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QoS Overview
QoS Overview
The 7210 SAS devices are designed with QoS mechanisms on both ingress and egress to support
multiple services per physical port. The 7210 SAS devices are extensive and flexible capabilities
to Classify, Police, Queue, Shape, and mark traffic.
NOTE: The QoS capabilities supported on different 7210 SAS platforms are different. In other
words, not all the platforms support all of the capabilities. Please read through the following
chapters to know what is available on different 7210 SAS platforms.
In the Alcatel-Lucent service router's service model, a service is provisioned on the provider-edge
(PE) equipment. Service data is encapsulated and then sent in a service tunnel to the far-end
Alcatel-Lucent service router where the service data is delivered.
The operational theory of a service tunnel is that the encapsulation of the data between the two
Alcatel Lucent service routers appear like a Layer 2 path to the service data although it is really
traversing an IP or IP/MPLS core. The tunnel from one edge device to the other edge device is
provisioned with an encapsulation and the services are mapped to the tunnel that most
appropriately supports the service needs.
The 7210 SAS supports eight forwarding classes internally named: Network-Control, High-1,
Expedited, High-2, Low-1, Assured, Low-2 and Best-Effort. The forwarding classes are discussed
in more detail in
7210 SAS devices use QoS policies to control how QoS is handled at distinct points in the service
delivery model within the device. There are different types of QoS policies that cater to the
different QoS needs at each point in the service delivery model. QoS policies are defined in a
global context in the 7210 SAS and only take effect when the policy is applied to a relevant entity.
QoS policies are uniquely identified with a policy ID number or name. Typically, Policy ID 1 or
Policy ID "default" (there are a few instances where the default QoS policy uses a different ID) is
reserved for the default policy which is used if no policy is explicitly applied.
The QoS policies within the 7210 SAS can be divided into three main types:
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7210 SAS D, E, K OS Quality of Service Guide
Forwarding Classes on page
QoS policies are used for classification, defining metering and queuing attributes and
defining marking behavior.
Slope policies define default buffer allocations and WRED slope definitions.
Port Scheduler policies, SAP ingress/egress policies or network/network-queue policies
determine how queues are scheduled.
108.
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