KR0169253B1 - Atm brm conserving method - Google Patents

Abstract

The present invention relates to a broadcast memory data holding method in a duplex operation of an asynchronous transfer mode exchanger, and more particularly, to a broadcast memory data holding method in an asynchronous transfer mode exchanger, in which a state bit string in a switch control timing board and a broadcast memory signal counter are used, A broadcast memory data holding method for duplicating an asynchronous transfer mode exchanger is disclosed so that data of a broadcast memory is held and can operate in an active mode on another board.

Description

How to Maintain Broadcast Memory Data When Redundant Operation of Asynchronous Transfer Mode Switch

FIG. 1 is a hardware configuration diagram of a duplicated asynchronous transfer mode switch to which the present invention is applied; FIG.

FIG. 2 is a block diagram showing a state bit string of a broadcast memory row and a switch control timing board of a switch memory board to which the present invention is applied; FIG.

FIGS. 3A to 3C are flowcharts for explaining a method of holding a broadcast memory data according to the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

11: SCTA: Switch Control and Timing Board Assembly

12: SWNC: Switch Network Controller

13: SMEA: Switch MEmory board Assembly

14: BRM: BRoadcasting Memory

15: LLIA: Local Link Interface board Assembly

16: CCCP: Call and Connection Control Processor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast memory (BRM) data retention method in a redundant operation of an asynchronous transfer mode (ATM) switch, and more particularly to a SWitch Network Controller ) And a BRM signal counter corresponding to the BRM column in the software and BRM data in a switch memory board (hereinafter referred to as " SMEA ") to a single printed circuit board (Hereinafter, referred to as " BRM data ") in a duplex operation of an ATM switch capable of retaining data of the BRM data.

In order to ensure continuity and stability of the ATM switch, all hardware is mounted in a redundant mode and operated in an active mode and a standby mode. When an active mode hardware fails, the standby mode hardware is put into the active mode and the existing active mode is changed to the standby mode. The hardware in the active mode performs its own function, but the hardware in the standby mode exists in a standby state without performing the function.

When a broadcasting function is performed in an ATM switch operating in the redundancy mode, the contents of the broadcast memory can not be maintained if the hardware operating in the active mode is broken or a malfunction occurs. Also, there is a disadvantage in that when the contents of the broadcast memory of the hardware operating in the active mode is transferred to the hardware operating in the standby mode, inconsistency of the broadcast memory occurs between the two hardware boards.

Accordingly, it is an object of the present invention to provide a method for maintaining BRM data constantly using a state bit string of the SWNC software and a BRM signal counter in order to prevent discrepancy of BRM data generated when an ATM switch is duplicated.

According to another aspect of the present invention, there is provided a method for maintaining broadcast memory data in a dual operation of an ATM switch, the method comprising: determining whether the switch network controller is initialized or restarted; The method comprising the steps of: initializing all of the memory data, restoring values of the status bit string and the broadcast memory signal counter when the switch network controller is restarted, and comparing broadcast memory information in the switch memory board operating in the active or standby mode Receiving address data and change data, and recording the same change data in a broadcast memory in a switch memory board operating in an active or standby mode.

According to another aspect of the present invention, there is provided a method for maintaining broadcast data in a dual operation of an ATM switch, the method comprising the steps of: determining whether the switch network controller is initialized or restarted; A step of restoring values of a status bit string and a broadcast memory signal counter when the switch network controller is restarted; monitoring insertion of a switch memory board and maintaining broadcast memory data; , Receiving address data and change data, and recording the same change data in a broadcast memory in a switch memory board operating in an active or standby mode.

According to another aspect of the present invention, there is provided a method for maintaining broadcast data in a dual operation of an ATM switch, the method comprising the steps of: determining whether the switch network controller is initialized or restarted; The method comprising the steps of: initializing all broadcast memory data; restoring values of the status bit string and the broadcast memory signal counter when the switch network controller is restarted; changing the active or standby mode hernal monitoring and broadcast memory signal counters; , Receiving address data and change data, and recording the same change data in a broadcast memory in a switch memory board operating in an active or standby mode.

