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Routing & Switching · Intermediate

VXLAN Network Identifier (VNI)

The 24-bit segment ID in the VXLAN header that identifies a Layer 2 (L2VNI) or Layer 3 (L3VNI) virtual network.

Definition

VLANs are mapped to L2VNIs on each VTEP, so local VLAN numbers can differ while the VNI is consistent fabric-wide. An L3VNI identifies a tenant VRF for routed traffic in symmetric IRB.

Example

vlan 10 / vn-segment 10010 on Cisco NX-OS

Exam tip

Any VLAN ID can map to any VNI; VNIs, not VLAN IDs, must match across the fabric.

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