JP2000165441A - Internet packet exchange device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute routes on a transfer line even when Internet packets are concentrated to a specified transfer destination and to reduce the deterioration of communication quality on the transfer line by providing a function for specifying the transfer destination physical transfer network address of a physical transfer network frame to be exchanged. SOLUTION: An Internet packet exchange device is provided with a function for specifying the transfer destination physical transfer network address of the physical transfer network frame to be exchanged from the transfer Internet address described in the header of the Internet packet and a transmission source physical transfer network address described in the header of the physical transfer network frame, which are made into a capsule in the received physical transfer network frame. For example, an Internet terminal 1 adds a physical transfer network header to an IP packet and transmits it to the Internet packet exchange device 4. The transfer destination physical transfer network address is dissolved by a transfer table which is set in the Internet terminal 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Internet packet switching apparatus suitable for providing a wide area Internet packet communication service using a connectionless physical frame transfer network, and more particularly, to a relay link and an Internet packet switching apparatus. The present invention relates to an Internet packet switching device that is effective in improving communication quality between terminals by distributing traffic load between relay nodes.

[0002]

2. Description of the Related Art Conventionally, an Internet packet which accommodates an interface port for a connectionless physical frame transfer network and which is encapsulated in the physical transfer network frame with respect to a physical transfer network frame received from the interface port. By referring to the contents of the header of the above, the transfer destination address of the physical transfer network frame is changed according to the contents, and the physical transfer network frame is transmitted again from the interface port, thereby being encapsulated in the physical transfer network frame. In the Internet packet switching device that exchanges Internet packets, when changing the transfer destination address of the physical transfer network frame,
Encapsulated in the received physical transport network frame,
It has a function of specifying the destination physical transfer network address of the physical transfer network frame to be replaced only from the destination Internet address described in the header of the Internet packet.

[0003]

In the conventional Internet packet switching apparatus, therefore, a plurality of packets to which the same transfer destination Internet address is assigned can only be transferred to the same route. When Internet packet transfer is concentrated, communication quality tends to deteriorate on the transfer path.

[0004] This tends to be particularly noticeable when there is a narrow band relay link on the relay path.

[0005] It is an object of the present invention to reduce the deterioration of communication quality on a transfer path by distributing routes on a transfer path even when Internet packets are concentrated on a specific transfer destination.

[0006]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, when the transfer destination address of the physical transfer network frame is changed, the physical transfer network frame is encapsulated in the received physical transfer network frame. Both the transfer destination Internet address described in the header of the Internet packet and the transmission source physical transfer network address described in the header of the physical transfer network frame encapsulating it, the transfer destination physical of the physical transfer network frame to be replaced It has a function of specifying a transfer network address.

According to the second aspect of the present invention, when further exchanging an Internet packet, an Internet packet transfer destination Internet address or a set thereof obtained at the time of the Internet packet exchange,
It has a function of transmitting information of a set of a destination physical transfer network address of a physical transfer network frame to be replaced to a physical frame transfer network terminal specified by a source address of the received physical transfer network frame. .

When the transfer destination address of the physical transfer network frame is changed, not only the transfer destination Internet address described in the header of the Internet packet, which is encapsulated in the received physical transfer network frame, but also is referred to. By referring to the source physical transfer network address described in the header of the encapsulated physical transfer network frame at the same time and specifying the destination physical transfer network address of the physical transfer network frame to be replaced, the same destination Internet Even an Internet packet to which an address is assigned can be distributed and transferred to a plurality of routes according to the contents of the source physical transfer network address of the physical transfer network frame encapsulating the Internet packet. As a result, the traffic load on the relay link is dispersed, and the deterioration of the transfer quality is reduced.

[0009] Further, information on a set of a destination Internet address or a set of destinations of an Internet packet and a destination physical transfer network address of a physical transfer network frame to be replaced is transmitted by a source address of the received physical transfer network frame. By having the function of transmitting to the specified physical frame transfer network terminal, subsequent Internet packets to the same transfer destination Internet terminal do not pass through the packet switching device that has been performing packet switching processing until now, The packet is transferred directly to the next-stage packet switching device on the physical frame transfer network, the traffic load of the relay packet switching device is dispersed, and the deterioration of the transfer quality is further reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of transfer processing of a packet addressed to the same IP address in a plurality of routes in an Internet communication apparatus according to the present invention. As an example, a connection between Internet service providers (hereinafter referred to as ISP) will be described.

Reference numeral denotes an Internet terminal, which processes IP packets. IP via connectionless transport network
It has an interface port of a physical transfer network for transmitting and receiving packets. A header in which a destination physical transfer network address and a source physical transfer network address are set for transmission to the physical transfer network is added. The transfer destination physical transfer network address is determined by a transfer table indicating the correspondence between the transfer destination IP address and the transfer destination physical transfer network address as shown in FIG. If the transfer destination IP address is not registered in the table, the physical transfer network address of the Internet packet switching device is set. Note that the transfer table shown in FIG. 2 is generated by frames received from the Internet packet switching device. FIG. 3 shows a transfer table in a conventional switching device.

Is a connectionless physical transfer network. The transfer is performed by the transfer destination physical transfer network address set in the physical transfer network header. Note that the physical transfer network address is assigned in a region hierarchy like a telephone number, and the region can be specified from a part of the upper order of the address.

Is a gateway (hereinafter referred to as GW). A plurality of GWs are installed in each region for load distribution.

