[cisco-voip] QOS for MPLS

[Carter, Bill]

With MPLS and sites with different bandwidths, you should set the QoS
based on the site bandwidth.  So it is ok to have 800k on the T1's and
2500k on the DS3's.  Locations would prevent HQ from flooding a
particular site.  

Because of the mesh possibilities of MPLS, I would set the HQ Location
bandwidth to unlimited and the remote at ~800kb. 

If this is Unified CM 5.X you could use RSVP.  CM locations are more
designed for a Hub and Spoke network.  RSVP accommodates a meshed
topology.

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jonathan
Charles
Sent: Sunday, May 27, 2007 4:54 PM
To: Erick Bergquist
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] QOS for MPLS

Which is the definition of MPLS, any-to-any communication. All circuits
are point to point into the MPLS cloud and then routing in the cloud to
each site.



Jonathan

On 5/27/07, Erick Bergquist <erickbe at yahoo.com> wrote:
> 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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