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IP Routing Primer by Robert Wright

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IGRP Routing Metrics (Variables) and Cisco Administrative Distances

This section covers two of the five possible variables of IGRP (Interior Gateway Routing Protocol) routing metrics— bandwidth and delay. It explains why only two are used and why it is usually best to accept the defaults for these two variables based on the type of link in use and its speed. It also discusses the concept of administrative distances.

IGRP Metrics (Variables)

IGRP can be configured to take the following variables into account when determining which routes to use:

  • Bandwidth: This is a measure of the speed of the physical network connected to an interface. A 64K serial connection has a bandwidth of 64,000 bits per second. Cisco uses a factor of 1000 in the bandwidth ...

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