Zero CIR Frame Relay Voice

Unanswered Question

I have a remote site with Frame with a 1.5 mb circuit no/zero CIR from Sprint. The Hub site has a 12 mb FR Circuit.

Remote Site Traffic Shaping is as follows:

map-class frame-relay Data-Voip

frame-relay cir 1536000

frame-relay bc 15360

frame-relay be 0

frame-relay mincir 1536000

frame-relay fragment 1600 --- Dual FIFO

service-policy output Voip

Service Policy is set to priority 50% for Voice EF traffic bandwidth 64k for voice control.

sho frame-relay pvc output shows shaping inactive and sho traffic-shape stat output shows all sub interfaces except the site which has voice and traffic shaping applied.

What should the min cir value as above "frame-relay mincir 1536000" be set to zero, based on provider info all traffic is marked DE.

Has anyone else exp. high jitter with voice with zero cir FR circuits.


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Overall Rating: 5 (1 ratings)
sundar.palaniappan Thu, 03/22/2007 - 13:47
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Your mincir value should be set to 0.

Also, lower the fragment size substantially avoid serialization delay on the link.



dgahm Thu, 03/22/2007 - 17:00
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You are not going to be happy running voice over a 0 CIR circuit unless your provider is setting it up to do so.

Some providers sell a Frame Relay service of 0 CIR. Obviously, not exceeding CIR in this case would prevent any voice from being sent across the frame link. A service of 0 CIR may be used for voice but there needs to be a Service Level Agreement (SLA) with the provider to guarantee minimal delay and jitter for a certain bandwidth across the 0 CIR PVC

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