JP3587195B2 - Polishing circuit and polishing method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a communication apparatus using packet communication and an asynchronous transfer mode (hereinafter abbreviated as ATM), and more particularly to a policing method for monitoring and controlling traffic parameters for ensuring communication quality of an ATM network. .
[0002]
[Prior art]
In an ATM communication network, statistical multiplexing is performed based on information source traffic as shown on page 48 of B-ISDN Introduction (Ohm).
[0003]
This means that an ATM communication network suitable for broadband communication accommodates various information sources such as voice, image, and data, and these information sources have a characteristic that the amount of generated information varies with time in traffic. In the conventional circuit-switched network, it is necessary to allocate the bandwidth used in the network at the maximum information generation rate of the information source, whereas in the ATM, the bandwidth used in the network is allocated at the average rate or a speed close to this. This enables effective use of the communication network.
[0004]
In order to perform such statistical multiplexing, the information source declares its traffic characteristics (traffic parameters) to the network side at the time of calling, and the network side calculates the allocated capacity based on this, and as a result, If the call can be accepted, the information source is permitted to communicate.
[0005]
In an ATM communication network, an ATM cell header has a cell loss quality identifier (hereinafter abbreviated as CLP), and a low cell loss rate service (CLP = 0) and a high cell loss rate service (CLP = 1). Two services are provided to enable effective use of the communication network.
[0006]
Furthermore, in Recommendation I-371 (hereinafter abbreviated as I-371) defined by the IT Utility (hereinafter abbreviated as ITU-T), when a cell sent from a user to an ATM network violates a declared traffic parameter, Two operations are defined: a case where the cell is discarded, and a case where communication is permitted by changing the CLP of the cell from 0 to 1 (hereinafter referred to as tagging). When tagging is performed, CLP = 0 The input cell is changed to CLP = 1. As an example of this, as shown in ITU-T Recommendation I-371, section 3.2.3.7, Relationship Between UPC / NPC Actions Cell Loss Priority and Network Performance, the cell rate of the cell is first set to CLP = 0. And if the traffic parameter is violated, tag the violating cell, and then monitor the cell rate of the cell again at CLP = 1 to continue the processing.
[0007]
That is, in the ATM communication network, it is always monitored whether or not the information source transmits information in accordance with the declared traffic during communication, and if the information is violated, the traffic is controlled by tagging or discarding. It must be ensured that the statistical multiplexing is successful. This function is called policing or usage parameter control (hereinafter abbreviated as UPC).
[0008]
[Problems to be solved by the invention]
As described above, if tagging is performed in policing, an ATM communication network with less cell discard can be realized. However, a plurality of monitoring items are provided in accordance with the contents of the communication service, and the monitoring result determination order is defined. (That is, a plurality of traffic parameters have a dependency on a monitoring item and an order.) For example, ATM Forum Working Draft ATM User Network Interface Specification Version 2.2 June 21 1993 Appendix B Conformance Exemplars in a Traffic Contract As shown in FIG. 16, the frame relay service initially monitors the peak rate of the cell independently of the CLP, and if there is no violation in the traffic parameters, the average rate of the cell after branching to CLP = 0 and 1 To monitor. Here, if CLP = 0 and there is a cell average rate violation, tagging is performed at CLP = 1 to monitor the average rate.
[0009]
To realize such a communication service, a method of sequentially monitoring a plurality of dependent traffic parameters is simple. For example, when a communication service having a dependency relationship as shown in FIG. 24 is realized, it can be realized by connecting monitoring processing units corresponding to respective traffic parameters in series as shown in FIG. However, since processing is performed in series, a cell delay increases when a communication service is realized. In particular, in an actual apparatus, as shown in FIG. 26, since the processing time of the monitoring processing units A, B, and C is longer than the processing time of the final determination unit D, specifically, the monitoring processing unit requires arithmetic processing and the like. Since the processing time is long and the configuration is complicated, an increase in the delay becomes a problem as the dependency of the traffic parameter becomes more complicated. In addition, a buffer memory or the like for holding cells is required during processing by each monitoring processing unit. That is, as a method for economically realizing a high-speed communication service such as an ATM communication network, a method of sequentially monitoring a plurality of traffic parameters is not optimal.
[0010]
That is, an object of the present invention is to provide a policing method and a circuit for realizing a communication service in which an increase in cell delay is reduced and an amount of hardware is small and a plurality of traffic parameters have a dependency in an ATM communication network. It is in.
[0011]
Further, as described in the above-mentioned ATM Forum Working Draft, monitoring items and dependencies of individual policings differ depending on the ATM communication service to which the cell belongs. For example, in the fixed bit rate service, only the peak cell rate of CLP = 0 needs to be policed when the cell policing circuit is input. However, in the frame relay service, as described above, the CLP is not required when the cell policing circuit is input. First, all cells belonging to the connection are monitored at the peak cell rate, and violating cells are discarded. In the cells not discarded by the monitoring, when the policing circuit is input, the cells with CLP = 0 are monitored at the average cell rate of CLP = 0, and the violating cells are tagged. At the time of input to the policing circuit and the cell tagged in this monitoring, policing is performed at the average cell rate of CLP = 1 for the cell that does not violate the monitoring of the peak cell rate at CLP = 1.
[0012]
That is, in the ATM communication, it is required to change the number of monitoring items and the dependency between monitoring items according to various services. However, realizing all of them by changing the physical connection of the monitoring circuit leads to an increase in the amount of hardware.
[0013]
Accordingly, a second object of the present invention is to provide an ATM device which provides a multi-service capable of supporting various ATM communication services by simply changing the number of monitoring items and the dependency between monitoring items without increasing the amount of hardware. An object of the present invention is to provide a policing method and a circuit which can be realized by the above.
[0014]
[Means for Solving the Problems]
In the policing of an ATM communication device that provides various ATM communication services, a plurality of monitoring portions corresponding to a plurality of monitoring items are installed in parallel regardless of a dependency in accordance with an item of the communication service, and the ATM communication is independently performed. It monitors the traffic of the cell input to the device, and makes a determination based on the monitoring result obtained in parallel and the CLP of the input cell according to a determination rule defined corresponding to the communication service. A comprehensive judgment part consisting of a judgment part and an update part for updating the current traffic state, which is a traffic monitoring parameter according to the judgment result, is installed independently of the plurality of monitoring parts. To collectively process the input cells, determine whether to process the input cells as they are, tag them, or discard them, and update the traffic state. It was the ring system.
[0015]
The policing circuit that implements the policing method changes a monitoring circuit that monitors only an input cell of an ATM communication device for whether or not a traffic parameter (current traffic state) violates declared traffic for each communication service. A monitoring circuit unit provided as many as possible (parallel installation, independent operation) corresponding to the number of monitoring items, and corresponding to the plurality of monitoring circuits, respectively, are specified corresponding to a communication service by inputting a monitoring result and a CLP. A plurality of decision circuits cascaded in accordance with a decision rule, that is, whether to tag or discard an input cell when a traffic violation occurs for each CLP value, in accordance with a dependency on a monitoring item and an order; Traffic parameters (current traffic conditions) based on the determination results. It was constructed by comprehensive determination unit consisting updating section cascaded similarly multiple update circuits.
