In some Cisco equipment you may run into a common error when
installing a 3rd party transceiver.
Here is an example of what will be displayed:
transceiver found in Gi1/0/0
GBIC in port 65538 has bad crc
Depending on the model you have the wording may
be different, however the solution remains the same.
Simply input this command
into the CLI: service unsupported-transceiver
This will cause this to be displayed on your
Warning: When Cisco
determines that a fault or defect can be traced to
the use of third-party transceivers installed by a customer or reseller,
then, at Cisco’s discretion, Cisco may withhold support under warranty or
a Cisco support program. In the course of providing support for a Cisco
networking product Cisco may require that the end user install Cisco
transceivers if Cisco determines that removing third-party parts will
assist Cisco in diagnosing the cause of a support issue.
This error is Cisco telling you they want you to
buy their transceivers and will not troubleshoot or guarantee 3rd party
transceivers. You must go through the manufacture of the transceiver for
support if they malfunction.
Note: This is no way voids
your warranty with Cisco.
Now enter the command: no errdisable detect cause
This disables the auto port shutdown upon inserting a 3rd party
transceiver. At this point your switch should happily accept your new
If for some reason your transceiver is still not working at this
point please open a ticket with us here.