QoS
Last updated
Last updated
There are two options for applying QoS information onto packets: the 802.1p Class of Service (CoS) priority field within the VLAN tag of tagged Ethernet frames, and Differentiated Services (DiffServ) Code Point (DSCP). Each port on the switch can be configured to trust one of the packet fields (802.1p , DSCP or DSCP+802.1p). Packets that enter the switch's port may carry no QoS information as well. If so, the switch places such information into the packets before transmitting them to the next node. Thus, QoS information is preserved between nodes within the network and the nodes know which label to give each packet. A trusted field must exist in the packet for the mapping table to be of any use. When a port is configured as untrusted, it does not trust any incoming packet priority designations and uses the port default priority value instead to process the packet.
Items
Descriptions
State
Select whether QoS is enabled or disabled on the switch.
Scheduling Method
Selects the Strict Priority or WRR to specify the traffic scheduling method.
Strict Priority: Specifies traffic scheduling based strictly on the queue priority.
WRR: Uses the Weighted Round-Robin (WRR) algorithm to handle packets in priority classes of service. It assigns WRR weights to queues.
Trust Mode
Select which packet fields to use for classifying packets entering the switch.
DSCP: Classify traffic based on the DSCP (Differentiated Services Code Point) tag value.
802.1p: Classify traffic based on the 802.1p. The eight priority tags that are specified in IEEE 802.1p are from 1 to 8.
Click Apply to update the system settings.
Use the Class of Service (CoS) Mapping feature to specify which internal traffic class to map to the corresponding CoS value. CoS allows you to specify which data packets have greater precedence when traffic is buffered due to congestion.
Items
Descriptions
CoS
Displays the CoS priority tag values, where 0 is the lowest and 7 is the highest
Queue
Check the CoS priority tag box and select the Queue values for each CoS value in the provided fields. Eight traffic priority queues are supported, and the field values are from 1 to 8, where one is the lowest priority and eight is the highest priority.
Click the Apply button 
Use Differentiated Services Code Point (DSCP) Mapping feature to specify which internal traffic class to map to the corresponding DSCP values. DSCP Mapping increases the number of definable priority levels by reallocating bits of an IP packet for prioritization purposes.
Items
Descriptions
DSCP
Displays the packet's DSCP values, where 0 is the lowest and 10 is the highest.
Queue
Check the CoS priority tag box and select the Queue values for each DSCP in the provided fields. Eight traffic priority queues are supported, and the field values are from 1 to 8, where one is the lowest priority and eight is the highest priority.
Click the Apply button
From here, you can configure the QoS port settings for the switch. Select a port you wish to set and choose a CoS value from the drop-down box. Next, select to enable or disable the Trust setting to let any CoS packet be marked at ingress.
Port
Displays the ports for which the CoS parameters are defined.
CoS Value
Select the CoS priority tag values, where 0 is the lowest and 7 is the highest.
Trust
Select Enabled to trust any CoS packet marking at ingress. Select Disabled to not trust any CoS packet marking at ingress.
Click the Apply button
The Bandwidth Control feature allows users to define the bandwidth settings for a specified port's Ingress Rate Limit and Egress Rate.
Items
Descriptions
Port
Displays the ports for which the bandwidth settings are displayed.
Ingress
Select enable or disable ingress on the interface.
Ingress Rate
Enter the ingress rate in kilobits per second. The gigabit Ethernet ports have a maximum speed of 1000000 kilobits per second.
Egress
Select from the drop-down box to Enable or Disable egress on the interface.
Egress Rate
Enter the egress rate in kilobits per second. The gigabit Ethernet ports have a maximum speed of 1000000 kilobits per second.
Storm Control limits the amount of Broadcast, Unknown Multicast, and Unknown Unicast frames accepted and forwarded by the switch. Storm Control can be enabled per port by defining the packet type and the rate that the packets are transmitted at. The switch measures the incoming Broadcast, Unknown Multicast, and Unknown Unicast frames rates separately on each port, and discards the frames when the rate exceeds a user-defined rate.
Items
Descriptions
Port
Displays the ports for which the Storm Control information is displayed.
Broadcast
Enter the broadcast rate in kilobits per second. The Gigabit Ethernet ports have a maximum speed of 1000000 kilobits per second. If the rate of broadcast traffic ingress on the interface increases beyond the configured threshold, the traffic is dropped.
Unknown Multicast
Enter the Unknown Multicast rate in kilobits per second. The gigabit Ethernet ports have a maximum speed of 1000000 kilobits per second. If the rate of broadcast traffic ingress on the interface increases beyond the configured threshold, the traffic is dropped.
Unknown Unicast
Enter the Unknown Unicast rate in kilobits per second. The gigabit Ethernet ports have a maximum speed of 1000000 kilobits per second. If the rate of broadcast traffic ingress on the interface increases beyond the configured threshold, the traffic is dropped.
Advanced mode allows users to further customize matching criteria to apply QoS onto incoming traffics; the switch then places such information into the packets before transmitting them to the next node.
Use this page to view and add class mapping for QoS.
Items
Descriptions
CLS Name
Enter the policy name of class for QoS mapping.
Status
Indicates the status for the class mapping policy.
Source MAC Address
Enter the source MAC address.
Source IP Address
Enter the source IP address.
Source IP Address Mask
Enter the mask of the source IP address.
Source Port
Enter the source port.
Destination MAC Address
Enter the destination MAC address.
Destination IP Address
Enter the destination IP address.
Destination IP Address Mask
Enter the mask of the destination IP address.
Destination Port
Enter the destination port.
Ethertype Value (Hex)
Enter the Ethertype value.
VLA ID
Select the VLAN ID from drop-down list.
VLAN Priority
Select the VLAN priority from drop-down list.
Protocol
Select protocol from list or ID.
DSCP
In Type of Service, enter the DSCP. The range is from 0 to 63.
Use this page to view and assign class mapping policy onto switch ports for QoS.
Policy Name
Displays the class mapping policy defined in Class Mapping.
Binding Ports
Enter the switch port number to bind the mapping policy for QoS.
Click the Apply button to accept the changes or the Cancel button to discard them.
Click the Apply button to accept the changes or the Cancel button to discard them.
In Action Type, select either "802.1p set to" or "DSCP set to" along with value specified in the corresponding field to apply QoS class mapping. Click the Apply button to accept the changes or the Cancel button to discard them.
Click the Apply button to accept the changes or the Cancel button to discard them.
