KR101034915B1 - Method for managing complex connection between metro ethernet and MPLS in ATM network - Google Patents

Abstract

According to the present invention, an Ethernet-Asynchronous Transfer Mode Switching scheme is used for a Metro Ethernet Exchanger and an ATM Exchange, and an MPLS Switcher generates an interface for an MPLS service, but an ATM is generated at an ATM port and an MPLS Switcher of a Metro Ethernet Switcher or an ATM Switcher. Disclosed is a technique for providing a multi-protocol label switching service to a subscriber of a high speed network in a metro Ethernet environment by managing a composite connection by making a virtual path identifier and a virtual channel identifier of a port the same.

To this end, the present invention provides a first process for creating a link between an ATM switch and an MPLS exchange period; A second step of creating a composite connection for the link; And when a modification command for the composite connection is input by an operator, transmits the modification command to an adapter managing the network equipment on which the composite connection is performed, and modifies the composite connection as requested by the operator on the network equipment. And a third process of managing the modified result in the network management system.

Description

Method for managing complex connection between metro ethernet and MPLS in ATM network in asynchronous transmission mode high speed network

1 is a block diagram of a general asynchronous transmission mode (ATM) high speed communication network.

2 is a block diagram of a typical multi-protocol label switching (MPLS) network.

Figure 3 is a network configuration to which the present invention is applied.

4 is a block diagram of a metro Ethernet-multiprotocol label switching composite connection management system in an asynchronous transmission mode high speed communication network according to an embodiment of the present invention.

5 to 9 are flowcharts for explaining a method for managing a metro Ethernet-multiprotocol label switching complex connection in an asynchronous transmission mode high speed communication network according to an embodiment of the present invention.

The present invention relates to a method for managing a Metro Ethernet-multiprotocol label switching complex connection in an asynchronous transmission mode high-speed network, and more particularly, to a Metro Ethernet switch having an Ethernet port in an asynchronous transmission mode high-speed network and a multi-protocol of an asynchronous transmission mode. The present invention relates to a technology for managing a Metro Ethernet-Multiprotocol Label Switching composite connection to provide a multi-protocol Label Switching service to a Metro Ethernet subscriber in conjunction with a Label Switching Switch.

As shown in FIG. 1, the asynchronous transmission mode ultra high speed communication network is composed of a virtual path (VP) layer network and a virtual channel (VC) layer serving as a client of the virtual path layer network. The virtual path layer network and the virtual channel layer network have a server / client relationship. Each layer network consists of several sub-networks (SNW), and each sub-network consists of several nodes.

In an asynchronous transmission mode (ATM) high speed network management system, a node is a switch, and each switch is connected via a link. In addition, the end-to-end connection in the network for providing a connection service to the subscriber is called a trail (Trail), and the unit connection for each exchange, which is a subordinate concept of the trail, is called a cross connection (XC). Connections can also be divided into virtual path connections (VPC) and virtual channel connections (VCC), depending on the layer network to which the connection belongs.

In a high speed network, a multiprotocol label switching (MPLS) exchange, as shown in FIG. 2, is a terminal for accommodating subscribers to an exchange having a multiprotocol label switching function of asynchronous transmission mode as well as the existing asynchronous transmission mode function. It is divided into a Label Edge Router (LER) serving as an exchanger and a Label Switch Router (LSR) serving as a backbone exchange. Among them, the label-terminated router creates a Logical IP Subnet (LIS) interface on the subscriber port to provide a connection to the subscriber, and labels the packets coming through the interface to provide a corresponding Label Switching Path (LSP). Label Switching Path). A label exchange router is a switch that switches labels using a Label Distribution Protocol (LDP).

Metro Ethernet switch in ATM high-speed network provides Ethernet port to subscriber side and ATM port to network side, interworking with ATM switch and MPLS switch. Metro Ethernet exchanges switch internally using Virtual LAN (VLAN). The virtual LAN function is a function of grouping some of ports in one exchange and configuring them as one LAN. In this case, the ports connected together transmit and receive data in a broadcast format. The Metro Ethernet switch enables the switching of virtual channel connections within Ethernet ports and ATM ports into a single virtual LAN. You can also configure multiple Ethernet ports and one virtual channel connection as a virtual LAN.

