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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Types To Configure QoS for Outbound Traffic
2. You would then execute the following commands to prioritize the VLANs
by VID:
Figure 6-22. Configuring and Displaying QoS Priorities on VLANs
If you then decided to remove VLAN_20 from QoS prioritization:
Figure 6-23. Returning a QoS-Prioritized VLAN to “No-override” Status
Assigning a DSCP Policy Based on VLAN-ID (VID)
This option assigns a previously configured DSCP policy (codepoint and
802.1p priority) to outbound IP packets having the specified VLAN-ID (VID).
That is, the switch:
1. Selects an incoming IP packet on the basis of the VLAN-ID it carries.
2. Overwrites the packet’s DSCP with the DSCP configured in the switch for
such packets.
3. Assigns the 802.1p priority configured in the switch for the new DSCP.
(Refer to “Differentiated Services Codepoint (DSCP) Mapping” on page
6-58.)
4. Forwards the packet through the appropriate outbound port queue.
In this instance, No- override
indicates that VLAN 20 is not
prioritized by QoS.
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