Queue Sharing and Redirection
Quality of Service Guide 455
Context config>qos>qgrps>egr>qgrp>queue
Description This command configures the target queue delay for packets forwarded through the queue. It is used
to determine the related queue parameters based on the administrative PIR of the queue. This command
and the mbs command are mutually exclusive.
In order to change between the mbs and queue-delay parameters, the current parameter must be
removed before adding the new parameter, that is, changing from mbs to queue-delay requires a no
mbs before the queue-delay is configured and changing from queue-delay to mbs requires a no
queue-delay before the mbs is configured.
If queue-delay is configured for an egress queue group queue, it is not possible to override the MBS
for that queue.
The no form of this command disables the determination of the queue parameters based on the queue
delay.
Default no queue-delay
Parameters delay — target queue delay in milliseconds
Values 1 to 5000 (decimal)
rate
Syntax rate pir-rate [cir cir-rate]
no rate
Context config>qos>qgrps>egr>qgrp>queue
config>qos>qgrps>ing>qgrp>policer
config>qos>qgrps>egr>qgrp>policer
Description This command defines the administrative Peak Information Rate (PIR) and the administrative
Committed Information Rate (CIR) parameters for the queue or policer. The PIR defines the maximum
rate that the queue or policer can transmit packets out an egress interface (for SAP egress queues or
policer). Defining a PIR does not necessarily guarantee that the queue can transmit at the intended rate.
The actual rate sustained by the queue or policer can be limited by oversubscription factors or available
egress bandwidth.
The CIR defines the rate at which the system prioritizes the queue or policer over other queues or
policer competing for the same bandwidth. In-profile then out-of-profile packets are preferentially
queued by the system at egress and at subsequent next hop nodes where the packet can traverse. To be
properly handled throughout the network, the packets must be marked accordingly for profiling at each
hop.
The CIR can be used by the queue or policer’s parent commands cir-level and cir-weight parameters
to define the amount of bandwidth considered to be committed for the child queue during bandwidth
allocation by the parent scheduler.
To Next Page
Loading...
