JP3653501B2 - ATM communication equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a communication apparatus using packet communication and asynchronous transfer mode (hereinafter referred to as ATM), and more particularly, to a policing method for monitoring and controlling traffic parameters for ensuring the communication quality of an ATM network. .
[0002]
[Prior art]
In the ATM communication network, as shown in page 48 of B-ISDN Introduction (Ohm), statistical multiplexing based on information source traffic is performed.
[0003]
This is because the ATM communication network suitable for broadband communication accommodates various information sources such as voice, images, data, etc., and these information sources have the property that the amount of generated information varies with time. In conventional circuit-switched networks, it is necessary to allocate the bandwidth used in the network at the maximum information generation rate of the information source, whereas in ATM, the bandwidth used in the network is allocated at an average rate or a rate close to this. The network can be used effectively.
[0004]
In order to perform such statistical multiplexing, the information source declares its traffic characteristics (traffic parameters) to the network side when making a call, 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 allowed to communicate.
[0005]
In addition, an ATM communication network has a cell loss quality identifier (hereinafter abbreviated as CLP) in an ATM cell header, 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 eye-371 (hereinafter abbreviated as I-371) defined by ITU (hereinafter abbreviated as ITU-T), when a cell sent from the user to the ATM network violates the traffic parameter declared, Two operations are defined: discarding the cell and changing the CLP of the cell from 0 to 1 to allow communication (hereinafter referred to as tagging). When tagging is performed, CLP = 0. The entered cell is changed to CLP = 1. As an example of this, as shown in the 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. If the traffic parameter is violated, the violating cell is tagged, and then the cell rate of the cell is monitored again with CLP = 1 to continue the process.
[0007]
That is, in the ATM communication network, it is always monitored whether or not the information source is sending information according to the declared traffic during communication, and if there is a violation, by controlling the traffic such as 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]
If tagging is performed in policing as described above, an ATM communication network with less cell discard can be realized, but there are a plurality of monitoring items according to the contents of the communication service, and the order of determination of monitoring results is defined. (That is, multiple traffic parameters have dependencies on monitoring items and order.) For example, ATM Forum Working Draft ATM User Network Interface Specification Version 2.2 June 21 1993 Appendix B Conformance Examples in a Traffic Contract As shown in FIG. 16, the frame relay service described in FIG. 16 first monitors the cell peak rate regardless of the CLP, and if there is no violation of the traffic parameter, the cell average rate after branching to CLP = 0 and 1 To monitor. Here, if there is a violation of the average rate of the cell with CLP = 0, the average rate is monitored by tagging to CLP = 1.
[0009]
In order to realize such a communication service, a method for sequentially monitoring a plurality of traffic parameters having dependency relationships is simple. For example, when realizing a communication service having a dependency as shown in FIG. 24, it can be realized by connecting monitoring processing units corresponding to each traffic parameter in series as shown in FIG. However, since processing is performed in series, cell delay increases when a communication service is realized. In particular, in the actual apparatus, the processing time of the monitoring processing units A, B, and C is longer than the processing time of the final determination unit D as shown in FIG. Since the processing time is large and complicated, the delay increases as the dependency of traffic parameters becomes more complicated. In addition, a buffer memory or the like for holding cells is required while processing is performed by each monitoring processing unit. In other words, as a method for economically realizing an apparatus that performs high-speed communication services 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 circuit for realizing a communication service in which an increase in cell delay is reduced and a plurality of traffic parameters depend on each other with a small amount of hardware in an ATM communication network. It is in.
[0011]
Further, as described in the above-mentioned ATM Forum Working Draft, the monitoring items and dependency of each policing differ depending on the ATM communication service to which the cell belongs. For example, in the fixed bit rate service, it is only necessary to police the peak cell rate of CLP = 0 when the cell policing circuit is input. In the frame relay service, as described above, the CLP is not limited when the cell policing circuit is input. First, all cells belonging to the connection are monitored at the peak cell rate, and violation cells are discarded. In a cell that is not discarded in this monitoring, when a policing circuit is input, a cell with CLP = 0 is monitored at an average cell rate of CLP = 0 and a violation cell is tagged. When cells that are tagged in this monitoring and a policing circuit are input, policing is performed at an average cell rate of CLP = 1 for cells that do not violate peak cell rate monitoring with CLP = 1.
[0012]
That is, in the ATM communication, it is required to change the number of monitoring items and the dependency relationship between the monitoring items according to various services. However, realizing all of this by changing the physical connection of the monitoring circuit leads to an increase in the amount of hardware.
[0013]
Therefore, the second object of the present invention is to change the number of monitoring items and the dependency relationship between the monitoring items without increasing the amount of hardware in an ATM device that provides a multi-service capable of supporting various ATM communication services. It is an object of the present invention to provide a policing method and circuit that can be realized by the above.
[0014]
[Means for Solving the Problems]
In the policing of ATM communication devices that provide various ATM communication services, a plurality of monitoring parts corresponding to a plurality of monitoring items according to the items of the communication service are installed in parallel regardless of the dependency relationship, and the ATM communication is independently performed. The traffic of the cell input to the device is monitored, and based on the monitoring result obtained in parallel and the CLP of the input cell, the determination is made according to the determination rule defined for the communication service. A comprehensive judgment part consisting of an update part for updating the current traffic state, which is a traffic monitoring parameter according to the judgment part and the judgment result, is installed independently of the plurality of monitoring parts, and here, the dependency relationship between the monitoring items and the order To determine whether to process the input cell as is, tagging or discarding, and update the traffic state. It was the ring system.
[0015]
The policing circuit that realizes the policing method varies for each communication service, with respect to an input cell of the ATM communication apparatus, a monitoring circuit that monitors only whether or not the traffic parameter (current traffic state) violates the declared traffic. Specified according to the communication service by inputting the monitoring result and CLP respectively corresponding to the monitoring circuit unit provided in parallel with the number of monitoring items (parallel installation, independent operation) and the plurality of monitoring circuits. A plurality of determination circuits that are determined based on a determination rule, that is, whether an input cell is tagged or discarded when a traffic violation occurs for each CLP value, and a plurality of determination circuits that are cascade-connected according to a dependency relationship between monitoring items and order The traffic parameters (current traffic status) are updated based on the judgment 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 connected in advance by providing the same number of circuits that can correspond to the number of items of policing that varies for each communication service, and corresponding to various communication services. By simply setting the necessary items for the monitoring, judgment, and update operations in each circuit, the operation parameters that can be used for policing corresponding to the communication service are determined and stored in the parameter storage means. On the other hand, the 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 a circuit that performs monitoring / determination / update operation corresponding to a communication service by selecting and setting operation parameters necessary for policing from the storage means. A dummy operation parameter is also defined so that the previously installed circuit that is unused when the number of items of policing is small does not malfunction, and this parameter is set to an unused circuit.
