Comtrol ES8508 Series User Guide - Manual (Page 100)

100 - Traffic Prioritization RocketLinx ES8508 Series User Guide: 2000575 Rev. A
Configuration Using the Web Interface
Traffic Prioritization
Quality of Service (QoS) provides a traffic prioritization mechanism which allows you to deliver better service
to certain flows. QoS can also help to alleviate congestion problems and ensure high-priority traffic is
delivered first. This section allows you to configure Traffic Prioritization settings for each port with regard to
setting priorities.
The ES8508 QoS supports four physical queues, weighted fair queuing (WRR) and Strict Priority scheme, that
follows the IEEE 802.1p CoS tag and IPv4 TOS/DiffServ information to prioritize the traffic of your industrial
network.
The following web pages are included in this group:
• QoS Setting
• CoS-Queue Mapping on Page 101
• DSCP-Queue Mapping on Page 102
Optionally, you can use the CLI for configuration, see Traffic Prioritization (CLI) on Page 171.
QoS Setting
Use this subsection to set up QoS settings for the ES8508.
QoS Setting Page
Use an 8,4,2,1
weighted fair
queuing scheme
This is also known as WRR (Weight Round Robin). The ES8508 follows the 8:4:2:1 rate to
process the packets in a queue from the highest priority to the lowest. For example, the
system processes 8 packets with the highest priority in the queue, 4 with middle priority,
2 with low priority, and 1 with the lowest priority at the same time.
Use a strict
priority scheme Packets with higher priority in the queue are always processed first, except that there is
no packet with higher priority.
CoS
The CoS column indicates that the default port priority value for untagged or priority-
tagged frames. When the ES8508 receives the frames, the ES8508 attaches the value to
the CoS field of the incoming VLAN-tagged packets. You can enable 0,1,2,3,4,5,6 or 7 to
the port.