Advanced QoS for multi-service IP/MPLS networks by Ramji Balakrishnan

By Ramji Balakrishnan

Advanced QoS for Multi-Service IP/MPLS Networks is the definitive consultant to caliber of carrier (QoS), with finished information regarding its good points and advantages. discover a strong theoretical and useful assessment of the way QoS might be applied to arrive the enterprise targets outlined for an IP/MPLS community. issues comprise normal QoS versions for IP/MPLS networks, crucial QoS positive factors, forwarding periods and queuing priorities, buffer administration, multipoint shared queuing, hierarchical scheduling, and fee proscribing. This e-book will assist you to create a pretty good QoS architecture/design, that's needed for prioritizing providers in the course of the community

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Advanced QoS for multi-service IP/MPLS networks

Complicated QoS for Multi-Service IP/MPLS Networks is the definitive consultant to caliber of provider (QoS), with accomplished information regarding its positive factors and merits. discover a sturdy theoretical and functional evaluation of the way QoS will be carried out to arrive the enterprise goals outlined for an IP/MPLS community.

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Note: The DSCP markings suggested for different PHBs are only recommendations, and they are not mandatory. Therefore, if a nonrecommended DSCP marking is used along with a PHB, it does not make the QoS design noncompliant with DiffServ. The key to achieving the service requirement of an application’s traffic is that there is consistency in the mapping between the associated DSCP marking and the PHB offered throughout the data path of the traffic. The DiffServ working group has defined four PHBs so far: Expedited Forwarding (EF), Assured Forwarding (AF) group, Class Selector (CS), and the default PHB.

Service requirements of common application traffic are explained in Chapter 14. The ability of a network to recognize the diverse service requirements of different types of applications and to provide the service appropriately is the essence of quality of service. See Chapter 5 for an overview of how end-to-end traffic management is enforced over a traffic flow path within an ALSRP network in order to achieve the SLA associated with the traffic. Summary Quality of service refers to the ability of a network to recognize the differing service requirements of different application traffic flowing through it and to comply with service level agreements negotiated for each of the application services.

As specified in RFC3357, for some real-time applications (such as streaming video traffic), certain datagram loss characteristics are more important than the actual number of datagrams lost: • Loss distance—The difference in the sequence number between two successively lost packets (which may or may not be separated by successfully received packets). • Loss period—The duration of a loss or error event once it starts. In other words, loss period is defined as the frequency at which loss occurs and the number of consecutive packets dropped each time loss occurs.

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