JP5756142B2 - Transfer device and transfer device control method - Google Patents

Description

  The present invention relates to a network communication transfer apparatus and its control.

  An example of a layer 2 frame transfer apparatus related to the present invention will be described in detail with reference to Non-Patent Document 1 and the drawings.

  As shown in Non-Patent Document 1 and FIG. 1, the layer 2 frame transfer device has a plurality of data such as intra-frame data change, addition, deletion, frame filtering, and inter-frame timing adjustment for each logical port. It is constituted by a pipeline circuit 11 in which frame operation functions 21, 22, and 23 are arranged in series. Since the pipeline circuit 11 performs high-speed processing in all the steps, each pipeline operation function can be executed simultaneously on a plurality of frames (32, 33, 34).

Revised 10 Gigabit Ethernet (registered trademark) textbook, Osamu Ishida, Koichiro Seto (supervised), Impress Net Business Company, Inc. (for example, Figure 3-5 Ingress processing flow on page 77)

  For example, as shown in FIG. 2, the pipeline circuit 11 is assumed to have at least one parameter (211, 221, 231) belonging to each frame operation function (21, 22, 23). Here, it is assumed that the parameter 231 of the frame operation function 23 is changed from the value z0 to the value z1 at an arbitrary time. In this case, the changed frame operation function is applied from the frame 32 input to the frame operation function 23 immediately thereafter.

  That is, a technique related to the present invention (hereinafter referred to as a related technique) includes a time for instructing parameter change to the frame operation function 23, a frame 34 input to the pipeline processing circuit 11 immediately after the instruction time, Is difficult to explicitly synchronize. For this reason, it may be applied to frames (32, 33) input at a past time from the frame 34 input to the pipeline processing circuit immediately after the parameter change instruction.

  In the related art, a case is considered where the parameters (211 and 231) in the frame operation functions (21 and 23) are changed at the same time at the same timing as shown in FIG. In this case, the parameter change of the frame operation function (21, 23) is applied to the frame 34, but the parameter change of only the frame operation function 23 is applied to the frame (32, 33), and the frame operation function 21 is not applied. become. For this reason, the pipeline processing circuit 11 may output an unintended and inconsistent frame.

  Such an inconsistent frame can be a cause of malfunction of the L2 network. In addition, when a network administrator or the like wants to change the communication quality caused by the frame operation function after a certain time, it can be a factor of reducing the strictness of communication. These factors may become apparent as the transfer capability of the L2 network increases and the quality required by higher layer applications.

  In order to prevent the generation of such inconsistent frames in the related art, it is necessary to reduce the frequency of frame input so that only one frame exists in the pipeline processing circuit. However, if the frame input frequency is lowered, the processing performance inherent in the circuit cannot be exhibited.

  In other words, the related technology has a difference between the time input to the pipeline processing circuit and the time to reach each frame operation function, and the intention to remain in the pipeline processing circuit when the frame operation function parameters are changed at an arbitrary timing. There is a problem that the changed parameter is applied to the frame that is not set.

  In order to solve the above-described problems, the present invention provides a transfer apparatus and a control method therefor that can prevent a changed parameter from being applied to an unintended frame even if a frame operation function parameter is changed at an arbitrary timing. The purpose is to do.

  In order to achieve the above object, a transfer apparatus and method according to the present invention are provided with a pipeline processing circuit arranged in parallel and a switch shared by their input units.

Specifically, the transfer device according to the present invention has a plurality of pipeline processes that each have the same plurality of frame operation functions, and sequentially perform predetermined frame operations on the input frames with the frame operation functions and output them. Circuit,
A switch for selecting the pipeline processing circuit for inputting a frame to be processed;
A controller for changing parameters belonging to the frame operation function of the pipeline processing circuit and instructing the switch to select the pipeline processing circuit;
Is provided.

The transfer device control method according to the present invention includes a plurality of pipeline processes that each have the same plurality of frame operation functions, and sequentially perform predetermined frame operations on the input frames with the frame operation functions and output them. Circuit,
A switch for selecting the pipeline processing circuit for inputting a frame to be processed;
A transfer device control method comprising:
The parameter belonging to the frame operation function of the pipeline processing circuit is changed and the pipeline processing circuit to be selected is instructed to the switch.

