JP5351004B2 - Packet switching equipment - Google Patents

Description

  The present invention relates to a packet switching apparatus connected to a layer 2 network and performing a packet relay operation.

Patent Document 1 describes a layer 2 network equipped with a function for shortening the path switching time in a ring network configuration and expanding the number of connected layer 2 switches.
Further, Patent Document 2 describes a packet switching apparatus configured to be able to maintain a network even during a power failure.

JP 2007-174119 A (pages 5 to 9, FIG. 1) JP2009-111482A (pages 4-5, FIG. 1)

Neither Patent Document 1 nor Patent Document 2 describes the operation at the time of starting the apparatus.
If both functions described in Patent Document 1 and Patent Document 2 are provided, a highly reliable network can be realized.
However, when combining the above-mentioned functions, since the relay operation is performed by the bypass route at the time of power-up, as in the case of a power failure, the master device and the slave device at the end point (hereinafter referred to as “end-point slave device”) The edge device also has a problem that the packet is relayed, there is no blocking node, and an infinite circulation of the packet occurs.
Further, as described above, since the master device or the edge device performs the relay operation by the bypass route even in the event of a power failure, there is no blocking node, and in this case, there is a problem that an infinite circulation of the packet occurs. .

  The present invention has been made to solve the above-described problems, and is a packet exchange that is connected to a layer 2 network and performs a relay operation in the event of a power failure without causing an infinite circulation of packets at the time of activation. The purpose is to obtain a device.

The packet switching apparatus according to the present invention is a packet switching apparatus having a branch port and connected to a ring-shaped network through two ring ports and relaying packets between the ports. The branch line terminates the branch port. Line termination unit, two ring line termination units that respectively terminate two ring ports, a ring line termination transmission control unit that controls transmission of packets from the ring line termination unit to the network, and a packet switching unit that relays packets between ports A power supply configured to supply power input from outside via an external power supply terminal to each unit and to supply power only to the ring line termination unit and the ring line termination transmission control unit in the event of a power failure when no power is input from the outside parts, immediately after the power supply from the battery unit, and external supplies power to the power unit during a power failure When dynamic packet switching device comprises a device determining unit determines whether the master device or edge device performs a blocking together with the master device performs a blocking for preventing the endless circulating packet, the ring line terminal transmits control When the determination result by the device determination unit is a master device and an edge device at startup, the unit stops the transmission of the packet from the ring line termination unit, and the determination result by the device determination unit is the master device and the edge device. Otherwise, the packet is directly relayed between the two ring line termination units .

As described above, the present invention is a packet switching apparatus that has branch ports and is connected to a ring-shaped network via two ring ports and relays packets between the ports. The branch line terminates the branch ports. Line termination unit, two ring line termination units that respectively terminate two ring ports, a ring line termination transmission control unit that controls transmission of packets from the ring line termination unit to the network, and a packet switching unit that relays packets between ports A power supply configured to supply power input from outside via an external power supply terminal to each unit and to supply power only to the ring line termination unit and the ring line termination transmission control unit in the event of a power failure when no power is input from the outside parts, battery unit supplies power to the power unit during a power failure, and startup immediately after power supply from the outside, Pas Tsu-switched device comprises a master device or a device determining unit determines whether an edge device performs a blocking together with the master device performs a blocking for preventing the endless circulating packet, the ring line terminal transmission controller When the determination result by the device determination unit is the master device and the edge device at startup, the transmission of the packet from the ring line termination unit is stopped, and the determination result by the device determination unit is other than the master device and the edge device. in some cases, because relays packets directly between the two ring line termination unit, upon start of the packet switching device, while anti skill infinite circulation of packets, it is possible to reduce the interruption point in the network.

