HP J4903A User Manual - Page 55

Troubleshooting, Basic Troubleshooting Tips

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4 Troubleshooting This chapter describes how to troubleshoot the Switch 2800 Series devices. This document describes troubleshooting mostly from a hardware perspective. You can perform more in-depth troubleshooting on the Switch 2800 Series devices using the software tools available with the switch, including the fullfeatured console interface, the built-in web browser interface. For more information, see the chapter "Troubleshooting" in the Management and Configuration Guide, which is on the Documentation CD-ROM that came with your switch. This chapter describes the following: ■ basic troubleshooting tips (page 4-1) ■ diagnosing with the LEDs (page 4-4) ■ Proactive Networking tools (page 4-8) ■ hardware diagnostic tests (page 4-9) ■ restoring the factory default configuration (page 4-11) ■ downloading new software to the Switch 2800 Series devices (page 4-12) ■ HP Customer Support Services (page 4-12) Basic Troubleshooting Tips Most problems are caused by the following situations. Check for these items first when starting your troubleshooting: ■ Connecting to devices that have a fixed full-duplex configuration. The RJ-45 ports are configured as "Auto". 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 configured to Auto, the switch will automatically negotiate both link speed and communication mode. • If the connected device has a fixed configuration, for example 100 Mbps, at half or full duplex, the switch will automatically sense the link speed, but will default to a communication mode of half duplex. 4-1 Troubleshooting

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4-1
Troubleshooting
4
Troubleshooting
This chapter describes how to troubleshoot the Switch 2800 Series devices.
This document describes troubleshooting mostly from a hardware perspec-
tive. You can perform more in-depth troubleshooting on the Switch 2800 Series
devices using the software tools available with the switch, including the full-
featured console interface, the built-in web browser interface. For more
information, see the chapter “Troubleshooting” in the
Management and
Configuration Guide,
which is on the Documentation CD-ROM that came
with your switch.
This chapter describes the following:
■
basic troubleshooting tips (
page 4-1
)
■
diagnosing with the LEDs (
page 4-4
)
■
Proactive Networking tools (
page 4-8
)
■
hardware diagnostic tests (
page 4-9
)
■
restoring the factory default configuration (
page 4-11
)
■
downloading new software to the Switch 2800 Series devices (
page 4-12
)
■
HP Customer Support Services (
page 4-12
)
Basic Troubleshooting Tips
Most problems are caused by the following situations. Check for these items
first when starting your troubleshooting:
■
Connecting to devices that have a fixed full-duplex configuration.
The RJ-45 ports are configured as “Auto”. 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 configured to Auto, the switch will
automatically negotiate both link speed and communication mode.
•
If the connected device has a fixed configuration, for example
100 Mbps,
at half or full duplex, the switch will automatically sense
the link speed, but will default to a communication mode of
half
duplex.