Juniper ACX1000 Configuration Manual page 985

Consider a sample configuration that has two child policers aggregated by a parent PIR
in hybrid mode. PIRs for the children policers and the parent policer are configured. When
two flows, flow 1 and flow 2, transmit traffic at a rate that exceeds the configured PIR
values, then the share of the parent PIR is adjusted to permit traffic for the child policers
while the child PIR values are preserved for the two flows.
Hybrid mode of working of the aggregate or hierarchical policer supports two rates (CIR
and PIR) and three colors for micro-flows. On ACX routers, for hybrid type of the policer,
the micro-policer must be of type modified-trtcm as defined in RFC 4115. Both color-blind
and color- aware modes are supported for child policers. Macro policer must be a single
rate, single bucket, two color policer with the sum of the CIR values of the micro-flows
being less than the PIR value of the macro-flow, and the cumulative value of all the PIR
values of the micro-flows being greater than the PIR value of the macro-flow. When
micro-flow traffic is less than the CIR value of the micro-flow CIR, the policer causes
either the micro-flow CIR to be maintained or PIR to be achieved. When micro-flow traffic
is greater than the CIR value of the micro-flow, the micro-flow CIR is guaranteed.
Micro-flow excess rates are shared based on the available macro-flow bandwidth with
the limitation of the excess information rate distributed for the micro-flows being
implemented by the micro-flow PIR. The CBS of the macro-flow must be greater than
or equal to the aggregate of the micro-flow CBS. The excess burst size (EBS) of the
macro-flow must be greater than or equal to that of the micro-flow with the largest EBS.
An arriving packet complies with the hybrid mode if tokens are present in the committed
burst size (CBS) of the child policer. The packet does not comply with hybrid mode if
tokens are present in both the EBS of the child policer and the PBS of the parent policer.
When a packet does not satisfy the hybrid mode of working of a policer, the CIR of the
child policer is guaranteed for the member traffic flows and the PIR value of the child
policer is the maximum permitted rate for the member flows. The following table describes
the different scenarios of color-coding for micro-flow and macro-flow policers and the
resultant color or priority that is assigned:
Micro-Color
Green
Red
Yellow
Yellow
Red
Red
Related
Documentation
Copyright © 2017, Juniper Networks, Inc.
The sum of yellow traffic is less than or equal to 11 Mbps .
Hierarchical Policers on ACX Series Routers Overview on page 920
Guidelines for Configuring Hierarchical Policers on ACX Routers on page 921
Chapter 27: Configuring Class of Service
Macro-Color
Green
Green
Green
Red
Green
Red
Result
Green
Green
Yellow
Red
Red
Red
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