  The pipeline circuit in the present invention connects a plurality of frame operation functions in series. In the transfer apparatus according to the present invention, the same pipeline circuit is arranged in parallel, and the frame is input to one of the pipeline circuits by the switch. That is, the transfer device and the control method thereof according to the present invention have one pipeline circuit as a spare, change parameters belonging to the frame operation function of the spare pipeline circuit in advance, and switch the switch at an arbitrary timing. Switch and control to input the frame into the spare pipeline. There is no frame in the spare pipeline circuit at the time when the parameter belonging to the frame operation function is changed. For this reason, the frame operation function which changed the parameter from the desired frame can be applied by switching the switch at an arbitrary timing.

  Therefore, the present invention can provide a transfer apparatus and a control method thereof that can prevent the changed parameter from being applied to an unintended frame even if the parameter of the frame operation function is changed at an arbitrary timing.

The pipeline processing circuit of the transfer device according to the present invention is more than the number of stream of frames,
The switch is arranged for each frame stream in the same number as the number of frame streams, and at least one pipeline processing circuit can be selected as a common spare for the streams.

In the transfer device control method according to the present invention, the pipeline processing circuit has more than the number of stream of frames,
The switch is arranged for each frame stream in the same number as the number of frame streams,
At least one pipeline processing circuit is selectable as a common spare for the stream.

  When there are a plurality of frame streams, a pipeline circuit used as a spare for the plurality of streams may be shared. When the frequency of parameter change belonging to the frame operation function is low, the cost of the transfer apparatus increases if one spare pipeline circuit is prepared for one stream. If at least one pipeline circuit is used as a common spare for a plurality of streams, the cost of the transfer apparatus can be reduced.

The controller of the transfer device according to the present invention is:
Change a parameter belonging to at least one frame operation function of the currently unselected pipeline processing circuit, and input a frame to be processed to the pipeline processing circuit in which the parameter belonging to the frame operation function is changed at an arbitrary timing The switch is instructed to do so.

  In the transfer device control method according to the present invention, a parameter belonging to at least one frame operation function of the currently unselected pipeline processing circuit is changed, and a parameter belonging to the frame operation function is changed at an arbitrary timing. The switch is instructed to input a frame to be processed to the pipeline processing circuit.

  In the transfer apparatus and the control method thereof according to the present invention, parameters belonging to the frame operation function of the spare pipeline circuit are changed in advance, and the switch is switched at an arbitrary timing to input the frame to the spare pipeline. To control. There is no frame in the spare pipeline circuit at the time when the parameter belonging to the frame operation function is changed. For this reason, the frame operation function which changed the parameter from the desired frame can be applied by switching the switch at an arbitrary timing.

  The present invention can provide a transfer apparatus and a control method thereof that can prevent the changed parameter from being applied to an unintended frame even if the frame operation function parameter is changed at an arbitrary timing.

It is a figure for demonstrating the structural example of related technology. It is a figure for demonstrating the operation example of related technology. It is a figure for demonstrating the operation example of related technology. It is a figure for demonstrating the structure of the transfer apparatus which concerns on this invention. It is a figure for demonstrating operation | movement of the transfer apparatus which concerns on this invention. It is a figure for demonstrating operation | movement of the transfer apparatus which concerns on this invention. It is a figure for demonstrating the structure of the transfer apparatus which concerns on this invention. It is a figure for demonstrating operation | movement of the transfer apparatus which concerns on this invention. It is a figure for demonstrating the Example which applied the transfer apparatus which concerns on this invention to a layer 2 network.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

(Embodiment 1)
FIG. 4 is a diagram illustrating the configuration of the transfer apparatus 301 according to the present embodiment. The transfer device 301
A plurality of pipeline processing circuits (11, 26), each having the same plurality of frame operation functions (21-26), and sequentially performing predetermined frame operations on the input frames with the frame operation functions (21-26). 12)
A switch (51) for selecting a pipeline processing circuit (11, 12) for inputting a frame to be processed;
Is provided.

