KR100429908B1 - Apparatus for controlling label Distibution in MPLS/GMPLS network - Google Patents

Abstract

The present invention provides a control block of a next-generation Internet equipment by providing a configuration of a label distribution control device (LDCF) in a multi-protocol label switching (MPLS) / Generalized MPLS (GMPLS) network and an interprocessing operation method among the elements constituting the device. The present invention relates to a label distribution control device in an MPLS / GMPLS network that can be improved in design and implementation.

The present invention for this purpose, a port manager (Port Manager) for the port management, a connection manager (Connection Manager) for connection management, a Label Manager (Label Manager) for label management centering around LDCF, a label distribution control block Routing Information Base (RIB) generated by routing protocol, Traffic Engineering Manager (TE Manger) to provide traffic engineering function, Simple Network Management Protocol Agent (SNMP Agent) to provide network management function Command manager for providing operator commands, IP interface / TCP interface / UDP interface for sending and receiving protocol control messages, memory manager for memory management, and And a timer manager for related processing.

Description

Apparatus for controlling label Distibution in MPLS / GMPLS network}

The present invention provides a label distribution control device for label distribution in a control component of a system to which MPLS (Multi Protocol Label Switching) (MPLS) / GMPLS (Generalized MPLS, hereinafter referred to as GMPLS) technology is applied. Block (hereinafter referred to as 'LDCF'), and more specifically, by providing a method of mutual processing operation between the components of the LDCF and the components constituting the device, it is easy to design and implement a control block of next-generation Internet equipment. A label distribution control device (LDCF) in an MPLS / GMPLS network that can be improved.

In general, MPLS technology began by separating data forwarding and routing to achieve the scalability and flexibility of Layer 3 routing, and the high performance and traffic management capabilities of Layer 2 switching. This MPLS technology is standardized under the name GMPLS (Generalized MPLS) as an integrated control component that supports not only packet switching but also time-division switching, wavelength switching, and spatial (Fiber) switching. Is in progress. The MPLS / GMPLS technology is receiving more attention while providing various applications for controlling the Internet. Two representative applications are virtual private network (VPN) services and traffic engineering services. VPN service is a number of private services that provide network scalability, stability, flexibility, and security while sharing the network resources of service providers (SPs) on behalf of the services provided by existing leased lines. This is a service that connects network (Private Network) sites.

The MPLS / GMPLS technology is a standardized technology that has been proposed to compensate for many of the shortcomings of the IP technology, which was the main technology of the existing Internet. Since the conventional IP technology basically provides only best-effort service by routing, only pure IP technology currently requires QoS (Quality of Service) / CoS (Class of Service) required for multimedia traffic transmission. That is, they cannot provide services with a certain level of quality. In addition, routing based on all IP technologies finds all routing prioritizing only the shortest path by the shortest path first rule, and thus cannot operate an efficient network. In addition, when a certain node or a link of a network fails, it takes a long time to detect and detour to another path by a routing protocol, which has disadvantages in stable operation of the network.

In contrast, MPLS / GMPLS technology, unlike typical conventional IP technology, uses network engineering (TE) service that can designate a specific route for each pass, and efficiently uses network resources. There is an advantage that QoS / CoS can be supported by setting different QoS / CoS semantics for each LSP. This has the advantage that it can support differentiated service (DiffServ) using MPLS / GMPLS technology and can also support TE for network efficiency. In addition, it is possible to operate the network stably by setting a bypass LSP to each LSP in preparation for a failure of a specific node or a specific link.

The basic idea behind MPLS is to perform label swapping by forwarding different control modules together. Here, the control module may be a basic unicast routing module, a traffic engineering module, or the like. Label Switched Path (LSP), which is a connection in the MPLS network, is connected to Label Distribution Protocol (LDP), Constraint-based Routing LDP (CR-LDP), or Resorce Reservation Protocol-Traffic Engineering (RSVP-TE). The packet forwarding in the LSP can be efficiently and quickly transmitted in three layers by using a short header called a label. Here, the label is a Virtual Path Identifier (VPI) / Virtual Channel Identifier (VCI), DLCI of FR (FrameRelay), or timeslot, depending on the switching type of the system with MPLS / GMPLS technology. (Timeslot), wavelength (Wavelength), fiber (Fiber) and the like.

The technical problem to be solved by the present invention is to compensate for the shortcomings of IP, which is a technology of the current Internet, and to design a control component of an MPLS / GMPLS system applicable to various switching systems to be developed to satisfy user requirements. An object of the present invention is to provide a generalized configuration of LDCF, which is a control device for label distribution, and to provide a method of mutual processing between the elements constituting the device.

