Reverse Notification Tree for Data Networks
AssigneeTellabs Operations, Inc.
InventorsKenneth R. Owens, Srinivas V. Makam, Changcheng Huang, Vishal Sharma
Life of this patent
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Abstract
Recovery time upon the failure of a link or switching system in an asynchronous data network can be minimized if downstream data switches provide upstream messages indicating to upstream switching system that the downstream traffic arrived in tact and was properly handled. Upon this loss or failure of the upstream status message to an upstream switching system, an upstream switching system can reroute data traffic around a failed link or failed switch with a minimal amount of lost data. The upstream status message is conveyed from a downstream switching system to an upstream switching system via a reverse notification tree data pathway.
Claims20
A method for routing a message in a network between a first data switch and a second data switch, comprising:
- establishing a downstream working path for data traffic, the downstream working path including the first and second data switches;
- establishing an upstream reverse notification path associated with the downstream working path for signal traffic from a destination switch in the downstream working path to a protection switch in the downstream working path, wherein the first and second data switches are either between or the same as either the destination or protection switches in the downstream working path;
- routing the message from the second data switch to the first data switch via the upstream reverse notification path, the message providing a fault status indication for the downstream working path.
A reverse notification network in a multi-protocol label switching (MPLS) network, comprising:
- a downstream switching system operable to receive downstream data along a working path;
- an upstream switching system operable to provide the downstream data to the downstream switching system over the working path;
- an upstream data link operable to couple the downstream switching system to the upstream switching system, the upstream data link being part of an upstream reverse notification path established by and from a destination switching system to at least a protection switching system in the working path, the upstream data link operable to send an upstream reverse notification message from the downstream switching system to the upstream switching system, the upstream reverse notification message providing a fault status for the working path, wherein the upstream switching system is either between the destination and protection switching systems in the working path or is the same as the protection switching system in the working path, wherein the downstream switching system is either between the destination and protection switching systems in the working path or is the same as the destination switching system in the working path.
A system for routing a message in a network between a first data switch and a second data switch, comprising:
- means for establishing a downstream working path for data traffic, the downstream working path including the first and second data switches;
- means for establishing an upstream reverse notification path associated with the downstream working path for signal traffic from a destination switch in the downstream working path to a protection switch in the downstream working path, wherein the first and second data switches are either between or the same as either the destination or protection switches in the downstream working path;
- means for routing the message from the second data switch to the first data switch via the upstream reverse notification path, the message providing a fault status indication for the downstream working path.
Dependencies are inferred from the claim text.