KR100428312B1 - Method for operating a packet to support routing protocol - Google Patents

Abstract

The present invention relates to a packet operating method for supporting a routing protocol, and in the present invention, through the interworking operation of an ATM router and an ATMARP server, the processing of another packet, for example, an ARP packet, by adding a processing of a routing protocol packet. Proceed separately.

When the present invention is achieved, the ATM network system is based on the IPOA protocol and can freely process not only ARP packets but also routing protocol packets such as broadcast packets, multicast packets, and so on. Even in a configured ATM network, the effect of freely using a routing protocol can be easily obtained.

Description

Method for operating a packet to support routing protocol

The present invention relates to a method of operating a packet, and more particularly, to flexibly induce easy processing of a routing protocol packet such as a broadcast packet and a multicast packet. The present invention relates to a packet operation method for supporting a routing protocol.

In recent years, with the rapid increase in multimedia communications, various services using an asynchronous transfer mode (ATM) network system have been widely implemented.

This conventional ATM network system is based on any communication protocol, such as IPOA (IPOA) (hereinafter referred to as "IPOA") protocol (Protocol), to provide a series of packet services, In this case, the IPOA protocol uses, for example, RFC 1483 established by the Internet Engineering Task Force (IETF) as a standard.

See, for example, U.S. Patent No. 5757783, "Method and apparatus for routing ATM cells in an AD-ATM LAN," US Patent Publication No. 5796736, "ATM Network TOEFL." ATM network topology auto discovery method ", US Patent No. 5878043" ATM LAN emulation, US Patent No. 6052383 "LAN to ATM backbone switch module module) "and the like are described in detail as an example of the conventional ATM network system described above.

Such a conventional ATM network system is commonly referred to as an ATM terminal, ATM router, etc. operating as an IPOA client, and a series of address resolution protocols (ARPs) for these IPOA clients. ) Is a combination of ATMARP server providing information, in this case, ATMARP server, ATM terminal, ATM router, etc. form a series of smooth communication connection by a switch (Switch).

However, such conventional ATM network systems, such as ATM network systems based on the IPOA protocol, can only process "general data", "ARP packets", for example broadcast packets, multicast packets, and the like. There is a fundamental problem that cannot handle the same routing protocol packet.

As such, the fundamental reason why the ATM network system based on the conventional IPOA protocol cannot process the routing protocol packet other than the ARP packet is that the conventional IPOA protocol merely uses the "ARP using static routing information." Only a packet processing method "is proposed, and no specific method for processing a routing protocol packet such as a broadcast packet or a multicast packet is provided.

Due to this problem, in the conventional case, only a permanent virtual channel (PVC), in which a virtual channel connection (VCC) is hereinafter set to static, is statically set. The IPOA protocol could only be used in an ATM network configured as an IP network, but the IPOA protocol was configured in an ATM network composed of a switched virtual channel (SVC), in which the VCC is dynamically set. There was a difficulty in applying it.

Accordingly, an object of the present invention is to provide a series of additional functions to an ATM router, an ATMARP server, etc. constituting an ATM network system, thereby improving the function of the IPOA, and thus, even in an ATM network based on the IPOA protocol, In addition to the processing, the processing of routing protocol packets such as broadcast packets, multicast packets, and the like can be freely performed.

Another object of the present invention is to induce the use of a routing protocol in an ATM network composed of SVC through the above-described improvement of IPOA.

Still other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

1 conceptually illustrates an ATM network system based on the IPOA protocol for implementation of the present invention;

2 is a flowchart sequentially illustrating a packet operating method for supporting a routing protocol according to an aspect of the present invention.

3 is a flowchart sequentially illustrating a packet operating method for supporting a routing protocol according to another aspect of the present invention.

4 is an exemplary diagram conceptually showing an ATMARP table held by an ATM client / ATMARP server.

5 shows an example of a header of a packet.

In order to achieve the above object, the present invention discloses a first and second packet processing process that is independently performed in a state where ATMARP server and ATM clients are networked through a series of ATM networks.

In this case, the first packet processing may include determining whether a series of packet transmission events have been generated from any specific ATM client, for example, any specific ATM router, and when a packet transmission event has been generated from a specific ATM router, Determining whether the corresponding packet to be transmitted by a specific ATM router is a routing protocol packet; if the packet is a routing protocol packet, checking and storing the VCC associated with the specific ATM router; A combination of the steps of transmitting the packet to the VCC connected to the ATM router.

