6. The scheduler defines how traffic is treated in the output queue—for example, the
transmit rate, buffer size, priority, and drop profile (at the [edit class-of-service
schedulers] hierarchy level).
7. The scheduler map assigns a scheduler to each forwarding class (at the [edit
class-of-service scheduler-maps] hierarchy level).
8. The drop-profile defines how aggressively to drop packets that are using a particular
scheduler (at the [edit class-of-service drop-profiles] hierarchy level).
9. The rewrite rule takes effect as the packet leaves a logical interface that has a rewrite
rule configured (at the [edit class-of-service rewrite-rules] hierarchy level). The rewrite
rule writes information to the packet (for example, EXP or DSCP bits) according to
the forwarding class and loss priority of the packet.
Figure 2 on page 16 and Figure 3 on page 16 show the components of the Junos CoS
features, illustrating the sequence in which they interact.
Figure 2: CoS Classifier, Queues, and Scheduler
Figure 3: Packet Flow Through CoS Configurable Components
g017213
Behavior
Aggregate
Classifier
Multifield
Classifier
Input Policer
Forwarding
Policy
Options
Forwarding Class
and Loss Priority
Rewrite
Marker
Scheduler/Shaper/RED
(all platforms)
Adaptive Shaper/Virtual Channels
(J Series only)
Output Policer
Fabric Scheduler
(M320 and
T Series only)
Copyright © 2013, Juniper Networks, Inc.16
Class of Service Overview and Examples for EX9200 Switches
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