LSP Failure Notification via Shared Protection Loop
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Solution Overview
Problem
Conventional MPLS TP technologies are inadequate for handling multi-link failures, single node failures, and multi-node failures, as the Wrapping mode protection switching method is not applicable in these scenarios, leading to inefficiencies in packet forwarding and network reliability.
Innovation Solution
The implementation of a method that uses a ring network with a work LSP and a protection LSP loop, where LSRs detect failures and send SF messages to switch packets via a protection LSP loop, allowing multiple work LSPs with different ingress and egress nodes to share a protection LSP loop, and utilizing control layer signaling like MR-PSC protocols for failure notification and restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Wrapping mode protection switching is used, then single link failure can be handled, but multi-link failures, single node failures, and multi-node failures cannot be handled
Solution Approach 1:
The patent makes the protection LSP loop serve multiple functions: it acts as both a protection path for single link failures and a notification path for multi-link/node failures. The same protection LSP loop structure is used universally across all failure scenarios, eliminating the need for separate mechanisms for different failure types.
Solution Approach 2:
The patent introduces control layer signaling (SF messages, MR-PSC protocol) as an intermediary mechanism to handle complex failure scenarios. Instead of relying solely on data plane Wrapping mode, the control layer mediates failure detection, notification, and restoration coordination, enabling handling of multi-link and multi-node failures that exceed pure data plane capabilities.
2Quantity of substance
If multiple work LSPs share a protection LSP loop, then resource utilization improves, but failure notification complexity increases
Solution Approach 1:
The protection LSP loop is designed to be universally shared by multiple work LSPs regardless of their ingress/egress nodes. This universal sharing mechanism allows efficient resource utilization while the control layer signaling provides a unified notification approach that manages the complexity of coordinating multiple LSPs over a shared protection path.
Data Source
AI summary
According to an example, in a method and apparatus for notifying a LSP, the downstream LSR detecting the link failure on the work LSP sends a SF message on the direction of the work LSP, so that the upstream LSR detecting the link failure on the work LSP receives the SF message and sends the packet via the protection LSP according to the SF message.