Cisco Systems C3850NM210G Manual De Usuario

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.

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 

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.

Resetting the switch reboots the switch.

To reset the switch:

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.

Alternatively, you can press the Reset button on the rear of the switch (approximately 5 seconds) to 
power cycle the switch. 

You can also configure the switch by using the CLI setup procedure. See