KR20050088622A - Cr-lsp path information control system in mpls network management system and method thereof - Google Patents

Abstract

The present invention relates to a technique for managing a Constraint based Routed-Label Switched Path (CR-LSP) through a database of a Multi Protocol Label Switching (MPLS) network management system.

To this end, the present invention is a CR-LSP management unit for managing the CR-LSP generated by the incoming LER configured in the MPLS network; A database in which the CR-LSP information is stored by the CR-LSP management unit; And a predetermined command transmitted from the CR-LSP management unit to the incoming LER, and transmits the command execution result transmitted from the incoming LER to the CR-LSP management unit, and sends an alert message transmitted from the incoming LER to the CR. -Characterized by having a management agent for transmitting to the LSP management unit.

Description

CR-LSP management system and method in the MPLS network management system {CR-LSP path information control system in MPLS network management system and method}

The present invention relates to a CR-LSP management system and a method thereof in an MPLS network management system, and more particularly, through a database of a multi-protocol label switching (MPLS) network management system, a CR-LSP (Constraint based Routed-Label Switched Path). It relates to a technique for managing.

As is known, MPLS is a technical standard standardized by the International Engineering Task Force (IETF), which replaces the existing network layer (Layer 3) packet transmission method with label switching to transmit Internet traffic more efficiently. Next generation Internet router construction technology. MPLS has a feature that can provide services regardless of lower and upper protocol layers. Packet forwarding in MPLS network is done by label exchange, and each node of MPLS network decides the next node to be transmitted by label value included in incoming packet, and exchanges label and transmits MPLS packet to next node. Do this.

MPLS transmits traffic through a Label Edge Router (LER) and a Label Switching Router (LSR). The LER is located at a boundary of a network and transmits traffic through interworking between existing network layer packets (IP packets) and MPLS packets. The LSR is located at the center of the network and transmits the packet in the MPLS method.

The label used in MPLS has a size of 20 bits and this value determines the next node to be delivered. The label is predetermined and distributed by the network's signaling protocol (LDP / CR-LDP).

In such MPLS, CR-LSP is an explicit path set to satisfy bandwidth, path information, etc. by label distribution of CR-LDP protocol.

As shown in FIG. 1, the network management system 10 is connected to the management agent 20 through a COBA interface, and through this, transfers configuration, connection, failure, and performance information to each other.

The CR-LSP management unit 12 of the network management system 10 transfers the setting / deletion / change command for the CR-LSP to the command processing unit 22 of the management agent 2 through the predefined COVA interface as top-down. By allowing the operator to control the network, the physical configuration of the MPLS network and the logical connection information of the CR-LSP are stored in its own database 14 to limit unnecessary operations with the management agent 20 when inquiring.

When the management agent 20 receives an operation command from the network management system 10, the management agent 20 executes the operation on the related device.

In the configuration as shown in FIG. 1, when the network management system operator wants to generate the CR-LSP, the CR-LSP setting command is issued only for the ingress LER (Label Edge Router) 30. By the above instruction, the incoming LER 30 sets up the CR-LSP up to the egress LER via predetermined Label Switched Routers (LSR) via a signaling protocol (CR-LDP).

Since the CR-LSP is configured using the signaling protocol, the operator does not need to check or determine the availability of network resources. If there is a desired route, the node is designated by ER-HOP (Explicit Routing-HOP). You can intervene to some extent.

In addition, the operator can specify whether to switch or reset when a CR-LSP is set. In addition, the operator can select a CR-LSP to be transferred as a sub-path or specify a path to be reset.

In this way, since the setting state of the CR-LSP can be changed dynamically, the logical connection information of the CR-LDP stored in the database of the MPLS network management system often does not match the actual condition. Even when the LSP is set / deleted or failure alarm is lost, the network management system does not detect the transfer / reset / recovery of the CR-LSP, which is the main cause of information mismatch.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems,

The present invention MPR network management to efficiently manage the network by matching the path of the actual CR-LSP and the path stored in the database by presently updating the CR-LSP path information to be managed through the database of the MPLS network management system The purpose of the system is to provide a CR-LSP management system and its method.

In the MPLS network management system according to the present invention for realizing the above object, the CR-LSP management system, CR-LSP management unit for managing the CR-LSP generated by the incoming LER configured in the MPLS network; A database in which the CR-LSP information is stored by the CR-LSP management unit; And a predetermined command transmitted from the CR-LSP management unit to the incoming LER, and transmits the command execution result transmitted from the incoming LER to the CR-LSP management unit, and sends an alert message transmitted from the incoming LER to the CR. -Characterized by having a management agent for transmitting to the LSP management unit.

