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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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(Optional) Configuring Association Between ERPS and Ethernet CFM

(Optional) Configuring Association Between ERPS and Ethernet CFM


Association between Ethernet Connectivity Fault Management (CFM) and Ethernet Ring Protection Switching (ERPS) on a port added to an ERPS ring accelerates fault detection, implements fast convergence, and shortens traffic interruptions.

Before configuring association between ERPS and Ethernet CFM, configure basic CFM functions on the port added to the ERPS ring. For details, see Configuring Basic Ethernet CFM Functions in "CFM Configuration" in the S7700 and S9700 V200R011C10 Configuration Guide - Reliability.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run erps ring ring-id track cfm md md-name ma ma-name mep mep-id remote-mep rmep-id

    ERPS is associated with Ethernet CFM to fast detect link failures.

    The association between ERPS and CFM takes effect only when the interface has ERPS associated with CFM and has an interface-based MEP created using the mep mep-id command.

Follow-up Procedure

After ERPS is associated with Ethernet CFM, ensure that the maintenance entity group level (MEL) value of Ring Auto Protection Switching (RAPS) Protocol Data Units (PDUs) in ERPS rings is larger than the MEL value in CFM protocol packets. Otherwise, Ethernet CFM cannot allow RAPS PDUs to pass through. The MEL value can be used for interworking with other vendors' devices in an ERPS ring. The same MEL value ensures smooth communication between devices.

You can run the raps-mel level-id command in the ERPS ring view to set the MEL value in RAPS PDUs.

By default, the MEL in RAPS PDUs is 7.

Updated: 2019-10-18

Document ID: EDOC1000178310

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