KR100345454B1 - Apparatus and method for managing connection-information in line interface system - Google Patents

Abstract

The present invention relates to an apparatus for managing connection information in a line matching system, a method thereof, and a computer-readable recording medium having recorded thereon a program for realizing the method, and to prevent interleaving of cells by using a VC merging function. Thus, there is provided an apparatus for managing connection information in a line matching system which enables switching of IP packets having the same forwarding group using the same label, and a method and a computer-readable recording medium having recorded thereon a program for realizing the method. In order to provide the first step of receiving the same forwarding group (FEC) information from the operator to generate a table of information about the stream to be delivered to the same forwarding group; Receiving a connection establishment request message from an upper application in which the table is generated, and setting a transmission / reception cell processor and a merging information management table according to the received connection establishment request message; And a third step of delivering a packet to be merged upon reception of a cell on a connection in which virtual channel (VC) merging is required after the setting, and used in a line matching system.

Description

Apparatus and method for managing connection-information in line interface system

The present invention relates to an apparatus for managing connection information in a line matching system, a method thereof, and a computer-readable recording medium having recorded thereon a program for realizing the method. Particularly, the present invention relates to an Asynchronous Transfer Mode (ATM) based MPLS ( Apparatus, method and method for managing connection information in a line matching system that provides VC merging so that IP (Internet Protocol) packets having the same forwarding group can be switched using the same label in a multi-protocol label switching network The present invention relates to a computer-readable recording medium having recorded thereon a program for realizing this.

Multi-Protocol Label Switching (MPLS) network refers to a technology that improves speed by assigning a level to each packet moving through the network and reading only this level from the switch equipment and transmitting the packet. This is a short, fixed-length label. Based on switching, it is used to deliver IP packets at high speed in ATM. At this time, each packet is classified into groups according to the forwarding method, and IP packets belonging to the same forwarding group are attached with the same label and processed. In this case, in ATM, when cells received from multiple virtual channels (VC) are combined into a single virtual channel and inter-leaved when cells of multiple virtual channels are mixed, a problem occurs when the original packet is restored.

Also, ATMs generally do not have the ability to recombine cells without shuffling cells from multiple VCs due to the nature of the connection. Therefore, in order to distinguish streams inputted from multiple VCs, all of them must have an identifier that can be distinguished at the point of integration, which ensures a unique label value for every stream in the MPLS network. Therefore, this has a problem of waste of system resources.

The present invention has been made to solve the above problems, and by using the VC merging function to prevent interleaving of cells, so that IP packets having the same forwarding group can be switched using the same label. An object of the present invention is to provide an apparatus for managing connection information in a line matching system, a method thereof, and a computer-readable recording medium having recorded thereon a program for realizing the method.

That is, the present invention manages each connection information before merging and information for normal packet reconstruction after merging, and provides connection information in a line matching system for providing a merging function, which is a function of preventing interleaving of cells by using such information. It is an object of the present invention to provide a management apparatus, a method thereof, and a computer-readable recording medium having recorded thereon a program for realizing the method.

1 is an exemplary configuration diagram of a line matching system to which the present invention is applied.

2 is a configuration diagram of an embodiment of an apparatus for managing connection information in a line matching system according to the present invention;

3A and 3B are explanatory diagrams of a connection management table for providing a VC merging function in a line matching system according to the present invention;

4 is a flowchart illustrating a method for managing connection information in a line matching system according to the present invention.

