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You have to add up the amount of overhead each of your protocols that you are using on your network and ensure that each underlying piece of your network can support that size or lower.

We ran into this problem as well. We had tenant VXLAN running which adds an overhead of 50 bytes. Then we underneath that we had VLAN that was moving data around. That was 4 bytes. So I had to add that in as well. So we had to move our VM's down to 1400 to cover all the bases.