Diversity in Azure Connections
Diverse connections improve the robustness of your network by using different physical infrastructure to provide network services. Diverse connections build in redundancy and eliminate single points of failure. A redundant connectivity configuration is a requirement for the Azure SLA to be valid.
Azure ExpressRoute and Megaport simplify the deployment of diverse connections by establishing multiple Ports within each metro area. Each Port is physically separated on Megaport edge devices and connected to diverse Azure devices. During Megaport scheduled maintenance, no more than one Port within a data center will experience downtime at any moment. Whenever possible, diverse services have maintenance periods scheduled for different days.
Each Azure port indicates its zone with either a “Primary” or “Secondary” in the Megaport Portal.
To create diverse connections, you need to create two connections by reusing the service key: one connection for each Azure port. This figure demonstrates the approach of using VXCs to diverse Azure ExpressRoute ports.
This figure shows a redundant solution with VXCs from different physical locations using diverse ports.
Azure Paired Regions - HA Design
Azure ExpressRoute - Redundancy