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Costs

The simplicity of the telephone exchange protocol comes at a price:

  1. If a switch in the core crashes, the routing protocol doesn't know how to find an alternative path. Therefore, to make the system as a whole reliable, every switch must be reliable.
  2. Requiring every pair of switches to be connected by a one-hop logical trunk makes for a network that is expensive to create and to maintain.

An alternative would be to develop a network where sophisticated routing algorithms lower the requirements for connectivity by allowing the removal of some of the direct links.

 
 
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