North American Network Operators Group
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Re: One-element vs two-element design

  • From: Petri Helenius
  • Date: Sun Jan 18 02:58:43 2004 
Eric Kuhnke wrote:


Last year, a Boeing in flight over the middle of the pacific ocean had its entire glass cockpit system go dark. After frantic conversation with the air traffic controllers a decision was made to toggle the circuit breakers for the TRIPLE-REDUNDANT computer system onboard, which brought back the displays. Even with a 2+1 setup, things can still go wrong...


Most, if not all, redundant systems have a single instance of synchronization protocol.
One significant vendor of packet forwarding gear was known for hanging the secondary
RP almost every time when the primary failed. The hang was usually associated with
chatter failing with the failed card :-)

Pete