Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers To Configure Quality of Service for Outbound Traffic

Options for Assigning Priority. Priority control options for packets from

aspecified source-port include: 802.1p priority

DSCP policy (Assigning a new DSCP and an associated 802.1p priority; inbound packets must be IPv4.)

(For operation when other QoS classifiers apply to the same traffic, refer to “Classifiers for Prioritizing Outbound Packets” on page 15-8.)

Assigning a Priority Based on Source-Port Only

This option assigns a priority to all outbound packets having the specified source-port. You can configure this option by either specifying the source-port ahead of the qos command or moving to the port context for the port you want to configure for priority. (If you are configuring multiple source-ports with the same priority, you may find it easier to use the port context instead of individually configuring the priority for each port.)

Syntax: interface [ e ] < port-list> qos priority < 0 - 7 >

Configures an 802.1p priority for outbound packets entering the switch through the specified (source) ports. This priority determines the packet queue in the outbound port(s) to which traffic from the source-ports is sent. If a packet leaves the switch in a tagged VLAN, it carries the 802.1p priority with it to the next downstream device. You can configure one QoS classifier for each source-port or group of source-ports. (Default: No- override)

no interface [ e ] < port-list> qos

Disables use of the specified source-port(s) for QoS classifier(s) and resets the priority for the specified source-port(s) to No-override.

show qos vlan-priority

Lists the QoS VLAN-ID classifiers with their priority data.

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