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Chapter 33
Troubleshooting
If the module is identified as a Cisco SFP module, but the system is unable to read vendor-data
information to verify its accuracy, an SFP module error message is generated. In this case, you should
remove and re-insert the SFP module. If it continues to fail, the SFP module might be defective.
Monitoring SFP Module Status
You can check the physical or operational status of an SFP module by using the show interfaces
transceiver privileged EXEC command. This command shows the operational status, such as the
temperature and the current for an SFP module on a specific interface and the alarm status. You can also
use the command to check the speed and the duplex settings on an SFP module. For more information,
see the show interfaces transceiver command in the command reference for this release.
Using Ping
These sections contain this information:
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•
Understanding 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:
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Executing Ping
Beginning in privileged EXEC mode, use this command to ping another device on the network from the
switch:
Command
ping ip host | address
OL-23389-01
Understanding Ping, page 33-13
Executing Ping, page 33-13
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.
Purpose
Ping a remote host through IP or by supplying the hostname or
network address.
Catalyst 2928 Switch Software Configuration Guide
Monitoring SFP Module Status
33-13
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Table of Contents
Troubleshooting
