Network Topology in the Cloud — ToR

Top of Rack

[1] demonstrates that most of the topology in Amazon Cloud is ToR mode.
  • All servers in a track are first connected to a separate Top of Rack (ToR) switch, and then the ToR switch is connected to aggregate swtiches. 
  • Such a topology has currently become a mainstream network topology in a data center.


[1] A Measurement Study on Co-residence Threat inside the Cloud, by Zhang Xu, Haining Wang and Zhenyu Wu, in UsenixSecurity2016

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