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From: dupont@inria.inria.fr (Francis Dupont)
Newsgroups: comp.dcom.sys.cisco
Subject: delay of an interface
Keywords: delay, IGRP, metric
Message-ID: <1922@inria.inria.fr>
Date: 20 Mar 91 22:38:16 GMT
Organization: INRIA, Rocquencourt, France.
Lines: 14


An important component of IGRP metrics is the "delay".
Cisco manuals don't explain how to choice the delay of an interface
(the defaults are 1000us for Ethernet and 20000us for Serial).
How do you compute a delay ? The transit time for one bit is
to much bound to bandwidth ... Perhaps the transit time of the first
bit (for instance (RTT(200B)-2*RTT(100B))/8*100) is a good approximation
of delay ?

Francis.Dupont@inria.fr

PS : default formula for IGRP metric is :

10000*Bandwidth+Delay/10 with Bandwidth in kb/s and Delay in us