G.8032 Optical Bypass Detection via OAM Protocol
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Solution Overview
Problem
G.8032 ring protocols struggle to maintain loop-free topology and redundancy in the presence of optical bypass relays, leading to prolonged blackholing scenarios due to undetectable optical bypass events, which are invisible to standard G.8032 ring nodes and result in incorrect forwarding information.
Innovation Solution
The proposed solution extends the G.8032 protocol to support rapid detection of optical nodal bypass events through Ethernet layer Operations, Administration, and Maintenance (OAM) protocol sessions, specifically using Continuity Check Messages (CCMs) and Remote Maintenance End Point (MEP) discovery to identify changes in the ring topology and flush or install channel blocks as necessary, ensuring loop-free connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical bypass relays are deployed to provide faster protection switching at the optical layer, then service restoration speed is improved, but the ability to maintain loop-free topology and detect bypass events deteriorates because optical bypass events are invisible to standard G.8032 ring nodes
Solution Approach 1:
The patent introduces Ethernet OAM protocol sessions as an intermediary mechanism between the optical bypass relay and G.8032 ring nodes. The OAM protocol acts as a mediator that makes the invisible optical layer events visible to the Ethernet layer, allowing continuous monitoring and detection of bypass events while maintaining the benefits of optical-level fast protection switching
Solution Approach 2:
The patent implements feedback mechanisms through OAM protocol sessions that continuously monitor ring topology and provide real-time information about bypass events. This feedback enables ring nodes to detect when optical bypass relays are active and adjust their forwarding behavior accordingly to maintain loop-free topology
2Device complexity
If G.8032 ring nodes use standard protocol operations without OAM extensions, then device complexity is reduced, but the ability to detect optical bypass events and restore service rapidly deteriorates
Solution Approach 1:
The patent leverages the existing Ethernet OAM protocol framework, which is a universal standard already widely deployed in Ethernet networks. By extending G.8032 to utilize this existing multi-functional OAM infrastructure, the patent avoids creating entirely new proprietary protocols while enabling rapid detection of optical bypass events through established mechanisms like Continuity Check Messages and Remote MEP discovery
3Speed
If optical bypass relays are used to connect ring ports during node failures, then protection switching speed is improved, but the risk of creating network loops increases because bypass events are undetectable
Solution Approach 1:
The patent implements feedback through OAM protocol sessions that continuously monitor ring topology and provide real-time information about bypass events. This feedback enables ring nodes to detect when optical bypass relays are active and adjust their forwarding behavior accordingly to maintain loop-free topology
Solution Approach 2:
The OAM protocol acts as an intermediary that bridges the visibility gap between optical bypass relays and G.8032 ring nodes, allowing the system to maintain both fast protection switching and loop detection capabilities
Data Source
AI summary
Systems and methods implemented by a network element in a G.8032 ring include steps of operating an Operations, Administration, and Maintenance (OAM) session with an adjacent network element; and detecting an optical bypass in the G.8032 ring based on the OAM session. The steps can include flushing a forwarding database of the network element based on the optical bypass. The steps can include detecting prior to the optical bypass, that a neighboring node includes a ring block; and subsequent 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.