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US 7,095,712 B2Granted
Method and apparatus for protection path setup
AssigneeFujitsu Limited
InventorsHiroshi Kinoshita, Ayako Hashimoto, Takashi Hatano, Satsuki Norimatsu
Life of this patent
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Abstract
When setting up a working path, a protection path is automatically set up by taking each node on the working path as a start point. A working path setup request message carrying “protection needed/not-needed” information is transmitted from an ingress node toward an egress node along the route of the working path. When transferring a path setup response message as a response to it, each node autonomously determines the route of the protection path and sends out a protection path setup request message along the route of the protection path.
Claims22
A protection path setup method comprising the steps of:
- (a) setting up a working path from a start-point node to an end-point node;
- and
- (b) setting up a plurality of protection paths by taking a plurality of nodes on said working path as respective start points at the time of setting up said working path, wherein
- step (a) includes the substeps of:
- transferring a working path setup request message containing therein a protection path request from a start point to an end point of said working path along a route of said working path being set up;
- and
- setting up said working path by transferring a working path setup response message from the end point to the start point of said working path in response to said working path setup request message, and
- step (b) includes the substeps of:
- transferring a protection path setup request message from a start point to an end point of each of said plurality of protection paths in response to said protection path request contained in said working path setup request message;
- and
- setting up each of said plurality of protection paths by transferring a protection path setup response message from the end point to the start point of said each protection path in response to said protection path setup request message.
8 more elements
A node apparatus comprising:
- means for setting up a working path with its own node as a start point;
- and
- means for setting up a protection path with its own node as a start point during the setting up of said working path, wherein
- said working path setup means includes:
- means far sending out a working path setup request message containing therein a protection path request for delivery to an end point of said working path alone the route of said working path being set up;
- and
- means for sending up said working path by receiving a working path setup response messaee returned in response to said working path setup request message;
- and
- said protection path setup means includes:
- means for sending out a protection path setup request message;
- and
- means for setting up said protection path by receiving a protection path setup response message returned in response to said protection path setup request message.
9 more elements
A node apparatus comprising:
- means for setting up a working path passing through its own node;
- and
- means for setting up a protection path with its own node as a start point during the setting up of said working path, wherein
- said working path setup means includes:
- means for transferring a working path setup reauest message containing therein a protection path reguest and being forwarded from a start point toward an end point of said working path along the route of said working path being set up;
- and
- means for setting up said working path by transferring a working path setup response message being returned from the end point toward the start point of said working path in response to said working path setup request message, and
- said potection path setup means includes:
- means for sending out a protection path setup request message in response to said protection path request contained in said working path setup request message;
- and
- means for setting up said protection path by receiving a protection path setup response message returned in response to said protection path setup request message.
8 more elements
A node apparatus comprising:
- means for setting up a working path with its own node as an end point;
- and
- means for setting up a protection path with its own node as an end point during the setting up of said working path, wherein
- said working path setup means includes:
- means for receiving working path setup request message containing therein a protection path request and transmitted from a start point of said working path alone the route of said working path being set up;
- and
- means for setting up said working path by transmitting a working path setup response message toward the start point of said working path in response to said working path setup request message, and
- said protection path setup means includes:
- means for receiving a protection path setup request message transmitted from a start point of said protection path in response to the protection path request contained in said working path setup request message;
- and
- means for setting up said protection path by transmitting a protection path setup response message toward the start point of said protection path in response to said protection path setup request message.
8 more elements
Dependencies are inferred from the claim text.