In the MPLS network management system according to the present invention for realizing the above object, the CR-LSP management method, when a specific CR-LSP setting is requested from the outside, the CR-LSP management unit sends the CR-LSP setting request message to the incoming LER A first process of delivering; A second step of the incoming LER setting the CR-LSP using a signaling protocol and then notifying the CR-LSP management unit of completion of the CR-LSP setting; A third step of the CR-LSP searching for a path to the CR-LSP; And a fourth process of storing the route search result in the database as the CR-LSP setting result.

In addition, in the MPLS network management system according to the present invention, the CR-LSP management method, when an alarm message is transmitted for a specific CR-LSP from the incoming LER, if the alarm message is a failure message, if the alarm message, the database in the database Changing the operation state of the CR-LSP to 'disable', and outputting an important alarm message to an operator if the CR-LSP is a negative path; A second step of changing the operation state of the CR-LSP to 'enable' in the database and linking the FEC of the main path CR-LSP to the CR-LSP if the alarm message is a transfer message; A third step of searching for a path to the CR-LSP and storing the changed CR-LSP information in the database if the alarm message is a set message; A fourth step of changing the operation state of the CR-LSP to 'enable' in the database and releasing the FEC link to the subpath CR-LSP if the alarm message is a recovery message; And a fifth process of deleting all information of the CR-LSP from the database if the alarm message is a termination message.

In addition, the CR-LSP management method in the MPLS network management system according to the present invention, when a specific CR-LSP release request from the outside, the CR-LSP management unit transfers the CR-LSP release request message to the incoming LER ; A second process of notifying the CR-LSP release completion to the CR-LSP management unit after the incoming LER releases the CR-LSP; And a third process of deleting, by the CR-LSP management unit, all information on the CR-LSP from the database.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail.

2 is a schematic diagram of a management information model managed by an MPLS network management system when a CR-LSP is generated.

As shown in FIG. 2, a physical link exists between adjacent LERs and LSRs or between LSRs and LSRs, a port exists at an end of the physical link, and an interface 30b, 34a, 34b, 36a having an IP address. , 36b, 40a). In the MPLS network management system of the present invention, two adjacent interfaces of adjacent nodes are managed in the form of logical links called MPLS links 50, 52,.

By doing so, there is no need to separately set the signaling link existing between the two interfaces, and it is possible to simplify management by unifying the settings such as parameters that exist only in one side or affect the signaling of both sides.

The CR-LSP 60 is composed of a set of connections 30c, 34c, 36c, ..., 40c as the LERs 30, 40 and the plurality of LSRs 34, 36, ..., respectively, and a cross connection 30c. , 34c, 36c, ..., 40c may be represented by two segments (input segment, output segment). Segment objects are represented by interface and label values, and are classified into input and output segments by direction.

The CR-LSP 60 has a CR-LSP name, which is composed of a router ID and a unique index value and is used as a key that can be distinguished from other CR-LSPs in the network. It is managed based on the LSP name, and the search key is the CR-LSP name when the search key is fault / transfer / set / delete / recovery.

On the other hand, the FEC (Forwarding Equivalency Class) 70 is a set of IP addresses that become a criterion for deciding which CR-LSP the IP packet should go through when the IP packet comes in. The FEC and CR-LSP Because they are pointing to each other, IP packets and CR-LSP can be mapped. Therefore, if you want to send a packet to a specific IP address to the CR-LSP, add the IP address to the FEC provided by the CR-LSP.

In addition, the CR-LSP includes information on the CR-LSP subpath 80 to be transferred to the attribute value of the secondary path. The primary path and the secondary path can be mapped to 1: 1 or N: 1, and the present invention is designed to support the N: 1 relationship.

In addition, the CR-LSP alarm message implemented by CORBA transmits a CR-LSP failure message to the MPLS network management system at the incoming LER when a failure occurs in a predetermined portion of the intermediate path via the CR-LSP. In addition, when a transfer is reset, when it is reset, an alarm is generated when a new CR-LSP is set from the network operator and when it is terminated.

All the information described with reference to FIG. 2 is stored in the database 14 of the network management system 10 as the information of the CR-LSP.

