100M (bidi) sfp not working in catalyst 2960

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Oct 6th, 2009
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I installed a GLC-FE-100BX-U transceiver

in a C2960-8TC-L switch running the latest IOS, but the interface doesn't come up.

Do I have to configure 100M sfp support somehow?

sh int shows "media type is 1000BaseLX SFP" at the moment.

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Giuseppe Larosa Tue, 10/06/2009 - 00:29
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Hello Alex,

have you placed the companion type of SFP on the other side of the link?



no special settings are needed and sh int type x/y should report the right SFP type


sh int gi0/25 | inc SFP

Full-duplex, 100Mb/s, link type is auto, media type is 100BaseFX SFP

this is from a 3560

in the link your model is not listed among the ones supporting 100M SFPs see table of supported models

Hope to help


glen.grant Tue, 10/06/2009 - 03:33
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If these are dual media type ports you may have to specify SFP instead of RJ45 .

ae3997 Tue, 10/06/2009 - 05:02
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I have tried both media type "auto-select" and "sfp" configurations.

1000M SFP:s work fine in the switch.

Oddly enough, the switch in the other end of this connection shows link up on the port connected to the 2960.


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