Operation Manual

Quality of Service Commands 7 – 85
7
Quality of Service Commands
Use Quality of Service (QoS) commands to configure packet prioritization in MSS. Packet
prioritization ensures that MX switches and MPs give preferential treatment to high-priority
traffic such as voice and video.
(To override the prioritization for specific traffic, use access controls lists [ACLs] to set the Class
of Service [CoS] for the packets. See Chapter , “Security ACL Commands,” on page 391.)
This chapter presents QoS commands alphabetically. Use the following table to locate commands
in this chapter based on their use.
clear qos
Resets the MX mapping of Differentiated Services Code Point (DSCP) values to internal QoS
values.
The MX internal QoS map ensures that prioritized traffic remains prioritized while transiting the
MX. An MX uses the QoS map to do the following:
❑ Classify inbound packets by mapping the DSCP values to one of eight internal QoS values
❑ Classify outbound packets by marking the DSCP values based on the MX internal QoS values
Syntax clear qos
[cos-to-dscp-map [from-qos] | dscp-to-cos-map [from-dscp]| [flow sip-data]|
[traffic-class voip-data]]
Defaults None.
Access Enabled.
QoS Settings show qos on page 7-88
show qos dscp-table on page 7-89
Updated set qos cos-to-dscp-map on page 7-86
set qos dscp-to-cos-map on page 7-87
set qos flow on page 7-87
Updated set qos flow on page 7-87
set qos traffic-class on page 7-87
clear qos on page 7-85
clear qos-profile on page 7-86
cos-to-dscp-map
[from-qos]
Resets the mapping between the specified internal QoS value and the DSCP
values with which MSS marks outbound packets.
QoS values are from 0 to 7.
dscp-to-cos-map
[from-dscp]
Resets the mapping between the specified range of DSCP values and internal
QoS value with which MSS classifies inbound packets.
flow
sip-data
Resets the flow of SIP data.
traffic-class
voip-data
Resets the traffic class.