Re: Priority vs Policing

Also I want to point out that LLQ has a built in policer as well. So,
"priority 30" means guaranteed 30kbps but also policed to 30kbps as to not
starve other queues.

On Wed, Jul 29, 2009 at 9:12 AM, Molomo <letjedilakopa_at_gmail.com> wrote:

> Swap,
> I was indeed confusing the terms, makes sense now.
>
> Thanks
>
> On Wed, Jul 29, 2009 at 2:56 PM, Swap <ccie19804_at_gmail.com> wrote:
>
> > Your understanding is almost correct with a slight confusion on the term
> > "rate-limit".
> >
> > When you say "Traffic in this class will ALWAYS be rate limited to 30Kbps
> > congestion or not, conforming traffic will be transmitted and excess
> > dropped." - I think you feel that you are getting a guaranteed "minimum"
> > bandwidth of 30kbps but in actual it doesn't mean that.
> >
> > "Rate-limit" instead means that if you cross the policed CIR, your
> traffic
> > will be dropped. So even if voice traffic is under 30kbits/sec, if there
> is
> > congestion, Voice traffic will be dropped.
> >
> > Priority - you already know what it is..
> >
> > HTH
> >
> > Swap
> > #19084
> >
> > -----Original Message-----
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> > Molomo
> > Sent: Wednesday, July 29, 2009 4:30 PM
> > To: ccielab_at_groupstudy.com
> > Subject: Priority vs Policing
> >
> > Experts,
> > Correct me if I'm wrong on the understanding of Priority and Policing in
> a
> > policy-map , MQC.
> >
> > policy-map POLICY_MAP
> > class VOICE
> > priority 30
> >
> > Traffic in this class will be gauranteed maximum 30Kbps bandwidth and
> will
> > always be send first. When there is no congestion excess traffic will be
> > forwared but not prioritized and during congestion excess traffic will de
> > dropped.
> >
> > policy-map POLICY_MAP
> > class VOICE
> > police 30000 1000 conform-action transmit exceed-action drop -
> >
> > Traffic in this class will ALWAYS be rate limited to 30Kbps congestion or
> > not, conforming traffic will be transmitted and excess dropped.
> >
> > Now if my understanding is correct why is it that in most
> > implementations voice traffice is used with priority (LLQ). IMO it will
> > make
> > more sense to use policing for voice class because ideally you would
> > always want voice traffic strict policed- congestion or no congestion.
> >
> > Or am I missing something?
> >
> >
> > Rgds,
> > Molomo
> >
> >
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> >
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-- 
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Joe Astorino - CCIE #24347 R&S
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