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QoS Overview
The meter parameters are:
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Meter ID
The meter ID is used to uniquely identify the meter. The meter ID is only unique within the
context of the QoS policy within which the meter is defined.
Committed Information Rate
The committed information rate (CIR) for a meter is the long term average rate at which traffic is
considered as conforming traffic or in-profile traffic. The higher the rate, the greater the
throughput user can expect. The user will be able to burst above the CIR and up to PIR for brief
periods of time. The time and profile of the packet is decided based on the burst sizes as explained
in the following sections.
When defining the CIR for a meter, the value specified is the administrative CIR for the meter. The
7210 SAS devices have a number of native rates in hardware that it uses to determine the
operational CIR for the meter. The user has some control over how the administrative CIR is
converted to an operational CIR should the hardware not support the exact CIR and PIR
combination specified. Refer to the interpretation of the administrative CIR in
Meters on page
The CIR for meter is provisioned on service ingress and network ingress within service ingress
QoS policies and network QoS policies, respectively.
Peak Information Rate
The peak information rate (PIR) defines the maximum rate at which packets are allowed to exit the
meter. It does not specify the maximum rate at which packets may enter the meter; this is governed
by the meter's ability to absorb bursts and is defined by its maximum burst size (MBS).
Page 30
7210 SAS-X and 7210 SAS-R6 OS Quality of Service Guide
Meter ID on page 30
Committed Information Rate on page 30
Peak Information Rate on page 30
Adaptation Rule for Meters on page 31
Committed Burst Size on page 33
Maximum Burst Size on page 33
Meter Counters on page 33
Meter Modes on page 34
31.
Adaptation Rule for
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