Speed config: Change 10-Gbps port to operate in 1-Gbps speed

Junos OS supports different operation modes 10-Gbps, 40-Gbps, and 100-Gbps speed. When the port is operating in 10-Gbps speed, you can change the operating speed to 1Gpbs using a new CLI option, speed 1g/10g, for the existing set interfaces [intf-name] gigether-options command. Once you commit this configuration, the operating speed of the 10-Gbps port changes to 1-Gbps speed without any FPC, PIC, or interface bounce. 

To view the speed configured for the interface, execute the show interfaces extensive command. The Speed Configuration output parameter in the command output indicates the current operation speed of the interface. If the interface is configured with 1-Gbps speed, then Speed Configuration displays 1G; if the interface is configured with 10-Gbps speed, Speed Configuration displays AUTO.