KR100388066B1 - Extended Label Switched Path Setup Method in MPLS System with IP Packet Forwarding Engines - Google Patents

Abstract

The present invention relates to a method for establishing an extended label switched path of an Internet packet to be received by a plurality of Internet Protocol packet forwarding engines in an ATM switch which is the basis of a high-speed public telecommunication network. Multiprotocol Label Switching System with Multiple Internet Protocol Packet Forwarding Engines for Attempting Extended Label Switched Routing in Multiprotocol Label Switching Systems with Label Switch Pathing Essentials for Internet Packet Transmission and Multiple Internet Protocol Packet Forwarding Engines Providing a method for extended label switched routing in a network, a label switching scheme that can provide Internet services in a high-speed public network is implemented as a function in the exchange. Standing there for you to contribute to your Internet service provider.

Description

Extended Label Switched Path Setup Method in MPLS System with IP Packet Forwarding Engines in Multiprotocol Label Switching Systems with Multiple Internet Protocol Packet Forwarding Engines

The present invention relates to a method for establishing an extended label switched path of an Internet packet to be received by a plurality of Internet Protocol packet forwarding engines in an Asynchronous Exchange Mode (ATM) exchange that is the basis of a high-speed public telecommunication network. An important factor is a multi-protocol label switching system with label switch routing, which is essential for Internet packet transmission at the exchange, and multiple Internet protocol packet forwarding engines. An extended label switched routing method in a protocol label switching system.

In general, the Internet has been implemented and used in existing private networks, and its functions have not been ported to exchanges. Therefore, the structure and implementation method of various functions dependent on the exchange could not but be implemented with different technologies and design techniques depending on the transplantation method.

Therefore, in the past, there is a technology for processing Internet data packets inputted through a point-to-point protocol (PPP) access subscriber at a switch or through a relay line for each protocol. This technique is different from the routing control method in ATM and is not suitable for the high-speed information communication network.

In addition, by setting label switched paths to a plurality of Internet protocol packet forwarding engines, it is possible to deliver Internet protocol packets at high speed in a label edge router (LER) of multi-protocol label switching, but to set label switched paths in a multi-protocol label switching network. Is set only within the multi-protocol label switching area, so the extended label switched path to the I / O internet protocol forwarding engine in the multi-protocol label switching LER system is established.

In this case, the extended label switched path setting may be performed by selecting a input / output Internet protocol forwarding engine corresponding to the non-multiprotocol label switching area in the routing information after the label distribution protocol establishes the label switched path in the multiprotocol label switching area. An extended label switched path must be established to the I / O interface within the LER system.

Therefore, there is a need for a technology that can easily manage and access routing information in a non-multi-protocol label switching area and a technique for extending a label switched path in a multi-protocol label switching area to an Internet protocol packet forwarding engine using a label distribution protocol. Occurred.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is a non-multi in a multi-protocol label switching system equipped with a plurality of Internet protocol packet forwarding engines and label switch routing necessary for Internet packet transmission in an exchange that is an important factor for Internet access. An extended label switched path setting method in a multi-protocol label switching system equipped with a plurality of Internet protocol packet forwarding engines for extending and configuring a label switched path to a protocol label switching area.

1 is a structure diagram of a multi-protocol label switching system equipped with a plurality of Internet protocol packet forwarding engines to which the present invention is applied.

2 is a block diagram of a software control block to which the present invention is applied.

3A and 3B illustrate an extended label switched path setting method according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: multiprotocol label switching network

200: HANbit ACE 64 Multiprotocol Label Switching Switch

300: non-multiprotocol label switching network

400: Routing Control Processor (RCP)

500: subscriber and network registration device in a multiprotocol label switching system

600: RCP in a multiprotocol label switching system

700: Internet Protocol Packet Forwarding Engine in a Multiprotocol Label Switching System

