Patent ID: 8509083

Claim:
A band management apparatus for a ring network including a plurality of nodes, comprising: a storage to store first information including, for each VLAN ID (Virtual LAN IDentifier), a first node ID, which indicates a first node that transmits a packet with a VLAN ID from outside of the ring network to a receiving side node, a second node ID, which indicates a receiving side node that transmits the packet from the first node to outside of the ring network, a transmission band amount for the VLAN ID and a category of the band, and second information including a band amount for each of all spans between neighboring nodes of the ring network stored by a communication band calculator; and a communication band calculator that calculates the band amount for each of all spans between neighboring nodes of the ring network, based on the first information and stores the result to the storage as the second information, wherein, the category includes a guaranteed band and a best effort band.