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articles/expressroute/design-architecture-for-resiliency.md

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author: duongau
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ms.service: expressroute
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ms.topic: conceptual
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ms.date: 04/15/2024
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ms.date: 04/18/2024
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ms.author: duau
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ms.custom: ai-usage
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---
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### Disaster recovery and high availability recommendations
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#### Use VPN Gateway as a backup for ExpressRoute
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Microsoft recommends the use of site-to-site VPN as a failover when an ExpressRoute circuit becomes unavailable. ExpressRoute is designed for high availability and there's no single point of failure within the Microsoft network. However, there can be instances where an ExpressRoute circuit becomes unavailable due to various reasons such as regional service degradation or natural disasters. A site-to-site VPN can be configured as a secure failover path for ExpressRoute. If the ExpressRoute circuit becomes unavailable, the traffic is automatically route through the site-to-site VPN, ensuring that your connection to the Azure network remains. For more information, see [using site-to-site VPN as a backup for Azure ExpressRoute](use-s2s-vpn-as-backup-for-expressroute-privatepeering.md).
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> [!NOTE]
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> Using site-to-site VPN as a backup solution for ExpressRoute connectivity is not recommended when dealing with latency-sensitive, mission-critical, or bandwidth-intensive workloads. In such cases, it's advisable to design for disaster recovery with ExpressRoute multi-site resiliency to ensure maximum availability.
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#### Enable high availability and disaster recovery
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To maximize availability, both the customer and service provider segments on your ExpressRoute circuit should be architected for availability & resiliency. For Disaster Recovery, plan for scenarios such as regional service outages due to natural calamities. Implement a robust disaster recovery design for multiple circuits configured through different peering locations in different regions. To learn more, see: [Designing for disaster recovery](designing-for-disaster-recovery-with-expressroute-privatepeering.md).
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For disaster recovery planning, we recommend setting up ExpressRoute circuits in multiple peering locations and regions. ExpressRoute circuits can be created in the same metropolitan area or different metropolitan areas, and different service providers can be used for diverse paths through each circuit. Geo-redundant ExpressRoute circuits are utilized to create a robust backend network connectivity for disaster recovery. To learn more, see [Designing for high availability](designing-for-high-availability-with-expressroute.md).
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> [!NOTE]
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> Using site-to-site VPN as a backup solution for ExpressRoute connectivity is not recommended when dealing with latency-sensitive, mission-critical, or bandwidth-intensive workloads. In such cases, it's advisable to design for disaster recovery with ExpressRoute multi-site resiliency to ensure maximum availability.
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#### Virtual network peering for connectivity between virtual networks
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Virtual Network (VNet) Peering provides a more efficient and direct method, enabling Azure services to communicate across virtual networks without the need of a virtual network gateway, extra hops, or transit over the public internet. To establish connectivity between virtual networks, VNet peering should be implemented for the best performance possible. For more information, see [About Virtual Network Peering](../virtual-network/virtual-network-peering-overview.md) and [Manage VNet peering](../virtual-network/virtual-network-manage-peering.md).
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### Monitoring and alerting recommendations
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#### Configure monitoring & alerting for ExpressRoute circuits

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