From: Tarun Pahuja (pahujat@gmail.com)
Date: Thu Oct 25 2007 - 05:54:18 ART
Ananth,
The answer to your second query is as follows:
The formula you are referring to was derived from the assumption that
their are 10 Virtual circuits with a capacity of 256K hence
(256/10),and the .9 is coming from the configuration where 90% of the
total bandwidth is configured to be used per interface for EIGRP
updates.
As Per the First Query:
The bandwidth would be shared amongst data and routing updates. In an
event of congestion eigrp will be allowed to use 22.5Kbps of
bandwidth. By default it uses up to 50% of interface bandwidth.
HTH,
Tarun
On 10/25/07, Ananth Vk <ananth.vk@tcs.com> wrote:
> Hi All,
>
> I need a small clarification on eigrp ip bandwidth-percent command
> Following is the link and im pasting the extract from this link below..
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094063.shtm
> l
>
> ------------------------------------
> interface Serial 0.1 point-to-point
> bandwidth 25
> ip bandwidth-percent eigrp 123 90
>
> Note that EIGRP will not use more than 22.5Kbps (90% of 25K) on this
> interface, even though its
>
> capacity is 56Kbps. This configuration will not affect user data capacity,
> which will still be able to use
>
> the entire 56Kbps.
>
> Query
> 1.If EIGRP uses 22.5Kbps out of 56Kbps howcome the entire 56Kbps can be
> used for data traffic
> 2.Is BW for data not dependent on BW used for EIGRP updates ?
>
> If im right this whole concept is only to have a control on % of BW for
> updates.
> Shouldnt we have less BW for routing updates and more for data ?
> But i wonder why by default EIGRP will use 50% of default BW
>
> -----------------------------------------------------------------------------------
> Alternatively, if you want to set the interface bandwidth to reflect the
> PVC capacity, you can adjust the
>
> bandwidth percentage for EIGRP. In this example, the desired bandwidth for
> EIGRP is (256K/10)*.9 =
>
> 23.04K; the bandwidth percentage would be 23.04K/56K = .41 (41%). So the
> same effect would be
>
> had by configuring:
>
> interface Serial 0.1 point-to-point
> bandwidth 56
> ip bandwidth-percent eigrp 123 41
>
> 1. In this example im not sure why PVC capacity was desired to be
> 23K....and what's that 0.9 for, im a bit confused..
> ---------------------------------------------------------------------------------------
>
> Thanks
> Ananth
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