---
title: Service Mesh Traffic Shifting: VPC Lattice, Istio on EKS, and App Mesh EOL
description: App Mesh is legacy path—new meshes should start with VPC Lattice for AWS-native east-west or Istio on EKS when you need full L7 policy. Traffic shifting without duplicating load balancers per service.
url: https://www.factualminds.com/blog/service-mesh-traffic-shifting-vpc-lattice-istio-eks/
datePublished: 2026-06-12T00:00:00.000Z
dateModified: 2026-06-12T00:00:00.000Z
author: Palaniappan P
category: DevOps & CI/CD
tags: engineering-guide, kubernetes, eks, service-mesh, aws
---

# Service Mesh Traffic Shifting: VPC Lattice, Istio on EKS, and App Mesh EOL

> App Mesh is legacy path—new meshes should start with VPC Lattice for AWS-native east-west or Istio on EKS when you need full L7 policy. Traffic shifting without duplicating load balancers per service.

**AWS App Mesh** is in maintenance/EOL trajectory—**June 2026** greenfield should evaluate **VPC Lattice** (service network across VPCs/accounts) and **Istio on EKS** for Kubernetes-native canary (flagger, Argo Rollouts).

## Traffic shifting patterns

| Tool                | Shift mechanism                |
| ------------------- | ------------------------------ |
| ECS/CodeDeploy      | Target group weights           |
| EKS + Istio         | VirtualService weights         |
| VPC Lattice         | Listener rules + target groups |
| ECS Service Connect | Simpler east-west for ECS-only |

**Sidecar limitations:** CPU/memory tax per pod—measure before meshing 200 microservices.

## Service discovery

**Cloud Map** + DNS for ECS; **CoreDNS** for EKS; Lattice provides **named services** without Consul cluster ops.

## What to do this week

1. Inventory App Mesh usage—plan Lattice or Istio migration.
2. Pilot 5% canary with weighted targets on non-critical API.
3. Compare p99 latency with/without sidecar on same node pool.

## What this guide doesn't cover

Container seccomp—part 4 of track.

---

*Source: https://www.factualminds.com/blog/service-mesh-traffic-shifting-vpc-lattice-istio-eks/*