KR20030027351A - Method of duplication for the management port using the bus switching - Google Patents

Abstract

PURPOSE: A duplexing method of a management port using a bus switch is provided to duplex a CPU conveniently although using an identical MAC. CONSTITUTION: A bus switch(37) is used for controlling a duplex CPU in an exterior. An active CPU(10) and a standby CPU(20) use an identical MAC. A management device(30) includes the bus switch(37) which makes only active CPU(10) communicate with an external CPU control module(50). In addition, a plurality of converters(11,21,51) are provided. The bus switch(37) processes a packet of the active CPU(10) only and informs to the external CPU control module(50) through the converter. If data communication preparation is completed, the management device(30) checks the active CPU(10). A bus switching connection is executed in the active CPU(10). The connected CPU transmits/receives a module and a packet, and executes a communication. If an error is generated in the active CPU(10), the bus switch(37) of the management device(30) executes a switching for connecting the standby CPU(20) to the module. The newly activated CPU and module transmits/receives a packet, and executes a communication.

Description

Redundancy of management port using bus switch {METHOD OF DUPLICATION FOR THE MANAGEMENT PORT USING THE BUS SWITCHING}

The present invention relates to a method of duplication of a management port using a bus switch, and more particularly, to a method of duplication of a management port of a duplicated CPU.

Conventionally, two apparatuses are used for duplexing a management port of a duplicated CPU.

The first uses an Ethernet switch (ETHERNET SWITCH) and the second uses a hub (HUB).

A system using an Ethernet switch uses different MAC (), and a system using a hub can be simply implemented regardless of using the same MAC.

1 illustrates the CPU redundancy using an Ethernet switch. The active CPU is referred to as MAC A 10, and the standby CPU is referred to as MAC B 20.

The two MACs inform the management device 30 of the state of the CPU, and the Ethernet switch 31 in the management device 30 switches only the active CPU of the two MACs to communicate with the system block 40.

Since the MACs of the CPUs are different from each other, the system block 40 needs to know the state of the CPUs in advance in order to communicate only with the active MACs, so that the CPUs 10 and 20 monitor each other and manage the results. Notify (30).

If a problem occurs and MAC A, the active CPU, and MAC B, the standby CPU are switched, the management device 30 knows the transfer fact based on the information introduced from the CPU, and communicates with the MAC B.

At this time, the information between the two CPUs must be the same to communicate with the system block 40 even after the transfer.

FIG. 2 shows the redundancy of the CPU using the hub. The configuration thereof is the same as that of FIG. 1, and the hub 33 switches only in the management device 30.

Since the MACs of the CPUs are the same, the management device 30 always communicates only with MAC A. Therefore, in the system block 40, it is not necessary to know which CPU is active or standby.

However, the method of using the Ethernet switch, because it uses a different MAC may cause problems in management. For example, if the MAC of the currently active CPU is A and the MAC of the standby CPU is B, since MAC A is active on the management device 30 side, information may be exchanged with MAC A. When a case arises, the activity is put on standby, and the management device must detect that MAC B is active quickly and communicate only with MAC B.

In the above case, if there is a risk that the management device may be misunderstood due to different MACs, and a monitoring function that automatically detects a change of MAC on the management device side should be added when data is input from the outside, the system is implemented. There is a problem of this complexity.

In addition, in the method of using a hub, there is no problem when transmitting a packet to the CPU, but when the amplification and the standby CPU try to transmit the packet to each other, not only the packets of the same MAC are transmitted but also the packets of the standby CPU are blocked. You need a way to do it.

In addition, since the hub is less integrated than when using an Ethernet switch, there is a problem in that the implementation of the circuit is expensive.

The present invention has been made to solve the above problems, the object of the present invention is to provide a CPU redundancy method that is easy to operate while using the same MAC.

1 and 2 are schematic diagrams showing the prior art.

3 is a block diagram showing an overview of the present invention.

