[c-nsp] Subrate speed on GigE requiring QoS / Policer configuration

[Chris Evans]

Keegan,

When there is no congestion I don't need it to do anything. The config that
Ben posted is exactly what I'm looking for.

On Tue, Oct 5, 2010 at 11:20 PM, Keegan Holley <keegan.holley at sungard.com>wrote:

> Do you really need he qos configuration to do anything when there's no
> congestion?  In other words if you're only using 5m or so and everything is
> ok what would you want the qos to do there?  If you make af and ef priority
> queues you can ensure that traffic is given priority and also that it does
> not starve other flows.  The one caveat is that when here's no congestion
> they still will use more than 2m each.  I'm no qos expert but i know can
> assign drop probability so that certain traffic is dropped at a higher rate,
> but even that is only done during times of congestion.  I'm not sure if you
> need you policy when there's no congestion.  Unless I'm missing something.
>
> Sent from my iPhone
>
> On Oct 5, 2010, at 10:49 PM, Chris Evans <chrisccnpspam2 at gmail.com> wrote:
>
> > I'm struggling to come up with a solution for my requirement..
> Essentially
> > we are building a lab using GRE to link two sites over our enterprise
> > network. As this is a lab we want to limit the bandwidth that comes out
> of
> > the LAB to 15megabits, but using GigE for the physical connection on an
> > asr1k. Essentially my first thought was implement a policer on the egress
> > interface limiting the maximum aggregate traffic to 15Mb, then qos
> scheduler
> > on the tunnel interface or egress GigE. I need to prioritize certain
> traffic
> > leaving the lab so I also want to use a scheduler to make sure that the
> > voice traffic has priority and has a 2Mb of traffic for example.
> >
> > I want to limit my EF traffic to 2Mb, AF to 2Mb, NC to 500Kb and best
> effort
> > to 10.5Mb under signs of congestion within that 15Mb CIR. My challenge is
> > that QoS only kicks in under signs of congestion, how would you allow the
> > dynamic bandwidth allocation when the egress interface is really a GigE?
> >
> > Anyone have a good configuration that would fit my needs?
> >
> > Thanks
> >
> > Chris
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