On Mon, Oct 10, 2016 at 9:33 PM, John R Pierce <pierce at hogranch.com> wrote: > > I've got a pair of identical CentOS 6.7 servers, with SuperMicro X8DTE-F motherboards, these have 2 each Intel 82574L ethernet ports. The eth0 ports are plugged in with 10' runs of brand new cat 5e cable to a Cisco Nexxus 9000 switch (provided by the data center). > > These servers keep coming up at 100baseT rather than gigE. I've swapped ports and cables with a different server, that server gets gigE but these supermicro's are stuck at 100baseT regardless of the port or cableused. > > 'ethtool eth0' says its gigE, but 'mii-tool -v eth0' says its 100baseT and doesn't even list gigE as an option, and the cisco switches see it as 100baseT too. mii-tool doesn't support gigE. Maybe, they're not negotiating: "ethtool -s eth0 autoneg on", you can renegotiate with "ethtool -r eth0" -- Marcelo "¿No será acaso que esta vida moderna está teniendo más de moderna que de vida?" (Mafalda)