JP2002281085A - System for diagnosing dual packet switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the normality of a line part without imposing any load on an operating system packet changeover switch part of a dual packet switch. SOLUTION: This device is provided with a circuit part 1 connected between a transmission path and operating system and preliminary system packet changeover switch parts (SW0) 2 and (SW1) 3 and a CPU part 4 or 5 for interrupting the output from the line part 1 to the operating system packet changeover switch part (SW0) 2 in diagnosing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex packet switch, and more particularly to a method of diagnosing a duplex packet switch.

[0002]

2. Description of the Related Art In order to improve the reliability of communication, a packet switch has a dual configuration of an operation (ACT) packet switch and a backup (SBY) packet switch. Such a packet switch is connected to a transmission line via a line unit.

In order to confirm the normality of the line section connected to the transmission line, first, a backup (SBY) packet switching switch section is diagnosed to confirm normality, and then a test packet is inserted from the line section. The operation of exchanging test packets in the packet switching switch section of the operation (ACT) system and receiving and checking the test packets in the line section is performed.

However, in such a method for confirming the normality of the line unit, the test packet inserted in the line unit is exchanged by the packet switching switch unit of the operation (ACT) system. The load is applied to the packet switching switch unit, and the data communication speed is reduced.

When a test packet is exchanged in the operation (ACT) system packet exchange switch section, a backup (SB) is issued.
Since the output from the Y) system packet switch cannot be obtained, the normality of the interface between the line unit to be diagnosed and the spare (SBY) packet switch cannot be confirmed.

[0006] As a conventional example of a packet switch, Japanese Unexamined Patent Publication No.
According to Japanese Patent Publication No. 188916, a load test is performed without preparing a test apparatus by storing an online program and a test program in each of a system 0 and a system 1 of a duplicated packet switch, and connecting a line corresponding unit of each system. Discloses a packet switch having a separation type test function capable of performing a pseudo call test.

In Japanese Patent Application Laid-Open No. Hei 7-162456, a simple structure is used to enable the return of a packet to an arbitrary line in order to verify the normality of a packet path in a packet switch. A packet switch which enables a turn-back test from a PC is disclosed.

Japanese Patent Application Laid-Open No. 4-371044 relates to a packet communication system in a packet switching network accommodating a duplexed terminal device, and a packet which minimizes the interruption period of operation even when the terminal device is changed. A communication test scheme is disclosed.

Japanese Patent Laid-Open Publication No. Hei 5-102968 relates to a method for diagnosing a failure of a packet switching device by a single system, and two identical single systems are installed to form a pseudo 0/1 system. Thus, a method of diagnosing a single system that performs diagnosis equivalent to duplexing is disclosed.

In Japanese Patent Application Laid-Open No. Hei 8-163165, operation management is continued and high reliability is ensured even if a failure occurs in the network management device and network components by duplicating the network management device. A network management method is disclosed.

Further, in Japanese Patent Application Laid-Open No. 8-195767, it is diagnosed whether or not a backup ring is present without stopping the system operation of a station that communicates via the main ring on a duplex network composed of a main ring and a backup ring. A method for monitoring a backup ring is disclosed.

Japanese Patent Application Laid-Open No. Hei 5-227183 discloses an abnormality diagnosis method for a loop transmission system capable of quickly operating, stopping, and restarting a duplicated loop transmission line system and autonomously coping with multiple failures. Have been.

In Japanese Patent Laid-Open Publication No. 1-122235, in a trunk line diagnosis system for a packet switching network in which packet switches are connected to each other by a plurality of trunk lines, a line test of the trunk line when a failure occurs is performed. A trunk line diagnosis system that can be executed between the packet switches at both ends is disclosed.

Further, Japanese Patent Application Laid-Open No. 61-154243 discloses a faulty section detection method capable of correctly specifying a faulty section in a data transfer system in which a plurality of data transfer devices are connected in series.

[0015]

SUMMARY OF THE INVENTION An object of the present invention is to provide a diagnostic system for a duplexed packet switch which can confirm the normality of a line unit without applying a load to a packet switching switch of an operating system of the duplexed packet switch. To provide.

Another object of the present invention is to provide a diagnosis method for a duplex packet switch capable of diagnosing the normality of an interface between a line section to be diagnosed and a standby packet switching switch section.

