3.5.c Implement and troubleshoot loop free path selection

3.5.c [iii] Wide metric

To this, there are two additional values being added: jitter and energy. These two new values are accumulated from destination to source:



These extended attributes, as well as any future ones , will be controlled through K6. If K6 is non-zero, these will be an additive to the path’s composite metric. Higher jitter or higher energy usage will result in paths which are worse than those paths that either do not monitor these attributes, or which have lower values. EIGRP will not send these attributes if the router does not provide them. If the attributes are received, then EIGRP will use them in the metric calculation (based on K6) and will forward them with that router’s values, assumed to be “zero”, and the accumulative values will be forwarded unchanged. Of these vector metric components, by default, only minimum throughput and latency are traditionally used to compute the best path. Unlike most metrics, minimum throughput is set to the minimum value of the entire path, and it does not reflect how many hops or low throughput links are in the path, nor does it reflect the availability of parallel links. Latency is calculated based on one-way delays, and is a cumulative value, which increases with each segment in the path.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 3127-3138).  . Kindle Edition.