What MTU size is recommended for a Cisco SD-Access fabric?
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Correct answer: 9100.
Why this is the answer
Cisco SD-Access fabrics recommend an MTU of 9100 bytes. This larger MTU, often referred to as "jumbo frames," accommodates the overhead introduced by encapsulation protocols like VXLAN (Virtual Extensible LAN), which is fundamental to SD-Access. VXLAN adds a significant header to the original Ethernet frame. An MTU of 9100 ensures that the encapsulated packets can traverse the underlay network without fragmentation, which improves performance and reduces CPU utilization on network devices. An MTU of 1500 bytes is the standard Ethernet MTU and would lead to excessive fragmentation with VXLAN. 4464 and 17914 are not standard recommended MTU sizes for SD-Access.
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