It is a block block diagram which shows the packet switching apparatus by Embodiment 1 of this invention. It is a block diagram which shows the network containing the packet switching apparatus by Embodiment 1 of this invention. It is a figure which shows the packet path | route at the time of starting of the packet switching apparatus by Embodiment 1 of this invention. It is a figure which shows the packet relay path | route at the time of the non-power failure of the packet switching apparatus by Embodiment 1 of this invention. It is a figure which shows the packet path | route at the time of the power failure of the packet switching apparatus by Embodiment 1 of this invention. 6 is a flowchart showing the operation of the master apparatus or the edge apparatus by the packet switching apparatus according to the first embodiment of the present invention. It is a flowchart which shows operations other than the master apparatus or an edge apparatus by the packet switching apparatus by Embodiment 1 of this invention. It is a block block diagram which shows the packet switching apparatus by Embodiment 2, 3 of this invention. It is a figure which shows the packet path | route at the time of starting or a power failure when the packet switching apparatus by Embodiment 2, 3 of this invention is a master apparatus or an edge apparatus. It is a figure which shows the packet relay path | route at the time of starting or a power failure when the packet switching apparatus by Embodiment 2, 3 of this invention is other than a master apparatus or an edge apparatus.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
1 is a block diagram showing a packet switching apparatus according to Embodiment 1 of the present invention.
In FIG. 1, a first packet switching apparatus 1 externally receives at least one branch port 2a to 2n, two ring ports 3a and 3b connected to a ring network, and an AC voltage or a DC voltage from the outside of the apparatus. An external power supply terminal 4 is provided.
The first packet switching device 1 has the following.
The branch line termination units 5a to 5n terminate the branch line ports 2a to 2n. The ring line termination units 6a and 6b terminate the ring ports 3a and 3b. The packet switching unit 7 is connected to the branch line termination units 5a to 5n and the ring line termination units 6a and 6b, identifies the destination of the packet input to any port, and relays it to any other port. Based on the voltage supplied from the external power supply terminal 4, the power supply unit 8 converts the voltage into a voltage suitable for each unit and supplies it. When the voltage supplied from the external power supply terminal 4 decreases, the battery unit 9 supplies the voltage to the power supply unit 8 instead.
The ring line termination transmission control unit 10 controls the packet transmission state of the ring line termination units 6a and 6b. The transmission stop signal 11 is transmitted from the ring line termination transmission control unit 10 and stops packet transmission of the ring line termination units 6a and 6b.

The processor unit 12 executes S / W (software) processing and appropriately sets the branch line termination units 5a to 5n, the ring line termination units 6a and 6b, and the packet switching unit 7.
The processor bus 13 is a bus connected from the processor unit 12 to each unit. The power supply line 14 supplies voltage from the power supply unit 8 to the branch line termination units 5 a to 5 n, the packet switching unit 7, and the processor unit 12. The second power supply line 15 supplies a voltage from the power supply unit 8 to the ring line termination units 6 a and 6 b and the ring line termination transmission control unit 10.

FIG. 2 is a block diagram showing a network including a packet switching apparatus according to Embodiment 1 of the present invention.
In FIG. 2, the first packet switching devices 1a to 1n are connected to each other in a ring shape using a ring port to constitute a layer 2 network. The terminal devices 16a to 16n are respectively connected to branch ports of the first packet switching devices 1a to 1n, and transmit / receive packets to / from each other through the first packet switching devices 1a to 1n. The first packet switching device 1 on this network is classified into a master device, an edge device, and a slave device, and the blocking part 30 is determined so that the packet does not go infinitely in the S / W processing in the processor unit 12. Yes.
This blocking is performed between the first packet switching device 1a that is a master device and the first packet switching device 1n that is an edge device. The master device performs blocking, and the edge device controls the blocking by responding to the master device. When the edge device bypasses, the master device releases the blocking, and a packet loop occurs. Therefore, the master device and the edge device are bypass prohibition devices.
Further, the master device and the edge device are configured not to provide a battery unit in advance and not to perform a relay operation at the time of a power failure in order to prevent infinite circulation of packets.
The first packet switching devices 1b to 1d other than the master device and the edge device are slave devices.

FIG. 3 is a diagram showing a packet path when the packet switching apparatus according to the first embodiment of the present invention is activated.
In FIG. 3, 1 to 15 are the same as those in FIG. The packet path 21 is formed between the ring line termination unit 6a and the ring line termination unit 6b, but is a path that prevents packets from going out from the ring ports 3a and 3b to the network.

