VXLAN (Virtual Extensible LAN) tunnels are used to encapsulate Layer 2 traffic over a Layer 3

network, a key feature in Huawei’s data center solutions. The endpoints of a VXLAN tunnel are

VXLAN Tunnel Endpoints (VTEPs), identified by their IP addresses.

Tunnel Identification: A VXLAN tunnel is uniquely identified by the pair of VTEP IP addresses (local

and remote), along with the VNI (VXLAN Network Identifier). This pair ensures the tunnel is specific

to the communication path between the two VTEPs.

Tunnel Establishment: During setup, VTEPs exchange information to learn each other’s IP addresses.

This can occur manually (static configuration) or dynamically (e.g., via BGP EVPN). The underlay

network must provide Layer 3 reachability between the VTEP IP addresses, typically using routing

protocols (e.g., OSPF, BGP) to ensure IP connectivity.

Reachability Condition: If the local and remote VTEP IP addresses are reachable at Layer 3, the tunnel

can be established, allowing encapsulation and decapsulation of VXLAN traffic. This is a fundamental

requirement in Huawei’s VXLAN implementation.

The statement is TRUE (A) because a VXLAN tunnel’s identification and establishment depend on

reachable VTEP IP address pairs at Layer 3.

Reference: Huawei HCIP-Data Center Network Training – VXLAN Tunneling; CloudFabric VXLAN

Deployment Guide.