[Action]
Since the monitoring unit, the determination unit, and the updating unit are made independent of the operations necessary for policing, and the monitoring unit is configured to monitor a plurality of traffic monitoring items corresponding to the communication service independently and in parallel, the policing itself includes the monitoring items. In spite of the dependency relationship regarding the determination order, the monitoring execution time does not increase depending on the number of items, that is, a monitoring process in a short time can be realized. Further, since it is not necessary to hold the input cell until 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 determination unit and the update unit are configured to process collectively, whether to process the input cell as it is, tagging or discarding it independently of traffic monitoring, which has a long and complicated processing time such as arithmetic processing Policing for determining and updating the traffic state can be easily realized in a short time with only simple operation logic. In addition, the dependency processing for monitoring items and order corresponding to 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 is easily realized. it can.
[0018]
In addition, each monitoring circuit, decision circuit, and update circuit of the policing circuit are configured by connecting in advance the same number of circuits that can handle various policing items. Etc. and can be realized economically and easily. In addition, each circuit has a configuration in which policing corresponding to a communication service can be performed by selecting and setting operation parameters necessary for monitoring / judgment / updating operations corresponding to the communication service and setting the dependency relationship between the monitoring items and the order. Therefore, it is possible to realize a policing circuit suitable for LSI implementation that can cope with various communication services without changing hardware such as circuit connection change or addition.
[0019]
Since the operation parameters are stored in the storage means, and the parameters are selected and set in each circuit corresponding to the communication service, the same policing circuit can be used in the communication device that provides various communication services, and the service is supported. Thus, it is possible to realize an easy and economical ATM communication apparatus capable of executing various policings simply by changing the setting. In addition, even if policing content changes or policing content additions occur due to service addition, the configuration can easily cope with rewriting or appending of operation parameters, which are the contents of storage means, to provide various communication services A suitable ATM communication apparatus 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 economically compatible with newly generated ATM communication services without hardware changes. A policing system and a policing circuit having a flexible configuration and an ATM communication apparatus can be realized.
[0020]
【Example】
Embodiments of the present invention will be described below 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 device includes an interface unit 60 (hereinafter abbreviated as INF) for connecting the user side and the communication network in the ATM communication network, and policing for performing policing corresponding to various communication services on the arriving cell connected to the INF 60. The circuit 10 holds the traffic allowance of the ATM connection to which the arrival cell necessary for policing belongs, the traffic status of the current ATM connection, the traffic monitoring item corresponding to the communication service, and the traffic parameters such as the monitoring judgment order. Traffic parameter table 40.
[0022]
The policing circuit 10 parallels a plurality of traffic monitoring circuits 11 for monitoring whether there is a violation in the traffic of the arrival cell from the traffic parameter extraction point 64 of the INF 60 for each traffic monitoring item corresponding to the communication service. And tagging a cell to be sent to the ATM communication network by determining the state after the traffic monitoring of the cell by the CLP 21 included in the header of the arrival cell input from the output of the monitoring circuit 11 and the CLP extraction point 63 of the INF 60 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 according to the traffic allowable amount to which the cell belongs read from the table 40 via the signal line 51 and the current traffic state. Then, the monitoring result 12 is output. More specifically, it is described in “ATM Network Traffic Management Method by Deterministic UPC” (Electronic Information and Communication Society Journal, B-1, Vol. J76B-1, No. 3, p253-263, 19933.3). The leaky bucket method, the tee method, the dangerous bridge method, and the like. The comprehensive judgment circuit 13 also includes a traffic monitoring item corresponding to a communication service read from the input CLP 21 and the monitoring result 12 of the monitoring circuit 11 and the table 40 via the signal line 53 and a monitoring judgment order (hereinafter referred to as a monitoring status item 139 and Whether to update the traffic parameter (current traffic state) in the table 40, as well as sending the determination result signal 30 to the cell passage decision point 61 of the INF 60 connected to the policing circuit 10. When the traffic parameters are rewritten, the traffic parameters in the traffic parameter table 40 are rewritten by the bus 52 via the selector 15. Although the table 40 is an external circuit of the polishing circuit 10 in this embodiment, it may be provided inside the polishing circuit 10 as shown in FIG.
[0023]
Policing is completed by the INF 60 by tagging or discarding the arrival cell in accordance with the signal 30 at the cell passage decision point 61, changing the cell header by the header conversion 62, and sending it 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 a configuration example of the policing circuit 10 in which three monitoring circuits 11 are arranged in parallel. Of course, in the policing method and circuit of the present invention, a plurality of monitoring circuits 11 are installed in parallel corresponding to the contents of the communication service, and the number of monitoring circuits 11 other than those shown in this embodiment are installed in parallel. What you did is fine. In the following description, the operation will be described in detail using an example of a polishing circuit provided with the three monitoring circuits 11 shown in FIG.
[0025]
In the policing circuit 10 shown in FIG. 3, the traffic monitoring circuit 11 monitors the traffic parameters of the ATM connection to which the arrived cell belongs. The traffic monitoring circuit 11 sends the monitoring result 12 to the general determination circuit 13 as to whether there is a violation in the traffic allowable amount of the ATM connection to which the cell belongs. Based on the header information 21, the monitoring result 12, and the monitoring status item 139, the comprehensive judgment circuit 13 receives a CLP instruction for sending the cell into the network and whether the cell is tagged or discarded. 32, the discard signal 33 is sent to the cell passage decision point 61 of the host device 60, and the output line 14 sends to the selector 15 whether or not the traffic parameters (current traffic state) of each traffic monitoring circuit 11 are updated. When updating the traffic parameter, the traffic parameter after the traffic monitoring is executed from the traffic monitoring circuit 11 is written from the data line 52 to the traffic parameter table. When the traffic parameter is not updated, the read traffic parameter itself is written from the data line 52 to the traffic parameter table 40. Or, 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 total judgment circuit 13 when three traffic monitoring circuits 11 are used. The total judgment circuit 13 is divided into a judgment circuit 131 and an update circuit 138. A plurality of determination circuits 131 and update circuits 138 are installed corresponding to the plurality of traffic monitoring circuits 11.
