Service Ingress Qos Policies - Alcatel-Lucent 7210 SAS M OS Quality Of Service Manual

QoS Overview
Committed Burst Size
The committed burst size (CBS ) parameters specify the amount of buffers that can be drawn from
the reserved buffer portion of the queue's buffer pool. Once the reserved buffers for a given queue
have been used, the queue contends with other queues for additional buffer resources up to the
maximum burst size.
The CBS for the queues is not configurable entity for the access, network ports and access uplink
ports. The CBS value for the queues is set to appropriate default values which takes care of
specific FC needs in terms of maintaining the differential treatment.

Service Ingress QoS Policies

Service ingress QoS policies define ingress service forwarding class meters and map flows to
those meters. When a service ingress QoS policy is created, it always has two meters defined that
cannot be deleted: one for the all unicast traffic and one for all multipoint traffic. These meters
exist within the definition of the policy. The meters only get instantiated in hardware when the
policy is applied to a SAP. In the case where the service does not have multipoint traffic, the
multipoint meters will not be instantiated.
In the simplest service ingress QoS policy, all traffic is treated as a single flow and mapped to a
single meter, and all flooded traffic is treated with a single multipoint meter. The required elements
to define a service ingress QoS policy are:
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Optional service ingress QoS policy elements for include:
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Each meter can have unique meter parameters to allow individual policing of the flow mapped to
the forwarding class.
forwarding classes.
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A unique service ingress QoS policy ID.
A QoS policy scope of template or exclusive.
The number of classification and meter resources to allocate for this policy.
Allocates resources from the ingress internal CAM resource pool for use for service
ingress QoS policies. Additionally, allocate resources to the appropriate classification
match criteria.
At least one default forwarding class meter. The parameters that can be configured for a
meter are discussed in
Additional unicast meters up to a total of 8.
Additional multipoint meters up to 31.
QoS policy match criteria to map packets to a forwarding class.
Figure 4 depicts service traffic being classified into three different
Meter Parameters on page
7210 SAS M OS Quality of Service Guide
40.