From: Dave Meyer (dave.meyer@db.com)
Date: Wed Aug 25 2004 - 21:23:02 GMT-3
Alexei,
Do you find it more cost effective to pay for CIR or to purchase another PVC for voice ?
If I purchase say 768k CIR @ $xx per month over a T1 port and I set up my LLQ to use 10% of that link( the remainder, less the
signaling, routing , etc.. will go into data queues) do I allow my non voice traffic to utilize the full port speed ?
Or since I'm not specifying a burst will it max out at the CIR of 768 ?
I obviously do not want my voice traffic to be dropped by the SP, however I want my data traffic to be able to burst up to the port speed
without paying the full CIR .
??
TIA
Regards,
Dave
______________________________________________
Architecture & Engineering
Work: (973) 682-4435
Cell: (973)907-4963
"asadovnikov"
<asadovnikov@comc To: Dave Meyer/NewYork/DBNA/DeuBa@DBNA
ast.net> cc: <ccielab@groupstudy.com>
Subject: RE: OT - Frame relay QOS
08/25/2004 07:56
PM
Dave,
Cisco recommendation is to have CIR from you provider equal to your shaping
rate, in other words CIR would be equal voice + data, not just voice. The
logic behind such recommendation is that after frames go into the cloud
provider can discard anything above CIR and they will not be able to say if
it is a voice frame or a data frame, so if you shape above CIR you subject
your voice frames to a risk of the drop by your provider, and voice calls
can not sustain any significant rate of packet drops.
I happen to agree with Cisco recommendation in this case and have seen very
negative results when people have to tried to do otherwise (not to say that
your experience with a particular provider will be the same).
Best Regards,
Alexei
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Dave
Meyer
Sent: Wednesday, August 25, 2004 3:29 PM
To: mani poopal <mani_ccie
Cc: ccielab@groupstudy.com
Subject: Re: OT - Frame relay QOS
Hi Mani,
If I use a CIR=LLQ to for the voice( and not allowing to burst ) do I
waste the potential BW of the link ?
" The Frame Relay excess burst (Be) value is not set and therefore defaults
to 0, preventing any bursting over CIR. This is the recommended
configuration for traffic shaping when carrying VoIP "
Regards,
Dave
______________________________________________
Architecture & Engineering
Work: (973) 682-4435
Cell: (973)907-4963
mani poopal <mani_ccie@yahoo.com>
08/25/2004 03:20 PM
To: Dave Meyer/NewYork/DBNA/DeuBa@DBNA, ccielab@groupstudy.com
cc:
Subject: Re: OT - Frame relay QOS
Hi Dave,
If you have enough bandwidth under CIR by using LLQ(under class based WFQ)
the bandwidth is guaranteed for VoIP traffic. You can also use ip rtp
priotiy 16384 16383 command instead of LLQ(this method is not preferred
method by cisco)
Mani
Dave Meyer <dave.meyer@db.com> wrote:
Just wanted to get some opinions on this.........
Currently have FR circuits with 0 CIR & would like to implement VOIP.
If we purchased a CIR = amount we expect to reserve for VOIP ( no
signaling) , and assigned the appropriate LLQ,
would we expect the voice traffic to be guaranteed by the CIR ?
Regards,
Dave
______________________________________________
Architecture & Engineering
Work: (973) 682-4435
Cell: (973)907-4963
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