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Figure 7-3 Frame relay service delivery
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In frame relay, PVCs are identified using an address called a Data Link Connection Identifier, or DLCI (pronounced delsie ). At any given endpoint, the customer s router can support multiple DLCIs, and each DLCI can be assigned varying bandwidths based upon the requirements of the device/application on the router port associated with that DLCI. In Figure 7-3, the customer has purchased a T1 circuit to connect his router to the frame-relay network. The router is connected to a videoconferencing unit at 384 Kbps, a frame-relay-capable PBX at 768 Kbps, and a data circuit for Internet access at 512 Kbps. Note that the aggregate bandwidth assigned to these devices exceeds the actual bandwidth of the access line by 128 Kbps (1,664 1,536). Under normal circumstances this would not be possible, but frame relay assumes that the traffic that it will normally be transporting is bursty by nature. If the assumption is correct (and it usually is), there is very little likelihood that all three devices will burst at the same instant in time. As a consequence, the circuit s operating capacity can actually be overbooked, a process known as oversubscription. Most service providers allow as much as 200 percent oversubscription, something customers clearly benefit from, provided the circuit is designed properly. This means that the salesperson must carefully assess the nature of the traffic that the customer will be sending over the link and ensure that enough bandwidth is allocated to support the requirements of the various devices that will be sharing access to the link. Failure to do so can result in an underengineered facility that will not meet the customer s throughput requirements. This is a critical component of the service delivery formula.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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The throughput level, that is, the bandwidth that frame-relay service providers absolutely guarantee on a PVC-by-PVC basis, is called the committed information rate (CIR). In addition to CIR, service providers will often support an excess information rate (EIR), which is the rate above the CIR they will attempt to carry, assuming the capacity is available within the network. However, all frames above the CIR are marked as eligible for discard, which simply means that the network will do its best to deliver them but makes no guarantees. If push comes to shove, and the network finds itself to be congested, the frames marked discard eligible (DE) are immediately discarded at their point of ingress. This CIR/EIR relationship is poorly understood by many customers because the CIR is taken to be an indicator of the absolute bandwidth of the circuit. Whereas bandwidth is typically measured in bits per second, CIR is a measure of bits in one second. In other words, the CIR is a measure of the average throughput that the network will guarantee. The actual transmission volume of a given CIR may be higher or lower than the CIR at any point in time because of the bursty nature of the data being sent, but in aggregate the network will maintain an average, guaranteed flow volume for each PVC. This is a selling point for frame relay. In most cases, customers get more than they actually pay for, and as long as the switch loading levels are properly engineered, the switch (and therefore the frame-relay service offering) will not suffer adversely from this charitable bandwidth-allocation philosophy. The key to success when selling frame relay is to have a very clear understanding of the applications the customer intends to use across the link so that the access facility can be properly sized for the anticipated traffic load.
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