[0016]
Furthermore, in the policing circuit, each monitoring circuit, determination circuit and update circuit are provided and connected in advance by the same number of circuits corresponding to the number of policing items that fluctuate for each communication service, and correspond to various communication services. By simply setting items required for the monitored / determined / updated operation in each circuit, a dependency relation between the monitored items and the order is set, and operation parameters that can execute policing corresponding to the communication service are determined and stored in the parameter storage means. On the other hand, an operation parameter corresponding to the communication service is selected from the storage means and set in each circuit. That is, each circuit has the same circuit configuration, and is a circuit that selectively sets and sets an operation parameter necessary for policing from the storage unit and performs monitoring, determination, and update operations corresponding to a communication service. It should be noted that a dummy operation parameter is defined so that the previously installed circuit which is unused when the number of items of polishing is small does not malfunction, and this parameter is set to an unused circuit.
[Action]
The operation required for policing is independent of the monitoring unit, the judgment unit, and the updating unit.The monitoring unit is configured to monitor multiple traffic monitoring items corresponding to the communication service independently and in parallel. Despite the dependence on the determination order, the monitoring execution time does not increase depending on the number of items, that is, monitoring processing in a short time can be realized. Further, since it is not necessary to hold the input cells until the monitoring of all items is completed, holding means such as a buffer memory can be reduced, and policing can be realized with an economical configuration.
[0017]
Since the judgment unit and the update unit are configured to perform the processing collectively, independent of the traffic monitoring, which has a long processing time and a complicated configuration such as an arithmetic processing, whether the input cell is to be processed as it is, tagged or discarded. Policing for determining and updating the traffic state can be easily realized in a short time with only a simple operation logic. In addition, the processing of the dependency on the monitoring items and the order in accordance with the communication service only requires changing the configuration of the determination unit and the update unit, so that policing that can support various communication services can be easily realized. it can.
[0018]
Furthermore, since each monitoring circuit, determination circuit and update circuit of the policing circuit are provided in advance and connected in a number corresponding to the number of items of various policing items, the same circuit is simple, and the circuit configuration is simple. Etc. can be realized economically and easily. In addition, each circuit only needs to select and set the operation parameters required for the monitoring, judgment, and updating operations corresponding to the communication service, and the monitoring item and the order of the dependency are set so that policing corresponding to the communication service can be performed. Therefore, a policing circuit suitable for an LSI that can support various communication services can be realized without changing the connection or adding hardware of the circuit.
[0019]
Since the operation parameters are stored in the storage means, the parameters are selected in accordance with the communication service and set in each circuit, the same policing circuit can be used in a communication device which provides various communication services, so that the service can be supported. A simple and economical ATM communication device that can execute various policing operations only by changing the settings can be realized. Further, even if the contents of policing are changed or the contents of policing are added due to the addition of services, it is possible to easily cope with the rewriting or additional writing of the operation parameters which are the contents of the storage means. A suitable ATM communication device can be realized. In other words, not only policing according to various ATM communication services as described in the above-mentioned ATM Forum Working Draft, but also an economical service that can easily cope with newly generated ATM communication services without changing hardware. A policing method and a policing circuit having a flexible configuration and an ATM communication device can be realized.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 shows an embodiment of an ATM communication apparatus using the policing method and circuit of the present invention. The ATM communication apparatus includes an interface unit 60 (hereinafter abbreviated as INF) for connecting a user and a communication network in an ATM communication network, and policing for arriving cells connected to the INF 60 in accordance with various communication services. The circuit 10 holds the declared value of the allowable traffic amount of the ATM connection to which the arriving cell necessary for policing belongs, and the traffic state of the current ATM connection and the traffic parameters such as the traffic monitoring items and the monitoring judgment order corresponding to the communication service. A traffic parameter table 40 is provided.
[0022]
The policing circuit 10 includes a plurality of traffic monitoring circuits 11 for monitoring whether or not there is a violation in the traffic of the arriving cell from the traffic parameter extraction point 64 of the INF 60 through the input line 22 for each traffic monitoring item corresponding to the communication service. The CLP 21 included in the header of the arriving cell input from the output of the monitoring circuit 11 and the CLP extraction point 63 of the INF 60 determines the state of the cell after traffic monitoring, and tags the cell to be transmitted to the ATM communication network. Alternatively, it is composed of a comprehensive judgment circuit 13 for determining whether to discard. Here, each monitoring circuit 11 monitors whether the arriving cell violates the declared value of the traffic parameter based on the allowable traffic amount of the cell and the current traffic state to which the cell belongs read from the table 40 via the signal line 51. Then, the monitoring result 12 is output. More specifically, it is described in “ATM network traffic management method using deterministic UPC” (Transactions of the Institute of Electronics, Information and Communication Engineers, B-1, Vol. J76B-1, No. 3, p253-263, 1993. 3). Such a leaky bucket method, a T-X method, a dangerous bridge method and the like were used. In addition, the comprehensive judgment circuit 13 checks the input CLP 21 and the monitoring result 12 of the monitoring circuit 11 and the traffic monitoring items and the monitoring judgment order (hereinafter referred to as the monitoring state item 139) corresponding to the communication service read from the table 40 via the signal line 53. And sends a signal 30 of the determination result to the cell passing determination point 61 of the INF 60 connected to the policing circuit 10, and determines whether to update the traffic parameters (current traffic state) in the table 40. Is determined, and when the traffic parameter is rewritten, the traffic parameter in the traffic parameter table 40 is rewritten on the bus 52 via the selector 15. In this embodiment, the table 40 is an external circuit of the polishing circuit 10, but may be provided inside the polishing circuit 10 as shown in FIG.
[0023]
The policing is completed by the INF 60 tagging or discarding the arriving cell in accordance with the signal 30 at the cell passing judgment point 61, changing the header of the cell by the header conversion 62, and sending the cell to the ATM communication network.
[0024]
3 and 4 show the detailed configuration of the policing circuit 10 shown in the embodiment of FIG. 1. FIG. 3 shows the monitoring circuit 11 corresponding to the contents of the communication service provided by the ATM communication network. FIG. 4 shows an example of the configuration of the policing circuit 10 in which three monitoring circuits 11 are provided in parallel. Needless to say, the policing method and circuit of the present invention are such that a plurality of monitoring circuits 11 are installed in parallel according to the contents of the communication service, and a plurality of monitoring circuits 11 are installed in parallel other than those shown in this embodiment. It may be done. In the following description, the operation will be described in detail using an embodiment of the polishing circuit provided with the three monitoring circuits 11 shown in FIG.
[0025]
In the policing circuit 10 shown in FIG. 3, a traffic monitoring circuit 11 monitors traffic parameters of an ATM connection to which an arriving cell belongs. The traffic monitoring circuit 11 sends to the overall judgment circuit 13 the monitoring result 12 as to whether or not there is a violation in the allowable traffic of the ATM connection to which the cell belongs. The comprehensive judgment circuit 13 indicates a CLP instruction for sending the cell into the network based on the header information 21, the monitoring result 12, and the monitoring state item 139, a CLP signal 31 indicating whether the cell is to be tagged or discarded, and a tagging signal. 32, a discard signal 33 is sent to the cell passing judgment point 61 of the host device 60, and an output line 14 sends to the selector 15 whether or not the traffic parameter (current traffic state) of each traffic monitoring circuit 11 is updated. When updating the traffic parameters, the traffic parameters after the traffic monitoring from the traffic monitoring circuit 11 is written from the data line 52 to the traffic parameter table. When the traffic parameters are not updated, the read traffic parameters themselves are written from the data line 52 to the traffic parameter table 40. Alternatively, no write operation is performed. That is, processing is performed so that the cell has not arrived.
