Native Solutions
| CSP | Transit Solution | Limitations |
|---|---|---|
| AWS | AWS Transit Gateway | Lack of visibility No peering within region No security controls Limited BGP support |
| Azure | Via ExpressRoute Edge Router | Lack of visibility Lack of control Noisy neighbours |
| Azure | Azure Firewall | Lack of visibility Requires NAT and load balancer |
| Azure | Virtual WAN | Lack of visibility Lack of control Limited to 200 BGP routes to on-prem Cost |
| Google Cloud | None | No native transit solutions Single global VPC |
| OCI | Limited | No native east-west and north-south transit solution Promotes third party appliances |
Third-Party Solutions
- Legacy hardware vendors (e.g. Cisco etc.)
- Manual setup/management
- Not fully cloud aware—e.g. no IaC
- Large blast radius