  The transfer device 301 can connect the shared switch 51 to the input units of the two pipeline processing circuits (11, 12) configured by a plurality of frame operation functions (21 to 26). Each of the frame operation functions 24, 25, 26 belonging to the pipeline processing circuit 12 has the same function as the frame operation functions 21, 22, 23 belonging to the pipeline processing circuit 11. In FIG. 4, the switch 51 is connected to the pipeline processing circuit 11, and all the layer 2 frames (31 to 34) are input to the pipeline processing circuit 11 side.

  FIG. 5 is a diagram for explaining the operation of the transfer apparatus 301. The transfer device 301 changes a parameter belonging to the frame operation function (21 to 26) of the pipeline processing circuit (11, 12), and instructs the switch 51 to select the pipeline processing circuit (11, 12) to be selected. 55 is further provided. The controller 55 changes a parameter belonging to at least one frame operation function of the currently non-selected pipeline processing circuit, and at any timing, processes a frame to be processed by the pipeline processing circuit in which the parameter belonging to the frame operation function is changed. The switch 51 is instructed to input.

  It is assumed that the frame is input to the pipeline processing circuit 11 before the time t0 and the frame operation is applied in the order of the frame operation functions 21, 22, and 23. At this time, the parameters (241, 251, 261) of the frame operation function (24, 25, 26) belonging to the pipeline processing circuit 12 not connected to the switch 51 are set in a freely changeable state. That is, even if the controller 55 changes the parameters (241, 251, 261) of the frame operation function (24, 25, 26) before time t0, there is no frame input to the pipeline processing circuit 12, Nothing is output from the pipeline processing circuit 12. In FIG. 5, the parameters of the frame operation function 21 and the frame operation function 24 and the parameters of the frame operation function 22 and the frame operation function 25 are the same, but the parameters of the frame operation function 23 and the frame operation function 26 are different. That is, FIG. 5 is a scene in which the parameter of the third frame operation function of the pipeline processing circuit is changed from 231 to 261.

  Next, it is assumed that the frame operation based on the changed parameter is applied only to the frame 35 and subsequent frames that are input to the pipeline processing circuit 301 at time t0. The controller 55 switches the switching unit 51 from the pipeline processing circuit 11 to the pipeline processing circuit 12 at time t0. At time t1 after time t0, the frame operation function (24, 25, 26) of the pipeline processing circuit 12 is applied after the (n + 1) th frame 35. That is, after the (n + 1) th frame 35, the third frame operation function that is the parameter 261 is applied.

  FIG. 6 is a diagram for explaining another operation of the transfer device 301. FIG. 6 is a scene in which the parameters of the second and third frame operation functions of the pipeline processing circuit are changed from 221 to 251 from 231 to 261, respectively. As described with reference to FIG. 5, there is no frame in the pipeline circuit 12 when the parameter of the frame operation function of the pipeline circuit 12 is changed. At time t1, the switch 51 switches the frame input destination from the pipeline circuit 11 to the pipeline circuit 12. As a result, the second and third frame operation functions that have become the parameter 251 and the parameter 261 are applied after the (n + 1) th frame 35.

  By performing such switching, an inconsistent frame in which only the frame operation function 26 based on the parameter after the change, which is generated in the case of the related technology described in FIG. 3, is applied and the frame operation 25 is not applied. Can be avoided.

(Embodiment 2)
FIG. 7 is a diagram illustrating the configuration of the transfer apparatus 302 according to the present embodiment. The transfer apparatus 301 of FIG. 4 has a configuration including two pipeline circuits for one frame stream, but the transfer apparatus 302 includes a pipeline circuit and a plurality of frame streams for each of a plurality of frame streams. The configuration has a common spare pipeline circuit. Specifically, the transfer device 302 has more pipeline processing circuits (11 to 13) than the transfer device 301 than the number of frame streams, and the switches (51 and 52) have the same number as the number of frame streams. It is arranged for each stream of frames, and is characterized in that at least one pipeline processing circuit 12 can be selected as a common spare for the stream.

  The transfer device 302 transfers one pipeline processing device 12 among the three pipeline processing circuits (11, 12, 13) to the frames (31 to 35) and the frames (41 to 45) of two different streams. It is designed so that it can be connected to the pipeline processing circuit 12 from the two switches (51, 52) so as to be applicable. Thereby, it is possible to reduce resources of the entire pipeline processing circuit.

