KB.15.15

Example 152 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.

Figure 41 Adding, Viewing, removing, and changing QoS protocol classifiers

Assigning a priority for a global VLAN-ID classifier

This global QoS packet-marking option assigns a priority to all outbound packets having the

specified VLAN-ID (VID). You can configure this option by either specifying the VLAN-ID ahead of

the qos command or moving to the VLAN context for the VLAN you want to configure for priority.

Syntax:

vlan vid qos priority 0 - 7

Configures an 802.1p priority for outbound packets belonging to the specified

VLAN. 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 VLAN-ID.

Default: No-override

no vlan vid qos

Removes the specified VLAN-ID as a QoS classifier and resets the priority for that

VLAN to No-override.

show qos vlan-priority

Displays a listing of the QoS VLAN-ID classifiers currently in the running-config file,

with their priority data.

Assigning a priority for a global VLAN-ID classifier 209