EIGRP metric manipulation

Unanswered Question
Mar 10th, 2009

I have situation where I need to manipulate EIGRP metric BW and delay such a way that after change, composite metric remains same. For example I have BW of 512 and delay of 1000 on interface which turn out composite metric of 40870400/2306560. Now I need to increase BW from 512 to 1024 while decreasing delay by certain value so that I can still maintain the same metric. Is there any ratio someone can tell me considering I am using default k values of 1 for both BW and delay?

I have this problem too.
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Giuseppe Larosa Tue, 03/10/2009 - 13:54

Hello Yagnesh,

be aware that EIGRP metric is cumulative on delay but it is inverse proportionale to the smallest BW on the path

the components are:

256 * (sum of delays in 10s of microseconds)

where 10 msec are 10000 microsec and so 1000 tens of microseconds


bw component is the inverse of the smallest BW in the path in kbps example if BW is 2048 kbps

256 * 10^7 / 2048 = 1250000

so you understand that if it is quite difficult to achieve what are you looking for

May I ask you why you would like to increase bandwidth ?

be aware that there is also the interface command

ip bandwidth-percent eigrp as-number percent

that can be used to increase the rate of EIGRP updates

Hope to help



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