Cisco SFP module detection

cisconetworkingsfpswitch

I have 2 Cisco SG500X switches that I want to stack over 10G fiber. I have two 3rd-party SFP-10G-SR modules which I'm having trouble with.

Should SFP modules be detected by the switch when plugged in, regardless of whether fiber is attached? I've checked logs when attaching/removing the modules and nothing shows up. I'm trying to figure out if the issue is with the modules or the fiber.
Thanks.

Best Answer

With IOS, you will not detect non-Cisco SFP modules until you enter the hidden command service unsupported-transceiver in configuration mode.

Note that this is a hidden command, so completion is not available while typing the command.

On this example, with a Cisco 3750 switch, you will notice the warning displayed by IOS when you activate this service:

user#conf t
user(config)#service unsupported-transceiver
 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.

Answer to your first question: YES, SFP modules will be detected by the switch when plugged in, regardless of whether fiber is attached or not. But only after having entered this hidden command.

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