
Chapter 4: Feature Description
Ethernet Features
Figure 62 Detailed H-QoS Diagram
WFQ
WFQ
WFQ
WFQ
Service 1
Service 2
Service Point
Service Point
Queues (CoS)
CoS0
CoS1
CoS2
CoS4
CoS5
CoS6
CoS7
CoS3
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Dual
Shaper
CoS0
CoS1
CoS2
CoS4
CoS5
CoS6
CoS7
CoS3
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Single
Rate
Dual
Shaper
Service Bundle
Priority 4 (Highest)
Priority 3
Priority 2
Priority 1 (Lowest)
Port
Single
Shaper
H- QoS Mode
As discussed above, users can select whether to work in Standard QoS mode or H-QoS mode.
•
If the user configured all the egress service points to transmit traffic via a single service
bundle, the operational mode is Standard QoS. In this mode, only Service Bundle 1 is active
and there are eight output transmission queues.
•
If the user configured the egress service points to transmit traffic via multiple service bundles,
the operational mode is H-QoS. H-QoS mode enables users to fully distinguish among the
streams and to achieve SLA per service.
Shaping on the Egress Path
Egress shaping determines the traffic profile for each queue. PTP 820S performs egress shaping
on the following three levels:
•
Queue level – Single leaky bucket shaping.
•
Service Bundle level – Dual leaky bucket shaping
•
Interface level – Single leaky bucket shaping
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