On the other hand, due to the advantages of the MPLS service, it is required to provide the MPLS service to subscribers of the high-speed communication network in the Ethernet environment, but for this purpose, link management function for interworking between the Metro Ethernet switch or ATM switch and the MPLS exchange period, and complex connection creation / Although management functions such as change / deletion are required, the conventional ATM ultra-high speed network management system does not provide such a function, and thus does not solve the above requirement.

Accordingly, in accordance with the above-described demands, the present invention uses the Ethernet-asynchronous transfer mode switching scheme for the Metro Ethernet switch and the ATM switch, and generates an interface for the MPLS service in the MPLS switch, but the ATM port of the Metro Ethernet switch or the ATM switch. The purpose of the present invention is to provide a multi-protocol label switching service to subscribers of a high-speed communication network in a metro Ethernet environment by managing a complex connection by making the virtual path identifier and the virtual channel identifier of the ATM port at which the interface is created in the MPLS exchange and the MPLS exchange.

A method of the present invention for achieving the above object is a method for managing a Metro Ethernet-multiprotocol label switching complex connection in an asynchronous transmission mode ultra high speed communication network, wherein a network management system creates a link between an ATM switch and an MPLS exchange. Generating step; Generating a complex connection by the network management system to create a complex connection to the link; And when a modification command for the composite connection is input by an operator, transmits the modification command to an adapter managing the network equipment on which the composite connection is performed, and modifies the composite connection as requested by the operator on the network equipment. Managing the modified result in the network management system.

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

3 is a diagram illustrating a network configuration to which a method for managing a metro Ethernet-multiprotocol label switching complex connection is applied in an asynchronous transmission mode ultra high speed communication network according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the Metro Ethernet switch 30 is connected to a label-end router (LER) of the MPLS network through an asynchronous transfer mode switch (hereinafter referred to as "ATM switch").

Metro Ethernet switch 30 is composed of a plurality of virtual LAN (37, 38) consisting of a plurality of ports to the subscriber side, the logical end of the LER 34, IP interface 36 is configured, the LER (34) Label a packet coming into the logical IP subnet 36 interface so that the packet is sent to the LSP.

At this time, the trail 40 is configured between the subscriber end of the Metro Ethernet switch 30 and the subscriber end of the LER 34, the Metro Ethernet switch 30 and the ATM switch 32, or the ATM switch 32 and the LER 34 ) Is connected by a link 31.

Metro Ethernet-multi-protocol label switching complex connection management apparatus in the asynchronous transmission mode ultra-high speed communication network according to an embodiment of the present invention, in conjunction with the operator GUI 40, as shown in Figure 4, ATM 72, LER 74 ), The LSR 76, and the M / E 78, the network management system 50 for managing the adapter 70 for each region.

Network management system 50, the upper system linkage module 51, subscription work module 52, equipment module 53, connection module 54, routing module 55, performance / failure module 56, current The module 57, the facility information storage unit 58, the connection information storage unit 59, and the failure information storage unit 60 is provided.

The upper system interworking module 51 interworks with a higher system on a different platform from the network management system, namely, a subscription generation system, a failure management system, a facility management system, and the like to transmit a command from the corresponding system to the network management system. The subscription work module 52 receives the information about the port and connection to be used by the customer through the upper system interworking module, and then sends the result to the facility module or the connection module according to the operator's input and informs the upper system of the result. The equipment module 53 performs the function of creating / modifying / deleting equipment information, that is, a node, a port and a physical link, and the connection module 54 creates / modifies / deletes a trail which is an end-to-end connection. Perform the function. In addition, the routing module 55 performs a task of finding a section in which a trail is to be generated according to the operator's condition on the trail to be generated, and the performance / failure module 56 verifies and tests a failure state of a port or a trail. The current module 57 reads the equipment and the connection information in the equipment and reflects them to the network management system.

