Troubleshooting chart
The following table lists symptoms, possible causes, and possible solutions for problems
that might occur.
Table 9. Troubleshooting chart
Possible Solution
Possible Cause
Symptom
• Check the power cable connections at the
switch and the power source.
• Make sure that all cables are used
correctly and comply with the Ethernet
specifications.
Power is not supplied to
the switch.
The Power LED is off.
• Check the crimp on the connectors and
make sure that the plug is properly
inserted and locked into the port at both
the switch and the connecting device.
• Make sure that all cables are used
correctly and comply with the Ethernet
specifications.
• Check for a defective port, cable, or
module by testing them in an alternate
environment where all products are
functioning.
The port connection is not
working.
The left and right port LEDs for a port
are off although the port is connected
to a powered-on device.
Break the loop by making sure that only one
path exists from any networked device to
any other networked device. After you
connect to the switch device UI, you can
configure the Spanning Tree Protocol (STP)
to prevent network loops.
One possible cause is that
a network loop (redundant
path) was created and that
a broadcast storm
occurred.
A file transfer is slow or performance
is degraded.
• Verify that the cabling is correct.
• Make sure that all connectors are securely
positioned in the required ports. It is
possible that equipment was accidentally
disconnected.
One or more devices are
not properly connected, or
cabling does not meet
Ethernet guidelines.
A segment or device is not recognized
as part of the network.
Break the loop by making sure that only one
path exists from any networked device to
any other networked device. After you
connect to the switch device UI, you can
configure the Spanning Tree Protocol (STP)
to prevent network loops.
A network loop (redundant
path) was created.
The left and right port LEDs for all
connected ports are blinking
continuously and the network is
disabled.
Hardware Installation Guide
36
Troubleshooting
8-Port Multi-Gigabit/10G Ethernet (Ultra60 PoE++) Smart Managed Pro Switch with 2 SFP+ Ports