FIG. 4 is a diagram showing a packet relay path when the packet switching apparatus according to the first embodiment of the present invention is not powered off.
4, 1 to 15 are the same as those in FIG. In the packet path 22 of FIG. 4, a packet input from the ring port 3a is sent from the ring port 3b to the network via the ring line termination unit 6a, the packet switching unit 7, and the ring line termination unit 6b, and the ring port 3b. Are sent from the ring port 3a to the network via the ring line termination unit 6b, the packet switching unit 7, and the ring line termination unit 6a.

FIG. 5 is a diagram showing a packet path at the time of a power failure of the packet switching apparatus according to the first embodiment of the present invention.
In FIG. 5, 1 to 15 are the same as those in FIG. In the packet path 23 of FIG. 5, a packet input from the ring port 3a is sent to the network from the ring port 3b via the ring line termination unit 6a and the ring line termination unit 6b, and is input from the ring port 3b. Is transmitted from the ring port 3a to the network via the ring line termination unit 6b and the ring line termination unit 6a. In other words, it does not go through the packet switching unit 7 but goes directly between the ring line termination unit 6a and the ring line termination unit 6b.

FIG. 6 is a flowchart showing the operation of the master apparatus or edge apparatus by the packet switching apparatus according to the first embodiment of the present invention.
FIG. 7 is a flowchart showing the operation of the packet switching apparatus according to the first embodiment of the present invention other than the master apparatus or the edge apparatus.

Next, the operation will be described. First, the operation at startup will be described.
When power is supplied from the external power supply terminal 4 to the first packet switching device 1 configured as shown in FIG. 1, that is, when there is no power failure, the power supply unit 8 uses the first power supply line 14. Power is supplied to the branch line termination units 5 a to 5 n, the packet switching unit 7 and the processor unit 12, and power is supplied to the ring line termination units 6 a and 6 b and the ring line termination transmission control unit 10 using the second power supply line 15. Supply.
The ring line termination units 6a and 6b are in a state of relaying packets directly between the ring line termination unit 6a and the ring line termination unit 6b without going through the packet switching unit 7 due to initialization immediately after power supply. At this time, the ring line termination control unit 10 sets the transmission stop signal 11 significantly in the initial state immediately after the power supply in order to place the ring line termination units 6a and 6b in the packet transmission stopped state. The route is the packet route 21 of FIG. As a result, the ring line termination units 6a and 6b are in a link-down state, and the first packet switching device 1 does not perform a relay operation even when a packet is input to any one of the ring ports 3a and 3b.

Referring to FIG. 2, when the first packet switching device 1 is in the activated state, the first packet switching device 1 in the ring is in the state shown in FIG. 3 regardless of which terminal device receives the packet. Therefore, no relay operation is performed.
For example, when a packet is relayed through the route of the terminal device 16a → the first packet switching device 1a → the first packet switching device 1b → the first packet switching device 1c → the terminal device 16c, the packet switching device 1a which is the master device If it is active, this relay operation is impossible.
However, infinite circulation of packets output from other terminal devices, which occurs when the packet switching device 1a as the master device performs a bypass operation, does not occur.

From this state, after the processor unit 12 is activated, the processor unit 12 uses the processor bus 13 to connect the branch line termination units 5a to 5n, the ring line termination units 6a and 6b, the packet switching unit 7 and the packet switching unit 7. Through the branch line terminal units 5a to 5n and the ring line terminal units 6a and 6b.
In addition, the processor unit 12 uses the processor bus 13 to notify the ring line termination control unit 10 of the completion of activation, so that the ring line termination control unit 10 sets the ring line termination units 6a and 6b to the transmission state. The stop signal 11 is made involuntary.
This route is as shown in the packet route 22 of FIG. As a result, the first packet switching device 1 relays to one of the other ports according to the destination of the packet input to one of the branch ports 2a to 2n and the ring ports 3a and 3b. .

  Speaking in FIG. 2, at the time of non-power failure after completion of activation of any of the packet switching devices, for example, the terminal device 16a → the first packet switching device 1a → the first packet switching device 1b → the first packet switching device 1c → the terminal When the packet is relayed along the route of the device 16c, the first packet switching device 1b relays the packet along the route shown in FIG.