FIG. 4 is an embodiment in which FIG. 3 is actually implemented.

* Description of the symbols for the main parts of the drawings *

10: active CPU 11,21,51: converter

20: standby CPU 30: management device

31: switch 33: hub

35: bus switch 40: system block

50: external control module

The present invention for achieving the above object, in the method of dualizing the management port of the duplicated CPU, communication using a bus switch to enable communication with external modules by selecting only the active CPU among the redundant CPU monitoring each other It is characterized by building a line.

In addition, the present invention, when the data communication preparation is completed, the process of checking which CPU is the active CPU, the process of bus switching connection to the active CPU, the connected CPU transmits and receives a packet communication with the module and the active, If an error occurs in the CPU, the bus switch of the management device switches the standby CPU to be connected to the module, and the newly activated CPU and the module includes a process of transmitting and receiving packets and communicating.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described.

3 is a block diagram showing an overview of the present invention. As shown, a bus switch 35 that physically switches packets of an active CPU 10 / standby CPU 20 that uses the same MAC and monitors each other's status and a redundant CPU with one MAC. And a system block 40 that communicates with the CPU connected from the management device 30.

In the present invention having the above configuration, since the MACs of the active CPU and the standby CPU are the same, the system block 40 does not consider the MAC.

In addition, since the management device 30 physically switches packets only when switching, no separate program is required.

If an abnormality is detected while monitoring the CPU in the management device 30, a switching operation for physically switching the active CPU and the standby CPU is performed, and the system block 40 can communicate with the MAC A as before.

Therefore, the system block 40 does not need to detect the change of active / standby at all, and the management device 30 may be physically switched at the moment of switching.

4 shows an embodiment in which the present invention is actually implemented, and illustrates the use of a bus switch 37 to control a redundant CPU from the outside.

As shown, a management apparatus 30 including an active CPU 10 / standby CPU 20 using the same MAC and a bus switch 37 for switching only the active CPU to communicate with the external CPU control module 50. ) And transducers (11, 21, 51).

In the above, the bus switch 37 processes only the packets of the active CPU, passes through the converter, and informs the external CPU control module 50. In this case, since the external module 50 does not change the MAC even if it is switched, there is no problem in communication, and the bus switch 37 also performs a physical switching operation when the switch is made, so there is no fear of packet collision. No separate packet blocking is needed.

Hereinafter, the operation of the present invention will be described briefly.

When the data communication preparation is completed, the management apparatus checks which CPU is the active CPU, a bus switching connection to the CPU determined as the active CPU, the connected CPU sends and receives a packet to communicate with the module, and When an error occurs in the active CPU, the bus switch of the management device switches the standby CPU to be connected with the module, and the newly activated CPU and the module transmit and receive packets to communicate with each other.

In the above active / standby CPU determination, two CPUs transmit their state to the management apparatus, and the management apparatus determines which active CPU is based on this, and performs a switching operation immediately when an error occurs.

In the present invention, since the physical switching operation is performed, packet collision does not occur when switching, and since the same MAC is used, the switching of the MAC is not considered.

Claims (4)

In the method of duplexing the management port of the duplicated CPU, A method of redundancy of a management port using a bus switch, characterized in that a communication line is constructed using a bus switch to select only an active CPU from among the redundant CPUs monitoring each other to communicate with an external module. The method of claim 1, The redundant CPU is a management port duplication method using a bus switch, characterized in that using the same MAC. In the method of duplexing the management port of the duplicated CPU, When the data communication is ready, the process of checking which CPU is the active CPU, Bus switching access to an active CPU, The connected CPU sends and receives packets to and from the module and communicates with each other; If an error occurs in the active CPU, the bus switch of the management unit switches the standby CPU to connect with the module, A method of duplication of a management port using a bus switch, characterized in that the newly activated CPU and the module includes the process of transmitting and receiving packets. The method of claim 3, wherein The redundant CPU is a management port duplication method using a bus switch, characterized in that using the same MAC.