With bond 802.3ad one interfaces sometimes fall back to 10 Mpbs

  • I'm using OMV 4.1.35 along with an ASRockRack C236 WSI. This motherboard has 2 NICs and is attached to Unifi network switch. Normally, both links where up with 1000 Mpbs.

    I cannot find a reason, but sometimes the interface enp0s31f6 falls back to 10 Mpbs which gives trouble for some clients accessing NAS. This happened rarely but only this interface is affected, the other NIC is fine alltime.

    It seems when link to switch is broken (i.e. when switch has a power failure - the NAS itself has an UPS), the autonegotiation fails when link comes up again. But I'm not sure if this is the real reason.

    When this happens, I have to SSH into the NAS and run

    ifdown bond0 && ifup bond0

    After that everything is fine again. dmesg gives me the following.

    I cannot believe this should be a fault of OMV, but I don't know where I have to begin my research. Or has anyone an idea what I can do to automatically recover the interface to full speed?

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