* Explanation of symbols for the main parts of the drawings

21: ATM layer processing unit 22: receiving cell processing unit

23: header conversion unit 24: transmission cell processing unit

25: ATM transmitter

The present invention for achieving the above object, in the connection information management apparatus using the VC merging function, the connection between the internal switch included in the header error control (HEC) area of the ATM (Asynchronous Transfer Mode) cell received through the external switch ATM layer processing means for outputting a cell by converting the identifier into a VPI / VCI value for each stream before being received; Assembling the ATM cell delivered from the ATM layer processing means into an Internet Protocol (IP) packet according to the value of VPI / Virtual Path Identification (VCI) / (Virtual Channel Identification) and attaching a reception channel identification value (RCH_ID) to the packet header. Receiving cell processing means for processing; Header conversion means for converting cell packets having the same forwarding group (FEC) into the same FEC identification value according to the identification value (RCH_ID) attached to the packet header transmitted from the receiving cell processing means; Transmitting cell processing means for assembling an IP packet transmitted from the header converting means into an AAL (ATM Adaptation Layer) 5 frame, and dividing the packet into an ATM cell; And ATM cell transmitting means for transmitting each ATM cell received through the transmitting cell processing means to a physical link.

In addition, the present invention, in the connection information management method applied to the connection information management apparatus, the first step of receiving the same forwarding group (FEC) information from the operator to generate an information table for the stream to be delivered to the same forwarding group ; Receiving a connection establishment request message from an upper application in which the table is generated, and setting a transmission / reception cell processor and a merging information management table according to the received connection establishment request message; And a third step of delivering a packet to be merged upon reception of a cell on a connection requiring VC (Virtual Channel) merging after the setting.

In addition, the present invention provides a connection information management device having a processor, the function of generating a table of information about the stream to be received to the same forwarding group by receiving the same FEC information from the operator; Receiving a connection establishment request message from an upper application in which the table is generated, and setting a transmission / reception cell processing unit and a merging information management table according to the received connection establishment request message; And a computer-readable recording medium having recorded thereon a program for realizing a function of delivering a packet to be merged upon reception of a cell on a connection requiring VC (Virtual Channel) merging after the setting.

The present invention provides a VC merging function in a line matching system in order to solve a problem caused by transmitting a packet of the same forwarding group in an ATM-based MPLS network. It features.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a line matching system to which the present invention is applied and performs a VC merging function in an ATM-based MPLS network.

As shown in FIG. 1, the traffic manager 11 has an input buffer and an output buffer at the front and rear of the switch fabric to control traffic. The ATM layer processor 12 performs a user parameter control (UPC) function, an ATM operation and maintenance (OAM) cell extraction and insertion function, and a VPI / Virtual Path Identification (VCI) / Virtual Channel Identification (VCI) lookup function. In addition, the ATM layer processor 12 classifies and transmits a native ATM cell and an IP cell.

The VC merging unit 13 transfers ATM cells of up to 622 Mbps speed transmitted from the switch to the corresponding buffers according to the VC-specific buffer classification, and uses the VCI value to prevent interleaving of cells. This function converts the cell streams belonging to) into the same VCI value.

The traffic shaping unit 14 provides a buffer for absorbing the bursted traffic more than the traffic agreed to for each virtual path (VP) or virtual channel (VC) at the output point of the network. In some cases, traffic may be restricted to comply with agreed traffic.

The physical layer processor 105 restores the ATM cell to a signal input from the physical link, or receives the ATM cell from the traffic shaping unit 14 and transmits the ATM cell to the physical link.

2 is a configuration diagram of an embodiment of a connection information management apparatus in a line matching system according to the present invention.

As shown in FIG. 2, the apparatus for managing connection information in a line matching system according to the present invention may receive a connection identifier between internal switches included in a header error control (HEC) region of an ATM cell received through a switch and be merged. The ATM layer processor 21 for converting the previous VPI / VCI value for each stream to output the cell, and the ATM cell delivered from the ATM layer processor 21 are assembled into IP packets according to the VPI / VCI value and added to the packet header. It has the same forwarding group (FEC) according to the receiving cell processing unit 22 for attaching and processing the receiving channel identification value RCH_ID and the identification value RCH_ID attached to the packet header transmitted from the receiving cell processing unit 22. Assembling an IP packet transmitted from the header converter 23 and the header converter 23 for converting the cell packets into the same FEC identification value into an AAL (ATM Adaptation Layer) 5 frame, and dividing the packet into ATM cells Sending cell for A processing unit 24 and an ATM cell transmitter 25 for transmitting each ATM cell received through the transmitting cell processing unit 24 to the physical link.