In the case of the present invention, since the processing of the routing protocol packet proceeds separately from the processing of other packets, for example, the ARP packet by the interworking action of the ATM router and the ATMARP server, when the present invention is achieved, the ATM network While the system is based on the IPOA protocol, the system can freely handle not only ARP packets but also routing protocol packets such as broadcast packets, multicast packets, and so on, even in an ATM network composed of SVCs. It becomes possible.

Hereinafter, a packet operation method for supporting a routing protocol according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, an ATM network system for implementing the present invention includes an ATMARP server 10 and ATM routers 21, 22, and 23 connected based on an ATM network 100 using an IPOA protocol. It consists of a combination of terminals 31 and 32. In this case, some ATM routers 21 and 22 form a networked structure with a plurality of client PCs 41 and 42 based on a LAN network.

At this time, the ATM routers 21, 22 and 23 and the ATM terminals 31 and 32 operate as ATM clients, and the ATMARP server 10 serves to provide a series of ARP information to these ATM clients. .

Hereinafter, a packet operating method for supporting a routing protocol of an ATM network system having the above-described configuration will be described in detail.

As shown in Figures 2 and 3, the packet operation method for supporting the routing protocol to achieve the subject of the present invention is a system that the ATM routers (21, 22, 23) and ATMARP server 10 proceeds independently of each other. It consists of a combination of one packet process (step SA) and a second packet process (step SB). Of course, while the first and second packet processing is in progress, the ATM routers 21, 22, 23 and the ATMARP server 10 maintain a close networking state with each other through the ATM network 100.

First, as shown in FIG. 2, the ATM routers 21, 22, 23, for example, the ATM router 21 open a series of VCCs with the ATMARP server 10, and the ATMARP server 10. The process of registering its own mapping information (Mapping information) in progress, in conjunction with this, as shown in Figure 3, ATMARP server 10 establishes a series of VCC with ATM routers (21, 22, 23) In addition, a process of collectively storing mapping information of each ATM router 21, 22, and 23 is performed.

In this case, as shown in FIG. 2, the ATM router 21 proceeds to transmit a series of ATM signals to the ATMARP server 10 (step S10), and meshes with the ATMARP server 10 as shown in FIG. 3. As shown in FIG. 1, a process of determining whether the previous ATM signal has been transmitted from the ATM router 21 is performed (step S100).

At this time, if no ATM signal is transmitted from the ATM router 21, the ATMARP server 10 proceeds to step S101 to maintain a series of standby states.

However, when there is a transmission of a series of ATM signals from the ATM router 21, the ATMARP server 10 establishes a series of VCCs between the ATM router 21 which has transmitted this ATM signal and itself, and opens the ATM router 21. ) Is connected to the VCC (step S102).

After the VCC connection process is completed, the ATMARP server 10 sends a series of request messages to the corresponding ATM router 21, and the " Internet Protocol address information possessed by the corresponding ATM router 21 " Request to send (step S103).

In conjunction with this, as shown in Fig. 2, the ATM router 21 determines whether or not a "message requesting to transmit its own IP address information" has been transmitted from the ATMARP server 10.

At this time, if the "message requesting to transmit the IP address information" has not been transmitted from the ATMARP server 10, the ATM router 21 advances the flow to step S12 to maintain a series of standby states.

However, if the " message requesting to transmit the IP address information " has been transmitted from the ATMARP server 10, the process of transmitting its IP address information to the ATMARP server 10 is performed (step S13).

In conjunction with this, as shown in Fig. 3, the ATMARP server 10 determines whether or not "IP address information" has been transmitted from the ATM router 21 (step S104).

At this time, when it is determined that "IP address information" has not been transmitted from the ATM router 21, the ATMARP server 10 advances the flow to step S105 to maintain a series of standby states.

However, if it is determined that "IP address information" has been transmitted from the ATM router 21, the ATMARP server 10 stores the "IP address information" in the IP address information item of the ATMARP table as shown in FIG. In addition, " ATM address information " of the ATM router 21 based on the IP address information is stored in the ATM address information item of the ATMARP table (step S106).