[0027]
A specific configuration will be described. In the determination circuit 131a, the traffic monitoring result 12a output from the traffic monitoring circuit 11a and the CLP 21 included in the header of the arrival cell are input, and the monitoring status item 139 (specifically, The monitoring CLP 139 (X), which is an identifier indicating whether the determination is performed when the CLP 21 to be monitored illustrated in FIG. 6 is CLP = 0, whether the determination is performed when CLP = 1, or both is performed, and FIG. Is determined by the discard / tagging identifier 139 (Y), which is an identifier indicating whether the input cell is to be discarded or to be tagged, based on the determination result shown in (1), and the internal update signal 137a, the internal CLP 134a, the internal tagging signal 132a, and The internal discard signal 133a is sent to the update circuit 138a and other determination circuits 131. The determination circuit 131b also receives 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) and the discard / tagging identifier 139 (Y) of the monitoring state item 139. The internal CLP 134b, the internal tagging signal 132b, and the internal discard signal 133b are sent 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) and the discard / tagging identifier 139 (Y) of the monitoring state item 139. The output CLP 31, the internal tagging signal 132c, and the internal discard signal 133c are sent to the update circuit 138c. In the above description, the internal update signals 137a, b, c are the judgment results of the judgment circuits 131a, b, c, the input CLP (21, 134) of the judgment circuit 131 and the output CLP (31, 134) of the judgment circuit 131. Is a condition signal indicating that the traffic parameter is updated when there is no change in the traffic (when the traffic is normal as a result of the determination). The internal tagging signals 132a, b, and c are all sent to the internal tagging signal logical sum 135, where they become the tagging signal 32, sent to all the update circuits 138 and the cell passage decision points 61 of the host device 60, and internally discarded. The signals 133a, b, and c are all sent to the internal discard signal logical sum 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, b, c are based on the internal update signals 137a, b, c sent from the determination circuits 131a, b, c, the tagging signal 32 sent from the internal tagging signal logical sum 135, and the internal discard signal logical sum 136. With the discard signal 33 to be transmitted as an input, update signals 14a, b, c for instructing update of the traffic parameters (current traffic state) are transmitted to the traffic parameter table 40 for each of the update circuits 138a, b, c.
[0028]
FIG. 13 shows details of the determination by the determination circuit 131 described above, and each determination circuit has one of the determinations shown in this figure corresponding to the contents of various communication services to be described in detail later. The pattern is set. Hereinafter, the determination content will be described. In this figure, the number at the beginning of the figure name indicates the CLP value to be monitored. In other words, 0 (T1) 13111 to 0 (D2) 13114 are subject to determination of traffic whose input CLP (21, 134) is 0, and 1 (T) 13115 to 1 (D2) 13117 are input CLP (21, 134). Indicates that the traffic of 0 + 1 (T1) 13118 to 0 + 1 (D) 1311A is determined without taking the value of the input CLP (21, 134). In addition, T in parentheses indicates tagging by determination, and D indicates discarding.
(1) 0 (T1) 13111:
The determination is made when the input CLP (21, 134) is 0. If there is no violation in traffic, 0 is output as the output CLP (31, 134). At this time, the traffic monitoring circuit 11 transmits an internal update signal 137 to notify the update circuit 138 of the update of the traffic parameters. If the monitoring result is violation traffic, the output CLP (31, 134) is tagged as 1. At this time, the internal tagging signal 132 informs 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 made when the input CLP (21, 134) is 0, and the operation is the same as 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 made when the input CLP (21, 134) is 0. If there is no violation in 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 the update circuit 138. However, if the monitoring result 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 informs that the cell is 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 made when the input CLP (21, 134) is 0, and the operation is the same as 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:
This is a dummy determination circuit that outputs the input CLP (21, 134) as the output CLP (31, 134) regardless of the value of the input CLP (21, 134) or the monitoring result 12, that is, does not perform any determination. In the policing circuit according to, when providing various communication services to be described later, the policing circuit is used for adjusting the number of determination circuits to be installed in accordance with the contents of the service.
(6) 1 (D1) 13116:
The determination is made when the input CLP (21, 134) is 1. If the input CLP (21, 134) is 0, the output CLP (31, 134) is set to 0 regardless of the value of the monitoring result 12. Output. When the input CLP (21, 134) is 1 and there is no violation in traffic, 1 is output as the output CLP (31, 134), and the traffic monitoring circuit 11 sends an internal update signal 137 to the update circuit 138. However, if the result of monitoring is a violation, the cell is discarded. At this time, the internal discard signal 133 informs that the cell is discarded.
(7) 1 (D2) 13117:
The determination is made when the input CLP (21, 134) is 1. 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 informs that the cell is discarded. The operation when the input CLP (21, 134) is 1 is the same as 1 (D1) 13116.
[0030]
(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 monitoring result 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 informs 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 and the internal update signal 137 are transmitted to the update circuit 138.
(9) 0 + 1 (T2) 13119:
When the input CLP (21, 134) is 0, the output CLP (31, 134) outputs 0 if there is no violation in traffic. However, if the result of 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 informs that the cell has been tagged. Regardless of the monitoring result 12, the internal update signal 137 sends the internal update signal 137 to the update circuit 138. On the other hand, when the input CLP (21, 134) is 1, the output CLP (31, 134) outputs 0 if there is no violation in traffic. At this time, the traffic monitoring circuit 11 sends an internal update signal 137 to the update circuit 138. However, if the result of 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 informs that the cell is discarded.
(10) 0 + 1 (D) 1311A:
When the input CLP (21, 134) is 0, the output CLP (31, 134) outputs 0 if there is no violation in traffic. At this time, the traffic monitoring circuit 11 sends an internal update signal 137 to the update circuit 138. However, if the result of monitoring is a violation, the cell is discarded. At this time, the internal discard signal 132 informs 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.
[0031]
Specifically, in response to the communication service, whether the determination is performed when the CLP 21 to be monitored shown in FIG. 6 is CLP = 0, whether the determination is performed when CLP = 1, or whether the determination is performed either way. The discard / tagging identifier 139 (Y), which is an identifier indicating whether the input cell is to be discarded or tagged, is determined based on the monitoring CLP 139 (X) that is the identifier to be shown and the determination result shown in FIG. One of the patterns is selected and set in each determination circuit.
