Note: For Gigabit Ethernet interfaces installed in J4350 and J6350 Services Routers, when you manually configure either the link mode or speed settings, the system ignores the configuration and generates a system log message. When autonegotiation is enabled and you specify the link mode and speed, the link autonegotiates with the manually configured settings. When autonegotiation is disabled and you configure both the link mode and speed, the link operates with the manually configured settings. If you disable autonegotiation and do not manually configure the link mode and speed, the link operates at 1000 Mbps full duplex.

Note: When you configure the Tri-Rate Ethernet copper interface to operate at 1 Gbps, autonegotiation must be enabled.