Re: QoS - Multiple LLQs

The LLQ queues feed into the same FIFO queue, but in the case there is
enough traffic in other classes to cause contention for the bandwidth,
the different priority queues will be policed to their separate rates.

Best example and application of this is for video. Video will
frequently use what it can get, and you want to make sure that it's
prioritized. You also don't want to let it take up the whole priority
queue, thus a dual priority queue configuration for video and voice.

-nick

On Wed, May 20, 2009 at 7:23 PM, Ryan West <rwest_at_zyedge.com> wrote:
> Dale,
>
> It's my understanding that multiple LLQs are simply FIFO priority queues
>
> Sent from handheld.
>
> On May 20, 2009, at 7:03 PM, "Dale Shaw" <dale.shaw_at_gmail.com> wrote:
>
>> Hi all,
>>
>> Can anyone describe in detail, or point me at a resource that
>> describes how the IOS queuing scheduler deals with multiple priority
>> queues/LLQs?
>>
>> I have a scenario where I'd like to provide LLQ for voice (RTP), as
>> well as specific *delay sensitive* voice signalling protocols.
>> Ideally, using MQC/LLQ, I'd like to keep them separate. Based on my
>> current understanding of the scheduler, there won't be a way to ensure
>> LLQ1 is emptied before de-queuing LLQ2 (like there is in PQ). That's
>> OK, as long as the combined bandwidth of both LLQs is guaranteed under
>> congestion, and both LLQs are serviced before any other queues. I'm
>> happy to be proven wrong about the relative LLQ priority though.
>>
>> I'm sure I've read about multiple LLQs before but I can't recall
>> where.
>>
>> cheers,
>> Dale
>>
>>
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Received on Wed May 20 2009 - 23:08:55 ART