Advance Routing Policy in AWS Cloud WAN

AWS Cloud WAN is a managed wide-area networking (WAN) service from AWS. It lets you build, manage, and monitor a unified global network that spans both cloud and on-premises environments. In practice, Cloud WAN lets you connect your data centres, branch offices, remote sites, and AWS cloud resources (e.g. VPCs) through a central control plane — instead of manually wiring together many VPCs, VPNs, Transit Gateways, and third-party SD-WANs. To learn more about Cloud WAN, read my previous post on Connectivity using Cloud WAN . Recently, AWS has announced advanced routing feature for Cloud WAN. Let's explore Segment routing policy in this post. Let's assume, we have two segments -> DEVELOPMENT and PRODUCTION and we have the policy. { "core-network-configuration": { "vpn-ecmp-support": true, "asn-ranges": [ "64520-64524" ], "edge-locations": [ { "location": "us-west-2", "asn": 64521 }, { "location": "us-east-1", "asn": 64522 } ] }, "version": "2025.11", "attachment-policies": [ { "rule-numb