Next, the operation at the time of power failure will be described.
When power is not supplied from the external power supply terminal 4 to the first packet switching device 1, that is, during a power failure, the power supply unit 8 uses the second power supply line 14 based on the voltage supplied from the battery unit 9. Then, power is supplied only to the ring line termination control unit 10 and the ring line termination units 6a and 6b, and the ring line termination units 6a and 6b are initialized. The ring line termination unit 6a and the ring line termination unit 6b are in a state of directly relaying packets between them. The route is as the packet route 23 in FIG. The ring line termination control unit 10 makes the transmission stop signal 11 insignificant in order to set the state of the ring line termination units 6a and 6b to packet transmission.
As a result, the first packet switching device 1 relays the packet input to the ring port 3a to the ring port 3b, and relays the packet input to the ring port 3b to the ring port 3a.

  Referring to FIG. 2, when the first packet switching device 1b is out of power, for example, the terminal device 13a → the first packet switching device 1a → the first packet switching device 1b → the first packet switching device 1c → the terminal device 13c. When relaying a packet by a route, the first packet switching device 1b relays the packet by a packet route 23 shown in FIG.

Next, operations of the master device (first packet switching device 1a in FIG. 2) and the edge device (first packet switching device 1n in FIG. 2) will be described based on the flowchart in FIG.
The master device and the edge device operate similarly according to FIG. In the following description of FIG. 6, the own device indicates a master device or an edge device.
As a start condition, it is assumed that external power is supplied and the transmission stop signal 11 is involuntary. In step S1, it is determined whether or not the own apparatus is being activated. If it is activated, the transmission stop signal is made significant in step S6. When the activation is completed, the transmission stop signal is made insignificant in step S2. Next, in step S3, it is determined whether or not the external power supply is stopped. If the external power supply is stopped, the apparatus is stopped in step S4.
Next, in step S5, it is determined whether external power supply is started. If external power supply is started, the process proceeds to step S1.

Next, operations of slave devices other than the master device and the edge device will be described with reference to the flowchart of FIG. In the description of FIG. 7 below, the own device indicates a slave device.
As a start condition, it is assumed that external power is supplied and the transmission stop signal 11 is involuntary. In step S11, it is determined whether or not the own apparatus is being activated. If it is activated, the transmission stop signal is made significant in step S16, and when the activation is completed, the transmission stop signal is made insignificant in step S12. Next, in step S13, it is determined whether or not the external power supply is stopped. If the external power supply is stopped, the relay operation at the time of power failure is started in step S14. In this relay operation at the time of power failure, power is supplied from the battery unit 9 only to the ring line termination transmission control unit 10 and the ring line termination units 6a and 6b, and the transmission stop signal 11 is made unintentionally. The packet is relayed through a direct route between the termination units 6b.
Next, in step S15, it is determined whether external power supply is started. If external power supply is started, the process proceeds to step S11.

  According to the first embodiment, the first packet switching device can prevent the infinite circulation of the packet that occurs because the blocking part disappears by stopping the relay operation at the time of activation. If this occurs, normal relay operation is possible.

Embodiment 2. FIG.
FIG. 8 is a block diagram showing a packet switching apparatus according to Embodiment 2 of the present invention.
In FIG. 8, 2 to 15 are the same as those in FIG. The second packet switching device 17 includes a device determination unit 18 in addition to the configuration of FIG. The device determination unit 18 determines whether the device itself is a master device or an edge device, and notifies the ring line termination transmission control unit 10 by a determination signal 19. The determination by the device determination unit 18 is based on a method of setting the master device and the edge device with a switch, for example.

FIG. 9 is a diagram showing a packet path at startup when the packet switching apparatus according to the second embodiment of the present invention is a master apparatus or an edge apparatus.
9, 2 to 15, 18, and 19 are the same as those in FIG. 8, and 21 is the same as that in FIG.

FIG. 10 is a diagram showing a packet relay path at startup when the packet switching apparatus according to the second embodiment of the present invention is other than the master apparatus or the edge apparatus.
10, 2 to 15, 18, and 19 are the same as those in FIG. 8, and 23 is the same as that in FIG.

