link resources(8,9,10) connected to the adjacent node. Each node offers a service transmission path through the link resource.

Description

Multi-layer transport network and TE link management method about FA-LSP between the layers at the multi-layer transport network}

The present invention relates to a multi-layer network and a resource management method thereof. The inter-layer for FA-LSP of a multi-layer network capable of efficiently managing network resources and transmission paths by dynamically generating and managing a required path. TE link resource management method.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunication Research and Development. [Task management number: 2008-S-009-01, Task name: Packet-optical integrated switch technology development] ].

Multi-layer transport network that provides multiple layers of transmission path resources such as optical, time division multiplexing (TDM) and Ethernet at the same time is generalized to automate network resource management and transmission path management for rapid application of services and efficient control of transmission resources. Multi Protocol Label Switching) is a trend to apply and operate.

The GMPLS protocol is standardized as a protocol that can be generalized to various layers of resources with different intertransmission characteristics such as optical, TDM, Ethernet, and packet, and the switching paths of these various layers can be operated together on the same device and the same network. Many requirements and standardization for multi-layer and multi-region are progressed.

In order to establish an end-to-end path of a specific client layer in a multi-layer and multi-domain transport network, a lower server layer transmission path using a transmission resource of a lower layer may be required. At this time, the GMPLS signaling of the upper client layer requires the setting of the lower server layer transmission path as a resource for the transmission path of the client layer with the lower server layer GMPLS signaling.

Calls generated between layers in the same GMPLS signaling unit in the same equipment are called inter-layer calls, and the path generated by this procedure is called FA-LSP. The upper layer must be managed as a TE link so that it can be used as one data link that can be considered for path selection. The lower layer FA-LSP may be generated in advance by the operator's manual setup at the request of the upper layer, but many studies and standardizations have triggered signaling that automatically automates the initiation of inter-layer call. Is oriented. However, there are only requirements for triggered signaling at present, and there are no technical solutions.

An object of the present invention is to superimpose FA_LSP generated according to inter-layer call processing procedure of a lower server layer as a TE link for a data link resource for responding to a routing request in a multi-layer multi-domain network in which the GMPLS protocol is operated. It is to provide a multi-layer network and its resource management method that automate a series of processes to manage as a resource for the layer and use it as routing information.

In addition, triggering signaling between layers using a technical method in a signaling procedure so that the FA-LSP of the lower layer dynamically generated by the request of the upper layer can be automatically and automatically managed as the TE link of the upper layer. Multi-layer network and its resource management for inter-layer TE link resource management for FA-LSP in multi-layer transport network to maximize network resource utilization efficiency by realizing automated and efficient network resource management and transmission warning management of multi-layer transport network In providing a method.

The multi-layer network according to the present invention includes a switching processing function of at least one of packet switching processing, time division switching processing, and optical fiber switching processing to process and route signals for at least one of the plurality of layers. A node of the node, the node manages resource and packet transmission for each layer, manages a path of a lower server layer through a traffic engineering (TE) -link, and responds to a request for establishing a path to the node and the available link. And setting the requested transmission path by access path search.

In addition, the resource management method of the multi-layer network of the present invention, in the resource management method of the multi-layer network, when a path setting request is received from the node constituting the multi-layer network to the first layer, Searching for available connection paths for layer 1; Requesting an inter-layer call establishment to a second layer, which is a lower server layer of the first layer, when there is no available access path; Registering an FA-LSP, which is an available access path from the second layer, into the first layer; And managing the FA-LSP as the TE link of the first layer, and setting a transmission path for the request using the TE link to respond to the request.

The present invention realizes efficient network resource management and transmission path management for multi-layer transmission resources by completing processing methods in the GMPLS signaling, LMP, and routing processes for each FA-LSP generated after the inter-layer call processing procedure is completed. This maximizes the efficiency of network resource utilization.

In addition, the present invention, in the multi-layer and multi-zone transmission network in which the GMPLS protocol is operated, sets up the FA-LSP through an automated call request between layers at a time point where necessary transmission resources are required for each layer, By implementing a function that can be automatically managed as a TE-link, it does not require manual setting of the operator, and minimizes the loss of expensive transmission resources by avoiding pre-allocation of each layer of multi-layer network resources. have.

