# These two lines show a "regular" re-negotiation, which only gives an interruption of a few seconds:

May 27 02:16:52 websdr kernel: [3645142.488217] e1000e: eth1 NIC Link is Down
May 27 02:16:55 websdr kernel: [3645145.313053] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None


# These two lines show a re-negotiation which chooses 100 Mbps:

May 27 03:03:45 websdr kernel: [3647955.424224] e1000e: eth1 NIC Link is Down
May 27 03:03:53 websdr kernel: [3647963.960870] e1000e: eth1 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None