From: Tarun Pahuja (pahujat@gmail.com)
Date: Fri Oct 26 2007 - 15:24:44 ART
ccie1101,
You can use LFI in various configurations depending
upon the scenario and the requirement. Basically, you need LFI for
links less that 768k to avoid access delay of voice packets. LFI
enables the router to chop off bigger data packets sitting in the
queue and interleave smaller voice packets to avoid excessive latency.
You can use MLP, Frame-relay Fragment to achieve LFI. When you use MLP
you specify the latency and the router automatically finds out the
fragment size. When you use the "frame-relay fragment" command, you
are specifying the fragment size based on maximum delay recommended by
Cisco for a specific link speed.
In some examples you will notice that cir=mincir, it is done as a
double safety measure, so that the route does not throttle back even
though frame-relay adaptive shaping is turned off. In addition to the
following you set Be=0 as well to avoid over subscription..
I would highly recommend that you read the following link:
http://cisco.com/en/US/tech/tk652/tk698/technologies_configuration_example09186a0080094af9.shtml
You will find many others ways of configuring LFI(would depend on the
scenario and requirement), What I mentioned was the most basic of
them. You can enable compression,Prioritization on the link as well.
HTH,
Tarun
On 10/26/07, ccie1101 <ccie1101@gmail.com> wrote:
> GS,
> The scenario is as follows. I want to have a link that gurantees latency
> for Voice Traffic.
> Therefore, I turn on 'frame-relay traffic-shaping' so that I can use the
> frame-relay fragment command.
> [1] If I want to gurantee maximum usage on the link, I make the CIR =
> minCIR, would I then need to
> turn off 'frame-relay adaptive-shaping becn' so that I can set the
> cir=mincir ?? I
> Pls advice ...or just don't do any 'frame-relay adaptive-shaping' on the
> interface ?
>
> [2] For Voice over the serial link, is the Tc value 10ms ? I always use the
> Tc as 125ms.
>
> Pls advice,
>
> Thanks,
> ccie1101.
>
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