PRELIMINARY
Technical Description
Rate (CIR), Committed Burst Size (CBS), Excess Information Rate (EIR), and
Excess Burst Size (EBS). The policing mechanism drops excess traffic if the
bit rate reaches the configured maximum bit rate.
The policing mechanism supports bandwidth profiles for MEF services in one
of the following ways:
• Per UNI
•
Per UNI + CoS
• Per EVC
• Per EVC + CoS
4.4.4 Mapping Operator Priority to Priority Queue
The Ethernet egress port has eight priority queues (also known as Traffic
Classes (TCs)). The mechanism for mapping operator priority to priority queue
uses a mapping table to forward frames to the correct priority queue. To handle
temporary link congestion, the Ethernet egress port has a buffer. The priority
queues share the buffer capacity.
4.4.5 Queuing
The queuing mechanism supports the following queue management
mechanisms for the priority queues:
• Tail dropping
• Weighted Random Early Detection (WRED)
• Aging
A combination of queue management mechanisms is often used to get the
required behavior.
4.4.6
Scheduling
The scheduling mechanism handles congestion by emptying the priority queues
according to one or both of the following algorithms:
• Strict Priority (SP)
• Weighted Fair Queuing (WFQ)
The scheduling mechanism can be set up to work with one set of high-priority
SP queues, one set of WFQ queues, and optionally one low-priority SP queue,
as in the example in Figure 15.
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1/22102-HRA 901 17/9 Uen PU1 | 2016-07-04
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