Cisco Catalyst 2960 Series, Configuration Manual

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If a remote device does not autonegotiate, configure the duplex settings on the two ports to match. The
speed parameter can adjust itself even if the connected port does not autonegotiate. Note
Troubleshooting SFP Module Security and Identification
Cisco small form-factor pluggable (SFP) modules have a serial EEPROM that contains the module serial
number, the vendor name and ID, a unique security code, and cyclic redundancy check (CRC). When an SFP
module is inserted in the Switch, the Switch software reads the EEPROM to verify the serial number, vendor
name and vendor ID, and recompute the security code and CRC. If the serial number, the vendor name or
vendor ID, the security code, or CRC is invalid, the software generates a security error message and places
the interface in an error-disabled state.
The security error message references the GBIC_SECURITY facility. The Switch supports 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. Note
If you are using a non-Cisco SFP module, remove the SFP module from the Switch, and replace it with a
Cisco module. After inserting a Cisco 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, see 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 reinsert
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.
Executing Ping
If you attempt to ping a host in a different IP subnetwork, you must define a static route to the network or
have IP routing configured to route between those subnets.
IP routing is disabled by default on all Switch.
Though other protocol keywords are available with the ping command, they are not supported in this
release.
Note
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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How to Troubleshoot the Software Configuration