From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Mon Mar 18 2002 - 14:28:33 GMT-3
Peter,
You are correct that when K5 == 0, the last term isn't used, however
that's not what Sandro was referring to. Only K1 and K3 are weighted by
default. This simply means that IGRP and EIGRP only use bandwidth and delay
in their metric calculation by default. If you want load or reliability to
be factored in, you have to weight the other constants. This is
accomplished by using the "metric weights" command under the IGRP or EIGRP
process.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r
/iprprt2/1rdeigrp.htm#xtocid15
HTH
Brian McGahan
CCIE #8593
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
----- Original Message -----
From: "Park, Peter" <peter.park@digex.com>
To: "'Sandro Ciffali'" <sandyccie@yahoo.com>; <ccielab@groupstudy.com>
Sent: Monday, March 18, 2002 10:54 AM
Subject: RE: Igrp metric calculation
> Jeff says.......on page 243
>
> The last term [K5/(Reliability+K4)] DOES NOT get used..... IF K5 = 0
>
> So...if K5=0,
>
> Metric = [K1*BW+(K2*BW/(256-LOAD)+K3*DLY]
>
>
>
>
>
> -----Original Message-----
> From: Sandro Ciffali [mailto:sandyccie@yahoo.com]
> Sent: Monday, March 18, 2002 10:50 AM
> To: ccielab@groupstudy.com
> Subject: Igrp metric calculation
>
> As per Jeff Doyle the IGRP metric calc. formula is as
> follows
>
>
> [K1*BW+(K2*BW/(256-LOAD)+K3*DLY]*[K5/(Reliability+K4)]
>
> By default K1=K3=1 and K2=K4=K5=0,
>
> But if K5=K4=0 then the last term in the above formula
> is zero (K5/Rel..), so then the product of any number
> with a zero is zero, So how come the formula reduces
> to
>
> K1*BW+K2DLY
>
> Can some one pls. explain....
> Sandro
>
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