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

FIG. 1 shows a hardware configuration diagram of a duplicated ATM switch to which the present invention is applied. The SCTA with SWNC software is redundantly mounted on the A and B axes, and the first operating axis becomes the active mode and operates in the active mode and the standby mode, respectively. SCTA and SWNC software operating in active mode control the entire hardware of the ATM switch, and SWNC software of SCTA in standby mode is operated in standby mode against the failure of SCTA in active mode. According to the routing information of the input cell, the SMEA that performs the routing of the actual cell is redundantly mounted on the A and B axes, so that the axis to be operated first becomes the active mode, and the active mode SMEA performs the cell routing function . The standby mode SMEA is operated in case of failure of the active mode SMEA. Broadcast memory, BRM, is present in all of the redundant SMEAs. 16 ports of the active mode and 16 ports of the standby mode are provided in the local link interface board assembly (LLIA), which is the input / output portion of the user cell.

The broadcast function of the ATM switch must be received by the SWNC software from the call and connection control processor (hereinafter referred to as CCCP), the broadcast signal setting signal, the address data, and the change data, and the SWNC software must change the received address data The BRM address is selected and the received change data is recorded in the BRM address. When a broadcast cell arrives, the BRM address is determined by the address data in this cell, the contents are read from this address, and the cell is copied and transmitted according to the read contents. The BRM having the broadcast data of the ATM switch is located in the SMEA and the BRM data is updated according to the control of the SWNC software in the switch control and timing board assembly (SCTA). The SCTA and the SMEA are mounted in redundancy, each operating in active mode and standby mode.

FIG. 2 shows a block diagram of a SMEA BRM column and a SCTA status bit stream to which the present invention is applied. SMEA's BRM is composed of 2-byte columns and is called BRM column. Each BRM column is initially set to '0', but when the broadcast function is set, it is recorded as a unique value other than '0'. SCTA's status bit sequence is a 1: 1 bit sequence corresponding to the BRM column. When all bits are initially set to '0', but the BRM column is in use as a value other than '0' And it is possible to know the use / nonuse of the corresponding BRM column by looking at the status bit string. In addition, the related BRM signal counter of the broadcasting function is provided in the SWNC software to increase the BRM signal counter when the broadcasting function is set, and to reduce the BRM signal counter when the broadcasting function is set.

3A and 3B are flowcharts for explaining a broadcast memory data retention method when redundant operation of an asynchronous transmission mode switch according to the present invention is performed. FIG.

From the start signal, step 301 identifies whether the SWNC of the SCTA has been started by an initial start-up in accordance with the hardware power supply of the ATM switch, or whether it has been restarted according to the active / standby mode hardware change of the SCTA. This distinction distinguishes between SMME's BRM and SCTA's BRM signal counter and state bit sequence. Since the ATM switch is initialized at the initial startup of the SCTA according to the power supply, the SWNC software of the SCTA initializes all of the BRA data of the SMEA operating as single or redundant to '0'. The contents of the status bit string of the signal counter are also initialized to '0'. In step 303, the SWNC software is retried according to the active / standby mode hardware change of the SCTA, and the state bit string of the SWNC software and the BRM signal counter value are restored using the BRM data of the SMEA in which the broadcast function is recorded . This reads the BRM value of the SMEA. If this value is not '0', it increases the BRM signal counter and changes the value of the corresponding status bit string to '1'. In this way, since the state bit string and the value of the BRM signal counter are restored and operated, the BRM data according to the broadcast function setting / release / change can be maintained. Step 304 is to allow the SWNC software to perform this task periodically as a method for maintaining BRM data in the case of an inconsistent BRM data in active / standby mode. This task, which is performed periodically by the SWNC software, compares the BRM information of the active mode SMEA with the BRM information of the standby mode SMEA. When a discrepancy occurs in this comparison process, the BRM information of the active mode SMEA is written over the BRM of the standby mode SMEA to induce data coincidence. If the BRM data in the active / standby mode match, the broadcast function can be accurately performed even if the standby mode SMEA is changed to the active mode SMEA. Step 305 is to receive a broadcast function setting / change / cancel signal from the CCCP, and receive address data and change data for determining the BRM address. Step 306 records the same change data to the BRMs of both sides of the SMEA since the SMEA is operated in redundancy in the active / standby mode and the address data and the change data received in step 305 are recorded in the SMEA active / This is to match the BRM data when switching.

