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Chapter 4
Troubleshooting
Autonegotiation and Network Interface Cards
Problems sometimes occur between the switch and third-party network interface cards (NICs). By
default, the switch ports and interfaces autonegotiate.Laptops or other devices are commonly set to
autonegotiate, yet sometimes issues occur.
To troubleshoot autonegotiation problems, try manually setting both sides of the connection. If this does
not solve the problem, there could be a problem with the firmware or software on the NIC. You can
resolve this by upgrading the NIC driver to the latest version.
Cabling Distance
If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance
from the switch to the connected device meets the recommended guidelines. See the
Specifications" section on page
Resetting the Switch to the Factory Default Settings
If you have configured a new switch with a wrong IP address, or if all of the switch LEDs start blinking
when you try to enter Express Setup mode, you can clear the IP address that is configured on the switch.
Note
Resetting the switch deletes the configuration and reboots the switch.
To reset the switch:
1.
2.
The switch now behaves like an unconfigured switch. You can configure the switch by using Express
Setup as described in the switch getting started guide on Cisco.com.
You can also configure the switch by using the CLI setup procedure. See
Switch with the CLI-Based Setup Program."
OL-19593-02
Press and hold the Mode button
The switch LEDs begin blinking after about 2 seconds. If the LEDs above the mode button turn solid
green, you can release the Mode button and run Express Setup to configure the switch. If the LEDs
do not turn solid green, continue with the next step.
Continue holding down the Mode button. The LEDs stop blinking after an additional 8 seconds, and
then the switch reboots.
B-5.
(Figure 1-2 on page
1-4).
Catalyst 3750-X and 3560-X Switch Hardware Installation Guide
Resetting the Switch to the Factory Default Settings
"Cable and Adapter
Appendix C, "Configuring the
4-5
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