Oracle Linux: Link Speed of Ethernet Interface is Changed from 1Gbps to 100Mbps with out configuration changes (Doc ID 2169185.1)

Last updated on AUGUST 11, 2016

Applies to:

Linux OS - Version Oracle Linux 5.0 and later
Information in this document applies to any platform.

Symptoms

A NIC, which was linked up as 1Gbps with auto-negotiation at the OS boot time, is suddenly changed to be 100Mbps without any operations. This would be happen not only with link speed, but also with others like duplex etc.

For example, /var/log/messages shows:

 

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms