OFICIAL AWS What's New

Amazon ECS Service Connect now supports Zone-Aware routing

What happened
Based on AWS What's New · Jul 23, 2026

Amazon ECS Service Connect now supports zone-aware routing to reduce cross-AZ data transfer costs and latency by prioritizing intra-zone service traffic, with automatic failover to maintain availability.

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Key points
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With this launch, ECS Service Connect preferentially routes requests to endpoints in the same AZ as the originating task while dynamically adjusting traffic weights as endpoints scale to maintain balanced load across target services.
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Previously, as customers distributed their applications across AZs for resiliency, service-to-service traffic led to significant cross-zone data transfer, requiring trade-offs between cost and resilience.
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Zone-aware routing eliminates this trade-off, and when local endpoints become unhealthy or fall below capacity thresholds, traffic automatically redistributes across healthy AZs to maintain availability without overloading any single zones.
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Zone-aware routing is enabled by default for all new and existing services and requires no additional infrastructure or application code changes.

Amazon Elastic Container Service (Amazon ECS) has introduced zone-aware routing for ECS Service Connect, allowing customers to minimize cross-AZ data transfer expenses and latency. The feature automatically directs service-to-service traffic to endpoints within the same Availability Zone (AZ) as the originating task, dynamically adjusting traffic weights to balance load. Previously, distributing applications across AZs for resilience incurred higher costs due to cross-zone traffic, forcing trade-offs between cost and availability. Zone-aware routing removes this compromise by optimizing traffic flow while preserving resilience.

The new routing behavior is enabled by default for all new and existing services, requiring no additional infrastructure or code changes. Existing services need only a one-time redeployment to adopt the feature. Amazon VPC Flow Logs with AZ metadata can be used to monitor traffic patterns and validate the effectiveness of the routing adjustments. This ensures customers can track performance improvements and confirm that traffic is being routed as intended across their deployed services.

Zone-aware routing automatically redistributes traffic to healthy AZs if local endpoints become unhealthy or fall below capacity thresholds, maintaining service availability without overloading any single zone. This failover mechanism ensures continuous operation even during localized disruptions, aligning with ECS Service Connect’s goal of simplifying service-to-service communication. The feature is designed to enhance operational efficiency while reducing unnecessary data transfer costs.

The feature is available at no additional cost in all AWS commercial and AWS GovCloud (US) Regions where ECS Service Connect is supported. Customers can refer to the official documentation and launch blog post for implementation details and best practices. This update reflects AWS’s ongoing efforts to improve cost predictability and performance for containerized workloads running on ECS.

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