KR100233256B1 - Atm ip routing server apparatus - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an asynchronous transmission mode Internet protocol routing server device.

2. The technical problem to be solved by the invention

The present invention is an asynchronous transmission mode Internet protocol that can support the establishment of a single ATM virtual channel connection between a source and a destination by solving the ATM address for the IP address of the destination requested from any host regardless of the address group to which the destination host belongs. (IP) To provide a routing server device.

3. Summary of Solution to Invention

The present invention, unlike the router routing method of the existing Internet network in the ATM network, by using the routing server to establish the ATM virtual channel connection directly to the destination without intermediate intervention of the router by providing an effective connectionless service support capability in the ATM network Support.

4. Important uses of the invention

The present invention is used in the Internet service network.

Description

Asynchronous transfer mode internet protocol routing server device

The present invention provides an internet protocol (IP) routing function required for Internet service in an asynchronous transmission mode (ATM) network without the help of a router, thereby establishing a plurality of hops between a destination and a destination according to the router's intervention. The present invention relates to a routing server device which avoids the inefficiency of providing a connectionless data service in an ATM network by avoiding the problem and enables a direct connection by a single hop. The present invention provides a routing for providing an efficient routing method in an ATM network. It relates to a server device.

Conventionally, only address resolution servers are mainly developed to provide a connection between each other within the same address group, and routers must be intervened between different address groups. For example, in the ATM network, the destination ATM address must be identified just as a host on the same Ethernet segment can send data to the destination after identifying the hardware address of the desired destination host by the address resolution protocol. You can establish an ATM virtual channel connection for data transfer between the destination and the destination. However, since one of ATM's main features is not a broadcast bus like Ethernet, but a switched star, it is necessary to install an address resolution server in the network for ATM address resolution. You need to query the server to identify the destination address. However, ATM address resolution servers developed to date only support address resolution methods within the same address group, and none have been developed as independent server devices.

Therefore, even if such an address resolution server is used, the router's involvement is required for communication between different address groups.

The burden of other services still remains.

1A is a schematic diagram illustrating a concept of ATM connection using a conventional router.

As the routing method by IP router is applied in ATM network, it can reduce performance compared to the existing Internet network due to the burden of setting up ATM virtual channel connection to destination and inefficient use of resources.

Accordingly, the present invention provides an ATM client function for accessing a host on an existing Ethernet to support smooth interworking between Ethernet and ATM and a router access on the Internet, and to provide an arbitrary host regardless of the address group to which the destination host belongs. It is an object of the present invention to provide an asynchronous transmission mode Internet Protocol (IP) routing server device that can support the establishment of a single ATM virtual channel connection between a sender and a destination by resolving an ATM address for a destination IP address.

1A is a schematic diagram illustrating an ATM connection concept using a conventional router.

1B is a schematic diagram illustrating an ATM connection concept using a routing server according to the present invention.

2 is a temporary functional block diagram of a routing server according to the present invention;

3 is a temporary configuration diagram of the packet transceiver of FIG.

4 is a temporary configuration diagram of an address resolution server function unit of FIG.

Fig. 5 is a schematic structural diagram of a client function unit of Fig. 2;

* Explanation of symbols for main parts of the drawings

101: packet transmission and reception unit 102: address resolution server function unit

103: client function unit 104: signal processing unit

105: shape management unit

In order to achieve the above object, the present invention provides a routing device for an Internet service in an asynchronous transmission mode network, which receives a frame through a first access port and requests address resolution, and receives cells through a second access port. Packet transmitting and receiving means for requesting address resolution by reading the packet type field after merging in units; First address resolution means for processing an address resolution request packet and an address resolution request message received from said packet transmission / reception means or storage means and delivering an address resolution response packet and an address resolution response message as an address resolution result; The storage means for checking a transmission / reception address of a packet received from the packet transmission / reception means and storing it in an allocated place, requesting address resolution to the first address resolution means for an unresolved address pair, and receiving and storing a response; ; Signal processing means for performing a signaling function on a virtual connection establishment request received from the first address resolution means or the storage means and delivering a result; And configuration management means for transmitting and receiving a management message generated in a relationship with the network manager and notifying the network manager of the overall status of each component.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

Figure 1b is a schematic diagram illustrating the ATM connection concept using a routing server according to the present invention, unlike the routing method of the existing Internet network using a router in the ATM network, using the routing server directly to the destination without intermediate intervention of the router using the routing server By establishing a virtual channel connection, an effective connectionless service support capability can be supported in an ATM network, and the cost of using a router can be reduced.

2 is a temporary function block diagram of a routing server according to the present invention, which includes a packet transceiver 101, an address resolution server function 102, a client function 103, a signal processor 104, and a shape manager. 105.