The present invention focuses on maximizing the use efficiency of multi-layer network resources. To this end, the present invention allows the consideration of a forwarding adjacent-label switching path (FA-LSP), which is a path of a lower server layer required for setting a path of an upper client layer, when selecting a path from an upper client layer. An automated registration procedure and a release procedure are described to enable management.

1 conceptually illustrates the configuration of a multi-layer network in accordance with the present invention.

As shown in FIG. 1, the illustrated multi-layer network is composed of three layers, a lower layer, a middle layer, and a higher layer.

The lower layer 1 (L1, L2) corresponds to the lowest layer, and as an example, an optical transport network that provides transmission resources in units of Lambda corresponds to a lower layer.

The middle layer (2) (M1, M2) corresponds to the upper layer for the lower layer (1) (L1, L2), for example, the transmission resources in time division units according to the Synchronous Digital Hierarchy / Synchronous Optical Network (TDM). This corresponds to a TDM transport network that provides.

The upper layer 3 (U1, U2)) corresponds to the uppermost layer in the illustrated network, which is, for example, a packet transmission network that provides packet transmission resources such as PBB-TE or MPLS-TP. The transmission resources of the layer, the middle layer, and the upper layer may be all provided in one equipment, and in some cases, only some layers of transmission resources may be provided in one equipment. That is, there may be a node having all the transmission resources of the lower layer, the middle layer, and the upper layer, or there may be a node having the transmission resources of the upper layer and the middle layer.

At this time, when the network is composed of a lower layer, a middle layer, and a higher layer, such a network is referred to as a multi-layer resource transport network 4.

The multi-layer resource transport network 4 is composed of at least one node. At this time, each node manages resources for at least one of the upper layer, the middle layer, and the lower layer as described above.

For example, node 1, node 2, and node 3 are switching on their resources for all layers of upper layer 3, middle layer 2, lower layer 1, and so forth. And control is possible. In addition, the node 4 (node4) performs a switching and control function for the resources of the middle layer 2 and the lower layer 1 of the upper layer, the middle layer, and the lower layer. Node5 may perform a switching and control function for the resources of the lower layer 1. Each node node1 to node5 has a switching function or a control function for the lower layer 1, the middle layer 2, and the upper layer 3, thereby forming a TE link resource connected to an adjacent node (8, 9, 10), and provides a transmission path for a service required in each layer through link resources, and allows the TE link to be allocated as a data resource for the transmission path of the upper layer (3).

2 shows a conceptual diagram for a FA-LSP. A label switching path (LSP) is roughly divided into a FA-LSP and a user LSP, and FIG. 2 is a diagram illustrating a user LSP for a transmission service.

As the resources of the lower layer 1, L1 of node 1, L2 of node 2, L3 of node 3, and L4 of node 4 node4 represent resources of the lower layer 1, M1, M3 of node 3, and M2 of node 2 represent resources of the middle layer 2, U1 of node 1, U2 of node 2, and U3 of node 3 represent resources of the upper layer 3. FIG. As shown in the figure, the lower layer resources L1 and L4 (Traffic Engineering) -link 110, TE link 120 of L4 and L3, TE link resources 130 of L3 and L2 are selected as a path. In addition, the transmission path 140 for the lower layer 1 may be set. For example, the lower layer transport path 140 may be provided as a dedicated line service of a fiber unit as a fiber transport path.

The transmission path 150 of the middle layer 2 may provide a leased line service of a Lambda unit, for example, as a Lambda transport path. The transmission path 150 of the middle layer 2 may be set by selecting the TE link 170 between M1 and M3 and the TE link 190 between M3 and M2.

At this time, if the TE link 170 of the middle layer 2 between M1 and M3 is not set in advance or the band required for setting is insufficient, the TE link 170 between M1 and M3 is again connected to the middle layer 2. Routing of the lower layer consisting of a TE link 150 for the middle layer between L1 and L4 and a TE link 160 for the middle layer between L4 and L3 in the lower server layer, which is a lower server layer (L1-). L4-L3). The TE link 170 between M1 and M3 thus provides a combination of M1-L1-L4-L3-M3 paths.

The paths 150 and 160 of the lower layer 1 to the lower server set up for the middle layer 2 are thus managed as TE links of the middle layer 2 where the upper client is located and selected in the process of establishing the transmission path of the middle layer. Can be.

