тут https://apps.juniper.net/hct/product/#prd=MX204 ?
Support for QFX-QSFP-DAC-1M and QFX-QSFP-DAC-3M were removed from MX204/MX10003/EX9251/EX9253 because it was later identified as unsupported.
а там нет даков для 204го
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