In addition, the network management system 50 is configured to manage node Ethernet, multi-protocol label switching complex connection in asynchronous transmission mode high speed communication network, node information, port information, physical link information, and the like. Facility information storage unit 58 for storing the facility information, the connection information storage unit 59 for storing the trail information indicating the end-to-end connection and cross-connection information, such as individual connection information in the node, and the board failure occurrence state from the device And a failure information storage unit 60 for storing a cause, a port failure state, and a connection failure information related to the cause and the failure occurring in the device.

Hereinafter, with reference to the block diagram shown in FIG. 4 and the flowcharts shown in FIGS. 5 to 9, a method for managing a multi-ethernet-multiprotocol label switching complex connection in an asynchronous transmission mode high speed communication network according to an embodiment of the present invention. It will be described in detail.

Before configuring a composite link, the operator must create a link on which the ATM link to form the composite link and the composite link of the MPLS exchange period can be established.

5 is a flowchart for explaining the above-described link generation procedure.

As the link generation is requested through the operator GUI 40 (501), information for link generation, for example, the range and bandwidth of the virtual path identifier for configuring the MPLS circuit in the link, asynchronous transmission mode permanent virtual circuit (PVC) When the range and bandwidth of the virtual path identifier for configuration, and the local / international port information are input, the facility module of the network management system 50 receiving the request checks whether the local port is the MPLS port (502).

As a result of the determination in step 502, if it is determined that the own station port is the MPLS exchange port (YES at 502), the equipment module sets the virtual path identifier range for the MPLS line on the counter port side in the asynchronous transmission mode because the power port is the port of the ATM switch. It is included in the permanent virtual circuit virtual path identifier range (503) and the bandwidth for MPLS of the power port is also included in the bandwidth for the asynchronous transmission mode permanent virtual circuit (PVC) (504).

However, if the determination in step 502 determines that the own station port is not the MPLS exchange port (NO at 502), the equipment module sets the MPLS virtual path identifier range of the own port side to ATM ATM because the power port is the port of the MPLS exchange. It is included in the VPI (505), and the bandwidth for MPLS of the local port is also included in the ATM PVC bandwidth. (506)                     

Based on the self / country port information adjusted in the above-described manner, the facility module sends a port configuration command to the adapter 70 for each port (507), and the corresponding port in each device configured in the adapter 70 As configured, when the port configuration result transmitted from each device is transmitted to the facility module 53 of the network management system 50 through the adapter 70, the facility module 53 of the network management system 50 in the port Link information corresponding to the configuration result is stored in the facility information storage unit 58 (508).

FIG. 6 is a flowchart for configuring a composite connection after configuring a trail terminated at an ATM switch port of a link configured through the procedure of FIG. 5.

When a trail generation is requested from the operator GUI 40 (601), the routing module 55 of the network management system 50 uses the network topology information stored in the facility information storage unit 58 to route the route through the corresponding trail. Search for (602).

As a result of the search, if the trail is present in the Metro Ethernet switch section (YES in step 603), the routing module 55 transmits a Metro Ethernet cross link creation command to the adapter 70 through the connection module 54 ( 605). The adapter 70 receiving the command transmits a cross-connection creation command to the metro exchange 78, and the metro exchange 78 receiving the connection creation command generates a cross-connection, and then manages the generation result. Transfer to the connection module 54 of the system 50.

On the other hand, if it is determined in step 603 that there is no metro Ethernet switch section in the trail (NO in step 603), the routing module 55 connects the adapter 70 to the ATM switch section through the connection module 54. The command to create a cross-connection for the request is sent (605). The adapter 70 receiving the command transmits a cross link creation command to the ATM switch 72, and the ATM switch 72 receiving the link generation command creates a cross link and then manages the result of the network connection. Transfer to the connection module 54 of the system.

After receiving the cross connection information from the adapter 70, in the connection module of the network management system 50 The facility information storage unit 58 is queried to search for the MPLS end exchange, i.e., LER, closest to the trail (607), and then determine whether a port exists in the LER (608).

As a result of the determination in step 608, if a port exists in the LER (YES in step 608), it is determined whether a logical IP subnet (LIS) exists in the port with the same VPI and VCI as the connection (609). As a result, if it is confirmed that the LIS exists in the port with the same VPI and VCI as the corresponding connection (YES in step 609), the LIS adjacent to the connection is configured as one composite trail and stored in the connection information storage unit 59. 610.

