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Is it supported to use QSFP+ 40G DAC in 100G port?

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TitleIs it supported to use QSFP+ 40G DAC in 100G port?
Question
 If insert QSFP+ 40G into 100G port it can be initialized:
X690-R5U9.5 # show ports 61 information detail 
Port:   61
        Virtual-router: VR-Default
        Type:           Q+CR4_3m 
        Random Early drop:      Unsupported
        Admin state:    Enabled with  100G full-duplex
        Link State:     Active, 100Gbps, full-duplex   
 Is it supported to use 40G DAC in 100G port?
Environment
  • EXOS
  • QSFP+, QSFP28
  • Summit x690
Answer
Using QSFP+ 40G DAC in 100G ports is not tested and not supported. Please use QSFP28 cables instead.
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