Deploying IP and MPLS QoS for Multiservice Networks: Theory by John William Evans, Clarence Filsfils

By John William Evans, Clarence Filsfils

QoS, brief for "quality of service," is without doubt one of the most crucial targets a community clothier or administrator could have. making sure that the community runs at optimum precision with information final exact, touring quick, and to the right kind consumer are the most pursuits of QoS. a number of the media that fly around the community together with voice, video, and knowledge have assorted idiosyncrasies that attempt the scale of the community. This malleable community structure poses an consistently relocating capability challenge for the community professional.The authors have supplied a accomplished treatise in this topic. they've got integrated subject matters similar to site visitors engineering, ability making plans, and admission keep watch over. This e-book presents actual global case reports of QoS in multiservice networks. those case experiences eliminate the secret at the back of QoS by means of illustrating the how, what, and why of imposing QoS inside networks. Readers should be in a position to examine from the successes and screw ups of those real operating designs and configurations. *Helps readers comprehend recommendations of IP QoS by way of offering transparent descriptions of QoS elements, architectures, and protocols*Directs readers within the layout and deployment of IP QoS networks via totally defined examples of tangible operating designs*Contains actual existence case reports which specialize in implementation

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Additional info for Deploying IP and MPLS QoS for Multiservice Networks: Theory & Practice (The Morgan Kaufmann Series in Networking)

Sample text

Path capacity. 2 SLA Metrics 13 egress point, consisting of a number of links interconnected by a number of nodes or routers. [CHIMENTO] also provides definitions for link and path capacity. Path capacity may also be referred to as the path bandwidth. ● Bulk Transport Capacity. The Bulk Transport Capacity (BTC) is a measure of the attainable user data throughput between a source and a destination; [RFC3148] specifies a framework for Defining Empirical Bulk Transfer Capacity Metrics. g. in bits per second) a single congestion-aware transport layer connection could achieve over the path from source to destination.

While there are clearly too many applications to describe them all, we consider the most common applications or application types, which impose the tightest SLA requirements on the network. In practice, most applications that have explicit SLA requirements will fall 26 Chapter 1 QOS Requirements and Service Level Agreements into one of the following categories, or will have SLA requirements, which are similar to one of those categories described: ● voice over IP ● video streaming ● video conferencing ● throughput-focussed TCP applications ● interactive data applications ● on-line gaming.

Whichever approach is adopted, the SLA specification must clearly define which overheads are taken into account and to which layer the bandwidth assurances apply. This has a consequent impact on the overheads that QOS functions such as scheduling, shaping, or policing need to take into account. 2 VPN Hose and Pipe Models Consider a network connecting four sites (#1, #2, #3 and #4); this could be a layer 2 virtual private network (VPN) offered by a service provider using a technology such as leased lines, Frame-relay or ATM, for example.

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