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Page 11 | AlliedWare Plus™ OS: Overview of QoS
Diagram of the overall QoS process flow
The following figure summarises the QoS process flow and the commands to configure each
stage. The following sections describe the configuration in detail.
trust dscp (& set dscp)
From L2 switch
class-map
premarking
Look up
mark-DSCP map
Markers updated:
CoS, DSCP,
Bw Class, queue
Tagged packets: set egress queue
based on 802.1p, using
mls qos map cos-queue
Marker updated:
Egress Queue
Policing
Marker updated:
Temporary Bw Class
Drop
red
packets
Routing
Red Curves
Egress Queuing
Untagged packets:
set egress queue based on
mls qos queue and CoS
based on mls qos cos
Markers updated:
Egress Queue, CoS
When using trust dscp alone,
packets must have a DSCP value
for QoS to use to look up the map.
When using trust dscp and set dscp
together, set dscp specifies
the look-up value.
Use user-specified
values
Markers updated:
CoS, DSCP,
Bw Class, queue
setting
set dscp, cos, etc
none
drop
policer
exceed-action
setting
policed-dscp-transmit
Look up
policed-DSCP map
Markers updated:
CoS, DSCP,
Bw Class, queue
green and yellow packets
QoS1.eps