Patent ID: 9590815
Date: 2017-03-07
CPC Classifications: H04L

Claim:
1. A relay system comprising: a first redundancy device made up of a first switching device and a second switching device; and a second redundancy device made up of a third switching device and a fourth switching device and connected to the first redundancy device, wherein the first switching device and the second switching device each have a first port group made up of one or a plurality of first ports, a second port and a bridge port, the first switching device and the second switching device being connected to each other by a communication line via the bridge ports, the third switching device has a first link with the first port group of the first switching device and has no link with the second switching device, the fourth switching device has a second link with the first port group of the second switching device and has no link with the first switching device, and a communication between the first redundancy device and the second redundancy device is performed through the first link when the first link has no fault, and the communication is performed through the second link when the first link has a fault and the second link has no fault.