Cisco Optical Module Decryption Method

Posted on by FS.COM

Cisco devices can only support Cisco brand optical module. While other brands optical modules absolutely can’t be supported.

If you obstinately plug in the other optical modules into the Cisco port, information like “Unsupport” or “Unknown” will be displayed. The log shows one or several of the following circumstances:

%PM_SCP-SP-3-TRANSCEIVER_UNSUPPORTED: Unsupported transceiver in LAN port */*
%PHY-4-CHECK_SUM_FAILED: SFP EEPROM data check sum failed for SFP interface Gi1/0/25
%GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port Gi1/0/25 has bad crc
%PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/25, putting Gi1/0/25 in err-disable state

Why does this happen?

Cisco SFP security key mechanism prevents the use of non-Cisco SFP to ensure quality and compatibility. Each SFP is encoded using extraordinary software key. If a SFP module does not contain a valid key, then the port will be closed when the SFP inserted into Cisco switch. And  the port will not send or receive any data packet.

Fiberstore-Cisco-SFP

Then how to solve the Cisco optical module security key mechanism?

  • Enter the global configuration mode;
  • Play is hidden on the command (Do not press the “tab” key);
  • Service unsupported-transceiver no errdisable detect cause gbic-invalid speed non-negotiate;
  • Save configuration;
  • Plug in optical module;
  • Finish.

In this way, switch will not go to check the serial number of the GBIC. Then the user can put the third-party GBIC or SFP into the machine to make the network operate. Of course, based on the principle of “encouraging”, the previous instruction is “hidden version” of instruction. If you try few times and see there is absolutely no command list inside the unsupported transceiver after finishing the instructions. What’s worse, the machine would never accept as you press “tab”. I’m afraid you should better not come to the mysterious GBIC or SFP.

Cisco company 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.

FS.OCM-Cisco-SFP-test

So, you should choose a compatible module. FS.COM offers customers a wide variety of fiber optic transceiver for data center, enterprise wiring closet, and service provider transport applications. Fiberstore is an professional manufacturer & supplier of fiber transceivers. All of our fiber optic transceivers are tested in-house prior to shipping to guarantee that they will arrive in perfect physical and working condition. We guarantee our fiber transceivers to work in your system and all of our fiber transceivers come with a lifetime advance replacement warranty.

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