Article ID:3163
Objectives
Class of Service (CoS) is a 3-bit field within an Ethernet frame header know as the Priority Code Point (PCP) when using a 802.1 network. This field specifies a priority value that is between 0 and 7 inclusive that can be used by Quality of Service (QoS) to differentiate packet traffic sent by the user. The values of the CoS from 0 to 3 have normal priority and values from 4-7 have higher priority. This article explains how to configure Class of Service settings on the ESW500 Series Switches.
Applicable Devices
• ESW500 Series Switches
Class of Service Configuration
Step 1. Use the Switch Configuration Utility to choose Quality of Service > General > CoS. The CoS page opens:
Step 2. Choose the mode of Quality of Service from the QoS Mode drop-down list.
• Disable — The QoS is disabled on the device.
• Basic — Enables the basic QoS settings on the device.
• Advanced — Enables advanced QoS settings on the device.
Step 3. Click either Ports or EtherChannels. The following information is displayed.
• Interface — The interface on which CoS is configured.
• Default CoS — The default CoS value for the packets that are received.
Step 4. (Optional) Check any Restore Defaults check box to restore the default setting of the desired interface.
Step 5. Click any Edit button to modify the desired interface. The Edit Interface Priority window appears:
Step 6. Click the Port or EtherChannel radio button and choose the port or EtherChannel for which the priority is to be defined from the drop-down list.
Step 8. Choose the default CoS value for the packets from the Set Default User Priority drop-down list. The packets with higher priority leave the port first to reach the destination while packets with lower priority leave the port after the higher priority packet queue is emptied. The default value is 0.
Step 9. Click Apply.
Step 10. Click Close to leave the window.