Troubleshooting; Basic Troubleshooting Tips - HP ProCurve 408 Installation Manual

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Troubleshooting

This chapter describes how to troubleshoot your Switch 408 including

the following:

■

basic troubleshooting tips (page 3-1)

■

diagnosing with the LEDs (page 3-3)

■

hardware diagnostic tests (page 3-5)

■

ProCurve Customer Support Services (page 3-6)

Most problems are caused by the following situations:

Connecting to devices with a fixed full-duplex configura-

■

tion. The Switch 408 ports are set to auto-negotiate the link

characteristics. That is, when connecting to attached devices, the

switch will operate in one of two ways to determine the link speed

and the communication mode (half duplex or full duplex):

•

if the connected device is also set to auto negotiate, the

switch will automatically negotiate both link speed and

communication mode

•

if the connected device has a fixed configuration, for example

(100 Mbps, and half or full duplex), the switch will automat-

ically sense the link speed, but will default to a communica-

tion mode of half duplex

3-1

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