When the CR-LSP management unit 12 receives a CR-LSP setting request from the operator, the CR-LSP manager 12 transmits a setting request to the incoming LER 20. You can specify ER-HOP when setting CR-LSP. In this case, select a node that needs to go through without specifying any port of any node. If the path is specified in this way, even if the CR-LSP setup is successful, a separate path search is required to store specific CR-LSP path information in the database 14 of the MPLS network management system 10. I need work. In addition, there is a parameter that can be specified when setting CR-LSP. It is called recoveryFlag.This means that when a failure occurs during operation, it switches over to the sub-path where CR-LSP is assigned in advance (protect mode), or changes and resets the existing CR-LSP (reroute). mode). When switching, traffic is switched to another CR-LSP that is set in advance, so no route search is required, but if it is reset, the route search is required because the operator cannot know which path has been reset.

The operation of the present invention described above will be described in detail with reference to the flowchart shown in FIG.

3 is a flowchart illustrating a CR-LSP management method in the MPLS network management system according to an embodiment of the present invention.

When the CR-LSP management unit 12 of the MPLS network management system 10 is requested to generate a CR-LSP from the outside (S2), the CR-LSP management unit 20 receives the CR- to the incoming LER 30 through the command input unit 22 of the management agent 20. Delivering the LSP generation request (S4).

Accordingly, the incoming LER 30 sets the CR-LSP reaching the withdrawal LER 40 using the signaling protocol (S6), and notifies the command processing unit 22 of the management agent 20 that the CR-LSP setting is completed. (S8). The CR-LSP setting completion notification message includes the set CR-LSP name.

The CR-LSP management unit 12 of the network management system 10 notified of the completion of the CR-LSP setting through the command processing unit 22 of the management agent 20 performs a path search through the procedure as shown in FIG. 4 (S10). ), The route search result (CR-LSP generation result) is stored in the database 14 (S20).

Next, the path search procedure corresponding to S10 of FIG. 3 will be described in detail with reference to the flowchart shown in FIG. 4.

When the CR-LSP management unit 12 passes the queryXC command with the CR-LSP name as the key through the command processing unit 30 to the incoming LER 30 (S11), the incoming LER 30 cross-connects the output segment only. The information is transmitted to the CR-LSP management unit 12 (S12). The object name of the output segment consists of (node ID + IP address of the interface + label value).

 Since the network management system manages the nodes and the MPLS link between the nodes as one object, the CR-LSP management unit 12 extracts the nodes and interfaces of the output segments included in the cross connection, Through the MPLS link information, it is possible to extract a node and an interface of a power station linked with the interface of the node (S14).

Substituting the label value included in the output segment name in the IP address of the extracted node and interface, the input segment object name of the second node is generated, and then queryXC with the object name of the input segment (S15). In operation S16, cross connection information including an input segment and an output segment is received from the node.

Subsequently, it is determined whether the power node is an outgoing LER through the received cross connection information (S17), and if the power node is not the outgoing LER (S17 to N), the process proceeds to S14 to repeatedly perform the above-described S14 to S16, and withdraws. The cross connection to the LER 40 is queried to retrieve the CR-LSP reaching the withdrawal LER 40 via the LSRs at the incoming LER 30. In S17, if only the input segment is included in the received cross connection information, it is determined that the player node is the drawing LER.

Hereinafter, the CR-LSP management method when an alarm is applied to the present invention will be described in detail with reference to the flowcharts illustrated in FIGS. 5 to 8.

When an alarm message is transmitted to the CR-LSP management unit 12 through the alarm processing unit 20 of the management agent 20 and an alarm processing is requested (S22), the CR-LSP 12 analyzes the alarm message to determine the type of alarm. Check (S24).

According to the test result, if the alarm message is an error message, the error processing procedure to be described through FIG. 6 is performed; if the alarm message is a setting message, the setting procedure to be described through FIG. 7 is performed; and if the alarm message is a switching message, A transfer processing procedure to be described through FIG. 8 is performed, and if the alarm message is a cancellation message, a cancellation processing procedure to be described through S62 of FIG. 5 is performed, and if the alarm message is a recovery message, it will be described through S70 to S80 of FIG. 5. A recovery process is performed.

First, the recovery processing procedure will be described with reference to FIG.

As a result of the check in S24, if the alarm message is a recovery message (Yes in S60), the CR-LSP 12 changes the operation state of the corresponding CR-LSP to 'enable' in the database 14, and then recovers the recovered CR-LSP. The secondary path of the (S72).

