BYPASS RETRIEVAL SYSTEM
Document Type and Number:
Japanese Patent JP3438105
PURPOSE: To improve a restoration rate by allowing a node detecting a fault to send a restoration message and allowing a node other end of a faulty block receiving the message to send the message in an opposite direction and allocating the path for a bypass.
CONSTITUTION: When a node N8 detects a fault via a link L7, the node N8 recognizes all paths having been in operation via the link L7 just before as a faulty path. Destinations to set the bypass such as nodes N7, 2, 6, 10 are set as selected nodes and sends a restoration message with the list added thereto to an adjacent node such as a node N9. Since the node N9 is not designated as the selected nodes, the node N9 transfers singly the restoration message to an adjacent node such as a node N11. Thus, the restoration message is broadcast. Since the node N6 is designated as selected nodes, a registration procedure required by allocating the bypass is processed and an acknowledge message for recite is returned to the reception path.
June 13, 2003
March 18, 1994
H04M3/22; H04L12/56; H04M3/00; H04Q3/00; H04Q3/66; (IPC1-7): H04L12/56