KR20020069452A - Method for point to point protocol support for asynchronous transfer mode system - Google Patents

Abstract

PURPOSE: A method for supporting a PPP(Point-to-Point Protocol) in an ATM system is provided to embody a PPP software stack at a frame relay interface unit in an ATM system so that the ATM system can support a PPP function. CONSTITUTION: If a frame signal is received from an HDLC(High Level Data Link Control) controller(300), a frame relay interface unit judges whether the received message is a control message(301). In case that the received PPP frame signal is a control message, the frame relay interface unit transmits the control message to a PPP stack(302). Meanwhile, if the received PPP frame signal is a data message, the frame relay interface unit removes the packet header through a PPP packet handler and inserts an IP(Internet Protocol) header(303). Then the frame relay interface unit transmits the IP-inserted PPP data to an ATM adaptive layer(304).

Description

Method for point to point protocol support for asynchronous transfer mode system

The present invention relates to a method for supporting a point-to-point protocol in an asynchronous transmission mode system. More particularly, the present invention relates to a method for supporting a point-to-point protocol in an asynchronous transmission mode system. It is about.

With the recent proliferation of the Internet, most hosts are tied up through different types of local area networks (LANs), with the rest forming public networks over long-distance networks (WANs) such as X.25.

As a protocol between the long-distance network (WAN) section, the point-to-point protocol (PPP), a standard protocol established by the IETF to carry TCP / IP, which is an Internet protocol, on a serial line, was a serial line that was a de facto standard It is rated as superior to the Internet Protocol (SLIP).

This is because Point-to-Point Protocol (PPP) operates independently of the transmission medium, so it can handle not only asynchronous but also synchronous communication.

The Point-to-Point Protocol (PPP) can share a single line with other users and has an error detection function not found in the Serial Line Internet Protocol (SLIP).

The Point-to-Point Protocol (PPP) was originally designed to transmit Internet Protocol (IP), but supports various network protocols such as Internet Packet Exchange (IPX) and DEC net.

As such, the point-to-point protocol (PPP) supporting various network protocols is not implemented in the frame relay interface device of the conventional asynchronous transmission mode system.

Accordingly, an object of the present invention is to softly implement a point-to-point protocol stack in a frame relay interface device of an asynchronous transmission mode system to support the point-to-point protocol function in an asynchronous transmission mode system.

In order to achieve the above object, the present invention includes the steps of determining whether a frame signal received from a higher level data link controller is a point-to-point frame control message; Transmitting the point-to-point protocol stack, which is a point-to-point protocol device, when the point-to-point frame received in the step is a control message; If the point-to-point frame received in the step is a data message, removing the point-to-point packet header and inserting an Internet Protocol (IP) header; And transmitting the point-to-point protocol data into which the Internet Protocol (IP) is inserted to the asynchronous transmission mode application layer.

1 is a block-to-point protocol support block diagram of a frame relay interface device of the asynchronous transmission mode system of the present invention.

2 is a detailed block diagram of the point-to-point protocol of the frame relay interface device of the asynchronous transmission mode system of the present invention.

3 is a flowchart of a point-to-point protocol of a frame relay interface device of the asynchronous transmission mode system of the present invention.

* Explanation of symbols for the main parts of the drawings *

10; High-level data link controller

20; Frame relay interface device

21; Main loop of frame relay interface unit

22; Point-to-Point Protocol Control Packet Headers

23; Point-to-Point Protocol Service-Specific Transform Sublayer

30; Asynchronous transfer mode enforcement layer

40; Point-to-Point Protocol Stack

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention.

1 is a frame relay interface device of the asynchronous transmission mode system of the present invention

2 is a block-to-point protocol support block diagram of the frame relay interface device of the asynchronous transmission mode system of the present invention, wherein the switched virtual connection management (SVCM) 11 and the switched virtual connection stack ( 12) a higher data link controller (HDLC) by a control signal to a fixed virtual access management (PVCM) 13, a simple network management protocol subagent (SNMP) 14, and a configuration management subagent (CM) 15; In the asynchronous transmission mode system for transmitting the data of the " 10 " to the asynchronous transmission mode application layer 30 through the frame relay interface device 20, the configuration management subagent 15 is connected to the frame relay interface device 20. And applying the point-to-point frame received to the upper level data link controller 10 by a control signal from a simple network management protocol subagent 14 to the asynchronous transmission mode. It constitutes a point-to-point protocol stack 40 that performs an interface to layer 30.

