In Huawei's SD-WAN solution, which of the following routing protocols are used to transmit VPN routes between CPEs?

Question

Options

• AOSPF
• BRIP
• CBGP
• DIS-IS

• A
  2% (1)
• B
  4% (2)
• C
  84% (38)
• D
  9% (4)

Explanation

BGP (Border Gateway Protocol) is the correct choice because it is the standard protocol for exchanging VPN routing information between CPEs (Customer Premises Equipment) in SD-WAN architectures - specifically, MP-BGP (Multiprotocol BGP) carries VPN route targets and NLRI across the overlay network, making it ideal for large-scale, multi-site deployments.

OSPF (A) and IS-IS (D) are link-state interior gateway protocols designed for routing within a single autonomous system, not for distributing VPN routes across WAN edges. RIP (B) is a distance-vector IGP that is too limited in scalability and lacks VPN awareness entirely. None of A, B, or D were designed to carry VPN label/route-target information across tunnel overlays.

Memory tip: Think "BGP = Big Global Protocol" - it's the same protocol that runs the global internet and scales across autonomous systems, which is exactly why SD-WAN solutions like Huawei's choose it to exchange VPN routes between geographically dispersed CPEs.

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