KR20040046286A - Multi-protocal label switching and the method for dynamic fec mapping setting in this system - Google Patents

Abstract

The present invention relates to a multi-protocol label switch system and a method for setting a dynamic transmission equivalency class mapping for the system, the system comprising: a RIB for processing and storing routing entry information and notifying IBM when changed routing entry information is detected; LSP FEC mapping information storage unit that stores FEC combination information for the LSP set in the label switch network.If the routing entry information of the RIB is changed, the LSP FEC mapping information storage unit searches for the FEC combination information of the LSP in the LSP FEC mapping storage unit and corresponds to the changed routing entry information. FEC combination for the changed LSP transmitted from the MSC consisting of the MSC consisting of IBM to register and send only FEC combination information to the LSP FEC mapping information storage unit and send to FIBM, FIBM to send information transmitted from IBM to the FE Register and update the information by adding it to the FEC combination information for the previously registered LSP. It characterized in that it comprises the FE to perform data processing based on traffic. Therefore, according to the multi-protocol label switch system according to the present invention, when there is a change in the routing entry of L3 in the multi-protocol label switch network, the operator automatically updates the network operation burden caused by the operator mapping the FEC for the changed LSP manually. It can also reduce and optimize the use of network resources and system management.

Description

MULTI-PROTOCAL LABEL SWITCHING AND THE METHOD FOR DYNAMIC FEC MAPPING SETTING IN THIS SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network system. In particular, in the multi-protocol label switching system, in the method of mapping the FEC to the LSP, the traffic loss and the system load occurring when there is a change in the routing entry of the L3 is determined. A multi-protocol label switch system for reducing and a method of setting dynamic transport equivalence class mapping for the system.

Multiprotocol label switch systems simplify connection forwarding by introducing the concept of connection-oriented on connection-less IP networks. That is, a fixed path from a label edge router (LER) of an ATM network to another LER, that is, a label switch path (LSP or less) (LSP), is set at a call setup time. do.

Forwarding Equivalence Class (FEC) information required for LSP setup is stored and data traffic processing is performed through FEC combination information for this set LSP.

A general configuration of a multiprotocol label switch system network is located at the edge of the multiprotocol label switch network, as shown in FIG. 1, and the multiprotocol label switch system 31 or 32 or a non-multiprotocol label switch system 21 is shown in FIG. It is composed of a plurality of LER (11 to 15) in conjunction with.

The LERs 11 to 15 analyze the headers (IP addresses) of packets transmitted from the non-multiprotocol label switch network 21 and the multiprotocol label switch systems 31 and 32 to determine the LSPs to which the packets are delivered. .

In this way, the actual IP packet delivery of the multi-protocol label switch system is performed only through the LSP preset between the plurality of LERs 11 to 15. At this time, a protocol used to set LSP between LERs of a multi-protocol label switch system is a label distribution protocol (hereinafter referred to as LDP).

The LERs 11 to 15 use this LDP to determine the routing entry of L3 held by the LERs 11 to 15, determine the FEC based on the destination address in the IP header of the routing entry, and combine the plurality of FECs. aggregation and mapping by combining the FEC for the LSP, and based on this information, the LER (11 to 15) performs data traffic processing.

Accordingly, unlike the existing Internet network operating in a connectionless manner, a connection-type logical channel is established and traffic is controlled by flowing Internet traffic to the set LSP. The multiprotocol label switch system also has Explicit Routed LSP (ER-LSP) configuration and Flow Categorize to control the allocation and flow of one resource to each traffic. Through this, it is possible to differentiate and provide services for subscribers and control over IP traffic, which could not be performed conventionally.

However, in order to provide a network subscriber with a high quality service using a traffic engineering function in a multi-protocol label switch system, the operator must manually set the subscriber's path, FEC information, and information related to the service.

As such, the multi-protocol label switch system cannot update the FEC combination information for the changed L3 routing entry because there is no algorithm to automatically update the FEC combination information for the LSP even if there is a change in the routing entry of the L3. .

For example, during the initial setup of a multi-protocol label switch system, a routing entry ((1.1.1.1) to (1.1.1.100)) exists in the first LER 11, and only the FEC combination information for the corresponding LSP is initially set. When the routing entry of the L3 is changed later, the FEC combination information for the corresponding LSP could not be automatically updated.

Therefore, when the LER 11 receives data traffic from the routing entry of L3 which has not been updated, the LER 11 recognizes and discards the channel as an unopened channel.

