Fast Down Detection

Fast down detection or sub-second link failure detection is needed in a modern networks. Network operators of modern networks require that they can detect failure in sub-second and react to either soft or hard failures as quickly as possible.

The following are the two categories of fast down detection.

1. Polling

One of the method […]

EIGRP Metric

EIGRP uses the following equation in computing its metric.

EIGRP metric = [K1 * bandwidth + (K2 * bandwidth)/256 – load) + K3 * delay]*[K5/(reliability + K4)]

By default, EIGRP’s K values are set to:

K1 and K3 = 1 K2, K4 and K5 = 0

Substituting K values yields to […]