Network system

• US 9,531,567 B2
• Filed: 07/03/2012
• Issued: 12/27/2016
• Est. Priority Date: 07/03/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Shigeeda, Tetsuya, Honda, Shingo
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): LOPATA, ROBERT J
• Application Number:
  US14/408,313
• Publication Number:
  US 20150195103A1
• Time in Patent Office: 1,638 Days
• Field of Search: 370/392
• US Class Current: 1/1
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04L 12/465 wherein a single frame includes a plurality of VLAN tags
• CPC Class Codes: H04L 12/4675 Dynamic sharing of VLAN information amongst network nodes configuration of the network or of network elements H04L41/08
• CPC Class Codes: H04L 45/245 Link aggregation, e.g. trunking
• CPC Class Codes: H04L 49/70 Virtual switches

Abstract

A communication apparatus for performing communication among cars of a train includes two or more connection ports, and two or more VLANs set through VLAN numbers in each connection port. When receiving a specific kind of packet for disabling the VLAN settings, the communication apparatus regards the set two or more VLANs as the same network with respect to the specific kind of packet and transfers the packet to a desired destination apparatus set in any one of the VLANs irrespective of the VLAN settings.

Claims

1. A network system comprising two or more communication apparatuses, the communication apparatuses being connected by a trunk link,

each of the communication apparatuses for performing communication among cars of a train, including:

two or more connection ports; and

two or more VLANs set through VLAN numbers in each connection port,

wherein each of the communication apparatuses determines, on the basis of only information for identifying a kind of communication given to a packet, whether a received packet is a specific kind of packet for disabling the VLAN settings, and, when receiving the specific kind of packet, each of the communication apparatuses disables the VLAN settings of each connection port with respect to the specific kind of packet, regards the set two or more VLANs as a same network, and transfers the packet to a desired destination apparatus.

2. A network system comprising two or more communication apparatuses, the communication apparatuses being connected by a trunk link,

each of the communication apparatuses for performing communication among cars of a train, including:

two or more connection ports; and

two or more VLANs set through VLAN numbers in each connection port,

wherein each of the communication apparatuses determines, on the basis of only information for identifying a kind of communication given to a packet, whether a received packet is a specific kind of packet for disabling the VLAN settings, and, when receiving the specific kind of packet, each of the communication apparatuses disables the VLAN settings of each connection port with respect to the specific kind of packet, regards the set two or more VLANs as a same network, and transfers the packet to a desired destination control apparatus for controlling apparatuses in the VLANs.