KR100335375B1 - Management method of mib for subscriber link in public atm switch - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Subscriber Link Management Technology Field of ATM Switching System

2. The technical problem to be solved by the invention

To manage the management information base (MIB) where the management information of the link is stored to enable the link management function through the ILMI protocol in the ATM exchange.

3. Summary of Solution to Invention

After the switch is started, the present invention retrieves the status information of all the links to which the subscriber station is currently connected to configure the MIB 306 for the link per row. Initialization information for the configured MIB 306 is obtained from a database located at the ATM switch. It periodically accesses this database and reflects the change to the MIB 306 to dynamically reflect the state change at the ATM switch.

4. Important uses of the invention

Implementation of Link Management Function Using ILMI Protocol

Description

MANAGEMENT METHOD OF MIB FOR SUBSCRIBER LINK IN PUBLIC ATM SWITCH}

The present invention provides a method and a method for managing a management information base (Managment Information Base) for enabling subscriber link management using an Integrated Local Management Interface (ILMI) protocol in an asynchronous delivery mode (hereinafter referred to as 'ATM') exchange. A computer readable recording medium having recorded thereon a program for execution.

With the emergence of various communication networks and the heterogeneity of network components, the necessity of efficient network management functions has emerged. The ATM Forum has adopted the 'ILMI (Integrated Local Management Interface) Protocol' to provide minimum management functions for ATM users. Suggested. ILMI allows two ATM devices to exchange management information using a predetermined ATM Virtual Channel (VC) over a User-Network Interface (UN), enabling state and configuration management for the link between the two systems. To this end, ATM equipment such as an ATM switch or an ATM terminal must implement an IME (ILMI Management Entity) that supports the ILMI MIB.

In addition, ILMI provides not only simple link state management but also the ability to dynamically allocate ATM addresses for ATM terminals without direct manipulation by the operator, thereby implementing IME for ATM equipment such as ATM switches and ATM cards. Support for ILMI function is required, and support for link management function using ILMI is required.

Accordingly, the present invention efficiently manages a management information base (MIB) in which management information of a link is stored when one IME manages a plurality of links in order to enable a link management function through ILMI in an ATM switching system. It is an object of the present invention to provide a method that can be initialized and managed by a computer and a computer-readable recording medium that records a program for executing the method.

1 is a schematic structural diagram of an ATM exchanger to which the present invention is applied.

2 is a diagram illustrating a connection between a subsystem of an ATM switch and an external terminal.

3 is a functional block diagram of an IME;

4 is an initialization process flow chart of a MIB management method according to the present invention;

5 is a processing flowchart for matching with an exchange database in the MIB management method according to the present invention;

6 is a flowchart of a MIB search process;

* Explanation of symbols for main parts of the drawings

301: SNMP message processing unit 302: Link status management unit

304: MIB management unit 305: exchange database

307: user terminal

Management information base (MIB) management method according to the present invention in order to achieve the above object, is applied to the ATM switch, management information base (MIB) for the management of subscriber links using the Integrated Local Management Interface (ILMI) protocol A management method, comprising: a first step of configuring a MIB for a link supporting a subscriber using an ILMI protocol among links connected to a subscriber station interface module (IM), and maintaining consistency of the MIB configured in the first step And a third step of periodically retrieving the exchange database, and a third step of dynamically reconfiguring the MIB by reflecting the search result of the second step.

On the other hand, the present invention, a management information base (MIB) management device having a processor, the function of configuring a MIB for the link supporting the subscriber using the ILMI protocol of the link connected to the subscriber terminal interface module; Searching the exchange database periodically to maintain consistency of the configured MIBs; And a computer readable recording medium having recorded thereon a program for executing the function of dynamically reconfiguring the MIB by reflecting the search result.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a structural diagram of an ATM switch to which the present invention is applied.

As shown in the figure, the ATM switch to which the present invention is applied includes one ATM Central Switching Subsystem (ACS) 101 and a plurality of ATM Local Switching Subsystems (ALS) 102. The ACS 101 interconnects a plurality of ALS 102 and performs centralized system control, while the ALS 102 performs basic tangential and subscriber exchange functions. In the present invention, since the subscriber link to be managed is accommodated in each ALS 101 through the subscriber board (IM) 103, the ILMI IME block for carrying out the present invention includes a call connection control processor (CCCP) of the ALS 101; 104).