When the above-described process is completed and completed for all ATM clients constituting LIS (Logic IP Subnetwork) of the ATM network 100, for example, all ATM routers 21, 22, and 23, the ATMARP server 10 The "IP address and ATM address mapping information" of all ATM routers 21, 22 and 23 can be grasped and held collectively, and all ATM routers 21, 22 and 23 are ATMARP server 10. And a series of VCCs can be formed.

On the other hand, in the state where the foregoing process is completed, as shown in FIG. 2, the ATM router 21 determines whether a series of packet transmission events have occurred from any place, for example, the client PC 41. The process proceeds (step S14).

At this time, when it is determined that a series of packet transmission events have not occurred from the client PC 41, the ATM router 21 advances the flow to step S15 to maintain a series of standby states.

However, if it is determined that a series of packet transmission events have occurred from the client PC 41, the ATM router 21 has a destination address field included in the IP header of the packet transmitted from the client PC 41. (Destination address field) is searched, and based on the search result, it is determined whether the packet is a routing protocol packet such as a broadcast packet, a multicast packet, or the like (steps S16 and S17).

At this time, the ATM router 21 in which the present invention is implemented determines that the packet is a broadcast packet when the destination address field value included in the IP header of the packet is, for example, "255.255.255.255", and the destination address. When the field value is, for example, "224.0.0.9", "224.0.0.5", "224.0.0.6", etc., this packet is determined as a multicast packet.

In the above-described steps S16 and S17, the destination address field value included in the IP header of the packet transmitted from the client PC 41 has the preceding "255.255.255,255", "224.0.0.9", "224.0.0.5", " 224.0.0.6 "and the like, and if it is determined that the packet is a packet other than a routing protocol packet, for example, an ARP packet, the ATM router 21 may " an ATM router 21 to transmit a packet " Then, the IP address information of the ATM router 22 is transmitted to the ATMARP server 10, and, for example, "a process of grasping the ATM address information of the ATM router 22" is performed (step S18).

In conjunction with this, as shown in Fig. 3, the ATMARP server 10 refers to the IP address information of the ATM router 22, searches the above-mentioned ATMARP table, and finds the ATM address information of the corresponding ATM router 22. Then, the process of transmitting the ATM address information of the counterpart ATM router 22, which has been completed, to the ATM router 21 is performed (steps S110 and S111).

Correspondingly, the ATM router 21 judges whether the ATM address information of the counterpart ATM router 22 requested by the ATMARP server 10 has been transmitted as shown in Fig. 2 (step S19).

At this time, when the ATM address information of the counterpart ATM router 22 requested by the ATMARP server 10 is not transmitted, the ATM router 21 advances the flow to step S20 to maintain a series of standby states.

However, when the ATM address information of the counterpart ATM router 22 requested by the ATMARP server 10 is transmitted, the ATM router 21 sets "IP address information" and "ATM address information" of the counterpart ATM router 22. And the like, divided into IP address information items and ATM address information items of the ATMARP table, and the like. Based on the mapping information obtained through the above-described process, a new VCC is established with the counterpart ATM router 22, and the previous client PC is opened. The packet transmitted from 41 is transmitted to this new VCC (step S22).

On the other hand, in the above-described step S17, the destination address field value included in the IP header of the packet transmitted from the client PC 41 has the preceding "255.255.255,255", "224.0.0.9", "224.0.0.5", " If it is determined that the packet is a routing protocol packet having a value of 224.0.0.6, the ATM router 21 transmits the packet to the aforementioned "VCC connected to the ATMARP server 10". (Step S24).

In conjunction with this, as shown in Fig. 3, the ATMARP server 10 proceeds with a process of determining whether or not a series of packet transmission events have occurred, for example, from the ATM router 21 (step S107).

At this time, if it is determined that a series of packet transmission events have not occurred from the ATM router 21, the ATMARP server 10 proceeds to the flow to step S108, and maintains a series of standby states.

However, if it is determined that a series of packet transmission events have occurred from the corresponding ATM router 21, the ATMARP server 10 may include an Ether type field included in the "packet header" as shown in FIG. ), And based on the search result, it is judged whether or not the packet is a routing protocol packet (step S109).

In this case, the ATMARP server 10 in which the present invention is implemented determines the packet as a routing protocol packet when the Ether type field value included in the header of the packet has a structure such as, for example, “0x0800”. When the field value has a structure such as "0x0806", this packet is judged as general data, for example, ARP packet.

