Which of the following inter-AS MPLS L3VPN solutions needsASBRs to transmit VPNv4 routes?
Option C
Option B
Option A
Option D
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
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