[0017]

The diagnostic system for a duplex packet switch according to the present invention comprises a line unit 1 and CPU units 4 and 5. The line unit 1 is connected between the transmission line and the active and standby packet switching switch units (SW0) 2 and (SW1) 3, and controls the line unit 1 by an external signal. At the time of diagnosis, the CPU unit 4 or 5 switches the active or standby packet switching switch unit (SW0) 2, (SW1) 3.
The line unit 1 is controlled so as to cut off the output to the line.

The CPU section 4 or 5 controls the line section 1 so as to arbitrarily select the output from the active or standby packet switching switch sections (SW0) 2 and (SW1) 3.

At the time of diagnosis, the CPU unit 4 or 5
Generate a test packet to be inserted into Line 1
Inserts a test packet in response to a signal from the CPU unit 4 or 5.

The inserted test packets are sent to the active and standby packet switching switches (SW0) 2, (SW0).
1) Exchanged by 3. The line unit 1 receives the exchanged test packet.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the accompanying drawings, an embodiment of a diagnostic system for a duplex packet switch according to the present invention will be described below.

FIG. 1 is a block diagram showing the configuration of a diagnostic system for a duplex packet switch according to the present invention.

As shown in FIG. 1, the diagnostic system for a duplex packet switch according to the present invention includes a line unit 1 and a 0-system CPU unit (CPU unit) 4 or a 1-system CPU unit (CPU unit) 5. The line unit 1 is connected to the 0-system CPU unit 4 and the 1-system CPU unit 5, and has a transmission line, an operation (ACT) system, and a standby (S
BY) system packet switching switch unit (SW0) 2, (S
W1) 3. Each of the 0-system CPU unit 4 and the 1-system CPU unit 5 is connected to the active and standby packet switching switches (SW0) 2 and (SW1) 3, and controls the line unit 1 by external signals. 0 system C
At the time of diagnosis, the PU unit 4 or the 1-system CPU unit 5 operates the active or standby packet switching switch unit (SW0) 2, (SW0).
1) The line unit 1 is controlled so that the output to 3 is cut off.
Further, the CPU unit 4 or 5 controls the line unit 1 so as to select the output from the standby packet switching switch unit (SW1) 3 at the time of diagnosis.

The line unit 1 is an interface on a transmission line with another packet switch (not shown).
And a downlink section 7.

The upstream line unit 6 includes a 0-system cutoff unit (blocking unit) 13 connected to the active packet switching switch unit (SW0) 2 and a standby packet switching switch unit (SW).
1) The received packet processing unit 12 connected to the 1-system blocking unit (blocking unit) 14, the 0-system blocking unit (blocking unit) 13 and the 1-system blocking unit (blocking unit) 14 connected to 3, and the blocking setting. Part 15
A reception selection unit (RSEL) 9 connected to the reception packet processing unit 12, an uplink interface unit 8, a test packet insertion unit 10, and a test selection unit 11 connected to the reception selection unit (RSEL) 9. ing.

The downlink section 7 includes a route selection section 20 and a communication path ACT determination section (SWA) connected to the active and standby packet switching switches (SW0) 2 and (SW1) 3.
CT) 22 and a standby packet switching switch (SW)
1) a 1-system cutoff unit (blocking unit) 14 connected to 3; a transmission packet processing unit 19 connected to a route selection unit 20; a route selection unit 20 and a call path ACT determination unit (SWACT) 2
2 is a route selection signal selection unit (PSEL) 21 connected to
And a test route setting unit (TSDAT) 23 and a route selection signal selection instructing unit (TTSSEL) 24 connected to the route selection signal selection unit (PSEL) 21, and the test selection unit 11 of the uplink 6. A transmission selection unit (SSEL) 17 connected to the packet processing unit 19, and a transmission selection unit (SS
EL) 17 connected to the downlink interface unit 16
And a test packet receiving unit 18.

First, the uplink section 6 will be described.

Uplink interface section 8 is connected to a transmission path to another packet switch (not shown) and receives normal packets from the transmission path.

0 system CPU unit (CPU unit) 4 or 1 system CP
U section (CPU section) 5 generates a test packet to be inserted into uplink section 6 at the time of diagnosis. At the time of diagnosis, the test packet insertion unit 10 sets the 0-system CPU unit (CPU unit) 4
Alternatively, in response to a signal from the first system CPU unit (CPU unit) 5, a test packet is inserted into the uplink unit 6 and transmitted to the reception selection unit (RSEL) 9.

