What is a benefit of Inter-AS L3VPN Option AB?

The correct answer is B. It allows one MP-BGP session between ASBRs reducing CPU utilization. In Inter-AS L3VPN Option B (often paired with the back-to-back VRF of Option A as “Option AB”), the two AS‐boundary routers form a single MP-BGP session that carries all VPNv4 routes between the ASes.

Layer 3 VPNs

Question

Options

AIt uses multiple physical interfaces to create connections for each customer shared between
BIt allows one MP-BGP session between ASBRs reducing CPU utilization.
CIt allows for customer SLAs to be met within a dual service provider.
DIt places VRF data plane traffic into the global data plane to reduce CPU utilization.

How the community answered

(16 responses)

B
94% (15)
D
6% (1)

Explanation

In Inter-AS L3VPN Option B (often paired with the back-to-back VRF of Option A as “Option AB”), the two AS‐boundary routers form a single MP-BGP session that carries all VPNv4 routes between the ASes.

Topics

#Inter-AS MPLS VPN#Option AB#ASBR#MP-BGP

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