The packet transmitting / receiving unit 101 is a routing device for Internet service in an asynchronous transmission mode network. The packet transmitting / receiving unit 101 generates an Ethernet frame by obtaining an address of a called party and a sending party, and then transmits the packet to the outside or divides the packet into units of ATM cells. It receives a frame destined for the address of the Ethernet access port, requests an address, or merges the cells received from the asynchronous transmission mode access port in packet units, and then requests an address resolution by reading a packet type field.

The address resolution server function unit 102 processes an address request packet and an address resolution request message received from the packet transceiver unit 101 or the client function unit 103 to generate an address resolution response packet and an address resolution response message as a result of address resolution. To pass.

The client function unit 103 checks the transmission / reception address of the Internet protocol packet received from the packet transmission / reception unit 101 and stores it in the assigned place, and resolves the address to the address resolution server function unit 102 for an unresolved address pair. Request and receive and store the response.

The signal processing unit 104 performs a signaling function on the virtual connection establishment request received from the address resolution server function unit 102 or the client function unit 103 and transmits the result.

The configuration management unit 105 transmits and receives a management message generated in a relationship with the network manager and notifies the network manager of the overall state of each component.

3 is a temporary configuration diagram of the packet transceiver of FIG. 2. First, the packet transceiver 101 includes an Ethernet frame processor 201, an ATM cell processor 202, and a packet memory 203.

First, the Ethernet frame processing unit 201 provides an Ethernet connection port according to the 10BASE-T method, connects to an Ethernet segment to transmit and receive Ethernet frames according to IEEE 802.3, and in the case of transmission, an address resolution server function unit. When receiving and receiving Ethernet addresses from 102 and generating an Ethernet frame, in case of reception, when a frame or a broadcast frame destined for the Ethernet address of the Ethernet connection port is received, If it is ARP, the Ethernet type field of the Ethernet frame header is read and transmitted to the address resolution server function unit 102, and if the IP address is transmitted to the client function unit 103.

The ATM cell processing unit 202 provides an ATM connection port by an ATM forum / physical layer of an ATM forum that transmits and receives at up to 155 Mbps, connects an ATM line such as an optical fiber or twisted-pair to an AAL5. As a function that is responsible for packet transmission and reception by a packet, three types of packets such as an IP packet, a signal packet, and a management message are transmitted and received. Among these, IP packets are encapsulated in the case of transmission according to LLC / SNAP of Internet Engineering Task Force (IETF) Request For Comment (RFC) 1483, and then segmented by cell. In case of reception, the received cells are reassembled in packet units, and the packet type field of the packet encapsulated by LLC / SNAP is read. 102, and if the IP address, transmits to the client function unit 103.

One or more Ethernet access ports may be provided, each of which is assigned an IP address, Ethernet address, and ATM address. On the other hand, only one ATM access port is provided, an ATM address is assigned and the IP address is shared with the IP address assigned to the Ethernet access port.

The packet memory 203 is a memory in which a packet received through an Ethernet access port or an ATM access port is actually stored. The Ethernet frame processing unit 201 or the ATM cell processing unit 202 performs an address resolution server function unit 102 or a client function. When the packet is delivered to the unit 103, the address of the packet memory in which the packet is stored is transmitted.

4 is a temporary configuration diagram of the address resolution server function unit of FIG. 2, wherein the address resolution server function unit 102 includes a lower address resolution message queue 204, an upper address resolution message queue 205, and an address resolution unit ( 206, Ethernet address cache 207, ATM address cache 208, server address cache 209, and server connection management unit 210.

The lower address resolution message queue 204 is a buffer that stores the address of the packet memory in which the ARP packet transmitted from the packet transmission / reception unit 101 and the received access port identifier are stored in the first in first out (FIFO) method. The message queue 205 is a buffer that stores the address resolution request command from the client function unit 103 in a FIFO manner. The two queues are accessed by the address resolver 206 in a round-robin manner.

The address resolver 206 processes the ARP packet located at the packet memory address stored in the lower address resolution message queue 204. If the packet is an ARP packet by RFC826 received through the Ethernet access port, the IP address and Ethernet address of the sender are stored in the Ethernet address cache 207. In the case of the ARP_REQUEST packet, the ATM address cache 208 is searched for the destination IP address, and if found, the ARP_REPLY packet is transmitted to the receiving port of the packet stored in the lower address resolution message queue 204. At this time, the sender Ethernet address, that is, the Ethernet address requested by the ARP_REQUEST packet, becomes the Ethernet address assigned to the port on which the ARP_REQUEST packet is received. If it is an ARP_REPLY packet, it is ignored if the destination IP address is the received port itself. If the receiving port itself is not the destination, the ATM address cache 208 is searched for the ATM_ARP_REPLY packet using the ATM virtual channel set to the found ATM address. Send. At this time, the sending ATM address becomes the ATM address assigned to the port where the ARP_REPLY packet is received.

