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Rate Management Mechanisms in Switch/Routers
Published in James Aweya, Designing Switch/Routers, 2023
The trTCM defines two bandwidth limits (one for guaranteed traffic and one for peak traffic) and two burst sizes (one for each of the bandwidth limits) [RFC2698] [RFC4115]. The policer meters a traffic stream based on the following configured traffic criteria:Committed Information Rate (CIR): This is the bandwidth limit for guaranteed traffic.Committed Burst Size (CBS): This is the maximum amount of data permitted for traffic bursts that exceed the CIR.Peak Information Rate (PIR): This is the bandwidth limit for peak traffic. The PIR specifies the maximum rate at which traffic is admitted into the network and must be greater than or equal to the CIR.Peak Burst Size (PBS): This is the maximum amount of data permitted for traffic bursts that exceed the PIR.A trTCM meters traffic flow against a bandwidth limit (CIR) and burst-size limit for guaranteed traffic (CBS), plus a bandwidth limit (PIR) and burst-size (PBS) limit for peak traffic. The trTCM is so-called because traffic is policed according to two rates: the CIR and the PIR.
Twenty-first century transport: SNG over IP
Published in Jonathan Higgins, Satellite Newsgathering, 2012
It is also necessary to consider the issue of ‘contention’. A public broadband connection is typically sharing a restricted amount of bandwidth between 20, 50 or 100 users, depending on the limitations of the service. In practice this means that at certain times of the day, the available bandwidth drops as the number of users sharing the overall data bandwidth increases. This leads us to the terms Committed Information Rate (CIR) and Burst Information Rate (BIR). On some networks – typically large private networks – routers may have a CIR assigned, which is the minimum guaranteed data rate. Often a BIR is also defined, which is the maximum data rate that the router has access to if there is the capacity available. These CIR and BIR parameters are important when considering the streaming of live video.
12 Private Networks Secure and Transport
Published in Wes Simpson, Video Over IP, 2013
Frame Relay connections are priced partly on the basis of the Committed Information Rate (CIR) and partly on the basis of the access link speed. The CIR is a data rate selected by the customer that the carrier promises will be available at all times to the customer. Customers are allowed to send more data than their CIR rate; however, the network can delete any frames in excess of the CIR at any time. Higher-level protocols (such as TCP) can correct for these lost frames, so customers usually choose to keep their CIR as low as possible. For networks with heavy video usage, it might be necessary to pay for a CIR that is greater than the expected video signal rate to ensure that adequate network capacity is available.
A Survey on Packet Switching Networks
Published in IETE Journal of Research, 2022
Furthermore, the excellent performance of the network and low data latency caused by variable-length frames and low overhead. The variable-length frames make it easy to encapsulate protocols. Since frame relay is protocol agnostic, it can contain many LAN protocols of higher layers, such as the Internet protocol (IP) in its data. The frame relay network has a low overhead since it does not have to worry about error correction or flow management – another advantage of frame relay CIR, which is an abbreviation of Committed Information Rate. As mentioned earlier, the CIRs are the traffic levels of the data that the network handles under typical network situations; these CIRs are agreed upon by the service provider (SPs) and the subscriber. The consumer benefits from a CIR since, once agreed upon as the SP should be able to transmit at or below the CIR [14].