G.8032 Optical Bypass Detection for Loop-Free Protection Switching
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Solution Overview
Problem
Existing G.8032 ring protocols do not effectively handle optical bypass relays, leading to prolonged blackholing scenarios and incorrect forwarding information due to undetectable optical bypass events, which can result in loop formation and prolonged outages.
Innovation Solution
The system employs Ethernet Operations, Administration, and Maintenance (OAM) protocols, specifically Continuity Check Messages (CCMs), to detect optical bypass events and adjust forwarding databases, ensuring loop-free topology by installing and removing channel blocks as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical bypass relays are deployed for faster protection switching, then switching speed is improved, but loop formation and topology management issues occur
Solution Approach 1:
The patent implements a feedback mechanism where G.8032 protocol messages are monitored to detect when a span is blocked. This feedback information is used by the optical bypass relay to determine when to restore normal traffic flow, ensuring that the relay only operates when it is safe to do so and preventing loop formation
Solution Approach 2:
The patent introduces an intermediary control mechanism that mediates between the optical bypass relay and the G.8032 ring protocol. This intermediary layer translates and coordinates the operations of both systems, allowing the optical bypass to function while maintaining G.8032's loop-free topology guarantees
2Speed
If optical bypass relays operate independently without protocol integration, then switching speed is improved, but forwarding information accuracy deteriorates
Solution Approach 1:
The patent uses feedback from G.8032 protocol state changes to update the optical bypass relay's forwarding information. When the ring protocol detects topology changes or span failures, this information is fed back to the optical bypass relay, ensuring its forwarding database remains accurate and synchronized with the actual network state
3Reliability
If G.8032 protocol is extended to support optical bypass, then topology management is improved, but protocol complexity increases
Solution Approach 1:
The patent extends the existing G.8032 protocol to serve multiple functions: its original protection switching role plus a new role of managing optical bypass relays. By making the protocol multi-functional and adding features like span blocked detection, the system achieves comprehensive topology management without requiring a completely new protocol
Solution Approach 2:
The patent modifies existing G.8032 protocol parameters and message formats to accommodate optical bypass relay control. By changing and extending existing parameters rather than creating entirely new protocols, the implementation complexity is reduced while maintaining compatibility with existing G.8032 infrastructure
Data Source
AI summary
Systems and methods implemented by a network element in a G.8032 ring include steps of (52) operating an Operations, Administration, and Maintenance (OAM) session with an adjacent network element; and detecting (54) an optical bypass in the G.8032 ring based on the OAM session. The steps can include flushing (56) a forwarding database of the network element based on the optical bypass. The steps can include detecting (58) prior to the optical bypass, that a neighboring node includes a ring block; and subsequent (60) to the optical bypass, installing a new channel block. The optical bypass enables faster protection switching and the present disclosure incorporates an optical bypass in G.8032.