Monitoring Sfp Module Status; Using Ping; Understanding Ping - Cisco WS-C3750-48PS-S Software Configuration Manual

Monitoring SFP Module Status

The security error message references the GBIC_SECURITY facility. The Catalyst 3750 switch supports
Note
SFP modules and does not support GBIC modules. Although the error message text refers to GBIC
interfaces and modules, the security messages actually refer to the SFP modules and module interfaces.
For more information about error messages, refer to the system message guide for this release.
If you are using a non-Cisco approved SFP module, remove the SFP module from the switch, and replace
it with a Cisco-approved module. After inserting a Cisco-approved SFP module, use the errdisable
recovery cause gbic-invalid global configuration command to verify the port status, and enter a time
interval for recovering from the error-disabled state. After the elapsed interval, the switch brings the
interface out of the error-disabled state and retries the operation. For more information about the
errdisable recovery command, refer to the command reference for this release.
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,
refer to the show interfaces transceiver command in the command reference for this release.

Using Ping

This section consists of 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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Catalyst 3750 Switch Software Configuration Guide
39-14
Understanding Ping, page 39-14
Executing Ping, page 39-15
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.
Chapter 39 Troubleshooting
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