Is an Internet packet switching device. It has an interface port for a physical transfer network for transmitting and receiving IP packets via a connectionless physical transfer network. Further, according to the transfer table of FIG.
The IP packet is transferred by analyzing the destination physical transfer network address from the P address and the source physical transfer network address, and replacing the transfer destination address.

FIG. 4 shows an example of a transfer table in the Internet packet switching apparatus, in which a "destination physical transfer network address" is given in correspondence with a "destination IP address", and a "source physical transfer network address". Upper bits "
It is shown.

In the conventional switching device, the destination physical transfer network address is determined from the transfer table (for example, as shown in FIG. 3, the destination physical transfer network address is analyzed only from the destination IP address). Only one destination physical transfer network address can be set for the destination IP address.

On the other hand, the Internet packet switching apparatus can set the destination physical transfer network address not only from the destination IP address but also from the source physical transfer network address as shown in FIG. On the other hand,
A plurality of destination physical transfer network addresses can be specified.

A www server is accommodated by an Internet service provider ISP connected to a connectionless physical transfer network via a router.

Is a relay link. Since the line speed is limited, when a large number of packets are transmitted, quality degradation occurs.

Is a router. The terminal accommodates an Internet terminal such as a www server, and is connected to a network by a relay link.

The following is a description of IS using the Internet communication device.
FIG. 1 shows a transfer processing procedure of a packet addressed to the same IP address by a plurality of routes in the connection between Ps.
The description will be made in correspondence with the procedures of 3, 4, and 5.

1. The Internet terminal adds a physical transfer network header to the IP packet and transmits the IP packet to the Internet packet switching device. Note that the destination physical transfer network address in the physical transfer network header is resolved from the destination IP address by the transfer table set in the Internet terminal of FIG. However, if the transfer destination IP address does not exist in the entry, the physical transfer network address of the Internet packet switching device is set. As for the source physical transfer network address, the physical transfer network address of the own terminal is fixedly set.

2. The Internet packet switching device refers to the transfer table of FIG. 4 and resolves the destination physical transfer network address by considering not only the destination address of the IP header of the received packet but also the source address of the physical transfer network header. .

3. The Internet packet switching device replaces the transfer destination physical transfer network address with the physical transfer network address resolved in the previous section, and transmits the packet to the GW.
At the same time, the IP address and the destination physical transfer network address are notified to the source physical transfer network address.

4. The GW transfers the IP packet to the www server via the relay link and the router.

[5] The Internet terminal adds an entry to the transfer table of FIG. 2 based on the transfer destination IP address and the transfer destination physical transfer network address received from the Internet packet switching apparatus, and from the next IP packet, adds the physical address of the GW to the transfer destination physical transfer network address. Set the transfer network address and send.

As described above, according to the above description of the present invention, when only one route to the same IP address is set, the gateway and the relay line, which are connection points, as shown in FIG. Since it is limited to one, it may be a bottleneck. In such a case, the processing load can be distributed by performing the transfer processing on a plurality of routes as shown in FIG.

[0028]

As described above, according to the first aspect of the present invention,
Even if an Internet packet is given the same destination Internet address, it can be transferred to a plurality of routes in a distributed manner. This load distribution can reduce the traffic load on the relay link.

According to the second aspect of the present invention, in addition, when Internet packets are continuously transferred to the same transfer destination Internet terminal, the traffic load on the relay node can be reduced.

By these synergistic effects, it is possible to minimize the deterioration of the transfer quality.

[Brief description of the drawings]

FIG. 1 is an example of a transfer process of a packet addressed to the same IP address in a plurality of routes in an Internet communication device.

FIG. 2 is a transfer table in an Internet terminal.

FIG. 3 is a transfer table in a conventional switching device.

FIG. 4 is a transfer table in the Internet packet switching device.

FIG. 5 is an example of a transfer process using a single route to the same IP address terminal.

FIG. 6 is an example of a transfer process using a plurality of routes to the same IP address terminal.

[Description of Signs] Internet Terminal Connectionless Physical Transfer Network Gateway (GW) Internet Packet Switching Device www Server Relay Link Router

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Naoya Kugutsu, Inventor 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Japan Telegraph and Telephone Corporation (72) Inventor Hiroyuki Hara 3--19, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 2 Nippon Telegraph and Telephone Corporation F term (reference) 5K030 GA11 HA08 HD03 HD09 LB05 LB18 5K033 CB08 CC01 DB14 DB18 EC03 9A001 CC07 DD10 JJ25 KK56 LL09

Claims (2)

[Claims] An interface port for a connectionless physical frame transfer network is accommodated. For a physical transfer network frame received from the interface port, a header of an Internet packet encapsulated in the physical transfer network frame is included. Refers to the contents, changes the transfer destination address of the physical transfer network frame according to the contents, and transmits the physical transfer network frame again from the interface port, whereby the Internet packet encapsulated in the physical transfer network frame is transmitted. In the Internet packet switching device that performs the switching, when the transfer destination address of the physical transfer network frame is changed, the packet is encapsulated in the received physical transfer network frame.
Both the destination Internet address described in the header of the Internet packet and the source physical transport network address described in the header of the physical transport network frame encapsulating it, the physical destination network of the physical transport network frame to be replaced An internet packet switching device having a function of specifying a transfer network address. 2. The internet packet switching apparatus according to claim 1, wherein when the internet packet is exchanged, the internet packet transfer destination internet address or a set thereof obtained at the time of the internet packet exchange, and a physical transfer network to be replaced. An internet packet switching apparatus having a function of transmitting information of a set of a physical transfer network address of a frame transfer destination to a physical frame transfer network terminal specified by a source address of a received physical transfer network frame.