RE: QoS quiz

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
> 
> 
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