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Example: Configuring Priority Scheduling
This example shows how to configure priority scheduling so important traffic receives better access to the outgoing interface.
Requirements
Before you begin, review how to assign forwarding classes. See Example: Assigning Forwarding Classes to Output Queues.
Overview
In this example, you configure CoS and a scheduler called be-sched with a medium-low priority. Then you configure scheduler map be-map to associate be-sched with the best-effort forwarding class. Finally, you apply be-map to interface ge-0/0/0.
Configuration
Procedure
CLI Quick Configuration
To quickly configure this example, copy the
following commands, paste them into a text file, remove any line breaks,
change any details necessary to match your network configuration,
copy and paste the commands into the CLI at the [edit] hierarchy
level, and then enter commit from the configuration mode.
set class-of-service schedulers be-sched priority medium-low set class-of-service scheduler-maps be-map forwarding-class best-effort scheduler be-sched set class-of-service interfaces ge-0/0/0 scheduler-map be-map
Step-by-Step Procedure
The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode in the Junos OS CLI User Guide.
To configure priority scheduling:
Configure CoS and a scheduler.
[edit] user@host# edit class-of-service user@host# edit schedulers be-sched
Set a priority.
[edit class-of-service schedulers be-sched] user@host# set priority medium-low
Configure a scheduler map.
[edit] user@host# edit class-of-service user@host# edit scheduler-maps be-map
Specify the best-effort forwarding class.
[edit class-of-service scheduler-maps be-map] user@host# set forwarding-class best-effort scheduler be-sched
Apply best-effort map to an interface.
[edit] user@host# edit class-of-service user@host# set interfaces ge-0/0/0 scheduler-map be-map
Results
From configuration mode, confirm your configuration
by entering the show class-of-service command. If the output
does not display the intended configuration, repeat the configuration
instructions in this example to correct it.
[edit]
user@host# show class-of-service
interfaces {
ge-0/0/0 {
scheduler-map be-map;
}
}
scheduler-maps {
be-map {
forwarding-class best-effort scheduler be-sched;
}
}
schedulers {
be-sched {
priority medium-low;
}
}
If you are done configuring the device, enter commit from configuration mode.