Dldp Introduction - H3C S5500-EI Series Operation Manual

Dldp configuration

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Operation Manual – DLDP

H3C S5500-EI Series Ethernet Switches

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Figure 1-1 Unidirectional fiber link: cross-connected fiber

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Figure 1-2 Unidirectional fiber link: fiber not connected or disconnected

1.1.1 DLDP Introduction

Device Link Detection Protocol (DLDP) can detect the link status of a fiber cable or

twisted pair. On detecting a unidirectional link, DLDP can shut down the related port

automatically or prompt users to take measures as configured to avoid network

problems.

As a data link layer protocol, DLDP cooperates with physical layer protocols to monitor

the link status of a device. The auto-negotiation mechanism provided by physical layer

protocols detects physical signals and faults. DLDP, however, performs operations

such as identifying peer devices, detecting unidirectional links, and shutting down

unreachable ports. The cooperation of physical layer protocols and DLDP ensures that

physical/logical unidirectional links be detected and shut down. For a link with the

devices on the both sides of it operating properly, DLDP checks to see if the cable is

Device A

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Device B

Device A

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Device B

1-2

Chapter 1 DLDP Configuration

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