From: Biondino, Joseph (joseph.biondino@au.unisys.com)
Date: Thu Jun 12 2003 - 23:15:15 GMT-3
I think you can only make the K constants = 0 and 1 they fit into the
equation as follows (extracted for Cisco.com)
Use this command to alter the default behavior of IGRP routing and metric
computation and allow the tuning of the IGRP metric calculation for a
particular type of service (ToS).
If k5 equals 0, the composite IGRP or EIGRP metric is computed according to
the following formula:
metric = [k1 * bandwidth + (k2 * bandwidth)/(256 - load) + k3 * delay]
If k5 does not equal zero, an additional operation is performed:
metric = metric * [k5/(reliability + k4)]
Bandwidth is inverse minimum bandwidth of the path in BPS scaled by a factor
of 2.56 ? 1012. The range is from a 1200-bps line to 10 terabits per second.
Delay is in units of 10 microseconds. The range of delay is from 10
microseconds to 168 seconds. A delay of all ones indicates that the network
is unreachable.
The delay parameter is stored in a 32-bit field, in increments of 39.1
nanoseconds. The range of delay is from 1 (39.1 nanoseconds) to hexadecimal
FFFFFFFF (decimal 4,294,967,040 nanoseconds). A delay of all ones (that is,
a delay of hexadecimal FFFFFFFF) indicates that the network is unreachable.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r
/iprprt2/1rdigrp.htm
Kind regards,
Joseph Biondino
Network Specialist
UNISYS
Network Command Centre
115 - 117 Wicks Rd
North Ryde NSW 2113
Phone: 02 9857 3149
Group: 02 9390 1107
Fax: 02 9857 3122
-----Original Message-----
From: John Matijevic [mailto:matijevi@bellsouth.net]
Sent: Friday, 13 June 2003 12:04 PM
To: Biondino, Joseph; ccielab@groupstudy.com
Subject: Re: eigrp and metric
Joseph,
So if you change the value other than one on K1 for example, then how does
that fit in to the equation? How does eigrp come up with the new metric,
does it multiply the factor lets say bandwidth 2000 and you specify 5=k,
does it mulitply, divide, etc.?
because you can set up to 0-4294967295.
Sincerely,
Matijevic
----- Original Message -----
From: "Biondino, Joseph" <joseph.biondino@au.unisys.com>
To: "John Matijevic" <matijevi@bellsouth.net>; <ccielab@groupstudy.com>
Sent: Thursday, June 12, 2003 9:31 PM
Subject: RE: eigrp and metric
> John;
>
> My understanding is that K1 - K5 actually stanges for each of the possible
> Metrics used by EIGRP.
> Only K1 and K3 equal 1 the others equal zero. This is why Bandwidth and
> Delay are the only metrics used by EIGRP by default. If you change the
other
> K values for 0 to 1 the other variables Load, rely and MTU come into play.
>
> Kind regards,
>
> Joseph Biondino
> Network Specialist
> UNISYS
> Network Command Centre
>
> 115 - 117 Wicks Rd
> North Ryde NSW 2113
> Phone: 02 9857 3149
> Group: 02 9390 1107
> Fax: 02 9857 3122
>
> -----Original Message-----
> From: John Matijevic [mailto:matijevi@bellsouth.net]
> Sent: Friday, 13 June 2003 9:56 AM
> To: ccielab@groupstudy.com
> Subject: eigrp and metric
>
> Hello Team,
> I am currently studying the commands in the ios guide. And I have come
> across
> the following:
> metric weights tos k1 k2 k3 k4 k5, tos
> Type of service. Currently, it must always be zero.
>
> k1-k5
> Constants that convert an IGRP or enhanced IGRP metric vector into a
scalar
> quantity
>
> basically this command is to tune the metric calculation for eigrp.
Question
> what is meant by convert an eigrp metric vector into a scalar quantity?
> Maybe
> this should be a question for the eigrp developer, but I just want to
> understand why you would want to change the eigrp metric formula? I know
> that
> the offset command can increase the metric after calculation. It seems
that
> this is another way to change the metrics? Any insight greatly
appreciated.
> Sincerely,
> Matijevic
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