The test selecting unit 11 sets the 0-system CP
In response to a signal from the U section (CPU section) 4 or the 1-system CPU section (CPU section) 5, a selection instruction signal for instructing selection of a test packet is received by the reception selection section (RSEL) 9, the downlink section 7 To the transmission selection unit (SSEL) 17.

The reception selection unit (RSEL) 9 selects one of the test packet from the test packet insertion unit 10 and the normal packet from the uplink interface unit 8 for transmission to the reception packet processing unit 12. I do. This reception selection unit (RSEL) 9
The test packet is selected in response to the selection instruction signal from the control unit 1.

The received packet processing unit 12 performs data processing on the test packet or the normal packet selected by the reception selecting unit (RSEL) 9. The data processed by the received packet processing unit 12 is exchanged by one of the active packet switching switch unit (SW0) 2 and the standby packet switching switch unit (SW1) 3.

0 system CPU unit (CPU unit) 4 or 1 system CP
The U unit (CPU unit) 5 shuts off the system 0 cutoff unit (cutoff unit) 13 or the system 1 cutoff unit (cutoff unit) 14 so as to cut off the output of the data processed by the received packet processing unit 12 at the time of diagnosis. The setting unit 15 is controlled. The cutoff setting unit 15 includes a 0-system CPU unit (CPU unit) 4 or a 1-system CPU unit (C
A cut-off instruction signal for instructing the 0-system cut-off unit (cut-off unit) 13 or the 1-system cut-off unit (cut-off unit) 14 to be cut off by any control of the PU unit 5 is set, and the set cut-off setting unit Reference numeral 15 sends a cutoff instruction signal to the 0-system cutoff unit (cutoff unit) 13 or the 1-system cutoff unit (cutoff unit) 14.

The 0-system cutoff unit (cutoff unit) 13 cuts off the output of the data processed by the received packet processing unit 12 at the time of diagnosis in response to the cutoff instruction signal from the cutoff setting unit 15.

In response to a cutoff instruction signal from the cutoff setting unit 15, the first system cutoff unit (blocking unit) 14 outputs data processed by the received packet processing unit 12 to the first system packet switching switch unit (SW1) 3 during diagnosis. I do.

Next, the downlink 7 will be described.

Operational packet switch unit (SW)
0) 2 and standby packet switching switch unit (SW1)
3 is exchanged with the route selection unit 2
Sent to 0.

0-system CPU unit (CPU unit) 4 or 1-system CP
The U unit (CPU unit) 5 controls the communication path AC so that the system information of the active packet switching switch unit (SW0) 2 is determined.
The T determining unit (SWACT) 22 is controlled. Call channel ACT
At the time of diagnosis, the decision unit (SWACT) 22 includes a system ACT signal from the active packet switching switch (SW0) 2 and a standby packet switching switch (SW1) 3
In response to the SBY signal of the system, the system information of the active packet switching switch (SW0) 2 is sent to the route selection signal selector (PSEL) 21.

0-system CPU unit (CPU unit) 4 or 1-system CP
At the time of diagnosis, the U unit (CPU unit) 5 transmits a test packet exchange switch unit (standby packet exchange switch unit (SW)
1) The test route setting unit (TSTDAT) 23 is controlled so that the system information of 3) is set. The test route setting unit (TSTDAT) 23 includes a 0-system CPU unit (CPU unit).
The system information of the test system packet switching switch unit is set by the 4 or 1 system CPU unit (CPU unit) 5, and the test route setting unit (TSDAT) 23 converts the set system information into the route selection signal selection unit (PSEL). ) 21.

Route selection signal selection instructing section (TTSSEL)
Numeral 24 is for responding to a signal from the 0-system CPU unit (CPU unit) 4 or the 1-system CPU unit (CPU unit) 5 to instruct the route selection signal selection unit (PSEL) 21 to select a route. A route selection instruction signal is transmitted.

The route selection signal selection unit (PSEL) 21
0-system CPU unit (CPU unit) 4 or 1-system CPU unit (CPU
Unit) 5 in response to the signal from the unit 5, and based on the route selection instruction signal from the route selection signal selection instruction unit (TTSSEL) 24, the active system packet switching switch unit (SW 0) 2 and the standby system A route selection signal for selecting the route of the switch unit (SW1) 3 is sent to the route selection unit 20.

