Hybrid connectivity ensures secure, reliable communication between on-premises data centers and AWS for SAP workloads. The design leverages AWS Direct Connect (DX) as the primary high-performance link and Site-to-Site VPN (S2S VPN) as a backup. All connectivity integrates through the Transit Gateway to simplify routing across multiple accounts and environments.
Key benefits:
- High bandwidth and low latency for production SAP workloads.
- Automatic failover via VPN to ensure business continuity.
- Centralized routing using Transit Gateway for simplified multi-account management.
- Establish secure, reliable hybrid connectivity between on-premises SAP infrastructure and AWS to support:
- Production SAP workloads with minimal latency.
- Backup connectivity in case of primary link failure.
- Centralized, scalable routing to all AWS accounts via Transit Gateway.
Design Overview
| Connection Type | Purpose | Notes |
|---|---|---|
| Direct Connect | High bandwidth, low latency | Primary link for production SAP traffic |
| Site-to-Site VPN | Failover / backup | Automatically routes traffic if DX fails |
| Transit Gateway | Centralized routing | Connects all AWS accounts to on-prem |
All SAP workload VPCs connect to the Transit Gateway in the Network Service account.
BGP is used for dynamic routing and redundancy.
Optional redundant DX connections at different locations increase resilience.
BGP is used for dynamic routing and redundancy.
Optional redundant DX connections at different locations increase resilience.
Technical Steps for Hybrid Connectivity
Step 1: Set Up AWS Direct Connect (Primary)
Log in to Network Service Account.
Navigate to Direct Connect → Create Connection:
- Location: nearest DX site to on-prem
- Port speed: 1 Gbps or higher
- Connection name: e.g.,
SAP-Prod-DX
Configure BGP ASN for routing with on-prem.
Attach VIF to Transit Gateway for all account connectivity.
Step 2: Configure Site-to-Site VPN (Backup)
- Navigate to VPC → Site-to-Site VPN → Create VPN Connection.
- Attach VPN to Transit Gateway.
- Enable BGP routing for automatic failover.
- Test VPN connectivity to ensure proper routing if DX fails.
Step 3: Transit Gateway Routing
TGW acts as a hub connecting:
- All workload VPCs (Prod, Dev, QA, Sandbox)
- Shared Services, Security, and Logging VPCs
- On-premises via DX and VPN
- Update route tables in each VPC to send on-prem traffic to Transit Gateway.
Step 4: Redundancy and Monitoring
- Enable CloudWatch monitoring on DX connection.
- Configure BGP failover for VPN when DX is unavailable.
- Optionally deploy secondary DX connections in another location for additional resilience.
Diagram – Hybrid Connectivity
Transit Gateway (TGW)
- Centralizes routing between AWS accounts and on-premises network
- Simplifies multi-VPC and multi-region connectivity
On-Prem Connectivity
- Direct Connect: Primary, low-latency, high-bandwidth link
- Site-to-Site VPN: Backup/failover connectivity
Workload VPCs
- Prod, Dev, QA, Sandbox each in dedicated CIDR
- Private subnets host SAP workloads and connect via TGW to on-prem
Shared Services, Security, Logging VPCs
- Centralized services for CI/CD, monitoring, auditing, and security
- Connected via TGW for all AWS workloads
Notes and Best Practices
- Ensures low-latency, high-bandwidth connectivity for SAP workloads.
- Backup VPN provides business continuity if DX fails.
- Transit Gateway reduces complex peering management across accounts and VPCs.
- BGP dynamic routing ensures automatic failover and redundancy.
- Monitor DX and VPN using CloudWatch to detect issues early.
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