Which of the following statements is false about the overlay technology and VXLAN protocol?

VXLAN is an overlay technology that encapsulates Layer 2 frames within UDP packets to create scalable virtual networks, widely used in Huawei’s data center architectures. Let’s evaluate each statement:

A. A VXLAN tunnel endpoint that performs encapsulation is called a VNI:This is incorrect. A VXLAN Tunnel Endpoint (VTEP) is the device (physical or virtual) that performs encapsulation and decapsulation. The VNI (VXLAN Network Identifier) is a 24-bit field in the VXLAN header that identifies the virtual network, not the endpoint.FALSE.

B. VXLAN uses ECMP of the underlay network to improve network forwarding performance:Equal-Cost Multi-Path (ECMP) routing in the underlay network allows VXLAN to distribute traffic across multiple paths, enhancing load balancing and performance. This is a standard feature in Huawei’s VXLAN implementations.TRUE.

C. A VXLAN network is built based on UDP:VXLAN encapsulates Ethernet frames within UDP packets (using port 4789), making it a UDP-based overlay protocol. This is a core characteristic of VXLAN.TRUE.

D. VXLAN expands the number of subnets to 16 million and supports multi-tenancy:With a 24-bit VNI, VXLAN supports up to 16 million (2^24) unique network identifiers, enabling extensive subnet segmentation and multi-tenancy, a key advantage over traditionalVLANs (4096 limit).TRUE.

Thus,Ais the false statement because a VTEP, not a VNI, is the tunnel endpoint that performs encapsulation.References:Huawei CloudFabric Data Center Network Solution – VXLAN Overview; HCIP-Data Center Network Training – VXLAN Protocol.