Transit Gateway: Site-to-Site VPN with ECMP

ECMP (Equal-Cost Multi-Path Routing)

• Allows traffic to be load-balanced across multiple routing paths that have the same cost.

• Each path is treated as equally preferred, enabling parallel usage.

Use Case with Transit Gateway

• Create multiple Site-to-Site VPN connections between your on-premises network and AWS Transit Gateway.

• Benefits:
• Aggregate bandwidth from multiple tunnels for higher throughput.
• Fault tolerance – if one tunnel fails, others continue handling traffic.
• Improved performance for high-volume workloads.