KR20060054250A - Multicast switching apparatus and method for transmitting multicast data packet using by it - Google Patents

Abstract

The present invention encapsulates and transmits a multicast data packet. To this end, the present invention relates to a conventional method of generating a transmission header required to transmit a multicast data packet in a multicast switching apparatus and transmitting the multicast data packet. In contrast, when a random data packet is received in a multicast switching apparatus that transmits multicast data, it is checked whether the corresponding data packet is a multicast data packet, and then multicasts the multicast data packet in the case of the multicast data packet. Multicast data by replicating with reference to transmission table information, encapsulating duplicated multicast data packets with reference to multicast transmission table information, and transmitting encapsulated multicast data packets with reference to unicast transmission table information When a packet is received, With reference to a multicast forwarding table information, replication and encapsulation it is to effectively transmit the multicast data packet.

Multicast Data, Unicast Data, Encapsulation

Description

MULTICAST SWITCHING APPARATUS AND METHOD FOR TRANSMITTING MULTICAST DATA PACKET USING BY IT}

1 is a configuration diagram of a communication network suitable for transmitting a conventional multicast data packet;

2 is a block diagram of a multicast switching device suitable for encapsulating and transmitting a multicast data packet according to the present invention;

3 illustrates a multicast routing table structure referenced for encapsulating multicast data packets in accordance with the present invention;

4 is a flowchart illustrating a process of encapsulating and transmitting a multicast data packet according to the present invention.

<Description of Symbols for Main Parts of Drawings>

202: packet receiving unit 204: packet separating unit

206: packet replication section 208: multicast transmission table section

210: packet encapsulation unit 212: packet transmission unit

214: unicast transmission table unit

The present invention relates to a technique for transmitting a multicast data packet, and more particularly, to a multicast switching apparatus suitable for encapsulating and transmitting a multicast data packet in a multicast switching apparatus, and a multicast data packet transmission method using the same. will be.

As is well known, the Internet is a transmission control protocol / internet (TCP / IP) between a plurality of unit networks separated by an IP address and a plurality of host ems having individual IP addresses provided in each unit network. For example, data communication that performs data communication using a local area network (LAN), a public switched telephone network (PSTN), an asymmetric digital subscriber line (ADSL), or the like based on a protocol. Network. Here, the host means a computer terminal having a communication modem, a computer terminal and a telephone are connected, etc., and can communicate with each other only with a unique IP address assigned to each host.

1 is a block diagram of a communication network suitable for transmitting a conventional multicast data packet, and includes a multicast transmission server, a plurality of multicast switching devices, a plurality of wired receivers, and a plurality of wireless receivers.

Referring to FIG. 1, in IP multicast, a multicast switching device for multicast data communication is installed at a specific point of the Internet network, for example, a plurality of transmissions. In the destination address, the multicast data packet is transmitted using the multicast address, and the multicast switching device receives one multicast data packet transmitted from the multicast transmission server, and requires multicast data in its own network. A plurality of multicast data packets are transmitted to a switching device or a receiver.

In a communication network transmitting such a multicast data packet, a single line is connected between the multicast transmitting server side and the nearest multicast switching device, and a plurality of lines are connected between the multicast switching device and other multicast switching devices and a plurality of wired and wireless receivers. Because it can be used to reduce the bandwidth of a circuit, it can be greatly effected in the transmission of a large amount of multimedia data packets or a long distance communication line.

However, in order to transmit multicast data packets in a conventional multicast switching apparatus, a path for a multicast tree is established, and the multicast switching apparatus tunnels with each other to maintain a multicast tree. In order to generate a new transmission header, the switching device is implemented in the form of a server, and accordingly, there is a problem in that a large delay is required to transmit a multicast data packet.

Accordingly, the present invention is to solve the above-described problems of the prior art, when configuring a multicast tree using tunneling between the multicast switching apparatus multi-capable to encapsulate the multicast data packet through the multicast transmission table and transmit An object of the present invention is to provide a cast exchange device and a multicast data packet transmission method using the same.

Another object of the present invention is to provide a multicast transmission apparatus and a multicast data packet transmission method capable of encapsulating and transmitting a multicast data packet through a multicast transmission table in a multicast exchange apparatus using unicast transmission logic. To provide.

In accordance with one aspect of the present invention, there is provided a multicast switching apparatus for transmitting multicast data. When an arbitrary data packet is received, the present invention checks whether the corresponding data packet is a multicast data packet or a unicast data packet. And a packet separator which separately classifies and transmits each packet; a packet copy unit which receives the corresponding data packet when the corresponding data packet is a multicast data packet, and replicates the number of packets to be branched by referring to the multicast transmission table information; and the duplicated multicast data packet A packet encapsulating unit according to a corresponding exchange device address with reference to the multicast transmission table information, and a packet transmitting the encapsulated multicast data packet according to a corresponding exchange device address with reference to unicast transmission table information Multicast exchange device including a transmission unit The ball.