FIG. 3b is a flowchart illustrating a method for maintaining broadcast memory data when the asynchronous transmission mode switch according to the present invention is operated in a duplex mode, wherein only one SMEA is installed and another SMEA is inserted during operation in the active mode, The BRM data can be maintained at a predetermined rate.

In step 311 with the start signal, it is discriminated whether the SWNC of the SCTA has been started by an initial start-up according to the hardware power supply of the ATM switch or whether it has been restarted according to the active / standby mode hardware change of the SCTA. This distinction distinguishes between SMME's BRM and SCTA's BRM signal counter and state bit sequence. Since the ATM switch is initialized at the initial start-up of the SCTA according to the power supply, the SWNC software of the SCTA initializes all BRM data of the SMEA operating as single or redundant to '0'. The contents of the status bit string of the signal counter are also initialized to '0'. In step 313, the SWNC software is retried according to the active / standby mode hardware change of the SCTA, and the state bit string of the SWNC software and the BRM signal counter value are restored by using the BRM data of the SMEA in which the broadcast function is recorded . This reads the BRM value of the SMEA. If this value is not '0', it increases the BRM signal counter and changes the value of the corresponding status bit string to '1'. In this way, since the state bit string and the value of the BRM signal counter are restored and operated, the BRM data according to the broadcast function setting / release / change can be maintained. In step 314, when only one SMEA is installed in the ATM switch and another SMEA is inserted while operating in the active mode, the SWNC software monitors the insertion of another SMEA to maintain the BRM data when the SMEA operates in the standby mode , And this operation is performed periodically so that a process of maintaining BRM data is performed upon insertion. This operation reads the BRM data of the active mode SMEA and records it in the BRM of the newly inserted standby mode SMEA. In this periodic method, when one SMEA is operated, another SMEA is inserted and the BRM data can be maintained even if it is operated in redundancy. Step 315 is a reception of a broadcast function setting / change / release signal from the CCCP, and reception of address data and change data for deciding the BRM address. Step 316 records the same change data to the BRMs on both sides of the SMEA since the SMEA is operated as redundancy in the active / standby mode, and the address data and the change data received in step 315 are recorded in the SMEA active / It is intended to match BRM data when switching.

FIG. 3C is a flow chart for explaining a broadcast memory data retention method when the asynchronous transmission mode switch according to the present invention is operated in redundancy. FIG. 3C is a flowchart illustrating a BRM data retention method according to all of the active / to be.

In step 321 with the start signal, it is discriminated whether the SWNC of the SCTA is started by the initial start-up in accordance with the hardware power supply of the ATM switch or whether it is restarted according to the active / standby mode hardware change of the SCTA. This distinction distinguishes between SMME's BRM and SCTA's BRM signal counter and state bit sequence. Step 322 initializes the ATM switch at the initial start-up of the SCTA according to the power supply, so that the SWNC software of the SCTA initializes all BRM data of SMEA operating as single or redundant to '0'. The contents of the status bit string of the signal counter are also initialized to '0'. In step 323, the SWNC software is retried according to the active / standby mode hardware change of the SCTA, and the state bit string of the SWNC software and the value of the BRM signal counter are restored using the BRM data of the SMEA in which the broadcast function is recorded . This reads the BRM value of the SMEA. If this value is not '0', it increases the BRM signal counter and changes the value of the corresponding status bit string to '1'. In this way, since the state bit string and the value of the BRM signal counter are restored and operated, the BRM data according to the broadcast function setting / release / change can be maintained. Step 324 shows a method of maintaining BRM data according to all hernias of SMEA in active / standby mode. If both SMEAs are full, both SMEA BRM data are lost. In this case, the BRM signal counter of the SWNC software that maintains the BRM usage rate is detected as '0' The data of the bit string is also set to '0' to match the data with BRM when SMEA is newly inserted. This operation is also performed periodically. Step 325 is a case where a broadcast function setting / change / release signal is received from the CCCP, and the address data and change data for determining the BRM address are processed in the same manner. Since the SMEA is operated as an active / standby redundancy in step 326, the address data and the change data received in step 325 are recorded in the BRMs of both sides of the SMEA, This is to match the BRM data when switching.