[0026]
FIG. 5 shows the configuration of the comprehensive judgment circuit 13 when three traffic monitoring circuits 11 are used, and is divided into a judgment circuit 131 and an update circuit 138. A plurality of determination circuits 131 and update circuits 138 are provided corresponding to the plurality of traffic monitoring circuits 11, respectively.
[0027]
More specifically, the determination circuit 131a inputs the traffic monitoring result 12a output from the traffic monitoring circuit 11a and the CLP 21 included in the header of the arrival cell, and checks the monitoring status item 139 (specifically, The monitoring CLP 139 (X) which is an identifier indicating whether the CLP 21 to be monitored shown in FIG. 6 performs the determination when CLP = 0, performs the determination when CLP = 1, or performs the determination in both cases, and FIG. The discard / tagging identifier 139 (Y), which is an identifier indicating whether the input cell is discarded or tagged based on the result of the judgment shown in (1), the internal update signal 137a, the internal CLP 134a, the internal tagging signal 132a, The internal discard signal 133a is sent to the update circuit 138a and another determination circuit 131. Further, the determination circuit 131b obtains the internal update signal 137b from the monitoring result 12b of the traffic monitoring circuit 11b, the internal CLP 134a sent from the determination circuit 131a, the monitoring CLP 139 (X) of the monitoring status item 139, and the discard / tagging identifier 139 (Y). , The internal CLP 134b, the internal tagging signal 132b, and the internal discard signal 133b to the update circuit 138b and other determination circuits 131. Further, in the determination circuit 131c, the internal update signal 137c is obtained from the monitoring result 12c of the traffic monitoring circuit 11c, the internal CLP 134b sent from the determination circuit 131b, the monitoring CLP 139 (X) of the monitoring status item 139, and the discard / tagging identifier 139 (Y). , The output CLP 31, the internal tagging signal 132c and the internal discard signal 133c to the update circuit 138c. In the above description, the internal update signals 137a, b, and c are the judgment results of the judgment circuits 131a, b, and c, the input CLP (21, 134) of the main judgment circuit 131 and the output CLP (31, 134) of the main judgment circuit 131. Is a condition signal indicating that the traffic parameter is updated when there is no change (as a result of the determination that the traffic is normal). Further, the internal tagging signals 132a, 132b, and 132c are all sent to the internal tagging signal OR 135, where they become the tagging signal 32, and are sent to all the update circuits 138 and the cell passage determination points 61 of the host device 60, and are internally discarded. All of the signals 133a, b, and c are sent to the internal discard signal OR 136, where they become the discard signal 33, and are sent to all the update circuits 138 and the host device 60 to the cell passage determination point 61. The update circuits 138a, 138b, and 138c output the internal update signals 137a, 137b, and 137c sent from the determination circuits 131a, 131b, and 131c, and the tagging signal 32 and the internal discard signal 136 sent from the internal tagging signal OR 135. With the transmitted discard signal 33 as an input, update signals 14a, 14b and 14c for instructing updating of traffic parameters (current traffic state) are transmitted to the traffic parameter table 40 for each of the update circuits 138a, 13b and 13c.
[0028]
FIG. 13 shows the details of the determination by the above-described determination circuit 131. Each of the determination circuits corresponds to one of the determinations shown in FIG. The pattern is set. Hereinafter, the content of the determination will be described. In this figure, the number at the beginning of the figure name indicates the value of the CLP to be monitored. That is, 0 (T1) 13111 to 0 (D2) 13114 is a target for determination of traffic having an input CLP (21, 134) of 0, and 1 (T) 13115 to 1 (D2) 13117 is an input CLP (21, 134). Indicates that traffic of 1 is to be determined, and that 0 + 1 (T1) 13118 to 0 + 1 (D) 1311A determines traffic regardless of the value of the input CLP (21, 134). In addition, T in parentheses indicates that tagging is performed by determination, and D indicates discarding.
(1) 0 (T1) 13111:
The determination is performed when the input CLP (21, 134) is 0. If there is no violation in the traffic, 0 is output as the output CLP (31, 134). At this time, the traffic monitoring circuit 11 sends an internal update signal 137 to notify the update of the traffic parameter to the update circuit 138. If the result of the monitoring is violation traffic, tagging is performed with the output CLP (31, 134) set to 1. At this time, the internal tagging signal 132 indicates that the cell has been tagged. If the input CLP (21, 134) is 1, the output CLP (31, 134) outputs 1 regardless of the value of the monitoring result 12.
(2) 0 (T2) 13112:
The determination is performed when the input CLP (21, 134) is 0, and the operation is the same as that of 0 (T1) 13111. However, if the input CLP (21, 134) is 1, the cell is discarded regardless of the value of the monitoring result 12, and the internal discard signal 133 indicates that the cell has been discarded.
(3) 0 (D1) 13113:
The determination is performed when the input CLP (21, 134) is 0. If there is no violation in the traffic, 0 is output as the output CLP (31, 134). At this time, the traffic monitoring circuit 11 sends out the internal update signal 137 and transmits it to the update circuit 138. However, if the result of the monitoring is a violation, 1 is output to the output CLP (31, 134) and the cell is discarded. At this time, the internal discard signal 133 indicates that the cell has been discarded. When the input CLP (21, 134) is 1, the output CLP (31, 134) outputs 1 regardless of the value of the monitoring result 12.
(4) 0 (D2) 13114:
The determination is performed when the input CLP (21, 134) is 0, and the operation is the same as that of 0 (D1) 13113. However, if the input CLP (21, 134) is 1, the cell is discarded regardless of the value of the monitoring result 12, and the internal discard signal 133 informs that the cell is discarded.
[0029]
(5) 1 (T) 13115:
The present invention is a dummy determination circuit that outputs an input CLP (21, 134) as an output CLP (31, 134) irrespective of the value of the input CLP (21, 134) or the monitoring result 12, that is, performs no determination. When providing various communication services to be described later, the policing circuit is used for adjusting the number of judging circuits installed in accordance with the contents of the services.
(6) 1 (D1) 13116:
The judgment is performed when the input CLP (21, 134) is 1. If the input CLP (21, 134) is 0, 0 is set to the output CLP (31, 134) regardless of the value of the monitoring result 12. Output. When the input CLP (21, 134) is 1, if there is no violation in the traffic, 1 is output as the output CLP (31, 134), and the traffic monitoring circuit 11 sends out the internal update signal 137 and transmits it to the update circuit 138. However, if the result of the monitoring is a violation, the cell is discarded. At this time, the internal discard signal 133 indicates that the cell has been discarded.
(7) 1 (D2) 13117:
When the input CLP (21, 134) is 1, the determination is performed. When the input CLP (21, 134) is 0, 1 is output to the output CLP (31, 134) regardless of the value of the monitoring result 12. And discard the cell. At this time, the internal discard signal 133 indicates that the cell has been discarded. The operation when the input CLP (21, 134) is 1 is the same as that of 1 (D1) 13116.
