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Configuration Guide - Reliability

S7700 and S9700 V200R011C10

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.
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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.

NOTE:

The automatic mode is recommended on networks with high performance. When the network performance is poor, there may be a delay in receiving DLDPDUs, 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.

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Updated: 2019-10-18

N. documento: EDOC1000178318

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