KR20010063768A - Line Interface Apparatus MutiProtocol Label Switch System - Google Patents

Abstract

PURPOSE: A subscriber interface device of an MPLS(MultiProtocol Label Switch) system is provided to supply a high IP(Internet Protocol) service by using virtual channel merge and traffic shaping functions. CONSTITUTION: A receiving physical layer processor(200) extracts only ATM(Asynchronous Transfer Mode) cells from each transfer frame. A receiving ATM layer processor(201) identifies the ATM cells each VPI(Virtual Path Identifier)/VCI(Virtual Channel Identifier) number, and performs a traffic monitoring and an OAM(Operation And Maintenance) cell process. A receiving traffic manager(202) decides a transmitting priority according to a traffic state of a switch fabric, and transmits the ATM cells to a switch. A transmitting traffic manager(203) decides a delay priority according to a traffic state of a physical link, and transmits the ATM cells to a transmitting ATM layer processor(204). The transmitting ATM layer processor(204) transmits an IP(Internet Protocol) cell to an AAL5(ATM Adaptation Layer5) frame extractor(205), and transmits pure ATM cells to a traffic shaping processor(206). The AAL5 frame extractor(205) assembles the IP cell as an AAL5 frame, and classifies the AAL 5 frame to be divided into the ATM cells, then transmits the ATM cells to the traffic shaping processor(206). The traffic shaping processor(206) transmits IP packet data to a transmitting physical layer processor(207). The transmitting physical layer processor(207) converts the ATM cells into a frame form for transmitting to a subscriber device. A controller(208) manages routing information and OAM information, and transmits generated OAM cells to the transmitting ATM cell processor.

Description

Subscriber matching device for multiprotocol label switch system {Line Interface Apparatus MutiProtocol Label Switch System}

The present invention relates to a subscriber matching device of a multi-protocol label switch (MPLS) system. In particular, an ATM (Asynchronous Transfer Mode) service as well as a virtual channel (VC) merge and traffic shaping function are provided in an ATM network. The present invention relates to a subscriber matching device for a multiprotocol label switch system for providing an explosive increase in IP (Internet Protocol) services.

In general, as shown in FIG. 1, a multiprotocol label switch system includes a plurality of subscriber matching devices 100 and 101, a switch device 103 connected to the subscriber matching devices 100 and 101, and It is configured to include a control device 102 for controlling the subscriber matching device (100, 101) and the switch device 103, and provides an ATM service in the ATM network.

The role and function of each component of the multiprotocol label switch system will be described below.

The subscriber matching device (100, 101) restores the ATM cell delivered from the subscriber and delivers it to the switch device 103, or conversely delivers the cell delivered from the switch device 103 to the subscriber. That is, the subscriber matching device 100, 101 attaches a routing tag to the switching device 103 in order to deliver the ATM cell delivered from the subscriber to the destination, or, conversely, processes the ATM cell delivered from the switching device 103. To the destination user. In addition, the subscriber matching device (100, 101) performs a maintenance function to ensure the delivery of the ATM cell.

The switch device 103 exchanges the ATM cells received from the subscriber matching devices 100 and 101 and delivers them to the destination subscriber matching device.

The control apparatus 102 controls and manages the subscriber matching apparatuses 100 and 101 and the switch apparatus 103, and performs functions such as call setup and release for exchanging ATM cells.

The control device 102 and the subscriber matching device 100 and 101 and the switch device 103 exchange control messages using Ethernet.

However, the conventional multiprotocol label switch system as described above does not provide a virtual channel (VC) merge function required to provide an IP service, thereby providing an IP service.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, and provides a virtual channel merge and traffic shaping function to a subscriber matching device of a multiprotocol label switch system to provide a conventional ATM service for high speed (eg, 622Mbps) traffic. The present invention provides a subscriber matching device for a highly integrated multiprotocol label switch system that can provide IP services by providing virtual channel merging and traffic shaping functions.

1 is a structural diagram of a typical multiprotocol label switch system.