(8) 0 + 1 (T1) 13118:
The determination is performed regardless of the value of the input CLP (21, 134). If there is no violation in the traffic, the value of the input CLP (21, 134) is output as the output CLP (31, 134). If the result of monitoring is a violation, if the input CLP (21, 134) is 0, 1 is output to the output CLP (31, 134) and tagging is performed. At this time, the internal tagging signal 132 indicates that the cell has been tagged. When the input CLP (21, 134) is 1, 1 is output to the output CLP (31, 134), and the internal update signal 137 is transmitted to the update circuit 138.
(9) 0 + 1 (T2) 13119:
If the input CLP (21, 134) is 0 and there is no traffic violation, the output CLP (31, 134) outputs 0. However, if the result of the monitoring is a violation, 1 is output to the output CLP (31, 134) and tagging is performed. At this time, the internal tagging signal 132 indicates that the cell has been tagged. Also, regardless of the monitoring result 12, the internal update signal 137 is transmitted and transmitted to the update circuit 138. On the other hand, when the input CLP (21, 134) is 1, if there is no traffic violation, the output CLP (31, 134) outputs 0. At this time, the traffic monitoring circuit 11 sends out the internal update signal 137 and transmits it to the update circuit 138. However, if the result of the monitoring is a violation, 1 is output to the output CLP (31, 134) and the cell is discarded. At this time, the internal discard signal 133 indicates that the cell has been discarded.
(10) 0 + 1 (D) 1311A:
If the input CLP (21, 134) is 0 and there is no traffic violation, the output CLP (31, 134) outputs 0. At this time, the traffic monitoring circuit 11 sends out the internal update signal 137 and transmits it to the update circuit 138. However, if the result of the monitoring is a violation, the cell is discarded. At this time, the internal discard signal 132 indicates that the cell has been discarded. On the other hand, when the input CLP (21, 134) is 1, the same operation as 0 + 1 (T2) 13119 is performed.
Specifically, in response to the communication service, whether the CLP 21 to be monitored shown in FIG. 6 makes a determination when CLP = 0, makes a determination when CLP = 1, or makes a determination in either case The discard / tagging identifier 139 (Y), which is an identifier indicating whether the input cell should be discarded or tagged, is determined based on the monitoring CLP 139 (X) which is the identifier shown and the result of the determination shown in FIG. One of the patterns is selected and set in each determination circuit.
[0030]
FIG. 6 shows details of the monitoring CLP 139 (X) which is the monitoring status item 139. For the monitoring CLP 139 (X), 0: 139 (X1) indicating that the determination is performed when CLP = 0, 1: 139 (X2) indicating that the determination is performed when CLP = 1, or both of the determinations are performed. There are three states of 0 + 1: 139 (X3), which are coded with two bits (C1: 139 (3), C0: 139 (2)) to distinguish between these. FIG. 7 shows details of the discard / tagging identifier 139 (Y) of the monitoring status item 139. The discard / tagging identifier 139 (Y) indicates that tagging is performed, T1: 139 (Y1) and T2: 139 (Y2) and four states D1: 139 (Y3) and D2: 139 (Y4) indicating discarding. Two bits (DT1: 139 (1 ), DT0: 139 (0)).
[0031]
FIGS. 8 and 9 are diagrams showing, in a truth table, the decision logic for realizing the decision circuit, and show the respective operation logics for the decision type 1311 shown in FIG. The input CLP (21, 134), the monitoring result 12 (UPC violation), the monitoring CLP state 1391 of FIG. 6 and the discard / tagging state 1392 of FIG. 7 are input signals, the output CLP (21, 134), the internal tagging signal. 132, an internal discard signal 133, and an internal update signal 137 as output signals. More specifically, in the policing circuit according to the present invention, when providing various communication services, a judgment circuit corresponding to the contents of the service is selected from the truth table (the state 1391 of the monitoring CLP in FIG. 6 and the judgment circuit in FIG. 7). A discard / tagging state 1392 is designated), and the input CLP (21, 134) and the monitoring result 12 (UPC violation) are determined as input signals. In this embodiment, the state of the monitoring CLP in FIG. 6 and the state of discarding / tagging in FIG. 7, and the input CLP (21, 134) and the monitoring result 12 (UPC violation) are indicated by the address and the truth table in FIGS. The determination circuit 131 is realized by a memory having a configuration in which the output is used as data. With such a configuration, even if a new communication service is generated and a new determination pattern is required, a policing circuit capable of responding to the communication service by simply rewriting or appending the contents of the memory becomes a hardware. It can be easily realized without adding. Of course, a method may be used in which this memory is installed in a common part of the device, and only a part of the truth table necessary for the determination corresponding to the communication service is set in the determination circuit. Further, even if the logic operation is realized by hardware or a microcomputer and firmware using a gate circuit or F / F, any logic that can realize the logical operation of the determination shown in FIGS.
[0032]
FIGS. 10, 11 and 12 are diagrams showing, using a truth table, logic for implementing an update circuit for instructing the update of the traffic parameter (current traffic state) in accordance with the determination result, as shown in FIG. 3 shows an operation logic for instructing whether or not to update the traffic monitoring parameter in the traffic parameter table 40 as a result of the determination circuit performing the determination. In the policing circuit according to the present invention, when providing various communication services, a judgment circuit corresponding to the contents of the service is selected from the truth table (the monitoring CLP state 1391 in FIG. 6 and the discard / tagging state 1392 in FIG. 7). ), The internal update signal 137, the tagging signal 32, and the discard signal 33 are used as input signals, and the update signal 14 is output. For example, when the monitoring CLP 139 (X) is 0: 139 (X1), the tagging signal 33 and the discard signal 34 are not transmitted from the logical sum 135 of the internal tagging signal 132 and the logical sum 136 of the internal discard signal 133. At this time, that is, when there is no UPC violation, the update circuit 138 sends an update signal 14 for updating traffic monitoring parameters. When the monitoring CLP 139 (X) is 1: 139 (X2) or 0 + 1: 139 (X3), and the discard signal 34 is not transmitted from the OR 136 of the internal discard signal, the update circuit 138 transmits the traffic monitoring parameter. An update signal 14 to be updated is transmitted. In the present embodiment, the state of the monitoring CLP in FIG. 6 and the state of discard / tagging in FIG. 7 and the output of the determination circuit shown in the truth table of FIGS. The updating circuit 138 is realized by a memory. Of course, a method may be used in which this memory is installed in a common part of the device, and only a part of the truth table necessary for the determination corresponding to the communication service is set in the determination circuit. Further, even if it is realized by hardware using a gate circuit or F / F, or a microcomputer and firmware, any logic that can realize the logical operation of the determination shown in FIGS. 10 to 12 may be used. Note that the determination logic of the above-described determination circuit may be included in this memory.
[0033]
According to the comprehensive determination circuit 13 in which the determination circuit 131 and the update circuit 138 are connected as described above, even if the traffic monitoring circuit 11 performs the parallel operation of three UPCs, the comprehensive determination circuit 13 can associate a plurality of monitoring items. Since the monitoring can be performed, it is possible to perform processing as if a plurality of monitors were executed in order. That is, a policing circuit that performs policing corresponding to a communication service in which a plurality of traffic parameters have a dependency relationship can be easily realized.
[0034]
Hereinafter, an embodiment in which the policing method and circuit according to the present invention are applied to various communication services shown in the ATM forum will be described in detail.
[0035]
Specifically, three examples of switched multi-megabit data services, frame relay services, fixed bit rate services, and LAN-to-LAN connections within the ATM Forum Traffic Management Baseline Text Exen Apple of Rules-Specified In Traffic Contract 1 shows an embodiment of the policing circuit 10 realized by the traffic monitoring circuit 11, three decision circuits 131, and three update circuits 138.
