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Interconnection between active-active data centers

Active-active data centers are interconnected using high-speed, low-latency private networks that enable simultaneous operation, workload mobility, and seamless failover across geographically distributed sites.

Overview of Active-

Active Data CentersActive-active data centers are designed to operate simultaneously, with both sites actively processing workloads and serving users. This configuration ensures high availability, disaster resilience, and load balancing, as traffic and applications can be distributed across multiple locations without downtime. Unlike active-passive setups, active-active architectures require synchronized data and consistent IP addressing to allow seamless application operation across sites.

Key Interconnection Technologies

Data Center Interconnect (DCI) DCI provides private, dedicated connectivity between data centers, enabling them to function as a unified environment. It supports low-latency, high-bandwidth communication for database replication, live workload migration, and distributed applications.

DC

I can use technologies such as dark fiber, wavelength services, Ethernet circuits, or MPLS networks, ensuring predictable performance and enhanced security compared to public internet connections. SDN-Based Fabric with EVPN/VXLAN Modern active-active designs often leverage Software-Defined Networking (SDN) with EVPN/VXLAN overlays. This allows the extension of the same IP subnet across multiple data centers, enabling workload mobility without IP renumbering.

Applications can operate in active-active mode, and servers can be migrated seamlessly between sites while maintaining connectivity for end users.

WA

N Connectivity Options Interconnection typically relies on MPLS-based WAN links for enterprise-grade reliability. Alternatively, IPsec tunnels over the public internet can be used when cost or availability constraints exist, though this may introduce higher latency and require additional security considerations.

Design Considerations

Latency and Bandwidth: Active-active operations require low-latency links to maintain data consistency and application performance. Bandwidth must be sufficient to handle replication and inter-site traffic. Data Synchronization: Databases and storage systems must be synchronized in real-time or near real-time to prevent data conflicts.

SAN or NA

S extensions may be used for storage replication. Path Optimization: When extending VLANs or IP subnets across sites, routing paths must be optimized to reduce latency and ensure efficient server-to-server communication. Redundancy and Failover: Interconnected data centers provide automatic failover in case of hardware or network failures, ensuring continuous operations for mission-critical applications.

Benefits of Interconnected Active-

Active Data Centers

High Availability: Continuous service even during outages at one site. Disaster Recovery: Geographic diversity protects against regional failures. Workload Mobility: Applications and virtual machines can move seamlessly between sites.

Improved Performance: Reduced latency for end users through optimized routing and distributed workloads. Security: Private interconnects reduce exposure to internet-based threats. In summary, active-active data centers rely on robust interconnection strategies combining DCI, SDN fabrics, and optimized WAN links to provide seamless, resilient, and high-performance operations across multiple locations.

Proper design ensures synchronized workloads, low-latency communication, and continuous availability for critical applications.

Interconnection between active-active data centers
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