The client LSP is a transport path 200 of the upper layer 3, for example, one of the PBB-TE transport paths, which is a kind of PTL (Packet Transport Layer), and a VPN for Ethernet. Service and the like. In this case, the transmission path 200 of the upper layer may be provided by selecting the TE link 260 between U1 and U2.

At this time, if the U-layer TE link 260 between U1 and U2 is not set in advance or the band required for TE link setting is insufficient, the TE link between U1 and U2 is a lower server layer for the upper layer 3. It is provided through the middle layer path setting from M1 to M2 consisting of the TE link 230 between M1 and M3 of the middle layer 2 and the TE link 250 between M3 and M2.

That is, the paths reset for U1 and U2 may be replaced through paths connected in the order of M1, M3, and M2.

The intermediate layer paths 230 and 250 by the lower server configured as described above may be managed as the TE link of the upper layer 3 to which the upper client belongs and may be selected in the process of setting the transmission path of the upper layer 3. That is, in the multi-layer transport network, LSPs generated by the general multi-protocol label switching (GMPLS) signaling protocol have LSPs 140, 150, and 200 for purely user services.

Here, among the LSPs for the user service, the LSP 140 of the lower layer 1 is a path between resources of the lower layer 1, L1 and L4 (110), L4 and L3 (120), and L3 and L2 (130). The LSP for is established through the TE link, and the LSP 150 of the middle layer 2 has an LSP corresponding to the inter-resource paths of the middle layer 2, M1 and M3 170, and M3 and M2 190. The LSP 200 of the upper layer 3 is configured through the TE link, and the LSPs corresponding to U1 and U2 260 are set through the TE link. The FA-LSP 170 of M1 and M3 of the middle layer 2 formed through the LSP 150 of L1 and L4 and the LSP 160 of L4 and L3, which are transmission paths set in an arbitrary section of the lower layer 1, respectively. ),

FA-LSP 190 of M3 and M2 formed by LSP 180 between L3 and L2 of lower layer 1, MSP and M3 formed of LSP 210 of L1 and L4 and LSP 220 of L4 and L3. U-formed by FA-LSP 230, M3 formed by LSP 240 of L3 and L2, FA-LSP 250 of M2, and LSP 230 of M1 and M3, and LSP 250 of M3 and M2 There is a FA-LSP 260 of U2.

3 is a diagram illustrating a structure of a transport layer.

In addition to switching for packets, GMPLS also supports timeslots, wavelengths, physical ports, and optical switching in one LSP. In this GMPLS, the transport layer may be classified based on fiber, lambda, PTL path, and packet as shown in FIG.

The fiber transmission path can provide leased line service in the unit of fiber (50). Fiber-based Fiber Switch Capability (FSC) delivers data based on the location of the physical space. In addition, Lambda transmission path can provide leased line service in units of Lambda (51, 52), and Lambda-based Lambda Switch Capability (LSC) delivers data based on wavelength.

One fiber 50 accommodates a plurality of Lambda 51, 52, one Lambda in turn receives a plurality of Packet Transport Layer (PTL) paths 53, and one PTL path in turn receives a plurality of packet flows. (54) can be accommodated. Packet flows are divided into service flows such as VoIP flow 54-1, IPTV flow 54-2, and Internet flow 54-3.

4 shows an operational flow of the GMPLS protocol for a single layer.

Referring to FIG. 4, the GMPLS protocol is largely composed of a signaling unit, a routing unit, and a link management protocol unit (LMP).

In this case, as shown in FIG. 4A, each node includes an optical resource manager 60, a packet transfer manager 70, and a main controller 80.

Since the node on the GMPLS performs data processing using the protocol as described above, the upper layer, the middle layer, and the lower layer have a signaling unit, a routing unit, and an LMP unit for each layer.

The optical resource management unit 60 manages resources and paths including routing and LMP units, and the packet transmission management unit 70 processes signaling and data transmission / reception with other nodes, including a signaling unit. The overall operation of the main controller 80 node is controlled.

Referring to FIG. 4B, a network operating the GMPLS protocol manages network resources for establishing a path through a TE link.

For example, resources between node 1 and node 2 are managed by the TE link (270). ID check, link property check, and connectivity check between two nodes are performed through the LMP unit. The data link determined to be used as the TE link for the path is transmitted to the routing unit and used as the TEDB (Traffic Engineering Database) information to be used when selecting the path (281, 282).