2 is a detailed structural diagram of a subscriber registration device of a multiprotocol label switch system according to an embodiment of the present invention;

Explanation of symbols on the main parts of the drawings

200: receiving physical layer processing unit 201: receiving ATM layer processing unit

202: Received Traffic Management Unit 203: Transmitted Traffic Management Unit

204: Transmission ATM layer processing unit 205: AAL5 frame extraction unit

206: traffic shaping processing unit 207: transmission physical layer processing unit

In order to achieve the above object, the subscriber matching device of the multiprotocol label switch system of the present invention includes: a reception physical layer processing unit for recovering data from a physical medium, extracting only an ATM cell from each transport frame, and transmitting the extracted ATM cell to a reception ATM layer processing unit; Receive ATM layer processing unit for receiving the cell from the physical layer processing unit 200 to identify the ATM cell for each virtual path identification number (VPI) / virtual channel identification number (VCI) to process traffic monitoring and OAM cells, and switch output Receive traffic management unit that distinguishes ports and four priority classes, stores them in a buffer, determines the transmission priority according to the traffic state of the switch fabric, and delivers ATM cells to the switch. And priority classes are identified and stored in their respective buffers. Determines the priority, identifies the transmission traffic management unit that delivers the ATM cell to the transmitting ATM layer processing unit, identifies the IP packet for providing the IP service, and the pure ATM cell that provides the existing ATM service, and delivers the IP cell to the AAL5 frame extractor. The transmitting ATM layer processor for transmitting the pure ATM cell to the traffic shaping processor 206, the IP cell received from the transmitting ATM layer processor, assembled into an AAL5 frame, and identified the same AAL5 frame with the same destination and the same class of service. AAL5 frame extractor for splitting into ATM cells with identification number (VPI) / VCI (VCI) values and forwarding them to traffic shaping, and the traffic forwarding rate required by the user for IP packet data received from the AAL5 frame extractor Decomposed into 53-byte ATM cells and transmitted to the transmit physical layer processor, or transmitted from the transmit ATM layer processor. A traffic shaping processor for transmitting an ATM cell to a transmission physical layer processor at a traffic speed desired by the user, and a transmission physical layer processor for converting an ATM cell transmitted from the traffic shaping processor into a frame shape suitable for a transmission line and transmitting the same to a subscriber device. And manages routing information received from the control unit of the ATM switch and maintenance information in the subscriber matching device, processes the OAM cell delivered from the receiving ATM cell processing unit, and generates and transmits the OAM cell at the request of the control unit. It includes a control unit for transmitting to the cell processing unit.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings in order to be described in detail to those skilled in the art can easily practice the present invention.

As shown in FIG. 2, the subscriber matching device of the multi-protocol label switch system according to an embodiment of the present invention recovers data from a physical medium, extracts only an ATM cell from each transport frame, and receives an ATM layer. Receives the cell from the reception physical layer processing unit 200 and the reception physical layer processing unit 200 delivered to the processing unit to identify the ATM cell for each virtual path identification number (VPI) / virtual channel identification number (VCI) to monitor traffic and Receive ATM layer processing unit 201 for processing OAM cell, switch output port and four priority classes are stored in the buffer and transfer priority of the ATM cell to the switch by determining the transfer priority according to the traffic state of the switch fabric Received traffic management unit 202, and receives the cell from the switch fabric, identify each physical link port and priority class, and store in each buffer and water A transmission traffic management unit 203 for determining a delay priority according to the relink traffic state and delivering an ATM cell to the transmitting ATM layer processing unit 204, an IP packet for providing an IP service, and an existing ATM service for providing an IP service. Identifies the pure ATM cell, delivers the IP cell to the AAL5 frame extractor, and receives the IP cell from the transmitting ATM layer processor 204 and the transmitting ATM layer processor 204, which delivers the pure ATM cell to the traffic shaping processor 206. An AAL5 frame extractor that assembles AAL5 frames, identifies AAL5 frames with the same destination and the same class of service, divides them into ATM cells with the same virtual path identification number (VPI) / virtual channel identification number (VCI) and forwards them to traffic shaping. 205 and the IP packet data received from the AAL5 frame extractor 205 into a 53-byte ATM cell at the traffic transfer rate required by the user, and then transmits the physical data. A traffic shaping processor 206 for transmitting the pure ATM cell transmitted from the processor 207 or the transmitting ATM layer processor 204 to the transmission physical layer processor 207 at a desired traffic rate, and the traffic shaping processor ( Transmitting physical layer processing unit 207 for converting the ATM cell transmitted in step 206 into a frame form suitable for a transmission line and transmitting it to the subscriber device, and routing information and subscriber matching device delivered from the control unit 102 of the ATM switch. The controller 208 manages the maintenance information, processes the OAM cell delivered from the receiving ATM cell processing unit, and generates an OAM cell at the request of the controller 102 and transmits the generated OAM cell to the transmitting ATM cell processing unit.