The controllers and processors that make up the ATM switch are interconnected through the ATM switch 105 and exchange messages with each other using an inter-processor communication (IPC) mechanism 107. In addition, reference numeral 106, which is not described in the drawing, is a processor (OMP) installed in the ACS 101 to perform operation and maintenance.

Fig. 2 shows an internal structure diagram of the ALS 205 (102 of Fig. 1) in which an IME block implementing the present invention is executed.

One ALS 205 may accommodate a plurality of subscriber boards IM 207 (103 in FIG. 1), and each subscriber board IM 207 may again accommodate one or more subscriber links 204. Therefore, the ILMI IME operated in one ALS manages a plurality of subscriber links.

A subscriber station (CPE) 206 connected via a subscriber link 204 can manage the state of each link by exchanging ILMI messages using a fixed VC (VPI = 0, VCI = 16). The IME 201 operated in the ALS 205 is executed in the CCCP 208 (104 of FIG. 104), which is the main processor of the ALS 205, and the SROS 202, which is a real time operating system, is operated in the CCCP 208. Therefore, the IME 201 to which the present invention is applied is executed as an application program on the SROS 202, and uses the IPC (107 of FIG. 1) provided by the SROS 202 for exchanging ILMI messages with the subscriber station.

The IPC message sent by the IME 201 is converted into an ATM cell in the AAL layer 203 of the CCCP 208 and delivered to the IM 207 to which the subscriber terminal 206 is connected. In addition, the ILMI message transmitted from the subscriber station 206 is delivered to the AAL layer 203 of the CCCP 208 by the switch internal switch (S / W) through the IM 207 in the form of an ATM cell. 203 converts this message into an IPC message and forwards it to IME 201.

3 is a software structural diagram of an IME block. The IME 201 of FIG. 2 manages a plurality of subscriber links housed in one ALS (205 of FIG. 2). The configuration of the IME (201 of FIG. 2) includes a management information base (MIB) 306 for storing information on all links to be managed by the IME (201 of FIG. 2), a MIB management unit 306 for managing the same, and a user terminal. 307 and an SNMP message processor 301 for transmitting and receiving ILMI messages in Simple Network Management Protocol (SNMP) format, and the current status of all subscriber links connected to the SNMP message processor 301 and the MIB manager 304. LINK state management unit 302 for managing the. The LINK state manager 302 manages connection information, configuration information, and address registration information of each link, and manages a separate storage 303 for this.

The MIB manager 304 pulls initial information for all subscriber links currently being managed from the exchange's database 305. In addition, the MIB management unit 304 repeatedly accesses the exchange database at a 30-second interval to maintain the consistency of the data of the exchange database 305 and the management information base (MIB) 306 managed by the IME. The value of (MIB) 306 is updated.

Referring now to Figures 4 to 6 in detail the management procedure of the management information base according to the present invention.

4 is a flowchart illustrating a process in which the MIB management unit 304 (FIG. 3) initializes the management information base (306 of FIG. 3) for a plurality of links.

When the IME (201 in FIG. 2) starts to be executed (401), first, a management information base (MIB) for a link managed by the MIB management unit (304 in FIG. 3) must be constructed. To this end, the MIB manager (304 of FIG. 3) constructs an initial data structure of the management information base (MIB), and then searches (403) information on the IM (207 of FIG. 2) to search for a link to be managed. As a result, the IM (207 in FIG. 2) and its type currently mounted in the ALS (205 in FIG. 2) are retrieved. When the search is finished (404), the number of links accommodated in the IM (207 in FIG. 2) is determined by the type of IM (207 in FIG. 2) that is retrieved, so that the MIB manager (304 in FIG. 3) is the IM (207 in FIG. 2). Link information is retrieved (405) from the exchange database (305 in FIG. 3) by this maximum number of acceptable links. In this search, the IME (201 of FIG. 2) first checks whether the user terminal connected to the link can support the ILMI function, extracts the initial state value of the link, and extracts the initial state value of the link connected to the terminal supporting the ILMI function. Store 406 in ILMI's MIB. This process is performed for all links of the ALS (205 in FIG. 2) (407).

