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Finding the Switch Serial Number
• If a remote device does not autonegotiate, use the same duplex settings on the two ports. The speed
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 autonegotiation 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 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.
Finding the Switch Serial Number
If you contact Cisco Technical Assistance, you need to know the switch serial number. You can also use the
show version privileged EXEC command to see the switch serial number.
Figure 57: Serial Number Location
Serial number of the switch is located at the bottom of the switch. Following illustration shows all the labels
at the bottom of the switch.
Catalyst Digital Building Series Switch Hardware Installation Guide
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parameter adjusts itself even if the connected port does not autonegotiate.
Troubleshooting
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