[0032]
FIG. 6 shows details of the monitoring CLP 139 (X), which is the monitoring status item 139. The monitoring CLP 139 (X) is 0: 139 (X1) indicating that the determination is performed when CLP = 0, and is 1: 139 (X2) indicating that the determination is performed when CLP = 1, or both are performed. There are three states of 0 + 1: 139 (X3) indicating, and encoding was performed with 2 bits (C1: 139 (3), C0: 139 (2)) to distinguish these. FIG. 7 shows details of the discard / tagging identifier 139 (Y) of the monitoring state item 139. The discard / tagging identifier 139 (Y) indicates T1: 139 (Y1) and T2: 139 (Y2), there are four states D1: 139 (Y3) and D2: 139 (Y4) indicating discarding. In order to distinguish these, two bits (DT1: 139 (1) are used as in the monitoring CLP 139 (X). ), DT0: 139 (0)).
[0033]
FIG. 8 and FIG. 9 are diagrams showing the determination logic for realizing the determination circuit in a truth table, and each operation logic is shown for the determination type 1311 shown in FIG. Input CLP (21, 134), monitoring result 12 (UPC violation), monitoring CLP state 1391 in FIG. 6 and discard / tagging state 1392 in FIG. 7 are input signals, output CLP (21, 134), internal tagging signal 132, a determination circuit 131 using the internal discard signal 133 and the internal update signal 137 as output signals is configured. More specifically, in the policing circuit according to the present invention, when various communication services are provided, a determination circuit corresponding to the service content is selected from the truth table (the state 1391 of the monitoring CLP in FIG. 6 and the state in FIG. 7). The 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 monitoring CLP state of FIG. 6 and the discard / tagging state of FIG. 7, the input CLP (21, 134) and the monitoring result 12 (UPC violation) are indicated by addresses, and the truth table of FIGS. The determination circuit 131 is realized by a memory configured to use the output 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 supporting the communication service by simply rewriting or appending the contents of the memory It can be easily realized without adding. Of course, this memory may be installed at a common location in the apparatus, and only a part of the truth table necessary for determination corresponding to the communication service may be set in the determination circuit. Further, even if it is realized by hardware using a gate circuit or F / F, a microcomputer, and firmware, any logic can be used as long as it can realize the determination logical operation shown in FIGS.
[0034]
10, FIG. 11 and FIG. 12 are diagrams showing the logic for realizing the update circuit for instructing the update of the traffic parameter (current traffic state) in accordance with the determination result. The operation logic instructing whether or not to update the traffic monitoring parameter of the traffic parameter table 40 as a result of the determination by the determination circuit is shown. In the policing circuit according to the present invention, when various communication services are provided, a determination circuit corresponding to the service content is selected from the truth table (the monitoring CLP state 1391 in FIG. 6 and the discard / tagging state 1392 in FIG. 7). And the internal update signal 137, the tagging signal 32, and the discard signal 33 are 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. If 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 logical sum 136 of the internal discard signal, the update circuit 138 sets the traffic monitoring parameter. An update signal 14 to be updated is transmitted. In this embodiment, the monitoring CLP state in FIG. 6, the discard / tagging state in FIG. 7, and the output of the decision circuit shown in the truth table in FIGS. The update circuit 138 is realized by a memory. Of course, this memory may be installed at a common location in the apparatus, and only a part of the truth table necessary for determination corresponding to the communication service may be set in the determination circuit. Further, it may be realized by hardware using a gate circuit or F / F, a microcomputer, and firmware as long as the logical operation of determination shown in FIGS. 10 to 12 can be realized. Note that the determination logic of the determination circuit described above can be included in this memory.
[0035]
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 it can be implemented, it is possible to perform processing as if a plurality of monitoring operations are performed in order. That is, it is possible to easily realize a policing circuit that performs policing corresponding to a communication service in which a plurality of traffic parameters have dependency relationships.
[0036]
Hereinafter, embodiments 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.
[0037]
Specifically, ATM Forum Traffic Management Baseline Text Exeple of Rules Specified in Traffic Contract 3 examples of switched multi-megabit data service, frame relay service, fixed bit rate service, and LAN connection An example of the policing circuit 10 realized by the traffic monitoring circuit 11, the three determination circuits 131 and the three update circuits 138 is shown.
[0038]
<Example 1>
FIG. 14 is a diagram showing traffic monitoring items and monitoring status item 139 patterns monitored in a switched multi-megabit data service (hereinafter abbreviated as SMDS). In order to execute SMDS policing, the monitoring state item 139 of SMDS is selected from the determination type 1311 preset in the traffic parameter table 40 and set in the determination circuit 131 for the overall determination circuit 13. Specifically, as shown in FIG. 15, three determination types 1311 are selected to configure the comprehensive determination circuit 13.
[0039]
That is, in SMDS, the traffic parameter for the peak cell rate of CLP = 0 is set in the traffic parameter table 40 in the traffic monitoring circuit 11a, and this 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, there are only two items to be monitored, that is, the peak cell rate and average rate of CLP = 0, that is, the monitoring circuit 11c is not used, and any traffic parameter may be set in the traffic parameter table 40. Of course, you do not have to set anything. Each traffic monitoring circuit 11a, b, c is not dependent 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, c operate in parallel. , It only monitors for violations of each traffic parameter.
[0040]
Determination circuits 131a, 131b, 131c are connected to the traffic monitoring circuits 11a, 11b, 11c, respectively. In the determination circuits 131a, 131b, and 131c, one of the determination types 1311 shown in FIG. 13 is selected and set by the SMDS monitoring state item 139 set in the traffic parameter. The dependency of policing is determined by the combination of the determination circuits 131a, 131b, 131c, and policing of the SMDS service is realized.
[0041]
If there is a violation (peak cell rate violation) in the traffic monitoring circuit 11a for the cell with input CLP = 0, the decision circuit 131a connected to the traffic monitoring circuit 11a sends an internal discard signal 133, and the cell with input CLP = 1. For pattern 0, pattern 0 (D2) 13114 for sending internal discard signal 133 is used. This decision circuit 131a uses the CLP of the arrival cell as the input CLP21, makes a decision based on the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the determination circuit 131a becomes the input CLP 134a of the determination circuit 131b.
[0042]
If there is a violation (average rate violation) in the traffic monitoring circuit 11b for the cell with the input CLP = 0, the decision circuit 131b connected to the traffic monitoring circuit 11b sends an internal discard signal 133 for the cell with the input CLP = 1. Uses pattern 0 (D2) 13114 for sending the internal discard signal 133. The determination circuit 131b uses the output CLP 134a of the determination circuit 131a as the input CLP 134a, performs determination based on the determination logic shown in FIGS. 8 and 9, and outputs the output CLP 134b. The CLP 134b sent out by the determination circuit 131b becomes the input CLP 134b of the determination circuit 131c.