However, unlike in the case described above, if there is no port in the LER in step 608 (“No” in step 608), or if there is no LIS with the same VPI and VCI for that port in step 609 (step 609). In step 611, the cross connection information received from the adapter 70 is configured as trail information and stored in the connection information storage unit 59 (operation 611).

Next, with reference to FIG. 7, if there is a trail terminating at a port of an ATM switch connected to the MPLS switch and connected to the corresponding trail, a procedure of creating a complex connection after creating a logical IP subnet will be described.

In the facility module 53 of the network management system 50, when a logical IP subnet generation request is made from the operator (701), the logical IP subnet generation request is transmitted to the adapter 70 (702). By the request, the adapter 70 generates a logical IP subnet and transmits the generated logical IP subnet information to the facility module of the network management system 50.

In the facility module 53 of the network management system 50, the connection information storage unit 59 is used to search for an ATM switch adjacent to the logical IP subnet (704). It is checked whether the port exists (705).

As a result of the check, if there is an ATM port adjacent to the logical IP subnet (YES at 705), in the installation module 53, the connection information storage unit 59 has the same virtual path identifier as the logical IP subnet at the corresponding port; It is checked whether there is a trail terminated with the virtual channel identifier (706).

As a result of checking in step 706, if there is a trail terminating in the corresponding port with the same virtual path identifier and virtual channel identifier (YES at 706), the logical IP subnet and the trail are combined into one composite trail. After configuration (707), the trail configuration information is stored in the connection information storage unit (59).

However, if there is no ATM port adjacent to the logical IP subnet in step 705 (“No” in step 705), or if there is no virtual path identifier and virtual channel identifier that is the same as the logical IP subnet adjacent to the port in step 706 (706). (No)), only logical IP subnet information is configured, and the logical IP subnet information is stored in the connection information storage unit 59 (708).

Next, a procedure of changing the bandwidth of the complex connection generated in FIG. 6 or 7 will be described in detail with reference to the flowchart shown in FIG. 8.

When the connection module 54 of the network management system 50 receives a complex connection change request from the operator GUI 40 (801), the connection information storage unit 59 crosses a lower level with the logical IP subnet which is the sub information of the complex connection. The connection is extracted, and a change request for the extracted logical IP subnet and a change request for the cross connection are sent to the adapter 70 (802 and 803). In response to the change request, the adapter 70 makes a change to the logical IP subnet and a change to the cross connection, and then connects the logical IP subnet information and the cross connection information corresponding to the connection module of the network management system 50. To send.

The connection module 54 of the network management system 50 stores the logical IP subnet information and the cross connection information in the connection information storage unit 59 to reflect them in the network management (805).

In addition, referring to the flowchart shown in FIG. 9, the procedure of deleting the complex connection created in FIG. 6 or 7 will be described in detail.

When the connection module 54 of the network management system 50 receives a request for deleting a complex connection from the operator GUI 40 (901), the connection information storage unit 59 cross-links the logical IP subnet which is the sub-information of the complex connection with a lower cross connection. And extracts the deletion request for the extracted logical IP subnet and the deletion request of the cross connection to the adapter 70 (902, 903). By the deletion request, the adapter 70 deletes the logical IP subnet and deletes the cross link, and then transmits the deletion result to the connection module of the network management system 50.

In the connection module 54 of the network management system 50, the deleted logical IP subnet information and cross connection information are deleted from the connection information storage unit 59 and reflected in the network management (905).

