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speed (Gigabit Ethernet interface)


Hierarchy Level


Configure the operating speed of the 8-port 10-Gigabit Ethernet PIC from default 10-Gbps port speed to 1-Gbps port speed. Each of the interfaces in the 8-port 10-Gigabit Ethernet PIC can be independently configured to 1Gbps or 10Gbps speeds. For information about platforms support, see hardware compatibility tool (HCT).

Autonegotiation is automatically disabled when 1-Gbps speed is configured on the interfaces.

On 1/10-Gbps capable Gigabit Ethernet SFP interfaces, the duplex is always full and the speed matches that of the inserted optic. These interfaces support either 1-Gbps or 10-Gbps SFP optics. For SRX Series Firewalls, the display and configuration is always xe- only, even if a 1G optic is inserted. The xe- value is used to denote that the interface is 10G capable. If a 1G optic is used, show commands for the interface will display the correct speed, but the config will always show as xe-. If a speed configuration is changed, you cannot change it again in the next 180 seconds. The interface link might drop down, if you try to change the speed configuration again within 180 seconds of the first speed configuration change. The 8x10-Gbps ports supports multiple port speeds, that is, some ports operates at 10G speed and some at 1G speed. To view the speed configured for the interface, execute the show interfaces extensive command. The Speed Configuration field's value of 1G or AUTO in the command output indicates whether the current operation speed of the interface is 1 Gbps or the default 10 Gbps, respectively.


  • 1g — Link speed of 1 Gbps

  • 10g — Link speed of 10 Gbps

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 18.1R1.