MGBT1 Compatibility

Unanswered Question
Aug 20th, 2009
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Hello Everyone,

Recently purchased some 1000Base-T Mini-GBIC SFPs (MGBT1) under the impression that they were full-fledged Cisco devices with intent to use them in our 3560G-48TS. As I hotplug them in, I receive the following:

%GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port Gi0/48 has bad crc
%PM-4-ERR_DISABLE: gbic-invalid error detected on Gi0/48, putting Gi0/48 in err-disable state

The interfaces do not come online at this point, nor does it seem I can force them to. My research has found mixed feelings on whether this error is show-stopping or not.

I am running the following on my 3560G

Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(44)SE6

Does anyone have any input as to whether the MGBT1 can actually (reliably) work with the 3560G and if so, how?

Please let me know if I have forgotten any critical information.



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David Hornstein Thu, 08/20/2009 - 19:28
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Hi Jeffrey

The datasheet for your product which i have copied shows the SFP that are supported on your switch;

Scroll down to nearly the bottom of that datasheet page and you will see the SFP's appropriate for that model.

The MGBT1 is a SFP that is supported by the Cisco Small Business and Small Business Pro range of product.

But if you want a 1000T  SFP for the 3560G  you need to order the cisco p/n  GLC-T=

Here are some of the SFP's supported by your product, I copied part of the table below from the datasheet;


jeffrey.d.kois@... Fri, 08/21/2009 - 05:40
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Thank you, this is the matrix I was trying to find but could not. Just to be clear, does this imply that using the MGBT1 will not work at all or it simply is not supported/recommended? I'm fairly close to believing the former, but I just want to be sure.

Thanks again,


David Hornstein Fri, 08/21/2009 - 07:52
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Jeffrey there is a interesting link below, please read it carefully, regarding insertion of 3rd party SFP.

referenece is from

The following link is really handy, showing cisco model and the SFPs supported.