For more information on using these software tools to diagnose and manage your switch, see the
“Troubleshooting” chapter in the Management and Configuration Guide for your switch at https://www.hpe.com/
networking/ResourceFinder.
Hardware diagnostic tests
Testing the switch by resetting it
If you believe the switch is not operating correctly, you can reset the switch to test its circuitry and operating code.
To reset a switch, try any of the following:
• Unplug and plug in the power cord (power cycling).
• Press the Reset button on the front of the switch.
• Reboot the switch via the management console’s boot system command.
Power cycling the switch and pressing the Reset button both cause the switch to perform its power-on self test,
which almost always will resolve any temporary operational problems. These reset processes also cause any
network traffic counters to be reset to zero, and cause the System Up Time timer to reset to zero.
Checking the switch LEDs
See Diagnosing with the LEDs on page 69 for information on interpreting the LED patterns and LED behaviors.
Checking console messages
Useful diagnostic messages may be displayed on the console screen when you reset a switch. Connect a PC
running a VT-100 terminal emulator program or a standard VT-100 terminal to the switch console port. Configure
the terminal to run at 9600 baud, and with the other terminal communication settings shown in Configuring the
management console on page 60.
When you reset the switch, note the messages that are displayed. Additionally, you can check the switch event
log, which can be accessed from the console using the show log command, or from the console main menu.
Testing twisted-pair cabling
Network cables that fail to provide a link or provide an unreliable link between the switch and the connected
network device may not be compatible with the IEEE 802.3 Type 10Base-T, 100Base-TX, or 1000Base-T
standards. The twisted-pair cables attached to the switch must be compatible with the appropriate standards. To
verify your cable is compatible with these standards, use a qualified cable test device.
Testing switch-to-device network communications
The following communication tests can verify that the network is operating correctly between the switch and any
connected device that can respond correctly to the communication test.
• Link Test: A physical layer test that sends IEEE 802.2 test packets to any device identified by its MAC address.
• Ping Test: A network layer test used on IP networks that sends test packets to any device identified by its IP
address.
These tests can be performed through the switch console interface. Use a terminal connected directly to the
switch or through a Telnet connection, or from the switch web browser interface. For more information, see the
Management and Configuration Guide for your switch at http://www.hpe.com/support/manuals.
These tests can also be performed from an SNMP network management station running a program that can
manage the switch. Examples include IMC or AirWave).
Chapter 6 Troubleshooting 79
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