Very much so. B4 can be run near 100% because of strict admission control and optimized routing to maximize the use of all paths. It's much harder to do that on

Very much so. B4 can be run near 100% because of strict admission control and optimized routing to maximize the use of all paths. It's much harder to do that on peering links where the traffic is bursty and you don't have control over the end-to-end latency and jitter. SDN isn't a magic pill for this, but it can most definitely lead to better performance and higher utilization than Ye Olde BGP Traffic Engineering.