One major carrier (Sprint) does not provide a guaranteed CIR but rather uses zero CIR in all applications including voice/IP. They state that their port is guaranteed at 99.9% on whatever traffic is offered to it. Therefore, I am confused and hope you can clarify the CIR and packet eligible/discard eligible controversy.
People wanting a lower likelihood of dropped packets will want to obtain a service level agreement for a specific CIR. If a business is sending important data or VoIP traffic across a Frame Relay interface, they will typically want to use a separate data link connection identifier (DLCI) which has its own CIR.
When the network becomes congested, the carrier will discard frames with the DE bit set before discarding those that do not. The carrier can discard frames without the DE bit set if the congestion level completely overwhelms their equipment. This, however, is a very unlikely event. That is why you would still pay more for a 'guaranteed' CIR.
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