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Add ZoneAwareLB settings for MeshConfig and DestinationRule #3733

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Merged
istio-testing merged 3 commits into from
Jul 15, 2026
Merged

Add ZoneAwareLB settings for MeshConfig and DestinationRule #3733

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97dd888
add zone aware lb settings
sschepens May 28, 2026
ff807f8
Merge remote-tracking branch 'upstream/master' into zone-aware-routing
sschepens Jul 13, 2026
8d2f811
improve docs
sschepens Jul 13, 2026
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429 changes: 429 additions & 0 deletions kubernetes/customresourcedefinitions.gen.yaml
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224 changes: 122 additions & 102 deletions mesh/v1alpha1/config.pb.go
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13 changes: 12 additions & 1 deletion mesh/v1alpha1/config.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -345,10 +345,21 @@ message MeshConfig {

// Locality based load balancing distribution or failover settings.
// If unspecified, locality based load balancing will be enabled by default.
// However, this requires outlierDetection to actually take effect for a particular
// Only one of locality_lb_setting and zone_aware_lb_setting should be enabled;
// if both are set, zone_aware_lb_setting takes precedence and this setting is ignored.
// Failover settings, require outlierDetection to actually take effect for a particular

@keithmattix keithmattix Jul 15, 2026

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Suggested change
// Failover settings, require outlierDetection to actually take effect for a particular
// Failover settings require outlierDetection to actually take effect for a particular

// service, see https://istio.io/latest/docs/tasks/traffic-management/locality-load-balancing/failover/
istio.networking.v1alpha3.LocalityLoadBalancerSetting locality_lb_setting = 35;

// Zone Aware based load balancing settings.
// Only one of locality_lb_setting and zone_aware_lb_setting should be enabled,
// if unspecified zone_aware_lb_setting is disabled by default.
// If both are set, zone_aware_lb_setting takes precedence over locality_lb_setting.
// Additionally, Zone Aware LB is only supported in Sidecar mode and only takes effect
// on proxies configured with `ISTIO_META_ENABLE_SELF_DISCOVERY=true` (via `proxyMetadata`); see
// [ZoneAwareLoadBalancerSetting](https://istio.io/latest/docs/reference/config/networking/destination-rule/#ZoneAwareLoadBalancerSetting).
istio.networking.v1alpha3.ZoneAwareLoadBalancerSetting zone_aware_lb_setting = 73;

// Configures DNS refresh rate for Envoy clusters of type `STRICT_DNS`
// Default refresh rate is `60s`.
google.protobuf.Duration dns_refresh_rate = 36;
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19 changes: 18 additions & 1 deletion mesh/v1alpha1/istio.mesh.v1alpha1.pb.html
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99 changes: 99 additions & 0 deletions networking/v1/destination_rule_alias.gen.go
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