What is the general recommendation for configuring QoS on Catalyst 2900 XL and 3500 XL series switches?
A. The overall objective of QoS is to prioritize the voice/video traffic at the uplink port/router port so that those packets are not delayed. In order to achieve this objective, these guidelines are used: • Configure the PC ports as access ports. The default priority on a port is zero. If needed, you can explicitly configure the port by issuing the switchport priority default <0-3> command so that the traffic that comes from those ports are queued in a lower priority queue. • Configure ports which receive tagged low-priority traffic by issuing the switch priority override command and the switchport priority default <0-3> command so that this traffic is queued in a low priority queue. The override option is available only on WS-X3524-PWR-XL and WS-X3548-XL with Cisco IOS® Software Release 12.0(5)XU and later. • Configure the ports connected to Cisco IP phones for 802.1Q trunking so that the switch acts on the dot1q/p priority from the phones. As a result, the switch queues these packet