By the above configuration, the subscriber matching device of the multiprotocol label switch system according to the embodiment of the present invention is as follows.

The reception physical layer processing unit 200 extracts an ATM cell from the data transmitted from the subscriber and delivers the ATM cell to the reception ATM layer processing unit 201.

The receiving ATM layer processing unit 201 receives the ATM cell from the receiving physical layer processing unit 200 and checks whether the negotiated traffic is observed. If an ATM cell that does not comply with the negotiated traffic is received, the received ATM cell is discarded or notified and transmitted to the receiving traffic management unit 202. In addition, the cell to be processed for the input OAM cell is terminated and transferred to the controller 208.

The reception traffic management unit 202 has a buffer having four priorities for each switch output port in order to store ATM cells transmitted from the reception ATM layer processing unit 201. Accordingly, for the ATM cell delivered from the receiving ATM layer processing unit 204, the output switch port and the priority level are classified and stored in the corresponding buffer. If a signal is received from the switch device 103 that it is difficult to receive traffic due to traffic congestion at a specific output switch port, the data of the corresponding output port is not transmitted. Otherwise, the output cell information and priority class are included in the ATM cell. Attached to the header to pass to the switch device 103. In addition, when there are ATM cells to be output at the same time in several buffers, the order of ATM cells to be output is determined by the order of priority and transfers the ATM cells to the switch device 103.

The transmission traffic management unit 203 has a buffer having four priorities for each physical link number in order to store cells transmitted from the switch device 103. Accordingly, when the cell is delivered from the switch device 103, the output physical link number and priority level are classified and stored in the corresponding buffer. If congestion occurs because a cell is excessively transferred to a specific physical link, the cell with a higher priority is transferred first considering the priority, and the cell is discarded when the cell is stored beyond the allowed buffer size.

The transmitting ATM layer processing unit 204 distinguishes the IP cell for providing the IP service from the pure ATM cell providing the existing ATM service, and delivers the IP cell to the AAL5 frame extracting unit 205, and the pure ATM cell provides traffic. Transfer to the shaping processing unit 206. In addition, the OAM cell is received from the controller 208 and transferred to the traffic shaping processor 206.

The AAL5 frame extraction unit 205 receives the IP cell from the transmitting ATM layer processing unit 204 and assembles the AAL5 frame. In addition, it distinguishes whether the assembled AAL5 frame has the same destination and the same service class, and has the same virtual path identification number (VPI) / virtual channel identification number (VCI) value for the AAL5 frame having the same destination and the same service class. By dividing into ATM cells, the virtual channel is merged and transferred to the traffic shaping processor 206.

The virtual channel merging function assigns a virtual path identification number (VPI) / virtual channel identification number (VCI) value to ATM cells having the same destination and the same class of service, thereby providing a virtual path identification number (VPI) / virtual channel identification. Number (VCI) A method of reducing waste of resources.

In general, in order to access an ATM network, there must be an ATM adaptation layer (AAL) that converts any type of information supplied by a user into an ATM cell or vice versa. Different types of information require different ATM adaptation layers (AALs). Accordingly, the ATM adaptation layer (AAL) acts as a terminal adapter that converts the information provided by the user into the general ATM format required by the network. That is, the ATM adaptation layer (AAL) is responsible for improving the services provided by the ATM layer to support the functions required by the upper layer.

