Re: Policing in one class with LLQ

Hi Jared,

On Tue, Feb 16, 2010 at 7:09 PM, Jared Scrivener
<lists_at_jaredscrivener.com> wrote:
>
> Unlike the bandwidth command, the priority command has an internal
> policer stopping it from using up excess bandwidth on the link. The
> example you describe is normally seen in accompaniment to the
> bandwidth command, I believe.

Deja vu?

http://www.groupstudy.com/archives/ccielab/200911/msg01728.html

:-)

See the "Which Traffic Classes Can Use Excess Bandwidth?" section of
this document:
http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080103eae.shtml

"The queueing system imposes an important exception to this rule with
a priority class. [...] the offered load of a priority class is
metered by a traffic policer. During congestion conditions, a priority
class cannot use any excess bandwidth."

"[...] it is important to understand that since the priority classes
are policed during congestion conditions, they are not allocated any
remaining bandwidth from the bandwidth classes. Thus, remaining
bandwidth is shared by all bandwidth classes and class-default."

"If a bandwidth or priority class should not exceed its allocated
bandwidth during periods of no congestion, you can combine the
priority command with the police command. This configuration imposes a
maximum rate that is always active on the class."

cheers,
Dale

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Received on Tue Feb 16 2010 - 20:22:45 ART