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Two Tier 1 networks strip RFC 9234 OTC attributes from forwarded BGP routes
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RFC 9234 uses BGP Roles and the Only to Customer attribute to let routers automatically reject route leaks, and Cloudflare's measurement of its adoption found two Tier 1 networks unexpectedly stripping the attribute.
Stripping the OTC attribute breaks the protocol's automatic route leak prevention for downstream networks receiving those routes. Cloudflare is engaging with these Tier 1s to restore OTC propagation so early adopters can actually benefit from the protection.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
RFC 9234 moves route leak prevention into the BGP protocol itself using BGP Roles and the Only to Customer attribute.
Cloudflare measured adoption by tracking which peer Autonomous Systems send the OTC attribute to its network.
Two large Tier 1 networks were found stripping the OTC attribute from routes they forward.
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