Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers To Configure Quality of Service for Outbound Traffic

QoS LAN Protocol Priority

QoS Classifier Precedence: 4

The QoS protocol option enables you to use these protocols as QoS classifiers:

IP

ARP

Appletalk Netbeui

IPX DEC_LAT SNA

Options for Assigning Priority. Priority control for the LAN protocol clas­ sifier includes assigning only the 802.1p priority. The switch does not use this classifier for assigning DSCP-based priority.

Assigning a Priority Based on LAN Protocol

When QoS on the switch is configured with a LAN protocol as the highest- precedence classifier and the switch receives traffic carrying that protocol, then this traffic is assigned the priority configured for this classifier. (For operation when other QoS classifiers apply to the same traffic, refer to “Classifiers for Prioritizing Outbound Packets” on page 15-8.)

Syntax: qos protocol

< ip ipx arp dec_lat appletalk sna netbeui > priority < 0 - 7 >

Configures an 802.1p priority for outbound packets having the specified protocol. This priority determines the packet’s queue in the outbound port to which it is sent. If the 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 protocol type. (Default: No-override)

no qos protocol

< ip ipx arp dec_lat appletalk sna netbeui >

Disables use of the specified protocol as a QoS classifier and resets the protocol priority to No-override.

show qos protocol

Lists the QoS protocol classifiers with their priority settings.

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