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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

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.
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Unidirectional Link Processing

Unidirectional Link Processing

When a unidirectional link is detected, DLDP shuts down the corresponding interface in either of the following ways:

  • Manual mode: DLDP detects the unidirectional link, and the network administrator shuts down the interface manually. Upon detecting a unidirectional link, the local device only records logs and traps and prompts the network administrator to shut down the interface.

  • Automatic mode: DLDP detects the unidirectional link, records logs and traps, and sets the interface state to DLDP Down. A DLDP Down interface receives and forwards only BPDUs, not user traffic.


The automatic mode is recommended on networks with high performance. When the network performance is poor, there may be a delay in receiving DLDP packets, causing DLDP to mistakenly identify a unidirectional link. In this scenario, the manual mode is recommended. The network administrator manually shuts down the interface, preventing packet forwarding from being affected.

Updated: 2019-04-03

Document ID: EDOC1100075366

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