Quality of Service (QoS)
©2008 Allied Telesis Inc. All rights reserved.
Software Version 5.2.1
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
39.7
Applying QoS on Your Switch
This section steps you through the various stages of QoS set-up and introduces the QoS
commands and how to apply them. Note that before you can configure any QoS functions on
your switch, you must first enable QoS by using the
mls qos enable command on page 40.18
.
Classifying your Data
One of the early steps in setting up QoS on a network is planning and applying your
classification rules. Classification is the process of,
Filtering
and
Marking.
Filtering involves sorting
your data into appropriate traffic types. Marking involves tagging the data so that downstream
ports and routers can apply appropriate service policy rules. This process is known as
premarking.
Figure 39-4
illustrates the classifying process, and will be referred to in the
examples that follow.
Figure 39-4: QoS Classification
At the premarking stage you can assign your data a particular priority level by giving it a link
level user priority, see
“Link Layer QOS” on page 39.3
, or a network level DSCP
“Differentiated Services Architecture” on page 39.4
. You can also assign the data to a
particular output (or egress) queue.
Class Maps
Class Maps are among the pivotal QoS components. They provide the means that associate
the classified traffic with its appropriate QoS actions. They are the linking elements for the
following functions:
■
classification
■
policy mapping
■
aggregate policing and metering
■
pre-marking
QoS Classificatio
n
mls qos enable
Enables qos on the switch
match <access group>
Assigns vlan matching to one or
more a class maps
match <cos>
Assigns vlan matching to one or
more a class maps
match <inner-cos>
Assigns vlan matching to one or
more a class maps
match <ip-dscp>
Assigns vlan matching to one or
more a class maps
match <ip-precedence>
Assigns vlan matching to one or
more a class maps
match <mac-type>
Assigns vlan matching to one or
more a class maps
match <protocol>
Assigns vlan matching to one or
more a class maps
match <tcp-flags>
Assigns vlan matching to one or
more a class maps
match <tpid>
Assigns vlan matching to one or
more a class maps
match <inner-tpid>
Assigns vlan matching to one or
more a class maps
ip access-group
<3000-3699>
mac access-group
<4000-4699>
Apply Access
Matching Criteria
match <vlan>
Assigns vlan matching to one or
more a class maps
class-map <name>
Creates a class map
class-map
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