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Troubleshooting
Use Table 3-1 to identify problems with the modules and take the appropriate
corrective action.
Table 3-1
Common Problems and Their Solutions
Symptom
Possible Causes
Port LED is
Thumbscrews have not been
amber.
tightened.
Spanning Tree Protocol is
checking for loops.
Port is initializing, it was disabled
by management or an address
violation, or it was blocked by
Spanning Tree Protocol.
Port LED is
Port is experiencing error frames.
alternating
This could be due to a duplex
between green and
mismatch caused by
amber.
autonegotiation, collisions, CRC
errors, or alignment errors.
78-5912-03
Corrective Action
Tighten thumbscrews.
Wait for Spanning Tree Protocol to complete
its search. The LED turns green when
Spanning Tree Protocol completes its check.
Use Visual Switch Manager or the IOS
command-line interface to check the status of
the port and to enable it.
Check the duplex settings on both devices.
Check the speed settings on both devices
except when using a gigabit Ethernet module.
You cannot change the speed on the gigabit
Ethernet modules. If one parameter is
manually set, manually set all of them, or set
both devices to autonegotiate speed and
duplex. See the Catalyst 2900 Series XL
Installation and Configuration Guide for
more information.
Catalyst 2900 Series XL Modules Hardware Installation Guide
C H A P T E R
3
3-1
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