At this time, when each cell is output from the transmitting cell processing unit 24, the VPI / VCI value is assigned by the FEC identification value attached to the IP packet header.

3A is an explanatory diagram of a connection management table for providing a VC merging function in a line matching system according to the present invention, and illustrates a description of a local channel management table.

As shown in FIG. 3A, the local channel management table is a data structure for managing a channel generated in each of the transmitting cell processing unit 24 and the receiving cell processing unit 22. Set it.

First, an index field 31 is generated by the maximum number of connections as an identifier for distinguishing each connection.

The channel handle field 32 is a value allocated for channel management in an application and uses a result calculated as a physical port number * VPI value * VCI value of each connection as a channel handle.

Subsequently, the channel ID field 33 is mapped to the channel handle value as a connection identifier managed in the transmitting / receiving cell processing unit.

Finally, the channel state field 34 does not close immediately after the channel closure request if the transmitter / receiver cell processor 24 or 22 desires to close the channel. Manage the state of the channel to close after receiving the recognition of.

3B is a diagram illustrating a connection management table for providing a VC merging function in a line matching system according to the present invention, and illustrates a description of a header translation lookup table.

As shown in FIG. 3B, the header change lookup table is used when the header converter 23 converts the header for VC merging when the cell received by the receiving cell processor 22 is transmitted to the transmitting cell processor 24. do.

First, the channel handle field 35 is an identifier for managing each channel in the application and has a value equal to the channel handle value of the local channel management table. This field is also used as an index into the header translation lookup table.

The encapsulation header field 36 is a value designated by an application when a connection establishment request is made in an encapsulation mode of each cell.

The Gap Counter Field 37 is then designated according to the mode of encapsulation to the number of bytes that must be maintained in the first cell of each packet for the encapsulation data.

Finally, the same forwarding group field (FEC Field) 38 indicates the group to be merged. That is, connections set to the same forwarding group change the output VPI / VCI value to the same value. The output VPI / VCI value for each forwarding group uses the information received from the application.

4 is a flowchart illustrating a method for managing connection information in a line matching system according to the present invention.

As shown in FIG. 4, first, information on the same forwarding group (FEC) is received from an operator (401). A table for each forwarding group (FEC) is generated, that is, an output physical port number and a VPI / VCI value of a packet to be merged and received are received and stored (402).

Subsequently, a connection establishment request message is received from an upper application (403). Here, the connection establishment request message includes source port number / VPI / VCI, destination port number / VPI / VCI, and forwarding group information.

According to the received connection establishment request message, the registers of the transmit / receive cell processing units 24 and 22 are set (404), and the contents of the header conversion lookup table and the local channel management table are set (405 and 406).

The cell then receives 407 that merging is required, i.e., to be delivered on the multipoint-to-point connection. Then, the receiving cell processor 22 assembles the IP packet according to the VPI / VCI value before merging and attaches the reception channel handle value to the packet header (408), and the header conversion unit 23 receiving the packet receives the reception channel. The forwarding group identifier is stored using the handle value as an index of the memory (409), and the transmitting cell processor 24 assembles the received packet into an AAL5 frame, divides the received packet into ATM cells, and transfers the received packet to the physical link (410). Here, the output VPI / VCI value of the cell is assigned by the forwarding group identifier.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention provides a VC merging function for packets belonging to the same forwarding group in a line matching system of an ATM-based MPLS network, thereby preventing cell interleaving of an integrated stream and wasting resources in an ATM network. There is an effect that can efficiently provide IP services while reducing the number.

