Assigning a priority for a global layer 3 protocol classifier

This global QoS packet-marking option assigns an 802.1p priority to outbound packets having the specified Layer-3 protocol.

Syntax:


qos protocol [ip | ipx | arp | 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 on a tagged port, 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 | appletalk | sna | netbeui} priority 0 - 7

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.

Configuring global Layer-3 protocol classifiers

To configure the following global Layer-3 protocol classifiers:

  1. Configure QoS protocol classifiers with IP at 0 (normal), ARP at 5 (medium), and AppleTalk at 7 (high) and display the QoS protocol configuration.

  2. Disable the QoS IP protocol classifier, downgrade the ARP priority to 4, and again display the QoS protocol configuration.

The following example shows the necessary configuration commands.
Adding, Viewing, removing, and changing QoS protocol classifiers