According to the present invention as described above, by providing and managing a complex connection in the ATM high-speed communication network, by providing the ATM transport mode MPLS service to the Metro Ethernet subscriber, users can take advantage of higher quality Internet access and virtual private network function In addition, the network operator can expect the effect of increasing profits by creating new services.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (9)

A link generation step of the network management system generating a link between the ATM switch and the MPLS exchange period; Generating a complex connection by the network management system to create a complex connection to the link; And When a modification command for the composite connection is input by the operator, the modification command is transmitted to an adapter managing the network equipment on which the composite connection is performed, thereby modifying the composite connection as requested by the operator on the network equipment. Managing the modified result in the network management system Metro Ethernet-Multiprotocol Label Switching composite connection management method in an asynchronous transmission mode high-speed network comprising a. The method of claim 1, The link generation step, Confirming whether a local port of the link is an MPLS exchange port when a link generation is requested from the operator; As a result of the check, if the local port of the link is a port of an MPLS switch, the virtual path identifier range for the MPLS line on the counter port side is added to the ATM transmission mode permanent virtual circuit virtual path identifier range, and the bandwidth for MPLS of the counter port is added. A port port processing step of adding up the bandwidth for the ATM transmission mode permanent virtual circuit; Transmitting a port configuration command based on a result of the power port processing step to the adapter, and generating link information based on a port configuration result transmitted from the adapter; As a result of the check, if the local port of the link is not a port of the MPLS exchange, the virtual path identifier range for the MPLS line at the local port side is added to the ATM transmission mode permanent virtual circuit virtual path identifier range, and the MPLS for the local port is A local port processing step of adding the bandwidth to the bandwidth for the ATM transmission mode permanent virtual circuit; And Transmitting a port configuration command based on the result of the local port processing step to the adapter, and generating link information based on the port configuration result transmitted from the adapter; Metro Ethernet-Multiprotocol Label Switching composite connection management method in an asynchronous transmission mode high-speed network comprising a. The method of claim 2, The checking step, The network management system receives the range and bandwidth of the virtual path identifier for the MPLS circuit configuration and the range of the virtual path identifier for the permanent virtual circuit configuration of the non-synchronous transmission mode and the local / national port information on the link requested from the operator. step Metro Ethernet-Multiprotocol Label Switching composite connection management method in an asynchronous transmission mode high-speed network comprising a. The method of claim 1, The composite connection generation step, Configuring an end trail at an ATM switch port (power port) of the link created in the link creation step; And First generation step of generating a composite connection for the generated link Metro Ethernet-Multiprotocol Label Switching composite connection management method in an asynchronous transmission mode high-speed network comprising a. The method of claim 4, wherein The first generation step, Checking whether the trail passes through a metro Ethernet switch section; As a result of the checking, if the connection is over a Metro Ethernet switch section, instructing a cross-connection creation to the Metro Ethernet switch in the section through the adapter; Instructing a cross-connection creation to an ATM switch via the adapter, if not via a Metro Ethernet switch section; Determining whether a logical IP subnet identical to the trail exists in a port of an MPLS end switch adjacent to the trail; If it is determined, storing the trail and the logical IP subnet as a composite trail if present; And If it does not exist, configuring and storing the cross connection result received from the adapter as trail information; Metro Ethernet-Multiprotocol Label Switching composite connection management method in an asynchronous transmission mode high-speed network comprising a. The method of claim 1, The composite connection generation step, A logical IP service net generation step of generating a logical IP service net connected to the trail if an end trail exists in the ATM switch port (power port) of the link generated in the link generation step; And A second generation step of generating a composite connection for the generated link; Metro Ethernet-Multiprotocol Label Switching composite connection management method in an asynchronous transmission mode high-speed network comprising a. The method of claim 6, The logical IP service net creation step, When the logical IP subnet generation is requested from the operator, Metro Ethernet-multiprotocol label switching complex connection in the asynchronous transmission mode high-speed communication network, characterized in that the logical IP subnet is generated by the adapter to create a logical IP subnet to the associated equipment. How to manage. 8. The method according to claim 6 or 7, The second generation step, Querying an ATM switch adjacent to the logical IP subnet; Determining whether a trail terminated with a virtual path identifier and a virtual channel identifier identical to the logical IP subnet exists in a port of the ATM switch; And If it is determined that the trail exists, the trail is configured as a composite trail and managed by the network management system. If the trail does not exist, only logical IP subnet information is managed by the network management system. Metro Ethernet-Multiprotocol Label Switching composite connection management method in an asynchronous transmission mode high-speed network comprising a. The method of claim 1, The modify command is And a bandwidth change command and a delete command for the composite connection.

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