Claims (9)

In the connection information management apparatus using the VC merging function, To output the cell by receiving the connection identifier between the internal switches included in the header error control (HEC) area of the ATM (Asynchronous Transfer Mode) cell received through the external switch, converting the VPI / VCI value for each stream before merging ATM layer processing means; Assembling the ATM cell delivered from the ATM layer processing means into an Internet Protocol (IP) packet according to the value of VPI / Virtual Path Identification (VCI) / (Virtual Channel Identification) and attaching a reception channel identification value (RCH_ID) to the packet header. Receiving cell processing means for processing; Header conversion means for converting cell packets having the same forwarding group (FEC) into the same FEC identification value according to the identification value (RCH_ID) attached to the packet header transmitted from the receiving cell processing means; Transmitting cell processing means for assembling an IP packet transmitted from the header converting means into an AAL (ATM Adaptation Layer) 5 frame, and dividing the packet into an ATM cell; And ATM cell transmitting means for transmitting each ATM cell received through the transmitting cell processing means to a physical link Connection information management device comprising a. The method of claim 1, The transmission cell processing means, And a VPI / VCI value is assigned according to the FEC identification value attached to the IP packet header when each cell is outputted. A connection information management method applied to a connection information management device. A first step of receiving the same forwarding group (FEC) information from an operator and generating an information table regarding streams to be delivered to the same forwarding group; Receiving a connection establishment request message from an upper application in which the table is generated, and setting a transmission / reception cell processor and a merging information management table according to the received connection establishment request message; And A third step of delivering a packet to be merged upon receiving a cell on a connection requiring virtual channel merging after the setting; Connection information management method comprising a. The method of claim 3, wherein The first step is, And receiving the information on the same forwarding group from the operator, merging each forwarding group, and storing and managing a physical port number and a VPI / VCI value to which a packet to be transmitted is output in a table. The method according to claim 3 or 4, The second step, Receives a connection establishment request message including source port number / VPI / VCI, destination port number / VPI / VCI and forwarding group information from the upper application, and registers the transmit / receive cell processing unit according to the received connection establishment request message. And setting the contents of the local channel management table and the header conversion lookup table. The method of claim 5, The local channel management table, Index field for identifying each connection, channel handle field allocated for channel management by the application, channel ID field mapped to channel handle value with connection identifier managed within the transmit / receive cell processing unit, and transmit / receive cell when the channel is closed. And a channel state field for managing a state of a channel in order to close after receiving the acknowledgment of the transmitting / receiving cell processor instead of immediately closing the channel after requesting the processing unit. The method of claim 5, The header transformation lookup table is The channel handle field having the same value as the channel handle value of the local channel management table as an identifier for managing each channel in the application, and the encapsulation having the value specified in the application when the connection establishment request is made in the encapsulation mode of each cell. And a header field, a gap count field having a number of bytes to be maintained in the first cell of each packet for encapsulation data, and an identical forwarding group field indicating a group to be merged. The method according to claim 3 or 4, The third step, A fourth step of receiving the cell requiring merging, assembling an IP packet according to a VPI / VCI value before merging in a receiving cell processor, attaching a reception channel handle value to a packet header, and delivering the received packet to a header converter; A fifth step of storing a forwarding group identifier by using the received channel handle value as an index of a memory, and transmitting the stored forwarding group identifier to a transmitting cell processor by the header converting unit receiving the forwarded packet; And A sixth step of assembling the packet received by the transmitting cell processor into an AAL5 frame, dividing the packet into an ATM cell, and delivering the packet to a physical link Connection information management method comprising a. In the connection information management device having a processor, Receiving information of the same forwarding group (FEC) from an operator and generating a table of information about streams to be delivered to the same forwarding group; Receiving a connection establishment request message from an upper application in which the table is generated, and setting a transmission / reception cell processing unit and a merging information management table according to the received connection establishment request message; And A function of delivering a packet to be merged upon reception of a cell on a connection requiring VC (virtual channel) merging after the setting. A computer-readable recording medium having recorded thereon a program for realizing this.