FIG. 5 shows the information performed by the MIB management unit 304 (FIG. 3) in order to match the link information stored in the exchange database (305 in FIG. 3) with the value of the MIB (306 in FIG. 3) managed by the IME (201 in FIG. 2). A flow chart for the task.

After initially configuring the MIB (306 in FIG. 3) for the link, the MIB management unit (304 in FIG. 3) retrieves IM information stored in the exchange database (305 in FIG. 3) at intervals of 30 seconds. If a new IM has been added as a result of the search for the IM information, the MIB (306 of FIG. 3) for the new IM (207 in FIG. 2) is initialized and the configured MIB is removed if the existing IM (207 in FIG. 2) is removed. . In addition, the link information is retrieved 502, the newly retrieved value is compared with the value stored in the current MIB 503, and if there is a change in the value, the MIB value is immediately updated 504. This operation is performed for all MIBs (505), waits for the set 30 seconds (506) and returns.

Fig. 6 is a flowchart for the operation of retrieving the value of the current exchange MIB or changing the current value to a new value at the request of the IME (201 in Fig. 2).

Upon receiving a search request for the current MIB through the LINK state manager (302 in FIG. 3) (601), the MIB manager (304 in FIG. 3) checks whether the requested Object ID (OID) is a legitimate object ID. 602, the corresponding object is retrieved from the MIB (306 of FIG. 3), and the result is transmitted to the LINK state management unit (302 of FIG. 3). At this time, the MIB management unit 304 checks whether the object in the MIB indicated by the object ID (306 in FIG. 3) is an existing object, and whether or not the object can be read and written. As a result of the check, if the object ID is not valid, an error is processed and returned.

Then, the object search result of the MIB is delivered (604) and returned for all object IDs requested by the MIB (306 in FIG. 3).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

Accordingly, the MIB management method according to the present invention enables efficient management of the MIB in an ATM switching system environment where one ILMI functional block (IME) must manage a plurality of ILMI links simultaneously. According to the present invention, the MIB configured in the exchange is initialized and managed only for the link currently managed, and when a new IM is added or deleted, an entry of the MIB for the link is dynamically generated and removed. In addition to supporting efficient use, it also provides efficient search performance compared to configuring a MIB for all possible links.

Claims (5)

In the management information base (hereinafter referred to as 'MIB') management method applied to the ATM switch, for the management of the subscriber link using the Integrated Local Management Interface (ILMI) protocol, A first step of configuring a MIB for a link supporting a subscriber using an ILMI protocol among the links connected to a subscriber station interface module (hereinafter referred to as 'IM'); A second step of periodically searching the exchange database to maintain consistency of the MIB configured in the first step; And A third step of dynamically reconfiguring the MIB by reflecting the search result of the second step Management information base management method for subscriber link management comprising a. The method of claim 1, The first step, A fourth step of retrieving a currently mounted IM from the database of the exchange and retrieving the status of a link accommodated in each IM; And A fifth step of configuring a MIB for a link supporting a subscriber using an ILMI protocol among the IM currently mounted and a link connected to the IM from the result of the step; Management information base management method for subscriber link management comprising a. The method of claim 2, The search for the IM in the fourth step, Method for managing a management information base for subscriber link management, characterized in that the IM to search the type of IM to determine the number of acceptable links. The method of claim 1, The third step, A fourth step of initializing the MIB for the new IM if the new IM has been added and removing the corresponding MIB if the existing IM has been removed; A fifth step of comparing the retrieved value of the link information with the value of the link information stored in the MIB and updating it if there is a change Management information base management method for subscriber link management comprising a. In a management information base ('MIB) management device having a processor, Configuring a MIB for a link supporting a subscriber using the ILMI protocol among the links connected to the subscriber station interface module; Searching the exchange database periodically to maintain consistency of the configured MIBs; And A function of dynamically reconfiguring the MIB by reflecting the search result A computer-readable recording medium having recorded thereon a program for executing the program.