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speed auto duplex auto Ensure the SFP matches the port type:

interface GigabitEthernet0/1 speed 100 duplex full Or use auto-negotiation (recommended for most modern networks):

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Command Failed Port Not Compatible Duplex Mode Apr 2026

speed auto duplex auto Ensure the SFP matches the port type:

interface GigabitEthernet0/1 speed 100 duplex full Or use auto-negotiation (recommended for most modern networks):

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