Configuration Guide 434
Configuring QoS QoS
1
QoS
1.1 Overview
With network scale expanding and applications developing, Internet traffic is dramatically
increased, thus resulting in network congestion, packet drops and long transmission
delay. Typically, networks treat all traffic equally on FIFO (First In First Out) delivery basis,
but nowadays many special applications like VoD, video conferences, etc. require more
bandwidth or shorter transmission delay to guarantee the performance.
With QoS (Quality of Service) technology, you can classify and prioritize network traffic to
provide DiffServ (Differentiated Services) to certain types of traffic.
1.2 Supported Features
You can configure the DiffServ and bandwidth control features on the switch to maximize
the network performance and bandwidth utilization.
DiffServ
The switch classifies the ingress packets, maps the packets to different priority queues
and then forwards the packets according to specified scheduling algorithms to implement
QoS function.
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Priority Mode: Three modes are supported, Port Priority, 802.1P Priority and DSCP
Priority.
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Schedule Mode: Four schedule modes are supported, SP, WRR, SP+WRR and Equ.
Bandwidth Control
Bandwidth Control functions to control the traffic rate and broadcast flow on each port to
ensure network performance.
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Rate limit functions to limit the ingress/egress traffic rate on each port. In this way, the
network bandwidth can be reasonably distributed and utilized.
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Storm Control function allows the switch to filter broadcast packets, multicast packets
and UL-frames (Unknown unicast frames) in the network. If the transmission rate of
the packets exceeds the set rate, the packets will be automatically discarded to avoid
network broadcast storm.
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