Internet Outage Trends Sean Donelan Equinix Inc NANOG 21 Atlanta, Georgia.

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Presentation transcript:

Internet Outage Trends Sean Donelan Equinix Inc NANOG 21 Atlanta, Georgia

What are the questions?  Was there any difference between Internet disruptions in 1999 and after Y2K?  Is the trend changing?  What really causes problems on the Internet?  What are fiber carriers and excavators doing to defend against the backhoe threat?

Methodology  Reviewed multiple sources –NANOG archives –Newspaper archives –Web searches –Personal archives  Identified unique outages (dedup multiple reports about the same event)  Did not identify root cause or carrier at fault  “Significant” – I know it when I see it

Year to Year comparison

Sample Events  Sep – Rochelle Park CO flooded  Sep – backhoe cuts gas line and fiber shared by multiple providers in Ohio  Nov – DCS failure, power outages, multiple fiber cuts on east and west coasts  May – Corrupt AS path crashes routers  Sep – Alternate fiber cut while primary circuit off-line for S.F. Bay Bridge repairs

Summary  119 significant disruptions in 1999  93 significant disruptions in 2000  Compared to FCC Telco reporting –170 outages reported for 7/1/98-6/30/99 –172 outages reported for 7/1/99-6/30/00  A dip during January and February 2000 compared to 1999

What are Diggers doing?  Database of excavators who routinely fail to notify One-Call centers  Free cellular call #DIG  Dig Safely and Common Ground Alliance  Improved ticket parsing and dispatching  New locating technology

DrillCheck  Courtesy: AT&T

Dig Safely

Internet Statistics?  Internet reliability publicly measured by end- to-end connections  Effects of congestion are included in Internet measurements (busy signals)  Some backbones report 100% availability  End-to-end reachability exceeds 97%  60% of Internet problems are repaired in less than 30 minutes

What causes problems?  Analysis of Internet “outages” –Maintenance (16.2%) –Loss of power (16%) –Fiber cuts (15.3%) –Hardware failure (9%) –Routing error (6.1%) –Congestion (4.6%) –Malicious attack (1.5%) –Software bug (1.3%) Courtesy: Internet Performance Measurement and Analysis Project University of Michigan

Original Concept  Paul Baran; On Distributed Communications: 1. Introduction to Distributed Communications Network (1964)On Distributed Communications: 1. Introduction to Distributed Communications Network

Questions? Sean Donelan Equinix Inc