300-420 · Question #189
Which consideration must be made when designing a Cisco SD-Access fabric underlay?
The correct answer is C. The default MTU should be increased. VXLAN adds 50 bytes to the original packet. The common denominator and recommended MTU value available on devices operating in a fabric role is 9100. Network should have a minimum starting MTU of at least 1550 bytes to support the fabric overlay. MTU values between 1550 and…
Question
Which consideration must be made when designing a Cisco SD-Access fabric underlay?
Options
- ASubnets must be reduced to decrease latency.
- BUp to six control planes are supported.
- CThe default MTU should be increased.
- DA unified policy must be used.
How the community answered
(42 responses)- A5% (2)
- B2% (1)
- C88% (37)
- D5% (2)
Explanation
VXLAN adds 50 bytes to the original packet. The common denominator and recommended MTU value available on devices operating in a fabric role is 9100. Network should have a minimum starting MTU of at least 1550 bytes to support the fabric overlay. MTU values between 1550 and 9100 are supported along with MTU values larger than 9100 though there may be additional configuration and limitations based on the original packet size.
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