RE: LLQ for Voice Traffic

From: Salau, Yemi (yemi.salau@siemens.com)
Date: Tue May 13 2008 - 13:19:35 ART

David,

If you have a customer you want to do LLQ for, you have to ask for what
sort of traffic they want to prioritise ... voice/video/email etc.

LLQ feature can be used for any kind of traffic, from technical
perspective. So you have to specify, but in this case, I assume you're
referring to voice traffic which can be matched by rtp protocol.

So if you're doing your configs you would do something similar to this:

class-map cvoice
  match ip rtp x y

policy-map pvoice
  class cvoice
      priority z
  class class-default
      fair-queue

In this case, all traffic will go into class-default queue while the
voice traffic matched by cvoice will go into the priotised queue/LLQ
queue. Remember this means z rate of cvoice traffic is only guaranteed
low latency at times of congestion. Outside congestion times, you can
burst above this rate, provided your traffic wouldn't get chopped by
your service provider.

Many Thanks
 
Yemi Salau

-----Original Message-----
From: davidytk [mailto:davidytk@netvigator.com]
Sent: Tuesday, May 13, 2008 4:53 PM
To: Salau, Yemi
Subject: RE: LLQ for Voice Traffic

Hi

This is a MC question from Voice Written.

When using the Low Latency Queuing feature of QOS.

A: All RTP traffic serviced by LLQ and All Data Traffic is serviced
by
        CBWFQ.
B: None of the above.

Thanks

David

-----Original Message-----
From: Salau, Yemi [mailto:yemi.salau@siemens.com]
Sent: 2008-05-13 23:49
To: davidytk
Subject: RE: LLQ for Voice Traffic

Please post your configs ...

But you would normally put voice class of traffic into the priority
queue and others into the default class which you can do anything with
really.

The concept of LLQ is a "special-kind"/implementation of CBWFQ with an
additional level of priotisation which guarantees low latency and delay
of respective traffic.

I hope I answered you correctly.

Many Thanks
 
Yemi Salau

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
davidytk
Sent: Tuesday, May 13, 2008 4:33 PM
To: ccielab@groupstudy.com
Subject: LLQ for Voice Traffic

Hi all

 

I found a question.

 

When using the Low Latency Queuing feature of QOS.

 

Does it correct?

 

All RTP traffic serviced by LLQ and All Data Traffic is serviced by
CBWFQ.

 

Thanks

David

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