From: Gregory Gombas (ggombas@gmail.com)
Date: Sun Aug 12 2007 - 11:07:27 ART
Yup, and if you take my calculation:
256((10,000,000/BW)) + (Delay/10))
And you apply directly to the bandwidth and delay values shown in
topology table you will get the same metric.
On 8/12/07, Bit Gossip <bit.gossip@chello.nl> wrote:
> On my opinion there is a mistake in the metric explanation from this link:
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hirp_r/
> rte_eih.htm#wp1000111
>
> Where it says: "Delay is in units of 10 microseconds"
> should be something like that: Delay Eigrp = "Sum of all delay accross the
> path SCALED BY 256"
>
> Forgetting to multiply it by 256 leads to a wrong calculation. I have verified
> instead that if I scale the delay I get exactly the same number shown in 'show
> ip eigrp topology'
>
> Thanks,
> Bit.
>
>
>
> -----Original Message-----
> From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
> Gregory Gombas
> Sent: Monday, August 06, 2007 7:10 PM
> To: Group study
> Subject: EIGRP metric calculation demystified
>
> Cisco documentation shows the EIGRP metric calculation as this:
> metric = [K1*bandwidth + (K2*bandwidth)/(256 - load) + K3*delay] *
> [K5/(reliability + K4)]
>
> Popular literature says it breaks down to this:
> 256(BW + Delay)
>
> In reality the calculation is this:
> 256((10,000,000/BW)) + (Delay/10))
>
> Does anyone know if this final formula can be found on the DOC cd?
>
> The closes match I could find was on WARP:
> http://www.cisco.com/warp/public/103/3.html
>
> But can this handy formula be accessed from the lab? Its kind of a
> pain to memorize.
>
> Regards,
> Greg
>
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