800: call processing device in a multi-protocol label switching system

Extended label switched path setting method in a multi-protocol label switching system equipped with a plurality of Internet protocol packet forwarding engine according to the present invention for achieving the above object is provided with a plurality of Internet protocol forwarding engine and a plurality of label switched exchange 12. A method for establishing a label switched path in a multiprotocol label switching system having an exchange switch for allocating a data transmission path between the Internet protocol forwarding engines and label switched exchanges, wherein the label distribution protocol control block comprises a multiprotocol label switching. A first step of requesting the establishment of a label switched path using the neighbor information when receiving the address of the destination, which is the neighbor information of the network, and the masking information of the destination; When the label distribution protocol control block receives the label mapping information according to the request of the first step, it sets an extended label switched channel in the Internet packet forwarding engine and the LC-ATM, and sets a destination address and an address in the Internet packet forwarding engine. Transmitting an internal channel of the Internet packet forwarding engine as mapping information, and transmitting, to the LC-ATM side, information on the extended label switched channel and mapping information on the label switched channel as merging information; Establishing an extended label switch channel between a plurality of the LC-ATM and a specific Internet protocol forwarding engine by setting up channel information promised with a router to connect a router or subscriber of a non-labeled switching network using the internet forwarding engine. Three steps; And when the routing processor receives the routing information through the internet packet forwarding engine, maps the routing information and the extended label switching channel to the LC-ATM side, and uses the extended packet channel of the internet packet forwarding engine as the internet packet forwarding engine. And a fourth step of delivering the information and the router and the promised channel information of the Internet packet forwarding engine as merging information. The above object and various advantages of the present invention are provided by those skilled in the art. With reference to the accompanying drawings will be more apparent from the preferred embodiment of the invention described below.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a structural diagram of a multi-protocol label switching system equipped with a plurality of Internet protocol packet forwarding engines to which the present invention is applied.

The multiprotocol label switching network 200 and the multiprotocol label switching network 100 and a non multiprotocol label switching network 300 are connected, and in particular, the network includes the Internet.

The multiprotocol label switching system comprises a Labeled Control (LC) -ATM matching device (A1), an ATM matching device (A2), a plurality of Internet protocol packet forwarding engines (A3, A4, A5, A6), a routing processor (400) and ATM switch A7 is included.

A label switched path is a connection setup to an LC-ATM device connected to a multiprotocol label switching network, and an extended label switched path is a connection setup to a corresponding Internet protocol packet forwarding engine in addition to the path. The label distribution protocol and the routing protocol required for such label switched routing are performed in the routing processor.

2 is a block diagram of a multi-protocol label switching software control block to which the present invention is applied.

The routing control processor (RCP) 400 processes the label control messages for label switching control and also processes the control messages for routing. These messages are sent and received via a multiprotocol label switching network. It is also connected to the call processing device 800 for interworking with the call processing.

The software control block 600 in the routing control processor (RCP) is a routing information entry block (hereinafter referred to as RIEF) that performs a function of processing various routing protocols for generating routing information necessary for internet routing. (B2), a Label Distribution Protocol Control Function Block (hereinafter referred to as LDPCF) (B3) having a function for performing a label distribution protocol and controlling label mapping, and at the LDPCF (B3). It consists of a General Switch Management Protocol Handling Function Block (hereinafter referred to as GSMPHF) B4 that performs a function for handling a label mapping request, and a call processing device software block.

In addition, the Internet Packet Forwarding Management Function Block (B5) in the Internet Protocol Forwarding Engine 800 receives extension label information from the LDPCF B3 to manage extension label information necessary for Internet protocol packet transmission. Block.

In addition, the call processing apparatus 800 converts the extended label information into system dependent connection information and transmits the corresponding information to the MPLS Basic Rate Interface Function Block (B1). At this time, the Basic Rate Interface Function Block (BSO) and the MBSIF (B1) perform ATM cell switching.

In the extended label switched path setting method according to the present invention configured as described above, FIG. 3A relates to a method of setting an extended label switched path on the multi-protocol label switching LER ingress side, and FIG. A method for setting an extended label switched path on the grass side.

Referring to the accompanying FIG. 3A, an extension within a multiprotocol label switching system between the N Internet protocol forwarding engines C2, C3, C4 and C5 and the label switched path C7 to the multiprotocol label switching region C6 is provided. Label switched paths generate N paths to establish N extended label switched paths C1. At this point, the LC-ATM device C6 must have a merging function.

