Quality of Service (QoS) overview
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Introduction
Quality of service (QoS) control allows to differentiate between Ethernet frames with
different priorities. If traffic with a high priority and traffic with a low priority compete
for SDH capacity, the traffic with the high priority should be served first. This can be
realized through quality of service control.
QoS control is supported on the E/FE and Gigabit Ethernet cards, in the IEEE 802.1Q
VLAN tagging mode and the IEEE 802.1ad VLAN tagging mode (provider bridge
mode). QoS control is implemented as a DiffServ architecture applied to layer 2 (in
accordance with IETF recommendations on Differentiated Services, cf. www.ietf.org).
Flow classification, queueing, and scheduling
The following figure provides an overview of the QoS control:
Traffic provisioning
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365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
8-81
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