Proxy Maintenance Endpoint Consolidates CFM Frames
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Solution Overview
Problem
The increasing deployment of Carrier Ethernet in metropolitan areas leads to scalability issues and increased cost and complexity due to the high overhead of Connectivity Fault Management (CFM) frames in Ethernet-based customer premises equipment, as current standards require Fault Detection, which does not scale well.
Innovation Solution
Implementing proxy maintenance endpoints on provider edge switches to consolidate and transmit CFM frames at a reduced frequency, reducing the number of Ethernet OAM frames traversing the network and eliminating the need for proactive fault detection at customer premises equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Fault Detection is implemented in Metro networks using CFM frames, then connectivity monitoring is improved, but hardware and software complexity of CPE increases
Solution Approach 1:
A proxy MEP is introduced as an intermediary component at the provider edge switch. The proxy MEP receives CFM frames from multiple customer premises equipment devices, consolidates them, and transmits aggregated CFM information upstream. This mediator approach allows the provider edge switch to perform fault detection functions that would otherwise require complex implementations at customer premises equipment, thereby reducing CPE complexity while maintaining connectivity monitoring capabilities.
2Reliability
If CFM frames are transmitted frequently for fault detection, then fault detection capability is improved, but network overhead increases
Solution Approach 1:
The proxy MEP merges and consolidates CFM frames from multiple customer premises equipment devices into a single aggregated CFM frame for transmission upstream through the provider network. This consolidation approach reduces the total number of CFM frames traversing the network while preserving fault detection capability, as the aggregated frame contains information from all connected customer devices.
Solution Approach 2:
The system implements periodic transmission of aggregated CFM frames at optimized intervals. The proxy MEP transmits consolidated CFM information periodically rather than continuously, balancing the need for timely fault detection with the desire to minimize network overhead. This periodic action allows effective fault detection while reducing CFM traffic volume compared to continuous transmission approaches.
3Quantity of substance
If proxy maintenance endpoints are implemented, then CFM traffic is reduced, but provider edge switch complexity increases
Solution Approach 1:
The provider edge switch is designed to perform multiple functions: it acts as a network switch for customer premises equipment, serves as a proxy maintenance endpoint for CFM frame consolidation, and interfaces with the provider network. By making the provider edge switch multi-functional, the solution reduces CFM traffic through consolidation while the complexity increase is concentrated only at the provider edge switch, which is under provider control and can be optimized accordingly.
Data Source
AI summary
A proxy maintenance endpoint is configured within a provider edge switch in a service provider network. Maintenance endpoints within customer premises equipment register with the proxy maintenance endpoint and transmit Connectivity Fault Management (CFM) frames to the proxy maintenance endpoint. The proxy maintenance endpoint encapsulates the CFM frames into a CFM report and transmits the CFM report to remote proxy maintenance endpoints for subsequent distribution to maintenance endpoints within remote customer premises equipment.