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Chapter 5: Using the Web-based Utility for Configuration
QoS
WebView Switches
•
Broadcast Only
. Counts only Broadcast traffic.
Rate Threshold.
The maximum rate (packets per second) at which unknown packets are forwarded. The default
value is 3500. The range is 70 -100000.
QoS
Network traffic is usually unpredictable, and the only basic assurance that can be offered is best effort traffic
delivery. To overcome this challenge, Quality of Service (QoS) is applied 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
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 traffic-classes, 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.
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