User Manual User Manual

Rockwell Automation Publication 1783-UM001D-EN-P - January 2013 65
Switch Management Chapter 4
QoS Setup
QoS (quality of service) provides for the classification of Ethernet traffic into
high and low priority queues. High priority packets are forwarded to their
destination address before a low priority packet.
Packets can be classified as high or low by MAC address, 802.1p priority tag,
and/or port ID.
To access QoS setup, from the navigation pane, expand the Switch Configuration
folder and click QoS Setup.
Note these options:
• Port-based Priority—When changed to High, the incoming traffic for that
port is considered high priority.
• High/Low Quality Weight—Establishes the algorithm for switching
between high and low priority queues. The default value of 15/1 sends 15
packets of high priority traffic, then sends 1 packet of low priority traffic.
• MAC-based Priority—Incoming packets are cross referenced with the
MAC based QoS list and put into the high priority queue if the
destination address is on the list.
• 802.1p Priority—Each incoming packet is examined for a valid 802.1p
priority tag. If present, the packet is put in the high priority queue if the
priority tag exceeds the QoS Priority Threshold.
WARNING: I/O devices do not support the QoS protocol.