[0043]
Similar to the monitoring circuit, this service can be realized if there are two determination circuits. Therefore, the determination circuit 131c connected to the traffic monitoring circuit 11c has the input CLP = 0 regardless of the result of the traffic monitoring circuit 11c. A dummy pattern 1 (T) 13115 is used in which a cell is transmitted with CLP = 0 as it is, and a cell with input CLP = 1 is transmitted with CLP = 1 as it is regardless of the result of the traffic monitoring circuit 11c. The determination circuit 131c uses the output CLP 134b of the determination circuit 131b as the input CLP 134b, operates with the logic shown in FIGS. 8 and 9, and outputs the output CLP 134c. The logical sum of the CLP sent out by the judgment circuit 131c and the CLP sent out from another judgment circuit is taken to obtain an output CLP31 from the policing circuit 10.
[0044]
If there is a violation in the traffic monitoring circuit 11a for a cell with input CLP = 0, an internal discard signal 133a is sent to the determination circuit 131a. An update circuit 138a (for pattern 0 (D2) 13114) for sending the discard signal 133a is connected. The update circuit 138a operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137a is sent from the determination circuit 131a and tagging or discarding is not performed in other policing, the traffic monitoring circuit 11a. An update signal 14a for updating the traffic parameters for use is sent.
[0045]
Similarly, if there is a violation in the traffic monitoring circuit 11b for the cell with the input CLP = 0, the determination circuit 131b sends the internal discard signal 133b, and the cell with the input CLP = 1 immediately sends the internal discard signal 133b. An update circuit 138b corresponding to 0 (D2) 13114 is connected. The update circuit 138b operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137b is sent from the determination circuit 131b and tagging or discarding is not performed in other policing, the traffic monitoring circuit 11b. An update signal 14b for updating the traffic parameters for use is sent.
[0046]
An 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, and when the internal update signal 137c is sent from the decision circuit 138c and is not discarded in other policing, it is used for the traffic monitoring circuit 11c. An update signal 14c for updating the traffic parameter is transmitted.
[0047]
<Example 2>
FIG. 16 is a diagram showing patterns of monitoring items and monitoring status items 139 monitored in the frame relay service (hereinafter abbreviated as FRS). In order to execute FRS policing, the FRS monitoring state item 139 is selected from the determination type 1311 preset in the traffic parameter table 40 and set in the determination circuit 131 for the overall determination circuit 13. Specifically, the comprehensive determination circuit 13 is configured by selecting the determination type 1311 as shown in FIG.
[0048]
That is, in FRS, the traffic parameter for the peak cell rate of all cells is set in the traffic parameter table 40 regardless of the CLP value in the traffic monitoring circuit 11a, and this traffic parameter is monitored. The traffic monitoring circuit 11b sets a traffic parameter for average rate of CLP = 0 in the traffic parameter table 40, and monitors the traffic parameter. The traffic monitoring circuit 11c sets traffic parameters for average rate of CLP = 1 in the traffic parameter table 40, and monitors the traffic parameters. As in the first embodiment, the traffic monitoring circuits 11a, b, and c are not dependent 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 , C operate in parallel and only monitor each traffic parameter for violations.
[0049]
The determination circuits 131a, b, and c are connected to the traffic monitoring circuits 11a, 11b, and 11c, respectively. The FRS monitoring state item 139 set in the traffic parameter indicates that the determination type 1311 shown in FIG. One of them is selected and set. The FRS service policing is realized by a combination of the determination circuits 131a, 131b, and 131c.
[0050]
The decision circuit 131a connected to the traffic monitoring circuit 11a has a pattern 0 + 1 (D) for sending an internal discard signal 133 when there is a violation (peak cell rate violation) in the traffic monitoring circuit 11a for all input cells regardless of the CLP value. ) Use 1311A. This decision circuit 131a uses the CLP of the arrival cell as the input CLP21, makes a decision based on the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the determination circuit 131a becomes the input CLP 134a of the determination circuit 131b.
[0051]
The decision circuit 131b connected to the traffic monitoring circuit 11b sends an internal tagging signal 132 when there is a violation (average rate violation) in the traffic monitoring circuit 11b for the cell with the input CLP = 0, and in the cell with the input CLP = 1. Uses pattern 0 (T1) 13111 for sending CLP = 1 as it is. The determination circuit 131b uses the output CLP 134a of the determination circuit 131a as the input CLP 134a, performs determination based on the determination logic shown in FIGS. 8 and 9, and outputs the output CLP 134b. The CLP 134b sent out by the determination circuit 131b becomes the input CLP 134b of the determination circuit 131c.
[0052]
The decision 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. The determination circuit 131c is used for the pattern 1 (D1) 13116 for sending the internal discard signal 133. The determination circuit 131c uses the output CLP 134b of the determination circuit 131b as the input CLP 134b, performs determination based on the determination logic shown in FIGS. 8 and 9, and outputs an output CLP 31. The CLP transmitted from the determination circuit 131c and the CLP transmitted from another determination circuit are logically ORed to become an output CLP31 from the policing circuit 10.
[0053]
The determination circuit 131a has a one-to-one correspondence with the determination pattern (that is, for the pattern 0 + 1 (D) 1311A that sends out the internal discard signal 133a when there is a violation in the traffic monitoring circuit 11a for all input cells regardless of CLP. ) The update circuit 138a is connected. The update circuit 138a operates with 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 sent from the determination circuit 131a and the cell is not discarded in other policing. The update signal 14a for updating the traffic parameter is sent out.
[0054]
Similarly, when there is a violation in the traffic monitoring circuit 11b for the cell with CLP = 0, the determination circuit 131b sends the internal tagging signal 132b, and for the cell with CLP = 1, the pattern 0 (T1) for sending CLP = 1 as it is. An update circuit 138b corresponding to 13111 is connected. The update circuit 138b operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137b is sent from the determination circuit 131b and tagging or discarding is not performed in other policing, the traffic monitoring circuit 11b. An update signal 14b for updating the traffic parameters for use is sent.
[0055]
Similarly, CLP = 0 is sent to the determination circuit 131c as it is for the cell with the input CLP = 0, and if there is a violation in the traffic monitoring circuit 11c for the cell with the input CLP = 1, the pattern 0 (outgoing internal discard signal 133c is sent). D1) An update circuit 138c corresponding to 13116 is connected. The update circuit 138c operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137c is sent from the determination circuit 138c and tagging or discarding is not performed in other policing, the traffic monitoring circuit 11c. An update signal 14c for updating the traffic parameters for use is sent.
