Re: LLQ with Bandwidth MQC

Hi Jared and all,

On Thu, Nov 26, 2009 at 3:09 PM, Jared Scrivener
<lists_at_jaredscrivener.com> wrote:
> The "priority" queue will have it's bandwidth reserved just like the
> "bandwidth" queues will. The distinction between them is that the priority
> queue gets served first and it has an internal policer so that it can never
> use unused bandwidth from another queue (like bandwidth queues can).

My understanding is that it's a congestion aware policer, so the
implicit policing function of LLQ is only activated when the interface
is experiencing congestion. An explicit policer can be configured
within the class to achieve the behaviour you've described above.

Note there are some interesting queueing changes with the HQF
introduced in 12.4(20)T. It's discussed here:
http://blog.ioshints.info/2009/11/first-hqf-impressions-excellent-job.html

Also, another plug (it's been a while) for Pavel's
max-reserved-bandwidth analysis:
http://www.boxoid.org/cisco/MAX-RESERVED-BANDWIDTH-AND-CBWFQ.pdf

cheers,
Dale

Blogs and organic groups at http://www.ccie.net
Received on Thu Nov 26 2009 - 15:41:27 ART