County IT sees intermittent overlay drops for fabric clients while underlay pings between edges succeed at small sizes. Which Assurance-driven conclusion best links those symptoms?
Select an answer to reveal the explanation.
Short Explanation
Little pings are like shipping postcards—they squeeze through a too-small chute that packages cannot. VXLAN adds header bulk, so an undersized underlay MTU drops real overlay frames while 64-byte pings still smile. Assurance helps connect those underlay MTU clues to the overlay pain you are chasing.
Full Explanation
SD-Access overlays encapsulate traffic (VXLAN) and therefore require underlay MTU large enough for inner packet plus encapsulation overhead. Successful small underlay pings do not validate path MTU for production overlay frames. Catalyst Center Assurance and related insights are used to correlate underlay impairments—such as MTU black holes—with overlay client or application drops during troubleshooting.