What is the minimum MTU value that must be supported by the ISN to allow control plane endpoint information exchange between sites?

An existing Cisco ACI Multi-Site setup with default fabric settings contains endpoints that communicate with an MTU of 1500. What is the minimum MTU value that must be supported by the ISN to allow control plane endpoint information exchange between sites?
A. 9000
B. 1554
C. 9100
D. 1600

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One thought on “What is the minimum MTU value that must be supported by the ISN to allow control plane endpoint information exchange between sites?

  1. D is correct.
    The ISN also requires MTU support above the default 1500-byte value. VXLAN data-plane traffic adds 50 bytes of overhead (54 bytes if the IEEE 802.1q header of the original frame is preserved), so you must be sure that all the Layer-3 interfaces in the ISN infrastructure can support that increase in MTU size (a generic recommendation is to support at least 100 bytes above the minimum MTU required). The right MTU value to configure in the ISN is the highest one required to support the following requirements:

    https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739609.html

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