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