Re: Clarification needed - Catalyst "Internal QoS" Label....

Robert Miele @ 28/12/2011 11:59 -0300 dixit:
> Thanks for the reply Carlos,
>
> I referred to it as "internal QoS" label as I believe I read somewhere
> online that on the 3560 it could either be DSCP or CoS.
>
> So the internal DSCP label and the DSCP label present in the L3 packet
> header can be two different values?

Yep, no problem for the switch, and you can keep the incoming value
on exit with DSCP transparency.

>
> Also, are these internal DSCP labels applied to non-IP traffic?

I would say so, but I don't know. Is there non IP trafic ? :)

>
> Thanks again!

You are welcome,
-Carlos
>
>
> > Date: Wed, 28 Dec 2011 07:42:29 -0300
> > From: tron_at_huapi.ba.ar
> > To: guile474_at_hotmail.com
> > CC: ccielab_at_groupstudy.com
> > Subject: Re: Clarification needed - Catalyst "Internal QoS" Label....
> >
> > I guess you are referring to "internal DSCP" ?
> > If so, this is a normalized way of treating QoS clasification of trafic
> > across different architectures.
> >
> > I would not call it a "parameter" because you don't set it.
> > It is a value that gets attached to flowing frames/packets (a field, if
> > you like, but not in the packet but in a control data structure internal
> > to the switch). And it determines how the QoS functions affect the
> > frame during its switching.
> >
> > This way you can define policies on input interfaces (to pay attention
> > to COS os TOS or static values) and mappings, and then use the same
> > internal treatment for all based on internal DSCP. It also allows you
> > to do remarking on exit of TOS (or not).
> >
> > -Carlos
> >
> > Robert Miele @ 27/12/2011 23:22 -0300 dixit:
> > > Hello,
> > >
> > > I'm hoping someone can help me understand the concept of the
> "internal QoS"
> > > label on the 3560 Catalyst switch from an architectual viewpoint.
> > >
> > > For example, is this "internal QoS" a parameter internal to the
> switch, or is
> > > a field added to the packet, or is it simply rewriting the value in the
> > > DSCP/CoS fields.
> > >
> > > Thanks!
> > >
> > >
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> > >
> >
> > --
> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
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> >
> >

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net