Allied Telesis Rapier i AT-RP16Fi/SC, User Manual

Page: 88 / 123

88 Rapier Switch User Guide
Software Release 2.6.1
C613-02025-00 REV C
To display the mapping of user priority to QOS egress queues, use the
command:
SHOW SWITCH QOS
Figure 18: Example output from the SHOW SWITCH QOS command
Rapier i Series switches include full QoS functionality, including
■
policies, to provide a QoS configuration for a port or ports
■
traffic classes, for bandwidth limiting and user prioritisation
■
maximum bandwidth limiting on a traffic class
■
flow groups within traffic classes, for user prioritisation
■
control of the egress scheduling algorithm
■
priority relabelling of frames, at Layer 2, by replacing the VLAN tag User
Priority field
■
class of service relabelling of frames, at Layer 3, by replacing the DSCP
(DiffServ Code Point) or the TOS precedence value in the IP header’s Type
of Service (TOS) field
Priority Level QOS egress queue
-------------------------------------
0 ................... 1
1 ................... 0
2 ................... 0
3 ................... 1
4 ................... 2
5 ................... 2
6 ................... 3
7 ................... 3
Table 14: Parameters in the output of the SHOW SWITCH QOS command
Parameter Meaning
Priority level The priority level of the frame.
QOS egress queue The Quality Of Service egress queue that frames with this
priority level join.
Table 15: The different QoS-type controls available on the switch.
Command set Use for Do not use for
QoS Bandwidth limiting of classified traffic flows.
Priority queueing of classified traffic flows.
Replacing TOS or DSCP byte of IP header.
Replacing User Priority in VLAN tag header.
Providing a coordinated QoS solution for a port or
ports, using the QoS policy model.
Configuring a DiffServ domain.
Limiting total bandwidth on a port, unless
other QoS controls are also required.