No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


Configuration Guide - Reliability

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Licensing Requirements and Limitations for EFM

Licensing Requirements and Limitations for EFM

Involved Network Elements

Other network elements are required to support EFM functions.

Licensing Requirements

EFM is a basic feature of a switch and is not under license control.

Version Requirements

Table 6-7 Products and minimum version supporting EFM


Minimum Version Required







CE12800E (configured with FD-X series cards)


Feature Limitations

  • EFM cannot be configured on logical interfaces.

  • Two OAM entities that are both working in passive mode cannot establish an EFM connection between them.

  • The working mode of EFM can be set on an interface only after EFM has been enabled globally and before EFM is enabled on the interface. The working mode of EFM on an interface cannot be changed after EFM is enabled on the interface. To change the EFM working mode on an interface, first disable EFM on the interface.

  • The timeout interval is set only after EFM has been enabled globally but before EFM is enabled on an interface.

  • OAM entities that initiate a loopback request must work in active mode.

  • The device supports a maximum of 5 enabled devices in passive mode.

  • Only one interface on one device can send EFM packets at one time. In a multi-VS scenario, the system displays a message indicating that another interface is sending EFM packets.

  • After the undo efm enable command is executed in the system view to disable EFM, all the EFM configuration is deleted. If remote loopback is performed on the device and many test packets are sent, running the undo efm enable command may cause test packets to be forwarded. As a result, network bandwidth will be occupied.

Updated: 2019-03-21

Document ID: EDOC1000166606

Views: 126807

Downloads: 90

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Previous Next