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In an STP network which is a result of a poorly placed root bridge?
Instability in the Root Bridge election.
STP cannot be resolved quickly.
STP topology can take unpredicted paths.
A bridging loop may occur.
STP topology cannot be converged.
STP has a predictable mechanism and will always converge correctly as long as some factors are considered before design. To optimize the mechanism of the STP is important to make adjustments to control STPs behavior. The most important factor for design should be the location of the root bridge. If a root bridge is left to its default state, it could place it in an unexpected location in the network, resulting in unpredicted traffic flows. Please understand this question is from an enterprise perspective. For more information, review this discussion: https://supportforums.cisco.com/t5/lan-switching-and-routing/root-bridge-placement/td-p/1887405
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