System information

B-1
Appendix B: Troubleshooting
Troubleshooting Chart
Symptom Action
Cannot connect using Telnet,
Web browser, or SNMP
software
• Be sure you have configured the agent with a valid IP address, subnet
mask and default gateway.
• If you are trying to connect to the agent via the IP address for a tagged
VLAN group, your management station must include the appropriate tag
in its transmitted frames.
• Check that you have a valid network connection to the switch and that the
port you are using has not been disabled.
• Check network cabling between the management station and the switch.
• If you cannot connect using Telnet, you may have exceeded the maximum
number of concurrent Telnet sessions permitted. Try connecting again at
a later time.
Cannot access the on-board
configuration program via a
serial port connection
• Be sure you have set the terminal emulator program to VT100 compatible,
8 data bits, 1 stop bit, no parity and 9600 bps.
• Check that the null-modem serial cable conforms to the pin-out
connections provided in Appendix B.
Forgot or lost the password • Reinstall the switch defaults. Make a direct connection to the switch’s
console port and power cycle the switch. Immediately after powering on,
press <Ctrl><u> to access the system file menu. Select <D> to delete all
user-defined configuration files. Press <Q> to boot the switch.