Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 147
When defining the CIR for a queue, the value specified is the administrative CIR for
the queue. The 7705 SAR maps a user-configured value to a hardware supported
rate that it uses to determine the operational CIR for the queue. The user has control
over how the administrative CIR is converted to an operational CIR if a slight
adjustment is required. The interpretation of the administrative CIR is discussed in
Adaptation Rule.
The CIR value for a service queue is assigned to ingress and egress service queues
based on service ingress QoS policies and service egress QoS policies, respectively.
The CIR value for a network queue is defined within a network queue policy
specifically for the forwarding class. The queue-id parameter links the CIR values to
the forwarding classes. The CIR values for the forwarding class queues are defined
as a percentage of the network interface bandwidth.
3.7.6.3 Peak Information Rate
The PIR value defines the maximum rate at which packets are allowed to exit the
queue. It does not specify the maximum rate at which packets may enter the queue;
this is governed by the queue’s ability to absorb bursts and is user-configurable using
its maximum burst size (MBS) value.
The PIR value is provisioned on ingress and egress service queues within service
ingress QoS policies and service egress QoS policies, respectively.
The PIR values for network queues are defined within network queue policies and
are specific for each forwarding class. The PIR value for each queue for the
forwarding class is defined as a percentage of the network interface bandwidth.
When defining the PIR for a queue, the value specified is the administrative PIR for
the queue. The 7705 SAR maps a user-configured value to a hardware supported
rate that it uses to determine the operational PIR for the queue. The user has control
over how the administrative PIR is converted to an operational CIR if a slight
adjustment is required. The interpretation of the administrative PIR is discussed in
Adaptation Rule.
To Next Page
Loading...