1 is a conceptual diagram of a Generalized Multi Protocol Label Switching (GMPLS) technique composed of various switching types associated with the present invention.

Figure 2 is a block diagram showing the configuration of a control device for label distribution in the GMPLS network (or network) of the present invention.

3 is a conceptual diagram showing a protocol that can be applied for label distribution in the GMPLS network of the present invention.

4 is a view for explaining the operation between the components of the control device for label distribution in the GMPLS network of the present invention.

500: label distribution control block 502: port manager

504: connection manager 506: label manager

508: Routing Information Base (RIB) 512: Traffic Engineering Manager

514: SNMP Agent 516: Command Manager

521: IP interface 522: TCP interface

523: UDP interface 524: memory manager

525: Timer Manager

In order to achieve the above object, a label distribution controller (LDCF) for label distribution in a control component of a system to which MPLS / GMPLS technology is applied according to the present invention is a port manager for port management based on LDCF, which is a label distribution control block. Port Manager); A connection manager for connection management; A label manager for label management; A Routing Information Base (RIB) generated by a routing protocol; A traffic engineering manager (TE Manger) for providing a traffic engineering function; A simple network management protocol agent (SNMP Agent) for providing a network management function; A command manager for providing operator commands; An IP interface / TCP interface / UDP interface for transmitting and receiving protocol control messages; A memory manager for memory management; Its feature is that it includes a timer manager for periodic tasks and time-related processing.

In a preferred embodiment of the present invention, the protocol for the label distribution block is LDP (Label Distribution Protocol) based on routing protocol, Constraint-based Routing LDP (CR-LDP) or RSVP-TE (Resorce) based on traffic engineering. Reservation Protcol-Traffic Engineering) can be applied.

In a preferred embodiment of the present invention, the label distribution control block waits for a port up / down event from the port manager, and when a port up event occurs, performs a label request and distribution according to the setting to the corresponding port, If the port down event occurs, label revocation to terminate the LSP to the corresponding port; Requesting connection establishment and termination from the connection manager according to the transmitted and received label information, and receiving a corresponding result; The label manager, which is a label management block for label distribution / label revocation, requests label assignment and revocation, and receives a designated label or a corresponding result from the label manager.

In the preferred embodiment of the present invention, if the label distribution control block is performed with routing based LDP, it waits for the RIB update event information and then transmits a label request or revocation to a proximity system according to the addition / deletion of a specific route. and; When the LSP is deleted due to the termination / resetting of the LDP interface of the intermediate LSR, the label distribution control block periodically searches the RIB and sends a label request to the unconfigured route in order to reset the LSP without deleting the route. and; In order to set up a QoS-guaranteed LSP and to provide a traffic engineering service, the traffic engineering manager may receive the constraint information of the operator's request and transmit the received constraint information to the label distribution control block. According to the information and the path (Path), the label request and distribution to the proximity system using the CR-LDP or RSVP-TE is performed to set the required LSP.

In a preferred embodiment of the present invention, if the label distribution information is modified for network management, the label distribution control block forwards the information to the SNMP agent as a trap; When the initial label distribution information is required in the SNMP agent for the network management, when the label distribution control block requests the corresponding information, the label distribution control block delivers the required information; When an operator inputs a command through the command manager for system management, the operator delivers the command to the label distribution control block to execute the corresponding command and transmit a result to the command manager.

In a preferred embodiment of the present invention, the label distribution control block has an IP / TCP / UDP interface according to a signaling protocol applied for basic protocol control message communication with a proximity system and transmits and receives a corresponding message. Here, LDP / CR-LDP protocol has a UDP interface for sending and receiving Hello messages for peer discovery, and a TCP interface for sending and receiving LDP / CR-LDP messages other than Hello messages. This sends and receives the corresponding protocol message. In addition, the RSVP-TE protocol has an IP interface for transmitting and receiving protocol messages and transmits and receives corresponding messages. Then, the label distribution control block has a memory manager that manages the memory required for processing and allocates (Malloc) and frees the memory therefrom. In addition, the label distribution control block needs to perform a processing routine related to periodic processing and time, and for this purpose, a timer manager is provided and waits for a periodic timer event therefrom, and performs a processing routine required for the corresponding timer event. .

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the label distribution control device in the MPLS / GMPLS network according to the present invention. In the following description of the present invention, when it is determined that detailed descriptions of related well-known technologies or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary depending on intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

First, the present invention relates to a configuration of a label distribution device of a GMPLS system that provides a generalized control component in various switching systems, including an MPLS system, and a method of mutual processing operation between the components of the device. .

