Since the beginning of March, RPKI-based origin validation is deployed at all DE-CIX route servers. But RPKI-based origin validation is not the only filtering mechanism at the DE-CIX route servers.
At DE-CIX, the route servers always filter based on AS-path as well as IP prefixes. The filtering mechanisms that can be used to filter BGP announcements are described in detail in the DE-CIX route server guides.
The BGP announcements that a route server receives from a peer are checked against the AS-SET the peer has provided. The AS-SET can be changed by contacting the DE-CIX Customer Service team.