The frame relay interface device 20 includes a frame relay interface main loop 21 for interfacing data from a higher level data link controller 10; A point-to-point protocol packet handler 22 for controlling the point-to-point protocol stack 40 and messages; The frame relay interface main loop 21 is composed of a point-to-point protocol service specific transformation sublayer 23 for converting and interfacing data to the asynchronous transmission mode adaptation layer 30.

3 is a point-to-point protocol flowchart of a frame relay interface device of the asynchronous transmission mode system of the present invention, comprising: receiving a frame signal from a high level data link controller 10; In the frame relay interface device 20, the point-to-point frame received in step 300 determines whether a control message is applied (301); When the point-to-point frame received in the step 301 is a control message, the frame relay interface device 20 transmits the point-to-point protocol stack 40 to the point-to-point protocol stack 40; If the point-to-point frame received in step 301 is not a control message but a data message, the frame relay interface device 20 removes the packet header with a point-to-point packet handler and inserts an Internet Protocol (IP) header. 303; In step 304, the point-to-point protocol data into which the Internet Protocol (IP) is inserted is transmitted to the asynchronous transmission mode application layer (30).

According to the present invention made as described above, the configuration management subagent 15 performs the exchange virtual connection management 11 and the fixed virtual connection management 12 while the operation of the point-to-point protocol stack 40 is started. Format port configuration data for each device. The point-to-point protocol port is configured in the point-to-point protocol stack 40 by the configuration management subagent 15.

At this time, if there is a change in the port configuration of the point-to-point protocol stack 40, the configuration management subagent 15 formats the point-to-point protocol port configuration and transmits it to the point-to-point protocol stack 40.

While configuring the port in the point-to-point protocol device 40, the frame relay interface device 20 installs a specific function for processing the point-to-point protocol frame.

Subsequently, when the point-to-point protocol frame signal received from the port of the upper level data link controller 10 is received in the frame relay interface device 20 in which the specific function for the point-to-point protocol frame processing is installed (step 300), Since the signal may be a control or a data frame, the frame relay interface device 20 determines whether the received frame is a control message (step 301).

At this time, if the frame received by the higher-level data link controller 10 is a control message, the frame relay interface main loop 21 of the frame relay interface device 20 provides high performance through the point-to-point protocol packet handler 22. In order to transmit the point-to-point protocol control frame to the point-to-point protocol stack 40 (step 302).

At this time, if the frame received by the higher level data link controller 10 is not a control message but a data message, the frame relay interface device 20 does not transmit the frame data to the point-to-point protocol signal stack 40, and the frame The point-to-point protocol header is removed in the relay interface device 20 and the Internet protocol (IP) header is inserted into the point-to-point protocol service specific translation sublayer 23 (step 303).

Thereafter, the frame relay interface device 20 transmits the point-to-point protocol data to the asynchronous transmission mode application layer 30 (step 304).

On the contrary, when the data is transmitted from the asynchronous transmission mode application layer 30 to the upper level data link controller 10, the Internet protocol (IP) header received from the asynchronous transmission mode application layer 30 is the frame relay interface device 20. A point-to-point protocol service specific translation sublayer 23 within is converted into a point-to-point protocol header and transmitted to the higher level data link controller 10.

As described above, the present invention provides an asynchronous transmission mode system in which a point-to-point protocol signal stack for interfacing the point-to-point protocol data received from a higher-level data link controller to an asynchronous transmission mode application layer is asynchronous. It can provide the effect that can support the point-to-point protocol in the transmission mode system.

Claims (1)

Determining whether a frame signal received from a higher level data link controller is a point-to-point frame control message; Transmitting the point-to-point protocol stack, which is a point-to-point protocol device, when the point-to-point frame received in the step is a control message; If the point-to-point frame received in the step is a data message, removing the point-to-point packet header and inserting an Internet Protocol (IP) header; And transmitting the point-to-point protocol data inserted with the internet protocol (IP) to the asynchronous transmission mode application layer.