Therefore, for normal data traffic processing, the operator continuously checks the change in the routing entry of L3 and manually updates the FEC combination information for the LSP corresponding to the changed L3 routing entry.

Therefore, data traffic loss may occur until the FEC combination information for the LSP is manually updated again, and when the FEC combination information for the LSP is excessively updated, network resource utilization and system load may also be increased. there was.

Accordingly, an object of the present invention is to provide a multi-protocol label for enabling automatic updating of FEC combination information for an LSP corresponding to information of a changed L3 routing entry when a change occurs in a routing entry of L3 of a multi-protocol label switch system. An object of the present invention is to provide a method for setting dynamic FEC mapping of a switch system and a multi-protocol label switch system.

In order to realize the above object, the multi-protocol label switch system of the present invention searches for only the changed routing entry when the L3 routing entry changes, immediately reflects only the FEC mapping information for the changed routing entry, and updates the FEC for the changed LSP. The FEC mapping information for the changed LSP transmitted by the multi-protocol label switch system main control means, which transmits only the mapping information to the FE, and the FEC mapping information for the changed LSP transmitted by the multi-protocol label switch system main control means, is added and updated. And a forward engine for processing data traffic based on the updated information.

In order to achieve the above object, the dynamic FEC mapping setting method of the multi-protocol label switch system of the present invention searches for the LSP FEC mapping information means in the information management means when a change occurs in the entry of the routing information means. A first step of determining the necessity of updating the combination information; and if it is determined that the necessity of the update is determined by the first step, the FEC combination information for the LSP corresponding to the changed routing entry is assigned to the existing registered LSP of the LSP FEC mapping information means. The second step of registering to the FEC combination information for the additional information and only the FEC combination information for the changed LSP to the forwarding information management means, and transmits only the FEC combination information for the changed LSP transmitted through the forwarding information management means to the forwarding engine Receiving the FEC combination information on the modified LSP from the forwarding engine And a fourth step of registering and updating the FEC combination information for the changed LSP registered in the zone, and performing data processing based on the updated information.

1 is a network diagram of a multi-protocol label switch system.

2 is a block diagram illustrating data processing of a multiprotocol label switching system according to the present invention.

3 is a flowchart of an embodiment illustrating a method for setting dynamic FEC mapping of a multi-protocol label switch system according to the present invention.

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

10: multi-protocol label switch system main control

20: routing information storage unit 30: information processing unit

40: forwarding information processing unit 50: LSP FEC mapping information storage unit

60: forward engine

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

2 is a block diagram illustrating data processing of a multiprotocol label switching system according to the present invention.

Referring to FIG. 2, each of the plurality of LERs constituting the multi-protocol label switching system includes an RIB 20, an LSP FEC mapping information storage unit 30, an IBM 40, and an MSC 10 including an FIBM 50. And the FE 60 can be configured.

The MSC 10 is composed of the RIB 20, the LSP FEC mapping storage unit 30, and the IBM 40 and the FIBM 50. When the routing entry of L3 of the RIB 20 changes, the IBM 30 Searches for only the changed routing entry and immediately reflects only the FEC mapping information for the changed routing entry to update the LSP FEC mapping storage unit 30 and transmits only the FEC mapping information for the changed LSP to the FE 60.

In more detail, the RIB 20 of the MSC 10 processes the routing information for L3. That is, the routing entry information of the L3 to which the IP network belongs is stored by using the LDP between LERs, and when the routing entry information is changed, the IBM 40 is notified.

The LSP FEC mapping information storage unit 30 stores the FEC mapping information for the LSP set in the multi-protocol label switch network.

The IBM 40 performs overall resource management. When the LB routing entry information is notified from the RIB 20, the IBM 40 searches the LSP FEC mapping information storage unit 30 to map the FEC corresponding to the changed L3 routing entry.

This FEC mapping information is further registered to the FEC combination information for the previously registered LSP in the LSP FEC mapping information storage unit 30 to update the LSP FEC mapping information storage unit 30. In addition, only the FEC mapping information for the changed LSP is transmitted to the FIBM (50).

The FIBM 50 receives the FEC mapping information for the changed LSP from the IBM 40 and transmits it to the FE 60.

