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This pops up all the time for me, and is one of the reasons I can't stand clish. When you turn auto-negotiation on, it removes the manual speed/duplex line. But when it's already on, it leaves the line alone. You have to turn it off, then back on. And the speed/duplex line can reappear later for no known reason. Incredibly irritating.
I haven't yet found a way to remove the MTU line once it's added. You just have to add it to the other member. Also incredibly irritating.
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