Ethernet OAM to ATM OAM Interworking for Loopback
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Solution Overview
Problem
Service provider networks face challenges in ensuring communication compatibility and end-to-end connectivity fault management between Ethernet and ATM networks during the migration from ATM to Ethernet infrastructure, as existing OAM capabilities are limited to respective network portions.
Innovation Solution
The techniques enable interworking between Ethernet OAM Loopback frames and ATM OAM End-to-End Loopback cells by converting relevant fields from Ethernet frames into ATM cells and vice versa, allowing network operators to perform end-to-end troubleshooting in mixed Ethernet and ATM networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Ethernet OAM capabilities and ATM OAM capabilities are used separately in their respective network portions, then each network portion can maintain its own connectivity, but end-to-end connectivity verification between Ethernet and ATM networks cannot be performed
Solution Approach 1:
The access node serves as an intermediary device that receives Ethernet OAM Loopback frames from the Ethernet network, converts them to ATM OAM Loopback cells, and transmits them through the ATM network to the subscriber device. This intermediary function enables end-to-end connectivity verification across the hybrid network by bridging the protocol gap between Ethernet and ATM OAM capabilities.
2Adaptability or versatility
If the network migrates from ATM infrastructure to Ethernet infrastructure, then the network can benefit from Ethernet advantages, but existing ATM-based access devices and CPE cannot be replaced immediately creating a mixed network environment
Solution Approach 1:
The access node is designed with multi-functionality to handle both Ethernet and ATM protocols simultaneously. It can receive Ethernet OAM frames, convert them to ATM OAM cells, and vice versa, allowing a single device to manage connectivity verification across both network types without requiring separate specialized devices for each protocol.
3Ease of operation
If Ethernet OAM Loopback frames are converted to ATM OAM Loopback cells through the access node, then end-to-end troubleshooting between Ethernet and ATM networks is enabled, but additional conversion functionality and processing are required at the access node
Solution Approach 1:
The access node acts as a protocol translation intermediary, implementing conversion functionality that receives Ethernet OAM Loopback frames, extracts relevant fields, constructs corresponding ATM OAM Loopback cells with appropriate mapping of identifier fields, and transmits them through the ATM network. This centralized conversion approach simplifies the overall system by concentrating the complexity in a single intermediary device rather than requiring complexity at every endpoint.
Data Source
AI summary
In general, techniques are described for interworking between Ethernet organization, administration, and maintenance (OAM) frames and Asynchronous Transfer Mode (ATM) ATM OAM cells. For example, an access node in an Ethernet and ATM network may implement the techniques. The access node comprises an Ethernet interface that receives an Ethernet OAM Loopback frame from a device within an Ethernet network. The access node includes a control unit that constructs an ATM OAM End-to-End Loopback cell from the Ethernet OAM Loopback frame, and an ATM interface that transmits the ATM OAM End-to-End Loopback cell from the access node towards a virtual circuit connected to a subscriber device to verify connectivity from the originating device within the Ethernet network to the subscriber device within the ATM network.