An enterprise uses a BGP confederation composed of sub-AS 65010 and 65011. When routes from inside the confederation are advertised to an external eBGP neighbor, what will that external neighbor see in the AS path?

When routes from a BGP confederation are advertised to an external eBGP neighbor, the confederation is presented as a single, logical AS. The external neighbor will only see the confederation ID (the parent AS number) in the AS path, not the individual sub-AS numbers (65010 and 65011 in this case). This abstraction simplifies the routing table for external peers and prevents the sub-AS numbers from being visible outside the confederation. The external neighbor will not see all internal sub-AS numbers, nor will it see 'confed' markers, as these are internal to the confederation. AS path information is always included in BGP updates; it is not removed.