Re: Using EIGRP Variance

Dear Shahid

I think this is a common misunderstanding about EIGRP unequal cost LB.

The routes that have to be load balanced have to pass the feasiblity
condition. In your case the FD values is 624896. And the advertised
distance (AD) of the other route is 833280. For this alternate route to
pass the feasibility condition; the AD should be less then FD (i.e.
something less than 624896).

Best Regards

CCIE Salik

On Sun, May 13, 2012 at 6:24 PM, Shahid Mushtaq <bxperts_at_gmail.com> wrote:

> Dear Forum,
>
>
>
> I am facing the issue with EIGRP Un-Equal cost load balancing. Even by
> using
> variance the link with low cost is not installed inside routing table.
>
>
>
> Below is the EIGRP topology table and the configuration.
>
>
>
> ================================
>
> R6#show ip eigrp topology 10.10.24.0 255.255.255.0
>
> IP-EIGRP (AS 100): Topology entry for 10.10.24.0/24
>
> State is Passive, Query origin flag is 1, 1 Successor(s), FD is 624896
>
> Routing Descriptor Blocks:
>
> 10.10.1.5 (FastEthernet0/0), from 10.10.1.5, Send flag is 0x0
>
> Composite metric is (624896/624896), Route is Internal
>
> Vector metric:
>
> Minimum bandwidth is 4096 Kbit
>
> Total delay is 3000 microseconds
>
> Reliability is 255/255
>
> Load is 1/255
>
> Minimum MTU is 1476
>
> Hop count is 2
>
> 10.10.1.3 (FastEthernet0/0), from 10.10.1.3, Send flag is 0x0
>
> Composite metric is (833280/833280), Route is Internal
>
> Vector metric:
>
> Minimum bandwidth is 3072 Kbit
>
> Total delay is 3000 microseconds
>
> Reliability is 255/255
>
> Load is 1/255
>
> Minimum MTU is 1500
>
> Hop count is 2
>
> ==========================================
>
> R6#sh run | s eigrp
>
> router eigrp 100
>
> variance 2
>
> network 10.10.1.1 0.0.0.0
>
> metric weights 0 1 0 0 0 0
>
> no auto-summary
>
> neighbor 10.10.1.5 FastEthernet0/0
>
> neighbor 10.10.1.3 FastEthernet0/0
>
> =========================================
>
>
>
> Regards,
>
>
>
>
> Shahid
>
>
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Received on Sun May 13 2012 - 19:06:23 ART