To enable successful route exchanges between eBGP neighbors who share the same AS number, two important BGP features are 'as-override' and 'allow-as-in'. 'As-override' is used by service providers to change the AS number in the AS path, preventing route rejection due to loop prevention mechanisms. 'Allow-as-in' permits the AS number to be present in the AS path multiple times, which is necessary when routes are being reused within the same AS. Together, these features facilitate route exchanges in scenarios where eBGP peers share an identical AS number.