RE: QoS quiz

It is the same as your configuration. I didn't include the parent because
you already had that covered. I used priority percent instead of a bandwidth
value, because then I can use it across multiple shaper values with only
needing to change one parameter for different configurations.

David

--
http://dcp.dcptech.com
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Carlos G Mendioroz
> Sent: Friday, June 17, 2011 6:35 PM
> To: David Prall
> Cc: 'Cisco certification'
> Subject: Re: QoS quiz
> 
> The problem with this configuration, which AFAIK is "by the book",
> is that it does not protect the Voip stream.
> 
> If you have a data stream that is going over your shape rate,
> the shape buffer will be full and your voip traffic has to cross it!
> (Read, you will have jitter at best, lost packets more than likely)
> 
> -Carlos
> 
> David Prall @ 17/06/2011 18:49 -0300 dixit:
> > Carlos,
> > So I would do:
> > Class-map match-all voice
> >  Match protocol rtp
> >  Match dscp ef
> > Policy-map child
> >  Class voice
> >   Priority percent 25
> >  Class class-default
> >   Bandwidth remaining percent 100
> >   Set dscp 0
> >
> > David
> >
> > --
> > http://dcp.dcptech.com
> >
> >
> >> -----Original Message-----
> >> From: Carlos G Mendioroz [mailto:tron_at_huapi.ba.ar]
> >> Sent: Friday, June 17, 2011 5:40 PM
> >> To: David Prall
> >> Cc: 'Cisco certification'
> >> Subject: Re: QoS quiz
> >>
> >> Right.
> >> This is *one* thing I left out. All traffic should be marked.
> >> -Carlos
> >>
> >> David Prall @ 17/06/2011 18:31 -0300 dixit:
> >>> You are matching on RTP, is all RTP already marked EF? You are
> using
> >> shape
> >>> average to provide artificial back-pressure at 2Mbps. You have
> >> provided for
> >>> 500Kbps within the 2Mbps so you will be fine as long as the carrier
> >> is
> >>> providing priority for the RTP traffic, if they are providing
> >> priority for
> >>> EF then you need to confirm that the application is setting EF or
> >> remark the
> >>> traffic on your own to EF. You also need to confirm that the
> traffic
> >> that is
> >>> not RTP, is not marked EF, otherwise the SP will put it into their
> EF
> >> queue
> >>> along with your RTP EF traffic, so remarking the class-default to 0
> >> may help
> >>> here.
> >>>
> >>> David
> >>>
> >>> --
> >>> http://dcp.dcptech.com
> >>>
> >>>> -----Original Message-----
> >>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> Behalf
> >> Of
> >>>> Carlos G Mendioroz
> >>>> Sent: Friday, June 17, 2011 5:05 PM
> >>>> To: Cisco certification
> >>>> Subject: QoS quiz
> >>>>
> >>>> Easy one, I would think.
> >>>>
> >>>> Say you have a wan link provided over metro (i.e. access rate is
> >> well
> >>>> over your contracted BW) and you want to apply QoS to protect your
> >>>> Voip.
> >>>>
> >>>> You have 2Mbps contract, 25% limit on EF marked traffic.
> >>>>
> >>>> Will this config do the right thing (i.e. protect your voip
> traffic
> >>>> from jitter caused by your data) ?
> >>>>
> >>>> class-map voice
> >>>>    match protocol rtp
> >>>>
> >>>> policy-map child
> >>>>   class voice
> >>>>    priority 500
> >>>>   class class-default
> >>>>    bandwidth remaining percent 100
> >>>>
> >>>> policy-map parent
> >>>>   class class-default
> >>>>    shape average 2000000
> >>>>    service-policy child
> >>>>
> >>>> inferface fastEthernet0/0
> >>>>   service-policy output parent
> >>>>
> >>>> --
> >>>> Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
> >>>>
> >>>>
> >>>> Blogs and organic groups at http://www.ccie.net
> >>>>
> >>>>
> >>
> _______________________________________________________________________
> >>>> Subscription information may be found at:
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> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >> --
> >> Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
> >
> 
> --
> Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
> 
> 
> Blogs and organic groups at http://www.ccie.net
> 
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