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This is a documentation defect to mention that auto-negotiation cannot be disabled for QSFPH40G-CUxM in the existing Firewall eXtensible Operation System (FXOS) versions. For this specific SFP, auto-negotiation is always enabled.
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Because of the defect CSCwd25544, the auto-negotiation value for interfaces with QSFPH40G-CUxM is No, however at the hardware level it is always enabled. firepower# scope eth-uplink;scope fabric a;scope interface Ethernet2/1; firepower /eth-uplink/fabric/interface # show detail Interface: Port Name: Ethernet2/1 User Label: Port Type: Data Admin State: Enabled Oper State: Link Down State Reason: Link failure or not-connected flow control policy: default Auto negotiation: No <----------
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