From: johnsheahan@charter.net
Date: Thu Apr 28 2005 - 21:00:50 GMT-3
Thanks for the help!
On R1, the delay for 172.16.1.0/24 is 1000ms, the bandwidth is 10000kb.
The outgoing interface on R2 is the same.
The network 172.16.1.0/24 is actually the Loopback interface 0 on R3. This
interface shows delay=5000ms and the bandwidth= 8,000,000kb.
----- Original Message -----
From: "Paresh Khatri" <Paresh.Khatri@aapt.com.au>
To: "Sheahan, John" <John.Sheahan@priceline.com>; <ccielab@groupstudy.com>
Sent: Thursday, April 28, 2005 7:19 PM
Subject: RE: EIGRP Composite Metric Calculation
> Hi,
>
> What does the output of 'sh ip eigrp topology 172.16.1.0 255.255.255.0'
indicate as the bandwidth and delay on R1 ?
>
> Paresh.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Sheahan, John
> Sent: Friday, 29 April 2005 07:15 AM
> To: ccielab@groupstudy.com
> Subject: EIGRP Composite Metric Calculation
>
>
> 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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