Patent ID: 7133358
Filing Date: 2006-11-07
Classification: H04J,H04Q

Abstract:
1. A failure control unit with failure recovery functions, comprising: label table management means for managing a label table which associates incoming labels related to incoming transmission data with outgoing labels related to outgoing transmission data; transmission means for controlling label-switched routing of the incoming transmission data, based on the label table; path set-up means for establishing a loop-shaped protection path that includes a part or whole of transmission links of an existing working path and would allow transmission data to flow in the opposite direction to that of the working path; and failure recovery means for executing a failure recovery process when a failure occurs on the working path, by changing the association between the incoming and outgoing labels stored in the label table, so as to switch the failed part of the working path to the loop-shaped protection path, wherein the path set-up means establishes the loop-shaped protection path by selecting one particular node on the working path and then drawing a closed-loop path that starts from the selected node and returns to the same selected node.