As a result of the inspection, if the sub path is designated as the sub path of another CR-LSP (Yes in S74), the operation state of the sub path is changed to 'enable' state (S76), and the sub path of the other CR-LSP is different. If it is not designated as a path (No at S74), the operation state of the subpath is changed to 'disable' (S78), and then the packet is transmitted through the recovered CR-LSP by releasing the FEC linked to the subpath. (S80).

On the other hand, if the result of the check in S24, the alarm message is a failure alarm message (Yes in S30 of FIG. 5), as shown in Figure 6, the CR-LSP management unit 12 is the operation state of the corresponding CR-LSP in the database 14 After changing to 'disable', it is checked whether the CR-LSP is the main path (S32).

As a result of the check, if the CR-LSP is a negative path (No in S32), since a failure occurs in both the main path and the negative path, it is determined that this is a serious failure, and a path of important grade is transmitted to the operator of the network management system (S33). .

Unlike the case described above, when the path is set in the incoming LER 30 and the alarm message accordingly is transmitted to the CR-LSP management unit 12 through the alarm processing unit 24 of the management agent 20, the S24 of FIG. As a result of the test, the alarm message is determined to be a setting message (Yes in S40).

Subsequently, as shown in FIG. 7, the CR-LSP manager 12 determines whether the CR-LSP exists in the database 14 using the CR-LSP name as a key (S41), and the determination result database 14. If the CR-LSP is present (Yes in S41), the CR-LSP information, that is, cross connection information, input segment information, and output segment information, are deleted from the database 14 (S42). After the route search is performed through the procedure described (S43), new CR-LSP information corresponding to the route search result is inserted into the database 14 (S44).

However, if it is determined in S41 that the CR-LSP does not exist in the database 14 (No in S41), the process proceeds to S43 and the new CR-LSP information corresponding to the route search result is stored in the database ( 14).

On the other hand, after a failure occurs in the CR-LSP corresponding to the main path in the inlet LER 30 and a failure message is transmitted to the CR-LSP management unit 12 and the procedure as shown in FIG. 6 is performed, the inlet LER 30 is performed. When the CR-LSP is transferred to the CR-LSP corresponding to the subpath, when the transfer message for the subpath CR-LSP is transferred to the CR-LSP manager 12 through the alarm processing unit 24 of the manager 20. The CR-LSP management unit 12 performs the switching procedure as shown in FIG. 8.

That is, the operation state of the subpath CR-LSP is changed to 'enable' in the database 14 (S51), and the FEC of the main path CR-LSP is linked to the subpath CR-LSP, and the main path CR-LSP is connected. The forwarded packet may be transmitted through the subpath CR-LSP (S53).

In addition, when a specific CR-LSP is terminated in the incoming LER 30 and the cancellation message transmitted from the incoming LER 30 is delivered to the CR-LSP management unit 12 through the path processing unit 20 of the management agent 20, The CR-LSP manager 12 deletes all information stored under the CR-LSP name from the database according to the determination result No in S60 of FIG. 5 (S62).

As described above, the network management system stores the change information of the CR-LSP corresponding to the alarm message transmitted from the incoming LER 30 in real time in the database 14 through the procedure as shown in FIGS. 5 to 8. The operator of (10) can quickly and accurately check the information of the CR-LSP through an inquiry of the database 14.

In addition, the present invention may terminate the specific CR-LSP by the operator request of the network management system 10, when receiving the request for the termination of the specific CR-LSP (S90), CR-LSP management unit 12 is the management agent The CR-LSP release request message is transmitted to the incoming LER 30 through the command processing unit 22 of step 20 (S92).

Accordingly, the incoming LER 30 terminates the CR-LSP (S94) and notifies the CR-LSP management unit 12 of the completion of the termination of the CR-LSP through the command processing unit 22 of the management agent 20. (S96).

The CR-LSP management unit 12 notified of the completion of the termination of the CR-LSP deletes all information on the CR-LSP from the database 14 to terminate the above-described termination procedure of the CR-LSP (S98).

In the present invention, CR-LSP generation procedure (FIG. 3), CR-LSP alarm message processing procedure (FIG. 5 to FIG. 8), and CR-LSP cancellation procedure (FIG. 9) have been described separately, but CR-LSP management unit ( 12) is implemented in CORBA, so it runs in multi-thread depending on what operation is requested.

According to the present invention as described above, by transmitting accurate resource information on the current CR-LSP of the MPLS network through the network management system, there is an effect that can support the efficient operation management of the operator.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

1 is a block diagram of a CR-LSP management system in the MPLS network management system according to an embodiment of the present invention.