If the packet is an ATM ARP packet by RFC1577 received through the ATM access port, the IP address and ATM address of the sender are stored in the ATM address cache 208. If the ATM address is found by searching the ATM address cache 208 for the destination IP address in the case of an ATM_ARP_REQUEST packet, and if the ATM address is found, it responds with an ATM_ARP_REPLY packet, but does not exist in the ATM address cache 208. When an ARP_REPLY response is received by broadcasting the ARP_REQUEST packet for the destination IP address several times, the ATM_ARP_REPLY packet is transmitted to the ATM virtual channel set to the ATM side corresponding to the destination IP of the ATM_ARP_REQUEST packet, that is, the destination IP of the received ARP_REPLY packet. At this time, the sending ATM address is the ATM address of the port that received the ARP_REPLY packet. However, if the ARP_REPLY response is not received even after broadcasting a predetermined number of ARP_REQUEST packets, it indicates that address resolution is impossible with ATM_ARP_NAK packet. When receiving the ATM_ARP_REPLY packet, if the destination IP address is the server itself, the sending ATM address is stored in the ATM address cache 208, and if the destination IP address is found in the Ethernet address cache 207, the Ethernet connection to which the destination is connected. Send the ARP_REPLY packet to the destination using the Ethernet address of the port as the sender's Ethernet address, and forward the ATM_ARP_REPLY packet received through the ATM virtual channel set as the destination if the destination IP address is found in the ATM address cache 208. .

If the destination IP address of the received ARP_REQUEST or ATM_ARP_REQUEST packet belongs to a different IP subnet than the sender, RFC1577 is found if the server in the relevant subnet is found by searching the server address cache 209 for that IP subnet address. The ATM_ARP_REQUEST packet is transmitted through the ATM virtual channel set to the relevant server by using the source and destination IP addresses of the packet received by the ATM ARP. If the associated server cannot be found in the server address cache 209, the default router's Ethernet address or ATM address is reported in an ARP_REPLY or ATM_ARP_REPLY packet. Also, even if the destination IP address of the received ATM_ARP_REPLY or ATM_ARP_NAK packet belongs to an IP subnet different from the sender, if the server of the relevant subnet is found by searching the server address cache 209 for that IP subnet address, Delivers a packet received through the ATM virtual channel set to.

The Ethernet address cache 207 is a table that associates IP addresses, Ethernet addresses, and Ethernet connection port identifiers for Ethernet hosts on an Ethernet segment connected to an Ethernet connection port. RFC826's ARP is applied to cache registration of Ethernet hosts.

The ATM address cache 208 is a table that associates the IP addresses, ATM addresses, and ATM virtual channel identifiers established between a server and a host that belong to the same IP subnet as the server and have an ATM interface currently registered with the server. Inverse ATM ARP of RFC1577 may be applied for server registration of an ATM host.

The server address cache 209 is a table that associates IP addresses, ATM addresses, and ATM virtual channel identifiers set between servers that can be connected from the current server itself. The connection between the servers can be set up through the switching ATM virtual channel by the signaling function or by the permanent ATM virtual channel by the network manager. In this case, RFC1577's Inverse ATM ARP may also be applied for cache registration of the connected server.

The server connection manager 210 requests the signal processing unit 104 to perform a virtual connection setup for the ATM ARP or the inverse ATM ARP between the server and the ATM host, and receives and manages the setup response. And a server connection table 301 which stores an ATM address of a connected ATM host and a set virtual channel identifier.

FIG. 5 is a temporary configuration diagram of the client function unit of FIG. 2, wherein the client function unit 103 includes a client packet pool 211, a client address management unit 212, and a client packet relay unit 213. FIG.

The client packet pool 211 is a pool of packet queues that store addresses of packet memories in which IP packets exchanged between two hosts participating in communication are stored, and a packet queue is allocated to each host pair. Each packet queue is used in a FIFO manner, and the packet queue allocated to the host pair for which communication is terminated is returned. The client packet pool 211 checks a transmission / reception IP address of the received IP packet and stores it in the assigned packet queue.

The client address management unit 212 includes a client table 302 for storing destination address resolution information for a transmission / reception IP address pair, and a client connection table 303 for storing a virtual channel identifier assigned to a host pair participating in communication. The client address management unit 212 requests address resolution to the address resolution server function 102 for an IP address pair not stored in the client table 302 and sends an address resolution response from the address resolution server function 102. Received and stored in the client table 302. Information stored in the client table 302 is deleted if it is not used for a certain time. The client address manager 212 requests the signal processor 104 to establish a virtual channel for the host pair participating in the communication, receives a signal setup response from the signal processor 104, and stores the signal response in the client connection table 303. Information stored in the client connection table 303 is deleted when communication between the hosts is terminated.

