---
title: "Service OAM Overview"
slug: "using-service-oam"
tags: ["OAM", "CFM", "sensor control ", "Assurance Sensor Control"]
updated: 2026-07-07T13:32:50Z
published: 2025-07-31T19:06:50Z
canonical: "docs.crossworkassurance.cisco.com/using-service-oam"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossworkassurance.cisco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Service OAM Overview

The subsequent articles describe the IEEE 802.1ag “Service OAM” function and how to set it up on your Metro Ethernet Network to perform end-to-end monitoring.

Service OAM (or CFM Connectivity Fault Management) encompasses fault management and performance management capabilities of the Cisco® Crosswork Assurance Sensor Control.

**Note**: The Sensor Control’s implementation of Service OAM is primarily focused on reflecting loopback message frames and delay measurements.

**Note**: The [port status](/v1/docs/setting-up-ports) may become yellow under these circumstances:

- EVC-FP (Ethernet Virtual Connection Fault Propagation)
- ETH-CSF (Ethernet Client Signal Failure)
- LLF-FP (Link Loss Forwarding Fault Propagation)

The following figure shows an overview of Service OAM.

#### Overview of Service OAM

![image.png](https://cdn.document360.io/01d1de5e-a375-4fbc-aa82-666ac04c2113/Images/Documentation/image%28407%29.png?sv=2026-02-06&spr=https&st=2026-11-07T18%3A12%3A51Z&se=2026-11-07T19%3A12%3A51Z&sr=c&sp=r&sig=zr%2BrEGq747albrTudk%2Bn%2Fxd35iq6UaCWu5inMW9zk5E%3D)

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