[cisco-voip] QoS for Circuit Emulation over IP ?

[Justin Steinberg]

Assuming you want to mark your CEM traffic as EF, add the command 'ip dscp 46'

dscp 46 = EF

You will then need to verify your QoS policies end-to-end on the IP
path between the two 2821's to verify that dscp EF traffic has
priority.

On Dec 28, 2007 9:40 PM, d4rk f1br <d4rkf1ber at gmail.com> wrote:
> "I don't think the traffic is marked but I may be wrong.
>
> There is a command "ip dscp ??" that can be used to mark packets originating
> from the CEM.  But the examples list numbers like "ip dscp 36" not EF
>
> You can find a diagram of the layout here:
>
> http://www.mediafire.com/?czgmxvd6dxs
>
>
> You mentioned marking it as close to the ingress as possible, I assume that
> would be the 2821s?
>
>
>
>
>
>
> On Dec 28, 2007 9:49 AM, Scott Voll <svoll.voip at gmail.com> wrote:
>
> >
> >
> > I'm with Jason.
> >
> > if the traffic is not marked by default.... mark it as close to to the
> ingress as possible.  IE. at the 2800 mark it so as it goes across your
> network it's marked all the way.  Since it's Voice I would mark it with DSCP
> EF like your other voice traffic so autoQOS could still be your friend. (but
> my Qos is almost as bad as yours)
> >
> > Scott
> >
> >
> >
> >
> > On Dec 27, 2007 5:14 PM, Jason Wydra <jasonwydra at gmail.com> wrote:
> >
> > > Not sure about Aspect phones. Do they automatically mark for voice
> traffic? If not, then I believe you need to manually mark voice traffic on
> the ingress switch ports.
> > >
> > >
> > >
> > >
> > >
> > > On Dec 27, 2007 6:22 PM, d4rk f1br <d4rkf1ber at gmail.com> wrote:
> > >
> > > >
> > > >
> > > >
> > > >
> > > > I am in the midst of deploying two Cisco 2821's, each of them contain
> a NM-CEM-4TE1.  Each 2821 connects to a 6509.  Each 6509 is connected via
> gig fiber links.
> > > >
> > > > The T1 side of each 2821 connects to some Aspect system.
> > > >
> > > > Anyway, I have things up and working, the circuit emulation is working
> and the remote Aspect shelf comes up which in turn brings up the Aspect
> phones.
> > > >
> > > > Voice quality is not perfect though, and I need to figure out some QoS
> to try to ensure this traffic gets the highest priority.
> > > >
> > > > Not sure the best way to approach this, as I suck (MAJOR SUCK) at QoS,
> my track record thus far is umm... well lets move on, thank god for autoqos!
> :-)
> > > >
> > > > My guess is I have to do something on the 2821s although I am not sure
> if that really is needed since the only thing the 2821's do is handle this
> single T1.
> > > >
> > > > I am certain the 6509's are going to need something to prioritize the
> traffic coming in from the 2821's and ensure that this traffic takes
> precedence both coming in and leaving.
> > > >
> > > > I got the QoS SRND (my Cisco sales engineer sent it to me when I asked
> about suggestions related to this)  gee thanks huh... 300+ pages of qos
> material... yeah!
> > > >
> > > > Trying to narrow down what I need to look for and research, not asking
> for a cut and paste example config, as I know every network is different.  I
> am just not sure where to approach this from.
> > > >
> > > > Anything special about the circuit emulation I would need to consider,
> do I tag it some how the same as my other voip traffic for the cisco phones?
> Not sure where to start looking you know, so any suggestions or tips would
> be appreciated.
> > > >
> > > > Thx!
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> > > >
> > >
> > >
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> > >
> >
> >
>
>
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