Patent ID: 7983154

Claim:
A method for controlling a physical bandwidth of a ring network including a plurality of node apparatuses, the method comprising: cooperatively using an RPR (Resilient Packet Ring) function of adjusting an amount of frames flowing on a data link layer and an LCAS (Link Capacity Adjustment Scheme) function of adding/deleting a predetermined path on a physical layer by transmitting predetermined control information to the plurality of node apparatuses, wherein the predetermined control information including an LCAS control information for controlling the LCAS function and an RPR control information for controlling the RPR function; confirming the status of a path corresponding to each node apparatus in the ring network by using the predetermined control information; instructing each node apparatus to add/delete the predetermined path on the physical layer while using the RPR function of the data link layer by using the predetermined control information when the status of the path corresponding to each node apparatus is confirmed to be normal; reporting completion of adding/deleting the predetermined path to each node apparatus by using the predetermined control information when the addition/deletion of the predetermined path is adequately performed by each node apparatus; and reporting the addition/deletion of the predetermined path to the RPR function of the data link layer by referring to the RPR function of the data link layer when the completion of the addition/deletion of the predetermined path is adequately reported by each node apparatus.