xStack
®
DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
173
Section 4
QoS
Bandwidth Control
QoS Scheduling Mechanism
QoS Output Scheduling
802.1p Default Priority
802.1p User Priority
QoS
The xStack
®
DGS-3400 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.
The 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
xStack
®
DGS-3400 switch series implements basic 802.1p priority queuing.
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