EIGRP metric manipulation

[yagnesh_tel]

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?

[Giuseppe Larosa]

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

Giuseppe