21. How can the edge routers estimate APN ID and parameters (latency, bandwidth, etc.) just from 5-tuple? Is there any interface or API between application and APN domain controller? From: Takuya Miyasaka

[APN-Github]

The edge routers will perform based on the configurations which indicates the matching relationship between the 5-tuple and the APN ID and/or parameters. The configurations could be enforced by the APN domain controller, which may be based on the agreements established between the services and the network operators, as illustrated in https://datatracker.ietf.org/doc/html/draft-li-apn-framework-04#section-6.