Juniper ACX1000 Configuration Manual page 983

with PIR values of 50 Mbps, 40 Mbps, 30 Mbps, and 20 Mbps respectively. Such a setting
is used in topologies in which you want to prevent a certain subscriber or user from utilizing
an increased share ofthe macro-flow or the parent CIR for real-time applications, such
as video-on-demand (VoD) or voice over IP (VoIP). For example, if only 100 Mbps of EF
packets are received, the permitted bandwidth rate for the traffic is 50 Mbps. When 100
Mbps of traffic is received for each of the four services, then the aggregate allowed traffic
is 100 Mbps, in which the rates are as follows for the different services:
All the child policers must be of single-rate, single-bucket, and two-color types for
bandwidth-protection or peak mode of the hierarchical policer. The micro-flow policer
value specifies the maximum allowed bandwidth (PIR) for the micro-flow. The macro-flow
policer value specifies the maximum allowed bandwidth (PIR) for all the flows. The sum
of the PIR values of the micro-flows must be greater than or equal to the PIR values of
the child policers. The macro-flow burst-size must be greater than or equal to that of
the micro-flow with the largest burst-size.
Consider a sample configuration that has two child policers aggregated by a parent PIR
in bandwidth-guarantee 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 based on their priorities defined for the flows, while the bandwidth is
restricted to maintain the minimum or committed rates of traffic flows.
An arriving packet complies with the bandwidth-guarantee mode if tokens are present
in the peak burst size (PBS) of both the child policer and the parent policer. If sufficient
tokens are not present in the PBS of both the policers, the packet does not conform to
the peak mode of the hierarchical policer working. In such a case, the child policer rate
is the maximum allowed rate or PIR 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
Green
Red
Red
Copyright © 2017, Juniper Networks, Inc.
Less than or equal to 50 Mbps for EF traffic
Less than or equal to 40 Mbps for Gold traffic
Less than or equal to 30 Mbps for Silver traffic
Less than or equal to 20 Mbps for Bronze traffic
Chapter 27: Configuring Class of Service
Macro-Color
Green
Red
Green
Red
Result
Green
Red
Red
Red
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