Transit Gateway: Throughput with ECMP

VPN to Virtual Private Gateway (VGW)

• Single VPN connection (2 tunnels) → ~1.25 Gbps total.

VPN to Transit Gateway (TGW) with ECMP

• 1 VPN connection (2 tunnels in parallel) → ~2.5 Gbps.

• 2 VPN connections (4 tunnels total) → ~5.0 Gbps.

• 3 VPN connections (6 tunnels total) → ~7.5 Gbps.

Key Points

• ECMP with Transit Gateway allows bandwidth aggregation across multiple VPN connections.

• Scales throughput horizontally without requiring a larger single link.

• Pricing is per GB of processed data by Transit Gateway.

When to Use

• Need high-throughput VPN connectivity without moving to Direct Connect.

• Cost-conscious scaling for hybrid workloads where multiple tunnels are acceptable.