Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Types To Configure QoS for Outbound Traffic

QoS Interface (Source-Port) Priority

QoS Type Precedence: 2

The QoS Interface option enables you to use a packet’s source-port on the switch as a QoS type. Where a particular source-port type has the highest precedence in the switch for traffic entering through that port, then traffic received from the port is marked with the source-port type’s configured priority level.

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 types apply to the same traffic, refer to “QoS Types for Prioritizing Outbound Packets” on page 6-8.)

Assigning a Priority Based on Source-Port

This option assigns a priority to outbound packets having the specified source- port. 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. (For configuring multiple source-ports with the same priority, you may find it easier to use the interface < port-list> command to go to the port context instead of individually configuring the priority for each port.)

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

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

no interface < port-list> qos

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

override.

show qos port-priority

Lists the QoS port-priority types with their priority data.

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