When the route request is received from the client (290), the signaling unit (Signaling) is a resource available to set the route from the origination to the destination requested by using the network routing information, TEDB information collected by the routing unit (Routing) In operation 300, it is determined whether a routing path exists.

If the path exists, i.e., if the path can be formed by selecting the existing TE links, the LSP path from origination to destination is established using a signaling protocol such as RSVP-TE (310).

When the path setting is completed, the completed result is transmitted to the client who requested the path in response to the request (320), and the path setting procedure is terminated.

FIG. 5 shows an operation flowchart of the GMPLS protocol requiring a layer call to multiple layers.

Referring to FIG. 5, when a path setting request is received from a user of the middle layer 2 and M to the node 1 node 330, the signaling unit of the middle layer is connected to a routing unit of the middle layer. The constructed middle layer network routing information, TEDB information is used to check whether resources for establishing a route from the originating to the destination requested by the user are available, and whether a routing path exists.

If the path does not exist (340), the inter-layer call requesting the lower layer 1, which is the lower server layer, to set the FA-LSP for the path setting of the middle layer 2 with respect to the middle layer 2; (Inter-layer call) request setting (350). In this case, an inter-layer call flag indicating an inter-layer call request is set in the path setting request.

The signaling unit of the lower layer 1 receiving the route request from the upper client layer determines whether a resource for establishing a lower layer path capable of processing a client request is available, and whether a routing path exists. In operation 360, the UE searches for and determines the lower layer routing information or the TEDB constructed by the lower layer routing unit.

If the path exists, the path of the lower layer is set using a signaling protocol such as RSVOP-TE or CR-LDP (371, 372). Since node 1 and node 2 have a path through node 3 between the lower layers 2 and L, the signaling unit of L1 sets the path of the lower layer to L3 (371), and L3 is the path of the lower layer to L2. Set 372.

In this case, an inter-layer call flag must be set in the signaling message initiated by the inter-layer call request. That is, since routing of nodes 1, 3, and lower layers 1, L of node 2 is performed by an inter-layer call request from the signaling processor of M1 to the signaling processor of L1, a signaling message between L1, L3, L3, and L2 is performed. Also includes an inter-layer call flag.

After the call setup is completed, the signaling unit of L1 confirms that the set LSP is a FA-LSP established by a call request between layers, and the LMP unit of the middle layer (2) (M) M1, which is an upper client layer. Registers the creation of the new TE link with the client (381).

At the same time, the signaling part of the called party L2 also checks and processes the inter-layer call flag included in the signaling protocol of the lower layer, so that the corresponding route request is requested between the layers. It can be assured that the FA-LSP is set by the A, and after the path setting is completed, the contents of the creation of the new TE link are automatically registered in the LMP part of the M2 of the upper middle layer without the operator's intervention (382).

After the newly generated FA-LSP is registered as a TE link to each of the LMP units included in the upper middle layer 2, M1 and M2 (381, 382), the LMP units of the middle layer (2, M1, M2) Performs a link management function for the corresponding TE link (390), and reports the resulting TE link information to the routing unit (Routing) of the middle layer (M1, M2), respectively, routing information or TEDB information of the middle layer. (401, 402).

The signaling unit (Signaling) of the lower layer (L1) having completed the inter-layer call request reports the result to the signaling unit (Signaling) of the middle layer (M1), which is the upper client layer (410).

Signaling unit (Signaling) of the middle layer (M1) again using the routing information or TEDB information of the routing section (Routing) of the middle layer (M1) whether the resources for the path setting of the middle layer (M1) is available, routing paths Check if 420 exists (420).

If the path is available, after completing the path setting of the middle layer using a signaling protocol such as RSVP-TE (430), the result is notified to the client requesting the first middle layer path setting (440).

6 shows an operation flowchart of the GMPLS protocol in which inter-layer calls are not required in multiple layers.

Referring to FIG. 6, the TE link of the FA-LSP established through the inter-layer call request process described in FIG. 5 is continuously managed by the LMP unit of the middle layer 2, M1, and M2 (450). The state is managed by Routing of. (451,452).

When receiving a route request from the client of the middle layer (460), the signaling unit of the middle layer M1 uses the middle layer network routing information or the TEDB information established by the middle layer M1 routing unit. In step 470, it is checked whether resources for establishing a path from the requested origination to the destination are available, and whether a routing path exists.