The second embodiment relates to the operation at the time of startup.
The second packet switching device 17 determines whether the device is a master device or an edge device at the device determination unit 18 in FIG. 8 when the device is started immediately after power is supplied from the external power supply terminal 4. The result is transmitted to the ring line termination transmission control unit 10 by the determination signal 19.
When the own apparatus is a master apparatus or an edge apparatus, the ring line termination transmission control 10 makes the transmission stop signal 11 significant and stops the packet relay as shown in FIG.
When the own apparatus is other than the master apparatus or the edge apparatus, the transmission stop signal 11 is ignored and the relay operation by the packet relay path 23 is enabled as shown in FIG.

  According to the second embodiment, when the second packet switching device starts up immediately after power supply, only the master device and the edge device are set in the relay operation stop state, and the other nodes are allowed to perform the relay operation. While preventing infinite laps, it is possible to minimize the number of disconnected points in the network.

Embodiment 3 FIG.
The third embodiment will be described with reference to FIGS.
8 to 10, the configuration of the third packet switching device 20 according to the third embodiment is the same as that of the second packet switching device 17.

The third embodiment relates to the operation at the time of a power failure.
When power is not supplied from the external power supply terminal 4 to the third packet switching device 20, that is, during a power failure, the power supply unit 8 connects the second power supply line 15 based on the voltage supplied from the battery unit 9. By using this, power is supplied only to the ring line termination transmission control unit 10 and the ring line termination units 6a and 6b, and the ring line termination units 6a and 6b are initialized. The ring line termination unit 6a and the ring line termination unit 6b are in a state of directly relaying packets between them.
At the time of initialization of the ring line termination units 6a and 6b, the device determination unit 18 determines whether the own device is a master device or an edge device, and the result is determined by the determination signal 19 according to the ring line termination transmission control unit 10. To tell.
When the own apparatus is a master apparatus or an edge apparatus, the ring line termination transmission control 10 makes the transmission stop signal 11 significant and stops the packet relay as shown in FIG.
When the own apparatus is other than the master apparatus or the edge apparatus, the transmission stop signal 11 is ignored and the relay operation by the packet path 23 in FIG. 10 is enabled.

  According to the third embodiment, the third packet switching device can prevent the infinite circulation of the packet by stopping the relay operation of the master device and the edge device in the event of a power failure.

DESCRIPTION OF SYMBOLS 1 1st packet switching apparatus 2 Branch line 3 Ring port 4 External power supply terminal 5 Branch line termination | terminus part 6 Ring line termination | terminus part 7 Packet switching part 8 Power supply part 9 Battery part 10 Ring line termination | terminus transmission control part 11 Transmission stop signal 12 Processor Unit 13 processor bus 14 first power supply line 15 second power supply line 16 terminal device 17 second packet switching device 18 device determination unit 19 determination signal 20 third packet switching device 21 to 23 packet path 30 blocking location

Claims (2)

A packet switching apparatus having a branch port and connected to a ring network through two ring ports and relaying a packet between the ports;
Branch line termination section for terminating the branch port,
Two ring line terminations for terminating the two ring ports,
A ring line termination transmission control unit for controlling transmission of packets from the ring line termination unit to the network;
A packet switching unit that relays packets between the ports;
Configured to supply power input from outside via the external power supply terminal to each of the above parts, and to supply power only to the ring line termination unit and the ring line termination transmission control unit in the event of a power failure when no power is input from the outside Power supply section,
A battery part for supplying power to the power supply part at the time of the power failure ,
When the packet switching device is started immediately after power is supplied from the outside, it is determined whether the packet switching device is a master device that performs blocking to prevent infinite circulation of the packet or an edge device that performs blocking together with the master device. A device determination unit ,
The ring line termination transmission control unit stops transmission of the packet from the ring line termination unit when the determination result by the device determination unit is the master device and the edge device at the time of activation .
A packet switching device characterized in that, when a determination result by the device determination unit is other than the master device and the edge device, a packet is directly relayed between the two ring line termination units. The device determining unit, when the power failure, the packet switching device, so judges whether with a master device or a master device performs a blocking for preventing the endless circulating the packet is an edge device performs the blocking Composed of
The ring line terminal transmission control unit, when the determination result by the device determination unit is the master device or edge device, stops the transmission of packets from the ring line termination unit at the upper Symbol power failure,
2. The packet switching apparatus according to claim 1, wherein when the determination result by the device determination unit is other than the master device or the edge device, the packet is directly relayed between the two ring line termination units.

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