The FE 60 receives the FEC mapping information for the changed LSP sent by the FIBM 50 and adds the FEC mapping information for the registered LSP to update the FEC combination information for the LSP. Based on this, the channel for data traffic is connected or terminated, and forwarding and merging of data traffic is performed.

Hereinafter, a method of setting dynamic FEC mapping of a multiprotocol label switch system when a routing entry of L3 is changed will be described with reference to the accompanying drawings.

3 is a flowchart illustrating an embodiment of a method for setting dynamic FEC mapping of a multi-protocol label switch system according to the present invention.

The LSP between each LER of a multiprotocol label switch system is set up, and IBM for each LER stores the FEC combination information for the set LSP in the LSP FEC mapping information storage, and sends it to the FE via FIBM for the FE to LSP. Register the FEC mapping information to set up the system initially (step S1).

Based on the information initially set in step S1, the FE configures a data traffic channel and performs data traffic processing (step S2).

It is determined whether the L3 routing entry information stored in the RIB has been changed, and if the routing entry of L3 has been changed, notified to IBM, and if the routing entry of L3 has not been changed, step S2 is performed (step S3).

When notifying that IBM has changed the L3 routing entry information in step S3, the mapping information is searched for the FEC for the LSP set in the LSP FEC mapping storage unit (step S4).

It is determined whether there is an FEC for the L3 routing entry changed in step S4 (step S5).

If it is determined in step S5 that the FEC for the changed L3 routing entry exists, the LSP FEC mapping information storage unit is updated by adding the FEC mapping information for the changed LSP to the FEC mapping information for the LSP previously stored in the LSP FEC mapping storage unit. Only the FEC mapping information for the changed LSP is transmitted to FIBM (step S6).

The FEC mapping information for the changed LSP transmitted in step S6 is transmitted to the FE (step S7).

In the FE, the FEC mapping information for the changed LSP is additionally registered to the FEC mapping information for the previously set LSP to update the FEC mapping information for the LSP. Perform the processing (step S8).

As described above, according to the method of setting the dynamic FEC mapping of the multi-protocol label switching system and the multi-protocol label switching system according to the present invention, when a change is made in the routing entry of the L3 of the LER, it is automatically updated to allow the operator to manually change the LSP. Reducing the operational burden of network operations by mapping FEC

And because the update is performed using only the FEC combination information for the changed LSP, it is possible to optimize the network resource utilization and system management.

Claims (4)

In a multi-protocol label switching system in which a plurality of label edge routers are linked to form a network, Each of the plurality of label edge routers A multi-protocol label switch system main control means for retrieving only the changed routing entry and immediately reflecting and updating only the FEC mapping information for the changed routing entry and transmitting only the FEC mapping information for the changed LSP to the FE when the routing entry of L3 changes; And The FEC mapping information for the changed LSP transmitted from the multi-protocol label switch system main control unit is added to the FEC mapping information for the existing LSP and updated, and a forward engine is provided to process data traffic based on the updated information. Multiprotocol label switch system, characterized in that. The method of claim 1 wherein the multi-protocol label switch system main control means When the routing entry information is changed, the FEC combination information for the LSP corresponding to the changed routing entry is added to the FEC combination information for the previously registered LSP to update the FEC combination information for the LSP, and only the FEC combination information for the changed LSP is updated. Information management means for transmitting to the forwarding information management means; And And forwarding information management means for transmitting only the FEC combination information for the LSP changed by the information management means to a forwarding engine. The method of claim 2 wherein the information management means Routing information storage means for processing the routing entry information to store the routing entry information and notifying the information management means when the changed routing entry information is detected; And And LSP FEC mapping information storage means for storing FEC combination information for LSP registered in the multi-protocol label switch system. A first step of retrieving the LSP FEC mapping information means from the information management means and determining the necessity of updating the FEC combination information for the LSP when a change occurs in the entry of the routing information means; If it is determined that the update is necessary by the first step, the FEC combination information for the LSP corresponding to the changed routing entry is additionally registered to the FEC combination information for the existing registered LSP in the LSP FEC mapping information means and the Transmitting only the FEC combination information to the forwarding information management means; Transmitting only the FEC combination information for the changed LSP transmitted through the forwarding information management means to a forwarding engine; And And a fourth step of receiving, by the forwarding engine, the FEC combination information on the changed LSP, adding and registering the FEC combination information on the changed LSP, and performing data processing based on the updated information. A method for setting dynamic FEC mapping of a multi-protocol label switch system, characterized in that.