Patent ID: 7787364

Claim:
A control method for controlling establishment of a standby channel route for an active channel route in a network made up of a plurality of transmission apparatuses including an ingress transmission apparatus, an egress transmission apparatus, at least one active channel route transmission apparatus, and at least one standby channel route transmission apparatus, wherein the standby channel route is formed by the standby channel route transmission apparatus, the ingress transmission apparatus, and the egress transmission apparatus, the control method comprising: transmitting from the ingress transmission apparatus to the active channel route transmission apparatus an active channel path establishing message including reserve information for directing the active channel route transmission apparatus to reserve an active channel path of the active channel route; setting the active channel path to an in-use status within a band management table of the ingress transmission apparatus when the ingress transmission apparatus receives a reserve message generated by the egress transmission apparatus in response to the active channel path establishing message; transmitting from the ingress transmission apparatus to the standby channel route transmission apparatus a standby channel path establishing message including pre-reserve information for directing the standby channel route transmission apparatus to pre-reserve a standby channel path of the standby channel route; and setting the standby channel path to a pre-reserved status within a band management table of the standby channel route transmission apparatus when the standby channel route transmission apparatus receives the standby channel path establishing message; wherein the standby channel path that is set to the pre-reserved status within the band management table of the standby channel route transmission apparatus is externally recognized as being in a free status by the transmission apparatuses other than the standby channel route transmission apparatus, wherein, when a band used by the standby channel path of the standby channel route is determined to be used by another active channel path of another active channel route of another network including the standby channel route transmission apparatus, another ingress transmission apparatus, and another egress transmission apparatus, the pre-reserved status of the standby channel path within the band management table of the standby channel route transmission apparatus is canceled, and route calculation is executed to obtain a new standby channel route.