From: Sheahan, John (John.Sheahan@priceline.com)
Date: Thu Apr 28 2005 - 18:14:47 GMT-3
I am trying to manually calculate the EIGRP Composite metric in a basic
lab setup. My numbers aren't coming out to what the book says. I have
three routers connected in togther in a row with the ethernet ports as
follows:
R1----------R2-----------R3
R3 has a loopback address of 172.16.1.0/24.
I notice that when I do a "show ip route 172.16.1.0" on R1, I see the
reliability to this route as 131/255 and a metric of 435200 to that
route.
When I try and do the calculation for the composite metric (CM), I am
getting the wrong answer and was wondering if I have to include the
reliability (131/255) into my calculation?
The formula I am using is:
DELAY_sum = The sum of the delay on outgoing interfaces only to the
destination route 172.16.1.0/24
BW_min = 10 to the 7th power divided by the smallest bandwidth to the
destination route 172.16.1.0/24
CM = (256 x BW_min) + (256 x DELAY_sum)
My calculations would be:
CM = (256 x 10000) + (256 x 7000)
CM = 4,352,000 which is off by one zero based on the metric of 435200
reported by the R1 router.
Can anyone give me a hint as to what I'm doing wrong?
Thanks!
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