By Ramji Balakrishnan
Advanced QoS for Multi-Service IP/MPLS Networks is the definitive advisor to caliber of carrier (QoS), with entire information regarding its gains and merits. discover a sturdy theoretical and functional review of the way QoS may be carried out to arrive the company ambitions outlined for an IP/MPLS community. subject matters contain usual QoS versions for IP/MPLS networks, crucial QoS good points, forwarding periods and queuing priorities, buffer administration, multipoint shared queuing, hierarchical scheduling, and fee restricting. This publication will assist you create a fantastic QoS architecture/design, that is crucial for prioritizing prone during the community
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Additional info for Advanced QoS for multi-service IP/MPLS networks
Note: Because service routers can support different media interfaces, including Ethernet, SONET, Asynchronous Transfer Mode (ATM), and Frame-Relay, the word datagram is used to refer to all types of trafﬁc that can ﬂow through a network using service routers. As such, in this book, the word datagram is used to collectively refer to packets, frames, and cells. QoS allows the service provider to utilize a network infrastructure for offering multiple application services, thereby saving the capital and operating costs involved in maintaining multiple networks for each of the applications separately.
Qxd 4/8/08 4:12 PM Page 14 Datagram Loss RFC2680 and RFC3357 have deﬁned metrics for measuring one-way trafﬁc loss. Trafﬁc loss characterizes the datagram drops that occur in the path of a one-way trafﬁc ﬂow between two reference points: one at the beginning as the trafﬁc enters a network and the other at the end as the trafﬁc leaves the network. Although having buffer space to temporarily queue datagrams in network nodes helps reduce datagram loss, it cannot be completely eliminated. Some of the factors that contribute to datagram loss are: • Congestion—Bursty trafﬁc can cause queue overﬂows resulting in datagram loss.
The chapters in Part 1 walk you through the need for QoS, the enhancements offered by service routers from a QoS perspective, and the QoS models standardized by IETF. They describe the QoS support built into different Layer 2 and Layer 3 technologies, and the functions of fundamental QoS features. qxd 4/8/08 4:12 PM Page 3 The Need for Quality of Service 1 QoS is an integral set of features in a service router, which can help service providers exceed service level agreements for the different application trafﬁc types carried over a multi-service network.
Advanced QoS for multi-service IP/MPLS networks by Ramji Balakrishnan