When using VXLAN encapsulation in SD-Access, what is the minimum MTU devices should be configured with?
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Correct answer: 1550.
Why this is the answer
The correct answer is 1550. VXLAN encapsulation adds a 50-byte overhead to the original Ethernet frame. To accommodate this overhead without fragmentation, the underlying network devices (including switches and routers in the underlay) must have an MTU configured to at least the original frame size plus the VXLAN overhead. A standard Ethernet frame is 1500 bytes. Therefore, 1500 (original frame) + 50 (VXLAN overhead) = 1550 bytes. 1492 is a common MTU for PPPoE, but insufficient for VXLAN. 1500 is the standard Ethernet MTU, but doesn't account for the VXLAN overhead. 1518 is the maximum size of an Ethernet frame including the VLAN tag, but still too small for VXLAN.
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