Huawei Certified ICT Expert – Routing and Switching (HCIE-RS) — Question 38

Which of the following statements are correct about the MP_REACH_NLRI attribute of BGP4+? (Choose all that apply.)

Answer options

• A. The length of the next hop address can be 16 or 32.
• B. When the length of the next hop address is 16, the Network Address of Next Hop field carries the link-local address.
• C. The NLRI field carries the IPv6 route prefix and mask
• D. The value of the address family identifier (API) is 2, indicating IPv6.

Correct answer: A, C

Explanation

Option A is correct because the next hop address in BGP4+ can indeed be either 16 or 32 bits long depending on the address type. Option C is also correct as the NLRI field is used to convey the IPv6 route prefix and mask. Options B and D are incorrect; B misrepresents the link-local address context, and D inaccurately describes the address family identifier's value, which is not specified in the question.