1, GMPLS (200) technology related to the present invention is an ATM switch, a FrameRelay Switch (FrameRelay Switch) and the like to provide a packet-switching capable (PSC) interface 110 to which the MPLS (100) technology is applied; SDH / SONET Cross Connector, ADM equipment which provides a Time-Division Multiplex Capable (TDM) interface 20 here; A wavelength switch for providing a Lambda Switch Capable (LSC) interface 30; It is a generalized control technology applicable to Photonic Cross Connector (FSC) that provides a Fiber-Switch Capable (FSC) interface 40.

The present invention provides the components as shown in FIG. 2 as components of a control device for label distribution in such a generalized control component. Referring to FIG. 2, a label distribution control block (LDCF) 500 for label distribution is first provided. ), Port manager 502, connection manager 504, label manager 506, RIB 508, traffic engineering manager 512, Simple Network Management Protocol (SNMP) agent 514, command manager 516. And an OS-dependent IP interface 521, a TCP interface 522, a UDP interface 523, a memory manager 524, and a timer manager 525.

In the present invention, the label distribution control block 500 is a routing protocol-based Label Distribution Protocol (LDP) 310 and a traffic engineering based CR-LDP (Constraint-based Routing LDP) 320, as shown in FIG. RSVP-TE (Resorce Reservation Protcol-Traffic Engineering) 330 is applicable.

The interaction between the above-described components for label distribution according to the present invention will be described with reference to FIG.

In the label distribution control apparatus of the present invention, first, a port manager 502 is required for port state management, and the port manager 502 may apply a separate state management block, and the GSMP performs state management of the port. Status information may be transmitted to the label distribution control block 500 through the General Switching Management Protocol. The label distribution control block 500 waits for a port up / down event from the port manager 502, and when a port up event occurs, performs a label request and distribution according to the setting to the corresponding port. When a port down event occurs, label revocation is performed to release the LSP to the corresponding port.

In addition, in order to set up the LSP according to the information of the distribution received label, the connection manager 504, which is a connection management block, requests to establish and terminate the switch connection and receives the result. The connection manager 504 is applicable to the GSMP performing the connection management of the port.

Then, the label manager 506 which performs label resource management performs label allocation (Alloc) and release (DeAlloc) according to the request of the label distribution control block 500, and delivers a result related to a specified label or label cancellation. . However, the label managed by the label manager 506 may be VPI / VCI of ATM, DLCI of FR (FrameRelay), or timeslot, wavelength, and fiber (depending on the switching method of the system to which the control device is applied). Fiber).

As shown in FIG. 3, the protocol applicable to the label distribution control block may be largely a routing-based LDP, a traffic engineering-based CR-LDP, and an RSVP-TE. In this case, the routing-based LDP sets and terminates the LSP according to the changed information of the routing entry. Based on this, the label request and the label distribution are performed to the proximity system. Routing Information Base (RIB) 508, which is the basis of such LDP operation, is configured by a routing protocol. To this end, the LDCF waits for RIB update event information and then sends a label request or revocation to a neighboring system according to the addition / deletion of a specific route. In addition, when the LSP is deleted due to the termination and resetting of the interface of the intermediate LSR, the LSP is deleted without changing the route. Thus, the label distribution control block periodically searches the RIB and sends a label request to the unconfigured route to reset the LSP. .

And, to set up the QoS-guaranteed LSP, to provide a traffic engineering service, the traffic engineering manager 512 is provided, and receives the constraint information of the operator's request through the label distribution control block 500 through this. Then, the label request and distribution is performed to the proximity system using the CR-LDP or RSVP-TE according to the constraint information and the path information to set the required LSP.

In addition, for network management, when the label distribution information is modified, the label distribution control block 500 transmits the information to the SNMP agent 514 as a trap. In addition, when the initial label distribution information is required in the SNMP agent 514, when the label distribution control block 500 requests the corresponding information, the label distribution control block 500 delivers the required information.

In the system to which the label distribution control apparatus 500 is applied, a command manager 516 is essential for system management. When a command is input, the command is transmitted to the label distribution control block 500 to perform the corresponding command and output the result. Transfer to command manager 516.

In addition, for basic control message communication with the proximity system, the label distribution control block 500 has IP / TCP / UDP interfaces 521, 522, and 523 according to a protocol to transmit and receive the corresponding message. Here, the LDP / CR-LDP protocol has a UDP interface 523 to send and receive Hello messages for peer discovery, and a TCP interface to send and receive LDP / CR-LDP messages other than Hello messages. 522, which transmits and receives a corresponding protocol message. In addition, the RSVP-TE protocol has an IP interface 521 to transmit and receive protocol messages.

