Using AS_PATH to Prefer Routes from Oracle to the On-premises Network

Oracle uses the shortest AS path when sending traffic to the on-premises network, regardless of which path was used to start the connection to Oracle.Therefore asymmetric routing is allowed. Asymmetric routing here means that Oracle’s response to a request can follow a different path than the request.

Oracle implements AS path prepending to establish preference on which path to use if the edge device advertises the same route and routing attributes over several different connection types between the on-premises network and VCN.

Oracle honors the complete AS path you send.

Reference

https://docs.oracle.com/en-us/iaas/Content/Network/Concepts/fastconnectoverview.htm