[c-nsp] QOS difference behavior for GSR and 7609

[Oliver Boehmer (oboehmer)]

Hu Xu,

you should really rephrase the question, as it's unclear what you're
trying to do (at least to me at this stage). 

Yes, WRR and MDRR as queuing/scheduling mechanisms on the PFC
(65xx/76xx) and on the GSR are different, but what is really the biggest
practical difference is the way queuing is configured: While the GSR
uses the MQC syntax with class-maps/policy-maps and "bandwidth" to
assign bandwidth/ratios to the different queues (and with priority to
denote a queue PQ), the PFC QoS requires you to use
wrr-queue/priority-queue syntax, which is, at least to me, more
cumbersome.

By nature, QoS is very platform/hardware dependent. MQC is an attempt to
abstract the HW complexity, but even there you'll see noticeable
differences between platforms/linecards/xxx..

Oh, and I just found your initial post: You imply there that GSR doesn't
use PQ/WRED, which is not the case.. Both platforms support PQ, and both
support WRED for congestion avoidance. but they're configured very
differently.
If you want to transform the MQC configu to 6500, you should read up on
PFC QoS or 6500 QoS. or let me see if I can find some time later this
week..

	oli

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of jstuxuhu0816
> Sent: 16 May 2012 03:27
> To: Pete Templin
> Cc: cisco-nsp
> Subject: Re: [c-nsp] QOS difference behavior for GSR and 7609
> 
> Do you have any related experience about this?
> Or do you have ever configured about this?
> 
> 
> 
> Thanks and Regards,
> Hu Xu
> 
> From: Pete Templin
> Date: 2012-05-16 01:29
> To: Xu Hu
> CC: cisco-nsp
> Subject: Re: [c-nsp] QOS difference behavior for GSR and 7609
> On 5/14/12 7:54 PM, Xu Hu wrote:
> > Ok, do you heard about the MDRR in the GSR? What's the main purpose
of
> this QOS approach?
> 
> Yes, we've heard of it.  Its purpose is to manage QoS through a 64x64
> (or 16x or 128x, platform-dependent) crossbar fabric.
> 
> pt
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