QoS and QoS Policies
146
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
3.7.6 Network and Service QoS Queue Parameters
The following queue parameters are provisioned on network and service queues:
• Queue ID
• Committed Information Rate
• Peak Information Rate
• Adaptation Rule
• Committed Burst Size
• Maximum Burst Size
• High-Priority-Only Buffers
• High and Low Enqueuing Thresholds
• Queue Counters
• Queue Type
• Rate Limiting
3.7.6.1 Queue ID
The queue ID is used to uniquely identify the queue. The queue ID is only unique
within the context of the QoS policy within which the queue is defined.
3.7.6.2 Committed Information Rate
The CIR for a queue defines a limit for scheduling. Packets queued at service ingress
queues are serviced by in-profile or out-of-profile schedulers based on the queue’s
CIR and the rate at which the packets are flowing. For each packet in a service
ingress queue, the CIR is checked with the current transmission rate of the queue. If
the current rate is at or below the CIR threshold, the transmitted packet is internally
marked in-profile. If the flow rate is above the threshold, the transmitted packet is
internally marked out-of-profile.
All 7705 SAR queues support the concept of in-profile and out-of-profile. The
network QoS policy applied at network egress determines how or if the profile state
is marked in packets transmitted into the network core. This is done by enabling or
disabling the appropriate priority marking of network egress packets within a
particular forwarding class. If the profile state is marked in the packets that are sent
toward the network core, then out-of-profile packets are preferentially dropped over
in-profile packets at congestion points in the network.
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