The client table 302 stores the output port identifier of the packet for the transmit / receive IP address pair, the Ethernet address of the destination or the index of the associated client connection table 303 and the packet queue identifier.

The client connection table 303 stores an ATM address pair and an assigned virtual channel identifier corresponding to the host pair.

The client packet relay unit 213 refers to the client table 302 for the transmission / reception IP address pairs of the IP packets stored in the client packet pool 211, and together with the stored Ethernet address when the output port identifier indicates the Ethernet connection port. The packet address of the packet memory in which the IP packet to be transmitted stored in the client packet pool 302 is stored is transmitted to the packet transceiver unit 101 for transmission. If the output port identifier is an ATM access port, the address of the packet memory in which the IP packet to be stored stored in the client packet pool 302 is stored is transmitted to the packet transceiver 101 together with the assigned virtual channel identifier.

In addition, the signal processing unit 104 performs a signaling function on the connection establishment request received from the address resolution unit 102 and the client function unit 103 to establish a virtual channel capable of bidirectional communication with a destination. The generated signal packet is transmitted to the packet transmission / reception unit 101 together with the defined virtual channel identifier for the signal, and transmitted to the address resolution unit 102 or the client function unit 103 by the received signal response packet. Notify.

The configuration management unit 105 is used for notifying the network manager of the overall state of the server device or for allocating and changing an IP address and an ATM address for the server device. The management message defined between the configuration manager 105 and the network manager is exchanged. The virtual channel identifier used here may use a virtual channel identifier or a permanent ATM virtual channel identifier defined for management purposes. The generated message is transmitted to the packet transceiver 101 with the set virtual channel identifier.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention enables direct connection between a source and a destination using only a single ATM virtual channel connection, thereby eliminating connection-less service inefficiencies such as the Internet in an ATM network and effectively using resources. In addition, it is relatively inexpensive compared to a router, thereby enabling economical network construction capability.

Claims (4)

In the routing device for Internet service in asynchronous transmission mode network, Packet transmission / reception means for requesting address resolution by receiving a frame through a first access port, receiving cells through a second access port, merging cells in packet units, and reading a packet type field to request address resolution; First address resolution means for processing an address resolution request packet and an address resolution request message received from said packet transmission / reception means or storage means and delivering an address resolution response packet and an address resolution response message as an address resolution result; The storage means for checking a transmission / reception address of a packet received from the packet transmission / reception means and storing it in an allocated place, requesting address resolution to the first address resolution means for an unresolved address pair, and receiving and storing a response; ; Signal processing means for performing a signaling function on a virtual connection establishment request received from the first address resolution means or the storage means and delivering a result; And Configuration management means for transmitting and receiving a management message generated in relation to the network manager and notifying the network manager of the overall status of each component. Asynchronous transmission mode Internet protocol routing server device made, including. The method of claim 1, The packet transmission and reception means, The Ethernet address of the called party and the sending party is obtained from the first address resolution means to generate an Ethernet frame, and then transmitted, and a frame destined for the Ethernet address of the first access port is received, and the header of the frame is received. Ethernet frame processing means for reading a field of and passing it to said first address solving means or said storage means; After encapsulating the generated packet, the packet is divided and transmitted by asynchronous transmission mode cell unit, the received cells are merged by packet unit, and the packet type field of the encapsulated packet is read to solve the first address. Means and asynchronous transmission mode cell processing means for delivering to said storage means; And A packet memory for transmitting an address of a packet memory when the Ethernet frame processing means or the asynchronous transmission mode cell processing means delivers a packet to the first address resolution means or the storage means as a memory in which a received packet is stored. Asynchronous transmission mode Internet protocol routing server device comprising a. The method according to claim 1 or 2, The first address resolution means, An address resolution message queue for storing an address of said packet memory and a received access port identifier or for storing an address resolution request command from said storage means; Second address resolution means for processing an address resolution protocol packet located at an address of the packet memory stored in the address resolution message queue to resolve the address; And Address cache for storing the address of the access port corresponding to the address of the sender according to the address resolution protocol packet received through the first access port and the second access port. Asynchronous transmission mode Internet protocol server device comprising a. The method of claim 3, wherein The storage means, A client packet pool for allocating packet queues one by one for a pair of hosts participating in the communication, checking a transmission / reception address of the received packet, and storing the received packet in the assigned packet queue; Client address management means for requesting address resolution with the first address resolution means, requesting a virtual channel setting with a corresponding response and signal processing means, and storing and managing a response corresponding thereto; And Client packet relay means for transmitting to the packet transmission / reception means an address corresponding to an output port identifier and an address of a packet memory stored in the client packet pool. Asynchronous transmission mode Internet protocol routing server device comprising a.

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