Figure 2 is a schematic diagram of the management information model of the CR-LSP applied to the present invention.

3 is a flowchart illustrating a CR-LSP generation procedure applied to the CR-LSP management method in the MPLS network management system according to an embodiment of the present invention.

4 is a flowchart illustrating a path search procedure applied to the CR-LSP management method in the MPLS network management system according to an embodiment of the present invention.

5 to 8 are flowcharts for explaining an alarm processing procedure applied to the CR-LSP management method in the MPLS network management system according to an embodiment of the present invention.

9 is a flowchart illustrating a CR-LSP cancellation procedure applied to the CR-LSP management method in the MPLS network management system according to an embodiment of the present invention.

Claims (27)

A CR-LSP management unit for managing a CR-LSP generated by an incoming LER configured in the MPLS network; A database in which the CR-LSP information is stored by the CR-LSP management unit; And The predetermined command transmitted from the CR-LSP management unit is transmitted to the incoming LER, the command execution result transmitted from the incoming LER is transmitted to the CR-LSP management unit, and the alert message transmitted from the incoming LER is transmitted to the CR-. CR-LSP management system in the MPLS network management system comprising a management agent to transmit to the LSP management unit. The method of claim 1, wherein the CR-LSP management unit CR-LSP management system in the MPLS network management system, characterized in that for managing the CR-LSP generated through the CR-LSP management model. The method of claim 2, wherein the CR-LSP management model is The interface of each output segment and the interface of each input segment between LER and LSR or between LSR and LSR is connected by a logical link, and the cross connection of each LER and each LSR is composed of an input segment and an output segment, and the CR-LSP is The CR-LSP management system of the MPLS network management system, characterized in that the cross-connection is composed of a set, the sub-path CR-LSP and FEC is registered to the CR-LSP. The method of claim 3, wherein the CR-LSP is CR-LSP management system in the MPLS network management system characterized by having a name consisting of a router ID and a unique index value. 4. The method of claim 3, wherein each segment is CR-LSP management system in the MPLS network management system, characterized in that it has a name consisting of the node ID of the LER or LSR, the ID of the interface, and the label value. 4. The method of claim 3, wherein each segment is CR-LSP management system in the MPLS network management system, characterized in that divided into input segments and output segments according to the direction.  The method of claim 3, wherein The CR-LSP and the FEC point to each other so that an IP packet belonging to a set of IP addresses corresponding to the FEC is delivered to the CR-LSP. The method of claim 1, wherein the CR-LSP management unit Analyze the alarm message sent from the incoming LER to extract the CR-LSP information changed in the incoming LER, and store the extracted CR-LSP information in the database to reflect the CR-LSP change in the incoming LER to the database CR-LSP management system in the MPLS network management system characterized in that. The method of claim 7, wherein the CR-LSP management unit When a specific CR-LSP generation is requested from the operator, the CR-LSP generation command is transmitted to the incoming LER through the management agent, and when the completion of CR-LSP generation is notified from the incoming LER, the path to the CR-LSP is notified. The CR-LSP management system of the MPLS network management system, characterized in that for searching and storing the route search results as CR-LSP information in the database. The method of claim 7, wherein the CR-LSP management unit When a specific CR-LSP termination request is requested from the operator, a CR-LSP termination instruction is transmitted to the incoming LER through the management agent, and when the completion of the CR-LSP termination is notified from the incoming LER, the CR-LSP is transmitted from the database. CR-LSP management system in the MPLS network management system, characterized in that to delete all information for. The method of claim 9 or 10, wherein the database The CR-LSP management system of the MPLS network management system, characterized in that cross connection information, input segment information, output segment information, and logical link information are stored for each CR-LSP. The method of claim 8, wherein the incoming LER is In the MPLS network management system, the alarm message is implemented as a CORBA, so that when a predetermined failure occurs in an intermediate node via the CR-LSP, the alarm message can be detected and transmitted to the CR-LSP management unit. Management system. A first step of, if a specific CR-LSP setting is requested from the outside, a CR-LSP management unit forwarding the CR-LSP setting request message to an incoming LER; A second step of the incoming LER setting the CR-LSP using a signaling protocol and then notifying the CR-LSP management unit of completion of the CR-LSP setting; A third step of the CR-LSP searching for a path to the CR-LSP; And And a fourth process of storing the route search result in the database as the CR-LSP setting result. The method of claim 1, wherein the third process is Querying the incoming LER for a cross connection; A second step of extracting a power interface from the database using the output segment information when the output segment information is transmitted from the incoming LER in response to the cross connection question; Querying a cross connection with an LSR to which the power interface belongs; And When segment information is transmitted from the LSR in response to the cross connection question, it is determined using the segment information whether the node to which the segment information belongs is a drawer LER. And a fourth step of performing the second step and terminating if the withdrawal LER is performed. 