Cisco Networking Equipment/V1

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OVLOCKEX Violation

By default, supports only Cisco transceivers

Status: Current — The violation is standing.

Cisco networking equipment often includes SFP, SFP+, or similar transceiver slots. These accept only Cisco-made transceivers, despite the fact that these are standard components.


  • A command, service unsupported-transceiver (or in some cases, no errdisable detect cause gbic-invalid) can enable third-party transceivers. These commands are hidden and undocumented, and cannot be found via contextual help.
  • The transceiver's EEPROM can be reprogrammed to have Cisco's vendor ID, causing it to be accepted. There are mail-in services which will perform this change, for a fee.