KR19990048608A - Method and apparatus for internet protocol data transmission in internet protocol over asynchronous transmission mode approach - Google Patents

Abstract

The present invention relates to a method for transmitting IP data from a terminal to local / remote forwarding in an internet protocol over asynchronous transmission mode approach, comprising: determining whether received IP data is registered in a predetermined forwarding table; If not registered in the forwarding table, selecting a local / remote forwarding method according to the service type of the IP data; If a local forwarding scheme is selected, interpreting an ATM address of the received IP data and performing local forwarding to the corresponding ATM address; Analyzing the router address to which the IP data is to be transmitted if the remote forwarding method is selected, and performing remote forwarding to the corresponding router address; After local / remote forwarding, storing information about the address, service type, transmission method, and transmission address of the forwarded IP data in the forwarding table; If the received IP data is registered in the forwarding table, forwarding is performed according to the information in the forwarding table.

Accordingly, the present invention has an effect that the resources of the network can be efficiently used in the IP over (ATM) ATM approach.

Description

Method and apparatus for internet protocol data transmission in internet protocol over asynchronous transmission mode approach

The present invention relates to an Asynchronous Transfer Mode (ATM) network, and more particularly, to an IP over ATM access method and apparatus for enabling transmission of Internet Protocol (IP) data. .

Cell-based ATM technology has many advantages over traditional network technology. In addition to providing a single interface for a variety of services (audio, video, and data) over a wide geographic range from LAN to WAN, future multimedia services such as connection control, efficient use of resources, and quality assurance of services are realized. To provide useful techniques.

However, even though ATM technology has such attractive technical characteristics, existing investment and installed networks cannot be replaced with ATM networks at once. For example, although the Internet-based TCP / IP (Internet Missing Control Protocol / Internett Protocol) Internet application network, which has a large number of users worldwide, is widely used, it cannot be replaced by ATM network at once. Control Protocol / Intenet Protocol) Methods for accommodating Internet application networks in ATM networks have been proposed.

One of these methods is the IP over ATM approach, which introduces Logical IP Subnetwork (LIS), a logical concept that corresponds to IP subnetwork, and one ATM routing server and ATMARP server in one LIS. Is present to map IP addresses to ATM addresses and to route IP packets between multiple LISs. That is, when an IP packet is transmitted from a predetermined terminal, address mapping information is obtained by an ATMARP server, and a connection is established using the link level address of the destination node thus obtained, that is, an ATM address. Here, in the case of a node existing in the same LIS, direct connection through an ATM switch is possible. Otherwise, that is, in the case of a node existing in another LIS, an IP packet is transmitted through an ATM routing server.

Therefore, in this method, ATM connections can be made between ATM switches through ATM switches, but IP connections existing in different LISs cannot be connected to ATMs.

In order to solve this problem, the ROLC group of IEFT established NHRP scheme to enable ATM connection even if the host belongs to another LIS group.

The NHRP method is used to provide direct connections between hosts on a network. The NHS (Next Hop Server) provides address resolution and routing in each LIS, and many ATM addresses correspond to IP addresses of hosts in other LISs. It is a way that can be interpreted by cooperation between NHSs.

Using this NHRP scheme, ATM direct connection between hosts belonging to different LIS is possible, but the following problems have been found.

That is, in the conventional method, only the address information such as an IP source address, a destination address, and a subnet address mask of the LIS is used, and local (i.e., through ATM) is forwarded when IP data is forwarded. This means that you will be able to decide whether to connect to an IP router or remote. Therefore, when local forwarding is determined, the ATM Switched Virtual Circuit (SVC) is provided for the input IP data, which wastes resources of the SVC management overhead (connection establishment, maintenance, release, etc.) network. Occurs. For example, connecting and releasing one SVC for ping, which is a relatively small amount of data, is a deterrent to the efficient use of network resources. In this case, employing a conventional router scheme will be an efficient use of network resources.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for transmitting Internet protocol data in an ATM network employing local or remote forwarding in consideration of the characteristics of IP data and the required quality of service. .

