How to use destinationrule loadblancer simple PASSTHROUGH

[hxpistio]

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: productpage
spec:
  host: productpage.istio.svc.cluster.local
  subsets:
  - name: v1
    labels:
      version: v1
  trafficPolicy:
    loadBalancer:
      simple: PASSTHROUGH

result is no healthy upstream