Traffic Prioritization; Qos Policy - Emerson PACSystems SLM080 User Manual

PACSystems Ethernet Switch SLM080 User Manual
GFK-3125A
5.2.6

Traffic Prioritization

Traffic Prioritization includes 3 modes: port base, 802.1p/COS, and TOS/DSCP. By traffic prioritization
function, you can classify the traffic into four classes for differential network application.
5.2.6.1

Qos policy

Figure 34: Policy
The following table describes the labels in this screen.
Label
QOS Mode
QOS policy
Apply
Help
Web Management
Description
 Port-base: the output priority is determined by ingress
port.
 COS only: the output priority is determined by COS only.
 TOS only: the output priority is determined by TOS only.
 COS first: the output priority is determined by COS and
TOS, but COS first .
 TOS first: the output priority is determined by COS and
TOS, but TOS first .
 Using the 8,4,2,1 weight fair queue scheme: the output
queues will follow 8:4:2:1 ratio to transmit packets from
the highest to lowest queue. For example: 8 high queue
packets,
4 middle queue packets, 2 low queue packets, and the one
lowest queue packets are transmitted in one turn.
 Use the strict priority scheme: always the packets in
higher queue will be transmitted first until higher queue is
empty.
Click " Apply " to set the configurations.
Show help file.
Section 5
Jan 2020
48