Quality of Service (QoS) Basic Mode Configuration on SFE / SGE Stackable Managed Switches

Objective

Quality of Service (QoS) is used to manage network traffic. In QoS basic mode all traffic receives the same treatment. QoS basic mode is used to define a domain in a network as a trusted domain. Packets are assigned Class of Service (CoS) or Differentiated Services Code Point (DSCP) tags to define the type of service they require. Nodes in the trusted domain use these tags to assign packets to a specific output queue.

This article explains how to configure QoS basic mode on the SFE / SGE Stackable Managed Switches.

Applicable Devices

• SFE / SGE Stackable Managed Switches

Software Version

• v3.0.2.0

QoS Basic Mode

Trust Mode

Step 1. Log in to the web configuration utility and choose Quality of Service > Basic Mode. The Basic Mode page opens:

Step 2. From the Trust Mode drop-down list choose the desired trust mode. If the CoS tag and DSCP tag of a packet are mapped to different queues, the trust mode decides which queue the packet is assigned to.

• CoS — The CoS mapping determines the packet queue. The CoS to queue mapping can be configured on the CoS to Queue page.

• DSCP — The DSCP mapping determines the packet queue. The DSCP to queue mapping can be configured on the DSCP to Queue page.

Step 3. If DSCP is chosen in the Trust Mode field, check Always Rewrite DSCP to rewrite the tag of a DSCP packet based on the QoS DSCP rewrite configuration.

Step 4. Click Apply.

Caution: This only saves your configuration to the running configuration file. This means any changes made will be lost if the device is rebooted. If you wish to save these changes even after a system reboot, you need to copy the running configuration file to the startup configuration file. See Copy Configuration File on SFE/SGE Series Managed Switches for more information on how to do this.

DSCP Rewrite Configuration

Step 1. Click DSCP Rewrite.

Step 2. Configure DSCP mapping.

• DSCP In — Displays the value of the incoming packet that needs to be remarked to an alternative value.

• DSCP Out — Choose the desired DSCP Out value for the corresponding DSCP In value from the DSCP Out drop-down list.

Step 3. Click Apply.

Caution: This only saves your configuration to the running configuration file. This means any changes made will be lost if the device is rebooted. If you wish to save these changes even after a system reboot, you need to copy the running configuration file to the startup configuration file. See Copy Configuration File on SFE/SGE Series Managed Switches for more information on how to do this.