[0036]
<Example 1>
FIG. 14 is a diagram showing patterns of traffic monitoring items and monitoring status items 139 to be monitored in the switched multi-megabit data service (hereinafter abbreviated as SMDS). In order to execute the policing of the SMDS, the monitoring state item 139 of the SMDS is selected in the comprehensive judgment circuit 13 from the judgment type 1311 set in the traffic parameter table 40 and set in the judgment circuit 131. Specifically, as shown in FIG. 15, three judgment types 1311 are selected to configure the comprehensive judgment circuit 13.
[0037]
That is, in the SMDS, a traffic parameter for a peak cell rate of CLP = 0 is set in the traffic parameter table 40 in the traffic monitoring circuit 11a, and the traffic parameter is monitored. The monitoring circuit 11b sets a traffic parameter for an average rate of CLP = 0 in the traffic parameter table 40, and monitors the traffic parameter. In this service, only two items, the peak cell rate of CLP = 0 and the average rate, need to be monitored. That is, since the monitoring circuit 11c is not used, any traffic parameter may be set in the traffic parameter table 40. Of course, you do not need to set anything. Each of the traffic monitoring circuits 11a, b, and c does not depend on each other, and when the cell arrives at the host device 60 and the policing circuit 10 recognizes the arrival of the cell, the three traffic monitoring circuits 11a, b, and c operate in parallel. Only monitor whether there is a violation in each traffic parameter.
[0038]
Each of the traffic monitoring circuits 11a, b, and c is connected to a determination circuit 131a, b, and c. In the judgment circuits 131a, 131b, and 131c, one of the judgment types 1311 shown in FIG. 13 is selected and set according to the monitoring state item 139 of the SMDS set in the traffic parameters. The policing dependency is determined by the combination of the determination circuits 131a, 131b and 131c, and the policing of the SMDS service is realized.
[0039]
The determination circuit 131a connected to the traffic monitoring circuit 11a sends an internal discard signal 133 when the traffic monitoring circuit 11a has a violation (peak cell rate violation) for the cell with the input CLP = 0, and outputs the cell with the input CLP = 1. , The pattern 0 (D2) 13114 for transmitting the internal discard signal 133 is used. The decision circuit 131a uses the CLP of the arriving cell as the input CLP 21, makes a decision according to the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the judgment circuit 131a becomes the input CLP 134a of the judgment circuit 131b.
[0040]
The determination circuit 131b connected to the traffic monitoring circuit 11b sends an internal discard signal 133 when the traffic monitoring circuit 11b has a violation (average rate violation) with respect to the cell having the input CLP = 0, and outputs the internal discard signal 133 for the cell having the input CLP = 1. Uses pattern 0 (D2) 13114 for transmitting the internal discard signal 133. The decision circuit 131b uses the output CLP 134a of the decision circuit 131a as the input CLP 134a, makes a decision by the decision logic shown in FIGS. 8 and 9, and outputs the output CLP 134b. The CLP 134b sent out by the judgment circuit 131b becomes the input CLP 134b of the judgment circuit 131c.
[0041]
As with the monitoring circuit, this service can be realized by using two determination circuits. Therefore, the determination circuit 131c connected to the traffic monitoring circuit 11c has a function of providing a cell having an input CLP = 0 regardless of the result of the traffic monitoring circuit 11c. A cell is transmitted as it is with CLP = 0, and a dummy pattern 1 (T) 13115 is used for transmitting a cell with CLP = 1 as it is regardless of the result of the traffic monitoring circuit 11c also for a cell with input CLP = 1. The determination circuit 131c uses the output CLP 134b of the determination circuit 131b as the input CLP 134b, operates according to the logic shown in FIGS. 8 and 9, and outputs the output CLP 134c. The logical sum of the CLP sent from the judging circuit 131c and the CLP sent from the other judging circuits is obtained, and becomes the output CLP 31 from the policing circuit 10.
[0042]
The decision circuit 131a sends an internal discard signal 133a corresponding to the decision pattern one-to-one (that is, if there is a violation in the traffic monitoring circuit 11a for the cell with the input CLP = 0, and outputs the internal discard signal for the cell with the input CLP = 1). An update circuit 138a (for pattern 0 (D2) 13114) for sending the discard signal 133a is connected. The update circuit 138a operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137a is transmitted from the determination circuit 131a and neither tagging nor discarding is performed in other policing, the traffic monitoring circuit 11a An update signal 14a for updating the traffic parameter for use.
[0043]
Similarly, the decision circuit 131b sends the internal discard signal 133b when the traffic monitoring circuit 11b violates the cell with the input CLP = 0, and sends the internal discard signal 133b immediately for the cell with the input CLP = 1. The update circuit 138b corresponding to 0 (D2) 13114 is connected. The update circuit 138b operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137b is transmitted from the determination circuit 131b and neither tagging nor discarding is performed in another policing, the traffic monitoring circuit 11b An update signal 14b for updating the traffic parameter for use.
[0044]
The update circuit 138c corresponding to the dummy pattern 1 (T) 13115 of the determination circuit is connected to the determination circuit 131c. This update circuit 138c also operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137c is transmitted from the determination circuit 138c and is not discarded in other policing, the update circuit 138c is used for the traffic monitoring circuit 11c. An update signal 14c for updating traffic parameters is sent.
[0045]
<Example 2>
FIG. 16 is a diagram showing patterns of monitoring items and monitoring status items 139 monitored in a frame relay service (hereinafter abbreviated as FRS). In order to execute FRS policing, the monitoring state item 139 of the FRS is selected from the judgment type 1311 preset in the traffic parameter table 40 and set in the judgment circuit 131 in the comprehensive judgment circuit 13. More specifically, the comprehensive determination circuit 13 is configured by selecting the determination type 1311 as shown in FIG.
[0046]
That is, in the FRS, the traffic monitoring circuit 11a sets the traffic parameters for the peak cell rates of all cells in the traffic parameter table 40 regardless of the value of the CLP, and monitors the traffic parameters. The traffic monitoring circuit 11b sets a traffic parameter for the average rate of CLP = 0 in the traffic parameter table 40 and monitors the traffic parameter. Further, the traffic monitoring circuit 11c sets a traffic parameter for an average rate of CLP = 1 in the traffic parameter table 40 and monitors the traffic parameter. As in the first embodiment, each of the traffic monitoring circuits 11a, b, and c has no dependency on each other, and when the cell arrives at the host device 60 and the policing circuit 10 recognizes the arrival of the cell, the three traffic monitoring circuits 11a, 11b , C operate in parallel and only monitor for violations in each traffic parameter.
[0047]
Each of the traffic monitoring circuits 11a, b, and c is connected to a determination circuit 131a, b, and c. The monitoring state item 139 of the FRS set in the traffic parameter sets the determination type 1311 shown in FIG. One of them is selected and set. Policing of the FRS service is realized by the combination of the determination circuits 131a, 131b, and 131c.
[0048]
The determination circuit 131a connected to the traffic monitoring circuit 11a has a pattern 0 + 1 (D) for transmitting the internal discard signal 133 when there is a violation (peak cell rate violation) in all the input cells regardless of the value of CLP in the traffic monitoring circuit 11a. ) 1311A is used. The decision circuit 131a uses the CLP of the arriving cell as the input CLP 21, makes a decision according to the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the judgment circuit 131a becomes the input CLP 134a of the judgment circuit 131b.
