class (Forwarding Classes)
Syntax for QFX Series Routers
class {
class-name {
pfc-priority pfc-priority;
queue-num queue-number <no-loss>;
}
}
Syntax for MX Series routers and EX Series switches
class {
class-name {
queue-num queue-number ;
priority (high | low) ;
}
}
Hierarchy Level
[edit class-of-service forwarding-classes]
Description
Specify the output transmission queue to which to map all input from an associated forwarding class.
This statement enables you to configure up to 16 forwarding classes with multiple
forwarding classes mapped to single queues. If you want to configure up to eight
forwarding classes with one-to-one mapping to output queues, use the queue statement instead of
the class statement at the [edit class-of-service forwarding-classes]
hierarchy level.
Map one or more forwarding classes to a single queue. Also, when configuring DSCP-based PFC, map a forwarding class to a PFC priority value to use in pause frames when traffic on a DSCP value becomes congested (see Configuring DSCP-based PFC for Layer 3 Untagged Traffic for details).
You can map unicast forwarding classes to a unicast queue (0 through 7) and multidestination forwarding classes to a multicast queue (8 through 11). The queue to which you map a forwarding class determines if the forwarding class is a unicast or multicast forwarding class.
Options
class-name—Name of the forwarding class.
queue-number—Output queue number.
-
Range: 0 through 7.
The remaining statements are explained separately. See CLI Explorer for details.
Required Privilege Level
interface—To view this statement in the configuration.interface-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 8.1.
No-loss option introduced in Junos OS Release 12.3 for the QFX Series.
PFC-priority statement introduced in Junos OS Release 17.4R1 for the QFX Series.