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Troubleshooting
10/100/1000 PoE+ Port Connections
A powered device connected to a PoE port does not receive power:
• Use the Mode button to show the PoE status for all ports.
• Use the show interfaces privileged EXEC command to see if the port is in error-disabled, disabled, or
shutdown. Reenable the port if necessary.
• Verify that the power supply installed in the switch meets the power requirements of your connected
devices.
• Verify that there is sufficient PoE power budget to provide power to the attached device. Use the show
power inline global configuration command to check on the available PoE power budget.
• Verify the cable type. Many legacy powered devices, including older Cisco IP phones and access points
that do not fully support IEEE 802.3af, might not support PoE when connected to the switch by a
crossover cable. Replace the crossover cable with a straight-through cable.
Caution
SFP Module
Use only Cisco SFP modules in the switch. Each Cisco module has an internal serial EEPROM that is encoded
with security information. This encoding provides a way for Cisco to identify and validate that the module
meets the requirements for the switch.
• Inspect the SFP module. Exchange the suspect module with a known good module. Verify that the
module is supported on this platform. (The switch release notes on Cisco.com list the SFP modules that
the switch supports.)
• Use the show interfaces privileged EXEC command to see if the port or module is error-disabled,
disabled, or shutdown. Reenable the port if needed.
• Make sure that all fiber-optic connections are properly cleaned and securely connected.
Interface Settings
Verify that the interface is not disabled or powered off. If an interface is manually shut down on either side
of the link, it does not come up until you reenable the interface. Use the show interfaces privileged EXEC
command to see if the interface is error-disabled, disabled, or shutdown on either side of the connection. If
needed, reenable the interface.
Noncompliant cabling or powered devices can cause a PoE port fault. Use only
standard-compliant cabling to connect Cisco prestandard IP Phones and wireless access
points or IEEE 802.3af-compliant devices. You must remove any cable or device that
causes a PoE fault.
Cisco Catalyst 2960-L Series 24-Port and 48-Port Switch Hardware Installation Guide
Switch Connections
37
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