JPH07121015B2 - Redundant control method of bridge device between local area networks - Google Patents

Description

The present invention relates to a duplex control system for a bridge device between local area networks.

[Conventional technology]

Conventionally, in a duplexed bridge device that passes necessary data between two local area networks, when one bridge device fails, the failed device is manually disconnected from the system and the other normal bridge device is activated. Was there.

[Problems to be Solved by the Invention]

In the above-described conventional duplex control method for a bridge device between local area networks, when one bridge device fails, the maintenance person manually switches to the other normal bridge device, so that there are very many switching operations when an abnormality occurs. There is a problem that it takes time and data that should pass through the bridge device is lost during that time.

An object of the present invention is to control system switching of a bridge device between local area networks which are duplicated by a central processing unit, and to open and close an output gate to a local area network for a difference between active and inactive bridge devices. It is to provide a duplicated control method for a bridge device between local area networks that is only in a state.

[Means for Solving the Problems]

According to the present invention, there is provided a central processing unit for performing system switching control of a duplicated bridge device that passes necessary data between two local area networks, and each of the bridge devices stores its active / inactive state. An activation / deactivation information storage circuit, an operation information storage circuit for storing filtering information and statistical data collected at activation, and an activation / deactivation information storage circuit for the activation / deactivation information storage circuit according to activation / deactivation instruction information from an external control means. It is obtained from a redundant control system of a bridge device between local area networks, characterized by comprising a control circuit for rewriting the contents and controlling activation / deactivation of a bridge function.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a duplex control system for a bridge device between local area networks according to the present invention.

In FIG. 1, this embodiment is composed of duplexed bridge devices (hereinafter BRGs) 1 and 2, and a central processing unit (hereinafter CPU) 3 that controls the BRGs 1 and 2.

BRG1 and BRG2 are A side local area network (hereinafter LANA) 4 and B side local area network (hereinafter LA
NB) 5 is a device for exchanging data between two local area networks. BRG1, 2 are connected to CPU3 through control bus (CBS) 6, and CPU3
Controls the active and inactive states of BRG1,2.

BRG1 is the A side transmitter circuit (hereinafter RSA) 11, B side transmitter circuit (hereinafter R
SB) 12, control information transmission circuit (hereinafter RSC) 13, filter circuit (hereinafter FIL) 14, control circuit (hereinafter CTL) 15, operation information memory circuit (hereinafter OPM) 16, active / inactive information memory circuit (hereinafter ME)
M) 17, CTL15 is RSA11, RSB12, RSC13,
Controls OPM16 and MEM17. BRG1 is LANA4 through RSA11
It connects to LANB5 through RSB12, and connects to CBS6 through RSC13. RSA11 connects with RSB12 through FIL14, FIL14 connects with OPM16 through CTL15, OPM16
Data is filtered using the operation information stored in. Also, RSA11 and RSB12 are respectively connected to MEM17 through CTL15, and CTL15 allows data transmission to RSA11 and RSB12 when activated by using the activation / deactivation information stored in MEM17, and prohibits data transmission when inactivated. Control.

BRG2 is RSA21, RSB22, RSC23, FIL24, CTL25, OP like BRG1
It is composed of M26 and MEM27 and has the same function as BRG1.

CPU3 consists of RSC31, central control circuit (hereinafter CC) 32, management information storage circuit (hereinafter MGM) 33, CC32 is RSC31 and MGM33
Connected to. RSC31 is RSC of BRG1,2 through CBS6
It is connected to 13,23. CC32 monitors BRG1, 2 through RSC31, CBS6 according to the management information of MGM33.

Next, the operation of this embodiment will be described.

The CPU3 controls the redundant control of BRG1 and 2 from the initial setting during operation. At the time of initial setting, CPU3 from MGM33 to BRG1,2
Default value of active or inactive information and LA
It reads the filtering information that passes between NA4 and LANB5, instructs CC32 and sends it to BRG1 and BRG2 respectively.

Here, a case where BRG1 is activated and BRG2 is inactivated will be described as an example. The BRG1 receives the activation instruction information and the filtering information sent from the CPU3 at the RSC13 and stores the activation instruction information and the filtering information in the MGM17 and the OPM16 through the CTL15. Then CTL15 is OPM16
The FIL14 is controlled by reading the filtering information from. Further, CTL15 reads the activation instruction information from MEM17, opens the transmission gates of RSA11 and RSB12, and activates the bridge function of BRG1.

Therefore, the data flowing through LANA4 is received by RSA11 and FIL14
Sent to. In FIL14, it is judged whether the received data needs to be sent to LANB5, the necessary data such as the number of passing data is stored in OPM16 through CTL15, and if it is the data to pass BRG1, it is sent to LANB5 through RSB12. .
If the data does not pass BRG1, FIL14 to RSB12
Does not send data to. Data flowing through LANB5 is similarly processed by BRG1 and sent from RSA11 to LANA4 as needed.