0-system CPU unit (CPU unit) 4 or 1-system CP
The U section (CPU section) 5 selects the data exchanged by one of the active packet switching switch section (SW0) 2 and the standby packet switching switch section (SW1) 3 so as to select the data. Control. Route selector 2
0 is based on the route selection signal from the route selection signal selection unit (PSEL) 21 based on the 0-system packet switching switch unit (S
W0) 2 and 1-system packet switching switch (SW1) 3
And receives the data exchanged by either the selected 0-system packet switching switch (SW0) 2 or 1-system packet switching switch (SW1) 3.

The transmission packet processing unit 19 includes the route selection unit 2
Process data selected at 0.

The transmission selection unit (SSEL) 17 responds to the selection instruction signal from the test selection unit 11 of the uplink unit 6 and converts the data processed by the transmission packet processing unit 19 into the downlink interface unit 16 or the test packet. It selects which of the receiving units 18 to output.

The test packet receiving unit 18 transfers the data processed by the transmission packet processing unit 19 from the transmission selection unit (SSEL) 17 to the 0-system packet exchange switch unit (SW0) 2 or the 1-system packet exchange switch unit (SW).
1) Received as a test packet exchanged to any of 3 above.

The downlink interface section 16 is connected to a transmission path with another packet switch (not shown), and the data processed by the transmission packet processing section 19 from the transmission selection section (SSEL) 17 is transmitted to the transmission path as a normal packet. Send out.

Next, a description will be given of a failure detection operation as an operation of the diagnostic system of the duplexed packet switch with reference to FIG.

FIG. 2 is a flowchart showing the operation of the diagnostic system of the duplex packet switch according to the present invention.

As shown in FIG. 2, the 0-system CPU unit (C
The PU unit 4 or the 1-system CPU unit (CPU unit) 5 controls the line unit 1 by an external signal. 0 system CPU (C
The PU unit 4 or the first-system CPU unit (CPU unit) 5 controls the line unit 1 so that the test selecting unit 11 selects the test packet inserting unit 10 and the test packet receiving unit 18 (step S1). .

Next, the 0-system CPU unit (CPU unit) 4 or the 1-system CPU unit (CPU unit) 5 interrupts the output to the 0-system packet exchange switch unit (SW0) 2 and the 1-system packet exchange switch unit (SW0). SW1) The cutoff setting unit 15 is controlled so as to output the signal to the SW3. At this time, the 0-system cut-off unit (cut-off unit) 13 and the 1-system cut-off unit (cut-off unit) 14 are operated by the cut-off setting unit 15, and the operation (ACT) system 0-system packet switching switch unit (SW 0) 2 is connected. The output is cut off, and the standby (SBY) system 1-system packet switching switch (SW1)
3 is enabled (step S2).

When such setting is completed, the 0-system CPU
Unit (CPU unit) 4 or 1-system CPU unit (CPU unit) 5
A standby (SBY) system 1-system packet switching switch (SW
1) The test route setting unit (TSTDAT) 2
3 (step S).
3).

At this time, the 0-system CPU unit (CPU unit) 4 or the 1-system CPU unit (CPU unit) 5 causes the route selection signal selection instructing unit to select the output of the test route setting unit (TSTDAT) 23. By controlling the (TTSSEL) 24, the route selection signal selection unit (PSEL) 21 selects the system information of the first system packet switching switch unit (SW1) 3 based on the setting of the test route setting unit (TSTDAT) 23. (Step S4).

Then, the 0-system CPU unit (CPU unit) 4 or the 1-system CPU unit (CPU unit) 5 transmits the line unit 1 so that the test packet from the test packet insertion unit 10 is inserted.
Control. The inserted test packet is output from the reception selection unit (RSEL) 9 to the reception packet processing unit 12, and after data processing is performed by the reception packet processing unit 12, the backup packet is output from the 1-system interruption unit (interception unit) 14. SBY)
The data is output to the system 1 packet switching switch (SW1) 3 (step S5).

1-system packet switching switch (SW1) 3
The test packet subjected to the exchange processing is output from the route selection unit 20 to the transmission packet processing unit 19, subjected to data processing by the transmission packet processing unit 19, and received by the test packet reception unit 18. (CP
The test packet received by the U unit 4 or the first system CPU unit (CPU unit) 5 is read (step S6). The read test packet is transmitted to the transmission selection unit (SSEL) 1
7 is compared with the test packet inserted in step S5 (step S7). As a result of the comparison, if the test packets match (step S8-YES), the process ends normally. If the test packets do not match (step S8-NO), a failure process (step S9) is performed and the process ends.

