24-Port Layer 3 Switch Management Guide

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A PPENDIX A
T ROUBLESHOOTING
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.