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C6509E/SUP2T/X6904-40G/FOURX Converter will not recognize 1G Optic Transceiver

We have a C6509E with dual VS-SUP2T-10G running 15.0(1)SY6.  A WS-X6904-40G-2T module is in slot1 and 2. They have CVR-CFP-4SFP10G converters in the slots.  The GLC-SX-MMD 1Gbps optical transceivers are not recognized, even though they are on the supported list.

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Beginner

A simple solution... upgrade to 15.1(2)SY2!  Now they are recognized.

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I am having the same issue, only on 15.1(2)SY4.

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I have 15.1(2)SY4a and don't see an option to change hw-module operational mode to 1G, only from 40G to TenGig, looks like the switch sees the 1G SFP (show interf transceiver) though. Does anyone else have the same problem?

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