In another aspect for achieving the above object, the present invention provides a method for transmitting a multicast data packet in a multicast switching apparatus for transmitting multicast data, wherein when an arbitrary data packet is received, the received data packet is multiplied. Checking whether it is a cast data packet, replicating the multicast data packet with reference to multicast transmission table information in the case of the multicast data packet, and copying the duplicated multicast data packet to the multicast transmission table. A method of transmitting a multicast data packet of a multicast switching apparatus, the method comprising: encapsulating with reference to information and transmitting the encapsulated multicast data packets with reference to unicast transmission table information.

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

A key technical aspect of the present invention is that when an arbitrary data packet is received in a multicast switching apparatus that transmits multicast data, if the received data packet is a multicast data packet, it duplicates by referring to the multicast transmission table, and duplicates it. Encapsulated multicast data packets with reference to a multicast transmission table and transmitting encapsulated multicast data packets with reference to a unicast transmission table, and through this technical means, easily achieve the object of the present invention. can do.

2 is a block diagram of a multicast exchange apparatus suitable for encapsulating and transmitting a multicast data packet according to the present invention, and includes a packet receiver 202, a packet separator 204, a packet copy unit 206, and a multicast transmission. The table unit 208, the packet encapsulation unit 210, the packet transmitter 212 and the unicast transmission table unit 214 are included.

Referring to FIG. 2, when the packet receiver 202 receives a data packet and transmits it to the packet separator 204, the packet separator 204 determines whether the received data packet is a multicast packet or not according to IP header information. After checking whether the packet is a unicast packet, the packet is transmitted to the packet replication unit 206 in the case of the multicast packet, and transmitted to the packet transmitter 212 in the case of the unicast packet.

In addition, the packet replication unit 206 refers to the multicast transmission table information stored in the multicast transmission table unit 208 to copy the multicast packet transmitted according to the number of branched packets. This is transmitted to the packet encapsulation unit 210. At this time, the multicast transmission table unit 208 increases the number of packets to be branched when a new multicast service start request message arrives at the corresponding multicast address, and adds the address of the counterpart multicast switching device. On the other hand, when the multicast service interrupt request message arrives, the number of packets to be branched is reduced, and the address of the counterpart multicast switching device is deleted.

As an example, FIG. 3 is a diagram illustrating a multicast transmission table structure referred to for encapsulating multicast data packets according to the present invention, and includes a multicast address, a number of packets to be replicated, a counterpart multicast switching device address, and the like. Can be.

Next, the packet encapsulation unit 210 exchanges the counterpart multicast data with reference to the multicast transmission table information stored in the multicast transmission table unit 208 according to the number of branched packets. It encapsulates (encapsulates) the device according to the address of the device and delivers one or more multicast data packets to the packet transmitter 212.

Finally, the packet transmission unit 212 refers to the unicast transmission table information stored in the unicast transmission table unit 214 for the encapsulated multicast data packets and the unicast data packets of the multicast switching apparatus. Send multicast data packets to the address. Here, the multicast transmission table information and the unicast transmission table information are addresses used for exchanging packets, information including physical addresses and logical addresses of the switching device and the communication terminal, for example, IPv4 address, IPv6 address. , MAC address, MPLS label, and the like.

Therefore, the multicast transmission apparatus of the present invention described above may transmit and transmit the multicast data packet to the corresponding exchange device address by replicating and encapsulating the multicast data packet according to the multicast transmission table information using unicast transmission logic.

Next, it is checked whether the data packet received at the multicast switching apparatus having the above-described configuration is a multicast data packet, duplicates the multicast data packet with reference to the multicast transmission table, and duplicates the multicast data packets. A process of transmitting multicast data packets by encapsulating with reference to a multicast transmission table and referring to a unicast transmission table will be described.

4 is a flowchart illustrating a process of encapsulating and transmitting a multicast data packet according to the present invention.

4, in the standby mode of the multicast switching apparatus (step 402), it is checked whether any data packet is received by the packet receiver 202 (step 404).

As a result of the check in step 404, if a data packet is received, the packet receiver 202 forwards it to the packet separator 204, and the packet separator 204 transmits the data packet according to the IP header information. It is checked whether it is a multicast data packet (step 404). That is, the packet separator 204 checks whether the data packet to be delivered is a multicast data packet or a unicast data packet.

As a result of the check in the step 406, if the data packet is a multicast data packet, the packet replication unit 206 stores the multicast transmission table information stored in the multicast transmission table unit 208 for the multicast packet transmitted. The multicast data packet is replicated according to the number of branched packets with reference to the packet encapsulation unit 210 (step 408).

In addition, the packet encapsulation unit 210 refers to the multicast transmission table information stored in the multicast transmission table unit 208 for multicast data packets replicated according to the number of branched packets. Encapsulation (encapsulation) according to the address is delivered to the packet transmission unit 212 (step 410). As an example, as shown in FIG. 3, the multicast transmission table may include a multicast address, a number of packets to be replicated, a counterpart multicast switching device address, and the like.

