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4.8 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. And Cos Settings, Queue
settings, Dscp Settings, Bandwidth, Basic Mode, Advanced mode are provided.
4.8.1 CoS Settings
The terms Class of Service (CoS) and QoS are used in the following:
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.
The CoS Settings screen (see figure 4-37) 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. (To configure the
Trust Mode, see 4.8.5.)
The CoS Settings screen has two areas, CoS Settings and CoS to Queue.
• Multicast & Broadcast, counts Broadcast and Multicast traffic together.
• Broadcast Only, counts only Broadcast traffic.
Where the maximum rate (packets per second) at which unknown packets are
forwarded. The range is 70 -100000.
The default value is 3500.
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User's Manual of WGSW-24020/WGSW-48040
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