Just had this EXACT problem on a MX85 (both WAN ports). Disabled EEE on the uplink switch, port is now stable. Do anyone know if there is a bug on this ? (its not anywhere in the release notes).
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if i'm overrunning the buffer on the MX then it's likely only speedtest that suffers this so far. I need to try something like dropbox, frame.io or similar on trying to saturate the upload link and if it takes a hit on it as well.
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To set a dry vlan (L2), you don't need to set anything on a L3 device (appliance). You just untag the vlan on the needed ports on the switches and they will communicate with each others.
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