The Deployment of Routing Protocols in Distributed Control Plane of SDN

Algorithm 1

Steps of the process of BGP route selection.

(0) Ignore if egress router unreachable

(1) Highest local preference

(2) Lowest AS path length

(3) Lowest origin type

(4) Lowest MED

(5) eBGP-learned over iBGP-learned

(6) Lowest IGP path cost to egress router

(7) Lowest router ID of BGP speaker