[0056]
<Example 3>
FIG. 18 is a diagram showing patterns of monitoring items and monitoring status items 139 in the 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 determination type 1311 preset in the traffic parameter table 40 and set in the determination circuit 131 for the overall determination circuit 13. Specifically, as shown in FIG. 19, the determination type 1311 is selected to configure the comprehensive determination circuit 13.
[0057]
That is, in the CBR, it is assumed that the traffic parameter for the peak cell rate of CLP = 0 is set in the traffic parameter table 40 in the traffic monitoring circuit 11a and this traffic parameter is monitored. In this service, the monitoring item is only one item of the peak cell rate of CLP = 0, that is, since the traffic monitoring circuit 11b and the traffic monitoring circuit 11c are not used, any traffic as in the traffic monitoring circuit 11c of the first embodiment is used. The parameters may be set in the traffic parameter table 40. Each traffic monitoring circuit 11 is not dependent on each other, and if the cell arrives at the host device 60 and the policing circuit 10 recognizes, the three traffic monitoring circuits 11 operate in parallel, and whether there is a violation in each traffic parameter. Only the monitoring is performed in the same manner as in the first and second embodiments.
[0058]
Determination circuits 131a, 131b, 131c are connected to the traffic monitoring circuits 11a, 11b, 11c, respectively. In the determination circuits 131a, b, and c, one of the determination types 1311 shown in FIG. 13 is selected and set by the CBR monitoring state item 139 set in the traffic parameter. Policing of the CBR service is realized by a combination of the determination circuits 131a, 131b, and 131c.
[0059]
If there is a violation (peak cell rate violation) in the traffic monitoring circuit 11a for the cell with input CLP = 0, the decision circuit 131a connected to the traffic monitoring circuit 11a sends an internal discard signal 133, and the cell with input CLP = 1. , Pattern 0 (D2) 13114 for sending the internal discard signal 133 is used. This decision circuit 131a uses the CLP of the arrival cell as the input CLP21, makes a decision based on the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the determination circuit 131a becomes the input CLP 134a of the determination circuit 131b.
[0060]
Like the monitoring circuit, this service can be realized if there is one determination circuit. Therefore, the input circuit 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. CLP = 0 is transmitted as it is in the cell No. 1 regardless of the result of the traffic monitoring circuit, and dummy cell 1 (CLP = 1 is transmitted as it is regardless of the result of the traffic monitoring circuit 11 in the cell of the input CLP = 1). T) 13115 is used. These determination circuits 131 operate according to the logic shown in FIGS. 8 and 9 and output the output CLP 134. The CLP transmitted from each of the determination circuits 131a, 131b, and 131c is ORed to become an output CLP31 from the policing circuit 10.
[0061]
When there is a violation in the traffic monitoring circuit 11a for the cell with input CLP = 0, the internal discard signal 133a is sent to the determination circuit 131a. An update circuit 138a (for pattern 0 (D2) 13114) that transmits 133a is connected. The update circuit 138a operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137a is sent from the determination circuit 131a and tagging or discarding is not performed in other policing, the traffic monitoring circuit 11a. An update signal 14a for updating the traffic parameters for use is sent.
[0062]
Similarly, the update circuits 138b and c corresponding to the dummy pattern 1 (T) 13115 are connected to the determination circuits 131b and c. The update circuit 138 operates with 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 sent from the determination circuit 131 and is not tagged or discarded in other policing. The update signal 14 for updating the traffic parameter is sent out.
[0063]
<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 the policing of the inter-LAN connection service, the monitoring state item 139 of the inter-LAN connection is selected from the judgment type 1311 preset in the traffic parameter 40 in the general judgment circuit 13 and set in the judgment circuit 131. Specifically, as shown in FIG. 21, the determination type 1311 is selected to configure the comprehensive determination circuit 13.
[0064]
That is, in the inter-LAN connection service, the traffic parameter for the 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 traffic monitoring circuit 11b sets a traffic parameter for 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 average rate of CLP = 1 in the traffic parameter table 40, and monitors the traffic parameter. Similar to the above embodiment, each traffic monitoring circuit 11a, b, 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, 11a, 11c, b and c operate in parallel and only monitor each traffic parameter for violations.
[0065]
Determination circuits 131a, 131b, 131c are connected to the traffic monitoring circuits 11a, 11b, 11c, respectively. In the determination circuits 131a, b, and c, one of the determination types 1311 shown in FIG. 13 is selected and set by the monitoring state item 139 of the inter-LAN connection service set in the traffic parameter. The inter-LAN service policing is realized by a combination of the determination circuits 131a, 131b, and 131c.
[0066]
If there is a violation (peak cell rate violation) in the traffic monitoring circuit 11a for the cell with input CLP = 0, the decision circuit 131a connected to the traffic monitoring circuit 11a sends an internal discard signal 133, and the cell with input CLP = 1. As for the pattern 0, the pattern 0 (D2) 13114 for sending the internal discard signal 133 immediately is used. This decision circuit 131a uses the CLP of the arrival cell as the input CLP21, makes a decision based on the decision logic shown in FIGS. 8 and 9, and outputs an output CLP 134a. The CLP 134a sent out by the determination circuit 131a becomes the input CLP 134a of the determination circuit 131b.
[0067]
The decision circuit 131b connected to the traffic monitoring circuit 11b sends an internal tagging signal 132 if there is a violation (average rate violation) in the traffic monitoring circuit 11b for the cell with the input CLP = 0, and for the cell with the input CLP = 1. Uses pattern 0 (T1) 13111 for sending CLP = 1 as it is. The determination circuit 131b uses the output CLP 134a of the determination circuit 131a as the input CLP 134a, performs determination based on the determination logic shown in FIGS. 8 and 9, and outputs the output CLP 134b. The CLP 134b sent out by the determination circuit 131b becomes the input CLP 134b of the determination circuit 131c.
[0068]
The decision circuit 131c connected to the traffic monitoring circuit 11c transmits CLP = 0 as it is for the cell with the input CLP = 0, and the traffic monitoring circuit 11c has a violation (average rate violation) for the cell with the input CLP = 1. And pattern 1 (D1) 13116 for sending an internal discard signal 133 is used. The determination circuit 131c uses the output CLP 134b of the determination circuit 131b as the input CLP 134b, performs determination based on the determination logic shown in FIGS. 8 and 9, and outputs the output CLP 134c. The logical sum of the CLP sent out by the judgment circuit 131c and the CLP sent out from another judgment circuit is taken as an output CLP31 from the policing circuit 10.
