Dell PowerConnect 3548 User Manual

Configuring Quality of Service 441
Configuring Quality of Service
This section provides information for defining and configuring Quality of Service (QoS) parameters.
To open the Quality of Service page, click Quality of Service in the tree view.
This section contians the following topics:
• "Quality of Service (QoS) Overview" on page 441
• "Configuring QoS Global Settings" on page 443
Quality of Service (QoS) Overview
Quality of Service (QoS) provides the ability to implement QoS and priority queuing within a network.
An implementation example that requires QoS includes certain types of traffic such as Voice, Video
and real-time traffic, which 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 tag (VPT) and DSCP (DiffServ
Code Point).
VPT Classification Information
VLAN Priority Tags are used to classify the packets by mapping packets to one of the egress queues.
VLAN Priority Tag to queue assignments are user-definable. The table below details the VPT to
queue default settings:
Table 9-1. CoS to Queue Mapping Table Default values
CoS Value Forwarding Queue Values
0q2
1 q1 (Lowest Priority)
2 q1 (Lowest Priority)
3q2
4q3

Dell PowerConnect 3548 Specifications

General

MAC address table	8000 entries
Maximum data transfer rate	0.1 Gbit/s
Supported data transfer rates	10/100 Mbps
10G support	-
Number of VLANs	256
Flow control support	Yes
Networking standards	IEEE 802.1D, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.3ad
Dimensions (WxDxH)	440 x 257 x 43.2 mm
Networking features	Gigabit Ethernet, Fast Ethernet
Authentication method	RADIUS, TACACS+
Connectivity technology	Wired
Switch type	Managed
Switch layer	L2
Data link protocols	Ethernet
Supported network protocols	HTTP, HTTPS/SSL, SSH
Power connector	DC-in jack
SFP/SFP+ slots quantity	2
Basic switching RJ-45 Ethernet ports quantity	48
Product color	Black
Storage temperature (T-T)	-20 - 70 °C
Operating temperature (T-T)	0 - 45 °C
Storage relative humidity (H-H)	10 - 95 %
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Weight	8000 g