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Chapter 5: Using the Web-based Utility for Configuration
QoS Tab
24-Port 10/100/1000 Gigabit Switch with Webview and PoE
QoS Tab
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.
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.
QoS Tab - CoS Settings
Class of Service (CoS) allows you to specify which data packets have greater precedence when traffic is buffered
in the Switch due to congestion. The Switch supports CoS with four priority queues for each port. Data packets in
a port’s high-priority queue will be transmitted before those in the lower-priority queues. You can set the default
priority for each interface, and configure the mapping of frame priority tags to the Switch’s priority queues.The
priority levels recommended in the IEEE 802.1p standard for various network applications are shown in the
following table. However, you can map the priority levels to the Switch’s output queues in any way that benefits
application traffic for your own network.
The CoS Settings screen contains fields for enabling or disabling CoS. In addition, the Trust mode can be selected.
The Trust mode relies on predefined fields within the packet to determine the egress queue settings.
Priority Level
Traffic Type
1
Background
2
(Spare)0(default) Best Effort
3
Excellent Effort
4
Controlled Load
5
Video, less than 100 milliseconds latency and jitter
6
Voice, less than 10 milliseconds latency and jitter
7
Network Control
Figure 5-35: QoS - CoS Settings
Summary of Contents for SRW2024P
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