Another object of the present invention is to provide an apparatus for transmitting Internet protocol data in an ATM network employing local or remote forwarding in consideration of characteristics of IP data and required quality of service.

1 is a block diagram of an internet protocol data transmission apparatus in an internet protocol over asynchronous transmission mode approach according to the present invention;

2 is a flowchart of an internet protocol data transmission method in an internet protocol over asynchronous transmission mode approach according to the present invention.

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

110, 210: Host 112, 113, 212, 213: ATM Switch

114, 214: ATM signaling receiver

115, 215: NHRP receiver 116, 216: ARP server

117, 217: ATM routing server

In order to achieve the above object, the present invention provides a method for transmitting IP data from a terminal to local / remote forwarding in an internet protocol over asynchronous transmission mode approach, and determining whether the received IP data is registered in a predetermined forwarding table. Wow; If not registered in the forwarding table, selecting a local / remote forwarding method according to the service type of the IP data; If a local forwarding scheme is selected, interpreting an ATM address of the received IP data and performing remote forwarding to the corresponding ATM address; If the remote forwarding method is selected, performing local forwarding to the corresponding router address which has analyzed the router address of which IP data is to be transmitted; After local / remote forwarding, storing information about the address, service type, transmission method, and transmission address of the forwarded IP data in the forwarding table; If the received IP data is registered in the forwarding table, forwarding is performed according to the information in the forwarding table.

The present invention also provides a device configured in a host in a Logical IP Subnetwork (LIS) for transmitting IP data from an ATM terminal to a local / remote forwarding in an internet protocol over asynchronous transmission mode approach. An ATM switch; An ATM switch for connecting to a host in different LISs; An ATM signaling receiver for receiving ATM signaling from a terminal; An NHRP server that enables local forwarding using an ATM switch by providing an ATM address of a destination in another LIS corresponding to a destination address of IP data authorized from the ATM terminal; An ARP server that enables local forwarding using an ATM switch by providing an ATM address of a destination in the same LIS corresponding to a destination address of IP data authorized from an ATM terminal, and provides an Internet protocol address of a destination in another LIS; An ATM routing server that enables remote forwarding according to the Internet protocol address of the ARP server enables the remote forwarding and local forwarding to be selected according to the service type of IP data.

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

Figure 1 shows the connection state of two LIS (100), 200 of the IP over ATM network for implementing the present invention.

Hosts 110 and 210 are configured in each network 100 and 200 as shown, and hosts 110 and 210 are connected to ATM terminals 111 and 211 as shown. ATM switches 113 and 212 are configured for connection with ATM switches 112 and 212 and hosts 210 and 110 in other LIS 200 and 100, respectively.

In addition, the host 110, 210 is provided with an ATM signaling receiver 114, 214 for receiving ATM signaling from the terminal 111, 211, ATM terminal 111, (211) NHRP servers 115 and 215 are provided to provide ATM addresses of destinations in other LISs corresponding to destination addresses of IP data authorized from the host, so that the host 110 and 210 are NHRP servers 115 and 215. Local forwarding for transmitting IP data received from the terminals 111 and 211 to another LIS via the ATM switches 113 and 213 is possible according to the information.

In addition, ARP servers 116 and 216 and ATM routing servers 117 and 217 are configured in hosts 110 and 210, and ATM routing servers 117 and 217 provide connectivity between all hosts in the network. 210 enables local or remote forwarding using link level addresses (ATM addresses) obtained from ARP servers 116 and 216.

That is, when the destination of the IP data is in the same LIS, the host 110 or 210 performs local forwarding by using the ATM switches 113 and 213. When the IP data is not in the same LIS, the host 110 and 210 connects to the corresponding destination through the ATM routing server 117 and 217. IP data can be transmitted.

2 is a flow chart for the host (110, 210) to determine the local or remote forwarding in the network having the configuration described above.

