Dell PowerConnect 3324 User's manual
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Brand: Dell
Type: Operation & user’s manual
Model: Dell 3348 - PowerConnect Switch - Stackable , Dell PowerConnect 3324
Pages: 278 (15.43 Mb)
Download Dell 3348 - PowerConnect Switch - Stackable Operation & user’s manual
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:
l Classification—Specifies which packet fields are matched to specific values. All packets matching the user-defined specifications are classified together.
l 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).
l 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.
There are three mapping tables:
l CoS to Queue Mapping Table.
l DSCP to Queue Mapping Table.
l 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 to Queue Mapping Table Default Values
CoS mapping is enabled on a per-system basis. The CoS value order is from zero to seven, where zero is the lowest priority and seven is the highest.
DSCP values can be mapped to priority queues. The DSCP to Queue Mapping Table Default Values Table contains the default DSCP mapping to forwarding
queue values:
DSCP to Queue Mapping Table Default Values
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.
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
7
q3
DSCP Value
Forwarding Queue Values
0-7
q1 (Lowest Priority)
8-15
q1
16-23
q2
24-31
q2
32-39
q2
40-47
q3
48-55
q3
55-63
q3 (Highest Priority)