Re: LLQ with Bandwidth MQC

Interesting to mention that starting with 12.4(20)T, "the
max-reserved-bandwidth command no longer affects the amount of
bandwidth available to a service policy".

See all changes here:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6558/white_paper_c11-481499.html

Mihai

On Thu, Nov 26, 2009 at 6:41 AM, Dale Shaw <dale.shaw_at_gmail.com> wrote:
> 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
>
>
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Received on Thu Nov 26 2009 - 20:42:50 ART