[0069]
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 a cell with input CLP = 0, an internal discard signal 133a is sent, and for a cell with input CLP = 1, An update circuit 138a (for determination pattern 0 (D2) 13114) that immediately transmits an internal discard signal 133a is connected. The update circuit 138a operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137a is sent from the determination circuit 131a and tagging or discarding is not performed in other policing, the traffic monitoring circuit 11a. An update signal 14a for updating the traffic parameters for use is sent.
[0070]
Similarly, if there is a violation in the traffic monitoring circuit 11b for the cell with the input CLP = 0, the internal tagging signal 132b is transmitted to the determination circuit 131b, and CLP = 1 is transmitted for the cell with the input CLP = 1. An update circuit 138b corresponding to (T1) 1311 is connected. The update circuit 138b operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137b is sent from the determination circuit 131b and tagging or discarding is not performed in other policing, the traffic monitoring circuit 11b. An update signal 14b for updating the traffic parameters for use is sent.
[0071]
Similarly, the determination circuit 131c transmits CLP = 0 as it is for the cell with the input CLP = 0, and the determination pattern 0 for transmitting the internal discard signal 133c when there is a violation in the traffic monitoring circuit 11c for the cell with the input CLP = 1. (D1) An update circuit 138c corresponding to 13116 is connected. The update circuit 138c operates with the logic shown in FIGS. 10, 11 and 12, and when the internal update signal 137c is sent from the determination circuit 138c and is not discarded in other policing, the traffic for the traffic monitoring circuit 11c An update signal 14c for updating the parameter is transmitted.
[0072]
<Example 5>
In the above-described four embodiments, three traffic monitoring circuits, determination circuits, and update circuits are prepared, and monitoring items and determination patterns corresponding to communication services are selected and set in these circuits. It was shown that the policing circuit corresponding to the communication service can be realized even with the same circuit configuration. Depending on the content of the communication service, more traffic monitoring circuits, determination circuits, and update circuits may be required. However, according to the present invention, a sufficient number of traffic monitoring circuits, determination circuits, and update circuits are prepared in advance in the policing circuit as in the following embodiments (for example, the maximum number of circuits that can be assumed in advance). For services that use few circuits, dummy patterns are set as in the above-described embodiment, so that it is possible to easily deal with a wide variety of 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 is not increased in the communication service, and the delay time does not become a problem. Hereinafter, an example of a 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 update circuits 138 will be described.
[0073]
FIG. 22 is a diagram showing patterns of monitoring items and monitoring status items 139 in the variable bit rate service (hereinafter abbreviated as VBR). In order to execute VBR policing, the VBR monitoring state item 139 is selected from the determination type 1311 preset in the traffic parameter 40 in the general determination circuit 13 and set in the determination circuit 131. Specifically, as shown in FIG. 23, the determination type 1311 is selected to configure the comprehensive determination circuit 13.
[0074]
That is, in VBR, the monitoring circuit monitors the peak cell rate and average rate of cells arriving at CLP = 0 and the peak cell rate and average rate of cells arriving at CLP = 1 by four monitoring circuits. The monitoring item setting method is the same as in the above-described embodiment. A cell arriving at CLP = 0 determines a violation of the peak cell rate under the condition of CLP = 0 by the determination circuit at the first stage, and an allowed cell is averaged under the condition of CLP = 0 by the determination circuit at the second stage. Determine rate violations. Among cells that arrived with CLP = 0, cells that are determined to be in violation at the first or second stage are tagged. A cell tagged in the first stage or the second stage and a cell arriving with CLP = 1 are determined to have a peak cell rate violation and an average rate violation in the third or fourth stage determination circuit, respectively. If there is a violation, the cell is discarded. Specifically, in FIG. 4, the policing circuit 10 monitors the peak cell rate of a cell that arrives at CLP = 0 in the traffic monitoring circuit 11a as the first monitoring item, and the second monitoring item is the traffic. The monitoring circuit 11b monitors the average rate of cells arriving with CLP = 0, and the third monitoring item monitors the peak cell rate of cells arriving with CLP = 1 by the traffic monitoring circuit 11c. In the item, the traffic monitoring circuit 11d monitors the average rate of a cell arriving with CLP = 1. These monitoring results 12 are input to the comprehensive judgment circuit 13. The overall determination circuit 13 selects 0 (T1) 13111 as the determination circuit 131a, 0 (T1) 13111 as the determination circuit 131b, 1 (D1) 13116 as the determination circuit 131c, and 1 (D1) 13116 as the determination circuit 131d. This is a policing circuit used for setting in the circuit.
[0075]
【The invention's effect】
As described above, according to the policing method and circuit of the present invention as described in the embodiment, in the policing in which there are a plurality of monitoring items for realizing various communication services and the determination order thereof is defined, FIG. 28, a plurality of traffic monitoring circuits are installed independently, and a determination circuit and an update circuit having a determination order are separated from the monitoring circuit and combined to provide a comprehensive determination circuit. Even in complicated policing (for example, policing with N monitoring items), it is possible to perform traffic monitoring that requires processing time in parallel. Therefore, as shown in FIG. 29, policing processing is the same as policing with one monitoring item. Therefore, policing with a small cell delay suitable for high-speed broadband communication can be performed. In addition, since a sufficient number of monitoring circuits, determination circuits and update circuits necessary for policing are installed in advance and the necessary parameters are set for each circuit corresponding to the communication service, the same operation is performed. A policing circuit that provides multi-service economically without the need for additional circuits by hardware can be easily realized.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a polishing circuit according to the present invention.
FIG. 2 is a diagram showing another configuration of the policing circuit of the present invention.
FIG. 3 is a configuration diagram of a policing circuit that similarly uses three traffic monitoring circuits.
FIG. 4 is a configuration diagram of a policing circuit that similarly uses four traffic monitoring circuits.
5 is a configuration diagram of an overall determination circuit of the policing circuit shown in FIG. 3 as well. FIG.
FIG. 6 is a diagram showing a detailed state of a monitoring CLP identifier.
FIG. 7 is a diagram illustrating a detailed state of a discard / tagging identifier.
FIG. 8 is a diagram (1/2) showing a truth table showing a logical operation of the determination circuit;
FIG. 9 is a diagram (2/2) illustrating a truth table indicating a logical operation of the determination circuit.
FIG. 10 is a diagram (1/3) showing a truth table showing a logical operation of the update circuit;
FIG. 11 is a diagram (2/3) illustrating a truth table indicating the logical operation of the update circuit.
