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Duncan Fairley
Asked: 2017-07-14 08:45:26 +0800 CST

Cisco SFP module detection

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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.

networking

1 Answers

  1. 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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