RE: EIGRP metric question

From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Mon May 08 2006 - 08:59:17 ART

Hello Dave,

The formula set on the Cisco Page is ok, try the formula again but this time
using 256*[10^7/Bw+(Delay/10)]

http://www.cisco.com/warp/public/103/3.html

States: "To find the bandwidth, find the smallest of all the bandwidths in
Kbps from outgoing interfaces and divide 10,000,000 by that number. (The
bandwidth is scaled by 10,000,000 in kilobits per second.)

In order to find the delay, add all of the delays (in microseconds) from the
outgoing interfaces and divide this number by 10. (The delay is in tenths of
microseconds.)"

And as you probably know the show ip route and the show ip eigrp topology
Net Netmask would help you seeing these values.

HTH
Victor.

-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
Schulz, Dave
Enviado el: Lunes, 08 de Mayo de 2006 07:05 a.m.
Para: petrsoft@gmail.com
CC: ccielab@groupstudy.com
Asunto: Re: EIGRP metric question

Thanks, Petr. I see your explanation and it is very clear. Thanks.
However, I was trying to see how this relates to the formulae in the docCD
for " values, which is slightly different. Any thuoghts?

Dave Schulz
*** Sent from my Blackberry ***

-----Original Message-----
From: Petr Lapukhov <petrsoft@gmail.com>
To: Schulz, Dave <DSchulz@dpsciences.com>
CC: ccielab@groupstudy.com <ccielab@groupstudy.com>
Sent: Mon May 08 00:51:43 2006
Subject: Re: EIGRP metric question

Dave,

You see, basic EIGRP metric is:

256*[10^7/Bw+Delay]

(Bw is measured in Kb/s)

So here we go:

You have minimum Bw = 64, Delay = 1 + 2000

(2000 is standard delay for serial interface)

256*[10^7/64 + 2000 + 1] = 40512256

Petr

2006/5/8, Schulz, Dave <DSchulz@dpsciences.com>:

        Group -
        
        I am working with EIGRP metric and trying to plan for a metric that
is being
        redistributed from ospf into eigrp on a router (R1) and forwarded to
R4 via
        EIGRP. So, I have a link between R1 and R4 set up as 64k and R1
looks like
        this:
        
        router eigrp 100
        redistribute ospf 1 metric 10000 1 255 1 1500
        network 172.16.0.0
        no auto-summary
        !
        router ospf 1
        log-adjacency-changes
        redistribute eigrp 100 subnets
        network 192.168.1.0 0.0.0.255 area 0
        neighbor 192.168.1.2
        neighbor 192.168.1.3
        
        Based on the K-values (default) 1 0 1 0 0, I would assume that the
formulae
        should allow us to determine the metric at R4:
        
        metric = [K1*bandwidth + (K2*bandwidth)/(256 - load) + K3*delay] *
        [K5/(reliability + K4)]
        
        This metric should be (64000 * 1) + (1 * 10 usec). However, this
doesn't seem
        to be case as the show ip route on R4 shows the metric at 40512256.
        
        Gateway of last resort is not set
        
             2.0.0.0/32 <http://2.0.0.0/32> is subnetted, 1 subnets
        D EX 2.2.2.2 [170/40512256] via 172.16.14.1, 00:25:15, Serial1/0
        
        Can someone please help clear up this confusion. Much thanks!
        
        Dave
        
        

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