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Configuring Switching
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SonicOS 5.7: Advanced Switching Feature Guide and Screencast Tutorial
Step 5 If both Trust CoS and Trust DSCP are selected, do one of the following:
• Select the Prefer CoS checkbox to give preference to the CoS 802.1p tag field settings when both the
802.1p tag field and the DSCP field are present in ingressing frames.
• Clear the Prefer CoS checkbox to give preference to the DSCP field settings when both the 802.1p tag
field and the DSCP field are present in ingressing frames.
Step 6 Select one of the following priority levels from the Default Priority drop-down list:
• Low
• Normal
• High
• Highest
If ingressing frames do not contain either a CoS 802.1p tag field or a DSCP field, the default priority is used.
Step 7 Click OK.
Configuring QoS Settings for Multiple Interfaces
To configure QoS settings for frames received on any of several interfaces, perform the following steps:
Step 1 On the Switching > Layer 2 QoS page under QoS Settings, select the checkboxes next to the interfaces you
want to configure, and then click the Configure button at the bottom of the page. The Edit QoS Settings
window opens.
Step 2 The Keep original QoS mode of each port checkbox is selected by default. When this checkbox is
selected, each individual port’s QoS mode remains unchanged, and only the Default Priority setting is
changed to the configured value (Step 7) for each port being configured.
To activate the other checkboxes in this window and make changes to the QoS settings of the selected
interfaces, clear the Keep original QoS mode of each port checkbox.
Step 3 To enable fixed priority for frames arriving on these interfaces, select the Fixed Priority checkbox. When
Fixed Priority is selected, the subsequent checkboxes are cleared and disabled (greyed out). The CoS 802.1p
tag field and DSCP field are ignored and the ingress port’s default priority is always used.
Step 4 To enable the use of the CoS 802.1p tag field settings for Quality of Service on these interfaces, select the
Trust CoS checkbox. The Fixed Priority checkbox must be cleared before you can select this checkbox.