Which of the following inter-AS MPLS L3VPN solutions needsASBRs to transmit VPNv4 routes?

Comprehensive and Detailed Explanation:

Inter-AS MPLS L3VPN Option BrequiresASBRs to exchange VPNv4 routesusingeBGPwith label information.

Analysis of Inter-AS VPN Solutions:

Option B uses eBGP to exchange labeled VPNv4 routes between ASBRs but does not require MPLS between ASBRs.

Option A does not exchange VPNv4 routes over ASBRs (uses IP routing instead).

Option C uses MP-BGP and requires full MPLS between ASBRs.

Since Option B requires ASBRs to exchange VPNv4 routes, the correct answer is B.

????Reference: Huawei HCIE Datacom – MPLS Inter-AS VPNs