With two Direct Connect links to AWS, the company wants outbound traffic (on-prem→AWS) to prefer the primary link. Which BGP mechanism influences the OUTBOUND path from on-premises?
A.AS_PATH prepending on the backup link
AS_PATH affects how OTHERS choose paths to you — inbound direction.
B.Higher local preference on the primary link's received routes
Local-pref = outbound path selection on your edge. Correct.
C.Lower MED on the secondary link
MED hints inbound preference TO the peer — wrong direction.
D.Longer prefix advertisements
More specific prefixes win regardless of preference settings.
Why this answer
Local preference controls YOUR outbound path — higher local-pref on routes learned via the primary link makes your edge prefer it for outbound. AS_PATH prepending influences the RETURN (inbound) path; MED suggests preference to the neighbor; prefix length is more specific routing.
Correct answer: B · Last reviewed 2026-11-05
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