Objective

Multi-AZ (Multiple Availability Zones) is an architecture strategy where your resources and network connections are distributed across two or more physically separated data centres (Availability Zones) within a region. This protects against the failure of a single site.

Why Multi-AZ matters for OVHcloud Connect

A single OVHcloud Connect link through a single PoP is a single point of failure. If that PoP, the cross-connect, or the physical link experiences an outage, your private connectivity is lost.

Multi-AZ designs address this by establishing redundant connections through different PoPs or Availability Zones, so that traffic can automatically reroute if one path fails.

Architecture overview

How Multi-AZ works with OVHcloud Connect

1. Order two OVHcloud Connect services in two different PoPs.
2. Configure BGP on both links with appropriate route priorities (using BGP attributes like Local Preference, MED, or AS-path prepending) so that traffic prefers one path but can fall back to the other.
3. Distribute your OVHcloud resources across multiple Availability Zones within the same region.
4. Test failover by simulating a link outage and verifying that traffic switches to the backup path.

Multi-AZ and BGP configuration

For automatic failover, your BGP configuration must distinguish between the primary and backup paths. Common approaches:

• Local Preference — Set a higher Local Preference on routes learned from the primary link.
• AS-path prepending — Make the backup path's AS-path longer so it is less preferred.
• MED (Multi-Exit Discriminator) — Use MED values to influence inbound routing from OVHcloud.

See Configure OCC L3 with BGP for detailed configuration guidance.

When to use Multi-AZ

What's next?

• Learn about SLAs and how Multi-AZ affects your uptime guarantees.
• See the AZ configuration guide to set up subnets across zones.
• Explore resilient architecture tutorials for step-by-step examples.

Go further

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