RE: Q: max-reserved-bandwidth vs frame-relay mincir?

From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Wed May 24 2006 - 12:51:44 ART

Petr many thanks for taking time for this..

But what if I do not have adaptive shaping configured and I use mincir in
the map-class (does not have any effect right?)

Victor.

  _____

De: Petr Lapukhov [mailto:petrsoft@gmail.com]
Enviado el: Miircoles, 24 de Mayo de 2006 11:43 a.m.
Para: Victor Cappuccio
CC: ccielab@groupstudy.com
Asunto: Re: Q: max-reserved-bandwidth vs frame-relay mincir?

Victor,

first, you probably confuse a bit GTS and MQC/CBTS/CBWFQ :)

This is CBWFQ queueing, where we have default 75% of reserved interface
bandwidth to play with.

With GTS we simply configure "traffic-shape rate" regardless of interface
resources. 

--

Now, let's move to FRTS + CBWFQ. Basically, we just want to introduce
CBWFQ as Per-VC queueing mechanism. We could do that in two ways:

1) Configure legacy FRTS (cir/mincir) and embed service policy (CBWFQ
config)
    into map-class

2) Confiure map-class, then introduce Class-Based Traffic Shaping with
service-policy,
    configuration, and embed yet  another service policy into that
"sandwich".

With both of those, we may configure adaptive traffic shaping (though there
are
some differences with features available).

Now, how should CBWFQ allocate bandwith for it's classes?

Let's imagine, that congestion has occured. If we have adaptive shaping
configured
(with mincir or shape adaptive), then our sending rate should probably
reduce to
minCIR. This is when congestion takes place, and therefore it sounds
reasonable
to allocate  bandwidth from minCIR value.

HTH
Petr

2006/5/24, Victor Cappuccio <cvictor@protokolgroup.com>:

Hello Guys

Quick question here about using GTS and Frame-relay TShaping

In GTS we can reserve the bandwidth from the default 75% using the
max-reserved-bandwidth, is this same as in Frame-relay TShaping but using
frame-relay mincir?

I thought that the frame-relay mincir would not have effect until I receive
BECNS and then the router could throttle back to the mincir gradually.

Example: look at Internetworks Experts Lab 16 Task 8.3

A little bit confused about that

Thanks

Victor.

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