Extract from VMware VMC on AWS training course, "A maximum transmission unit (MTU) of 1,600 or more is required so that NSX-T Data Center can support the GENEVE overlay for frame encapsulation."
What do we have within the SDDC?
Yeah NSX-T with a T0 Router and between each physical ESXi you also want to ensure that GENEVE Traffic for the Segments is working, therefore 1600 is the minimum MTU on the HW or else no Networking between the Hosts.
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