cisco UDLD单向链路检测

Understanding and Configuring the Unidirectional

Link Detection Protocol Feature

Document ID: 10591

Introduction

Prerequisites

Requirements

Components Used

Conventions

Problem Definition

This document explains how the Unidirectional Link Detection (UDLD) protocol can help to prevent

forwarding loops and blackholing of traffic in switched networks.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Problem Definition

moves it to the forwarding state. This creates a forwarding loop or STP loop.

Packets start to cycle indefinitely along the looped path, and consumes more and more bandwidth. This leads

to a possible network outage.