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4. Quality of Service
This chapter contains the following topics:
• QoS Overview
• Rate Limiting
• Broadcast Filtering
QoS Overview
There are many different classes of data that can be sent across a network. Depending on
the volume of traffic on the network and the capacity of the equipment in the network, data
can be delayed, or lost and retransmitted before reaching its destination. Normally this is not
a problem since the data is reassembled at the destination.
If the data consists of text or numeric data to be stored on the destination computer, the user
would not notice the delay. But if the data was voice, streaming video, or other delay
sensitive data, delays would be undesirable. Video sequences would be jerky and voice
communication would have annoying gaps.
The QoS (Quality of Service) feature in the ProSafe Plus switches allows you to control the
flow of data passing through the switch.
• QoS global configuration. Assigns priorities to data.
• Rate Limit. Sets limits on transmission rates for data passing through the switch.
• Broadcast Filtering. Blocks mass transmissions of broadcast packets from being
forwarded to all ports.