Optimizing EIGRP Convergence
The previous major section of this chapter focused on how EIGRP calculates metrics and how to change that metric calculation. However, that section discussed only one motivation for changing the metric: to make a router pick one route instead of another. This section, which focuses on optimizing the EIGRP convergence process, discusses another reason for choosing to manipulate the EIGRP metric calculations: faster convergence.
EIGRP converges very quickly, but EIGRP does not achieve the most optimal fast convergence times in all conditions. One design goal might be to tune EIGRP configuration settings so that EIGRP uses faster convergence methods for as many routes as possible, and when not possible, that EIGRP converge ...
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