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Chapter 49
Configuring Gigabit Ethernet
Autonegotiation
Gigabit Ethernet Autonegotiation Overview
Configuring Gigabit Ethernet Autonegotiation
Gigabit Ethernet Autonegotiation Overview on page 797
Configuring Gigabit Ethernet Autonegotiation on page 797
Autonegotiation is enabled by default on all Gigabit Ethernet and Tri-Rate Ethernet
copper interfaces. However, you can explicitly enable autonegotiation to configure
remote fault options manually.
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.
Configuring Gigabit Ethernet Autonegotiation with Remote Fault on page 798
Configuring Flow Control on page 798
Configuring Autonegotiation Speed on MX Series Routers on page 798
Displaying Autonegotiation Status on page 798
Gigabit Ethernet Autonegotiation Overview
797
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