238Chapter 7: QoS Features Available on the Catalyst 4000 IOS Family of Switches and the Catalyst
queue as a high-priority queue forces the switch to service packets in transmit queue 3 first,
and thus reduces the chance of latency or jitter for VoIP traffic. All interfaces that connect
to other switches and Cisco IP Phone ports use transmit queue 3 as a high-priority queue.
Finally, the configuration consists of traffic shaping of transmit queues connected to an
edge router. The edge router only routes data traffic and therefore traffic-shaping works well
in this example. The edge router connects to an ATM cloud, which can service only about
3.0 ...
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