15. The method of claim 14, wherein in the second step Extracting an interface for an output segment from the database, extracting a logical link connected to the interface, and extracting a power interface connected to the logical link; and managing a CR-LSP in the MPLS network management system. 15. The method of claim 14, wherein the third step is After generating the input segment object name of the power by substituting the label value included in the power node, the IP address of the interface, and the output segment name, and querying the cross connection with the input segment object name. CR-LSP Management Method in MPLS Network Management System. 15. The method of claim 14, wherein in the fourth step If the segment information exists only the input segment information, CR-LSP management method in the MPLS network management system, characterized in that the node to which the segment belongs to determine the output LER. When an alarm message is transmitted for a specific CR-LSP from an incoming LER, when the alarm message is analyzed and the alarm message is a failure message, the operation state of the CR-LSP is changed to 'disable' in the database, and the CR-LSP A first step of outputting an important alarm message to an operator if is a negative path; A second step of changing the operation state of the CR-LSP to 'enable' in the database and linking the FEC of the main path CR-LSP to the CR-LSP if the alarm message is a transfer message; A third step of searching for a path to the CR-LSP and storing the changed CR-LSP information in the database if the alarm message is a set message; A fourth step of changing the operation state of the CR-LSP to 'enable' in the database and releasing the FEC link to the subpath CR-LSP if the alarm message is a recovery message; And And a fifth process of deleting all the information of the CR-LSP from the database if the alarm message is a termination message. 19. The method of claim 18, wherein in the second process The CR-LSP management method in the MPLS network management system, characterized in that the sub-path CR-LSP. 19. The method of claim 18, wherein the third process is A first step of determining whether the CR-LSP exists in the database; If present, deleting the information of the CR-LSP and searching for a path for the CR-LSP and storing a path search result as information of the CR-LSP in a database; And And if there is no path, search for a path for the CR-LSP, and store a path search result as information of the CR-LSP in a database. The method of claim 20, wherein the route search procedure is A fourth step of querying the incoming LER for a cross connection; A fifth step of extracting a power interface from the database by using the output segment information when the output segment information is transmitted from the incoming LER in response to the cross connection question; A sixth step of querying a cross connection to an LSR to which the power interface belongs; And When segment information is transmitted from the LSR in response to the cross connection question, it is determined using the segment information whether the node to which the segment information belongs is a drawer LER. And a seventh step of performing the second step and terminating if the withdrawal LER is performed. The method of claim 21, wherein the sixth step is After generating the input segment object name of the power by substituting the label value included in the power node, the IP address of the interface, and the output segment name, and querying the cross connection with the input segment object name. CR-LSP Management Method in MPLS Network Management System. The method of claim 21, wherein in the fifth step Extracting an interface for an output segment from the database, extracting a logical link connected to the interface, and extracting a power interface connected to the logical link; and managing a CR-LSP in the MPLS network management system. The method of claim 23, wherein in the seventh step If the segment information exists only the input segment information, CR-LSP management method in the MPLS network management system, characterized in that the node to which the segment belongs to determine the output LER. 19. The method of claim 18, wherein the fourth process is A first step of changing an operation state of the CR-LSP to 'enable' in the database; A second step of examining a secondary path of a restored CR-LSP in the database; If the sub-path CR-LSP is designated as a sub-path of another CR-LSP, changing the sub-path CR-LSP to 'enable' and then releasing the FEC link of the main path; And If the sub-path CR-LSP is not designated as a sub-path of another CR-LSP, changing the sub-path CR-LSP to 'disable' and then disabling the FEC link of the main path is provided. CR-LSP management method in the MPLS network management system characterized in that. A first step of, when a specific CR-LSP release request is requested from the outside, a CR-LSP management unit forwarding the CR-LSP release request message to an incoming LER; A second process of notifying the CR-LSP release completion to the CR-LSP management unit after the incoming LER releases the CR-LSP; And And a third process of deleting, by the CR-LSP management unit, all information on the CR-LSP from a database. The method of claim 26, wherein the database The CR-LSP management system of the MPLS network management system, characterized in that cross connection information, input segment information, output segment information, and logical link information are stored for each CR-LSP.