Communication method, communication system, and gateway used ...

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Feb 1, 2000 ... value, sequentially from the route hub (RH1) to route hub. RH4) and ... other route hub (RH6) assigns the address to itself based on. G06F 15/ ...
US006728245B1

(12) United States Patent

(10) Patent N0.: (45) Date of Patent:

Nakatsugawa (54)

COMMUNICATION METHOD, COMMUNICATION SYSTEM, AND GATEWAY USED FOR THE COMMUNICATION SYSTEM

EP EP JP JP

0 887 980 A2 0 903 893 A2 59-62245 10294751

JP

11-17718

US 6,728,245 B1 Apr. 27, 2004 12/1998 3/1999 4/ 1984 11/1998 1/1999

(75) Inventor: Yoshinori Nakatsugawa, ShiZuoka-ken JP

( ) (73) Assignee: Yazaki Corporation, Tokyo (JP)

Primary Examiner—Alpus H. Hsu (74) Attorney) Agent) 0" Fi"m—Finnegan, Henderson, FaraboW, Garrett & Dunner, L.L.P.

(*)

Notice:

Subject to any disclaimer, the term of this patent is extended or adjusted under 35

(57)

U'S'C' 154(k)) by 0 days‘

When data is exchanged betWeen a pair of LANs (3, 5) via

ABSTRACT

a pair of route hubs (RH4, RH6), one of the route hubs

(21) Appl' NO‘: 09/495’458 (22)

Filed:

Feb 1, 2000 _

(30)

_

in a clockwise direction, assigns an address to each route

_

_

_

hub (RH) and each node terminal (N), based on an address

Forelgn Apphcatlon Prlorlty Data

F b. 10 1999

e (51)

(RH4) sends an address assignment frame to a ?rst LAN (3)

JP

value, sequentially from the route hub (RH1) to route hub RH4) ’ and sends the address assignment frame ’ Which has (

......................................... .. 11-033311

(52)

’ ( ) Int. Cl.7 ....................... .. H04L 12/28; H04L 12/66; G06F 15/16 US. Cl. ..................... .. 370/392; 370/401; 709/238;

been returned, to the other route hub (RH6) of the pair. The other route hub (RH6) assigns the address to itself based on the address value contained in the received address assign ment frame, sends the address assignment frame to a second

709/245; 709/249

LAN (5) in the clockwise direction, assigns the address to

(58)

Field of Search ............................... .. 370/229, 230,

each route hub (RH) and each node terminal (N), based on

370/231, 235, 254, 351, 389, 392, 401, 402, 403, 404, 405; 709/238, 245, 246,

the address value, sequentially from the route hub (RH7), and returns the address assignment frame, Which has been

249

returned, to the route hub (RH4). Thus, addresses are

(56)

automatically assigned to each route hub (RH) and node terminal Upon receiving communication data to be sent to a destination, each of the pair of route hubs (RH4, RH6)

References Cited U'S' PATENT DOCUMENTS 2/1995 Oprescu ................... .. 395/800

selects a route via Which the communication data is to be Sent, and for Sending the Communication data to the desti nation via the selected route.

5,394,556 A

FOREIGN PATENT DOCUMENTS

EP

0 436 932

7/1991

11 Claims, 10 Drawing Sheets

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Apr. 27, 2004

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