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Page 51 / 104 Scroll up to view Page 46 - 50
43
Chapter 5: Configuring the Switch through the Web Utility
QoS
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
QoS
The QoS tab includes links to the following screens.
•
CoS Settings
•
Queue Settings
•
CoS to Queue
•
IP Precedence/DSCP
•
IP Port
•
ACL Priority
•
Rate Limit
Page 52 / 104
44
Chapter 5: Configuring the Switch through the Web Utility
QoS
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Class of Service Settings
Class of Service (CoS) allows you to specify which data packets have greater precedence when traffic is buffered
in the switch due to congestion. This switch supports CoS with four priority queues for each port. Data packets in
a port’s high-priority queue will be transmitted before those in the lower-priority queues. You can set the default
priority for each interface, and configure the mapping of frame priority tags to the switch’s priority queues.
The priority levels recommended in the IEEE 802.1p standard for various network applications are shown in the
following table. However, you can map the priority levels to the switch’s output queues in any way that benefits
application traffic for your own network.
Priority
. CoS value. (Range: 0-7, where 7 is the highest priority)
Traffic Type
. Output queue buffer. (Range: 0-3, where 3 is the highest CoS priority queue)
Modify the default priority for any interface using the textfield provided. CoS can be enabled or disabled by using
the CoS Mode checkbox.
Default settings can be restored using the Restore Defaults checkbox.
Click
submit
to save the changes.
Table 1:
Priority Level
Traffic Type
1
Background
2
(Spare)
0
(default) Best Effort
3
Excellent Effort
4
Controlled Load
5
Video, less than 100 milliseconds latency and jitter
6
Voice, less than 10 milliseconds latency and jitter
7
Network Control
Figure 5-25: QoS - CoS Settings
Page 53 / 104
45
Chapter 5: Configuring the Switch through the Web Utility
QoS
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Queue Settings
This switch prioritizes each packet based on the required level of service, using four priority queues with strict or
Weighted Round Robin Queuing. It uses IEEE 802.1p and 802.1Q tags to prioritize incoming traffic based on input
from the end-station application. These functions can be used to provide independent priorities for delay-
sensitive data and best-effort data.
Queue Mode (Global)
. You can set the switch to service the queues based on a strict rule that requires all traffic
in a higher priority queue to be processed before lower priority queues are serviced, or use Weighted Round-
Robin (WRR) queuing that specifies a relative weight of each queue. WRR uses a predefined relative weight for
each queue that determines the percentage of service time the switch services each queue before moving on to
the next queue. This prevents the head-of-line blocking that can occur with strict priority queuing.
•
WRR
. Weighted Round-Robin shares bandwidth at the egress ports by using scheduling weights 1, 2, 4, 6
for queues 0 through 3 respectively.
•
Strict
. Services the egress queues in sequential order, transmitting all traffic in the higher priority queues
before servicing lower priority queues.
Set the Queue Mode to Strict or WRR using the Queue Mode drop-down menu then click
submit
.
Enter a weight, select a traffic class (that is, output queue) then click
submit
to save the changes.
Weight Value
. Set a new weight for the selected traffic class. However, note that Queue 0 is fixed at a weight of
1, and cannot be configured. (Range: 1-31)
CoS to Queue
Class of Service. CoS value
. (Range: 0-7, where 7 is the highest priority)
Queue
. Output queue buffer. (Range: 0-3, where 3 is the highest CoS priority queue)
Assign priorities to the traffic classes (that is, output queues) for the selected interface.
Click
submit
to save the changes.
Figure 5-26: QoS - Queue Settings
Figure 5-27: QoS - CoS to Queue
Page 54 / 104
46
Chapter 5: Configuring the Switch through the Web Utility
QoS
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
IP Precedence/DSCP
This switch supports several common methods of prioritizing layer 3/4 traffic to meet application requirements.
Traffic priorities can be specified in the IP header of a frame, using the priority bits in the Type of Service (ToS)
octet or the number of the TCP port. If priority bits are used, the ToS octet may contain three bits for IP
Precedence or six bits for Differentiated Services Code Point (DSCP) service. When these services are enabled,
the priorities are mapped to a Class of Service value by the switch, and the traffic then sent to the corresponding
output queue. Because different priority information may be contained in the traffic, this switch maps priority
values to the output queues in the following manner:
The precedence for priority mapping is IP Port Priority, IP Precedence or DSCP Priority, and then Default Port
Priority.
IP Precedence and DSCP Priority cannot both be enabled. Enabling one of these priority types will automatically
disable the other.
The switch allows you to choose between using IP Precedence or DSCP priority. Select one of the methods or
disable this feature.
Disabled
. Disables both priority services. (This is the default setting.)
IP Precedence
. Maps layer 3/4 priorities using IP Precedence.
IP DSCP
. Maps layer 3/4 priorities using Differentiated Services Code Point Mapping.
Select Disabled, IP Precedence or IP DSCP from the drop-down menu.
Click
submit
to save the changes.
To select the configuration type, select IP Precedence or IP DSCP from the drop-down menu.
Click
config
to save the changes.
Figure 5-28: QoS - IP Precedence/DSCP
Page 55 / 104
47
Chapter 5: Configuring the Switch through the Web Utility
QoS
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
IP Port
You can also map network applications to Class of Service values based on the IP port number (i.e., TCP/UDP port
number) in the frame header. Some of the more common TCP service ports include: HTTP: 80, FTP: 21, Telnet: 23
and POP3: 110.
IP Port Priority Status
. Enables or disables the IP port priority.
IP Port Priority Table
. Shows the IP port to CoS map.
IP Port Number (TCP/UDP)
. Set a new IP port number, such as HTTP: 80, FTP: 21, Telnet: 23 and POP3: 110.
Class of Service Value
. Sets a CoS value for a new IP port. Note that “0” represents low priority and “7”
represent high priority.
Set IP Port Priority Status to Enabled by checking the IP Port Priority Global Status checkbox.
Enter the port number for a network application in the IP Port Number box and the new CoS value in the Class of
Service box.
Click
Submit
to save the changes.
To remove an IP Port Priority, select the priority to be removed from the table and click
Remove IP Port
.
Figure 5-29: QoS - IP Port

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