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C o n f i g u r i n g Q u a l i t y o f S e r v i c e
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QoS includes traffic such as voice, video, and real-time traffic that can be assigned a high
priority queue, while other traffic can be assigned a lower priority queue. The result is an
improved traffic flow for traffic with high demand.
QoS is defined by:
•
Classification
—Specifies which packet fields are matched to specific values. All
packets matching the user-defined specifications are classified together.
•
Action
—Defines traffic management where packets being forwarded are based on
packet information, and packet field values such as VLAN priority (VPT) and DSCP
(DiffServ Code Point).
•
Prioritization
—Traffic is assigned a priority and queued on the appropriate queue for
forwarding.
Class of Service (CoS) Information
Eight CoS values can be mapped to one of four forwarding queues (queue 1 to 4). Each
queue has a different priority. The first queue has the lowest forwarding priority, while the
fourth queue has the highest forwarding priority and is not mapped by default.
NOTE:
In a stacking configuration, Queue 4 is used for forwarding stacking traffic. Therefore,
assigning additional traffic to Queue 4 may interfere with stack control.
There are three mapping tables:
•
CoS to Queue Mapping Table.
•
DSCP to Queue Mapping Table.
•
TCP/UDP to Queue Mapping Table. The TCP/UDP table is empty by default.
The
Cos to Queue Mapping Table
has default CoS mapping to forwarding queue values:
CoS Value
Forwarding Queue Values
0
q2
1
q1 (Lowest Priority = Best Effort)
2
q1 (Lowest Priority = Best Effort)
3
q2
4
q2
5
q3
6
q3
Содержание 3348 - PowerConnect Switch - Stackable
Страница 19: ...S E C T I O N 2 Hardware Description PowerConnect 3324 3348 Description Ports Description LED Definitions ...
Страница 102: ...102 Getting Started w w w d e l l c o m s u p p o r t d e l l c o m ...
Страница 293: ...S E C T I O N 8 Viewing Statistics Viewing Tables Viewing RMON Information Viewing Charts ...
Страница 356: ...356 Configuring Quality of Service w w w d e l l c o m s u p p o r t d e l l c o m ...