When you configure the metric rib-scale command, all EIGRP routes in the RIB are cleared and
replaced with the new metric values.
The 64-bit metric calculations work only in EIGRP named mode configurations. EIGRP classic mode
uses 32-bit metric calculations.
Note
To accommodate interfaces with bandwidths above 1 gigabit and up to 4.2 terabits and to allow EIGRP to
perform path selections, the EIGRP composite cost metric formula is modified. The paths are selected based
on the computed time. The time that information takes to travel through links is measured in picoseconds.
The interfaces can be directly capable of these high speeds, or the interfaces can be bundles of links with an
aggregate bandwidth greater than 1 gigabit.
Metric = [(K1*Minimum Throughput + {K2*Minimum Throughput} / 256-Load) + (K3*Total Latency) +
(K6*Extended Attributes)]* [K5/(K4 + Reliability)]
Default K values are as follows:
K1 = K3 = 1
K2 = K4 = K5 = 0
K6 = 0
The EIGRP Wide Metrics feature also introduces K6 as an additional K value for future use
从某些思科官网文档可以看到eigrp支持6个K值去计算metric。可以在命名的eigrp中实现扩展的eigrp metric，即router eigrp Ender这种配置模式实现
本文转自EnderJoe 51CTO博客，原文链接:http://blog.51cto.com/enderjoe/1421221
