Re: A question on QoS

Chetan,
even if you can run IOS in routers and switches, the supported
configuration is quite different in them.
Routers (actually ISRs) are more or less standard and support a given
set of actions for traffic that you can configure using CBMQC.
Shaping being one of them.

Switches are not that standard in my experience. And even though
you can use CBMQC, you can not use that to configure shapping.
Reason being, among other things, that switches do most of the work
in hardware and it is not as versatile as the routers's software based
packet management (but a lot faster thought!).

So, to answer your Qs:
1- Depends on the platform. Router ? Then policy-map.
Switch ? Then mls-qos. But keep in mind you won't be able to do
the same.

2- No. Actually, does not apply.

3- No. Look at the things you can configure in policy maps for switches.
You can play with policers and QoS marking, but you have no "visibility"
of the hardware queues.

-Carlos

Chetan R @ 12/03/2012 22:52 -0300 dixit:
> Hi,
>
>
> I am new to QoS. I have a few questions regarding qos. It would be great if
> someone can help me with it.
>
>
> 1. For shaping, we can either configure a policy-map with "shape
> peak|average" under it OR use "mls qos" commands to implement it. My
> question is, how to decide what to use.
>
>
> 2. If i do not issue any "mls qos" commands and just use "shape
> peak|average" under the policy-map , are the mls qos value for the port
> automatically calculated and applied based the value configured using the
> "shape peak| average" command?
>
>
> 3. When using CBWFQ, do we treat each class of traffic as a different
> queue? If yes, how is the mapping of this done into the queues at the port?
>
>
>
> Thanks and Regards,
>
> Chetan
>
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net