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CLI-based Configuration Guide - Reliability

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.
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Configuring Remote Fault Indication

Configuring Remote Fault Indication

Context

Remote fault indication is used to detect remote device faults and monitor Ethernet performance.

After EFM connections have been established, both EFM entities exchange Information OAMPDUs. When traffic is interrupted because an EFM entity fails or becomes unavailable, the faulty EFM entity will send an Information OAMPDU carrying a critical link event flag to its remote EFM entity, record a log, and send an alarm. This mechanism helps administrators to learn the link status in real time and troubleshoot link faults promptly.

As shown in Figure 8-8, if a fault occurs on PE2, PE2 sends an Information OAMPDU carrying a critical link event flag to the CE. Association between EFM and Port1 is triggered and services are switched to the backup path. This association ensures reliable traffic transmission.

Figure 8-8  Remote fault indication and association between EFM and an interface

Pre-configuration Tasks

Before configuring remote fault indication, complete the following task:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The view of the interface at one end of the link is displayed.

  3. Run efm { critical-event | dying-gasp | link-fault | timeout } trigger error-down

    Association between EFM and the interface is configured. The association will be triggered if a remote fault occurs.

    By default, association between EFM and the interface is not triggered by a remote fault.

    The efm trigger error-down command associates an error event with an interface. When EFM detects critical-event, dying-gasp, link-fault, or timeout faults, the protocol status of the interface becomes Down and all services on the interface are interrupted. Traffic will not be switched back even if the faulty link recovers and the protocol status of the interface does not change. You need to manually check link quality before switching traffic back to the original link.

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Updated: 2019-08-12

Document ID: EDOC1100034076

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