Refer to the exhibit. A VXLAN data center fabric consists of three hosts mapped to different VLANs. Ingress VTEPs perform Layer 2 bridging and Layer 3 routing. Egress VTEPs only perform a Layer 2…

The correct answer is A. VLAN 100 to Layer 2 VNI 2020. In a VXLAN fabric using Symmetric IRB (Integrated Routing and Bridging), inter-VNI (inter-VLAN) traffic requires both a Layer 2 VNI (L2VNI) per VLAN and a shared Layer 3 VNI (L3VNI) for routing. The ingress VTEP performs L3 routing using the L3VNI to encapsulate the packet and…

Network

Question

Refer to the exhibit. A VXLAN data center fabric consists of three hosts mapped to different VLANs. Ingress VTEPs perform Layer 2 bridging and Layer 3 routing. Egress VTEPs only perform a Layer 2 bridging lookup. Which VNI values must be set to allow inter-VNI communication?

Exhibit

Options

AVLAN 100 to Layer 2 VNI 2020
BVLAN 100 to Layer 2 VNI 2020
CVLAN 100 to Layer 2 VNI 2020
DVLAN 100 to Layer 2 VNI 1010

How the community answered

(38 responses)

A
89% (34)
B
3% (1)
C
3% (1)
D
5% (2)

Explanation

In a VXLAN fabric using Symmetric IRB (Integrated Routing and Bridging), inter-VNI (inter-VLAN) traffic requires both a Layer 2 VNI (L2VNI) per VLAN and a shared Layer 3 VNI (L3VNI) for routing. The ingress VTEP performs L3 routing using the L3VNI to encapsulate the packet and send it across the fabric; the egress VTEP then performs an L2 bridging lookup using the destination VLAN's L2VNI to deliver the frame. Answer A represents the correct complete set of VNI mappings (L2VNIs per VLAN plus the L3VNI) that satisfies this symmetric IRB model. The incorrect options either use wrong VNI-to-VLAN bindings (option D maps VLAN 100 to L2VNI 1010, which conflicts with the correct assignment) or are otherwise incomplete.

Topics

#VXLAN#VNI mapping#Network Virtualization#Data Center Networking

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