  FIG. 8 is a diagram for explaining the operation of the transfer apparatus 302. Assume that the transfer apparatus 302 switches the frame 45 and subsequent frames input to the switch 52 to the pipeline processing circuit 12. Thereafter, when the switching unit 51 performs switching so as to use the pipeline processing circuit 12, frames of different streams are mixed in the pipeline processing circuit 12. For this reason, the protection function 61 is installed between the switch 51 and the pipeline processing circuit 12. The protection function 61 provides a function for preventing connection to the switch 51 until the connection between the switch 52 and the pipeline processing circuit 12 is completed (the switch 52 is connected to the pipeline processing circuit 13 again). To do.

  After switching the switch 52 to the pipeline processing circuit 12, the parameter (271, 281) of the frame operation function (27, 28) belonging to the pipeline processing circuit 13 is changed from, for example, x2 to x0, and from y2 to y1. To do. Then, by returning the connection of the switch 52 from the pipeline processing circuit 12 to the pipeline processing circuit 13, the pipeline processing circuit 12 is opened again. At this time, by releasing the protection function 61, it is possible to return the pipeline processing circuit 12 to a state where it can be used from both the switch 51 and the switch 52.

(Embodiment 3)
FIG. 9 is a diagram for explaining a layer 2 network 71 including the transfer apparatus 301 of FIG.

  In a layer 2 network that performs communication between multipoints, when a part of a network used for communication is constructed, a communication path is switched, and therefore, usually an instantaneous communication interruption is accompanied. Therefore, the administrator of the network will grasp the network usage status and perform the construction at the timing when the impact will be minimal, or obtain the consent of the user in advance and perform the construction at the scheduled timing. .

  The layer 2 network 71 can reduce the work of the network administrator accompanying such construction work. Specifically, the layer 2 network 71 applies the transfer device 301 of FIG. 4 to the transfer devices (72 to 74). The layer 2 network 71 has a redundant configuration. In the transfer devices (72 to 74), the switch 51 in FIG. 4 and the frame operation function (21, 22) with respect to the direction of the transfer devices (75, 76). , 24, 25).

  First, it is assumed that the transfer devices (72 to 74) are communicating via the transfer device 75. The frame operation function (21, 24) in FIG. 4 is a frame storage function, and the frame operation function (22, 25) is a function that distributes the destination path to the transfer devices (75, 76). The frame operation function (23, 26) is arbitrary.

  Thereafter, when construction of the transfer device 75 becomes necessary, it is necessary to switch the communication path so as to pass through the transfer device 76. In advance, in the transfer device (72 to 74), the frame operation function 24 is set to store a certain amount of frames, and the frame operation function 25 is set to distribute to the transfer device 76.

  Then, the switching device 51 of the transfer device (72 to 74) is instructed to switch at an arbitrary timing. The frame remaining in the pipeline circuit 11 at the switching time passes through the transfer device 75. A frame input to the pipeline circuit 12 after the switching time passes through the transfer device 76. The route through the transfer device 75 (transfer device 75 route) and the route through the transfer device 76 (transfer device 76 route) do not necessarily have the same frame propagation time. Here, it is assumed that the propagation time of the transfer device 76 route is shorter than the propagation time of the transfer device 75 route. Here, if the pipeline circuit of the transfer device (72 to 74) does not have a frame storage function, the frame starts to be transmitted along the route of the device 76 when the switch 51 is switched, and the transfer destination is ahead of the frame of the route of the transfer device 75. There is a possibility that the frame order will change when the device arrives. For this reason, since the pipeline circuit of the transfer device (72 to 74) has a frame storage function, it is possible to adjust the frame transmission timing of the route of the transfer device 76 and prevent the frame arrival order from being changed.

  That is, the layer 2 network 71 can prevent the arrival order of the frame of the transfer device 75 route and the frame of the transfer device 76 route from being switched, and as a result, it is possible to prevent communication interruption due to switching. Conversely, when switching from the transfer device 76 route to the transfer device 75 route, it is possible to prevent communication interruption by performing equivalent settings in advance for the frame operation functions (21, 22). .

  The following describes the transfer device of this embodiment.

