Patent ID: 6501754
Filing Date: 2002-12-31
Classification: H04L,H04Q

Abstract:
An article of manufacture, comprising:a computer usable medium having computer readable program code means embodied therein for causing a computer to function as a node device for label switching entered packets by referring to an input label information capable of identifying a packet flow to be entered and a corresponding information for specifying at least an output side interface, the computer readable program code means includes: first computer readable program code means for causing said computer to store a flow ID capable of network globally identifying a packet flow and an ingress node information regarding an ingress node of a label switched path, according to one label allocation message requesting a setup of the label switched path which is received from one previous hop node; and second computer readable program code means for causing said computer to judge whether a label switched path loop is formed or not according to from which node another label allocation message that contains an identical flow ID and an identical ingress node information as said one label allocation message is received.