need some help on this comand

need some help on this command
!
!
interface GigabitEthernet1/0
mac-address 0000.1111.1111
ip address 10.14.0.1 255.255.255.0
negotiation auto

> what it's this commad
no shutdown

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It means it's auto negotiating

But seriously, it's auto negotiating the speed and duplex of the two devices that interface is connected to