Amazon ECS Service Connect adds zone-aware routing
Amazon ECS Service Connect now supports zone-aware routing, automatically prioritizing service-to-service traffic within the same Availability Zone to reduce cross-AZ data transfer costs and latency. This feature benefits customers deploying applications across multiple AZs for resiliency by eliminating the trade-off between cost and resilience. Zone-aware routing is enabled by default for new services and requires a one-time redeployment for existing services, with availability across all supported AWS regions.
- →Introduce zone-aware routing for ECS Service Connect
- →Improve resiliency and cost efficiency for distributed applications
- →Zone-aware routing is enabled by default and requires minimal configuration
- →Monitor cross-AZ traffic with VPC Flow Logs
- →Feature available in all supported AWS regions at no additional cost
Features (1) ›
- Introduce zone-aware routing for ECS Service Connect
ECS Service Connect now prioritizes service-to-service traffic within the same Availability Zone to reduce cross-AZ data transfer costs and latency. The feature dynamically adjusts traffic weights as endpoints scale to maintain balanced load across target services.
Enhancements (1) ›
- Improve resiliency and cost efficiency for distributed applications
Zone-aware routing eliminates the need to trade off between cost and resilience for applications distributed across multiple Availability Zones. Traffic automatically redistributes across healthy AZs to maintain availability without overloading any single zone when local endpoints are unhealthy or below capacity.
Notes (3) ›
- Zone-aware routing is enabled by default and requires minimal configuration
The feature is enabled by default for all new and existing ECS Service Connect services, requiring no additional infrastructure or application code changes. Existing services must be redeployed once to enable the new routing behavior.
- Monitor cross-AZ traffic with VPC Flow Logs
Users can leverage Amazon VPC Flow Logs with Availability Zone metadata to monitor cross-AZ traffic patterns and validate the effectiveness of the new routing.
- Feature available in all supported AWS regions at no additional cost
Zone-aware routing is available in all AWS commercial and AWS GovCloud (US) Regions where ECS Service Connect is supported. This feature is provided at no additional cost.
https://aws.amazon.com/about-aws/whats-new/2026/07/ecs-service-connect-zone-aware/
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