Next, the packet transmitter 212 multicasts one or more encapsulated multicast data packets to the address of the corresponding multicast exchange apparatus by referring to the unicast transmission table information stored in the unicast transmission table unit 214. Send data packets (step 412).

On the other hand, as a result of the check in step 406, if the data packet is not a multicast data packet, that is, a unicast data packet, the packet separator 204 sends the unicast data packet to the packet transmitter 212. And the packet transmitter 212 refers to the unicast data packet transmitted from the packet separator 204 by referring to the unicast transmission table information stored in the unicast transmission table 214. A unicast data packet is sent to the address (step 414). Here, the unicast transmission table information may include, for example, a data packet address, a counterpart switching device address, and the like, and the multicast transmission table information and the unicast transmission table information are addresses used for exchanging packets, Information including physical and logical addresses of the switching device and the communication terminal may include, for example, an IPv4 address, an IPv6 address, a MAC address, an MPLS label, and the like.

Therefore, in the multicast data packet transmission method of the present invention described above, when the data packet received by the multicast switching apparatus is a multicast data packet, the multicast data packet transmission is duplicated according to the number of branch packets by referring to the multicast transmission table and the counterpart multicast switching apparatus. The multicast data packet can be transmitted by encapsulating according to the address.

In the above description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto, and a person having ordinary skill in the art to which the present invention pertains may have various limitations without departing from the technical spirit of the present invention. It will be readily appreciated that various substitutions, modifications and variations are possible.

As described above, the present invention is different from the conventional method of generating a transmission header required for transmitting a multicast data packet in a multicast switching apparatus and transmitting the multicast data packet, and thus, multicast switching apparatus for transmitting multicast data. When an arbitrary data packet is received in the UE, the received data packet is replicated by referring to the multicast transmission table when the received data packet is a multicast data packet, encapsulated replicated multicast data packets by referring to the multicast transmission table, and By transmitting the encapsulated multicast data packets by referring to the unicast transmission table, when the multicast data packets are received, the multicast data packets are copied and encapsulated by referring to the multicast transmission table, and then the corresponding multicast data packets are used in the unicast transmission table. Of multicast packets By shortening the time of copy and exchange processing, transmission can be made more efficient.

In addition, by adding a transmission module according to the present invention to an existing unicast switching device using unicast transmission logic and using it as a multicast switching device, the multicast switching device can be easily implemented.

Claims (11)

A multicast exchange device for transmitting multicast data, When an arbitrary data packet is received, a packet separator for checking and classifying whether the corresponding data packet is a multicast data packet or a unicast data packet, and forwarding them separately, A packet replication unit which receives the corresponding data packet when the corresponding data packet is a multicast data packet, and duplicates the number of packets to be branched by referring to the multicast transmission table information; A packet encapsulation unit for encapsulating the replicated multicast data packet according to a corresponding exchange device address with reference to the multicast transmission table information; A packet transmitter for transmitting the encapsulated multicast data packet according to a corresponding exchange device address with reference to unicast transmission table information Multicast exchange device comprising a. The method of claim 1, The multicast exchange device, A multicast transmission table section having the multicast transmission table information for replication and encapsulation of the multicast data packet; Unicast transmission table unit having the unicast transmission table information for transmission of the multicast data packet and the unicast data packet Multicast switching device further comprising. The method of claim 1, The packet transmission unit receives the data packet when the data packet is a unicast data packet and transmits the packet based on the corresponding exchange device address with reference to the unicast transmission table information. The method according to any one of claims 1 to 3, And the multicast transmission table information and the unicast transmission table information include physical addresses and logical addresses of the switching device and the communication terminal. The method of claim 4, wherein The multicast transmission table information includes a multicast address, a number of packets to be replicated, and a relative multicast switching device address. The method of claim 4, wherein The unicast transmission table information includes a data packet address and a counterpart switching device address. A method of transmitting a multicast data packet in a multicast exchange apparatus transmitting multicast data, When any data packet is received, checking whether the received data packet is the multicast data packet; Duplicating the multicast data packet with reference to multicast transmission table information in the case of the multicast data packet; Encapsulating the replicated multicast data packets with reference to the multicast transmission table information; Transmitting the encapsulated multicast data packets with reference to unicast transmission table information Multicast data packet transmission method of a multicast switching apparatus comprising a. The method of claim 7, wherein The transmission method, Transmitting the unicast packet with reference to the unicast transmission table information when the result is the unicast packet The multicast data packet transmission method of the multicast switching device further comprising. The method according to claim 7 or 8, The multicast transmission table information and the unicast transmission table information include physical addresses and logical addresses of the switching device and the communication terminal. The method of claim 9, The multicast transmission table information includes a multicast address, a number of packets to be duplicated, and a relative multicast switching device address. The method of claim 9, The unicast transmission table information includes a data packet address and a counterpart switching device address.

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