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speed (Gigabit Ethernet interface)


Hierarchy Level


(MX10003, MX204, MX10008, and MX10016 routers) the 10-Gbps port can operate in 1-Gbps mode also. When a port operates in 10-Gbps speed, you can change the operating speed to 1-Gpbs using the configuration speed 1G in this configuration statement. After 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 any 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. On MX10003 and MX204 routers, 1-Gbps speed is supported with speed 1g configuration. On MX204 routers, the 1-Gbps SFP port supports auto-negotiation. You can configure auto-negotiation by using the command set interfaces interface-name gigether-options auto-negotiation. For more information, see auto-negotiation.

On JNP10K-LC2101 MPC, you can configure one or all 10-Gbps ports operating in 4x10-Gbps speed to operate in 1-Gbps speed. Also, autonegotiation is supported when the interface speed is configured for 1-Gbps speed.

Starting in Junos OS Release 20.4R1, you can configure 1-Gbps speed on all 40 10-Gbps Ethernet ports of the MPC7E-10G line cards.

As of Junos OS Release 23.1R1, the MX304 supports 1G fibre optic speeds in addition to the previously supported speeds of 400G, 100G, 40G, 25G, and 10G.

  • 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.

  • (MX10003, MX204, MX10008, and MX10016 routers) Rate selectability at PIC level and port level does not support 1-Gbps speed.

  • (MX10003, MX204, MX10008, and MX10016 routers) The interface name prefix is xe.

  • (MX10003, MX204, MX10008, and MX10016 routers) 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.

  • On MX304 for 1G interface, the maximum MTU supported is 2000 bytes. Hence, the maximum MRU supported is 2008 bytes.

  • On MX304, 1G interface does not support MACsec in this release.

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.

Release Information

Statement introduced in Junos OS Release 18.1R1.