OSPF (Open Shortest Path First) is a routing protocol used in the underlay network of Huawei’s

CloudFabric DCNs. Let’s evaluate each statement:

A. Typically, the IP address of Loopback0 is configured as the VTEP IP address and the same IP

address is planned for active-active leaf nodes in the same group: This is true. Loopback0 IP is

commonly used as the VTEP IP for stability, and in active-active leaf node groups (e.g., M-LAG), the

same IP can be configured with VRRP or anycast to ensure consistency. TRUE.

B. The network type of spine and leaf nodes can be set to P2P in order to accelerate convergence:

This is true. Setting OSPF network type to Point-to-Point (P2P) on spine-leaf links reduces overhead

(e.g., no DR/BDR election) and speeds up convergence, a recommended practice in Huawei DCNs.

TRUE.

C. This routing design is recommended when the DC has more than 300 switches: This is false. OSPF

is suitable for smaller to medium-sized DCNs (e.g., up to 200-300 switches). For larger networks

(>300 switches), EBGP is preferred due to better scalability and reduced complexity. FALSE.

D. It is recommended that all devices be planned in Area 0: This is false. While a single Area 0 is

possible for small DCNs, multi-area OSPF is recommended for larger networks to manage scalability

and reduce routing table size, avoiding a flat Area 0 design. FALSE.

Thus, A and B are true statements about OSPF routing design in a DC underlay.

Reference: Huawei CloudFabric Data Center Network Solution – Underlay Design; HCIP-Data Center

Network Training – OSPF in DCN.