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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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DLDP Working Modes

DLDP Working Modes

DLDP has two working modes: normal mode or enhanced mode. These modes can be selected when a neighbor entry expires, or when a unidirectional link is detected..

DLDP Working Mode

When a Neighbor Entry Expires

Unidirectional Link Detection

Normal

DLDP does not automatically probe a neighbor before aging out a neighbor entry. When the entry aging timer times out, DLDP ages out the neighbor entry.

DLDP can identify only unidirectional links caused by intersected fibers.

Enhanced

DLDP automatically probes a neighbor before aging out a neighbor entry. When the entry aging timer times out, DLDP starts the enhanced timer and echo timer. When the echo timer times out, the local link status is set to unidirectional and the neighbor entry is deleted.

DLDP can identify unidirectional links caused by intersected fibers or fiber disconnection.

NOTE:

To detect unidirectional links caused by disconnection of one optical fiber, manually set the rate and full duplex mode of the connected interfaces. If you do not set the rate and full duplex mode of the connected interfaces, DLDP does not take effect even if it is enabled.

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Updated: 2019-10-18

N. documento: EDOC1000178318

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