Remote Failure Notification via BFD Mediator
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Solution Overview
Problem
Conventional systems cannot deploy Fast Reroute techniques when a node does not support fast failure notification, which hinders the ability to quickly reroute traffic and maintain user experience during network failures.
Innovation Solution
A method and system that enable a local node with fast failure detection to remotely notify a neighbor node of failures using a failure monitoring session, such as Bidirectional Forwarding Detection (BFD) protocol, allowing the remote node to reroute traffic even if it lacks fast failure detection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Fast Reroute techniques are deployed, then traffic rerouting speed is improved, but node compatibility deteriorates because nodes without fast failure notification support cannot utilize these techniques
Solution Approach 1:
The patent introduces an intermediary failure notification mechanism where a first node (with fast failure detection) acts as a mediator to notify a second node (without fast failure detection) about link failures. This intermediary approach allows the second node to participate in Fast Reroute without implementing its own fast failure detection, thus improving compatibility while maintaining fast rerouting capability.
2Loss of time
If fast failure detection is implemented at all nodes, then failure notification speed is improved, but device complexity increases
Solution Approach 1:
The patent makes the first node serve multiple functions: it performs its own fast failure detection, detects failures on links connected to the second node, and notifies both itself and the second node about failures. This multi-functionality allows a single node to provide fast failure notification services to the entire network segment, eliminating the need for complex configurations at every node while maintaining fast failure notification.
Data Source
AI summary
A method and system for failure notification at a remote node in communication with a local node are disclosed. The local node is configured for faster failure detection than the remote node. In one embodiment, the method includes establishing a failure monitoring session between the local node and the remote node, receiving at the remote node, a failure notification from the local node, the failure notification sent using a protocol of the failure monitoring session, and rerouting traffic at the remote node in response to the failure notification.