As described above, in the present embodiment, the 0-system CP
U section (CPU section) 4 or 1-system CPU section (CPU section) 5
Is used to control the output from the line section 1 to the operation (ACT) system 0 packet switching switch section (SW0) 2 so as to shut off the output.
The normality of the line unit 1 can be confirmed without applying a load to the 0-system packet switching switch unit (SW0) 2 of the CT) system.

In the present embodiment, the 0-system CPU unit (CPU unit) 4 or the 1-system CPU unit (CPU unit) 5 reserves the test packet inserted from the test packet insertion unit 10 of the line unit 1. In order to perform control so as to compare the inserted test packet with the received test packet after being exchanged by the 1-system packet exchange switch unit (SW1) 3 of the (SBY) system and received by the test packet receiving unit 18, The normality of the interface between the line unit 1 to be diagnosed and the standby (SBY) 1-system packet switching switch unit (SW1) 3 can be diagnosed.

In the present embodiment, a case has been described in which a test packet is output from the 1-system cutoff unit (blocking unit) 14 to the 1-system packet switching switch unit (SW1) 3 at the time of diagnosis. However, the present invention is not limited to this example. Instead, as a second embodiment of the diagnostic system for the duplexed packet switch according to the present invention, a configuration may be employed in which the output of the primary system interrupting section (interrupting section) 14 is directly turned back to the route selecting section 20. In this case, since the test packet inserted by the test packet insertion unit 10 in the single line unit 1 is directly received by the test packet receiving unit 18, the diagnosis can be performed by the line unit 1 alone.

[0058]

As described above, according to the diagnostic method of the duplex packet switch of the present invention, the output from the line section to the active packet switch section is cut off at the time of diagnosis. It is possible to check the normality of the line unit without applying a load to the packet switching unit.

Further, according to the diagnostic method of the duplex packet switch of the present invention, after the test packet inserted in the line section is exchanged by the standby packet exchange switch section, the inserted test packet and the received test packet are exchanged. Since the packet is compared with the packet, it is possible to diagnose the normality of the interface between the line unit to be diagnosed and the standby packet switching switch unit.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a diagnostic system of a duplex packet switch according to the present invention.

FIG. 2 is a flowchart showing the operation of the diagnostic system of the duplex packet switch according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Line part 2 0 system packet exchange switch part (SW0) 3 1 system packet exchange switch part (SW1) 4 0 system CPU part (CPU part) 5 1 system CPU part (CPU part) 6 Up line part 7 Down line part 8 Uplink interface unit 9 Reception selection unit (RSEL) 10 Test packet insertion unit 11 Test selection unit 12 Receive packet processing unit 13 0 system interruption unit (interruption unit) 14 1 system interruption unit (interruption unit) 15 interruption setting unit 16 downlink Interface unit 17 Transmission selection unit (SSEL) 18 Test packet reception unit 19 Transmission packet processing unit 20 Route selection unit 21 Route selection signal selection unit (PSEL) 22 Communication channel ACT determination unit (SWACT) 23 Test route setting unit ( TSTDAT) 24 Route selection signal selection instruction section (TTSSEL)

Claims (4)

[Claims] 1. A line unit connected between a transmission line and a packet switching switch unit of an operation system and a protection system, and an output to the packet switching switch unit of the operation system or the protection system is shut off at the time of diagnosis. C that controls the line unit
A diagnosis method for a duplex packet switch including a PU unit. 2. The diagnostic method for a duplex packet switch according to claim 1, wherein the CPU controls a line unit to arbitrarily select an output from the active or standby packet switch. Diagnosis method for duplicated packet switch. 3. The diagnostic method for a duplex packet switch according to claim 1, wherein the CPU generates a test packet to be inserted into the line at the time of diagnosis, and the line includes the CPU. A diagnostic method for a duplex packet switch, wherein the test packet is inserted in response to a signal from a unit. 4. The diagnostic method for a duplex packet switch according to claim 3, wherein the inserted test packets are exchanged by the active and standby packet exchange switch units, and the line unit is exchanged. Diagnostic method for a duplex packet switch that receives test packets.