Create BGP Routing Tables for Ra and Rb

→ Shortest paths only, we count only ASes, not Routers

For example, Ra can go to AS4 over Ra→R2→R3→R4 and over Ra→Rb→R5→R4, but the second way will be saved because it use 1 AS for transit and not 2 ASes.

All received BGP UPDATE of Ra and Rb will be sent to in SDN Controller. Is it reactive or proactive flow programming?

This a reactive Flow Programming, because this informations were not predefined before.

ML: proactive

Name all SDN interfaces and assign them to the I1-I6

Northbound API - I6 - interface between app and controller

Southbound API - I2, I3, I4 - interface between controller and SDN switches

Eastbound API - I1, I5 - interface to legacy equipment

All not-SDN technologies (like BGP routers) will be considered as legacy equipment

Not here: Westbound API - another SDN switches