NOVEMBER 14, 2022

OneWAN Traffic Engineering: Unifying Inter-Datacenter and Internet Backbones

Like other large cloud providers, Microsoft operates two planet-scale wide-area networks: AS8075 WAN for Internet traffic and AS8074 software-defined WAN to carry inter-datacenter traffic. Maintaining two networks has operational challenges and so we consolidated the split-WAN architecture into a unified OneWAN using SDN principles (used in Swan). OneWAN grappled with the scaling challenges posed by network and routing table sizes 10 times larger than Swan. In addition, Internet Traffic Engineering (ITE) is another SDN system that enables performance-aware egress peer selection and inbound traffic engineering between autonomous systems. Together, OneWAN and ITE controllers measure peering traffic and adapt the backbone and the peering edge to dynamic demand spikes and capacity reductions.

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