Chapter 7: Quality of Service (QoS)
QoS Overview
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The egress path consists of the following QoS building blocks:
Queue Manager – This is the mechanism responsible for managing the transmission queues,
utilizing smart WRED per queue and per packet color (Green or Yellow).
Scheduling and Shaping – A hierarchical mechanism that is responsible for scheduling the
transmission of frames from the transmission queues, based on priority among queues,
Weighted Fair Queuing (WFQ) in bytes per each transmission queue, and eligibility to transmit
based on required shaping on several different levels (per queue, per service bundle, and per
port).
Marker – This mechanism provides the ability to modify priority bits in frames based on the
calculated CoS and Color.
For a more detailed description of QoS in the PTP 820, refer to the Technical Description for
the PTP 820 product type you are using.