Archana Kesavan of ThousandEyes speaking at NANOG75 reports that network traffic between AZs within a single region is generally “reliable and consistent,” and that tested cloud providers offer a “robust regional backbone for [suitable for] redundant, multi-AZ architectures.”
ThousandEyes ran tests at ten minute intervals over 30 days, testing bidirectional loss, latency, and jitter. Kesavan reported the average inter-AZ latency for each tested cloud:
| AWS | Azure | GCP |
|---|---|---|
| .82ms | 1.05ms | 0.79ms |
Within the four tested regions in AWS, they found:
| Region | Latency |
|---|---|
| us-east-1 | 0.92ms |
| ap-south-1 | 0.72ms |
| eu-west-2 | 0.61ms |
| sa-east-1 | 1.13ms |