VXLAN
VXLAN wraps Ethernet frames in UDP so a Layer 2 segment can span a routed fabric, with a 24-bit VNI naming each segment. Interviewers use it for data-centre and container networking.
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- Encapsulation Format5 questions
- VTEPs and Tunneling5 questions
- Flood-and-Learn5 questions
- EVPN Control Plane6 questions
- Multitenancy and VNIs5 questions
- MTU and Underlay Design5 questions
questions
page 2 of 2You must replace flood-and-learn with BGP EVPN across a 40-rack VXLAN fabric; how would you sequence the move, and what do you trade?
level: principalimportance: nice to knowfreq 8%
basics
~20 sBring EVPN up on every leaf first, move VNIs over one at a time so type-3 routes take over BUM membership, then add ARP suppression, anycast gateways and multihoming; you trade flooding for BGP state and control-plane operations on every leaf.
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