Cisco Catalyst 2960 Series, Configuration Manual

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Monitoring PoE Port Status
• show controllers power inline privileged EXEC command
• show power inline EXEC command
• debug ilpower privileged EXEC command
Disabled Port Caused by False Link-Up
If a Cisco powered device is connected to a port and you configure the port by using the power inline never
interface configuration command, a false link-up can occur, placing the port into an error-disabled state. To
take the port out of the error-disabled state, enter the
shutdown and the no shutdown interface configuration
commands.
You should not connect a Cisco powered device to a port that has been configured with the power inline
never command.
Ping
The Switch supports IP ping, which you can use to test connectivity to remote hosts. Ping sends an echo
request packet to an address and waits for a reply. Ping returns one of these responses:
•
Normal response
—
The normal response ( hostname is alive) occurs in 1 to 10 seconds, depending on
network traffic.
• Destination does not respond — If the host does not respond, a no-answer message is returned.
• Unknown host — If the host does not exist, an unknown host message is returned.
•
Destination unreachable
—
If the default gateway cannot reach the specified network, a
destination-unreachable message is returned.
•
Network or host unreachable
—
If there is no entry in the route table for the host or network, a network
or host unreachable message is returned.
Related Topics
Executing Ping, on page 1643
Example: Pinging an IP Host, on page 1652
Layer 2 Traceroute
The Layer 2 traceroute feature allows the switch to identify the physical path that a packet takes from a source
device to a destination device. Layer 2 traceroute supports only unicast source and destination MAC addresses.
Traceroute finds the path by using the MAC address tables of the Switch in the path. When the Switch detects
a device in the path that does not support Layer 2 traceroute, the Switch continues to send Layer 2 trace queries
and lets them time out.
The Switch can only identify the path from the source device to the destination device. It cannot identify the
path that a packet takes from source host to the source device or from the destination device to the destination
host.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Information About Troubleshooting the Software Configuration