From: Jason Sinclair (sinclairj@xxxxxxxxxxxxxxx)
Date: Wed Jul 24 2002 - 20:57:26 GMT-3
All,
I think some clarification may be in order here. The formula for calculating
the EIGRP composite metric is as follows:
CompMetric = (k1 * BW + [[(k2 * BW)/(256-load)] + (k3 * delay)] * [k5 /
(reliability + k4)] * 256
Hence with the defaults:
K1 = 1
K2 = 0
K3 = 1
K4 = 0
K5 = 0
BW = 10^7 / minBW
The formula becomes:
[(10^7 / minBW) + sum of delay] * 256
So k1 modifies the use of bandwidth, k2 makes use of load, k3 modifies the
delay factor, k5 takes reliability into account and k4 modifies the factor
priority plays.
It is important to know this and also how the varying k factors are used.
Another important fact is that although EIGRP tracks MTU it is used for
internal loop avoidance and is NOT used for manipulating the comp metric.
Jason Sinclair CCIE #9100
Manager, Network Control Centre
POWERTEL
55 Clarence Street,
SYDNEY NSW 2000
AUSTRALIA
office: + 61 2 8264 3820
mobile: + 61 416 105 858
email: sinclairj@powertel.com.au
-----Original Message-----
From: Joe A [mailto:GroupStudy@comcast.net]
Sent: Wednesday, 24 July 2002 14:19
To: 'kpalmer'
Cc: ccielab@groupstudy.com
Subject: RE: EIGRP tos k1 k2 k3 k4 k5
By default they're based on bandwidth and delay. The defaults for the K
values are:
K1 and K3 = 1
K2, K4 and K5 = 0
Given this, look at the formula at top of Doyle pg 243. DLY is multiplied
by K3 and K3 = 1 by default, so DLY will be used by default.
I made a cheat-sheet that looks like this :
Value| Affects
K1 BW
K2 LOAD
K3 DLY
K5 RELIABILITY
K4 Beats me!
Of course, I use this to study and not as a real 'cheat-sheet', just wanted
to clarify that!
- Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
kpalmer
Sent: Tuesday, July 23, 2002 10:37 PM
To: ccielab@groupstudy.com
Subject: EIGRP tos k1 k2 k3 k4 k5
Hi~
I'm confused here.
k0 k1 k0 k1 k0 k0 = EIGRP default composite metric calc, right?
So,
0=tos, which is obsolete.
1=bandwidth ?
0=delay ?
1=reliability?
0=load ?
0=mtu ?
I don't think this is correct for the fact that Doyle, on my lap,
is saying boldly that bandwidth and delay are used metrics by default.
So, I have something out of order above?
The IOS is usually pretty descriptive/helpful in these situations.
But when I'm using the command, >metric weights 0 ?
>k1 (1-4698989...?)
k1, great.?? ..maybe it's doesn't even correlate to the above at all?
...OR YOU THINK IT WOULD SAY. >K1 bandwidth (1-4698989...?)
Obviously,...HELP
KPALMER
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