Quality of Service Guide Network Queue QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 245
Special Cases Forwarding Class Queue on Egress Network Ports or Bundles — the total MBS
settings for all network egress queues on the port or channel based on the total
percentages can exceed 100%. Some oversubscription can be desirable to allow
exceptionally busy forwarding classes more access to buffer space. The proper use
of CBS settings will ensure that oversubscribing MBS settings will not starve other
queues of buffers when needed.
Forwarding Class Queue on Ingress Adapter Cards — the mbs value is used to
calculate the queue’s MBS size based on the total amount of buffer space allocated
to the network ingress queue on the adapter card.
The total MBS settings for all network egress queues on the port or channel based
on the total percentages can exceed 100%. Some oversubscription can be desirable
to allow exceptionally busy forwarding classes more access to buffer space. The
proper use of CBS settings will ensure that oversubscribing MBS settings will not
starve other queues of buffers when needed.
Parameters percent — the percent of buffers from the total queue space allowed for the maximum
amount of buffers, expressed as a decimal percentage
Values 0.00 to 100.00
rate
Syntax rate percent [cir percent]
no rate
Context config>qos>network-queue>queue
Description This command defines the administrative Peak Information Rate (PIR) and the administrative
Committed Information Rate (CIR) parameters for the queue. Defining a PIR does not
necessarily guarantee that the queue can transmit at the intended rate. The actual rate
sustained by the queue can be limited by oversubscription factors or available egress
bandwidth.
The CIR defines the percentage at which the system prioritizes the queue over other queues
competing for the same bandwidth.
The rate command can be executed at any time, altering the PIR and CIR rates for all queues
created through the association of the SAP ingress or SAP egress QoS policy with the
queue-id.
The no form of the command returns all queues created with the queue-id by association with
the QoS policy to the default PIR and CIR parameters (100, 0).
Parameters percent — defines the percentage of the maximum rate allowed for the queue. When the
rate command is executed, a valid PIR setting must be explicitly defined. When the
rate command has not been executed, the default PIR of 100 is assumed. Fractional
values are not allowed and must be given as a positive integer.
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