| 摘要 |
A bandwidth guaranteed communication system is obtained for securing or reserving a bandwidth dynamically required for a minute unit such as an application on Ethernet. The system is provided with a communication network in which a plurality of devices each terminating a layer 2 are arranged. At the time of bandwidth reservation, a bandwidth reservation request is made through an Ethernet OAM frame from an end point performing the bandwidth reservation by the use of the Ethernet OAM frame specified by the layer 2. It is determined by an intermediary one of the plurality of devices whether the bandwidth reservation can be made. If the bandwidth reservation can be made, the bandwidth reservation is transmitted to a device in a downstream direction, and when it reaches the most distant point, the bandwidth reservation request is returned to a transmitting source, whereby it is recognized that the bandwidth reservation has been completed and the start of user communication is permitted. If the bandwidth reservation can not be made, the bandwidth reservation request is returned to the transmitting source, and the application of user communication in a reply path concerned is not permitted.
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