Alcatel-Lucent 7450 Quality Of Service Manual page 362

Service SAP QoS Policy Command Reference
config>qos>sap-ingress>queue
Description
The percent-rate command within the SAP ingress and egress QOS policy enables supports for a
queue's PIR and CIR rate to be configured as a percentage of the egress port's line rate or of its parent
scheduler's rate. When the rates are expressed as a port-limit, the actual rates used per instance of the
queue will vary based on the port speed. For example, when the same QOS policy is used on a 1-
Gigabit and a 10-Gigabit Ethernet port, the queue's rates will be 10 times greater on the 10 Gigabit
port due to the difference in port speeds. This enables the same QOS policy to be used on SAPs on
different ports without needing to use SAP based queue overrides to modify a queue's rate to get the
same relative performance from the queue.
If the port's speed changes after the queue is created, the queue's PIR and CIR rates will be
recalculated based on the defined percentage value.
When the rates are expressed as a local-limit, the actual rates used per instance of the queue are relative
to the queue's parent scheduler rate. This enables the same QOS policy to be used on SAPs with
different parent scheduler rates without needing to use SAP based queue overrides to modify a queue's
rate to get the same relative performance from the queue. If the parent scheduler rate changes after the
queue is created, the queue's PIR and CIR rates will be recalculated based on the defined percentage
value.
The rate and percent-rate commands override one another. If the current rate for a queue is defined
using the percent-rate command and the rate command is executed, the percent-rate values are deleted.
In a similar fashion, the percent-rate command causes any rate command values to be deleted. A
queue's rate may dynamically be changed back and forth from a percentage to an explicit rate at
anytime.
Queue rate overrides can only be specified in the form as configured in the QoS policy (a SAP override
can only be specified as a percent-rate if the associated QoS policy was also defined as percent-rate).
Likewise, a SAP override can only be specified as a rate (kbps) if the associated QoS policy was also
defined as a rate. Queue-overrides are relative to the limit type specified in the QOS policy.
The no form of this command returns the queue to its default shaping rate and cir rate. When no
percent-rate is defined within a SAP ingress or egress queue-override, the queue reverts to the defined
shaping and CIR rates within the SAP ingress and egress QOS policy associated with the queue.
Parameters pir-percent — The pir-percent parameter is used to express the queue's PIR as a percentage
cir cir-percent — The cir keyword is optional and when defined the required cir-percent CIR
port-limit — The port-limit keyword specifies that the configure PIR and CIR percentages are
local-limit — The local-limit keyword specifies that the configure PIR and CIR percentages are
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dependent on the use of the port-limit or local-limit.
Values
Percentage ranging from 0.01 to 100.00. The default is 100.00.
parameter expresses the queue's CIR as a percentage dependent on the use of the port-limit
or local-limit.
Values Percentage ranging from 0.00 to 100.00. The default is 100.00
relative to the rate of the port (including the ingress-rate/egress-rate setting) to which this
queue connects.
relative to the rate of the queue's parent scheduler rate or agg-rate rate at egress.
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