[0049]
The determination circuit 131b connected to the traffic monitoring circuit 11b sends an internal tagging signal 132 when a violation (average rate violation) occurs in the cell with the input CLP = 0 in the cell with the input CLP = 0, and outputs Uses the pattern 0 (T1) 13111 for transmitting CLP = 1 as it is. The decision circuit 131b uses the output CLP 134a of the decision circuit 131a as the input CLP 134a, makes a decision by the decision logic shown in FIGS. 8 and 9, and outputs the output CLP 134b. The CLP 134b sent out by the judgment circuit 131b becomes the input CLP 134b of the judgment circuit 131c.
[0050]
The judgment circuit 131c connected to the traffic monitoring circuit 11c transmits CLP = 0 as it is in the cell with the input CLP = 0, and there is a violation (average rate violation) in the traffic monitoring circuit 11c in the cell with the input CLP = 1. And a pattern 1 (D1) 13116 for transmitting the internal discard signal 133 using the determination circuit 131c. The decision circuit 131c uses the output CLP 134b of the decision circuit 131b as the input CLP 134b, makes a decision by the decision logic shown in FIGS. 8 and 9, and outputs the output CLP31. The CLP sent from the judgment circuit 131c and the CLP sent from the other judgment circuits are ORed, and become the output CLP 31 from the policing circuit 10.
[0051]
The decision circuit 131a has a one-to-one correspondence with the decision pattern (that is, the pattern 0 + 1 (D) 1311A for transmitting the internal discard signal 133a when all traffic is ignored by the traffic monitoring circuit 11a regardless of the CLP. ) Update circuit 138a is connected. The update circuit 138a operates according to the logic shown in FIGS. 10, 11 and 12, and is used for the traffic monitoring circuit 11a when the internal update signal 137a is transmitted from the determination circuit 131a and the cell is not discarded in other policing. An update signal 14a for updating the traffic parameter is transmitted.
[0052]
Similarly, the determination circuit 131b sends an internal tagging signal 132b to the cell with CLP = 0 when there is a violation in the traffic monitoring circuit 11b, and sends the CLP = 1 to the cell with CLP = 1 in a pattern 0 (T1). The update circuit 138b corresponding to 13111 is connected. The update circuit 138b operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137b is transmitted from the determination circuit 131b and neither tagging nor discarding is performed in another policing, the traffic monitoring circuit 11b An update signal 14b for updating the traffic parameter for use.
[0053]
Similarly, a pattern 0 (CLP = 0) is sent to the judgment circuit 131c for the cell with the input CLP = 0, and the internal discard signal 133c is sent when the traffic monitoring circuit 11c violates the cell with the input CLP = 1. D1) The update circuit 138c corresponding to 13116 is connected. The update circuit 138c operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137c is transmitted from the determination circuit 138c and neither tagging nor discarding is performed in other policing, the traffic monitoring circuit 11c An update signal 14c for updating the traffic parameter for use.
[0054]
<Example 3>
FIG. 18 is a diagram showing patterns of monitoring items and monitoring status items 139 in a fixed bit rate service (hereinafter abbreviated as CBR). In order to execute the CBR policing, the CBR monitoring state item 139 is selected from the judgment type 1311 preset in the traffic parameter table 40 and set in the judgment circuit 131 in the comprehensive judgment circuit 13. Specifically, as shown in FIG. 19, the judgment type 1311 is selected to configure the comprehensive judgment circuit 13.
[0055]
That is, in the CBR, it is assumed that a traffic parameter for a peak cell rate of CLP = 0 is set in the traffic parameter table 40 in the traffic monitoring circuit 11a, and the traffic parameter is monitored. In the present service, only one monitoring item of the peak cell rate of CLP = 0 is required. That is, since the traffic monitoring circuit 11b and the traffic monitoring circuit 11c are not used, any traffic can be selected similarly to the traffic monitoring circuit 11c of the first embodiment. The parameters may be set in the traffic parameter table 40. Each traffic monitoring circuit 11 does not depend on each other, and when a cell arrives at the host device 60 and is recognized by the policing circuit 10, the three traffic monitoring circuits 11 operate in parallel to determine whether there is a violation in each traffic parameter. Is the same as in the first and second embodiments.
[0056]
Each of the traffic monitoring circuits 11a, b, and c is connected to a determination circuit 131a, b, and c, respectively. In the determination circuits 131a, 131b, and 131c, one of the determination types 1311 shown in FIG. 13 is selected and set according to the CBR monitoring status item 139 set in the traffic parameters. Policing of the CBR service is realized by the combination of the determination circuits 131a, 131b, and 131c.
[0057]
The determination circuit 131a connected to the traffic monitoring circuit 11a sends an internal discard signal 133 when the traffic monitoring circuit 11a has a violation (peak cell rate violation) for the cell with the input CLP = 0, and outputs the cell with the input CLP = 1. , The pattern 0 (D2) 13114 for transmitting the internal discard signal 133 is used. The decision circuit 131a uses the CLP of the arriving cell as the input CLP 21, makes a decision according to the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the judgment circuit 131a becomes the input CLP 134a of the judgment circuit 131b.
[0058]
As with the monitoring circuit, this service can be realized if there is one determination circuit. Therefore, the input CLP = 0 is input to the determination circuit 131b connected to the traffic monitoring circuit 11b and the determination circuit 131c connected to the traffic monitoring circuit 11c. The dummy pattern 1 (CLP = 0) is transmitted to the cell of the input CLP = 1 regardless of the result of the traffic monitoring circuit, and the cell of the CLP = 1 is transmitted to the cell of the input CLP = 1 regardless of the result of the traffic monitoring circuit 11. T) 13115 is used. These determination circuits 131 operate with the logic shown in FIGS. 8 and 9 and output the output CLP 134. The CLP sent from each of the decision circuits 131a, 131b, 131c is ORed and becomes the output CLP 31 from the policing circuit 10.
[0059]
The decision circuit 131a sends an internal discard signal 133a corresponding to the decision pattern (that is, if there is a violation in the traffic monitoring circuit 11a for the cell with the input CLP = 0, and immediately sends the internal discard signal for the cell with the input CLP = 1. An update circuit 138a (for pattern 0 (D2) 13114) that sends out 133a is connected. The update circuit 138a operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137a is transmitted from the determination circuit 131a and neither tagging nor discarding is performed in other policing, the traffic monitoring circuit 11a An update signal 14a for updating the traffic parameter for use.
[0060]
Similarly, update circuits 138b and 138c corresponding to the dummy pattern 1 (T) 13115 are connected to the determination circuits 131b and c, respectively. The update circuit 138 operates according to the logic shown in FIGS. 10, 11, and 12, and is used for the traffic monitoring circuit 11 when the internal update signal 137 is transmitted from the determination circuit 131 and is not tagged or discarded in other policing. An update signal 14 for updating the traffic parameters of the above is transmitted.
[0061]
<Example 4>
FIG. 20 is a diagram showing patterns of monitoring items and monitoring status items 139 in the LAN connection service. In order to execute policing of the LAN connection service, the monitoring state item 139 of the LAN connection is selected in the comprehensive determination circuit 13 from the determination type 1311 set in the traffic parameter 40 in advance and set in the determination circuit 131. Specifically, as shown in FIG. 21, the judgment type 1311 is selected to configure the comprehensive judgment circuit 13.
