Micro-OAM Link Group Monitoring via Non-IP Encapsulation
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Solution Overview
Problem
Current link status monitoring in high-speed data networks is limited by the need for IP-awareness, which is incompatible with non-IP networks, and existing methods like LACP and IP-BFD offer insufficient time resolution and compatibility across different IP environments.
Innovation Solution
Implementing micro-OAM systems at a non-IP layer, such as the data-link layer, using EtherType-based or GAL/ACH encapsulation for micro-OAM sessions, allowing for compatibility across IP environments and enabling rapid status monitoring of individual links within a link group, including the use of failure detection systems like BFD, MPLS-LMDM, and TWAMP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IP-based monitoring methods (LACP, IP-BFD) are used, then monitoring functionality is provided, but compatibility with non-IP networks is lost and time resolution is insufficient
Solution Approach 1:
The patent introduces an intermediary encapsulation mechanism (GAL/ACH header structure) that mediates between the monitoring functionality and the underlying transport layer. This intermediary layer allows OAM packets to be transported over both IP and non-IP networks by providing a universal encapsulation format that abstracts the underlying protocol differences, thereby achieving broad compatibility while maintaining fine-grained monitoring capabilities through the micro-OAM session establishment between individual link members.
2Device complexity
If macro-OAM monitoring of the entire link group is used, then simplified monitoring is achieved, but individual link status identification capability is lost
Solution Approach 1:
The patent applies segmentation by dividing the link group monitoring into two hierarchical levels: macro-OAM for the aggregate link group and micro-OAM for individual link members. Each link member within the link group can establish its own micro-OAM session, enabling independent monitoring of individual links while still benefiting from the simplified macro-OAM interface. This segmentation allows precise identification of which specific link within the group has failed or degraded, providing both simplicity and precision.
3Measurement precision
If micro-OAM sessions are established for each individual link member, then precise link status monitoring is achieved, but system complexity increases
Solution Approach 1:
The patent implements universality through the GAL/ACH encapsulation mechanism that provides a unified transport interface for all micro-OAM sessions. The same encapsulation format and session establishment procedure can be used across all link members regardless of the underlying network type (IP or non-IP). This universal approach allows the system to manage multiple micro-OAM sessions with a consistent methodology, reducing the operational complexity despite the increased number of sessions required for precise individual link monitoring.
Data Source
AI summary
Networks devices interconnected via link groups may implement micro operations administration and maintenance (micro-OAM) sessions. The micro-OAM sessions may be used to monitor the status of individual links within the link groups at small time scales. The micro-OAM session may be implemented on a non-internet protocol (non-IP) layer. In some cases, independent micro-OAM sessions may be used to monitor different links within a link group.