Threats to Internet Routing and Global Connectivity, 20th Annual FIRST Conference, Vancouver, British Columbia Canada, June 2008 (69 page presentation) includes discussion of the following topics:

• Physical problems (Physical Infrastructure: Natural, accidental or intentional destruction)
  Earthquakes, Anchors/Backhoes, Hurricanes
• Routing Vulnerabilities (Logical Infrastructure: if routers cannot direct traffic appropriately, the Internet is broken.)
  Misconfigurations, hijacks, attacks
• Business Conflicts (Competitors might not want to exchange traffic.)
  De-peerings
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