<Issues>
An object of the present invention is to provide a parameter that belongs to at least one frame operation function (for example, a value change for rewriting a part of a frame, a frame, When the timing adjustment amount between them is changed simultaneously at an arbitrary timing, it is possible to apply the frame operation function only to an input frame after the arbitrary timing to the pipeline processing circuit. That is.

<Solution>
In a layer 2 frame transfer device, when a plurality of parameters belonging to each frame operation function are changed in a pipeline processing circuit in which two or more frame operation functions are connected in series for each logical port, input after an arbitrary timing In order to apply to the frame, the pipeline processing circuits are arranged in parallel, and a switch shared by those input units is arranged to solve the problem.

<Solution>
Specifically, the present invention
(1):
At least one layer 2 frame pipeline processing circuit having the same function is provided in parallel, and a switching device shared by the input unit is provided to apply the frame operation function to an input frame after an arbitrary timing. And a transfer device.
(2):
A method of applying the changed frame operation function only to an input frame after an arbitrary timing when a parameter belonging to the frame operation function is changed by the function described in (1) above; and It is a transfer device.
(3):
When a plurality of parameters belonging to each frame operation function are changed by the function described in (1) above, the plurality of changed frame operation functions are simultaneously applied only to input frames after an arbitrary timing. And a transfer device.

<Effect>
By connecting multiple pipeline processing circuits configured with the same frame operation function in parallel and enabling connection of a shared switch to the input unit, it can be connected to the switch at a time prior to any timing. By changing the parameters belonging to each frame operation function of the pipeline processing circuit that is not, and changing the distribution of the pipeline processing circuit to which the frame is input by the switch at any timing, input after any timing Each frame operation function with the changed parameters from the frame is applied simultaneously.

  And when it applies to the input frame after the arbitrary timings of the parameter which belongs to a plurality of frame operation functions, unintentional application to the frame which remains in a pipeline processing circuit can be prevented.

11, 12, 13: Pipeline processing circuits 21 to 29: Frame operation functions 211 to 291 in the pipeline processing circuit: Parameters 31 to 36 belonging to the frame operation function: Frames and first streams 41 to 46 to which the frames belong: Frame and second stream 51, 52 to which frame belongs: Switch 55: Controller 61: Protection circuit 71: Networks 72 to 76 for illustrating an embodiment of the present invention: Layer 2 transfer apparatus belonging to network 71

Claims (6)

A plurality of pipeline processing circuits each having the same plurality of frame operation functions, sequentially performing a predetermined frame operation on the input frame with the frame operation function and outputting;
A switch for selecting the pipeline processing circuit for inputting a frame to be processed;
A controller for changing parameters belonging to the frame operation function of the pipeline processing circuit and instructing the switch to select the pipeline processing circuit;
A transfer device comprising: The pipeline processing circuit has more than the number of stream of frames,
2. The switch according to claim 1, wherein the switch is arranged for each stream of frames in the same number as the number of stream of frames, and at least one pipeline processing circuit can be selected as a common spare for the streams. The transfer device described in 1. The controller is
Change a parameter belonging to at least one frame operation function of the currently unselected pipeline processing circuit, and input a frame to be processed to the pipeline processing circuit in which the parameter belonging to the frame operation function is changed at an arbitrary timing The transfer device according to claim 1, wherein the switching device is instructed to do so. A plurality of pipeline processing circuits each having the same plurality of frame operation functions, sequentially performing a predetermined frame operation on the input frame with the frame operation function and outputting;
A switch for selecting the pipeline processing circuit for inputting a frame to be processed;
A transfer device control method comprising:
A method for controlling a transfer apparatus, comprising: changing a parameter belonging to the frame operation function of the pipeline processing circuit and instructing the switch to select the pipeline processing circuit to be selected. The pipeline processing circuit has more than the number of stream of frames,
The switch is arranged for each frame stream in the same number as the number of frame streams,
5. The method according to claim 4, wherein at least one pipeline processing circuit is selectable as a common spare for the stream.   Change a parameter belonging to at least one frame operation function of the currently unselected pipeline processing circuit, and input a frame to be processed to the pipeline processing circuit in which the parameter belonging to the frame operation function is changed at an arbitrary timing 6. The transfer device control method according to claim 4, wherein the switching device is instructed to do so.

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