Google Research

RSSAC047 - RSSAC Advisory on Metrics for the DNS Root Servers and the Root Server System

  • Russ Mundy
  • Duane Wessels
  • Alejandro Acosta
  • Jaap Akkerhuis
  • Fred Baker
  • Ray Bellis
  • Kazunori Fujiwara
  • Paul Hoffman
  • Kevin L. Jones
  • Akira Kato
  • Warren Kumari
  • Matt Larson
  • Daniel Migault
  • Ken Renard
  • Shinta Sato
  • Ryan Stephenson
  • Robert Story
  • Kevin Wright
  • Zhiwei Yan
Internet Corporation for Assigned Names and Numbers (ICANN) (2020), pp. 31


In this report, the RSSAC: • Defines measurements, metrics, and thresholds that root server operators (RSOs) meet to provide a minimum level of performance. The thresholds are based on technical metrics designed to assess the performance, availability, and quality of service that each root server identifier (RSI) provides. The thresholds and the metrics on which they are based are included as the RSSAC’s input to a yet-to-be defined evaluation process for future RSOs. • Defines system-wide, externally verifiable metrics and thresholds which demonstrate that the root server system (RSS) as a whole is online and serving correct and timely responses.

The metrics described in this report are based on the current awareness of, experience with, and understanding of the root servers and RSS. In the future, different metrics may be required to better understand the RSS and quantify performance, availability, and quality of service. As the metrics and this document are revised, current and future RSOs may have to adapt their architectures over time to meet the changing needs of the RSS.

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