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

[d4rk f1br]

"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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