As described above, according to the present invention, there is an excellent effect of preventing discrepancy of BRM data generated when the ATM switch is duplicated using the status bit string of the SWNC software and the BRM signal counter, and keeping the BRM data constant.

Claims (10)

The method comprising the steps of: determining whether the switch network controller is initialized or restarted; initializing all of the broadcast memory data when the switch network controller is initialized; and if the switch network controller is in a restart state, The method comprising the steps of: recovering a value of a signal counter; checking and calibrating broadcast memory information in a switch memory board operating in an active or standby mode; receiving address data and change data; And storing the same change data in the broadcast memory in the switch memory board when the asynchronous transfer mode switch is operated. 2. The method of claim 1, wherein when the switch network controller is initialized, the switch network controller software initializes all the broadcast memory data of the switch memory board. The method of claim 1, wherein when the switch network controller is in a restart state, the state bit string of the switch network controller software and the value of the broadcast memory signal counter are restored using the broadcast memory of the switch memory board on which the broadcast function is recorded A method for maintaining broadcast memory data in a duplex operation of an asynchronous transfer mode switch. The method of claim 1, wherein the step of checking and calibrating broadcast memory information in a switch memory board operating in the active or standby mode comprises: broadcasting network information in a switch memory board operating periodically in an active or standby mode, Wherein the content of the standby mode is changed to the content of the broadcast memory of the active mode when the inconsistency occurs. The method as claimed in claim 1, wherein the step of receiving the address data and the change data comprises: receiving a broadcast function setup / change / release signal from the call connection control processor, address data for determining a broadcast memory address, And transmitting the asynchronous transfer mode switch to the broadcast memory. The method as claimed in claim 1, wherein the step of writing the same change data to the wandering memory operating in the active or standby mode of the switch memory board comprises the steps of storing address data and change data received from the call connection control processor in an active or standby mode And the broadcast memory is simultaneously recorded in the broadcast memory. The method comprising the steps of: determining whether the switch network controller is initialized or restarted; initializing all of the broadcast memory data when the switch network controller is initialized; and if the switch network controller is in a restart state, The method comprising the steps of: restoring a value of a signal counter; monitoring insertion of a switch memory board and maintaining broadcast memory data; receiving address data and change data; And recording the same change data in the memory when the asynchronous transfer mode switch is operated. The method as claimed in claim 7, wherein the step of monitoring insertion of the switch memory board and maintaining the broadcast memory data comprises: if only one switch memory board is mounted and the other switch memory board is inserted into the active mode, The switch network controller software monitors the insertion of another switch memory board and maintains the broadcast memory data when inserting the switch memory board. The broadcast memory data holding method in the dual operation of the asynchronous transfer switch The method comprising the steps of: determining whether the switch network controller is initialized or restarted; initializing all of the broadcast memory data when the switch network controller is initialized; and if the switch network controller is in a restart state, Changing a signal value of the signal counter; changing a hearing monitoring and broadcast memory signal counter of a switch memory board operating in an active or standby mode; receiving address data and change data; And recording the same change data in a broadcast memory operating in a stand-by mode. 10. The method of claim 9, wherein the step of monitoring the hernia and the broadcast memory signal counter of the switch memory board operating in the active or standby mode comprises periodically examining whether the active or standby mode switch memory board is fully healed, And the data of the broadcast memory signal counter and the status bit string of the switch network controller are initialized to match the data with the broadcast memory when the switch memory is newly inserted. The broadcast memory data holding method in the dual operation of the asynchronous transfer mode switch .