On the other hand, the BRG2 receives the deactivation instruction information and the filtering information sent from the CPU3 at the RSC23 and stores them in the MEM27 and the OPM26 through the CTL25. Then CTL25 is OPM26
The FIL24 is controlled by reading the filtering information from. In addition, CTL25 reads the inactivity information from MEM27 and RS
Open the reception gates of A21 and RSB22, close the transmission gates and BRG
Deactivate the bridge function of 2.

Therefore, the data flowing through LANA4 is received by RSA21 and FIL24.
Sent to. The FIL24 determines whether the received data is data that needs to be sent to the LANB5, stores the necessary data such as the number of passing data in the OPM26 through the CTL25, and then sends it to the RSB22 if it is the data to pass the BRG2. Data is not sent to LANB5 because the transmission gate of is closed. If the data does not pass through BRG2, FIL24 to RSB22
Does not send data to. The data flowing through LANB5 is also processed in BRG2.

As described above, in this embodiment, the difference between the bridge device in the active state (BRG1) and the bridge device in the inactive state (BRG2) from the time of initial setting is only the contents stored in MEM17 and MEM27. The filtering information stored in the OPMs 16 and 26 and the statistical data such as the number of passing data collected during operation are the same. Therefore, even if a double system switching occurs, the above-mentioned collected data is not lost and the system can be switched in a very short time.

Next, the system switching operation during operation will be described.

During operation, the CC32 of the CPU3 sends a health check command to the CTL15 and 25 of the BRG1 and 2 in order to confirm the normality of operation. Upon receiving this health check command from the RSCs 13 and 23, the CTLs 15 and 25 confirm the normality of the operation within the RGs 1 and 2 and return a response to the CC 32. CC32 analyzes the contents of this response to judge the normality of BRG1,2. CC32 periodically sends the above health check command to BRG
Monitor the operation of 1 and 2.

If the BRG1 cannot operate normally due to a failure or the like, the CPU3 rewrites the active / inactive information stored in the MGM33 to change the BRG1 information from active to inactive. Next, CC32 was activated to BRG1 to RSC3
1, Send inactivation instruction through CBS6. RSC1 for BRG1
3 receives this inactivation instruction and stores it in MEM17 through CTL15. CTL15 instructs RSA11 and RSB12 to close their transmission gates. Therefore, the bridge function of BRG1 becomes inactive. Next, CPU3 similarly sends an activation instruction to BRG2. In BRG2, the transmission gates of RSA21 and RSB22 are opened to change the bridge function from the inactive state to the active state. As a result, the active / inactive system switching of BRG1, 2 is performed, and BRG2 is put into the operating state.

〔The invention's effect〕

As described above, the present invention includes a central processing unit that performs system switching control of a redundant bridge device that passes necessary data between two local area networks,
Each bridge device has an active / inactive information storage circuit that stores the active / inactive state, an operation information storage circuit that stores filtering information and statistical data collected when active,
And a control circuit for rewriting the contents of the activation / deactivation information storage circuit according to activation / deactivation instruction information from the external control means and controlling activation / deactivation of the bridge function, that is, a bridge device between local area networks The system switching is controlled by the central processing unit, and the only difference between the active and inactive bridge devices is the open / closed state of the output gate to the local area network. Since there is no loss of data that should pass through the bridge device, there is no need for data copying or initial setting procedure, and the active / inactive state can be switched immediately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a duplex control system for a bridge device between local area networks according to the present invention. 1,2 ... Bridge device (BRG), 3 ... Central processing unit (CP
U), 4 ... A side local area network (LANA),
5 ... B side local area network (LANB), 6 ... control bus (CBS), 11, 21 ... A side transceiver circuit (RSA), 12, 22
... B side transceiver circuit (RSB), 13,23,31 ... Control information transceiver circuit (RSC), 14,24 ... Filter circuit (FIL), 15,25 ... Control circuit (CTL), 16,26 ... Operation information storage Circuit (OPM), 17,
27 ... Active / inactive information storage circuit (MEM), 32 ... Central control circuit (CC), 33 ... Management information storage circuit (MGM).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04L 12/66

Claims (1)

[Claims] 1. A central processing unit for performing system switching control of a redundant bridge device for passing necessary data between two local area networks, wherein each of the bridge devices stores an active / inactive state. / Inactive information storage circuit, an operation information storage circuit for storing filtering information and statistical data collected at the time of activation, and an active / inactive information storage circuit for the active / inactive information storage circuit according to activation / inactivation instruction information from the central processing unit. A duplex control method for a bridge device between local area networks, comprising: a control circuit that rewrites the contents and controls activation / deactivation of only a transmission function in a bridge function.