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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
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Section 9
QoS
Bandwidth Control
QoS Scheduling Mechanism
QoS Output Scheduling
802.1P Default Priority
802.1P User Priority
WRED Settings
The DES-3800 Series supports 802.1p priority queuing Quality of Service. The following section discusses the implementation of
QoS (Quality of Service) and benefits of using 802.1p priority queuing.
Advantages of QoS
QoS is an implementation of the IEEE 802.1p standard that allows network administrators a method of reserving bandwidth for
important functions that require a large bandwidth or have a high priority, such as VoIP (voice-over Internet Protocol), web
browsing applications, file server applications or video conferencing. Not only can a larger bandwidth be created, but other less
critical traffic can be limited, so excessive bandwidth can be saved. The Switch has separate hardware queues on every physical
port to which packets from various applications can be mapped to, and, in turn prioritized. View the following map to see how the
DES-3800 Series implements 802.1P priority queuing.
Figure 9- 1. Mapping QoS on the Switch