Why ExpressRoute is Essential for Public Authorities
The public internet is not an option. Sensitive government data requires dedicated connections. An Azure ExpressRoute setup provides this security through private lines, guaranteed bandwidth, and low latency.
Cloud migration for the public sector demands reliable connectivity. A datacenter migration to Azure only works with a stable connection. ExpressRoute delivers both: security and performance.
What Azure ExpressRoute Offers
ExpressRoute is a private connection that completely bypasses the internet. Data flows over dedicated lines, with carrier partners providing the infrastructure.
For the public sector, this means the communication-security criteria of BSI C5 are easier to meet. The BSI-compliant cloud security concept can point to secure connectivity, strengthening KRITIS cloud security.
Understanding the Architecture
ExpressRoute Circuit — The circuit is the physical connection linking your data center to Microsoft. Various bandwidths are available, from 50 Mbps to 100 Gbps.
Peering Types — Private Peering connects to Azure VNets, while Microsoft Peering reaches Microsoft 365. Both can be used in parallel.
Redundancy — High availability requires redundancy. Two circuits at different locations ensure automatic failover in case of an outage, meeting government SLAs.
Quick Checklist: ExpressRoute Setup
| Step | Task | Responsible |
| 1 | Determine Bandwidth Needs | IT Department |
| 2 | Select Carrier Partner | Procurement |
| 3 | Order Circuit | Carrier |
| 4 | Configure Azure | Cloud Team |
| 5 | Set Up Routing | Network Team |
| 6 | Implement Redundancy | Cloud Team |
| 7 | Activate Monitoring | Operations |
To-Do List for Secure Connectivity
- Today: Analyse current bandwidth usage.
- This Week: Research carrier options.
- This Month: Create the ExpressRoute design.
- Quarter 1: Commission the circuit.
- Quarter 2: Start migration over ExpressRoute.
Mastering Hybrid Scenarios
Not everything moves to the cloud at once. Hybrid architectures are a reality. ExpressRoute connects both worlds, allowing on-premises and Azure to work together.
A VMware to Azure migration particularly benefits, as large data volumes are transferred quickly. Replication runs in the background, and the cutover occurs without significant downtime.
Security at All Levels
ExpressRoute is private by design, but it is not encrypted by default. Additional measures — MACsec on the circuit, IPsec tunnels over ExpressRoute, or application-level TLS — provide the encryption that BSI C5 and IT-Grundschutz expect even on dedicated lines.
IT-Grundschutz recommends defence in depth: ExpressRoute is one layer, complemented by firewalls, segmentation and identity-based access control.
Costs and Procurement
Azure ExpressRoute has two cost components: Microsoft charges for the circuit, and the carrier charges for the line. Both must be budgeted.
A cloud framework agreement can simplify procurement, and a cloud migration tender should include connectivity from the start so that total migration costs stay transparent.
Insight42 Connectivity Services
We plan and implement ExpressRoute, from needs analysis to operation, as part of our Azure migration consulting — and our managed services monitor the connection proactively for SLA-compliant operation. For multi-cloud environments see Multi-Cloud Connectivity: Combining ExpressRoute and Google Cloud Interconnect.
Connect securely. See Cloud Migration Beratung (German) or contact us.