In more detail, when the neighbor information about the multi-protocol label switching network is received by communicating with an adjacent routing protocol block, the routing information entry block (RIEF) stores the neighbor information of the network in the label distribution protocol control block (LDPCF). To pass. In this case, the transmitted neighbor information includes an address of a destination and masking information about the destination. The LDPCF block requests the establishment of a label switched path using the neighbor information and receives label mapping information connected to the LC-ATM as a result. Using the label-mapped information, an extended label switched channel is set in the Internet packet forwarding engine and the LC-ATM by a general switch management protocol processing block (GSMPHF), and a destination address and an Internet packet forwarding are set in the Internet packet forwarding engine. Pass internal channel of engine as mapping information. In addition, the LC-ATM side transfers information on the extended label switched channel and mapping information on the label switched channel as merging information. This process is passed to one specific LC-ATM and multiple Internet packet forwarding engines. Subsequently, the Internet packet inputted to the Internet packet forwarding engine determines the extended label switched path based on the address of the Internet packet, and the Internet packet that is switched with the determined extended label and arrives at the LC-ATM has the extended label switch channel. The label switch path is found, merged, and forwarded to the label switch path of the LC-ATM. Referring to FIG. 3B, the process of setting an extended label switched path in the case of egress is illustrated by N Internet Protocol Forwarding Engines (D2, D3, and D4). In the multiprotocol label switching system between D5) and the label switched path (D7) to the multiprotocol label switching area (D6), the extended label switched path selects (D2) the destination-specific Internet protocol forwarding engine for routing information. Extended label switch to protocol forwarding engine (D2) The route path (D1), i.e., by using the Internet forwarding engine to set up the router and the promised channel information to connect the router or subscriber in the non-labeled switching network, between the LC-ATM and a specific Internet protocol forwarding engine. After the extended label switch channel is set, the routing processor receives the routing information from the RIEF block through the Internet packet forwarding engine, and maps the routing information and the extended label switching channel to the LC-ATM side. Next, the extended label channel information of the Internet packet forwarding engine and the channel information promised with the router of the Internet packet forwarding engine are delivered as merging information. Subsequently, the Internet packet input to the LC-ATM is determined by the extended label information of the LC-ATM based on the destination address of the header, and forwarded to the Internet packet forwarding engine, and the Internet packet arriving at the Internet packet forwarding engine through the extended label channel is It is merged with a router and a promised channel and is delivered to a non-labeled switching network.

While the invention has been shown and described in connection with specific embodiments thereof, it will be appreciated that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

As described above, when the extended label switched routing method is provided in a multi-protocol label switching system equipped with a plurality of Internet protocol packet forwarding engines according to the present invention, a label switching scheme for smoothly providing Internet services in a high-speed public network is provided. Implementing as a function within the exchange can help to provide Internet services in high-speed public networks in the future.

In addition, the present invention helps to improve performance in a system by establishing an extended label switched path in a multiprotocol label switching system.

Claims (2)

Setting a label switched path in a multiprotocol label switching system having a plurality of internet protocol forwarding engines and a plurality of label switched exchanges and an exchange switch for allocating a data transmission path between the internet protocol forwarding engines and the label switched exchanges. In the way, A first step of requesting the establishment of a label switched path using the neighbor information when the label distribution protocol control block receives the address of the destination and the masking information on the destination that are the neighbor information of the multi-protocol label switching network; When the label distribution protocol control block receives the label mapping information according to the request of the first step, it sets an extended label switched channel in the Internet packet forwarding engine and the LC-ATM, and sets a destination address and an address in the Internet packet forwarding engine. Transmitting an internal channel of the Internet packet forwarding engine as mapping information, and transmitting, to the LC-ATM side, information on the extended label switched channel and mapping information on the label switched channel as merging information; Establishing an extended label switch channel between a plurality of the LC-ATM and a specific Internet protocol forwarding engine by setting up channel information promised with a router to connect a router or subscriber of a non-labeled switching network using the internet forwarding engine. Three steps; And When the routing processor receives the routing information through the internet packet forwarding engine, the routing processor maps the routing information and the extended label switching channel to the LC-ATM side, and the extended packet channel information of the internet packet forwarding engine is used as the internet packet forwarding engine. And a fourth step of delivering the channel information promised with the router of the internet packet forwarding engine as merging information. Way. (delete)