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Catalyst 4500 E-Series Switches Installation Guide
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Chapter 5 Troubleshooting
Troubleshooting Supervisor Engines
NIC Compatibility Issues
You can have NIC compatibility or misconfiguration issues with the switch if you experience one of
these symptoms:
• A server or client connection to the switch does not come up
• Autonegotiation issues
• Errors on the port
The reason for these symptoms can be a known NIC driver issue, speed and duplex mismatch, or
autonegotiation or cabling problems. For more troubleshooting info rmation, refer to:
http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800a7af0.shtm
l
If you still have issues after you review and follow the procedure in the document Troubleshooting Cisco
Catalyst Switches to NIC Compatibility Issues, contact Cisco Technical Support for further assistance.
Interface Is in Errdisable
If the interface status is err-disable in the output of the show interface status command, some possible
reasons include:
• Duplex mismatch
• Port channel misconfiguration
• Bridge protocol data unit (BPDU) guard violation
• UniDirectional Link Detection (UDLD) condition
• Late-collision detection
• Link-flap detection
• Security violation
• Port Aggregation Protocol (PAgP) flap
• Layer Two Tunneling Protocol (L2TP) guard
• DHCP snooping rate-limit
In order to troubleshoot these scenarios, refer to the specific feature information in the Catalyst 4500
Series Switch Cisco IOS Software Configuration Guide for your software release.
Faulty Supervisor Engine
If the supervisor engine STATUS LED is red, establish a console connection to the supervisor engine
and enter the show diagnostics power-on command, if you can. If you are unable to get a console
connection or the command output indicates a failure, contact Cisco Technical Support.
If the switch does not boot and fails self diagnostics during the boot sequence, capture the c onsole output
of the startup sequence then contact Cisco Technical Support.
If you do not see any hardware failure in the boot sequence or in the output of the show diagnostics
power-on command, contact Cisco Technical Support.