If a path exists under the premise that the TE link of the FA-LSP established through the inter-layer call request process of FIG. 5 is available, the node 1 (node 1) to node 2 (using a signaling protocol such as RSVP-TE) are used. After completing the path setting of the intermediate layer to node2 (480), the result is notified to the user who requested the path setting (490).

7 is a call setup flow diagram for processing an inter-layer call.

 When receiving a signaling message for requesting path establishment (S510), the signaling unit checks whether inter-layer call flag information in the signaling message is included (S520).

If the inter-layer call request flag is not included, that is, if the call is requested from the client rather than the route request by the inter-layer call request (S530), the signaling unit searches for the routing path from the requested origination to the destination, and the resource is Whether it is available is searched from the routing information or the TEDB (S600).

If the path exists and resources are available (S610), the signaling unit continues to perform the path setting process for the layer through signaling (S620), and reflects the changed band information through the path setting to the used TE link ( S630), and returns the result to the requesting party (S640).

If the routing path search from the origination to the destination fails or resources for establishing a route are not available (S610), the signaling unit checks the lower layer section corresponding to the required resource (S650), and inter-layer call request flag (Inter -layer call flag) information is requested to set the path to the lower layer (S660).

In response to the inter-layer call establishment request, when the contents of the creation of a new TE link are registered from the lower layer to the LMP unit and a result of the inter-layer call request is received, the LMP unit performs a link management function for the corresponding TE link. As a result, the confirmed TE link information is reported to the routing unit so that it can be reflected in the routing information or the TEDB information of the middle layer.

The signaling unit checks whether resources for setting a path of the middle layer M1 are available or a routing path exists using the routing information or the TEDB information of the routing unit. After the routing of the layer is completed, the result is notified to the client who requested the routing.

On the other hand, if the received routing request is not a routing request of the client but is an inter-layer call setup request (S530), referring to the routing information and the TEDB, whether a routing path for the request exists and whether the resource is available or not. Search for (S540, S550).

If the routing path does not exist or resources are not available, the path setting request process of the next lower server layer is recursively set in order to set a path for obtaining necessary resources (S650).

When a routing path and available resources exist for a path request for which an inter-layer call flag is set, a path setting process with a call in a request section of a requesting layer is performed (S560).

Here, the path setting process includes inter-layer call flag information indicating that the corresponding path setting procedure is a path setting procedure by an inter-layer call request.

After the path setting is completed, the signaling unit (Signaling) of the lower layer registers the set FA-LSP as a TE link to the LMP unit of the upper layer (S570).

The LMP unit of the upper layer receives the corresponding FA-LSP information and other related information and performs link management and state management as a TE link for the upper layer (S580). The TE link verified by the LMP unit is constructed as routing information by the routing unit (Routing) (S590).

The signaling unit searches for a routing path from the requested origination to the destination, searches whether the resource is available from the routing information or the TEDB (S600), and according to the search result, the signaling unit performs a path setting process for the corresponding layer through a signaling protocol. The process continues (S620), reflects the changed band information through the path setting to the used TE link (S630), and returns the result to the request side (S640).

8 is a call release flow diagram for processing an inter-layer call.

When a signaling message for requesting path release is received (S700), a path release process is performed with respect to the path release request (S720). According to the path release request, the band allocated to the corresponding path is returned and the related information of the TE link set to the corresponding path is also modified (S730).

In addition, it is checked whether the corresponding path was the last path set in the TE link (S740). If there is a remaining path other than the last path (S750), the result is returned and terminated (S800).

When a release request is generated for the path from the upper layer to the middle layer, the FA-LSP path set in the middle layer is released.

If it was the last path of the corresponding TE link (S750), it is checked through the TE link information whether the TE link is a TE link dynamically generated by the FA-LSP (S760).

If the link is not dynamically generated by the FA-LSP, the result is returned and terminated (S800).

If the release target call is the last call of the TE link dynamically generated for the FA-LSP, the LMP unit deletes the corresponding TE link registration information from the LMP management table (S770). In addition, the routing unit Routing changes the routing information according to the deleted TE link (S780).

The signaling unit requests the release of the FA-LSP corresponding to the deleted TE link to the signaling unit of the lower server layer (S790).

At this time, if all paths in the corresponding layer are deleted, the signaling unit of the lower server layer deletes the FA-LSP of the corresponding path at the request of the upper server layer.