First, IP data from the terminals 111 and 211 have different characteristics, that is, a service type (TOS). That is, some of the IP data require a high quality transmission quality, a high speed transmission speed, etc., while there are some data that are not overwhelming even in a relatively low query transmission quality and a low transmission speed. In this case, local forwarding through ATM switch is preferable for IP data requiring high transmission quality and high transmission speed, while relatively low query transmission quality and low transmission speed are required for the efficiency of network resources. Missing data would be desirable for remote forwarding over an IP network, ie ATM routing server.

Table 1 shows the preferred transmission scheme (ie local or remote forwarding) for the efficiency of network resources according to the service type of IP data.

Delay Bit Throughput Bit Reliability Bit Forwarding method normal normal normal local normal normal Go local normal Go normal Remote normal Go Go Remote that normal normal local that normal Go local that Go normal Remote that Go Go Remote

In the present invention, the IP data transmission method is set corresponding to Table 1 above.

That is, when the IP data is received from the terminals 111 and 211 (S1), the host 110 or 210 determines whether the IP data is registered in the forwarding table (not shown) (S2). Based on the type, a transmission method, that is, a remote forwarding or a local forwarding method is selected (S3).

As a result of the determination in step S3, if the local forwarding method, the host (110, 210) interprets the ATM address using the NHRP server (115, 215), and then connects the SVC of the ATM switch 113,213 to the address (S4), the connected SVC It is to transmit the IP data through (S5).

However, if it is determined in step S3 that the remote forwarding method is used, the host (110, 210) interprets the router address of the host to be transmitted using the ARP server (116, 216) (S6) and then the router using the ATM routing server (117,217). IP data is transmitted (S7).

In addition, the host 110 or 210 stores the information on the address and service type of the transmitted IP data, the transmission method, the transmission address, and the like in the forwarding table (S8).

On the other hand, if the received IP data is registered in the forwarding table (not shown) as a result of the determination in step S2, forwarding is performed according to the information (transmission method and information on the transmission address, etc.) in the forwarding table (S9). .

As can be seen from the above description, the IP over ATM method according to the present invention is configured to selectively perform a local or remote forwarding method according to the characteristics of the service type of the received IP data, so that the resources of the network can be efficiently used. It can be seen that.

Accordingly, the present invention has an effect that the resources of the network can be efficiently used in the IP over (ATM) ATM approach.

Claims (2)

A method for transmitting IP data from a terminal to local / remote forwarding in an internet protocol over asynchronous transmission mode approach. Determining whether the received IP data is registered in a predetermined forwarding table; If not registered in the forwarding table, selecting a local / remote forwarding method according to a service type of IP data; If the local forwarding scheme is selected, interpreting an ATM address of the received IP data and performing local forwarding to the corresponding ATM address; If the remote forwarding method is selected, performing remote forwarding to a corresponding router address from which a router address for transmitting IP data is interpreted; After the local / remote forwarding, storing information on an address, a service type, a transmission method, and a transmission address of the forwarded IP data in the forwarding table; And if the received IP data is registered in the forwarding table, forwarding according to the information in the forwarding table. An apparatus configured in a host (110, 210) in a Logical IP Subnetwork (LIS) (100, 200) for transmitting IP data from ATM terminals (111,211) to local / remote forwarding in an internet protocol over asynchronous transmission mode approach. ATM switches 112 and 212 for connection with ATM terminals 111 and 211; ATM switches 113 and 213 for connection with hosts 210 and 110 in different LIS 200 and 100; ATM signaling receivers (114, 214) for receiving ATM signaling from the terminals (111, 211); NHRP server that enables local forwarding using the ATM switches 113 and 213 by providing an ATM address of a destination in another LIS corresponding to a destination address of IP data applied from the ATM terminals 111 and 211. 115, 215; Local forwarding is enabled using the ATM switches 113 and 213 by providing an ATM address of a destination in the same LIS corresponding to a destination address of IP data applied from the ATM terminals 111 and 211. ARP servers 116 and 216 for providing Internet protocol addresses of destinations in the LIS; An ATM routing server 117 that enables remote forwarding according to the Internet protocol addresses of the ARP servers 116 and 216, so that the remote forwarding and local forwarding can be selected according to the service type of the IP data. Internet Protocol data transmission device in a protocol over asynchronous transmission mode approach.