Re: QOS for MPLS

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: "kelicarocomp.ro" <kelicarocomp.ro>
To: Jonathan Charles <jonvoipgmail.com>
Cc: cisco-voippuck.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 <jonvoipgmail.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, kelicarocomp.ro <kelicarocomp.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 <asobihoudaiyahoo.com>:
>>
>>> He's talking about QoS for MPLS, not CAC.
>>>
>>> --- "Clouse, Chris"
<chris.clouseberbee.com> wrote:
>>>
>>>> Use CallManager locations to perform Call
Admission
>>>> Control.
>>>>
>>>> Christopher Clouse, CCNP CCDP CCVP MCP
Network+
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: cisco-voip-bouncespuck.nether.net
>>>> [mailto:cisco-voip-bouncespuck.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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Re: QOS for MPLS

Thread: Re: QOS for MPLS