RE: QOS Priority

Please have a look at the follow, to my understanding priority command will only apply if the link is not congested, but in lab i am see drops if the traffic rate exceeds configured priority rate even if the link is not congested.

"During congestion conditions, the traffic class is guaranteed bandwidth
         equal to the specified rate. (Recall that bandwidth guarantees are only an
         issue when an interface is congested.) In other words, the
         priority command provides a minimum bandwidth
         guarantee.
  
In addition, the priority command implements
         a maximum bandwidth guarantee. Internally, the priority queue uses a token
         bucket that measures the offered load and ensures that the traffic stream
         conforms to the configured rate. Only traffic that conforms to the token bucket
         is guaranteed low latency. Any excess traffic is sent if the link is not
         congested or is dropped if the link is congested. For more information"
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> From: khanzadap_at_hotmail.com
> To: joe_at_affirmedsystems.com; ccielab_at_groupstudy.com
> Subject: RE: QOS Priority
> Date: Mon, 27 Aug 2012 12:03:06 +0000
>
>
>
> according to the link below,class configured with Priority command -The class can exceed its configured bandwidth, but in lab i see it being policed to configured traffic rate.
>
> thanks
>
>
>
> > From: joe_at_affirmedsystems.com
> > To: khanzadap_at_hotmail.com; ccielab_at_groupstudy.com
> > Subject: RE: QOS Priority
> > Date: Mon, 27 Aug 2012 09:06:31 +0000
> >
> > Your describing the "bandwidth" command - which does NOT have a built-in policer; the priority command does.
> >
> > Check this link -
> >
> > http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080103eae.shtml
> >
> > don't forget the interface command - "max-reserved-bandwidth"
> >
> > thanks
> >
> >
> > -----Original Message-----
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of sameer khan
> > Sent: Monday, August 27, 2012 4:53 AM
> > To: groupstudy
> > Subject: QOS Priority
> >
> > Hey
> >
> > I need some clarification on the following, as far as i have understood it, the policy-map will or should only apply when the interface is facing congestion, but i can still see ping being limited to 8kbps. By the way i am testing it in Gns3
> >
> > Thanks
> >
> >
> > interface FastEthernet0/0
> > ip address 10.0.0.3 255.255.255.0
> > speed 100
> > full-duplex
> > service-policy output smtp
> >
> >
> > class-map match-all myclass
> > match access-group 105
> > !
> > !
> > policy-map mymap
> > class myclass
> > priority 8
> >
> >
> >
> > access-list 105 permit icmp any any
> >
> >
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Received on Mon Aug 27 2012 - 12:17:21 ART