Dell PowerConnect 6024 User's Guide (.htm) - Page 411
Configuring Quality of Service, Quality of Service Overview, Quality of Service
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Configuring Quality of Service The Quality of Service page contains links to the main QoS configuration pages. To open the page, click Quality of Service in the tree view. Quality of Service Overview Network traffic is usually unpredictable, and the only basic assurance that a network administrator can offer is best effort traffic delivery. To overcome this challenge, network administrators apply Quality of Service (QoS) throughout the network. This ensures that network traffic is prioritized according to specified criteria, and that specific traffic receives preferential treatment. QoS in the network optimizes network performance and entails two basic facilities: • Classifying incoming traffic into handling classes, based on an attribute, including: - The ingress interface - Packet content - A combination of these attributes • Providing various mechanisms for determining the allocation of network resources to different handling classes, including: - The assignment of network traffic to a particular hardware queue - The assignment of internal resources - Traffic shaping In this document, the terms Class of Service (CoS) and QoS are used in the following context: • CoS provides varying Layer 2 traffic services. CoS refers to classification of traffic to trafficclasses, which are handled as an aggregate whole, with no per-flow settings. CoS is usually related to the 802.1p service that classifies flows according to their Layer 2 priority, as set in the VLAN header. • QoS refers to Layer 2 traffic and above. QoS handles per-flow settings, even within a single traffic class. The QoS facility involves the following elements: • Access Control Lists (ACLs) - Used to decide which traffic is allowed to enter the system, and which is to be dropped. Only traffic that meets this criteria are subject to CoS or QoS settings. ACLs are used in QoS and network security. • Traffic Classification - Classifies each incoming packet as belonging to a given traffic class, based on the packet contents and/or the context. Configuring Quality of Service 421
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