Re: Auto-negotiation - Out of business

On 29.11.2016 14:58, Bjørn Mork wrote:
poma <pomidorabelisima gmail com> writes:

I guess the same should be considered for a 'speed',
i.e. what is actually supported and advertised,
so e.g. 10 Gb/s is not offered for 1 Gb/s device.

Maybe, but that is much more complicated to get right, since it will
depend on the transceiver. Many interfaces with pluggable transceivers
can support multiple transceiver types with non-overlapping speed
support. Do you want to reject a configuration which might be valid


Can you comment on whether you think this is technically correct:

# nmcli -f 802-3-ethernet.duplex,802-3-ethernet.speed c s enp2s5
802-3-ethernet.duplex:                  full
802-3-ethernet.speed:                   10000

# ethtool -i enp2s5 | grep driver
driver: virtio_net

# ethtool enp2s5
Settings for enp2s5:
        Supported ports: [ ]
        Supported link modes:   Not reported
        Supported pause frame use: No
        Supports auto-negotiation: No
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: Unknown!
        Duplex: Unknown! (255)
        Port: Other
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: off
        Link detected: yes

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