[0062]
That is, in the LAN connection service, a traffic parameter for a peak cell rate of CLP = 0 is set in the traffic parameter table 40 in the traffic monitoring circuit 11a, and the traffic parameter is monitored. Further, the traffic monitoring circuit 11b sets a traffic parameter for an average rate of CLP = 0 in the traffic parameter table 40 and monitors the traffic parameter. Further, the traffic monitoring circuit 11c sets a traffic parameter for an average rate of CLP = 1 in the traffic parameter table 40 and monitors the traffic parameter. As in the above embodiment, each of the traffic monitoring circuits 11a, 11b, and 11c has no dependency on each other, and when the cell arrives at the host device 60 and the policing circuit 10 recognizes the arrival of the cell, the three traffic monitoring circuits 11a, 11a, b and c operate in parallel and only monitor each traffic parameter for violations.
[0063]
Each of the traffic monitoring circuits 11a, b, and c is connected to a determination circuit 131a, b, and c. In the determination circuits 131a, 131b, and 131c, one of the determination types 1311 shown in FIG. 13 is selected and set according to the monitoring status item 139 of the LAN connection service set in the traffic parameters. Policing of the service between LANs is realized by the combination of the determination circuits 131a, 131b, and 131c.
[0064]
The determination circuit 131a connected to the traffic monitoring circuit 11a sends an internal discard signal 133 when the traffic monitoring circuit 11a has a violation (peak cell rate violation) for the cell with the input CLP = 0, and outputs the cell with the input CLP = 1. , The pattern 0 (D2) 13114 for immediately transmitting the internal discard signal 133 is used. The decision circuit 131a uses the CLP of the arriving cell as the input CLP 21, makes a decision according to the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the judgment circuit 131a becomes the input CLP 134a of the judgment circuit 131b.
[0065]
The determination circuit 131b connected to the traffic monitoring circuit 11b sends an internal tagging signal 132 when a violation (average rate violation) occurs in the cell with the input CLP = 0 and the cell with the input CLP = 1 with respect to the cell with the input CLP = 0. Uses the pattern 0 (T1) 13111 for transmitting CLP = 1 as it is. The decision circuit 131b uses the output CLP 134a of the decision circuit 131a as the input CLP 134a, makes a decision by the decision logic shown in FIGS. 8 and 9, and outputs the output CLP 134b. The CLP 134b sent out by the judgment circuit 131b becomes the input CLP 134b of the judgment circuit 131c.
[0066]
The judgment circuit 131c connected to the traffic monitoring circuit 11c sends CLP = 0 as it is for the cell with the input CLP = 0, and there is a violation (average rate violation) in the traffic monitoring circuit 11c for the cell with the input CLP = 1. And a pattern 1 (D1) 13116 for transmitting the internal discard signal 133. The decision circuit 131c uses the output CLP 134b of the decision circuit 131b as the input CLP 134b, makes a decision by the decision logic shown in FIGS. 8 and 9, and outputs the output CLP 134c. The logical sum of the CLP sent from the judging circuit 131c and the CLP sent from another judging circuit is obtained, and the result is the output CLP 31 from the policing circuit 10.
[0067]
The decision circuit 131a has a one-to-one correspondence with the decision pattern (that is, if there is a violation in the traffic monitoring circuit 11a for the cell with the input CLP = 0, the internal discard signal 133a is sent out. An update circuit 138a (for the determination pattern 0 (D2) 13114) that immediately sends the internal discard signal 133a is connected. The update circuit 138a operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137a is transmitted from the determination circuit 131a and neither tagging nor discarding is performed in other policing, the traffic monitoring circuit 11a An update signal 14a for updating the traffic parameter for use.
[0068]
Similarly, the decision circuit 131b sends an internal tagging signal 132b to the cell with the input CLP = 0 when there is a violation in the traffic monitoring circuit 11b, and sends the CLP = 1 as it is to the cell with the input CLP = 1. The update circuit 138b corresponding to (T1) 1311 is connected. The update circuit 138b operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137b is transmitted from the determination circuit 131b and neither tagging nor discarding is performed in another policing, the traffic monitoring circuit 11b An update signal 14b for updating the traffic parameter for use.
[0069]
Similarly, the decision circuit 131c sends CLP = 0 directly to the cell with the input CLP = 0, and sends the internal discard signal 133c to the cell with the input CLP = 1 if there is a violation in the traffic monitoring circuit 11c. (D1) Update circuit 138c corresponding to 13116 is connected. The update circuit 138c operates according to the logic shown in FIGS. 10, 11, and 12. When the internal update signal 137c is transmitted from the determination circuit 138c and is not discarded in other policing, the traffic for the traffic monitoring circuit 11c is used. An update signal 14c for updating a parameter is transmitted.
[0070]
<Example 5>
In the above-described four embodiments, three traffic monitoring circuits, three determination circuits, and three update circuits are prepared, and monitoring items and determination patterns corresponding to communication services are selected and set in these circuits. It has been shown that a policing circuit corresponding to a communication service can be realized even with the same circuit configuration. Depending on the contents of the communication service, more traffic monitoring circuits, judgment circuits and update circuits may be required. However, according to the present invention, a sufficient number of traffic monitoring circuits, judgment circuits, and updating circuits (for example, the maximum number of circuits that can be assumed in advance) are prepared in advance in the policing circuit as in the following embodiment. In a service using a small number of circuits, a dummy pattern is set as in the above embodiment, so that it is possible to easily cope with various communication services. Of course, since these dummy circuits operate in parallel except for a part of the determination operation, the processing operation of the circuit in the communication service does not increase and the delay time does not pose a problem. Hereinafter, an embodiment of the policing circuit when the variable bit rate service is realized by the four traffic monitoring circuits 11, the four determination circuits 131, and the four updating circuits 138 will be described.
[0071]
FIG. 22 is a diagram showing patterns of monitoring items and monitoring status items 139 in a variable bit rate service (hereinafter abbreviated as VBR). In order to execute the VBR policing, the VBR monitoring state item 139 is selected from the judgment type 1311 preset in the traffic parameter 40 and set in the judgment circuit 131 in the comprehensive judgment circuit 13. Specifically, as shown in FIG. 23, the judgment type 1311 is selected to configure the comprehensive judgment circuit 13.
[0072]
That is, in the VBR, four monitoring circuits monitor the peak cell rate and average rate of the cell arriving at CLP = 0 and the peak cell rate and average rate of the cell arriving at CLP = 1. The setting method of the monitoring item is the same as in the above-described embodiment. Cells arriving at CLP = 0 determine the peak cell rate violation under the condition of CLP = 0 by the first-stage determination circuit, and permitted cells are averaged under the same condition of CLP = 0 by the second-stage determination circuit. Determine rate violations. Among cells arriving at CLP = 0, cells determined to be violated by the first or second stage are tagged. The cell tagged at the first or second stage and the cell arriving at CLP = 1 are determined to have a peak cell rate violation and an average rate violation by the third or fourth determination circuit, respectively. If there is a violation here, the cell is discarded. Specifically, in FIG. 4, the policing circuit 10 monitors the peak cell rate of the cell arriving at CLP = 0 at the first monitoring item in the traffic monitoring circuit 11a in FIG. The monitoring circuit 11b monitors the average rate of cells arriving at CLP = 0, the third monitoring item monitors the peak cell rate of cells arriving at CLP = 1 by the traffic monitoring circuit 11c, and the fourth monitoring item For the item, the traffic monitoring circuit 11d monitors the average rate of cells arriving at CLP = 1. These monitoring results 12 are input to the comprehensive judgment circuit 13. The comprehensive judgment circuit 13 selects 0 (T1) 13111 as the judgment circuit 131a, 0 (T1) 13111 as the judgment circuit 131b, 1 (D1) 13116 as the judgment circuit 131c, and 1 (D1) 13116 as the judgment circuit 131d, and makes each judgment. This is a policing circuit used for setting the circuit.
