It's not uncommon to have a Cisco device but buy non-genuine modules for it. Third-party manufacturers produce various modules, including fiber-optic SFPs, that can be plugged into Cisco devices. And these manufacturers claim their modules are compatible with all equipment in the world: D-Link, 3Com, Allied Telesyn... and Cisco, of course, why not Cisco.
The only thing is, Cisco hardware itself isn't in a hurry to get along with non-genuine modules.
Well, let's make it.
Log in to our device and through the IOS CLI type:
service unsupported-transceiver
no errdisable detect cause gbic-invalid
The first command enables support for "unofficial" modules, and the second - prevents them from being disabled "just in case, you know".
Note. The commands are hidden, you won't get hints via "?", and of course they won't work in the Packet Tracer emulator - only on "live" hardware. Type them exactly as shown.
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