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speed (Gigabit Ethernet interface)



Hierarchy Level

Release Information

Statement introduced in Junos OS Release 18.1R1 for MX10003 and MX204 routers.


Starting in Junos OS Release 18.1R1, on MX10003 and MX204 routers, the 10-Gbps port can operate in 1-Gbps mode also. On MX10003 and MX204 routers, when the port operates in 10-Gbps speed, you can change the operating speed to 1Gpbs using the configuration speed 1G in this configuration statement. Once you commit this configuration, the operating speed of the 10-Gbps port changes to 1-Gbps speed.

On fixed-port PIC and non-MACsec MIC of MX10003 router, you can configure one or all 10-Gbps port operating in 4X10-Gbps speed to operate in 1-Gbps speed.

On MX204 routers, you can configure the 4X10-Gbps port on one of the fixed-port PICs to operate in 1-Gbps mode. And on the other fixed-port PIC, you can configure the 10-Gbps port to 1-Gbps speed.

See MX10003 MPC Rate-Selectability Overview and MX204 Router Rate-Selectability Overview for more details.

On MX10003 and MX204 routers, 1-Gbps speed is supported with speed 1g configuration. The 1-Gbps speed is only supported in non-autonegotation mode. For optics other than SFP-T, in 1-Gbps mode, the peer interfaces must be configured to non-autonegotiation mode.

  • On the MX10003 router, the MACsec MIC does not provide 1-Gbps speed. If you attempt to change the operating speed to 1-Gbps, syslog displays that this feature is not supported on the MACsec MIC.

  • On MX10003 and MX204 routers, rate selectability at PIC level and port level does not support 1-Gbps speed.

  • On MX10003 and MX204 routers, the interface name prefix must be xe.

  • On MX10003 and MX204 routers, even after configuring 1-Gbps speed, the protocol continues to advertise the bandwidth as 10-Gigabit Ethernet.

  • On MX10003 and MX204 routers, Link Aggregation Group (LAG) is supported on 10-Gbps speed only. It is not supported on 1-Gbps speed.

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.




1G—Supported ports operate at 1-Gbps speed.

10G—Supported ports operate at 10-Gbps speed.

Required Privilege Level

interface—To view this statement in the configuration.

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