From: Radoslav Vasilev (deckland@gmail.com)
Date: Wed Aug 16 2006 - 12:55:55 ART
Hi Tim,
The unequal-cost load-balancing with EIGRP and the use of EIGRP variance
command is subject to one aditional restriction (other than the mere best
metric x variance multiplying):
FC
(feaseability condition).
If you take a look at your output bellow, the AD (advertised distance) of
the route from R1 (1658112) is begger then the FD (feasable distance) from
R5
This means that even if you put the maximum variance, that won't work. You
need to change your eigrp metric in such a way as to make the R1's
advertised route to satisfy the FC.
Sorry, but you'll need to play with the delays on your own ;)
Rado
On 8/16/06, Tim Chan <timanji@yahoo.com> wrote:
>
> Hi all, I hope someone can help me out...
>
> I understand the concept of eigrp variance, but where do you start in
> configuration?
>
> Setup: 3 routers. R4 connects to R5 via ethernet, R1 connects to both R4
> and R5 via frame-relay.
> The task wants R4 to have a load share of 4:1 towards R5.
>
> On my Router 4, here is the topology to my destination:
>
> R4#sho ip eig top 222.22.2.0
> IP-EIGRP (AS 1024): Topology entry for 222.22.2.0/24
> State is Passive, Query origin flag is 1, 1 Successor(s), FD is 256256
> Routing Descriptor Blocks:
> 174.1.45.5 (Ethernet0/1), from 174.1.45.5, Send flag is 0x0
> Composite metric is (256256/256000), Route is External
> Vector metric:
> Minimum bandwidth is 10000 Kbit
> Total delay is 10 microseconds
> <snip>
> 174.1.145.1 (Serial0/0), from 174.1.145.1, Send flag is 0x0
> Composite metric is (2170112/1658112), Route is External
> Vector metric:
> Minimum bandwidth is 1544 Kbit
> Total delay is 20010 microseconds
> Reliability is 255/255
>
> My metric towards R5 is 256256. So I assume I need a metric towards R5 to
> be less than 4x 256256?
> How do I go about figuring that out? Do I just start randomly picking
> delay values?
>
> In the solutions guide, they used "delay 21500" for serial 0/0 and "delay
> 6000" for ethernet0/1.
> Where did those numbers come from?
>
> Or am I missing something simple?
>
> In case you're interested, this is from IEWB Lab 8 - Task 3.7
>
> thanks!
> -tim
>
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