The traffic shaping processing unit 206 transfers the ATM cell delivering the IP packet received from the AAL5 frame extracting unit 205 to the transmission physical layer processing unit 207 at the traffic transmission rate required by the user, and transmits the ATM layer processing unit ( The pure ATM cell delivered from 204 is transmitted to the transmission physical layer processor 207 at a traffic speed desired by the user.

The transmission physical layer processing unit 207 converts the ATM cell transferred from the traffic shaping processing unit 206 into a frame shape suitable for the transmission line, and transmits the same to the subscriber matching apparatuses 100 and 101.

The control unit 208 manages routing information received from the control unit 102 of the ATM switch and maintenance information in the subscriber matching apparatuses 100 and 101. It also processes the OAM cell delivered by the receiving ATM cell processing unit, generates an OAM cell at the request of the controller 102, and delivers the OAM cell to the transmitting ATM cell processing unit.

The present invention has been presented in order to make it easier to understand the technical gist of the present invention, rather than to limit the scope of the above-described embodiments and the accompanying drawings, which are within the scope of the technical spirit of the present invention. It is apparent to those skilled in the art that various substitutions, modifications, and alterations in the present disclosure, such various substitutions, modifications, and alterations are also within the scope of the present invention.

As described above, the present invention provides a high-speed IP service in an ATM network by using a virtual channel merge and a traffic shaping function capable of processing high-speed (eg, 622 Mbps) traffic in addition to the service provided in an existing ATM network. Has an excellent effect.

Claims (4)

In the subscriber registration device of a multiprotocol label switch system, A reception physical layer processing unit for recovering data from a physical medium, extracting only an ATM cell from each transport frame, and transmitting the extracted ATM cell to a reception ATM layer processing unit; A receiving ATM layer processing unit receiving the cell from the receiving physical layer processing unit to identify the ATM cell for each virtual path identification number (VPI) / virtual channel identification number (VCI) to process traffic monitoring and OAM cells; A reception traffic management unit for classifying a switch output port and a plurality of priority classes, storing them in a buffer, determining a transmission priority according to the traffic state of the switch fabric, and delivering an ATM cell to the switch; Transmit traffic management unit that receives the cell from the switch fabric, identifies each physical link port and priority class, stores them in each buffer, determines the delay priority according to the traffic state of the physical link, and delivers the ATM cell to the transmitting ATM layer processor. ; A transmission ATM layer processor for identifying an IP packet for providing an IP service and a pure ATM cell for providing an existing ATM service, delivering the IP cell to the AAL5 frame extractor, and delivering the pure ATM cell to the traffic shaping processor; Receives an IP cell from the transmitting ATM layer processor, assembles it into an AAL5 frame, identifies an AAL5 frame having the same destination and the same service class, and then transfers the same cell to an ATM cell having the same virtual path identification number (VPI) / virtual channel identification number (VCI). An AAL5 frame extractor for dividing and delivering the traffic shaping; A traffic shaping processor for transmitting the IP packet data received from the AAL5 frame extractor to a transmission physical layer processor; The transmission physical layer processing unit converting the ATM cell transferred from the traffic shaping processing unit into a frame shape suitable for a transmission line and transferring the same to a subscriber device; Manages routing information received from the control unit of the ATM exchanger and maintenance information in the subscriber matching device, processes the OAM cell delivered from the receiving ATM cell processing unit, generates an OAM cell at the request of the control unit, and transmits the ATM cell processing unit. Control to pass to Subscriber matching device of the multi-protocol label switch system comprising a. The method of claim 1, The receiving traffic management unit distinguishes the switch output port and the four priority classes and stores in a buffer, and the subscriber matching device of the multi-protocol label switch system, characterized in that for determining the transmission priority according to the traffic state of the switch fabric. The method according to claim 1 or 2, The traffic shaping processor decomposes the IP packet data received from the AAL5 frame extractor into an ATM cell of 53 bytes at a traffic transfer rate required by the user, and delivers the packet to the transmit physical layer processor. Subscriber matching device. The method according to claim 1 or 2, And the traffic shaping processor delivers the pure ATM cell delivered from the transmitting ATM layer processor to the transmit physical layer processor at a traffic speed desired by the user.