[cisco-voip] QOS for MPLS

[Erick Bergquist]

I've seen one or two setups where the MPLS was fully meshed (all sites could talk to any other site), which makes QoS even trickier. 

----- Original Message ----
From: "keli at carocomp.ro" <keli at carocomp.ro>
To: Jonathan Charles <jonvoip at gmail.com>
Cc: cisco-voip at puck.nether.net
Sent: Sunday, May 27, 2007 3:50:17 PM
Subject: Re: [cisco-voip] QOS for MPLS

That is correct (although you should take some overhead into account  
as well). However, if you do not perform Call Admission Control  
beforehand (you do not limit the maximum number of possible  
simultaneous calls) you've done nothing, or worse.

The classic example being when you have a line that supports 4 calls,  
when the fifth call enters the line, all calls will suffer packet loss  
and delay, not only the fifth one.

I'm not too versed in MPLS QoS, but the idea is always the same.  
Prioritize voice traffic, but don't let it kill your bandwidth, nor  
itself. Thus the need for CAC, then something like CBWFQ/PQ. If  
possible, voice traffic should be beneath shaping/policing limits, so  
that neither would affect it.

regards,
   Zoltan

Quoting Jonathan Charles <jonvoip at gmail.com>:

> My thinking is that I need to set the QOS to be the same as the
> maximum number of calls to/from each site.
>
>
> Jonathan
>
> On 5/27/07, keli at carocomp.ro <keli at carocomp.ro> wrote:
>> As long as it is about "calls", CAC is the sensitive way to go about
>> limiting the calls in the first place. Do QoS "As close to the source,
>> as possible", remember? :)
>>
>> If you do not have a CCM, but other set-up, you should still look in
>> this direction first - to limit the calls to a reasonable amount in
>> the given directions, before they are hitting your MPLS router.
>>
>> regards,
>>   Zoltan
>>
>> Quoting Paul Choi <asobihoudai at yahoo.com>:
>>
>>> He's talking about QoS for MPLS, not CAC.
>>>
>>> --- "Clouse, Chris" <chris.clouse at berbee.com> wrote:
>>>
>>>> Use CallManager locations to perform Call Admission
>>>> Control.
>>>>
>>>> Christopher Clouse, CCNP CCDP CCVP MCP Network+
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: cisco-voip-bounces at puck.nether.net
>>>> [mailto:cisco-voip-bounces at puck.nether.net] On
>>>> Behalf Of Jonathan
>>>> Charles
>>>> Sent: Saturday, May 26, 2007 11:35 AM
>>>> To: ciscovoip
>>>> Subject: [cisco-voip] QOS for MPLS
>>>>
>>>> I have always understood that QOS settings need to
>>>> match on both ends
>>>> of a circuit... so, if you allocate 800k on one
>>>> side, you need to do
>>>> the same on the other.
>>>>
>>>> I am now working on an MPLS circuit that has DS3s on
>>>> some sides, DS1s
>>>> on others... do I still need to match QOS settings?
>>>>
>>>> Customer wants 800k on the T1s and 2500k on the
>>>> DS3s... I don't think
>>>> it will matter as I am matching these bw limits on
>>>> the locations...
>>>> but how do I throttle calls from a DS3-side location
>>>> to a DS1
>>>> location?
>>>>
>>>> For example... main site is in Chicago, they have a
>>>> DS3, one remote
>>>> site is in Wichita and has a T1... so, I put 800k
>>>> for Wichita and
>>>> 2500k for Chicago... what is to stop Chicago from
>>>> flooding Wichita
>>>> with 2.5MB of calls?
>>>>
>>>>
>>>>
>>>> Jonathan
>>>
>>>
>>>
>>>
>>>
>>>
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