Extending SD-WAN Segmentation into AWS Cloud WAN – Part 1

This article explains how to extend SD-WAN network segmentation into AWS Cloud WAN using virtual appliances, focusing on Model 1: Multiple GRE-based Connect attachments over a single network interface.

• Deploy SD-WAN virtual appliances directly in AWS instead of on-premises for scalability and flexibility
• Map SD-WAN VRF instances to AWS Cloud WAN segments for end-to-end network isolation
• Use GRE tunnels with Connect attachments to maintain strict segmentation across hybrid environments
• Each GRE tunnel supports up to 5 Gbps; four peers per attachment enable 20 Gbps total bandwidth
• Configure BGP peering between SD-WAN appliance and AWS Cloud WAN for dynamic routing
• Requires Inside CIDR blocks, attachment policies, VPC attachment, and Connect peer configuration
• Part 2 covers Tunnel-less Connect with Multi-VPC ENI for higher bandwidth without encapsulation

This approach enables enterprises to maintain strict network segmentation for compliance and multi-tenant environments while leveraging AWS global infrastructure and cloud-native deployment models.