| 摘要 |
<p>PROBLEM TO BE SOLVED: To dispense with the designation of a detour route from the beginning and to dispense with the securement of resources for the detour route by designating a maintenance person's detour route. SOLUTION: If a transfer source router 1 or a relay router 2 detects an intransferrable state from a route through which a packet with a label attached is transmitted when the transfer source router 1 or the relay router 2 transmits the packet, a detour route that can transfer the packet to a transfer destination router 3 is found out, a label for a detour is attached to the packet, and the packet is transmitted to the route shown by the label for a detour. If a relay router 4 for a detour receives the packet with the label for a detour attached from the transfer source router 1 or the relay router 2, the relay router 4 for a detour finds out a detour route that can transfer the packet to the transfer destination router 3, attaches to the packet a new label for a detour showing the detour route, and transfers the packet with the new label attached to the route shown by the new label for a detour.</p> |
