CCNA Study Guide

This Blog highlights CCNA study materials for those pursuing the CCNA EXAM 640-801.It is a must read for those going for the exam and need last minute total recall.

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Wednesday, March 15, 2006


EIGRP provides a wide range for its metrics.
EIGRP uses a combination (vector) of metrics
- Bandwidth, delay, reliability, load .

EIGRP metric =
{(K1*Bandwidth) + [(K2*Bandwidth)/(256-load)] + (K3*Delay)} + K5/(Reliability+K4)]
Default K value : K1 =1, K2=0, K3=1, K4=0, K5=0

Default weightings (bandwidth, Delay) is used automatically to calculate optimal routes.
Network administrators can influence route selection .
Weighting factors for each metrics can set by network administrator.

•Administrative distance of EIGRP:
90 for internal routes
and 170 for external routes.

•IOS Command to make change to administrative distance.
distance 1 ~ 255


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