Without trying to go into too much pointless background info
I have a 3850 stack with a number of LAG's providing converged network services to some VMWare and Hyper-V hosts.
I was trying to enable jumbo frames (system mtu 9198) and all my things broke. Of course it was during the day - so I hurriedly put it back to 1500.
Looking at the logs, it appears that it was going through and individually assigning the new MTU to the physical interfaces, and I may have panicked.
The question is - would eventually all physical interfaces in the LAG get the correct MTU, port-channels recombine, and and happiness resume on the network if I had just waited another minute or two?
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