4-4
Catalyst 2350 Switch Hardware Installation Guide
OL18479-01
Chapter 4 Troubleshooting
Clearing the Switch IP Address and Configuration
To maximize switch performance and to ensure a link, follow one of these guidelines when changing the
duplex or speed settings.
•
Let both ports autonegotiate both speed and duplex.
•
Manually set the speed and duplex parameters for the ports on both ends of the connection.
•
If a remote device does not autonegotiate, set the same duplex settings on the two ports. The speed
parameter adjusts itself even if the connected port does not autonegotiate.
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 are set to autonegotiate. Devices like laptops or other devices are
commonly set to autonegotiate, yet sometimes autonegotation 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 your NIC. You can
resolve this by upgrading the NIC driver to the latest available 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 B-4
for cabling guidelines.
Clearing the Switch IP Address and Configuration
If you have configured a new switch with a wrong IP address, or if all of the switch LEDs start blinking
when you are trying to enter Express Setup mode, you can clear the configured IP address. The switch
returns to the factory default settings.
Note
This procedure clears the IP address and all configuration information stored on the switch. Do not
follow this procedure unless you want to completely reconfigure the switch.
1.
Press and hold the Mode button (
2.
The switch LEDs begin blinking after about 2 seconds. If the switch is not configured, the LEDs
above the Mode button turn green. You can omit the next step.
3.
Continue holding down the Mode button. The LEDs stop blinking after an additional 8 seconds, and
then the switch reboots.
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 that is included with the switch.
You can also configure the switch by using the CLI setup procedure described in the
Switch with the CLI-Based Setup Program”
appendix.