Then, the label distribution control block has a memory manager 524 that manages the memory required for processing, and allocates (Malloc) / frees the memory therefrom.

In addition, the label distribution control block 500 needs to perform periodic processing and processing routines related to time, and for this purpose, a timer manager 525 is provided to wait for periodic timer events therefrom and request for the corresponding timer events. The processing routine.

The label distribution controller for label distribution in the control component of the system to which the MPLS / GMPLS technology according to the present invention as described above is applied includes the GMPLS technology that provides generalized control components in various switching systems including the MPLS system. By providing a general configuration of a label distributing device generalized in a system and a method of mutual processing operation between components of the device, it is easy to design and implement a control block of next-generation Internet equipment.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains may make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Therefore, changes in the future embodiments of the present invention will not be able to escape the technology of the present invention.

Claims (6)

In a label distribution controller (LDCF) for label distribution in a control component of a system applying MPLS / GMPLS technology, Created by a port manager for port management, a connection manager for connection management, a label manager for label management, and a routing protocol around LDCF, a label distribution control block Routing Information Base (RIB), Traffic Engineering Manager (TE Manger) to provide traffic engineering functions, Simple Network Management Protocol Agent (SNMP Agent) to provide network management functions, and operator commands Command Manager for PC, IP / TCP / UDP Interface for Sending / Receiving Protocol Control Message, Memory Manager for Memory Management, Timer for Processing Related to Periodic Jobs and Times Label distribution control device in the MPLS / GMPLS network characterized in that it comprises a Timer Manager (Timer Manager). According to claim 1, The protocol for the label distribution block is a routing protocol based LDP (Label Distribution Protocol), traffic engineering based CR-LDP (Constraint-based Routing LDP) or RSVP-TE (Resorce Reservation Protcol- Label distribution control device in the MPLS / GMPLS network characterized in that it can be applied to (Traffic Engineering). The method of claim 1, wherein the label distribution control block, Waiting for a port up / down event from the port manager, if a port up event occurs, label request and distribution is performed according to the setting to the corresponding port, and if a port down event occurs, the label is released to release the LSP to the corresponding port. Perform; Requesting connection establishment and termination from the connection manager according to the transmitted and received label information, and receiving a corresponding result; Label distribution control device in the MPLS / GMPLS network characterized in that the label management block to the label manager, the label management block for label distribution / label revocation, and receives the specified label or the result from the label manager . 2. The method of claim 1, wherein when the label distribution control block is performed with routing based LDP, it waits for the RIB update event information and then sends a label request or revocation to a proximity system according to the addition / deletion of a specific route; When the LSP is deleted due to the termination / resetting of the LDP interface of the intermediate LSR, the label distribution control block periodically searches the RIB and sends a label request to the unconfigured route in order to reset the LSP without deleting the route. and; In order to set up a QoS-guaranteed LSP and to provide a traffic engineering service, the traffic engineering manager may receive the constraint information of the operator's request and transmit the received constraint information to the label distribution control block. Label distribution control device in MPLS / GMPLS network characterized in that to set the required LSP by performing the label request and distribution to the proximity system using the CR-LDP or RSVP-TE according to the information and path information . The method of claim 1, wherein the label distribution control block forwards the information to the SNMP agent as a trap when the label distribution information is modified for network management; When the initial label distribution information is required in the SNMP agent for the network management, when the label distribution control block requests the corresponding information, the label distribution control block delivers the required information; When an operator inputs a command through the command manager for system management, the label is delivered to the label distribution control block to execute the corresponding command and deliver the result to the command manager. Device. The method of claim 1, wherein the label distribution control block has an IP / TCP / UDP interface according to a signaling protocol applied for basic protocol control message communication with a proximity system, and transmits and receives a corresponding message; In case of LDP / CR-LDP protocol, it has a UDP interface for sending and receiving Hello messages for peer discovery, and has a TCP interface for sending and receiving LDP / CR-LDP messages other than Hello messages. In case of RSVP-TE protocol, it has an IP interface to send and receive protocol messages and sends and receives corresponding messages; A memory manager to allocate memory from the label distribution control block to manage memory required for processing; The label distribution control block has a timer manager to wait for periodic timer events therefrom for the necessity of performing periodic processing and time related processing routines, and performs processing routines required for the corresponding timer events. Label distribution controller in MPLS / GMPLS networks.