In the above-described step S109, the Ether type field value included in the header of the packet transmitted from the ATM router 21 has a structure such as "0x0806" so that the packet is not a routing protocol packet, but is another packet, for example, ARP. If it is determined that the packet is, the ATMARP server 10 determines that the ATM router 21 is, for example, "to grasp the ATM address information of the counterpart ATM router 22", and the flow is described above in step S110; Proceed to S111.

However, when the Ether type field value included in the header of the packet transmitted from the ATM router 21 has a structure such as "0x0800", and the packet is determined to be a routing protocol packet, the ATMARP server 10 indicates that " It is determined that the VCC utilized for the input of the packet is, for example, "VCC connected to the ATM router", and the process of storing the corresponding VCC is performed (step S112).

The VCC stored as described above is used flexibly to forward this routing protocol packet when another routing protocol packet is input later.

Thereafter, the ATMARP server 10 completes the present invention by transmitting a packet transmitted from the ATM router 21 to another ATM router, for example, a VCC to which the ATM router 22 is connected (step S113).

As described above, in the present invention, the processing of the routing protocol packet is added through the interworking operation of the ATM router and the ATMARP server, so that the present invention proceeds separately from the processing of other packets, for example, ARP packets. When achieved, the ATM network system is based on the IPOA protocol and can freely handle not only ARP packets but also routing protocol packets such as broadcast packets, multicast packets, and so on, even in ATM networks configured with SVC. Therefore, the effect of freely using a routing protocol can be easily obtained.

Claims (6)

Asynchronous Transfer Mode Address Resolution Protocol (ATMA) server and ATM clients are networked through a series of ATM networks, each consisting of a first packet process and a second packet process independently. The first packet processing step may include establishing a series of virtual channel connecting (VCC) with the ATM clients and storing mapping information of the ATM clients in a batch; Determining whether a series of packet transfer events has occurred from any particular ATM client; When the packet transmission event is generated from the specific ATM client, determining whether the corresponding packet to be transmitted by the specific ATM client is a routing protocol packet; If the corresponding packet is a routing protocol packet, checking and storing the VCC connected to the specific ATM client, and transmitting the packet to the VCC connected to the counterpart ATM client requested by the specific ATM client. Packet operation to support the protocol. The method of claim 1, wherein the second packet processing comprises: establishing a series of VCCs with the ATMARP server, and registering a series of mapping information with the ATMARP server; Determining whether a series of packet transfer events has occurred from any place; When the packet transmission event occurs from any place, determining whether the corresponding packet transmitted from any place is a routing protocol packet; If the packet is a routing protocol packet, transmitting the packet to the VCC connected with the ATMARP server. The method of claim 2, wherein the registering of the mapping information in the ATMARP server comprises: Transmitting a series of ATM signals to the ATMARP server; Determining whether transmission of IP address information is requested from the ATMARP server; And when the transmission of the IP address information is requested from the ATMARP server, transmitting the corresponding IP address information to the ATMARP server. The method of claim 2, further comprising: transmitting the IP address information of the counterpart ATM client to the ATMARP server if it is determined that the packet is not a routing protocol packet; Determining whether ATM address information of the counterpart ATM client has been transmitted from the ATMARP server; When the ATM address information of the counterpart ATM client is transmitted from the ATMARP server, the counterpart ATM client stores IP address information and ATM address information, establishes a series of VCCs with the counterpart ATM client, and opens the established VCC. The packet operating method for supporting a routing protocol, characterized in that the step of transmitting the packet further proceeds. The method of claim 1, wherein the step of collectively storing the mapping information of the ATM clients Determining whether a series of ATM signals has been sent from any particular ATM client; When the ATM signal is transmitted from the specific ATM client, establishing the VCC with the specific ATM client and requesting IP address information from the specific ATM client; Determining whether the IP address information has been transmitted from the specific ATM client; When the IP address information is transmitted from the specific ATM client, storing the IP address information and storing ATM address information of the specific ATM client determined based on the IP address information. Packet operation to support the protocol. 2. The method of claim 1, wherein if it is determined that the packet is not a routing protocol packet, the ATM address of the counterpart ATM client requested by the particular ATM client is retrieved, and the ATM address of the counterpart ATM client is transmitted to the particular ATM client. Packet operating method for supporting a routing protocol, characterized in that the step further proceeds.