Each part that performs Signaling / Routing / LMP process of client layer above and each part that performs Signaling / Routing / LMP of lower server layer must be physically and implementationly separated It does not have to be, only logically expresses the differences in the processing layers.

According to the above procedure, in the multi-layer / multi-area transport network in which the GMPLS protocol is operated, in the inter-layer call processing procedure requiring the routing of the lower server layer as the data link resource required for the end-to-end routing configuration request of the upper client layer. A technical scheme may be provided for both LMP parts of the upper client layer to identify and receive the generated FA-LSP as a TE link to be managed as a resource for the upper client layer and to automate a process of using the routing information.

Therefore, by completing the GMPLS signaling, LMP and routing processes for each FA-LSP generated after the inter-layer call processing procedure is completed, efficient network resource management and transmission path management for multi-layer transmission resources can be performed. Present realistic solutions.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a diagram conceptually illustrating a configuration of a multi-layer network according to the present invention;

2 is a conceptual diagram for FA-LSP;

3 is a diagram illustrating a structure of a delivery layer of GMPLS,

4 is an operation flowchart of a GMPLS protocol for a single layer;

5 is an operation flowchart of a GMPLS protocol requiring a layer call to multiple layers;

6 is an operation flowchart of a GMPLS protocol in which inter-layer calls are not required in multiple layers;

7 is a call setup flow diagram for handling an inter-layer call;

8 is a call release flow diagram for processing an inter-layer call.

<Explanation of symbols on main parts of the drawings>

1, L: lower layer 2, M: middle layer

3, U: upper layer

Claims (10)

A plurality of nodes for processing and routing signals to at least one of the plurality of layers, including at least one processing function of packet switching processing, time division switching processing, and optical fiber switching processing; The node manages resource and packet transmission for each layer, manages a path of a lower server layer through a traffic engineering (TE) -link, and responds to a request for establishing a path through the TE link and searching for available access paths. Layered network to establish established transmission paths. The method of claim 1, The node includes an LMP unit that registers and continuously manages FA-LSP, which is an available access path of a lower server layer, as the TE link; A routing unit managing a state and a routing path of a database (TEDB) for the TE link; And And a signaling unit configured to search for a path and a resource using the TEDB and the routing path, and to set a transmission path according to a request of the client. The method of claim 2, The node is provided with the LMP unit, the routing unit and the signaling unit for all of the hierarchical layers, respectively. The method of claim 1, The node corresponds to whether the inter-layer call request flag is included in the routing request, whether the request is an inter-layer call establishment request received from a higher server layer or a request received from a client of the corresponding layer. Judge, Until the inter-layer call setup is completed, the inter layer call flag is included in all signaling messages for inter-layer call setup, The route including the inter-layer call request flag is automatically recognized as FA-LSP. At a node constituting the multi-layer network, if a route setting request is received to the first layer, searching for an available access path to the first layer in response to the request; Requesting an inter-layer call establishment to a second layer, which is a lower server layer of the first layer, when there is no available access path; Registering an FA-LSP, which is an available access path from the second layer, into the first layer; And Managing the FA-LSP as a TE link of the first layer, and setting a transmission path for the request using the TE link to respond to the request. The method of claim 5, In the inter-layer call establishment request step, the access path available in the second layer is searched for the end-to-end path of the first layer, and the searched path is set as the FA-LSP and registered as the first layer. Resource management method of network. The method of claim 6, If there is no access path available in the second layer, request a call between the lower layer servers of the second layer to establish a layer, And managing the FA-LSP of the lower server layer with respect to the second layer to the TE link of the second step. The method of claim 6, If the routing request received to the first layer is an inter-layer call setup from a third layer that is a higher server layer of the first layer, In the first layer, searching for an available access path with respect to the end-to-end path of the third layer, and registering the discovered path FA-LSP with the third layer. Way. The method of claim 6 or 8, When the received request includes an inter layer call flag, it is determined as an inter layer call setup request. Until the inter-layer call setup is completed, the inter-layer call request flag is included in all signaling messages used for the inter-layer call setup. The resource management method of a multi-layer network automatically recognizes the path information including the inter-layer call request flag as a FA-LSP. The method of claim 5, Upon receipt of a path release request, return an allocated band, adjust the band of the TE link for the path requested to be released, And deleting the registration information of the TE link by the FA-LSP and releasing the FA-LSP path with respect to the path by the FA-LSP.

Images