FIG. 12 is a diagram (3/3) illustrating a truth table indicating the logical operation of the update circuit.
13 is a diagram illustrating determination types (patterns) executed by a determination circuit 131. FIG.
FIG. 14 is a diagram showing monitoring status items of a switched multi-megabit service.
FIG. 15 is a connection diagram of a determination circuit for a switched multi-megabit service.
FIG. 16 is a diagram showing monitoring status items of a frame relay service.
FIG. 17 is a connection diagram of a determination circuit for a frame relay service.
FIG. 18 is a diagram showing monitoring status items of a fixed bit rate service.
FIG. 19 is a connection diagram of a determination circuit for a fixed bit rate service.
FIG. 20 is a diagram showing monitoring status items of connection between LANs.
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 determination circuit for a variable bit rate service.
FIG. 24 is a diagram illustrating dependency relationships of monitoring state items in a communication service.
FIG. 25 is a general configuration diagram of a policing circuit having a dependency relationship on a monitoring state item.
26 is an operation sequence diagram of the policing circuit of FIG. 25. FIG.
FIG. 27 is a diagram showing the dependency relationship of monitoring state items according to the policing method of the present invention.
FIG. 28 is a block diagram of a circuit for realizing the policing method of the present invention.
29 is an operation sequence diagram of the policing circuit of FIG. 28. FIG.
[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 (10)

An ATM communication device for transmitting and receiving cells in an asynchronous transfer mode network,
Interface means for transmitting and receiving the network and the cell;
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
And a determination unit provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits,
The determination unit receives the interface unit based on a plurality of monitoring results output from the monitoring unit, information on traffic included in the input cell, and cell processing rules defined for the communication service provided by the network. An ATM communication apparatus for determining whether to permit tagging, discarding, or input of a received cell. An ATM communication device for transmitting and receiving cells in an asynchronous transfer mode network,
Interface means for transmitting and receiving the network and the cell;
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
Determination means provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits;
Storage means for holding the traffic state of the input cell;
Update means provided with a plurality of update circuits corresponding to the plurality of monitoring circuits for updating the contents of the storage means,
The determination unit receives the interface unit based on a plurality of monitoring results output from the monitoring unit, information on traffic included in the input cell, and cell processing rules defined for the communication service provided by the network. The ATM communication apparatus is characterized in that it is determined whether tagging, discarding, or input permission is permitted, and the updating means updates the traffic state of the storage means. Asynchronous Transfer mode - de of networks - an ATM communication device for transmitting and receiving cells with click,
Monitoring means provided in parallel with a plurality of monitoring circuits, each monitoring traffic of an input cell with either a peak cell rate traffic parameter or an average cell rate traffic parameter;
A plurality of monitoring results output in parallel from the monitoring means and cell identification information included in the input cell are input, and based on a cell processing rule defined for the communication service provided by the asynchronous transfer mode network A determination unit provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits for determining whether the input cell is tagged, discarded, or permitted to be input;
An interface means for processing and outputting an input cell based on the output of the monitoring means and the determining means and the cell processing rule;
An ATM communication apparatus which performs either processing of outputting a cell arriving from the network as it is, tagging and outputting the arriving cell, or discarding the arriving cell. Asynchronous Transfer mode - de of networks - an ATM communication device for transmitting and receiving cells with click,
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
Whether the outputs of the plurality of monitoring circuits and cell identification information are input, and the input cells are tagged, discarded, or permitted to be input based on the cell processing rules defined for the communication service provided by the asynchronous transfer mode network Determination means provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits to determine,
An ATM communication device characterized in that a cell arriving from the network is processed and output or discarded based on a cell processing rule of a switched multi-megabit service. Asynchronous Transfer mode - de of networks - an ATM communication device for transmitting and receiving cells with click,
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
Whether the outputs of the plurality of monitoring circuits and cell identification information are input, and the input cells are tagged, discarded, or permitted to be input based on the cell processing rules defined for the communication service provided by the asynchronous transfer mode network Determination means provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits to determine,
An ATM communication apparatus, wherein a cell arriving from the network is processed and output or discarded based on a cell processing rule of a frame relay service. Asynchronous Transfer mode - de of networks - an ATM communication device for transmitting and receiving cells with click,
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
Whether the outputs of the plurality of monitoring circuits and cell identification information are input, and the input cells are tagged, discarded, or permitted to be input based on the cell processing rules defined for the communication service provided by the asynchronous transfer mode network Determination means provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits to determine,
An ATM communication apparatus characterized in that a cell arriving from the network is processed and output or discarded based on a cell processing rule of a constant bit rate service. Asynchronous Transfer mode - de of networks - an ATM communication device for transmitting and receiving cells with click,
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
Whether the outputs of the plurality of monitoring circuits and cell identification information are input, and the input cells are tagged, discarded, or permitted to be input based on the cell processing rules defined for the communication service provided by the asynchronous transfer mode network Determination means provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits to determine,
An ATM communication apparatus characterized in that a cell arriving from the network is processed and output or discarded based on a cell processing rule of an inter-LAN connection service. Asynchronous Transfer mode - de of networks - an ATM communication device for transmitting and receiving cells with click,
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
Whether the outputs of the plurality of monitoring circuits and cell identification information are input, and the input cells are tagged, discarded, or permitted to be input based on the cell processing rules defined for the communication service provided by the asynchronous transfer mode network Determination means provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits to determine,
An ATM communication apparatus, wherein a cell arriving from the network is processed and output or discarded based on a cell processing rule of a variable bit rate service. Asynchronous Transfer mode - de of networks - an ATM communication device for transmitting and receiving cells with click,
Monitoring means provided with a plurality of monitoring circuits for monitoring input cell traffic in parallel for each item;
Whether the outputs of the plurality of monitoring circuits and cell identification information are input, and the input cells are tagged, discarded, or permitted to be input based on the cell processing rules defined for the communication service provided by the asynchronous transfer mode network Determination means provided with a plurality of determination circuits corresponding to the plurality of monitoring circuits to be determined;
A monitoring unit for traffic in the monitoring unit, a setting unit for setting the determination unit and the determination rule;
Based on the above setting, cells that arrive from the network are processed and output or discarded by any of the switched multi-megabit service, frame relay service, constant bit rate service, LAN connection service, and variable bit rate service. ATM communication equipment. 10. The ATM communication apparatus according to claim 4, wherein the monitoring circuit can set either a peak cell rate traffic parameter or an average cell rate traffic parameter of an input cell as a traffic monitoring item.

Images