Multi-Cloud Hub and Spoke
A global network architecture connecting AWS, Azure, and GCP via secure transit hubs and dedicated interconnects.
Architecture Topology
AWS Spoke
Global Transit Hub
(with NGFW)
Azure Spoke
Figure 1.0: Conceptual Architecture Blueprint
1. What problem does this solve?
Without a centralized transit architecture, multi-cloud networking devolves into a complex, unmanageable web of point-to-point VPNs leading to massive egress costs and security blind spots.
Why is the traditional approach broken?
Teams often rely on VPC Peering or unmanaged Site-to-Site VPNs. This creates an N*(N-1)/2 mesh scaling problem. Routing tables become unmanageable, and inspecting cross-cloud traffic for malicious activity becomes mathematically impossible without extreme latency.
2. How does MacroCloud solve it?
MacroCloud orchestrates a Global Transit Hub using AWS Transit Gateway and Azure Virtual WAN, bridged by dedicated layer-2 interconnects (e.g., Megaport/Equinix). All traffic routes through centralized Next-Generation Firewalls for deep packet inspection, ensuring strict boundaries between cloud perimeters.
3. Implementation Phases
This architecture is deployed via infrastructure-as-code following this exact sequence:
4. Operational Considerations & Risks
Operations
- BGP routing table management
- Firewall threat signature updates
- Monitoring Interconnect bandwidth utilization
Risks
- Single point of failure if the Hub is not deployed across Availability Zones
- Asymmetric routing issues if BGP metrics are misconfigured
- High data transfer costs if traffic isn't optimized
Business Outcomes
- Elimination of the N-squared peering problem
- 100% visibility into East-West cross-cloud traffic
- Significantly lower egress latency and fees
Core Components
- AWS Transit Gateway / Azure Virtual WAN
- Megaport / Equinix Fabric Interconnect
- Palo Alto / Fortinet NGFW VMs
- BGP Dynamic Routing