Cascara

Cascara is a cloud edge traffic engineering (TE) framework that optimizes the cost of inter-domain bandwidth allocations with non-linear pricing schemes. Cascara leverages the abundance of latency-equivalent peer links on the cloud edge to minimize costs without impacting client latency significantly.

Cost-effective cloud edge traffic engineering with Cascara, NSDI 2021
Rachee Singh, Sharad Agarwal, Matt Calder, Victor Bahl