A township wonders what happens to the access VLAN tag when a frame crosses the VXLAN fabric between leaves. Which data-plane statement is correct?
Select an answer to reveal the explanation.
Short Explanation
The access VLAN is a local door tag—the VTEP maps it to a VNI before the courier pouch goes across town. Spines care about outer IP reachability to VTEPs, not about preserving that original door tag on every hop. The VNI is what keeps the overlay neighborhood identity straight.
Full Explanation
VLAN-to-VNI mapping occurs at the VTEP edge. Encapsulated VXLAN packets carry the VNI in the VXLAN header while the underlay forwards to the remote VTEP IP; intermediate devices do not need the original access VLAN to remain significant on each hop. Requiring the same VLAN tag on every spine trunk misunderstands overlay encapsulation. DSCP marking is separate from VNI identity, and VXLAN preserves the inner Ethernet frame for bridging use cases. Consistent edge mapping is critical when local VLAN IDs differ between pods.