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Updated:April 21, 2022
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This document describes a common problem and mitigation techniques with certain gigabit interface converter (GBIC) or small form-factor pluggable (SFP) optical transceiver modules on a Catalyst 3850 switch.
When you insert specific GBICs on a Catalyst 3850 switch, you might receive these error logs:
%PLATFORM_PM-6-MODULE_ERRDISABLE: The inserted SFP module with interface name Gix/y/z is not supported %PM-4-ERR_DISABLE: gbic-invalid error detected on Gix/y/z, putting Gix/y/z in err-disable state
The issue has commonly been seen with GLC-SX-MMD and third-party SFPs.
Keep in mind these points before you consider this to be a hardware issue with the SFP, sub-module (C3850-NM), or Catalyst 3850 backplane.
Some SFPs need configuration and actions in order to be able to work in a Catalyst 3850 switch (mostly when they are manufactured by a third-party vendor). Enter these commands:
3850(config)# no errdisable detect cause gbic-invalid 3850(config)# service unsupported-transceiver
Remove the SFP module, shut down/do not shut down the port, and reinsert the SFP module.
Take into consideration these software defects:
Cisco bug ID CSCut94443 - GLC-SX-MMD is not recognized after OIR
Cisco bug ID CSCuj31712 - certain Vendor Sfp force ports to err-disable upon OIR
It is recommended to go to a stable version of code whether you encounter those bugs or not. The recommended version on cisco.com has helped to fix this type of incident. See these documents for more information: