Forwarding Classes And Plp Levels; Table 3: Policer Actions - Juniper EX9200 Features Manual

Traffic Policers Feature Guide for EX9200 Switches

Forwarding Classes and PLP Levels

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along with their associated burst sizes, the CBS and peak burst size (PBS). Traffic is
marked as belonging to one of three categories (green, yellow, or red) based on whether
the packets arriving are below the CIR (green), exceed the CIR (yellow) but not the
PIR, or exceed the PIR (red).
A two-rate three-color policer is most useful when a service is structured according to
arrival rates and not necessarily packet length.
Policer actions are implicit or explicit and vary by policer type. The term Implicit means
that Junos assigns the loss-priority automatically.
policer actions.

Table 3: Policer Actions

Policer Marking
Single-rate two-color Green (Conforming)
Red (Nonconforming)
Single-rate Green (Conforming)
three-color
Yellow (Above the CIR
and CBS)
Red (Above the EBS)
Two-rate three-color Green (Conforming)
Yellow (Above the CIR
and CBS)
Red (Above the PIR
and PBS)
A packet's forwarding class assignment and PLP level are used by the Junos OS
class of service (CoS) features. The Junos OS CoS features include a set of mechanisms
that you can use to provide differentiated services when best-effort traffic delivery is
insufficient. For router (and switch) interfaces that carry IPv4, IPv6, and MPLS traffic,
you can configure CoS features to take in a single flow of traffic entering at the edge of
Table 3 on page 6 describes the
Implicit Action Configurable Action
Assign low loss None
priority
None Assign low or high loss
priority, assign a
forwarding class, or
discard
On some platforms,
you can assign
medium-low or
medium-high loss
priority
Assign low loss None
priority
Assign medium-high None
loss priority
Assign high loss Discard
priority
Assign low loss None
priority
Assign medium-high None
loss priority
Assign high loss Discard
priority
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