Alcatel-Lucent 7950 Quality Of Service Manual page 256

Service Egress QoS Policy Forwarding Class Commands
not considered part of the description string. Only printable ASCII characters are allowed in the string.
The sting does not need to be unique and may be repeated in the descriptions for other policer control
policies or other objects. If the command is executed without the description-sting present, any existing
description string will be unaffected.
Default
adaptation-rule
Syntax adaptation-rule [pir {max | min | closest}] [cir {max | min | closest}]
no adaptation-rule
Context config>qos>sap-egress>policer
Description This command is used to define how the policer's configuration parameters are translated into the
underlying hardware capabilities used to implement each policer instance. For instance, the configured rates
for the policer need to be mapped to the timers and decrement granularity used by the hardware's leaky
bucket functions that actually perform the traffic metering. If a rate is defined that cannot be exactly
matched by the hardware, the adaptation-rule setting provides guidance for which hardware rate should be
used.
The max keyword tells the system that the defined rate is the maximum rate that should be given to the
policer. If the hardware cannot exactly match the given rate, the next lowest hardware supported rate is used.
The min keyword tells the system that the defined rate is the minimum rate that should be given to the
policer. If the hardware cannot exactly match the given rate, the next highest hardware supported rate is
used.
The closest keyword tells the system that the defined rate is the target rate for the policer. If the hardware
cannot exactly match the given rate, the system will use the closest hardware supported rate compared to the
target rate.
The hardware also needs to adapt the given mbs and cbs values into the PIR bucket violate threshold
(discard) and the CIR bucket exceed threshold (out-of-profile). The hardware may not have an exact
threshold match which it can use. In R8.0, the system treats the mbs and cbs values as minimum threshold
values.
The no form of this command is used to return the policer's metering and profiling hardware adaptation
rules to closest.
Parameters pir {max | min | closest} — When the optional pir parameter is specified, the max, min or closest keyword
qualifier must follow.
max — The max keyword is used to inform the system that the metering rate defined for the policer is the
maximum allowed rate. The system will choose a hardware supported rate that is closest but not
exceeding the specified rate.
min — The min keyword is used to inform the system that the metering rate defined for the policer is the
minimum allowed rate. The system will choose a hardware supported rate that is closest but not lower
than the specified rate.
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7950 XRS Quality of Service Guide