[0073]
【The invention's effect】
As described above, according to the policing method and circuit of the present invention, in the policing in which there are a plurality of monitoring items for realizing various communication services and the order of these determinations is defined, FIG. As shown in FIG. 28, a plurality of traffic monitoring circuits are provided independently, and a general determination circuit is provided in which a determination circuit having a determination order and an update circuit are separated from and combined with the monitoring circuit. Even in complicated policing (for example, policing with N monitoring items), traffic monitoring that requires a long processing time can be performed in parallel. Therefore, as shown in FIG. 29, the policing process is the same as policing with one monitoring item. And the policing with a small cell delay suitable for high-speed broadband communication becomes possible. Furthermore, a sufficient number of monitoring circuits, judgment circuits, and update circuits required for policing are installed in advance, and operation is performed by setting necessary parameters for each circuit in accordance with a communication service. A policing circuit that provides multi-service economically without the need for additional circuit by hardware can be easily realized.
[Brief description of the drawings]
FIG. 1 is a diagram showing one configuration of a polishing circuit of the present invention.
FIG. 2 is a diagram showing another configuration of the polishing circuit of the present invention.
FIG. 3 is a configuration diagram of a policing circuit using three traffic monitoring circuits.
FIG. 4 is a configuration diagram of a policing circuit using four traffic monitoring circuits.
FIG. 5 is a configuration diagram of a comprehensive judgment circuit of the polishing circuit shown in FIG. 3;
FIG. 6 is a diagram showing a detailed status of a monitoring CLP identifier.
FIG. 7 is a diagram showing a detailed state of a discard / tagging identifier.
FIG. 8 is a diagram (1/2) illustrating a truth table indicating a logical operation of the determination circuit;
FIG. 9 is a diagram (2/2) showing a truth table indicating a logical operation of the determination circuit;
FIG. 10 is a diagram (1/3) showing a truth table indicating a logical operation of the update circuit;
FIG. 11 is a diagram (2/3) showing a truth table indicating a logical operation of the update circuit;
FIG. 12 is a diagram (3/3) showing a truth table indicating a logical operation of the update circuit;
FIG. 13 is a diagram illustrating a determination type (pattern) performed by a determination circuit 131;
FIG. 14 is a diagram showing monitoring status items of the switched multi-megabit service.
FIG. 15 is a connection diagram of a switched multi-megabit service determination circuit.
FIG. 16 is a diagram showing monitoring status items of a frame relay service.
FIG. 17 is a connection diagram of a frame relay service determination circuit.
FIG. 18 is a diagram showing monitoring status items of a constant bit rate service.
FIG. 19 is a connection diagram of a fixed bit rate service determination circuit.
FIG. 20 is a diagram showing monitoring status items of LAN connection.
FIG. 21 is a connection diagram of a determination circuit for connection between LANs.
FIG. 22 is a diagram showing monitoring status items of a variable bit rate service.
FIG. 23 is a connection diagram of a variable bit rate service determination circuit.
FIG. 24 is a diagram showing a dependency of a monitoring status item in a communication service.
FIG. 25 is a general configuration diagram of a policing circuit having a dependency on a monitoring state item.
FIG. 26 is an operation sequence diagram of the polishing circuit of FIG. 25;
FIG. 27 is a diagram showing the dependency of monitoring status items according to the policing method of the present invention.
FIG. 28 is a configuration diagram of a circuit for realizing the polishing method of the present invention.
FIG. 29 is an operation sequence diagram of the polishing circuit of FIG. 28;
[Explanation of symbols]
1 ATM communication device 60 interface circuit
10: policing circuit, 11: traffic monitoring circuit,
12: monitoring result, 13: comprehensive judgment circuit,
14 ... update signal, 21 ... CLP,
40 ... traffic parameter table,
131: determination circuit; 138: traffic parameter update circuit.

Claims (6)

A policing circuit used in an asynchronous transfer mode network,
Input means for inputting information on traffic included in the input cell and a result of monitoring a plurality of traffics of the input cell in parallel;
Judging means for judging whether to tag or discard the input cell or to permit input based on information from the input means and a cell processing rule prescribed for a communication service provided by the asynchronous transfer mode network. A polishing circuit characterized by the following. A policing circuit used in an asynchronous transfer mode network,
Input means for inputting information about traffic included in the input cell and information from a plurality of monitoring circuits that monitor the traffic of the input cell in parallel for each item;
The plurality of monitoring circuits determine whether the input cell is to be tagged, discarded, or permitted to input based on information from the input means and a cell processing rule defined for a communication service provided by the asynchronous transfer mode network. A policing circuit comprising: a determination unit having a plurality of corresponding determination circuits. A policing circuit used in an asynchronous transfer mode network,
Input means for inputting information about traffic included in the input cell and information from a plurality of monitoring circuits that monitor the traffic of the input cell in parallel for each item;
The plurality of monitoring circuits determine whether the input cell is to be tagged, discarded, or permitted to input based on information from the input means and a cell processing rule defined for a communication service provided by the asynchronous transfer mode network. Storage means for holding a state of traffic of the input cell and a determination means having a plurality of corresponding determination circuits,
A policing circuit comprising: updating means provided with a plurality of updating circuits corresponding to the plurality of monitoring circuits for updating the contents of the storage means based on the output of the determining means. A policing circuit used in an asynchronous transfer mode network,
Input means for inputting information about traffic included in the input cell and information from a plurality of monitoring circuits that monitor the traffic of the input cell in parallel for each item;
Determining means comprising a plurality of determining circuits corresponding to the plurality of monitoring circuits,
Storage means for holding a state of traffic of the input cell,
Update means provided with a plurality of update circuits for updating the contents of the storage means based on the output of the determination means,
The determining means determines whether to tag, discard, or permit input of the input cell based on information from the input means and a cell processing rule defined for a communication service provided by the asynchronous transfer mode network. A policing circuit, wherein an updating means updates a traffic state of the storage means. A method of policing cells in an asynchronous transfer mode network, comprising:
Monitor the traffic of input cells in parallel,
Tagging, discarding, or permitting input of the input cell based on information on traffic contained in the input cell, the plurality of monitoring results, and a cell processing rule defined for a communication service provided by an asynchronous transfer mode network. And decide
A policing method, wherein the input cell is processed based on the determination result. A method of policing cells in an asynchronous transfer mode network, comprising:
Monitoring the traffic of the input cell in parallel for each of a plurality of monitoring items based on a cell processing rule defined for the communication service provided by the asynchronous transfer mode network;
It is determined whether the input cell is tagged or discarded or input permitted based on the information on the traffic included in the input cell, the plurality of monitoring results, and the cell processing rule,
A policing method, wherein the input cell is processed based on the determination result.

Images